LOAN AND SECURITY AGREEMENT

                          DATED AS OF NOVEMBER 17, 1997

                                     BETWEEN

                        SANWA BUSINESS CREDIT CORPORATION

                                    AS LENDER

                                       AND

                      NORTHERN GEOPHYSICAL OF AMERICA, INC.
                                   AS BORROWER





                           TABLE OF CONTENTS


                                                                                         PAGE
                                                                                          
1.  DEFINITIONS AND ACCOUNTING TERMS.........................................................1

    1.1      ................................................................"Account Debtor"1

    1.2      ......................................................................"Accounts"1

    1.3      ....................................................................."Affiliate"1

    1.4      .........................................................."Ancillary Agreements"1

    1.5      ...................................................."Average Daily Availability"2

    1.6      ....................................................................."Borrowing"2

    1.7      .................................................................."Business Day"2

    1.8      ...................................................................."Capex Loan"2

    1.9      ...................................................................."Capex Note"2

    1.10     .........................................................."Capital Expenditures"2

    1.11     ......................................................"Cash Flow Coverage Ratio"2

    1.12     ................................................................."Change of Law"2

    1.13     ......................................................................."Charges"2

    1.14     .................................................................."Closing Date"2

    1.15     ...................................................................."Collateral"2

    1.16     ......................................................."Collateral Availability"2

    1.17     ....................................................................."Companies"3

    1.18     ....................................................................."Computers"3

    1.19     ................................................................"Current Assets"3

    1.20     ..........................................................."Current Liabilities"3

    1.21     ......................................................."Daily Collateral Report"3

    1.22     ......................................................................."Default"3

    1.23     .................................................................."Default Rate"3

    1.24     ......................................................................."Dollars"3

    1.25     ..............................................................."Depository Bank"3

    1.26     ................................................................"Direct Charges"3

    1.27     ........................................................................"EBITDA"3

    1.28     ............................................................."Eligible Accounts"3






                           TABLE OF CONTENTS
                              (CONTINUED)
                                                                            PAGE

    1.29     ................................................................"Environmental Laws"4

    1.30     ........................................................................."Equipment"4

    1.31     ............................................................................."ERISA"4

    1.32     .................................................................."Event of Default"4

    1.33     ........................................................................"Financials"4

    1.34     .............................................................................."GAAP"4

    1.35     ..............................................................."General Intangibles"4

    1.36     ................................................................."Governmental Rule"4

    1.37     ........................................................................."Guarantor"4

    1.38     ..............................................................."Hazardous Materials"4

    1.39     ......................................................................"Indebtedness"4

    1.40     ......................................................................"Initial Term"5

    1.41     ......................................................."Interest Determination Date"5

    1.42     ..................................................................."Interest Period"5

    1.43     ........................................................................."Inventory"5

    1.44     ......................................................................."Liabilities"5

    1.45     ............................................................................."LIBOR"5

    1.46     ........................................................................"LIBOR Loan"6

    1.47     ....................................................................."LIBOR Portion"6

    1.48     .............................................................................."Lien"6

    1.49     ..................................................................."Loan" or "Loans"6

    1.50     ......................................................................"Loan Account"6

    1.51     ............................................................"Net Profit After Taxes"6

    1.52     ............................................................................."Notes"6

    1.53     ...................................................."Notice of Borrowing/Conversion"6

    1.54     ......................................................................."Overadvance"6

    1.55     ......................................................................."Participant"6

    1.56     ..................................................................."Permitted Liens"6

    1.57     ............................................................................"Person"7


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                           TABLE OF CONTENTS
                              (CONTINUED)
                                                                                               PAGE

    1.58     ............................................................................."Portion"7

    1.59     ......................................................................"Prepayment Fee"7

    1.60     .........................................................................."Prime Rate"7

    1.61     ....................................................................."Prime Rate Loan"7

    1.62     ........................................................................"Renewal Term"7

    1.63     ...................................................................."Reportable Event"7

    1.64     ......................................................................"Revolving Loan"7

    1.65     ............................................................"Revolving Loan Borrowing"7

    1.66     .................................................................."Security Documents"7

    1.67     .................................................................."Special Collateral"7

    1.68     ..............................................................................."Stock"7

    1.69     ..........................................................................."Subsidiary"8

    1.70     ..................................................................."Tangible Net Worth"8

    1.71     ............................................................................"Term Loan"8

    1.72     ............................................................................"Term Note"8

    1.73     .................................................................................."3-D"8

    1.74     ......................................................................."Total Facility"8

    1.75     ................................................................................."Type"8

2.  LOANS: GENERAL TERMS............................................................................8

    2.1      ........................................................................Total Facility.8

    2.2      ........................................Advances to Constitute One Loan; Loan Purpose.11

    2.3      ........................................................................Interest Rate.12

    2.4      ..............................................................Change of Circumstances.12

    2.5      .........................................................Funding Loss Indemnification.13

    2.6      ..........................................................................Prepayments.14

    2.7      ....................................Term of Agreement; Prepayment; Liquidated Damages.14

    2.8      ............................................................................Audit Fee.15

    2.9      ..........................................................................Closing Fee.15

    2.10     .....................................................................Unused Line Fee.15


                                      -iii-



                           TABLE OF CONTENTS
                              (CONTINUED)
                                                                                               PAGE

3.  ELIGIBLE ACCOUNTS; ELIGIBLE INVENTORY.........................................................16

    3.1      ...................................................................Eligible Accounts.16

4.  PAYMENTS......................................................................................17

    4.1      .............................................Loan Account; Method of Making Payments.17

    4.2      .......................................................................Payment Terms.17

    4.3      .................................................Collection of Accounts and Payments.18

    4.4      .............................................Application of Payments and Collections.18

    4.5      ..........................................................................Statements.19

5.  COLLATERAL: GENERAL TERMS.....................................................................19

    5.1      ...................................................................Security Interest.19

    5.2      .....................................................Disclosure of Security Interest.19

    5.3      ..................................................................Special Collateral.19

    5.4      ..................................................................Further Assurances.19

    5.5      ..........................................................................Inspection.20

    5.6      .....................................Perfection and Priority; Location of Collateral.20

    5.7      ..............................Lender's Payment of Claims Asserted Against Collateral.20

6.  COLLATERAL: ACCOUNTS..........................................................................21

    6.1      ............................................................Verification of Accounts.21

    6.2      ....................................Assignments, Records and Daily Collateral Report.21

    6.3      ..................................................Notice Regarding Disputed Accounts.21

    6.4      .....................................................Sale or Encumbrance of Accounts.21

7.  COLLATERAL:  INVENTORY........................................................................21

8.  COLLATERAL: EQUIPMENT.........................................................................21

    8.1      ........................................................Maintenance of the Equipment.21

    8.2      ..................................................Evidence of Ownership of Equipment.21

    8.3      ...........................................................Proceeds of the Equipment.21

    8.4      ...............................................................Location of Equipment.22

9.  WARRANTIES AND REPRESENTATIONS................................................................22

    9.1      ..............................................General Warranties and Representations.22


                                 -iv-




                                TABLE OF CONTENTS
                                   (CONTINUED)
                                                                           PAGE

    9.2      ..............................................Account Warranties and Representations.25

    9.3      ............................................Inventory Warranties and Representations.26

    9.4      ..........................Automatic Warranty and Representation and Reaffirmation of

             Warranties and Representations.......................................................26

    9.5      ..........................................Survival of Warranties and Representations.26

10. COVENANTS AND CONTINUING AGREEMENTS...........................................................27

    10.1     ...............................................................Affirmative Covenants.27

    10.2     ..................................................................Negative Covenants.29

    10.3     ..................................................................Contesting Charges.31

    10.4     ..................................................................Payment of Charges.31

    10.5     ......................................................Insurance; Payment of Premiums.31

    10.6     ...............................Survival of Obligations Upon Termination of Agreement.32

    10.7     .............................................................Environmental Indemnity.32

    10.8     ...................................................................Change of Control.32

    10.9     ................................................................Revisions or Updates.32

11. CONDITIONS PRECEDENT TO CLOSING...............................................................33

12. DEFAULT; RIGHTS AND REMEDIES ON DEFAULT.......................................................35

    12.1     .............................................................................Default.35

    12.2     .....................................................Acceleration of the Liabilities.37

    12.3     .........................................................Advances During Cure Period.37

    12.4     ........................................................................Default Rate.37

    12.5     ............................................................................Remedies.37

    12.6     ..............................................................................Notice.38

13. MISCELLANEOUS.................................................................................38

    13.1     .........................Appointment of Lender as Borrower's Lawful Attorney-In-Fact.38

    13.2     ...........................Modification of Agreement; Assignment or Sale of Interest.39

    13.3     .......................Attorneys' Fees and Expenses; Lender's Out-of-Pocket Expenses.39

    13.4     ....................................................................Waiver by Lender.40

    13.5     ........................................................................Severability.40


                                     -v-



    13.6     ...........................................................Parties; Entire Agreement.40

    13.7     ...................................................................Conflict of Terms.41

    13.8     ..................................................................Waiver by Borrower.41

    13.9     ................................................................Governing Law, Venue.41

    13.10    ..............................................................................Notice.42

    13.11    .................................................................Section Titles, Etc.42

    13.12    ...................................................................Course of Dealing.42

    13.13    ..............................................................................Setoff.43

    13.14    ..............................................................Nonliability of Lender.43

    13.15    .................................................................Time of the Essence.43

    13.16    .....................................................................Indemnification.43

    13.17    ....................................................Waiver of Right to Trial by Jury.44



                                LIST OF EXHIBITS

Exhibit A           Financials
Exhibit B           Form of Notice of Borrowing/Conversion
Exhibit C           Locations
Exhibit D           Tradenames
Exhibit E           Litigation
Exhibit F           Title to Assets, Liens
Exhibit G           Affiliates and Subsidiaries
Exhibit H           Covenant Compliance Certificate
Exhibit I           Form of Daily Collateral Report
Exhibit J           Existing Indebtedness for Borrowed Money

Schedule 1.29       Equipment
Schedule 10.1(a)    Financial Covenants
Schedule 10.2       Deposit Accounts


                                       -i-



                           LOAN AND SECURITY AGREEMENT


                  THIS LOAN AND SECURITY  AGREEMENT  ("Agreement") is made as of
the  17th  day  of  November,   1997,  by  and  between  Sanwa  Business  Credit
Corporation,  a Delaware  corporation  ("Lender"),  and Northern  Geophysical of
America, Inc., a Delaware corporation ("Borrower").

                              W I T N E S S E T H:

                  WHEREAS,  Borrower  desires to borrow  funds and obtain  other
financial  accommodations  from  Lender,  and Lender is willing to make  certain
loans and provide other financial  accommodations to Borrower upon the terms and
subject to the conditions set forth herein;

                  NOW THEREFORE,  in  consideration  of the terms and conditions
contained herein, and of any loans or other financial accommodations heretofore,
now or hereafter made to, or for the benefit of, Borrower by Lender, the parties
hereto agree as follows:

1.       DEFINITIONS AND ACCOUNTING TERMS

         A. Specific Defined Terms. When used herein,  the following terms shall
have the following respective meanings:

         1.1  "ACCOUNT  DEBTOR"  shall  mean any Person who is or who may become
obligated to Borrower under, with respect to, or on account of an Account.

         1.2  "ACCOUNTS"  shall mean and  include  all of  Borrower's  presently
existing and hereafter arising or acquired  accounts,  receivables and rights of
Borrower  to  payment  for  goods  sold  or  leased  or for  services  rendered,
including,  without limitation,  those which are not evidenced by instruments or
chattel paper, and whether or not they have been earned by performance; proceeds
of any  letters of credit on which  Borrower is named as  beneficiary;  contract
rights; chattel paper; instruments;  documents; insurance proceeds; and all such
obligations whatsoever owing to Borrower,  together with all instruments and all
documents  of  title  representing  any  of the  foregoing,  all  rights  in any
merchandise or goods which any of the same may represent,  and all right, title,
security  and  guaranties  with  respect  to each of the  foregoing,  including,
without limitation, any right of stoppage in transit.

         1.3  "AFFILIATE"  shall mean any and all  Subsidiaries  and any and all
Persons which, in the reasonable judgment of Lender, directly or indirectly, own
or control, are controlled by or are under common control with Borrower, and any
and all Persons from whom, in the  reasonable  judgment of Lender,  Borrower has
not or is not likely to exhibit  independence  of  decision  or action.  For the
purpose  of  this  definition,  "control"  means  the  possession,  directly  or
indirectly,  of the power to direct or cause the  direction  of  management  and
policies of a Person,  whether  through the ownership of voting  securities,  by
contract or otherwise.

         1.4 "ANCILLARY  AGREEMENTS"  shall mean all Security  Documents and all
agreements,  instruments and documents,  including  without  limitation,  notes,
guaranties,


                                        1




mortgages, deeds of trust, chattel mortgages,  pledges, negative pledges, powers
of attorney,  consents,  assignments,  contracts,  notices, security agreements,
intellectual  property  security  agreements,   leases,   financing  statements,
subordination agreements,  trust account agreements and all other written matter
whether  heretofore,  now, or hereafter  executed by or on behalf of Borrower or
any other Person or delivered to Lender or any Participant  with respect to this
Agreement.

         1.5 "AVERAGE DAILY  AVAILABILITY"  shall mean for any period the sum of
Collateral  Availability for each Business Day during such period divided by the
number of Business Days in such period.

         1.6 "BORROWING" shall mean a borrowing by Borrower consisting of a Loan
made by Lender on the same date and of the same Type pursuant to a single Notice
of Borrowing/Conversion.
         1.7 "BUSINESS DAY" shall mean (a) any day on which commercial banks are
not authorized to close or not required to close in Los Angeles,  California and
(b) if such Business Day is related to a Loan which bears or is to bear interest
based on LIBOR,  any day in which dealings in Dollar deposits may be carried out
in the London interbank market.
         1.8 "CAPEX  LOAN" shall have the meaning  given to that term in Section
2.1(c).
         1.9 "CAPEX  NOTE" shall have the meaning  given to that term in Section
2.1(c).
         1.10  "CAPITAL  EXPENDITURES"  shall  mean  all  expenditures  made and
liabilities  incurred  for the  acquisition  of any fixed asset or  improvement,
replacement,  substitution or addition thereto,  which has a useful life of more
than one year and  including,  without  limitation,  those arising in connection
with capital leases.
         1.11 "CASH FLOW COVERAGE RATIO" shall mean for any period, the quotient
of (x) EBITDA  minus the sum of (A) all taxes paid during such  period,  (B) all
Capital  Expenditures  permitted hereunder and actually made, except any portion
thereof financed through Indebtedness permitted hereunder, and (C) all dividends
actually paid during such period,  divided by (y) the sum of (A) all  principal,
interest  and other  payments  made or required to be made by the  Companies  on
Indebtedness  during such  period,  including  any fees and charges  owed by the
Companies in connection with any such Indebtedness and (B) all capitalized lease
payments made or required to be made by the Companies during such period.
         1.12  "CHANGE  OF LAW"  shall  have the  meaning  specified  in Section
2.4(b).
         1.13 "CHARGES" shall mean all national,  federal,  state, county, city,
municipal,  or other governmental taxes, levies,  assessments,  charges,  liens,
claims or  encumbrances  (including,  without  limitation,  those of the Pension
Benefit Guaranty  Corporation) upon or relating to (i) the Collateral,  (ii) the
Liabilities, (iii) Borrower's employees, payroll, income or gross receipts, (iv)
Borrower's  ownership  or use of any of its assets,  or (v) any other  aspect of
Borrower's business.
         1.14 "CLOSING DATE" shall mean the date on which each of the conditions
precedent in Section 11 are satisfied and the initial Loans are made.
         1.15  "COLLATERAL"  shall mean all of the  property  and  interests  in
property  described  in Section  5.1 and all other  property  and  interests  in
property  which  shall,  from  time  to  time,  secure  all or any  part  of the
Liabilities.
         1.16 "COLLATERAL AVAILABILITY" shall have the meaning ascribed to it in
Section 2.1(a).


                                        2




         1.17  "COMPANIES"  shall  mean,   collectively,   Borrower;   3-D;  3-D
Geophysical of Latin America, Inc., a Cayman Island company; J.R.S.  Exploration
Company,  Ltd., a Canada  corporation;  Geoevaluaciones,  S.A. de C.V., a Mexico
company; and Procesos Interactivos Avanzados, S.A. de C.V., a Mexico company.
         1.18  "COMPUTERS"  shall  mean  all  of  Borrower's  right,  title  and
interest,  now owned and hereafter acquired, in computer equipment and hardware,
including,  without limitation,  all central processing units,  terminals,  disk
drives,  tape drives,  electronic memory units,  printers,  keyboards,  screens,
peripherals (and other  input/output  devices),  modems and other  communication
controllers,  and any and  all  accessions,  parts  and  appurtenances  thereto,
substitutions therefore and replacements thereof, all intellectual property used
by Borrower,  at any time, in the operation of such computer equipment hardware,
including,  without limitation, all software, all of Borrower's rights under any
licenses related to Borrower's software or hardware,  and all leases pursuant to
which Borrower leases any computer equipment, hardware or software.
         1.19  "CURRENT  ASSETS"  shall mean the aggregate net book value of the
current assets of Borrower as determined in accordance with GAAP,  excluding any
Accounts owing to Borrower from any Affiliate.
         1.20  "CURRENT  LIABILITIES"  shall  mean the  aggregate  amount of all
liabilities of Borrower which would be classified as current  liabilities  under
GAAP.
         1.21 "DAILY  COLLATERAL  REPORT" shall mean a borrowing  base report in
the form of Exhibit I hereto  delivered  to Lender by  Borrower,  as required by
Section 6.2,  consisting of sales,  collections and an aged trial balance of all
of the  Accounts  existing  as of the  date of  such  Daily  Collateral  Report,
specifying  for each  Account  Debtor  obligated on the  Accounts,  such Account
Debtor's name, address and outstanding balance and the aging of such outstanding
balance;  inventory valuations as set forth in the most recent Inventory Report,
and such other information as may, from time to time, be required by Lender.
         1.22  "DEFAULT"  shall mean the  occurrence  or existence of any one or
more of the events described in Section 12.1.
         1.23  "DEFAULT  RATE" shall have the meaning  ascribed to it in Section
12.4.
         1.24 "DOLLARS" shall mean U.S. dollars.
         1.25  "DEPOSITORY  BANK"  shall mean the banking  institution  which is
referred to in Section 4.3.

         1.26 "DIRECT  CHARGES" shall mean accounts  arising from work performed
by subcontractors or other third parties and billed by Borrower.
         1.27  "EBITDA"  shall  mean,  for any  period,  the net income for such
period  of 3-D  determined  on a  consolidated  basis in  accordance  with  GAAP
(excluding any extraordinary income items, including,  without limitation,  gain
on sale of assets, income relating to foreign exchange, swap or other derivative
transactions  and  changes in GAAP),  plus the  following  items,  to the extent
deducted from the revenues of 3-D in the  calculation of net income or loss: (i)
depreciation,  (ii)  amortization  of intangibles  and any other non-cash items,
(iii) cash interest expense  (excluding any interest  paid-in-kind) and (iv) tax
expense.
         1.28 "ELIGIBLE  ACCOUNTS" shall mean those Accounts (including Accounts
of J.R.S. Exploration Company, Ltd., Geoevaluaciones, S.A. de C.V., and Procesos
Interactivos,  S.A.  de C.V.,  to the extent  provided  in Section  3.1  hereof)
included  in a Daily  Collateral  Report  which,  as of the  date of such  Daily
Collateral Report and at all times thereafter,  (i) satisfy the requirements for
eligibility  as  described in Section  3.1,  (ii) do not violate the  covenants,
representations  and warranties and other provisions of this Agreement and (iii)
Lender, in its reasonable credit judgment, deems to be Eligible Accounts.


                                        3




         1.29  "ENVIRONMENTAL  LAWS" shall mean the  Resource  Conservation  and
Recovery Act of 1987, the Comprehensive Environmental Response, Compensation and
Liability  Act,  any  so-called   "Superfund"  or  "Superlien"  law,  the  Toxic
Substances  Control  Act,  or any other  federal  state or local  statute,  law,
ordinance, code, rule, regulation,  order or decree regulating,  relating to, or
imposing liability or standards of conduct concerning,  any hazardous,  toxic or
dangerous  waste,  substance  or  material,  as now or at any time  hereafter in
effect.
         1.30  "EQUIPMENT"  shall mean all of Borrower's now owned and hereafter
acquired  equipment  and  fixtures,  including  without  limitation,  furniture,
machinery,  tools,  vehicles  and  trade  fixtures,  together  with  any and all
accessories,   parts  and  appurtenances  thereto,  substitutions  therefor  and
replacements  thereof,  including  without  limitation  the Equipment  listed in
Schedule 1.30 hereto.
         1.31 "ERISA" shall mean the Employee  Retirement Income Security Act of
1974, as amended.
         1.32 "EVENT OF DEFAULT" shall mean any event or condition  which,  with
the passage of time or the giving of notice or both, would constitute a Default.
         1.33  "FINANCIALS"  shall mean  those  consolidated  and  consolidating
financial  statements  of 3-D  attached  hereto as Exhibit "A" or  delivered  to
Lender pursuant to Section 10.1(e).
         1.34  "GAAP"  shall  mean  generally  accepted  accounting  principles,
consistently applied.
         1.35  "GENERAL  INTANGIBLES"  shall mean all choses in action,  general
intangibles,  causes of action and all other  intangible  personal  property  of
Borrower of every kind and nature  (other than  Accounts) now owned or hereafter
acquired  by  Borrower.  Without  in any  way  limiting  the  generality  of the
foregoing,  General Intangibles  specifically include,  without limitation,  all
corporate or other business  records,  security  deposits,  prepaid deposits and
expenses,  inventions,   designs,  patents,  patent  applications,   trademarks,
trademark  applications,  trade  names,  trade  secrets,  goodwill,  copyrights,
registrations,  licenses,  franchises,  tax refunds and tax refund  claims,  all
rights and claims against carriers and shippers,  all rights to indemnification,
and all  letters  of  credit,  guarantee  claims,  security  interests  or other
security held by or granted to Borrower to secure  payment by an Account  Debtor
of any Accounts.
         1.36 "GOVERNMENTAL  RULE" shall mean any applicable law or governmental
rule,  regulation  or order (or any  interpretation  thereof,  and including the
introduction of any new law or governmental rule, regulation or order).
         1.37  "GUARANTOR"  shall mean the Persons  described in Section 10.1(k)
and any other Person who after the date hereof guaranties all or any part of the
Liabilities.
         1.38  "HAZARDOUS  MATERIALS"  shall  mean any  hazardous  substance  or
pollutant  or  contaminant  defined  as such in (or  for  the  purposes  of) any
Environmental  Law and shall  include,  but not be limited  to,  petroleum,  any
radioactive material, and asbestos in any form or condition.
         1.39   "INDEBTEDNESS"   shall  mean  all  of  Borrower's   liabilities,
obligations  and  indebtedness  to any Person of any and every kind and  nature,
whether primary, secondary,  direct, indirect, absolute,  contingent,  fixed, or
otherwise,   heretofore,  now  or  hereafter  owing,  due  or  payable,  however
evidenced,  created,  incurred,  acquired or owing and however arising,  whether
under written or oral agreement,  by operation of law, or otherwise.  Without in
any way limiting the  generality  of the  foregoing,  Indebtedness  specifically
includes (i) the Liabilities,  (ii) all obligations or liabilities of any Person
that are secured by


                                        4




any lien,  claim,  encumbrance  or  security  interest  upon  property  owned by
Borrower,  even though Borrower has not assumed or become liable for the payment
thereof, (iii) all obligations or liabilities created or arising under any lease
of real or personal  property,  or  conditional  sale or other  title  retention
agreement with respect to property used or acquired by Borrower, even though the
rights and remedies of the lessor,  seller or lender  thereunder  are limited to
repossession of such property,  (iv) all unfunded  pension fund  obligations and
liabilities and (v) deferred taxes.
         1.40  "INITIAL  TERM" shall have the meaning  ascribed to it in Section
2.7.
         1.41 "INTEREST  DETERMINATION  DATE" shall have the meaning ascribed to
it in Section 1.45.
         1.42  "INTEREST  PERIOD"  shall mean with  respect to any LIBOR Loan or
LIBOR Portion,  the time period selected by Borrower  pursuant to Section 2.1(i)
which,  in each case,  commences on the first day of such Loan or Portion or the
effective  date of any  conversion and ends on the last day of such time period,
and thereafter,  each  subsequent  time period selected by Borrower  pursuant to
Section 2.1(i) which commences on the last day of the immediately preceding time
period and ends on the last day of that time period.
         1.43 "INVENTORY" shall mean all goods, inventory, merchandise and other
personal property,  including,  without limitation,  goods in transit,  wherever
located and whether now owned or hereafter  acquired by Borrower which is or may
at any time be held for sale or lease,  furnished  under any contract of service
or held as raw  materials,  work  in  process,  supplies  or  materials  used or
consumed in Borrower's  business or are or might be used in connection  with the
manufacturing,  shipping,  advertising  or selling or  finishing  of such goods,
merchandise and other personal  property and all documents of title or documents
representing  the same,  and all such property the sale or other  disposition of
which has given rise to Accounts and which has been  returned to or  repossessed
or stopped in transit by Borrower.
         1.44   "LIABILITIES"   shall  mean  all  of   Borrower's   liabilities,
obligations and indebtedness to Lender of any and every kind and nature, whether
primary,   secondary,   direct,  absolute,   contingent,   fixed,  or  otherwise
(including,  without  limitation,  the Revolving  Loan, the Term Loan, any Capex
Loans or other accommodations,  interest, charges, expenses, attorneys' fees and
other sums chargeable to Borrower by Lender,  future advances made to or for the
benefit of Borrower and obligations of performance),  whether arising under this
Agreement,  under any other  Ancillary  Agreement or acquired by Lender from any
other source,  whether  heretofore,  now or hereafter  owing,  arising,  due, or
payable from Borrower to Lender, however evidenced,  created, incurred, acquired
or owing and however arising, whether under written or oral agreement, operation
of law, or otherwise.
         1.45 "LIBOR" shall mean the London  Interbank  Offered Rate.  The LIBOR
Rate shall be determined as of each Interest  Determination Date, which shall be
that date which  corresponds  to the initial  transaction  effective date and to
each subsequent  interest reset for the Interest Period.  LIBOR, with respect to
any Interest Determination Date, shall be determined as follows:
                           (i) As of the initial transaction effective date, the
         offered  rate for  deposits in Dollars for the  Interest  Period  which
         appears on Telerate Page 3750 at approximately 11:00 A.M., London time,
         on such Interest  Determination  Date.  "Telerate Page 3750" shall mean
         the  display   designated   as  Page  3750  on  the  Telerate   Systems
         Incorporated  financial  information  reporting  service (or such other
         page as may  replace  page  3750 on the  service  for  the  purpose  of
         displaying  London interbank  offered rates as published by the British
         Bankers' Association).


                                        5




                           (ii) If no offered rate appears on the Telerate  Page
         3750,  the principal  London offices of each of four major banks in the
         London  interbank  market will be selected by Lender to provide  Lender
         with its offered  quotations  for  deposits in Dollars for the Interest
         Period to prime banks in the London  interbank  market at approximately
         11:00 A.M.  London time on such  Interest  Determination  Date and in a
         principal amount equal to an amount of not less than $1 million that is
         representative of a single  transaction in such market at such time. If
         at least two such quotations are provided, LIBOR will be the arithmetic
         mean of such  quotations.  If fewer than two  quotations  are provided,
         LIBOR  in  respect  of such  Interest  Determination  Date  will be the
         arithmetic mean of the offered rates quoted by three major money center
         banks in the City of New York selected by Lender at approximately 11:00
         A.M., New York City time, on such Interest Determination Date for loans
         in Dollars to leading European banks, for such Interest Period and in a
         principal amount of not less than $1 million that is  representative of
         a single  transaction in such market at such time;  provided,  however,
         that if fewer than three  banks  selected  as  aforesaid  by Lender are
         quoting rates as set forth above,  LIBOR for such Interest  Period will
         be the same as LIBOR for the immediately preceding Interest Period (or,
         if there was no such Interest  Period,  the rate of interest payable on
         the  LIBOR  Loans  for  which  LIBOR is being  determined  shall be the
         initial  interest  rate).  1.46  "LIBOR  LOAN"  shall  mean any Loan or
         Portion which bears interest at a rate
per annum based upon LIBOR.
         1.47  "LIBOR  PORTION"  shall mean (i) with  respect  to the  Revolving
Loans,  the  Portion of the  Revolving  Loans  which  bears  interest  at a rate
determined  by reference to LIBOR as provided in Section  2.1(e)(ii),  (ii) with
respect to the Term Loan, the Portion of the Term Loan which bears interest at a
rate  determined  by reference to LIBOR as provided in Section  2.1(f)(ii),  and
(iii) with respect to the Capex Loan,  the Portion of the Capex Loan which bears
interest  at a rate  determined  by  reference  to LIBOR as  provided in Section
2.1(g)(ii).
         1.48 "LIEN" means any mortgage,  deed of trust, pledge,  hypothecation,
security interest,  encumbrance, lien or charge, whether arising by operation of
law or otherwise.
         1.49 "LOAN" OR "LOANS" shall mean any or all of the advances to be made
by Lender pursuant to this Agreement.
         1.50 "LOAN  ACCOUNT"  shall have the meaning  ascribed to it in Section
4.1.
         1.51 "NET PROFIT  AFTER TAXES" shall mean net income for such period of
Borrower determined in accordance with generally accepted accounting  principles
("GAAP"),  consistently  applied (excluding any extraordinary  items,  including
without  limitation  income or expenses  related to foreign  exchange,  swaps or
other derivative transactions and changes in GAAP).
         1.52  "NOTES"  shall  mean,  collectively,  the Term Note and the Capex
Notes.
         1.53 "NOTICE OF  BORROWING/CONVERSION"  shall have the meaning given to
that term in Section 2.1(d).
         1.54 "OVERADVANCE" shall have the meaning given to that term in Section
2.6(b).
         1.55  "PARTICIPANT"  shall mean any Person, now or at any time or times
hereafter,   participating   with  Lender  in  the  Loans  or  other   financial
accommodations  made by Lender to Borrower  pursuant to this  Agreement  and the
Ancillary Agreements.
         1.56     "PERMITTED LIENS" shall mean the following:
                           (i)  Any  Liens  existing  on the  Closing  Date  and
         disclosed in Exhibit "F" or arising  under this  Agreement or the other
         Ancillary Documents;


                                        6




                           (ii)  Liens for  taxes,  fees,  assessments  or other
         governmental charges or levies on real property,  either not delinquent
         or being  contested in good faith by  appropriate  proceedings  and for
         which adequate reserves have been established;
                           (iii) Liens upon or in any Equipment acquired or held
         by  Borrower  to  secure  the  purchase  price  of  such  Equipment  or
         indebtedness   incurred   solely  for  the  purpose  of  financing  the
         acquisition of such Equipment in the original  principal  amount not to
         exceed One Million  Five  Hundred  Thousand  Dollars  ($1,500,000)  per
         fiscal year of Borrower. 
         1.57  "PERSON"  shall  mean  any   individual,   sole   proprietorship,
partnership, limited liability partnership, joint venture, trust, unincorporated
organization,  association, corporation, limited liability company, institution,
entity,  party, or government (whether national,  federal,  state, county, city,
municipal or otherwise,  including,  without  limitation,  any  instrumentality,
division, agency, body or department thereof).
         1.58 "PORTION" shall mean an amount of any Revolving Loan, Term Loan or
Capex Loan which is less than the entire  outstanding  principal balance of such
Revolving Loan, Term Loan or Capex Loan.
         1.59  "PREPAYMENT FEE" shall have the meaning ascribed to it in Section
2.7.
         1.60 "PRIME RATE" shall mean the highest prime rate of interest quoted,
from time to time,  by The Wall  Street  Journal as the "base rate on  corporate
loans at large U.S. money center commercial banks";  provided,  however, that if
The Wall Street Journal ceases quoting a prime rate of the type described, Prime
Rate shall mean the highest per annum rate of interest quoted as the "Bank Prime
Loan" rate for "This Week" in Statistical Release H.15 (519) published from time
to time by the Board of  Governors  of the  Federal  Reserve  System;  provided,
further,  that in the  event  that  both of the  aforesaid  indices  cease to be
published or to quote rates of the  aforesaid  types,  the "Prime Rate" shall be
determined  from a comparable  index  chosen by Lender in good faith.  The Prime
Rate shall change  effective on the date of the publication of any change in the
applicable index by which such "Prime Rate" is determined.
         1.61  "PRIME  RATE LOAN" shall mean any Loan or any Portion of any Loan
which bears interest at a rate per annum based upon the Prime Rate.
         1.62  "RENEWAL  TERM" shall have the meaning  ascribed to it in Section
2.7.
         1.63  "REPORTABLE  EVENT"  shall  have the  meaning  ascribed  to it in
Section 9.1(n).
         1.64 "REVOLVING  LOAN" shall have the meaning ascribed to it in Section
2.1(a).
         1.65  "REVOLVING  LOAN  BORROWING"  shall mean a borrowing  by Borrower
consisting  of a Revolving  Loan made by Lender on the same date and of the same
Type pursuant to a single Notice of Revolving  Loan  Borrowing.  1.66  "SECURITY
DOCUMENTS"  shall  mean  this  Agreement  and  all  other  agreements,  security
agreements,  instruments,  documents, financing statements,  warehouse receipts,
bills of lading, notices of assignment,  schedules, assignments, deeds of trust,
Ancillary Agreements,  mortgages and other written matter necessary or requested
by Lender to create, perfect and maintain perfected,  Lender's security interest
in the Collateral.  1.67 "SPECIAL COLLATERAL" shall have the meaning ascribed to
it in Section  5.3.  1.68  "STOCK"  shall mean all shares,  options,  interests,
membership  interests,  participations or other equivalents (however designated)
of  or  in a  corporation  or  limited  liability  company,  whether  voting  or
non-voting,  including, without limitation,  common stock, warrants,  membership
interests,   preferred  stock,   convertible   debentures  and  all  agreements,
instruments and documents convertible, in whole or in part, into any one or more
or all of the foregoing.


                                        7




         1.69  "SUBSIDIARY"  shall mean,  with respect to Borrower,  each of the
Persons  identified as a "Subsidiary"  on Exhibit "G" hereto,  and any Person of
which Borrower  acquires,  after the date hereof,  50% or more of the issued and
outstanding voting stock.
         1.70  "TANGIBLE NET WORTH" shall mean, as of any  particular  date, the
difference between (a) 3-D's consolidated total assets as they would normally be
shown on the balance sheet of 3-D, but excluding  therefrom the aggregate amount
of all  3-D's  intangible  assets,  including  but  not  limited  to all  values
attributable to goodwill,  patents,  copyrights,  trademarks,  licenses, prepaid
deposits and expenses, leasehold improvements net of depreciation, other General
Intangibles  and Accounts due from Affiliates and other  intangibles  reasonably
determined by Lender and (b) 3-D's  consolidated  total liabilities and deferred
charges  as they would  usually be shown on such  balance  sheet,  including  as
liabilities  (without   duplication)  all  guarantees  of  the  indebtedness  of
Affiliates or any other Person.
         1.71 "TERM  LOAN"  shall  have the  meaning  ascribed  to it in Section
2.1(b).
         1.72 "TERM  NOTE"  shall  have the  meaning  ascribed  to it in Section
2.1(b).
         1.73 "3-D" means 3-D Geophysical, Inc., a Delaware corporation.
         1.74 "TOTAL  FACILITY" shall have the meaning ascribed to it in Section
2.1.
         1.75 "TYPE" shall mean, with respect to any Loan,  Borrowing or Portion
at any time, the  classification of such Loan,  Borrowing or Portion by the type
of interest rate it then bears, whether an interest rate based on the Prime Rate
or LIBOR.
         B. Accounting  Terms. Any accounting terms used in this Agreement which
are not specifically  defined shall have the meanings  customarily given them in
accordance with GAAP.
         C. Other Terms.  All other terms  contained in this Agreement which are
not otherwise  defined in this  Agreement  shall,  unless the context  indicates
otherwise,  have the meanings provided for by the Uniform Commercial Code of the
State of California to the extent the same are used or defined therein.
2.       LOANS: GENERAL TERMS
         2.1 TOTAL FACILITY.  Lender agrees to make available for Borrower's use
from time to time during the term of this  Agreement,  upon  Borrower's  request
therefor,  certain  Loans and other  financial  accommodations  in an  aggregate
principal amount outstanding not to exceed Thirty Million Dollars  ($30,000,000)
(the "Total Facility").  The Total Facility shall be subject to all of the terms
and conditions of this Agreement and shall consist of:
                  (A) Revolving  Loan. A revolving line of credit  consisting of
         advances  against  Eligible  Accounts  (the  "Revolving  Loan")  in  an
         aggregate principal amount not to exceed, at any time outstanding,  the
         lesser  of  (i)  Ten  Million  Dollars   ($10,000,000)   and  (ii)  the
         outstanding  amount  of  Collateral  Availability.   As  used  in  this
         Agreement,  "Collateral Availability" shall mean and, at any particular
         time and from time to time, be equal to, up to eighty  percent (80%) of
         the net  amount  (after  deduction  of such  reserves  as Lender in its
         reasonable  credit  judgment  deems proper and  necessary)  of Eligible
         Accounts.  The Revolving Loan shall be repayable as provided in Section
         4.2.
                  Lender shall have the right to establish reserves from time to
         time against  borrowing  availability  under the Revolving Loan in such
         amounts,  and with  respect  to such  matters,  as  Lender  shall  deem
         reasonably necessary or appropriate,  including,  without limitation, a
         $2,000,000   reserve   (which  amount  may  be  increased  in  Lender's
         reasonable  business judgment) with respect to the lawsuit described in
         Section  11(y)  below.  Lender may, in the  exercise of its  reasonable
         discretion, at any time and from


                                        8




         time to time, increase or decrease the advance percentage  contained in
         this  Section  to be applied to  Eligible  Accounts.  In the event such
         percentage is decreased,  such decrease shall become effective upon not
         less than ten (10) Business Days notice to Borrower, unless an Event of
         Default has occurred and is  continuing or a material,  negative  audit
         finding has been made, in which case such  decrease  shall be effective
         immediately, for the purpose of calculating the amount which Lender may
         be willing to advance, or allow to remain outstanding, against Eligible
         Accounts.
                  (B) Term Loan. A term loan in the aggregate  principal  amount
         of Ten Million Dollars ($10,000,000) (the "Term Loan"),  evidenced by a
         term loan promissory note (the "Term Note"),  and repayable as provided
         therein. The Term Note shall be in a form and contain such terms as may
         be acceptable to Lender. The Term Loan shall be repayable in fifty-nine
         (59) equal consecutive  monthly  installments of principal plus accrued
         interest  commencing  on the  first  (1st)  Business  Day of the  month
         following  the  Closing  Date,  based  on  an  eighty-four  (84)  month
         amortization,  with all remaining  principal and all accrued but unpaid
         interest  thereon  payable at the end of the  Initial  Term;  provided,
         however, that if the Revolving Loan is terminated by Lender or Borrower
         for any reason the Term Loan shall be  immediately  due and  payable in
         full.
                  (C) Capex Loan. A Capital  Expenditure  line of credit ("Capex
         Loan") in an aggregate principal amount not to exceed the lesser of (i)
         $10,000,000 and (ii) 85% of the purchase price for new equipment and/or
         85% of the orderly  liquidation value (as determined by Lender) of used
         equipment,  in each case  exclusive  of taxes,  licenses,  delivery and
         installation expenses. Draws under the Capex Loan, once repaid, may not
         be  reborrowed.  Advances  under  the  Capex  Loan  will be  made  upon
         Borrower's  request for funds to finance the acquisition of new or used
         equipment, on the terms and subject to the conditions contained in this
         Agreement.  Draws  on  the  Capex  Loan  during  each  12-month  period
         following the Closing Date shall be combined  into a single  promissory
         note (each, a "Capex Note") at the end of such period,  repayable based
         upon a  60-month  amortization,  and  payable in full at the end of the
         Initial Term.  Until so evidenced by a Capex Note, Capex Loans shall be
         payable interest-only. If the Revolving Loan is terminated by Lender or
         Borrower for any reason,  the Capex Loan shall be  immediately  due and
         payable in full.
                  (D) Notice of Borrowing.  Borrower  shall request each Loan by
         delivering  to  Lender  an  irrevocable  written  notice in the form of
         Exhibit     "B",     appropriately     completed    (a    "Notice    of
         Borrowing/Conversion"), which specifies, among other things:
                           i  Whether  the  loan is to be a  Revolving  Credit
         Loan,  a Term Loan or a Capex  Loan (in each case  accompanied  by such
         supporting documentation as may be required hereunder);
                           (ii) The principal amount of the requested Borrowing;
                           (iii) Whether the requested Loan will be a Prime Rate
                           Loan or a
         LIBOR  Loan  (each  LIBOR  Borrowing  shall be in a  minimum  amount of
         $1,000,000 or an integral multiple of $1,000,000 in excess thereof);
                           (iv) If the requested Loan is to be a LIBOR Loan, the
         Interest  Period  selected by Borrower for such Loan in accordance with
         Section 2.1(i); and
                           
                           (v) The date of the requested Loan,  which shall be a
         Business Day.  Borrower shall give each Notice of  Borrowing/Conversion
         to  Lender  at  least  two (2)  Business  Days  before  the date of the
         requested Loan in the case of a Loan which will be a


                                        9




LIBOR Loan and before 10:00 a.m.  Pacific time on the date of the requested Loan
in the  case  of a Loan  which  will  be a  Prime  Rate  Loan.  Each  Notice  of
Borrowing/Conversion  shall be  delivered  to Lender at the  office or  telecopy
number  specified in Section  13.10;  provided,  however,  that  Borrower  shall
promptly  deliver to Lender the  original of any Notice of  Borrowing/Conversion
initially  delivered by telecopy.  Notwithstanding the above, no LIBOR Loans may
be requested at any time after the  occurrence  and during the  continuance of a
Default.
                  (E) Revolving Loan Interest Rates. Borrower shall pay interest
         on the outstanding principal balance of each Revolving Loan for so long
         as such Revolving Loan is outstanding,  at one of the following  rates,
         based on a year of 360 days and actual days elapsed:
                           (i)  During  such  periods  as any  Portion  of  such
         Revolving  Loan is a Prime Rate Loan,  at a rate per annum equal to the
         Prime Rate plus  one-half  of one percent  (0.5%),  such rate to change
         from time to time as the Prime Rate shall change; and
                           (ii)  During  such  periods  as any  Portion  of such
         Revolving  Loan is a LIBOR Loan, at a rate per annum equal at all times
         during each  Interest  Period for such LIBOR  Portion to LIBOR for such
         Interest Period plus two and three-quarter percent (2.75%).
                  (F) Term Loan Interest  Rates.  Borrower shall pay interest on
         the first day of each month on the unpaid  principal amount of the Term
         Loan from the date the Term Loan is made  until  paid in full at one of
         the  following  rates,  based  on a year of 360 days  and  actual  days
         elapsed:
                           i  During  such  period as any  Portion of the Term
         Loan is a Prime Rate Loan, at a rate per annum on such Portion equal to
         the Prime Rate plus one percent  (1.0%),  such rate to change from time
         to time as the Prime Rate shall change; and
                           (ii)  During  such  period as any Portion of the Term
         Loan is a LIBOR  Loan,  at a rate per annum  equal at all times  during
         each Interest Period for such Portion to LIBOR for such Interest Period
         plus three and one-half percent (3.5%).
                  (G) Capex Loan Interest Rates.  Borrower shall pay interest on
         the first day of each month on the aggregate unpaid principal amount of
         the Capex Loan from the date the first Capex Loan is made until paid in
         full at one of the  following  rates,  based  on a year of 360 days and
         actual days elapsed:
                           i During  such  period as any  Portion of the Capex
         Loan is a Prime Rate Loan, at a rate per annum on such Portion equal to
         the Prime Rate plus one percent  (1.0%),  such rate to change from time
         to time as the Prime Rate shall change; and
                           (ii)  During  such period as any Portion of the Capex
         Loan is a LIBOR  Loan,  at a rate per annum  equal at all times  during
         each Interest  Period for such LIBOR Portion to LIBOR for such Interest
         Period  plus  three  and  one-half  percent  (3.5%).  All  Capex  Loans
         evidenced  by  Capex  Notes  shall  bear  interest  and be  payable  in
         accordance with the terms of such Capex Notes.
                  (H)  Conversion  of  Interest  Rate  on  Loans.  So long as no
         Default  has   occurred  and  is   continuing,   Borrower  may  convert
         outstanding  Prime Rate Loans into LIBOR  Loans and  outstanding  LIBOR
         Loans into Prime Rate Loans; provided,


                                       10




         however,  that any  conversion  of LIBOR  Loans  into a Prime Rate Loan
         shall be made on, and only on, the last day of an  Interest  Period for
         such LIBOR Loans. At Lender's option in its sole  discretion,  upon the
         occurrence and at any time during the  continuation  of a Default,  all
         LIBOR Loans shall be converted to Prime Rate Loans,  and Borrower shall
         be liable for all costs and fees  associated  with such  conversion  as
         provided in this Agreement. Borrower shall request such a conversion by
         delivering   to   Lender   an   appropriately   completed   Notice   of
         Borrowing/Conversion, which specifies, among other things:
                           (i) The Prime Rate Portion or the LIBOR Portion which
         is to be  converted,  specifying  the amount  thereof and whether  such
         Portion is a Revolving  Loan Portion,  a Term Loan Portion,  or a Capex
         Loan Portion;
                           (ii) The  Type of  Loans  into  which  such  Loans or
         Portion are to be converted;
                           (iii) If Prime  Rate Loans are to be  converted  into
         LIBOR Loans, the Interest Period selected by Borrower for such Loans in
         accordance with Section 2.1(i); and
                           (iv)     The date of the requested  conversion, which
          shall be a Business Day.
Borrower shall give each Notice of  Borrowing/Conversion  to Lender at least two
(2) Business Days before the date of the  requested  conversion in the case of a
conversion  into LIBOR Loans,  and at least one (1) Business Day before the date
of the requested  conversion in the case of a conversion  into Prime Rate Loans.
Each Request for Borrowing/Conversion shall be delivered to Lender at the office
or to the telecopy number specified in Section 13.10;  provided,  however,  that
Borrower  shall  promptly  deliver  to  Lender  the  original  of any  Notice of
Borrowing/Conversion initially delivered by telecopy.
                 (i)LIBOR Interest  Periods.  The initial and each  subsequent
         Interest  Period  selected by Borrower for a LIBOR Loan shall be thirty
         (30), sixty (60) or ninety (90) days; provided,  however,  that (A) any
         Interest  Period  which  would  otherwise  end on a day  which is not a
         Business  Day shall be extended to the next  succeeding  Business  Day,
         unless such next Business Day falls in another calendar month, in which
         case  such  Interest  Period  shall  end on the  immediately  preceding
         Business Day; (B) any interest  Period for a LIBOR Loan which begins on
         the last Business Day of a calendar  month (or on a day for which there
         is no numerically corresponding day in the calendar month at the end of
         such Interest  Period) shall end on the last Business Day of a calendar
         month;  (C) no such Interest Period shall end after the Initial Term or
         any Renewal Term or after any scheduled  principal  payment date on any
         Loan,  if any  LIBOR  Portion  would  have to be  broken  in order  for
         Borrower to timely make such  principal  payment;  and (D) no more than
         six (6) Portions (Revolving Loan Portions,  Term Loan Portions or Capex
         Loan Portions in the aggregate)  bearing interest based on LIBOR may be
         outstanding at any time. If Borrower fails to notify Lender of the next
         Interest  Period for any LIBOR Portion in accordance  with this Section
         2.1(i),  such  Portion  shall  automatically  convert  to a Prime  Rate
         Portion on the last day of the current  Interest Period  therefor.  2.2
         ADVANCES TO CONSTITUTE ONE LOAN; LOAN PURPOSE. All Loans and advances
by Lender to Borrower  under this Agreement and the Ancillary  Agreements  shall
constitute  one loan and all  Liabilities  of  Borrower  to  Lender  under  this
Agreement and the Ancillary  Agreements shall constitute one general  obligation
secured by the  Collateral.  The  proceeds  of the  initial  Loans or  financial
accommodations made by Lender shall be used to repay 3-


                                       11
              




D's existing  obligations to Wells Fargo Bank and certain other  creditors,  and
the  proceeds of all Loans or financial  accommodations  made by Lender shall be
used to finance  Borrower's  and  certain  of its  Affiliates'  working  capital
requirements,  all on the terms and subject to the  conditions set forth in this
Agreement and in accordance with applicable law.
         2.3 INTEREST  RATE.  All  computations  of interest and fees under this
Agreement  shall be based on a year of 360 days and actual days  elapsed.  In no
contingency  or event  whatsoever  shall the rate or amount of interest  paid by
Borrower  under this  Agreement or any of the  Ancillary  Agreements  exceed the
maximum  rate or amount  permissible  under  any law which a court of  competent
jurisdiction  shall, in a final  determination,  deem applicable  hereto. In the
event that such a court determines that Lender has received  interest  hereunder
or under any Ancillary  Agreement in excess of the maximum  amount  permitted by
such law,  (i) Lender  shall apply such excess to any unpaid  principal  owed by
Borrower to Lender on the Revolving  Loan first,  and then to the Capex Loan and
Term Loan or, if the amount of such excess  exceeds  the unpaid  balance of such
principal,  Lender shall  promptly  refund such excess  interest to Borrower and
(ii)  the  provisions  hereof  shall  be  deemed  amended  to  provide  for such
permissible rate. All sums paid, or agreed to be paid, by Borrower which are, or
hereafter  may be  construed to be,  compensation  for the use,  forbearance  or
detention  of money  shall,  to the  extent  permitted  by  applicable  law,  be
amortized,  prorated,  spread and allocated throughout the full term of all such
indebtedness until the indebtedness is paid in full.
         2.4      CHANGE OF CIRCUMSTANCES.
                  (A) Inability to Determine  Rates.  If, on or before the first
         day of any Interest  Period of any Loan or Portion,  (i) LIBOR for such
         Interest  Period cannot be adequately and reasonably  determined due to
         the unavailability of funds in, or other circumstances  affecting,  the
         London  interbank  market or (ii) the LIBOR rates of interest  for such
         Loans or  Portions  do not  adequately  and fairly  reflect the cost to
         Lender of making or  maintaining  such Loans or Portions,  Lender shall
         promptly give notice of such condition to Borrower. After the giving of
         any such notice and until Lender shall  otherwise  notify Borrower that
         the  circumstances  giving  rise to such  condition  no  longer  exist,
         Borrower's  right to  request  the  making  of or  conversion  to,  and
         Lender's obligation to make or convert to LIBOR Loans or LIBOR Portions
         of the Type affected by such  condition  shall be suspended.  Any LIBOR
         Loans  or  LIBOR  Portions  of the  Type  affected  by  such  condition
         outstanding  at  the  commencement  of any  such  suspension  shall  be
         converted at the end of the then-current Interest Period for such Loans
         or Portions  into  another Type of Loan or Portion not affected by such
         suspension unless such suspension has then ended.
                  (B) Illegality.  If, after the date of this Agreement, (i) the
         adoption of any Governmental  Rule, (ii) any change in any Governmental
         Rule or the  application of requirements  thereof  (whether such change
         occurs  in  accordance  with  the  terms of such  Governmental  Rule as
         enacted,  as a result of amendment or  otherwise),  (iii) any change in
         the  interpretation  or  administration of any Governmental Rule by any
         Governmental  Authority,  or (iv) compliance by Lender with any request
         or  directive  (whether  or  not  having  the  force  of  law)  of  any
         Governmental Authority (each such occurrence,  a "Change of Law") shall
         make it unlawful or impossible for Lender to make or maintain any LIBOR
         Loan or LIBOR Portion, Lender shall immediately notify Borrower of such
         Change of Law.  Upon receipt of such notice,  (i)  Borrower's  right to
         request the making of or conversion to, and Lender's obligation to make
         or  convert  to, any Loans or  Portions  of the Type  affected  by such
         Change of Law shall


                                       12




         be  terminated,  and (ii)  Borrower  shall,  at the  request of Lender,
         either  (A)  pursuant  to  Section   2.1(h),   convert  any  such  then
         outstanding  Loans or Portions  into  another Type of Loans or Portions
         not  affected by such Change of Law at the end of the current  Interest
         Period for such Loans or Portions,  or (B) immediately repay or convert
         any such Loans or Portions if Lender shall notify  Borrower that Lender
         may not lawfully  continue to fund and maintain such Loans or Portions.
         Any  conversion or prepayment of Loans or Portions made pursuant to the
         preceding sentence prior to the last day of an Interest Period for such
         Loans or Portions shall be deemed a prepayment  thereof for purposes of
         this Agreement.
                  (C) Increased  Costs. If any Change of Law announced after the
         date of this Agreement:
                          (i)Shall  subject  Lender to any tax,  duty or other
         charge with respect to any LIBOR Loan or LIBOR Portion, or shall change
         the basis of  taxation of payments by Borrower to Lender on such a Loan
         or Portion or in respect to such a Loan or Portion under this Agreement
         (except  for  changes in the rate of taxation on the overall net income
         of Lender); or
                           (ii)  Shall  impose,  modify or hold  applicable  any
         reserve, special deposit or similar requirement against assets held by,
         deposits or other  liabilities  in or for the  account of,  advances or
         loans  by, or any other  acquisition  of funds by Lender  for any LIBOR
         Loan or LIBOR Portion; or
                           (iii)  Shall  impose  on Lender  any other  condition
         related to any LIBOR Loan or LIBOR Portion;
and the effect of any of the  foregoing is to increase the direct cost to Lender
of making,  renewing,  or maintaining any such LIBOR Loan or LIBOR Portion or to
reduce any amount receivable by Lender hereunder;  then Borrower shall from time
to time, upon demand by Lender,  pay to Lender additional  amounts sufficient to
reimburse  Lender for such  increased  direct costs or to compensate  Lender for
such reduced  amounts showing the calculation  thereof in reasonable  detail.  A
certificate  as to the  amount  of such  increased  costs  or  reduced  amounts,
submitted  by Lender to Borrower  shall,  in the absence of manifest  error,  be
conclusive and binding on Borrower for all purposes; provided, however, that the
increased  costs or reduced amounts shall not relate to any period more than 180
days prior to the date of such certificate.
                  (D)  Capital   Requirements.   If,  after  the  date  of  this
         Agreement, Lender determines that (i) any Change of Law announced after
         the date of this  Agreement  affects the amount of capital  required or
         expected to be maintained by Lender or any Person controlling Lender (a
         "Capital  Adequacy   Requirement")  and  (ii)  the  amount  of  capital
         maintained by Lender or such Person which is  attributable  to or based
         upon the Loans or this  Agreement must be increased as a result of such
         Capital  Adequacy  Requirement  (taking into  account  Lender's or such
         Person's policies with respect to capital adequacy), Borrower shall pay
         to Lender or such Person,  upon demand,  such amounts as Lender or such
         Person  shall  determine  are  necessary to  compensate  Lender or such
         Person  for the  increased  costs  to  Lender  or such  Person  of such
         increased  capital. A certificate of Lender setting forth in reasonable
         detail the computation of any such increased costs, delivered by Lender
         to Borrower  shall, in the absence of manifest error, be conclusive and
         binding on  Borrower  for all  purposes;  provided,  however,  that the
         increased  costs or reduced amounts shall not relate to any period more
         than 180 days prior to the date of such  certificate.  2.5 FUNDING LOSS
         INDEMNIFICATION. If Borrower shall (a) repay or prepay any


                                       13




LIBOR Loan or LIBOR  Portion  on any day other than the last day of an  Interest
Period  therefor  (whether an optional  prepayment,  a mandatory  prepayment,  a
payment upon  acceleration  or otherwise) or (b) fail to borrow  (including  any
conversion  to)  any  LIBOR  Loan  or  LIBOR  Portion  for  which  a  Notice  of
Borrowing/Conversion  has been  delivered to Lender  (whether as a result of the
failure to satisfy any applicable  conditions or otherwise) Borrower shall, upon
demand by Lender,  reimburse  Lender and hold Lender  harmless for all costs and
losses incurred by Lender as a result of such repayment,  prepayment or failure.
Borrower understands that such costs and losses may include, without limitation,
losses  incurred  by Lender as a result of funding and other  contracts  entered
into by Lender to fund a LIBOR Loan or LIBOR  Portion.  If Lender  shall  demand
payment  under this Section 2.5,  Lender shall deliver to Borrower a certificate
setting  forth the amount of costs and losses for which demand is made,  showing
the calculation thereof in reasonable detail. Such a certificate so delivered to
Borrower  shall,  in the absence of manifest error, be conclusive and binding on
Borrower as to the amount of such loss for all purposes.
         2.6      PREPAYMENTS.
                  (A)  Voluntary  Prepayments.  Subject to Section 2.7 below and
         except for the paydown of the  Revolving  Loans from the  collection of
         the Accounts, Borrower may prepay the Loans in whole or in part only if
         (i)  Borrower  gives  Lender  written  notice  (which shall be given by
         first-class  mail or  telecopy  to the  office or the  telecopy  number
         specified  in  Section  13.10)  of  Borrower's  intention  to make such
         prepayments,  at least  one (1)  Business  Day prior to  tendering  the
         prepayments,  (ii)  the  total  amount  of the  prepayments  is a whole
         multiple of  $1,000,000  (or the entire  remaining  balance of the Term
         Loan or the Capex Loan),  and (iii) Borrower pays any accrued  interest
         on the  amount  prepaid  at the  time of  such  prepayment.  Each  such
         prepayment will be applied by Lender to reduce the applicable Loan and,
         in the case of the  Term  Loan  and the  Capex  Notes,  to  reduce  the
         repayment installments in the inverse order of maturity of payments.
                  (B) Mandatory  Prepayments When Overadvances  Exist. If at any
         time the  outstanding  amount of the Revolving Loan exceeds  Collateral
         Availability  or the aggregate  outstanding  Revolving Loan exceeds Ten
         Million Dollars  ($10,000,000) (an "Overadvance"),  whether as a result
         of advances by Lender, a decline in the value of Eligible Accounts,  or
         otherwise,  Borrower shall on demand by Lender make a prepayment in the
         amount of the Overadvance.
         2.7 TERM OF AGREEMENT;  PREPAYMENT;  LIQUIDATED DAMAGES. This Agreement
shall be in effect  until  five (5) years  from the date  hereof  (the  "Initial
Term") and shall be automatically  renewed  thereafter for successive periods of
one year (each a "Renewal Term") unless  terminated as provided below.  Borrower
and Lender  shall have the right to terminate  this  Agreement at the end of the
Initial  Term or at the end of any  Renewal  Term by giving  the other  party at
least sixty (60) days' prior written  notice of such  termination.  In the event
Borrower gives notice of termination  and the Total Facility is not paid in full
at the end of the Initial Term or Renewal Term, as applicable,  upon the request
of  Borrower,  but in  Lender's  sole  discretion,  Lender may  continue to make
advances  under the  Revolving  Loan and renew this  Agreement for an additional
year, upon such terms and conditions as Lender may require.  In the event Lender
does not agree to continue to make advances and renew the term for an additional
year, all Liabilities  shall be immediately due and payable.  This Agreement may
also be  terminated  by  Lender  upon  the  occurrence  of a  Default.  Upon the
effective date of any termination,  all of the Liabilities (including the Notes)
shall become immediately due and payable without presentment,  notice or demand.
Notwithstanding any


                                       14




termination, until all of the Liabilities shall have been fully and finally paid
and satisfied,  Lender shall be entitled to retain its security  interest in the
Collateral,  Borrower  shall  continue  to remit  collections  of  Accounts  and
proceeds of  Collateral as provided in this  Agreement,  and Lender shall retain
all of its rights and remedies under this Agreement.  During the Initial Term or
any Renewal Term,  Borrower  may, at its option,  upon not less than ninety (90)
days'  prior  written  notice  to  Lender  specifying  the  date of  prepayment,
terminate this Agreement and prepay all of the  Liabilities  hereunder.  In such
event,  Borrower  shall  pay to  Lender  for  loss of the  bargain  and not as a
penalty,  as liquidated  damages and as  compensation  for the costs of Lender's
being  prepared to make funds  available to Borrower  under this  Agreement,  an
amount (the "Prepayment Fee") equal to the following  percentages of the maximum
Total  Facility  during the given  year:  3.0% in the first year  following  the
Closing  Date,  2.0% in the second year  following  the Closing  Date,  and 1.0%
during any year thereafter. In addition,  Borrower shall pay to Lender, upon any
prepayment  in whole or in part of the Term Loan  and/or the Capex  Loan,  a fee
equal to the foregoing percentages of the principal amount so prepaid;  provided
that,  if such  prepayment  is made with the proceeds of equity or  subordinated
debt  issued by  Borrower  or 3-D and  permitted  pursuant  to the terms of this
Agreement,  Borrower  shall pay a fee equal to 1.0% of the  principal  amount so
prepaid (the "Reduced Prepayment Amount"), regardless of the date of prepayment.
If, however,  this Agreement is terminated prior to the end of the Initial Term,
Borrower shall be required at the time of termination to pay (in addition to the
Prepayment Fee described  above) the difference  between the Reduced  Prepayment
Amount and the fee which would  otherwise  have been  applicable to such prepaid
amount  (had  proceeds  of  equity or  subordinated  debt not been used for such
prepayment).  Borrower shall also be  responsible to pay, in every event,  LIBOR
breakage  penalties  pursuant  to Section  2.5,  and if any fixed rate Loans are
outstanding Borrower agrees to pay an additional  prepayment charge equal to the
actual loss, if any, that may be sustained by Lender through redeployment of the
funds loaned to Borrower at the then prevailing interest rates.
         2.8 AUDIT FEE.  Borrower shall pay to Lender its  reasonable  costs and
expenses  incurred during the course of periodic field  examinations and audits,
including  a per diem charge for  examiners  in the field and office at Lender's
then prevailing rate (currently $500 per person per day).
         2.9  CLOSING  FEE.  Borrower  shall pay to  Lender,  in cash,  upon the
execution  of this  Agreement,  a Closing  Fee in the  amount  of Three  Hundred
Thousand Dollars ($300,000).
         2.10  UNUSED LINE FEE.  Borrower  shall pay to Lender,  each month,  an
unused  line fee  equal to  one-half  of one  percent  (0.50%)  per annum of the
difference between the maximum commitment for the Revolving Loan ($10,000,000 as
of the Closing  Date) and the daily  average  outstanding  borrowings  under the
Revolving Loan for the prior month.  The unused line fee shall be in addition to
any other fees or charges owing with respect to the Revolving Loan.


                                       15




3.       ELIGIBLE ACCOUNTS
         3.1 ELIGIBLE  ACCOUNTS.  Upon Borrower's  delivery to Lender of a Daily
Collateral  Report,  Lender shall  determine  which  individual  Accounts listed
thereon are Eligible  Accounts.  Unless otherwise agreed to by Lender in writing
and except as  specifically  set forth in the proviso at the end of this Section
3.1,  Eligible  Accounts  shall be (i) Accounts of Borrower,  (ii) to the extent
Lender has a first priority  perfected  security interest  therein,  Accounts of
J.R.S.  Exploration  Company,  Ltd.,  and  (iii) to the  extent  owing by PEMEX,
Accounts of Geoevaluaciones,  S.A. de C.V., and Procesos  Interactivos,  S.A. de
C.V.,  and  shall in each  case and at all  times be  subject  to the  following
requirements for eligibility:
                  (A) If the Account  arises from the sale of goods,  such goods
         shall have been shipped or delivered on open account and on an absolute
         sale basis and not on consignment,  on approval or on a  sale-or-return
         basis and  shall  not be  subject  to any  other  repurchase  or return
         agreement and no material part of such goods shall have been  returned,
         repossessed, rejected, lost or damaged;
                  (B) Except as specifically set forth in the proviso at the end
         of this  Section  3.1, if the Account  arises from the  performance  of
         services, such services shall have been performed in full;
                  (C) The Account  shall not be evidenced by chattel paper or an
         instrument of any kind;
                  (D) The Account Debtor  obligated on such Account shall not be
         suspended  from  doing  business,  insolvent  or  the  subject  of  any
         bankruptcy or  insolvency  proceeding of any kind, or the subject of an
         assignment  for the  benefit of  creditors,  or have had a receiver  or
         trustee appointed for a significant  portion of its assets,  and Lender
         shall be satisfied with the creditworthiness of such Account Debtor;
                  (E) The Account Debtor  obligated on such Account shall not be
         a supplier to or creditor  of  Borrower,  except to the extent that the
         aggregate  of  such  Account  Debtor's   Accounts  exceeds   Borrower's
         liabilities (including contingent liabilities) to such Account Debtor;
                  (F) Except as specifically set forth in the proviso at the end
         of this  Section  3.1, if the  Account is owing from an Account  Debtor
         located  outside the United States or Canada (unless the Account Debtor
         is PEMEX),  such Account Debtor shall have  furnished  Borrower with an
         irrevocable  letter  of  credit  issued  or  confirmed  by a  financial
         institution  acceptable  to Lender,  which letter of credit shall be in
         form and  substance  acceptable  to Lender,  pledged to Lender,  and be
         payable  in  Dollars  in an amount  not less than the face value of the
         Account;
                  (G)  The  Account  shall  be  a  valid,   legally  enforceable
         obligation of the Account Debtor,  reduced by the amount of any offset,
         counterclaim  or  defense  denying  liability  thereunder  asserted  in
         writing by such Account Debtor;
                  (H) The  Account  shall be subject to and  covered by Lender's
         perfected security interest and shall not be subject to any other lien,
         claim, encumbrance or security interest;
                 (i)The  Account  shall be  evidenced  by an  invoice or other
         documentation in form acceptable to Lender;
                  (J) The Account  shall not have  remained  unpaid for a period
         exceeding  ninety  (90) days  after the  original  invoice  date of the
         related invoice and not more than fifty percent (50%) of the balance of
         all Accounts owing from the Account Debtor obligated under such Account
         shall have  remained  unpaid for more than  ninety  (90) days after the
         invoice date of the related invoices or otherwise be deemed


                                       16




         ineligible;
                  (K) If the  Account  Debtor  is  located  in the  State of New
         Jersey or the State of Minnesota, Borrower shall have filed a Notice of
         Business Activities Report with the appropriate agency in New Jersey or
         Minnesota, as applicable, for the then current year;
                  (L) The Account shall not be owing from an employee,  officer,
         agent, director or stockholder of Borrower or any Affiliate or from the
         United States of America or any department,  agency or  instrumentality
         thereof;
                  (M) The aggregate  amount of Accounts  from an Account  Debtor
         owing to any of the Companies  shall not, at any time,  exceed  fifteen
         percent  (15%)  (twenty-five  percent  (25%) in the case of  Occidental
         Petroleum and other major energy companies approved by Lender from time
         to time in its  discretion,  reasonably  exercised,  and thirty percent
         (30%) in the case of PEMEX  and  British  Petroleum)  of the  aggregate
         amount of existing Eligible Accounts;
                  (N) The Account  shall be one against  which Lender is legally
         permitted to make loans and advances;
                  (O) Each of the  warranties and  representations  set forth in
         Section 9.2 shall be  reaffirmed  with  respect to such  Account at the
         time that the most recent  Daily  Collateral  Report was  delivered  to
         Lender;
                  (P) The Account shall not consist of unapplied cash,  deferred
         revenue,  deposits from customers,  Direct Charges or credits in excess
         of ninety (90) days; and
                  (Q) The Account shall otherwise be acceptable to Lender in its
         discretion, reasonably exercised;
provided,  however, that Lender shall deem the following Accounts to be Eligible
Accounts,  subject to the terms specified herein: (i) British Petroleum extended
terms balance owing to Borrower, eligible only through January 31, 1998, subject
to a limit of  $1,200,000  on advances  against such  Accounts  (ii) Accounts of
PEMEX owing to  Geoevaluaciones,  S.A. de C.V., subject to a limit of $3,000,000
on advances  against  such  Accounts  (provided  that the  aggregate of advances
against the British  Petroleum balance described in clause (i) and the amount of
advances against PEMEX Eligible Accounts may not exceed $3,000,000 at any time),
and (iii)  progress  billings,  subject  to a limit of  $1,000,000  on  advances
against such Accounts. 4. PAYMENTS
         4.1 LOAN ACCOUNT;  METHOD OF MAKING  PAYMENTS.  Lender shall maintain a
loan  account  (the "Loan  Account") on its books in which shall be recorded (i)
all loans and advances  made by Lender to Borrower  pursuant to this  Agreement,
(ii) all payments  made by Borrower on all such loans and advances and (iii) all
other appropriate  debits and credits as provided in this Agreement,  including,
without limitation, all fees, charges, expenses and interest. All entries in the
Loan Account shall be made in  accordance  with  Lender's  customary  accounting
practices as in effect from time to time. Unless otherwise agreed to in writing,
all payments  which  Borrower is required to make to Lender under this Agreement
or under any of the Ancillary  Agreements shall be made by appropriate debits to
the Loan Account. Lender may, in its discretion,  elect to bill Borrower for the
amount of any such  payment in which case such amount shall be  immediately  due
and payable  with  interest  thereon at the rate then  applicable  to Prime Rate
Revolving Loan Portions.
         4.2 PAYMENT TERMS. Unless otherwise expressly provided in writing,  the
Liabilities  will be repayable as follows:  (i) interest shall be payable on the
first day of each month (for the immediately  preceding  month) out of the first
collections received with respect


                                       17




to any proceeds of Collateral,  (ii) fees,  costs,  expenses and similar charges
shall be payable as and when  provided for in this  Agreement  or the  Ancillary
Agreements,  and (iii) the principal balance of the Liabilities shall be payable
from  collections  received  with respect to any proceeds of  Collateral as such
proceeds are received;  provided,  however,  that if at any time the outstanding
principal  balance of the Revolving Loan exceeds the Collateral  Availability or
the outstanding  principal  balance of all of the Liabilities  exceeds the Total
Facility,  Borrower shall  immediately pay to Lender such amount as is necessary
to eliminate  such excess.  Subject to the  foregoing  and to the  provisions of
Section 2.7, the Term Loan will be payable as provided in the Term Note.  All of
the  Liabilities  shall be payable at the address of Lender set forth in Section
13.10. Nothing contained in this Section shall authorize Borrower to sell, lease
or otherwise  dispose of any  Collateral  other than as  expressly  set forth in
Sections 6.4 and 8.3.
         4.3 COLLECTION OF ACCOUNTS AND PAYMENTS.  Lender has established one or
more  special  accounts in Lender's  name with Wells Fargo Bank  located at 1000
Louisiana,  3rd Floor, Houston, Texas 77002 (Attention:  Alan Alexander,  Energy
Department) and Bank One, Colorado,  N.A., located at 1125 17th Street,  Denver,
Colorado 80202-2088 (Attention:  Ann Lyons) (collectively  "Depository Bank") to
which  Borrower will  immediately  deposit all  remittances  and proceeds of the
Collateral in the identical form in which such payment was made, whether by cash
or check.  Borrower hereby agrees that all payments made to such special account
or otherwise received by Lender, whether on the Accounts or as proceeds of other
Collateral or otherwise,  will be the sole and exclusive  property of Lender and
will be applied on account of the  Liabilities.  After allowing one (1) calendar
day for collection  after such funds are received by Lender,  Lender will credit
(conditional  upon final  collection) all payments  received through the special
account  to  the  Loan  Account.  Borrower  and  any  Affiliates,  shareholders,
directors, officers, employees, agents of Borrower and all Persons acting for or
in concert with Borrower who receive any monies,  checks,  notes,  drafts or any
other  payments  relating to or proceeds of Accounts or other  Collateral  which
come into their  possession or under their control shall,  acting as trustee for
Lender,  hold such  property  as the sole and  exclusive  property of Lender and
immediately upon receipt  thereof,  shall remit the same or cause the same to be
remitted, in kind, to Lender. Borrower agrees to pay to Lender any and all fees,
costs and expenses (if any) which Lender incurs in  connection  with opening and
maintaining  the special  account and  depositing  for  collection by Lender any
check or item of payment  received or delivered to Depository Bank in connection
with the  special  account or any  returned  or  collected  checks  received  by
Depository Bank for deposit in the special account.
         4.4  APPLICATION  OF PAYMENTS  AND  COLLECTIONS.  Borrower  irrevocably
waives the right to direct the application of payments and collections  received
by Lender from or on behalf of Borrower,  and Borrower  agrees that Lender shall
have  the  continuing  exclusive  right to apply  and  reapply  any and all such
payments and  collections  against the  Liabilities in such manner as Lender may
deem appropriate,  notwithstanding any entry by Lender upon any of its books and
records.  To the extent that  Borrower  makes a payment or payments to Lender or
Lender  receives  any  payment or  proceeds  of the  Collateral  for  Borrower's
benefit,  which  payment(s)  or  proceeds or any part  thereof are  subsequently
invalidated, declared to be fraudulent or preferential, set aside or required to
be repaid to a trustee,  receiver or any other party under any  bankruptcy  act,
state or federal law,  common law or equitable  cause,  then, to the extent such
payment or  proceeds  received  are so set aside,  invalidated,  required  to be
repaid or the like,  the  Liabilities  or part thereof  intended to be satisfied
shall be  revived  and  shall  continue  in full  force and  effect,  as if such
payments or proceeds had not been


                                       18




received by Lender.
         4.5  STATEMENTS.   All  advances  and  other  financial  accommodations
hereunder  to Borrower,  and all other  debits and credits  provided for in this
Agreement,  shall be evidenced  by entries  made by Lender in its internal  data
control  systems  showing  the date,  amount  and  reason for each such debit or
credit.  Until  such time as Lender  shall have  rendered  to  Borrower  written
statements of account as provided  herein,  the balance in the Loan Account,  as
set forth on Lender's most recent  statement,  shall be presumptive  evidence of
the  amounts  due and owing to Lender by  Borrower.  Not more than ten (10) days
after the final day of each  calendar  month,  Lender shall render to Borrower a
statement  setting forth the balance of the Loan Account,  including  principal,
interest,  expenses and fees. Each such statement shall be subject to subsequent
adjustment by Lender and Lender's right to reapply  payments in accordance  with
Section 4.4, but shall, absent manifest errors or omissions, be presumed correct
and binding upon Borrower and shall constitute an account stated unless,  within
thirty (30) days after  receipt of any  statement  from Lender,  Borrower  shall
deliver to Lender written objection  thereto  specifying the error or errors, if
any, contained in such statement.
5.       COLLATERAL: GENERAL TERMS
         5.1 SECURITY  INTEREST.  To secure the prompt  payment to Lender of the
Liabilities,  Borrower hereby grants to Lender a continuing security interest in
and to all of Borrower's now owned or existing and hereafter acquired or arising
tangible and  intangible  assets,  including  without  limitation  the following
property and  interest in property of Borrower  whether now owned or existing or
hereafter acquired or arising and wherever located: (i) all Accounts, Inventory,
Equipment, contract rights (including,  without limitation, the right to receive
monies due under all contracts  which may otherwise  prohibit such  assignment),
General Intangibles, tax refunds, chattel paper, instruments, letters of credit,
investment  property,  documents  and  documents  of  title;  (ii)  all  of  the
Borrower's deposit accounts (general or special) including those maintained with
Depository Bank or any other financial institution (iii) all monies, and any and
all  other  property  of  Borrower  now or  hereafter  coming  into  the  actual
possession,  custody or control of Lender, or any Affiliate of Lender in any way
or  for  any  purpose  (whether  for  safekeeping,   deposit,  custody,  pledge,
transmission,  collection or otherwise); (iv) all of Borrower's Computers, books
and records;  and (v) all insurance and other  proceeds of or relating to any of
the foregoing;  and (vi) all accessions and additions to, substitutions for, and
replacements, products and proceeds of any of the foregoing.
         5.2 DISCLOSURE OF SECURITY  INTEREST.  Borrower shall make  appropriate
entries upon its financial  statements and books and records disclosing Lender's
security interest in the Collateral.
         5.3 SPECIAL  COLLATERAL.  Immediately  upon  Borrower's  receipt of any
Collateral which is evidenced or secured by an agreement,  chattel paper, letter
of credit,  instrument or document,  including,  without limitation,  promissory
notes,  documents of title and warehouse  receipts  (the "Special  Collateral"),
Borrower shall deliver the original thereof to Lender or to such agent of Lender
as Lender shall designate, together with appropriate endorsements, the documents
required to draw  thereunder  (as may be relevant to letters of credit) or other
specific  evidence (in form and  substance  acceptable  to Lender) of assignment
thereof to Lender and shall take such  actions as Lender may  require to perfect
Lender's  security  interest  in such  Special  Collateral  and  any  collateral
securing such Special Collateral.
         5.4 FURTHER ASSURANCES.  At Lender's request, Borrower shall, from time
to time,  (i) execute and deliver to Lender all Security  Documents  that Lender
may reasonably request, in form and substance  acceptable to Lender, and pay the
costs of any recording or filing of


                                       19




the same and (ii) take such  other  actions  as Lender  may  request in order to
fully effect the purposes of this Agreement and to protect Lender's  interest in
the  Collateral.  Upon the occurrence of any uncured  Default,  Borrower  hereby
irrevocably  makes,  constitutes and appoints Lender (and all Persons designated
by  Lender  for that  purpose)  as  Borrower's  true  and  lawful  attorney  and
agent-in-fact to sign the name of Borrower on any of the Security  Documents and
to deliver any of the Security  Documents to such Persons as Lender, in its sole
discretion,  may elect.  This power of  attorney  is coupled  with an  interest.
Borrower agrees that a photocopy or other reproduction of this Agreement or of a
financing statement is sufficient as a financing statement. Upon Borrower's cure
of any Default,  Lender shall have the right to complete any action commenced by
it as attorney or agent-in-fact while such Default was continuing.
         5.5  INSPECTION.  Lender (by any of its officers,  employees or agents)
shall have the right, at any time or times without prior notice,  to inspect the
Collateral, all records related thereto (and to make extracts from such records)
and the  premises  upon  which any of the  Collateral  is  located,  to  discuss
Borrower's  affairs  and  finances  with any Person  and to verify  the  amount,
quality,  value  and  condition  of,  or  any  other  matter  relating  to,  the
Collateral;  provided  that  for so  long  as no  Default  is  continuing,  such
inspections shall occur only during  Borrower's normal business hours.  Borrower
shall pay all costs and  expenses  incurred  by Lender in the course of periodic
audits and  examinations of the Collateral (and any collateral for any Guaranty)
and Borrower's (and any of the Companies')  operations plus a per diem charge at
Lender's  then  prevailing  rate  (currently  $500 per  person  per day) for its
auditors and examiners in the field and office.
         5.6 PERFECTION AND PRIORITY;  LOCATION OF COLLATERAL.  Borrower's chief
executive  office,  principal  place  of  business  and all  other  offices  and
locations of the Collateral and books and records  related  thereto  (including,
without  limitation,  the  Computers,  computer  programs,  printouts  and other
computer materials and records concerning the Collateral but excluding temporary
field locations  established by Borrower in the ordinary course of its business)
are set forth on Exhibit  "C"  attached  hereto.  Borrower  shall not remove its
books  and  records  or the  Collateral  from any  such  locations  (except  for
movements of Equipment in the ordinary course of Borrower's  business within the
states listed on Exhibit "C" and in accordance with the terms of this Agreement)
and shall not open any new offices or  relocate  any of its books and records or
the Collateral  except within the continental  United States of America and with
at least thirty (30) days' prior written notice thereof to Lender.
         5.7 LENDER'S PAYMENT OF CLAIMS ASSERTED AGAINST COLLATERAL. Lender may,
but  shall not be  obligated  to,  at any time or times  hereafter,  in its sole
discretion,  and  without  waiving  any  Default  or waiving  or  releasing  any
obligation,  liability or duty of Borrower under this Agreement or the Ancillary
Agreements, pay, acquire or accept an assignment of any security interest, lien,
claim or other encumbrance asserted by any Person against the Collateral, unless
Borrower is then contesting the related charge,  lien, claim,  security interest
or  encumbrance as permitted by Section 10.3. All sums paid by Lender under this
Section,  including all costs,  fees  (including  reasonable  attorneys'  fees),
expenses and other  charges  relating  thereto,  shall be payable by Borrower to
Lender on demand and shall be additional Liabilities secured by the Collateral.


                                       20




6.       COLLATERAL: ACCOUNTS
         6.1 VERIFICATION OF ACCOUNTS.  Any of Lender's  officers,  employees or
agents shall have the right,  at any time or times  hereafter,  in Borrower's or
Lender's name or tradestyle  or in the name of a firm of  independent  certified
public accountants  acceptable to Lender, to verify the validity,  amount or any
other  matters  relating  to any  Accounts  by  mail,  telephone,  telegraph  or
otherwise.
         6.2 ASSIGNMENTS,  RECORDS AND DAILY COLLATERAL  REPORT.  Borrower shall
keep accurate and complete  records of its Accounts and, as frequently as Lender
shall require, but not less frequently than twice weekly, Borrower shall deliver
to Lender a Daily  Collateral  Report  and  formal  written  assignments  of all
Accounts,  together with (upon Lender's  request) copies of the invoices related
thereto.  Borrower shall also deliver to Lender, upon demand,  copies (or, after
an  uncured  Default,  originals  if  requested  by  Lender)  of all  documents,
including,  without limitation,  repayment histories, present status reports and
shipment  reports,  relating to the  Accounts  included in any Daily  Collateral
Report and such other  matters  and  information  relating to the status of then
existing Accounts as Lender shall reasonably request.
         6.3 NOTICE  REGARDING  DISPUTED  ACCOUNTS.  Borrower  shall give Lender
prompt notice of any Accounts which, for an Account Debtor,  aggregate in excess
of One Hundred  Thousand  Dollars  ($100,000)  in dispute  between  such Account
Debtor and Borrower.  In addition,  each Daily Collateral  Report shall identify
all disputed  Accounts and disclose,  in reasonable  detail,  the reason for the
dispute, all claims related thereto and the amount in controversy.
         6.4 SALE OR  ENCUMBRANCE OF ACCOUNTS.  Borrower shall not,  without the
prior written consent of Lender, sell, transfer, grant a security interest in or
otherwise  dispose of or encumber  any of its  Accounts to any Person other than
Lender.
7.       COLLATERAL:  INVENTORY
         Borrower shall keep such records with respect to its Inventory, if any,
as Lender  shall  reasonably  request  and shall  provide  copies of the same to
Lender promptly upon request.
8.       COLLATERAL: EQUIPMENT
         8.1 MAINTENANCE OF THE EQUIPMENT.  Borrower shall keep and maintain the
Equipment in good  operating  condition  and repair and shall make all necessary
replacements thereof so that the value, utility and operating efficiency thereof
shall at all times be maintained and preserved and shall promptly  inform Lender
of any material additions to or deletions from the Equipment. Borrower shall not
permit any such  Equipment to become  affixed to real estate in such manner that
such Equipment will become a fixture or an accession to other personal property.
         8.2 EVIDENCE OF OWNERSHIP OF EQUIPMENT.  Borrower shall,  upon Lender's
request,   deliver  to  Lender  all  evidence  of  ownership  of  the  Equipment
(including,  without  limitation,  bills of  sale,  certificates  of  title  and
applications for title).
         8.3  PROCEEDS  OF THE  EQUIPMENT.  Borrower  shall not sell,  transfer,
lease,  grant a security  interest in or  otherwise  dispose of or encumber  the
Equipment  or any part  thereof  to any  Person  other  than  Lender;  provided,
however, that (i) Borrower may complete the sale of up to $400,000 worth of real
estate and related assets in Ohio, currently in progress; and (ii) in any fiscal
year of Borrower,  Borrower may sell or otherwise  dispose of Equipment  with an
aggregate  net book  value not to exceed  Two  Hundred  Fifty  Thousand  Dollars
($250,000).  In the event any Equipment or real estate is sold,  transferred  or
otherwise  disposed of as permitted in this  Section,  Borrower  shall  promptly
notify  Lender of such fact and deliver  all of the cash  proceeds of such sale,
transfer or disposition to Lender, which


                                       21




proceeds  shall  be  applied  to the  repayment  of the  Liabilities;  provided,
however,  that  with  Lender's  prior  consent,  in  its  discretion  reasonably
exercised,  Borrower may use the proceeds of such sale,  transfer or disposition
of Equipment to finance the  purchase of  replacement  Equipment in which Lender
has a first priority, perfected security interest documented to the satisfaction
of Lender.  Borrower shall deliver to Lender written  evidence of the use of the
proceeds for such  purchase.  All  replacement  Equipment  purchased by Borrower
shall be free and  clear of all  liens,  claims,  security  interests  and other
encumbrances,  except for the security  interest granted to Lender and Permitted
Liens.
         8.4 LOCATION OF EQUIPMENT.  Borrower and the other  Companies  shall at
all times maintain in the United States,  in  jurisdictions  in which Lender has
perfected  its  security  interest  in  Borrower's  and the  Companies'  assets,
Equipment   with  an  orderly   liquidation   value   (determined   to  Lender's
satisfaction) of not less than $20,000,000. Borrower shall deliver a certificate
to Lender  monthly  confirming  and detailing  Borrower's  compliance  with such
covenant. 9. WARRANTIES AND REPRESENTATIONS
         9.1 GENERAL  WARRANTIES  AND  REPRESENTATIONS.  Borrower  warrants  and
represents that:
                  (A)  Existence  and  Qualification.  Borrower is a corporation
         duly organized and validly existing and in good standing under the laws
         of the state of its  incorporation  and is  qualified  or licensed as a
         foreign  corporation to do business in all other countries,  states and
         provinces in which the laws thereof require Borrower to be so qualified
         or licensed;
                  (B) Other Names.  Borrower  has not used,  during the five (5)
         year period  preceding the date of this Agreement,  and does not intend
         to use, any other corporate or fictitious name,  except as disclosed in
         Exhibit "D" attached hereto;
                  (C) Authority and Power.  Borrower has the right and power and
         is duly  authorized and empowered to enter into,  execute,  deliver and
         perform this  Agreement and the  Ancillary  Agreements to which it is a
         party;
                  (D) Compliance with Law and Other  Agreements.  The execution,
         delivery  and  performance  by  Borrower  of  this  Agreement  and  the
         Ancillary Agreements shall not, by their execution or performance,  the
         lapse  of time,  the  giving  of  notice  or  otherwise,  constitute  a
         violation  of  any  applicable  and  material  law,  rule,  regulation,
         judgment,  order or decree or a breach of any  provision  contained  in
         Borrower's  charter documents or by-laws or contained in any agreement,
         instrument,  indenture  or other  document  to which  Borrower is now a
         party or by which it is bound;
                  (E) Use of  Proceeds.  Borrower's  use of the  proceeds of any
         advances  made by Lender is and will  continue to be a legal and proper
         corporate use (duly authorized by its board of directors, in accordance
         with  applicable and material law, rule or regulation)  and such use is
         and will continue to be consistent with all applicable  laws, rules and
         regulations;
                  (F) Governmental  Approvals.  Borrower has, and is current and
         in good standing with respect to, all governmental approvals,  permits,
         certificates, inspections, consents and franchises necessary to conduct
         and to  continue  to conduct  its  present  and  intended  business  as
         heretofore  conducted  by it  and  to  own or  lease  and  operate  its
         properties  as now owned or leased and  operated by it; and to the best
         knowledge of Borrower,  none of said governmental  approvals,  permits,
         certificates,  consents or  franchises  contains  any term,  provision,
         condition or  limitation  more  burdensome  than such as are  generally
         applicable to Persons engaged in the same or similar business as


                                       22




         Borrower;
                  (G) Solvency.  Borrower now has capital sufficient to carry on
         its business and  transactions  and all businesses and  transactions in
         which it is  about to  engage  and is now  solvent  and able to pay its
         debts as they mature and  Borrower  now owns  property the fair salable
         value of which is greater  than the amount  required to pay  Borrower's
         debts;
                  (H) No  Litigation,  Indebtedness  or  Guaranties.  Except  as
         disclosed on Exhibit "E" attached  hereto,  Borrower has no  litigation
         pending,  or  to  the  best  of  its  knowledge,   threatened,  and  no
         Indebtedness  (except for trade payables arising in the ordinary course
         of its business since the dates  reflected in the  Financials)  and has
         not guaranteed the obligations of any other Person;
                 (i)No Other Adverse  Agreements or Arrangements.  Borrower is
         not a party to any  contract  or  agreement  or subject to any  charge,
         restriction,   judgment,  decree  or  order  materially  and  adversely
         affecting  its  business,  property,  assets,  operations or condition,
         financial  or  otherwise,  and is not a  party  to any  labor  dispute,
         lockout,  strike or walkout relating to any labor contracts and no such
         contract is scheduled to expire during the Initial Term;
                  (J)  Good  Title.   Borrower   has  good,   indefeasible   and
         merchantable title to, and ownership of, the Collateral, free and clear
         of all liens, claims, security interests and other encumbrances, except
         those of Lender and those described on Exhibit "F" attached hereto;
                  (K) No Violation of Laws.  To the best  knowledge of Borrower,
         Borrower  is  not  in  violation  of  any  applicable  statute,   rule,
         regulation or ordinance of any governmental entity, including,  without
         limitation,  the  United  States of  America,  any state,  city,  town,
         municipality,  county  or any  other  jurisdiction,  or of  any  agency
         thereof,   in  any  respect  materially  and  adversely  affecting  the
         Collateral  or Borrower's  business,  property,  assets,  operations or
         condition, financial or otherwise;
                  (L) No Lien or Borrowing Defaults.  Borrower is not in default
         under any indenture, loan agreement,  mortgage, lease, deed of trust or
         other  similar  agreement  relating  to  the  borrowing  of  monies  or
         encumbering of assets to which it is a party or by which it is bound;
                  (M)  Financials.  The  Financials  fairly  present the assets,
         liabilities  and  financial  condition and results of operations of 3-D
         and such other Persons described therein as of the dates thereof; there
         are no  omissions or other facts or  circumstances  which are or may be
         material  and  there has been no  material  and  adverse  change in the
         assets,  liabilities  or financial or other  condition of 3-D or any of
         such other  Persons  since the date of the  Financials;  there exist no
         equity or long  term  investments  in or  outstanding  advances  to any
         Person  not  reflected  in the  Financials;  there  are no  actions  or
         proceedings which are pending or, to the best of Borrower's  knowledge,
         threatened,  against Borrower or any other Person which might result in
         any  material  adverse  change in  Borrower's  financial  condition  or
         materially and adversely affect  Borrower's  operations,  its assets or
         the Collateral;
                  (N) ERISA.  Borrower has received no notice to the effect that
         it is not in full compliance with any of the requirements of ERISA, and
         the  regulations  promulgated  thereunder  and,  to  the  best  of  its
         knowledge,  there  exists no event  described in Section 4043 of ERISA,
         excluding  subsections  4043(b)(2) and 4043 (b)(3) thereof ("Reportable
         Event"), with respect to Borrower,  and neither Borrower nor any Person
         who is a member of Borrower's controlled group for Federal income


                                       23




         tax purposes has directly or indirectly, caused or permitted any of the
         following   to  occur:   (i)   restated   or   amended   any   pension,
         profit-sharing,  savings,  stock bonus, or other deferred  compensation
         plans established and maintained by it which are subject to ERISA since
         ERISA became  effective with respect to such plans in a manner designed
         to or which would disqualify those plans and their related trusts under
         the applicable  requirements  of the Internal  Revenue Code of 1986, as
         amended (the "IRC");  (ii)  permitted any of its officers to materially
         and  adversely  affect the  qualified  tax-exempt  status of any of its
         pension,  profit-sharing,   savings,  stock  bonus  or  other  deferred
         compensation  plans and  trusts  under  the IRC;  (iii)  engaged  in or
         permitted  any  officer to engage in any  "prohibited  transaction"  as
         defined  in  Section  406 of ERISA  or  Section  4975 of the IRC;  (iv)
         incurred any "accumulated funding deficiency" as defined in Section 302
         of  ERISA or  Section  412(a)  of the IRC,  whether  or not  waived  in
         connection with any pension,  profit-sharing,  savings,  stock bonus or
         other  deferred  compensation  plans;  (v)  taken or failed to take any
         action which caused or may cause a termination of any pension plan in a
         manner which could result in the imposition of a lien on any Borrower's
         property  pursuant  to  Section  4068 of ERISA;  (vi)  failed to notify
         Lender that notice has been received of a "termination"  (as defined in
         ERISA)  of any  "multi-employer  plan" (as  defined  in ERISA) to which
         Borrower has an obligation to  contribute;  (vii)  incurred a "complete
         withdrawal"  (as  defined in ERISA) from any  "multi-employer  plan" to
         which  Borrower has an  obligation  to  contribute;  (viii)  incurred a
         "partial  withdrawal"  (as defined in ERISA)  from any  "multi-employer
         plan" to which Borrower has an obligation to contribute; or (ix) failed
         to notify Lender that notice has been  received from the  Administrator
         of any  "multi-employer  plan" to which  Borrower has an  obligation to
         contribute  that any such plan will be  placed in  "reorganization"  as
         defined in ERISA;
                  (O) Taxes. Borrower has filed all federal, state and local tax
         returns and other reports, or has been included in consolidated returns
         or reports  filed by an Affiliate,  which  Borrower is required by law,
         rule or  regulation  to file and all  Charges  that are due and payable
         have been paid;
                  (P) No Securities.  Borrower's  execution and delivery of this
         Agreement or any of the Ancillary  Agreements  does not directly or, to
         the best  knowledge  of  Borrower,  indirectly  violate  or result in a
         violation  of any  applicable  laws,  rules or  regulations,  including
         without  limitation,  the Securities  Exchange Act of 1934, as amended,
         and  Regulations U, G, T and X of the Board of Governors of the Federal
         Reserve  System  (12 CFR  221,  207,  220 and 224,  respectively),  and
         Borrower  does not own or  intend  to  purchase  or carry  any  "margin
         security," as defined in such Regulations.
                  (Q) Affiliates.  All Persons who are Borrower's  Affiliates at
         this time are identified as such on Exhibit "G" hereto;
                  (R) Subsidiaries.  Exhibit "G" correctly sets forth the names,
         forms  of  legal   entity  and   jurisdictions   of  formation  of  all
         Subsidiaries  of Borrower and all  Subsidiaries  of such  Subsidiaries.
         Except as described in Exhibit "G",  Borrower  does not own any capital
         stock,  partnership  interest,  joint venture  interest or other equity
         interest in any Person.  Unless otherwise indicated in Exhibit "G", all
         of the  outstanding  shares of capital  stock or  partnership  or joint
         venture  interests of each  Subsidiary  of Borrower are owned of record
         and beneficially by Borrower, and all securities and interests so owned
         are duly authorized, validly issued, fully paid, non-


                                       24




         assessable  and  issued in  compliance  with all  applicable  state and
         federal securities and other laws, and are free and clear of all liens.
         Each  Subsidiary  of Borrower is a legal  entity duly  formed,  validly
         existing and in good  standing  under the laws of its  jurisdiction  of
         formation,  is duly qualified or registered to transact business and is
         in good  standing  in each  jurisdiction  in which the  conduct  of its
         business  or the  ownership  or  leasing of its  properties  makes such
         qualification  or  registration  necessary and has all requisite  legal
         power and  authority  to conduct its  business and to own and lease its
         properties.  Each Subsidiary of Borrower is in compliance with all laws
         and other legal requirements  applicable to its business,  has obtained
         all authorizations,  consents,  approvals, orders, licenses and permits
         from,   and   has   accomplished   all   filings,   registrations   and
         qualifications  with, or obtained  exemptions from any of the foregoing
         from, any governmental agency that are necessary for the transaction of
         its business.
                  (S) Environmental Matters. (i) The operations of Borrower, any
         other  obligor  and  each  of  Borrower's  Subsidiaries  comply  in all
         material respects with all applicable  Environmental Laws; (ii) none of
         the  operations  of Borrower,  any other  obligor or any  Subsidiary of
         Borrower  are  subject to any  judicial  or  administrative  proceeding
         alleging the  violation of any  Environmental  Laws;  (iii) none of the
         operations of Borrower, any other obligor or any Subsidiary of Borrower
         is the subject of any federal or state investigation evaluating whether
         any remedial  action is needed to respond to a release of any Hazardous
         Material into the environment; (iv) none of Borrower, any other obligor
         or any Subsidiary of Borrower has filed any notice under any federal or
         state law indicating past or present treatment,  storage or disposal of
         a  Hazardous  Material  or  reporting a spill or release of a Hazardous
         Material  into the  environment;  and (v) none of  Borrower,  any other
         obligor or any Subsidiary of Borrower has any known material contingent
         liability in connection with any release of any Hazardous Material into
         the environment. The materiality standard used in this Section shall be
         exceeded  if the  facts  giving  rise to a breach  or  breaches  of the
         representations   or  warranties   contained  herein  might  result  in
         liability in excess of Two Hundred Fifty Thousand Dollars ($250,000) in
         the aggregate.
                  (T) No Broker's Fee. No brokerage,  finder's or similar fee or
         commission  is due to any party by reason of  Borrower's  entering into
         this  Agreement  or by reason of any of the  transactions  contemplated
         hereby,  and Borrower shall indemnify and hold Lender harmless from any
         such fees and commissions.  9.2 ACCOUNT WARRANTIES AND REPRESENTATIONS.
         Borrower warrants and represents
that  Lender  may  rely,  in  determining  which  Accounts  listed  on any Daily
Collateral Report are Eligible Accounts, without independent  investigation,  on
all  statements,  warranties  and  representations  made by  Borrower on or with
respect to any such Daily Collateral  Report and, unless otherwise  indicated in
writing by Borrower, that
                  (A) Such  Accounts are genuine,  are in all respects what they
         purport to be, are not reduced to a judgment  and, if  evidenced by any
         instrument, item of chattel paper, agreement, contract or document, are
         evidenced by only one  executed  original  instrument,  item of chattel
         paper,  agreement,  contract,  or  document,  which  original  has been
         endorsed and delivered to Lender;
                  (B) Such Accounts represent undisputed, bona fide transactions
         completed in accordance with the terms and provisions  contained in any
         documents related thereto;
                  
                  (C) The amounts shown on the Daily Collateral  Report, and all
         invoices


                                       25




         and  statements  delivered to Lender with  respect to any Account,  are
         actually and  absolutely  owing to Borrower and are not  contingent for
         any reason;
                  (D)  Except  as may be  disclosed  on  such  Daily  Collateral
         Report,  there are no setoffs,  counterclaims  or disputes  existing or
         asserted with respect to any Accounts  included on an Daily  Collateral
         Report, and Borrower has not made any agreement with any Account Debtor
         for any deduction from such Account, except for discounts or allowances
         allowed by Borrower in the  ordinary  course of its business for prompt
         payment,  which  discounts and allowances have been disclosed to Lender
         and are  reflected in the  calculation  of the invoice  related to such
         Account;
                  (E) There are no facts, events or occurrences which in any way
         impair the  validity or  enforcement  of any of the Accounts or tend to
         reduce the amount  payable  thereunder  from the amount of the  invoice
         shown on any Daily Collateral Report and on all contracts, invoices and
         statements delivered to Lender with respect thereto;
                  (F) To the best of Borrower's  knowledge,  all Account Debtors
         are solvent and had the  capacity to contract at the time any  contract
         or  other  document  giving  rise to or  evidencing  the  Accounts  was
         executed;
                  (G) The  goods (if  any),  the sale of which  gave rise to the
         Accounts,  (i) were  produced  in full  compliance  with the Fair Labor
         Standards  Act, 29 U.S.C.  ss.ss.  207 et seq., as amended from time to
         time, and (ii) are not subject to any lien, claim, security interest or
         other  encumbrance,  except  those of  Lender,  and  those  removed  or
         terminated prior to the date hereof;
                  (H)  Borrower  has no  knowledge  of any fact or  circumstance
         which  would  impair  the  validity  or  collectability  of  any of the
         Accounts;
                 (i) To  the  best  of  Borrower's  knowledge,  there  are  no
         proceedings  or actions  which are  threatened  or pending  against any
         Account  Debtor which might result in any  material  adverse  change in
         such Account Debtor's financial condition or business; and
                  (J) The  Accounts  have not been  pledged or sold to any other
         Person  or  otherwise  encumbered  and  Borrower  is the  owner  of the
         Accounts  free of all claims,  liens and  encumbrances  except those of
         Lender.
         9.3 INVENTORY  WARRANTIES AND  REPRESENTATIONS.  Borrower  warrants and
represents  that it does not  produce,  purchase  or sell a  material  amount of
Inventory in the ordinary course of its business.
         9.4  AUTOMATIC   WARRANTY  AND   REPRESENTATION  AND  REAFFIRMATION  OF
WARRANTIES  AND  REPRESENTATIONS.  Each  request for an advance made by Borrower
pursuant to this Agreement or the Ancillary  Agreements  shall constitute (i) an
automatic  warranty and representation by Borrower to Lender that there does not
then exist a Default or an Event of Default and (ii) a  reaffirmation  as of the
date of said request of all of the  warranties and  representations  of Borrower
contained in this Agreement and in the Ancillary Agreements.
         9.5 SURVIVAL OF WARRANTIES  AND  REPRESENTATIONS.  Borrower  covenants,
warrants and  represents to Lender that all  representations  and  warranties of
Borrower contained in this Agreement and the Ancillary  Agreements shall be true
at the  time of  Borrower's  execution  of  this  Agreement  and  the  Ancillary
Agreements, and shall survive the execution,  delivery and acceptance hereof and
thereof by the parties  thereto and the  closing of the  transactions  described
herein and therein or related hereto or thereto.


                                       26




10.      COVENANTS AND CONTINUING AGREEMENTS
         10.1     AFFIRMATIVE COVENANTS.  Borrower covenants that it shall:
                  (A)  Financial  Tests.  Comply  as  of  the  end  of  each  of
         Borrower's  fiscal  quarters with each of the  financial  covenants set
         forth on Schedule 10.1(a) hereto.
                  (B) Bank  Fees.  Pay to Lender,  on demand,  any and all fees,
         costs or expenses  which  Lender or any  Participant  pays to a bank or
         other similar  institution arising out of or in connection with (i) the
         forwarding  to Borrower or any other Person on behalf of  Borrower,  by
         Lender  or any  Participant,  of  proceeds  of loans  or  other  credit
         accommodations  made  by  such  party  to  Borrower  pursuant  to  this
         Agreement  and (ii) the  depositing  for  collection,  by Lender or any
         Participant,  of any check or item of payment  received or delivered to
         such party on account of the Liabilities;
                  (C) Notice of Loss of  Collateral.  Notify Lender  promptly of
         any event or occurrence  causing a material loss or decline in value of
         the  Collateral and the estimated (or actual,  if available)  amount of
         such loss or decline;
                  (D)  Notice  Re  Account  Debtors.  Promptly  upon  Borrower's
         learning thereof, notify Lender of (i) any material delay in Borrower's
         performance of any of its  obligations to any Account Debtor and of any
         assertion  of any claims,  offsets,  defenses or  counterclaims  by any
         Account Debtor and of any allowances or credits granted  (including all
         credits issued for returned or  repossessed  Inventory) or other monies
         advanced  by  Borrower  to any  Account  Debtor  and (ii) all  material
         adverse information relating to the financial or other condition of any
         Account Debtor;
                  (E) Financials. Keep books of account and prepare consolidated
         and  consolidating  financial  statements,  including in such financial
         statements all foreign Companies ("Financials"),  and furnish to Lender
         the  following  (all to be kept and prepared in  accordance  with GAAP,
         unless Borrower's  independent  certified public  accountants concur in
         any changes therein and such changes are disclosed in writing to Lender
         and are consistent with then generally accepted accounting principles):
                          (i)as soon as  available,  but not later than ninety
         (90) days after the close of each fiscal year of 3-D,  consolidated and
         consolidating Financials of 3-D, including in such financial statements
         all foreign  Companies  (including a balance  sheet,  a profit and loss
         statement  and  a  statement  of  cash  flows,   each  with  supporting
         footnotes)  as at the end of such  fiscal  year and for the fiscal year
         then ended all in reasonable  detail as requested by Lender and audited
         by a firm of  independent  certified  public  accountants of recognized
         national  standing  selected by Borrower and containing the unqualified
         opinion of such independent  certified public  accountants with respect
         to the Financials;
                           (ii) as soon as available,  but not later than thirty
         (30) days after the end of each month and each  fiscal  quarter of 3-D,
         unaudited  consolidated and consolidating  Financials of 3-D, including
         in such financial  statements all foreign Companies (including for each
         month a  statement  of profit  and loss for the month  then ended and a
         balance  sheet  as at the  end of  such  month  and,  for  each  fiscal
         quarter-end,  a  statement  of profit and loss and of  surplus  for the
         fiscal quarter then ended, a statement of cash flow, a balance sheet as
         at the end of such quarter,  and a covenant  compliance  certificate in
         the form of Exhibit  "H"  hereto) as at the end of the portion of 3-D's
         fiscal year then  elapsed,  all in  reasonable  detail as  requested by
         Lender and certified by 3-D's principal  financial  officer as prepared
         in accordance with generally accepted accounting  principles and fairly
         presenting the financial


                                       27




         position  and  results  of  operations  of  3-D  and  its  consolidated
         Subsidiaries for such period;
                           (iii) for Borrower, J.R.S. Exploration Company, Ltd.,
         Geoevaluaciones,  S.A. de C.V.,  and Procesos  Interactivos  Avanzados,
         S.A.  de  C.V.,  individually  and in the  aggregate,  (A) as  soon  as
         possible,  but not later than  fifteen  (15) days after the end of each
         month,  an Accounts aging,  and (B) as soon as possible,  but not later
         than  thirty  (30) days  after the end of each  month,  an aging of all
         accounts  payable,  all in reasonable detail as requested by Lender and
         certified by  Borrower's  principal  financial  officer as accurate and
         complete and prepared in accordance with generally accepted  accounting
         principles;
                           (iv)     daily, a Daily Collateral Report;
                           (v) as soon as  available,  but not later  than sixty
         (60)  days  before  the  beginning  of  each  fiscal  year  of  3-D,  a
         consolidated and consolidating income statement, balance sheet and cash
         flow  projection  for 3-D  for  such  fiscal  year,  including  in such
         documentation all foreign Companies, detailed by quarter, together with
         appropriate supporting documents reasonably acceptable to Lender;
                           (vi) promptly after the sending or filing thereof, as
         the case may be, copies of any proxy statements,  financial  statements
         or reports which 3-D has made available to its  shareholders and copies
         of any regular, periodic and special reports or registration statements
         which 3-D files with the  Securities  and  Exchange  Commission  or any
         governmental  authority  which  may  be  substituted  therefor,  or any
         national securities exchange;
                           (Vii) such other data and information  (financial and
         otherwise)  as  Lender,  from  time to time,  may  reasonably  request,
         bearing  upon  or  related  to  the  Collateral,  Borrower's  financial
         condition or results of its operations,  or the financial  condition of
         any Person who is a Guarantor;
                  (F)  Notice  Re  Ineligibility  of  Accounts.   Notify  Lender
         promptly,  but in no event  later  than two (2) days  after  Borrower's
         learning  thereof,  that  any  Eligible  Account  has  ceased  to be an
         Eligible Account and the reason(s) for such ineligibility;
                  (G)  Notice  Re  Litigation.   Notify  Lender,  promptly  upon
         Borrower's  learning of (i) any  litigation  affecting  Borrower if the
         claim is in excess of $250,000,  whether or not the claim is considered
         by Borrower to be covered by insurance; and (ii) the institution of any
         suit or  administrative  proceeding  which may materially and adversely
         affect the operations,  financial  condition or business of Borrower or
         which may affect Lender's security interest in the Collateral;
                  (H) Copies of  Agreements.  Provide  Lender with copies of all
         leases  with a duration  in excess of six months or similar  agreements
         between  Borrower and any Person,  whether Borrower is lessor or lessee
         thereunder,  and, upon request  provide Lender with copies of any other
         leases,  licenses,  permits or similar agreement relative to Borrower's
         business;
                 (i)Notice of Default.  Notify Lender,  promptly upon learning
         thereof, of any Default or Event of Default;
                  (J)  Environmental  Matters.  Give  written  notice  to Lender
         immediately  upon  receipt of any  notice  that (i) the  operations  of
         Borrower,  any other  obligor or any  Subsidiary of Borrower are not in
         full compliance with  requirements  of applicable  Environmental  Laws;
         (ii)  Borrower,  any other  obligor or any  Subsidiary  of  Borrower is
         subject to any federal or state  investigation  evaluating  whether any
         remedial  action is needed to respond to the  release of any  Hazardous
         Material into the environment;


                                       28




         or (iii) any properties or assets of Borrower, any other obligor or any
         Subsidiary  of Borrower are subject to an  Environmental  Lien. As used
         herein,  "Environmental Lien" means a lien in favor of any governmental
         entity  for (A) any  liability  under any  Environmental  Laws,  or (B)
         damages arising from or costs incurred by such  governmental  entity in
         response to a release of a  Hazardous  Material  into the  environment.
         Without  limiting the generality of any of Borrower's  other  covenants
         and agreements,  the operations of Borrower, any other obligor and each
         of  Borrower's  Subsidiaries  shall at all times comply in all material
         respects  with  all  applicable  Environmental  Laws  and  post-testing
         procedures  and  requirements.  The  materiality  standard used in this
         Section  shall be  exceeded  if the  facts  giving  rise to a breach or
         breaches of the covenant  contained herein might result in liability in
         excess of Two Hundred Fifty Thousand Dollars  ($250,000) the aggregate;
         and
                  (K)  Guaranty.  Provide  Lender  with and  maintain  in effect
         continuing  guaranties  in form and  substance  satisfactory  to Lender
         ("Guaranties")  and  executed by each of the  following  Affiliates  of
         Borrower:  3-D; 3-D Geophysical of Latin America, Inc., a Cayman Island
         company;  J.R.S.  Exploration  Company,  Ltd.,  a  Canada  corporation;
         Geoevaluaciones,   S.A.  de  C.V.,  a  Mexico  company;   and  Procesos
         Interactivos Avanzados, S.A. de C.V., a Mexico company. The Guaranty of
         3-D shall be secured by a perfected first priority security interest in
         the  stock of  certain  of the  Companies  and the  Guaranty  of J.R.S.
         Exploration  Company,  Ltd.  shall  be  secured  by a  perfected  first
         priority  security  interest in all of the assets of such  Guarantor in
         each case pursuant to security  agreements,  pledge agreements and such
         other documentation as Lender shall require,  all in form and substance
         satisfactory  to Lender  in its sole  discretion.  Each such  Guarantor
         shall make  representations and warranties similar to those of Borrower
         in this  Agreement,  and  shall  agree  to be bound  by  covenants  and
         agreements  similar to those  applicable to Borrower in this Agreement.
         10.2 NEGATIVE COVENANTS.  Borrower covenants that it shall not, without
         the prior
written  consent of Lender,  which consent shall be in the discretion of Lender,
reasonably exercised:
                  (A) Merger. Merge or consolidate with or acquire any Person;
                  (B)  Investments.  Other  than in the  ordinary  course of its
         business, make any investment in the securities of any Person;
                  (C) Dividends. Declare or pay dividends upon any of Borrower's
         Stock or make any distribution of Borrower's property or assets or make
         any loans,  advances or extensions of credit to any Person,  including,
         without  limitation,  any  Affiliate,  officer or employee of Borrower;
         provided that Borrower may issue stock dividends upon its Stock so long
         as the same is in accordance  with all applicable  laws and provided no
         Default has occurred;
                  (D) Loans and  Advances.  Make any loans or other  advances of
         money (other than salary) to officers, directors or stockholders of any
         of the Companies,  or permit the annual salary and all other direct and
         indirect  remuneration  (excluding  stock options) to their officers to
         exceed Seven Hundred Thousand Dollars ($700,000)  individually or Three
         Million Five Hundred Thousand Dollars ($3,500,000) in the aggregate; or
         make loans or other  advances  of money to  Affiliates,  except for (i)
         transfers to J.R.S. Exploration Company, Ltd., Geoevaluaciones, S.A. de
         C.V.,  3-  D  Geophysical   of  Latin   America,   Inc.,  and  Procesos
         Interactivos,  S.A.  de C.V.,  not to  exceed  at any time for any such
         Company the outstanding amount of advances


                                       29




         made by Lender  to  Borrower  based on the  Eligible  Accounts  of such
         Company,  (ii) loans by Borrower to the  Companies  described in clause
         (i)  hereof  in excess  of the  amounts  permitted  under  clause  (i),
         provided  that no  Default  or Event of  Default  then  exists or would
         result  from the  making of such  loan,  and (iii) in  addition  to the
         foregoing   entities   described  in  clause  (i),  advances  to  other
         Affiliates,  in an amount for each such Affiliate not to exceed $25,000
         at any  time  outstanding  or  $50,000  in the  aggregate  at any  time
         outstanding for all such Affiliates;
                  (E)  Redemptions.   Redeem,  retire,   purchase  or  otherwise
         acquire, directly or indirectly, any of Borrower's Stock;
                  (F) Change in Business. Make any material change in Borrower's
         capital  structure or in any of its business  objectives,  purposes and
         operations which might in any way adversely affect the repayment of the
         Liabilities;
                  (G)  Affiliate  Transactions.  Except as  provided  in Section
         10.2(d),  above, enter into, or be a party to, any transaction with any
         Affiliate,  director, officer or stockholder of Borrower, except in the
         ordinary  course of and  pursuant  to the  reasonable  requirements  of
         Borrower's  business and upon fair and reasonable terms which are fully
         disclosed to Lender and are no less  favorable  to Borrower  than would
         obtain in a comparable  arm's length  transaction  with a Person not an
         Affiliate, director, officer or stockholder of Borrower;
                  (H) Agreements Re Collateral. Enter into any transaction which
         materially and adversely  affects the Collateral or Borrower's  ability
         to  repay  the  Liabilities  or  permit  or  agree  to  any  extension,
         compromise or settlement or make any change or modification of any kind
         or nature  with  respect  to any  Account,  including  any of the terms
         relating thereto;
                 (i) Guaranty.  Guarantee  or  otherwise,  in any way,  become
         liable with respect to the  obligations  or  liabilities of any Person,
         except  (i)  its   Affiliates'   obligations  to  Lender  and  (ii)  by
         endorsement  of  instruments  or items of  payment  for  deposit to the
         general account of Borrower or for delivery to Lender on account of the
         Liabilities;
                  (J)  Deposits  to  Affiliates.  Except as  provided in Section
         10.2(d), above, make deposits to or withdrawals from any of its deposit
         accounts for the benefit of any Affiliate;
                  (K)  Encumbrances.  Except as  otherwise  expressly  permitted
         herein or in the  Ancillary  Agreements,  encumber,  pledge,  mortgage,
         grant a security interest in, assign,  sell, lease or otherwise dispose
         of or transfer,  whether by sale, merger,  consolidation,  liquidation,
         dissolution, or otherwise, any of Borrower's assets;
                  (L)  Indebtedness  for Borrowed Money.  Incur any Indebtedness
         for  borrowed  money in excess of One  Million  Five  Hundred  Thousand
         Dollars ($1,500,000) during any fiscal year of Borrower, other than the
         Liabilities,  except for  Indebtedness  disclosed on Exhibit "J" hereto
         and except for Indebtedness  which is unsecured and is with Persons who
         execute  and  deliver to Lender (in form and  substance  acceptable  to
         Lender)  subordination  agreements  subordinating  their claims against
         Borrower to the payment of the Liabilities;
                  (M) Capital Expenditures.  Make Capital  Expenditures,  in any
         fiscal year which, in the aggregate,  exceed the greater of (i) Sixteen
         Million  Dollars  ($16,000,000)  or  (ii)  an  amount  equal  to 12% of
         Borrower's  gross  revenues,  not to exceed Twenty Five Million Dollars
         ($25,000,000), or;
                  (N)  Affiliate   Accounts.   Except  as  provided  in  Section
         10.2(d)(i), permit


                                       30




         any  Accounts  owing to Borrower  from any  Affiliate  to be payable on
         terms  which  would  not allow  Borrower  to  demand  payment  upon the
         occurrence of a default;
                  (O) Deposit Accounts.  Open, transfer,  close or change any of
         Borrower's  deposit accounts.  A description of all Borrower's  deposit
         accounts is provided in Schedule 10.2 hereto; or
                  (P) 3-D Stock.  Nothing  herein shall be deemed to prohibit or
         otherwise affect or require consent by Lender to any issuance by 3-D of
         any  stock of 3-D or  options  with  respect  thereto  for any  purpose
         whatsoever,   except  to  consummate  a  merger  or  acquisition.  10.3
         CONTESTING CHARGES. Notwithstanding anything to the contrary herein,
Borrower may dispute any Charges  without  prior payment  thereof,  even if such
non-payment  may cause a lien to  attach to  Borrower's  assets,  provided  that
Borrower shall give Lender prompt notice of such dispute and shall be diligently
contesting the same in good faith and by an appropriate  proceeding and there is
no  danger  of a loss or  forfeiture  of any of the  Collateral  or of  Lender's
priority  position with respect to such Collateral and provided further that, if
the same are  potentially  or actually in excess of Two Hundred  Fifty  Thousand
Dollars  ($250,000) in the aggregate at any time hereafter,  Borrower shall give
Lender  such  additional  collateral  and  assurances  as  Lender,  in its  sole
discretion, deems necessary under the circumstances,  immediately upon demand by
Lender.
         10.4 PAYMENT OF CHARGES.  Subject to the  provisions  of Section  10.3,
Borrower shall pay promptly when due all of the Charges.  In the event Borrower,
at any time or times  hereafter,  shall fail to pay the  Charges or to  promptly
obtain the  satisfaction  of such  Charges,  Borrower  shall  promptly so notify
Lender  thereof and Lender may,  without  waiving or releasing any obligation or
liability of Borrower  hereunder or any Default,  in its  discretion  reasonably
exercised,  at any time or  times  thereafter,  make  such  payment  or any part
thereof,  (but shall not be obligated so to do) or obtain such  satisfaction and
take any other action with respect  thereto  which Lender deems  advisable.  All
sums so paid by Lender and any expenses,  including reasonable  attorneys' fees,
court costs,  expenses and other charges relating  thereto,  shall be payable by
Borrower to Lender upon demand and shall be additional Liabilities.
         10.5  INSURANCE;  PAYMENT OF  PREMIUMS.  At its sole cost and  expense,
Borrower shall (i) keep and maintain the  Collateral  insured for the greater of
original cost or replacement  value of the Collateral  against loss or damage by
fire,  theft,  explosion,  sprinklers and all other hazards and risks in amounts
customary  for  companies  of  similar  size  engaged  in the  same  or  similar
businesses;  (ii) if  applicable,  maintain  product  liability  insurance in an
amount  customary  for the  business  conducted by Borrower  and  acceptable  to
Lender; and (iii) general public liability  insurance in an amount  satisfactory
to  Lender  but in no event  less than Ten  Million  Dollars  ($10,000,000)  per
occurrence,  for bodily injury and property damage. All policies of insurance on
the  Collateral  or  otherwise  required  hereunder  shall be in form and amount
satisfactory  to Lender and with insurers  reasonably  recognized as adequate by
Lender. Borrower shall deliver to Lender a copy of each policy of insurance and,
if  requested,  evidence of payment of all premiums  therefor and shall  deliver
renewals of all such policies to Lender at least thirty (30) days prior to their
expiration  dates.  Such policies of insurance shall contain an endorsement,  in
form and substance  acceptable to Lender,  showing all losses payable to Lender.
Such endorsement shall provide that the insurance  companies will give Lender at
least thirty (30) days' prior notice  before any such policy shall be altered or
canceled and that no act or default of Borrower or any other person shall affect
the right of Lender to recover under such policy in case of loss or damage.


                                       31




Borrower  hereby  directs all insurers  under such  policies to pay all proceeds
payable  thereunder  directly  to Lender.  After the  occurrence  and during the
continuance of a Default,  Borrower irrevocably makes,  constitutes and appoints
Lender  (and  all  officers,  employees  or  agents  designated  by  Lender)  as
Borrower's true and lawful attorney and agent-in-fact for the purpose of making,
settling and adjusting  claims under such policies  (provided  that Lender shall
consult with  Borrower  prior to finally  making,  settling or adjusting  claims
under such  policies),  endorsing the name of Borrower in writing or by stamp on
any check,  draft,  instrument or other item of payment for the proceeds of such
policies and for making all  determinations  and decisions  with respect to such
policies.  If  Borrower  shall fail to obtain or  maintain  any of the  policies
required by this  Section  10.5 or to pay any  premium  relating  thereto,  then
Lender,  without  waiving or  releasing  any  obligation  or default by Borrower
hereunder,  may (but shall be under no  obligation to do so) obtain and maintain
such  policies of insurance and pay such premiums and take any other action with
respect thereto which Lender deems  advisable.  All sums so disbursed by Lender,
including  reasonable  attorneys' fees, court costs,  expenses and other charges
relating  thereto,  shall be payable by Borrower to Lender upon demand and shall
be additional Liabilities.
         10.6 SURVIVAL OF OBLIGATIONS UPON  TERMINATION OF AGREEMENT.  Except as
otherwise  expressly  provided  for in  this  Agreement  and  in  the  Ancillary
Agreements, no termination or cancellation (regardless of cause or procedure) of
this Agreement or the Ancillary Agreements shall in any way affect or impair the
powers,  obligations,  duties,  rights, and liabilities of Borrower or Lender in
any way or respect  relating to any transaction or event occurring prior to such
termination  or  cancellation,  the  Collateral,  or any  of  the  undertakings,
agreements,  covenants,  warranties  and  representations  of Borrower or Lender
contained in this Agreement or the Ancillary Agreements.  All such undertakings,
agreements,   covenants,  warranties  and  representations  shall  survive  such
termination or cancellation.
         10.7 ENVIRONMENTAL  INDEMNITY.  Borrower hereby indemnifies Lender, its
successors  and assignees,  and agrees to hold Lender  harmless from and against
any and all losses,  liabilities,  damages, injuries, costs, expenses and claims
of any and every kind whatsoever (including, without limitation, court costs and
attorneys' fees) which at any time or from time to time may be paid, incurred or
suffered by, or asserted against, Lender for, with respect to, or as a direct or
indirect  result of the  violation  by  Borrower,  any other  obligor  or any of
Borrower's  Affiliates,   of  any  laws,  including  but  not  limited  to,  the
Environmental Laws or any laws or regulations  relating to Hazardous  Materials,
treatment,  storage,  disposal,  generation and  transportation,  air, water and
noise pollution, soil or ground or water contamination, the handling, storage or
release into the environment of Hazardous Materials; or with respect to, or as a
direct or indirect result of the presence on or under,  or the escape,  seepage,
leakage, spillage,  discharge,  emission or release from, properties utilized by
Borrower, any other obligor or any of Borrower's  Subsidiaries in the conduct of
their  respective  business  into or  upon  any  land,  the  atmosphere,  or any
watercourse,  body of water or wetland, of any Hazardous  Materials  (including,
without limitation, any losses, liabilities,  damages, injuries, costs, expenses
or claims asserted or arising under the Environmental  Laws); and the provisions
of and  undertakings and  indemnification  set out in this Section shall survive
the  satisfaction  and payment of the  Liabilities  and the  termination of this
Agreement.
         10.8 CHANGE OF CONTROL.  It is  covenanted  and agreed by Borrower that
3-D shall at all times own 100% of the shares of Borrower's capital stock.
         10.9 REVISIONS OR UPDATES. Should any of the information or disclosures
provided


                                       32




on any of the Schedules or Exhibits  originally  attached hereto become outdated
or incorrect in any material respect,  Borrower promptly shall provide to Lender
such  revisions  or  updates as may be  necessary  or  appropriate  to update or
correct such  Schedule(s)  or  Exhibit(s);  provided  that no such  revisions or
updates shall be deemed to have amended, modified or superseded such Schedule or
Exhibit as originally  attached hereto,  or to have cured any breach of warranty
or  representation  resulting from the inaccuracy or  incompleteness of any such
Schedule  or  Exhibit  unless  and  until  Lender,  in  its  sole  and  absolute
discretion, shall have accepted in writing such revisions or updates.
11.      CONDITIONS PRECEDENT TO CLOSING
                  Lender will not be obligated  to make any  advances  hereunder
unless the following  conditions  precedent have been satisfied as determined by
Lender:
                  (A) Lender shall have  received  landlord  waivers,  mortgagee
         waivers  and  warehouse  agreements  acceptable  to  Lender in its sole
         discretion  from the  owners of such  owned  and  leased  locations  of
         Borrower  with a  duration  in  excess of six  months  as Lender  shall
         determine.  The landlord waivers shall include,  without limitation,  a
         right of Lender to remain on the premises for up to three months;
                  (B) Borrower's  representations  and  warranties  contained in
         this  Agreement  and the  Ancillary  Agreements  shall be  correct  and
         complete;   Borrower   shall  have  performed  and  complied  with  all
         covenants,  agreements,  and  conditions  contained  herein  and in the
         Ancillary  Agreements  which are  required  to have been  performed  or
         complied with; and there shall exist no Default or Event of Default;
                  (C) No material adverse change in the condition, operations or
         prospects,  financial or otherwise,  of any of the Companies shall have
         occurred during the period  commencing with June 30, 1997 and ending on
         the Closing Date ("Interim Period");
                  (D) This  Agreement,  the Guaranties,  all security  documents
         relating to the foregoing  Guaranties,  all other collateral  documents
         and agreements,  promissory notes and other documents,  instruments and
         agreements  required by Lender shall be executed by the parties thereto
         and delivered to Lender in form and substance  acceptable to Lender and
         its counsel;
                  (E)  Borrower  shall have  entered  into one or more  dominion
         account   agreements   with  Lender  and  the  financial   institutions
         maintaining  such  accounts,  all in form and  substance  acceptable to
         Lender;
                  (F) Lender shall have  received  such  opinions of counsel for
         the Companies as Lender may require;
                  (G) Lender shall have  received such  opinions,  if any, as it
         may  require  from  counsel  in Canada  and  Mexico  opining  as to the
         perfection  of Lender's  liens and security  interests in the assets of
         the Companies located in such jurisdictions;
                  (H) Lender  shall  have  received  one or more  pledges of all
         stock of the  Companies  (other than the stock of 3-D),  and shall have
         received the original  stock  certificates  of such Companies with duly
         executed assignments in blank;
                 (i) Lender  shall  have  received   insurance   certificates,
         lender's loss payable endorsements and copies of all insurance policies
         confirming insurance by the Companies in amounts, coverage, form and by
         insurers satisfactory to Lender in its discretion;
                  (J) Lender  shall  have  received  confirmation  that it has a
         first priority  perfected  security interest in the Collateral (and all
         collateral pledged as security for any Guaranty),  subject only to such
         liens and  encumbrances,  if any, as Lender shall have  approved in its
         discretion in writing. Such confirmation shall include, without


                                       33




         limitation, (i) written confirmation from all relevant jurisdictions of
         the filing and priority of  financing  statements  (or similar  foreign
         filings)  covering the Collateral,  and (ii) written  confirmation from
         the United States Patent and Trademark  Office and any other applicable
         federal,  state  and  international  offices  of the  registration  and
         priority of Lender's  lien on all of Borrower's  intellectual  property
         assets;
                  (K) Lender  shall have  received a  certificate  of  corporate
         status with  respect to each  Company,  dated  within 21 calendar  days
         prior to the  Closing  Date,  from the  Secretary  of State (or similar
         foreign  office,  as  applicable)  of such  Company's  jurisdiction  of
         incorporation, which indicates that such Company is in good standing in
         such jurisdiction;
                  (L)  Lender  shall have  received  certificates  of  corporate
         status  indicating  that each Company is in good  standing as a foreign
         corporation,  dated within 21 calendar  days prior to the Closing Date,
         from the Secretary of State (or similar foreign office,  as applicable)
         of each jurisdiction in which the character of such Company's assets or
         the nature of its activities makes such qualification necessary;
                  (M) None of the Companies shall have entered into any material
         commitment  or  material   transaction   during  the  Interim   Period,
         including, without limitation,  transactions for borrowings and capital
         expenditures,  which are not in the ordinary  course of such  Company's
         business;
                  (N) None of the Companies  shall have made any material change
         in its accounting methods or principles during the Interim Period;
                  (O) No materially  advantageous agreement previously in effect
         between any Company and any other  Person  shall have been  terminated,
         modified or declared to be in default during the Interim Period;
                  (P) All  consents  necessary  to permit the secured  financing
         transaction contemplated by this Agreement and the Ancillary Agreements
         to be  consummated  pursuant  to the terms and  conditions  hereof  and
         thereof shall have been obtained;
                  (Q) Lender shall have received a  description  of all employee
         pension  benefit  plans  (if  any) of the  Companies,  and  shall  have
         confirmed that such plans are funded at a level satisfactory to Lender;
                  (R)  During  the  Interim  Period,  there  shall not have been
         instituted  or  threatened in any court or  administrative  forum,  any
         material  litigation  or  proceeding to which any of the Companies is a
         party;
                  (S) Lender shall have  received  evidence  satisfactory  to it
         that no broker's  fee,  finder's fee or similar fee shall be payable by
         any of the  Companies  or by any other Person in  connection  with this
         Agreement;
                  (T) Lender shall have received  copies of all labor  contracts
         (if any) to  which  any of the  Companies  is a  party,  and all  labor
         contracts  (if  any)  necessary  to the  continuation  of the  business
         operations of the Companies shall be in effect on the Closing Date;
                  (U) On the Closing Date, the present fair salable value of the
         assets of  Borrower  shall be  greater  than the total  liabilities  of
         Borrower,  including,  without limitation,  contingent liabilities, and
         Lender  shall be satisfied  that the present fair salable  value of the
         assets of Borrower  will  continue  thereafter  to be greater  than the
         total   liabilities  of  Borrower,   including,   without   limitation,
         contingent liabilities;
                  (v) On  the  Closing  Date  and  after  giving  effect  to the
         financial  accommodations  contemplated  hereunder,  all of the  assets
         supporting the Liabilities  shall be sufficient in value, as determined
         by Lender, to provide Borrower with


                                       34




         (a) minimum excess borrowing  availability  under the Revolving Loan of
         $3,000,000,  and (b)  adequate  working  capital to enable  Borrower to
         profitably operate its business;
                  (W)  Subordination   agreements,   no-offset   agreements  and
         intercreditor  agreements in form and substance satisfactory to Lender,
         shall have been  executed and delivered by the Companies and such other
         parties as Lender deems necessary;
                  (X) During the Interim Period,  Lender or its  representatives
         shall have been given  access at all  reasonable  times to inspect  and
         evaluate the Collateral  (and any collateral  pledged by any Guarantor)
         and the  Companies'  books and records;  and the  Companies  shall have
         provided Lender with all financial and other  information  which Lender
         may have reasonably requested;
                  (Y)  Lender  shall  have  received  satisfactory   information
         regarding   the  lawsuit  by  Capilano   International   Inc.   against
         Geoevaluaciones,  S.A.  de C.V.  ("Geo-Mexico"),  and  Lender  shall be
         satisfied in its sole  discretion  (i) with the likely  outcome to such
         lawsuit,  (ii) that an adverse  outcome with  respect  thereto will not
         have a material adverse affect on 3-D or Geo-Mexico, and (iii) that 3-D
         and Geo-Mexico have adequate cash reserves and contingency plans in the
         event of an adverse outcome to such lawsuit;
                  (Z)  Lender  shall  have  received  (i) the  consolidated  and
         consolidating  third fiscal  quarter  financial  statements of 3-D, and
         (ii) the most recently  prepared  projections of the Companies,  all of
         which  must  be  acceptable  to  Lender  in its  discretion  reasonably
         exercised;
                  (AA) Lender shall be satisfied with the Companies'  procedures
         for verifying job completion;
                  (BB)  Lender  shall  have  received  a  certificate  from  the
         secretary or assistant  secretary  of each Company  certifying  (i) the
         adoption  of  resolutions  by the board of  directors  of such  Company
         authorizing the transactions  contemplated hereby, (ii) the articles or
         certificate of incorporation of such Company,  and (iii) the by-laws of
         such Company; and
                  (CC) Lender shall have  received the Closing Fee and all other
         fees and expenses payable on or prior to the Closing Date.
12.      DEFAULT; RIGHTS AND REMEDIES ON DEFAULT
         12.1 DEFAULT. The occurrence of any one or more of the following events
shall constitute a Default:
                  (A) Borrower fails to pay any part of the Liabilities when due
         or declared due or is in default,  beyond any applicable  grace period,
         in the payment of any other  Indebtedness  in excess of $125,000 in the
         aggregate;
                  (B)  Borrower or any  Guarantor  fails or neglects to perform,
         keep or  observe  any other  term,  provision,  condition  or  covenant
         contained in this  Agreement or in the Ancillary  Agreements,  which is
         required to be performed, kept or observed by Borrower or any Guarantor
         and any such failure or neglect  shall  continue for more than five (5)
         days  from the  date of such  failure  or  neglect,  provided  that the
         foregoing  cure  period  shall not apply to a default  with  respect to
         Section 10.2 hereof;
                  (C) A default shall occur and continue  beyond any  applicable
         grace period under any agreement,  document or  instrument,  other than
         this  Agreement or any of the  Ancillary  Agreements,  now or hereafter
         existing,  to which Borrower is a party if as a result thereof Borrower
         is in default of obligations in excess of $125,000 in the aggregate;
                  (D) Any statement, warranty, representation, report, financial
         statement, or


                                       35




         certificate  made or delivered by Borrower or by any Guarantor,  or any
         of their  officers,  employees  or  agents,  to  Lender is not true and
         correct in any material respect;
                  (E) There  shall  occur any  material  uninsured  damage to or
         loss, theft, or destruction of any of the Collateral;
                  (F) Collateral or any of Borrower's or any  Guarantor's  other
         assets  with an  aggregate  value in excess of $125,000  are  attached,
         seized, levied upon or subjected to a writ or distress warrant, or come
         within the possession of any receiver,  trustee,  custodian or assignee
         for the benefit of creditors and the same is not dismissed or otherwise
         avoided within thirty (30) days  thereafter;  or application is made by
         any Person other than Borrower or any Guarantor for the  appointment of
         a receiver,  trustee,  or custodian for any of the Collateral or any of
         Borrower's  or  any  Guarantor's  other  assets  and  the  same  is not
         dismissed within thirty (30) days after the application therefor;
                  (G) An  application  is made by Borrower or any  Guarantor for
         the  appointment  of a receiver,  trustee or  custodian  for any of the
         Collateral  or any of  Borrower's or any  Guarantor's  other assets;  a
         petition under any section or chapter of the Bankruptcy Code or similar
         law or  regulation  is filed by Borrower or any  Guarantor;  a petition
         under any section or chapter of the  Bankruptcy  Code or similar law or
         regulation  is  filed  against  Borrower  or any  Guarantor  and is not
         dismissed  within  thirty  (30)  days  after  filing;  Borrower  or any
         Guarantor  makes an assignment  for the benefit of its creditors or any
         case or proceeding is filed by or against Borrower or any Guarantor for
         its dissolution, liquidation, or termination; Borrower or any Guarantor
         ceases  to  conduct  its  business  as now  conducted  or is  enjoined,
         restrained or in any way prevented by court order from  conducting  all
         or any material part of its business affairs;
                  (H) Except as  permitted  in Section  10.3,  a notice of lien,
         levy or  assessment  is  filed of  record  with  respect  to all or any
         substantial  portion of  Borrower's  or any  Guarantor's  assets by the
         United States, or any department, agency or instrumentality thereof, or
         by any state, county, municipal or other governmental agency including,
         without limitation,  the Pension Benefit Guaranty  Corporation,  or any
         taxes  or  debts  owing  to any  of the  foregoing  becomes  a lien  or
         encumbrance upon the Collateral or any of Borrower's or any Guarantor's
         other assets and such lien or encumbrance is not released within thirty
         (30) days after its creation;
                 (i)One or more judgments is rendered  against Borrower or any
         Guarantor  in an  aggregate  amount  in  excess  of Two  Hundred  Fifty
         Thousand  Dollars  ($250,000)  or, in the lawsuit  described in Section
         11(y), in excess of Two Million Dollars  ($2,000,000),  and Borrower or
         any  Guarantor,  as  applicable,  fails  to  immediately  satisfy  such
         judgment or fails to bond and stay  enforcement  of such  judgment  and
         commence  appropriate  proceedings  to appeal such judgment  within the
         applicable  appeal  period or, after such appeal is filed,  Borrower or
         any Guarantor, as applicable, fails to diligently prosecute such appeal
         or such appeal is denied;
                  (J)  Borrower  or any  Guarantor  becomes  insolvent  or fails
         generally to pay its debts as they become due;
                  (K)  Borrower   fails  within  fifteen  (15)  days  after  the
         occurrence  of any of the  following  events,  to furnish  Lender  with
         appropriate  notice  thereof:  (i) the happening of a Reportable  Event
         with respect to any profit  sharing or pension  plan  governed by ERISA
         (such notice shall contain the statement of the chief financial


                                       36




         officer of Borrower  setting forth details as to such Reportable  Event
         and the action which Borrower proposes to take with respect thereto and
         a copy of the notice of such  Reportable  Event to the Pension  Benefit
         Guaranty Corporation), (ii) the termination of any such plan, (iii) the
         appointment of a trustee by an appropriate United States District Court
         to administer any such plan, or (iv) the institution of any proceedings
         by the Pension Benefit Guaranty  Corporation to terminate any such plan
         or to appoint a trustee to administer any such plan;
                  (L)  Borrower  fails to: (i)  furnish to Lender a copy of each
         report which is filed by Borrower with respect to any profit sharing or
         pension plan governed by ERISA  promptly  after the filing thereof with
         the Secretary of Labor or the Pension Benefit  Guaranty  Corporation or
         (ii) notify  Lender  promptly upon receipt by Borrower of any notice of
         the  institution of any proceeding or other actions which may result in
         the termination of any such plans;
                  (M) Any Guarantor  revokes or terminates any Guaranty relating
         to any of the  Liabilities  or any document or  agreement  securing the
         same,  or  defaults  under  the  terms  of any such  Guaranty  or other
         agreement beyond any applicable grace period;
                  (N) Any party (other than Lender) to an  intercreditor  and/or
         subordination  agreement  executed in connection  herewith  shall be in
         default thereunder;
                  (O) A  default  occurs  under  any  agreement,  instrument  or
         document relating to any of the Liabilities  heretofore,  now or at any
         time or times hereafter executed by, or delivered to Lender by Borrower
         or by any Guarantor.  12.2  ACCELERATION OF THE  LIABILITIES.  Upon and
         after the occurrence of a Default,
all of the Liabilities may, at the option of Lender and without demand,  notice,
or legal process of any kind, be declared, and immediately shall become, due and
payable.
         12.3  ADVANCES  DURING CURE PERIOD.  Upon the  occurrence  of a Default
which is subject to any cure period,  Lender may, in its sole discretion,  cease
making further advances during the time such Default remains uncured.
         12.4 DEFAULT RATE.  Upon the  occurrence of a Default,  the Loans shall
bear  interest at a Default Rate equal at all times to three  percent (3%) above
the Prime Rate-based  interest rates provided for such Loans,  such Default rate
to begin upon the  occurrence  of the Default and to be adjusted upon any change
in the Prime Rate as provided herein.
         12.5 REMEDIES. Upon and after the occurrence of a Default, Lender shall
have all of the following rights and remedies:
                  (a) All of the default  rights and remedies of a secured party
         under the California  Commercial Code or any other  applicable law, all
         of which rights and remedies shall be cumulative, and not exclusive, to
         the extent  permitted  by law and in addition  to any other  rights and
         remedies  contained  in  this  Agreement  and in  any of the  Ancillary
         Agreements;
                  (b) The right to (i)  peacefully  enter upon the  premises  of
         Borrower or any other place or places where the  Collateral is located,
         without any  obligation  to pay rent to  Borrower or any other  Person,
         through  self-help and without  judicial  process or first  obtaining a
         final judgment or giving  Borrower notice and opportunity for a hearing
         on the validity of Lender's claim,  and remove the Collateral from such
         premises  and places to the  premises of Lender or any agent of Lender,
         for such time as  Lender  may  require  to  collect  or  liquidate  the
         Collateral,  and/or (ii)  require  Borrower to assemble and deliver the
         Collateral to Lender at a place to be designated by Lender;
                  (c) The right to (i) open  Borrower's mail and collect any and
         all amounts


                                       37




         due from Account  Debtors or direct that Borrower's mail be diverted to
         a post  office box or other  location  as  determined  by Lender,  (ii)
         notify  Account  Debtors that the Accounts have been assigned to Lender
         and that Lender has a security  interest  therein and (iii) direct such
         Account  Debtors to make all payments due from them upon the  Accounts,
         including the Special  Collateral,  directly to Lender or to a lock box
         designated by Lender.  Lender shall  promptly  furnish  Borrower with a
         copy of any such notice sent and Borrower  hereby  agrees that any such
         notice,   in  Lender's  sole  discretion,   may  be  sent  on  Lender's
         stationery,  in which event, Borrower shall, upon demand,  co-sign such
         notice with Lender;
                  (d) The right to sell, lease or to otherwise dispose of all or
         any   Collateral   in  its  then   condition,   or  after  any  further
         manufacturing  or  processing  thereof,  at public or  private  sale or
         sales, in lots or in bulk, for cash or on credit, all as Lender, in its
         sole discretion,  may deem advisable.  At any such sale or sales of the
         Collateral,  the  Collateral  need not be in view of those  present and
         attending the sale, nor at the same location at which the sale is being
         conducted.  Lender  shall  have the  right  to  conduct  such  sales on
         Borrower's  premises  or  elsewhere  and  shall  have the  right to use
         Borrower's  premises  without  charge  for such  sales for such time or
         times as Lender  may see fit.  Lender is  hereby  granted a license  or
         other  right  to  use,  without  charge,  Borrower's  labels,  patents,
         copyrights,  rights of use of any name,  trade  secrets,  trade  names,
         trademarks and advertising matter, or any property of a similar nature,
         as it pertains to the  Collateral,  in advertising for sale and selling
         any  Collateral  and  Borrower's  rights  under  all  licenses  and all
         franchise  agreements  shall inure to Lender's benefit but Lender shall
         have no obligations thereunder.  Lender may purchase all or any part of
         the Collateral at public or, if permitted by law,  private sale and, in
         lieu of actual payment of such purchase price, may setoff the amount of
         such price against the Liabilities. The proceeds realized from the sale
         of any  Collateral  shall be applied  first to the costs,  expenses and
         attorneys' fees and expenses  incurred by Lender for collection and for
         acquisition,   completion,   protection,  removal,  storage,  sale  and
         delivery  of the  Collateral;  second to  interest  due upon any of the
         Liabilities;  and third to the  principal  of the  Liabilities.  Lender
         shall  account to Borrower for any  surplus.  If any  deficiency  shall
         arise,  Borrower shall remain liable to Lender  therefor.  12.6 NOTICE.
         Borrower agrees that any notice required to be given by Lender of a
sale, lease, or other disposition of any of the Collateral or any other intended
action  by  Lender,  which  is  personally  delivered  to  Borrower  or which is
deposited  in the United  States  mail,  postage  prepaid and duly  addressed to
Borrower at the address set forth in Section 13.10, at least five (5) days prior
to any such public sale, lease or other disposition or other action being taken,
or the time after which any private sale of the Collateral is to be held,  shall
constitute commercially reasonable and fair notice thereof to Borrower.
13.0     MISCELLANEOUS
         13.1  APPOINTMENT  OF LENDER  AS  BORROWER'S  LAWFUL  ATTORNEY-IN-FACT.
Borrower,  irrevocably designates,  makes,  constitutes and appoints Lender (and
all persons  designated  by Lender) as Borrower's  true and lawful  attorney and
agent-in-fact  (this power of attorney is coupled with an interest)  and Lender,
or Lender's agent, may, without notice to Borrower:
                  (a) At any time  hereafter,  for the  purpose  of  protecting,
         preserving or collecting  the  Collateral,  endorse by writing or stamp
         Borrower's  name on any  checks,  notes,  drafts or any  other  payment
         relating to the Collateral which comes into


                                       38




         the possession of Lender or under Lender's control and deposit the same
         to the account of Lender for application to the Liabilities;
                  (b) At any time after the  occurrence  of an uncured  Event of
         Default,  in Borrower's  or Lender's  name:  (i) demand  payment of the
         Collateral;   (ii)  enforce  payment  of  the   Collateral,   by  legal
         proceedings or otherwise;  (iii) exercise all of Borrower's  rights and
         remedies with respect to the collection of the Collateral; (iv) settle,
         adjust,  compromise,  extend  or renew  the  Accounts  and the  Special
         Collateral;  (v) settle,  adjust or  compromise  any legal  proceedings
         brought to collect the Collateral; (vi) if permitted by applicable law,
         sell or assign the Collateral upon such terms,  for such amounts and at
         such time or times as Lender deems advisable; (vii) satisfy and release
         the  Accounts  and  Special  Collateral;  (viii) take  control,  in any
         manner,  of any item of payment or proceeds referred to in Section 4.3;
         (ix) prepare,  file and sign  Borrower's  name on any proof of claim in
         Bankruptcy or similar document against any Account Debtor; (x) prepare,
         file and sign  Borrower's  name on any  notice of lien,  assignment  or
         satisfaction  of  lien or  similar  document  in  connection  with  the
         Collateral;  (xi) do all acts and things  necessary,  in Lender's  sole
         discretion,  to fulfill  Borrower's  obligations  under this Agreement;
         (xii) endorse by writing or stamp the name of Borrower upon any chattel
         paper, document,  instrument,  invoice, freight bill, bill of lading or
         similar  document or agreement  relating to the Collateral;  and (xiii)
         use the  information  recorded on or contained  in any data  processing
         equipment and computer hardware and software relating to the Collateral
         to which Borrower has access;  provided that,  upon  Borrower's cure of
         any  Default  or Event  of  Default,  Lender  shall  have the  right to
         complete any action commenced by it as attorney or agent-in-fact  while
         such Default or Event of Default was continuing; and
                  (c) At any time  after the  occurrence  of an Event of Default
         notify the post office  authorities  to change the address for delivery
         of Borrower's mail to an address designated by Lender and receive, open
         and dispose of all mail addressed to Borrower.
         13.2   MODIFICATION OF AGREEMENT; ASSIGNMENT OR SALE OF INTEREST.  This
Agreement and the Ancillary Agreements may not be modified,  altered or amended,
except by an  agreement in writing  signed by Borrower and Lender.  Borrower may
not sell,  assign or transfer this Agreement or the Ancillary  Agreements or any
portion hereof or thereof,  including,  without  limitation,  Borrower's  right,
title, interest,  remedies, powers, or duties hereunder or thereunder.  Borrower
hereby consents to Lender's participation,  sale, assignment,  transfer or other
disposition,  at any time or times hereafter, of this Agreement or the Ancillary
Agreements or of any portion hereof or thereof,  including,  without limitation,
Lender's  right,  title,  interest,  remedies,  powers,  or duties  hereunder or
thereunder.
         13.3 ATTORNEYS' FEES AND EXPENSES; LENDER'S OUT-OF-POCKET EXPENSES. If,
at any time or  times,  whether  prior or  subsequent  to the  date  hereof  and
regardless of the  existence of a Default or an Event of Default,  Lender incurs
legal or other costs and  expenses or employs  counsel,  accountants,  advisors,
consultants  and/or other  professionals  for advice or other  representation or
services in connection with:
                  (a) The preparation, negotiation, execution and administration
         of this  Agreement,  all  Ancillary  Agreements,  any  amendment  of or
         modification of this Agreement or the Ancillary  Agreements or any sale
         or  attempted  sale  of  any  interest  herein  to  a  co-lender  or  a
         Participant; or consultation with counsel in connection with any of the
         foregoing or any of the items listed in clauses (b) through (e) of this


                                       39




         Section 13.3;
                  (b) Any  litigation,  contest,  dispute,  suit,  proceeding or
         action (whether instituted by Lender,  Borrower or any other Person) in
         any way  relating to the  Collateral,  this  Agreement,  the  Ancillary
         Agreements or Borrower's affairs;
                  (c) Any  attempt  to  enforce  any  rights  of  Lender  or any
         Participant against Borrower or any other Person which may be obligated
         to  Lender or such  Participant  by  virtue  of this  Agreement  or the
         Ancillary  Agreements,   including,  without  limitation,  the  Account
         Debtors;
                  (d) Any attempt to inspect,  verify,  protect,  collect, sell,
         liquidate or otherwise dispose of any of the Collateral; or
                  (e)  Any  inspection,  verification,  protection,  collection,
         sale,  liquidation  or  other  disposition  of any  of the  Collateral,
         including  without  limitation,  Lender's periodic or special audits of
         Borrower's books and records;
then, in any such event,  the  reasonable  attorneys' and  paralegals'  fees and
expenses arising from such services and all reasonably incurred expenses, costs,
charges  and other  fees of or paid by Lender in any way or  respect  arising in
connection  with or relating to any of the events or actions  described  in this
Section  shall be  payable  by  Borrower  to  Lender  upon  demand  and shall be
additional Liabilities.  Without limiting the generality of the foregoing,  such
expenses,   costs,   charges  and  fees  may  include  bank  charges  and  fees,
accountants'  fees,  costs  and  expenses,   court  costs,  fees  and  expenses,
photocopying and duplicating expenses,  court reporter fees, costs and expenses,
long  distance  telephone  charges,  air  express  charges,   telegram  charges,
secretarial over-time charges, and expenses for travel, lodging and food paid or
incurred in connection with the performance of all such services.
         13.4  WAIVER  BY  LENDER.  Lender's  failure,  at  any  time  or  times
hereafter,  to require  strict  performance by Borrower of any provision of this
Agreement or the Ancillary  Agreements shall not constitute a waiver,  or affect
or diminish  any right of Lender  thereafter  to demand  strict  compliance  and
performance  herewith  or  therewith.  Any  suspension  or waiver by Lender of a
Default  under this  Agreement or the  Ancillary  Agreements  shall not suspend,
waive or  affect  any  other  Default  under  this  Agreement  or the  Ancillary
Agreements,  whether the same is prior or subsequent  thereto and whether of the
same or of a different type. None of the undertakings,  agreements,  warranties,
covenants and  representations  of Borrower  contained in this  Agreement or the
Ancillary  Agreements  and no Default  under  this  Agreement  or the  Ancillary
Agreements  shall be deemed to have been  suspended or waived by Lender,  unless
such suspension or waiver is by an instrument in writing signed by an officer of
Lender and directed to Borrower specifying such suspension or waiver.
         13.5 SEVERABILITY.  Wherever possible, each provision of this Agreement
and the  Ancillary  Agreements  shall be  interpreted  in such  manner  as to be
effective and valid under applicable law, but if any provision of this Agreement
or the Ancillary  Agreements  shall be prohibited by or invalid under applicable
law, such provision  shall be  ineffective to the extent of such  prohibition or
invalidity,  without  invalidating  the  remainder  of  such  provision  or  the
remaining provisions of this Agreement or the Ancillary Agreements.
         13.6  PARTIES;  ENTIRE  AGREEMENT.  This  Agreement  and the  Ancillary
Agreements  shall be binding  upon and inure to the  benefit  of the  respective
successors and assigns of Borrower and Lender. Borrower's successors and assigns
shall include, without limitation,  a trustee,  receiver or debtor-in-possession
of or for Borrower.  Nothing contained in this Section shall be deemed to modify
Section 13.2.  This Agreement is the complete  statement of the agreement by and
between Borrower and Lender and supersedes all prior negotiations,


                                       40




understandings  and  representations  between  them with  respect to the subject
matter of this Agreement.
         13.7 CONFLICT OF TERMS. The provisions of the Ancillary  Agreements are
incorporated in this Agreement by this reference.  Except as otherwise  provided
in this Agreement and except as otherwise  provided in the Ancillary  Agreements
by specific  reference to the  applicable  provision of this  Agreement,  if any
provision contained in this Agreement is in conflict with, or inconsistent with,
any  provision  in any  Ancillary  Agreement,  the  provision  contained in this
Agreement shall govern and control.
         13.8  WAIVER BY  BORROWER.  Except as  otherwise  provided  for in this
Agreement,  Borrower  waives  (a)  presentment,  demand and  protest,  notice of
protest,  notice  of  presentment,  default,  non-payment,   maturity,  release,
compromise,  settlement,  extension or renewal of any or all  commercial  paper,
accounts, contract rights, documents,  instruments, chattel paper and guaranties
at any time held by Lender on which Borrower may in any way be liable and hereby
ratifies  and  confirms  whatever  Lender may do in this  regard;  (b) except as
otherwise  provided by applicable  law, all rights to notice and a hearing prior
to Lender's taking possession or control of, or to Lender's replevy,  attachment
or levy upon,  the Collateral or any bond or security which might be required by
any court prior to allowing Lender to exercise any of Lender's remedies; and (c)
except as otherwise  provided by applicable  law, the benefit of all  valuation,
appraisement,  extension and exemption laws.  Borrower  acknowledges that it has
been  advised  by its  own  counsel  with  respect  to  this  Agreement  and the
transactions  evidenced  by this  Agreement.  Borrower  further  agrees that (y)
Lender  shall  have no  obligation  to take,  and  Borrower  shall have the sole
responsibility  for taking, any and all steps to preserve rights against any and
all Account  Debtors and against any and all prior parties to any note,  chattel
paper,  draft,  trade  acceptance,  or other instrument for the payment of money
covered by the security  interest whether or not in Lender's  possession and (z)
Lender shall not be  responsible  to Borrower for loss or damage  resulting from
Lender's  failure to enforce  any  Accounts  or to collect  any moneys due or to
become due thereunder or other proceeds constituting Collateral hereunder unless
such  loss  or  damage  results  from  Lender's  gross   negligence  or  willful
misconduct.
         13.9  GOVERNING  LAW,  VENUE.  This  Agreement  has been  delivered for
acceptance by Lender in Los Angeles County,  California and shall be governed by
and construed in accordance  with the internal laws (as opposed to the conflicts
of law  provisions) of the State of California as the same may from time to time
be in effect,  including  without  limitation  the  Uniform  Commercial  Code as
adopted  in  California.   Borrower  hereby  (a)  irrevocably   submits  to  the
jurisdiction  of any state or  federal  court  located  in Los  Angeles  County,
California over any action or proceeding to enforce or defend any matter arising
from or related to this Agreement;  (b) waives  personal  service of any and all
process upon Borrower,  and consents that all such service of process be made by
messenger, certified mail or registered mail directed to Borrower at the address
set forth in Section  13.10 and service so made shall be deemed to be  completed
upon the  earlier of actual  receipt or three (3) days after the same shall have
been posted to Borrower's address; (c) irrevocably waives, to the fullest extent
Borrower  may  effectively  do so, the defense of an  inconvenient  forum to the
maintenance of any such action or  proceeding;  (d) agrees that a final judgment
in any such action or proceeding  shall be conclusive and may be enforced in any
other  jurisdictions  by suit on the judgment or in any other manner provided by
law; and (e) agrees not to  institute  any legal  action or  proceeding  against
Lender or any of Lender's directors,  officers,  employees,  agents or property,
concerning  any matter arising out of or relating to this Agreement in any court
other than one located in Los Angeles County, California. Nothing


                                       41




in this Section shall affect or impair  Lender's right to serve legal process in
any manner  permitted by law or Lender's right to bring any action or proceeding
against Borrower or Borrower's property in the courts of any other jurisdiction.
         13.10 NOTICE.  Except as otherwise  provided herein or in the Ancillary
Agreements:
                  (a) All  notices,  requests,  demands,  directions  and  other
         communications  provided  for  hereunder  or under any other  Ancillary
         Agreement  must  be in  writing  and  must  be  mailed,  telecopied  or
         delivered to the  appropriate  party at the address set forth below or,
         as to any party  hereto  or to any  Ancillary  Agreement,  at any other
         address  as may be  designated  by it in a written  notice  sent to all
         other parties in accordance with this Section; and
                  (b)  Any  notice,   request,   demand,   direction   or  other
         communication  given by telecopier will be confirmed within 48 hours by
         letter mailed or delivered to the  appropriate  party at its respective
         address.  Except  as  otherwise  expressly  provided  herein  or in any
         Ancillary Agreement, if any notice, request, demand, direction or other
         communication  required or permitted  by any Loan  Document is given by
         mail it will be  effective  on the  earlier  of  receipt  or the  third
         calendar day after  deposit in the United  States mail with first class
         or airmail postage  prepaid;  if given by telecopier,  when sent; or if
         given by personal delivery, when delivered.
                  If to Lender, at:
                  Sanwa Business Credit Corporation
                  550 North Brand Boulevard, Suite 950
                  Glendale, California 91203
                  Attn:  Region Manager
                  Telephone:  (818) 545-0090
                  Telecopier:  (818) 545-0095


                  If to Borrower, at:
                  Northern Geophysical of America, Inc.
                  8226 Park Meadows Drive
                  Littleton, Colorado  80124
                  Attn:  Ronald L. Koons, Vice President & C.F.O.
                  Telephone:  (303) 858-0500
                  Telecopier:  (303) 708-8941
                  Tax Identification Number:  133869239


         13.11 SECTION  TITLES,  ETC.. The Section titles and table of contents,
if any, contained in this Agreement are and shall be without substantive meaning
or content of any kind  whatsoever  and are not a part of the agreement  between
the parties hereto. All references herein to Sections,  paragraphs,  clauses and
other subdivisions refer to the corresponding Sections,  paragraphs, clauses and
other  subdivisions  of  this  Agreement;  and  the  words  "herein",  "hereof",
"hereby",  "hereto",  "hereunder",  and words of  similar  import  refer to this
Agreement as a whole and not to any  particular  Section,  paragraph,  clause or
subdivision hereof. All Exhibits which are referred to herein or attached hereto
are hereby incorporated by reference.
         13.12  COURSE OF  DEALING.  No course of  dealing  between  Lender  and
Borrower or


                                       42




any third party and no delay or omission  by Lender in  exercising  any right or
remedy  hereunder  or under  any  Ancillary  Agreement  or with  respect  to any
Liabilities  shall operate as a waiver  thereof or of any other right or remedy,
and no single or partial  exercise  thereof shall  preclude any other or further
exercise  thereof or the  exercise of any other right or remedy.  All rights and
remedies of Lender are cumulative.

         13.13  SETOFF.  Without  limiting  any other right of Lender,  whenever
Lender  has the right to  declare  any  Liabilities  to be  immediately  due and
payable  (whether or not it has so  declared),  Lender at its sole  election may
setoff  against the  Liabilities  any and all monies then or thereafter  owed to
Borrower  by Lender  in any  capacity,  whether  or not the  Liabilities  or the
obligation  to pay such monies owed by Lender is then due,  and Lender  shall be
deemed to have  exercised  such right of setoff  immediately at the time of such
election even though any charge therefor is made or entered on Lender's  records
subsequent thereto.

         13.14 NONLIABILITY OF LENDER. Borrower acknowledges and agrees that:

                  (a) Any  inspections  of any  Collateral  made  by or  through
         Lender are for purposes of  administration  of advances made  hereunder
         only and Borrower is not entitled to rely upon the same;

                  (b)  By  accepting  or  approving   anything  required  to  be
         observed,  performed,  fulfilled  or given to Lender  pursuant  to this
         Agreement or the  Ancillary  Agreements,  Lender shall not be deemed to
         have warranted or represented the sufficiency,  legality, effectiveness
         or legal  effect of the same,  or of any term,  provision  or condition
         thereof, and such acceptance or approval thereof shall not constitute a
         warranty or representation to anyone with respect thereto by Lender;

                  (c) The relationship between Borrower and Lender is, and shall
         at all times remain, solely that of a borrower and lender; Lender shall
         not under  any  circumstance  be  construed  to be a  partner  or joint
         venturer of Borrower; Lender shall not under any circumstance be deemed
         to be in a  fiduciary  relationship  with  Borrower;  Lender  does  not
         undertake or assume any  responsibility  or duty to Borrower to select,
         review,  inspect,  supervise,  pass judgment upon or inform Borrower of
         any  matter  in  connection  with its  property  or the  operations  of
         Borrower;  Borrower  shall rely  entirely  upon its own  judgment  with
         respect  to such  matters;  and any  review,  inspection,  supervision,
         exercise of judgment or supply of information  undertaken or assumed by
         Lender in connection  with such matters is solely for the protection of
         Lender and neither  Borrower  nor any other  Person is entitled to rely
         thereon; and

                  (d) Lender  shall not be  responsible  or liable to any Person
         for any loss, damage, liability or claim of any kind relating to injury
         or death to such Persons or damage to property not caused by Lender and
         caused by the actions,  inaction or negligence of Borrower and Borrower
         hereby  indemnifies  and  holds  Lender  harmless  from any such  loss,
         damage, liability or claim.

         13.15 TIME OF THE ESSENCE.  Time is of the essence  hereunder and under
the Ancillary Agreements.

         13.16    INDEMNIFICATION.


                                       43




         If after receipt of any payment of all or any part of the Indebtedness,
Lender is for any reason  compelled  to  surrender  such  payment to any Person,
because  such  payment is  determined  to be void or voidable  as a  preference,
impermissible  setoff,  or a diversion of trust funds,  or for any other reason,
this Agreement shall continue in full force and Borrower shall be liable to, and
shall  indemnify  and hold  Lender  harmless  for,  the  amount of such  payment
surrendered.  The  provisions  of this  Section  shall be and  remain  effective
notwithstanding  any  contrary  action  which may have  been  taken by Lender in
reasonable  reliance  upon such payment,  and any such contrary  action so taken
shall be without  prejudice to Lender's rights under this Agreement and shall be
deemed to have  been  conditioned  upon such  payment  having  become  final and
irrevocable.  The  provisions of this Section shall survive the  termination  of
this Agreement.

         Borrower  agrees to indemnify,  save and hold  harmless  Lender and its
directors,   officers,   agents,   attorneys  and  employees  (collectively  the
"Indemnitees")  from and against:  (i) Any and all claims,  demands,  actions or
causes of action that are asserted  against any  Indemnitee by any Person if the
claim,  demand,  action or cause of action  directly or indirectly  relates to a
claim, demand,  action or cause of action that such Person asserts or may assert
against  Borrower,  or any Affiliate or any officer,  director or shareholder of
Borrower  and such  claim,  demand,  action or cause of action  arises out of or
relates to this  Agreement or the Ancillary  Agreements,  the use of proceeds of
any advance,  or the  relationship  of Borrower and Lender under this Agreement;
(ii) Any and all  claims,  demands,  actions  or causes of action if the  claim,
demand,  action  or cause of  action  arises  out of or  relates  to  Borrower's
compliance or  noncompliance  with the  requirements of any  environmental  law;
(iii) Any administrative or investigative  proceeding by any governmental agency
arising  out of or  related  to a claim,  demand,  action  or  cause  of  action
described  in  clauses  (i) or (ii)  above;  and (iv)  Any and all  liabilities,
losses,   costs  or  expenses   (including   reasonable   attorneys'   fees  and
disbursements and other  professional  services) that any Indemnitee  suffers or
incurs as a result of the assertion of any foregoing  claim,  demand,  action or
cause  of  action;   provided   that  no   Indemnitee   shall  be   entitled  to
indemnification  for any loss  caused by its own  gross  negligence  or  willful
misconduct.  Each Indemnitee is authorized to employ counsel of its own choosing
in enforcing its rights  hereunder and in defending  against any claim,  demand,
action or cause of action covered by this Section; provided that each Indemnitee
shall endeavor, in connection with any matter covered by this Section which also
involves  other  Indemnitees,  to use  reasonable  efforts to avoid  unnecessary
duplication of effort by counsel for all Indemnitees. Whenever practicable, upon
obtaining  actual  knowledge  of any  event  that  would  entitle  Lender  to be
indemnified  under this  Section,  Lender  shall  endeavor to provide  notice to
Borrower of such fact and Lender shall  cooperate  with  Borrower to endeavor to
minimize the  liabilities  for which Lender is entitled to be  indemnified.  Any
obligation or liability of Borrower to any  Indemnitee  under this Section shall
survive the expiration or termination of this Agreement and the repayment of all
Liabilities and the payment and performance of all other  obligations under this
Agreement owed to Lender.

         13.17 WAIVER OF RIGHT TO TRIAL BY JURY.  THE PARTIES TO THIS  AGREEMENT
ACKNOWLEDGE  THAT JURY TRIALS  OFTEN ENTAIL  ADDITIONAL  EXPENSES AND DELAYS NOT
OCCASIONED BY NONJURY TRIALS.  THE PARTIES TO THIS AGREEMENT AGREE AND STIPULATE
THAT A FAIR TRIAL MAY BE HAD BEFORE A STATE OR FEDERAL JUDGE IN A COURT BY MEANS
OF A BENCH


                                       44




TRIAL WITHOUT A JURY. IN VIEW OF THE FOREGOING, AND AS A SPECIFICALLY NEGOTIATED
PROVISION  OF THIS  AGREEMENT,  EACH PARTY TO THIS  AGREEMENT  HEREBY  EXPRESSLY
WAIVES  ANY  RIGHT TO TRIAL BY JURY OF ANY  CLAIM,  DEMAND,  ACTION  OR CAUSE OF
ACTION  ARISING  UNDER  THIS  AGREEMENT  OR ANY OTHER  INSTRUMENT,  DOCUMENT  OR
AGREEMENT EXECUTED OR DELIVERED IN CONNECTION HEREWITH,  OR IN ANY WAY CONNECTED
WITH OR RELATED OR INCIDENTAL TO THE DEALINGS OF THE PARTIES HERETO WITH RESPECT
TO THIS  AGREEMENT OR ANY OTHER  INSTRUMENT,  DOCUMENT OR AGREEMENT  EXECUTED OR
DELIVERED IN CONNECTION HEREWITH, OR THE TRANSACTIONS RELATED HERETO OR THERETO,
WHETHER NOW EXISTING OR HEREAFTER  ARISING,  AND WHETHER SOUNDING IN CONTRACT OR
TORT OR  OTHERWISE;  AND EACH PARTY  HEREBY  AGREES AND  CONSENTS  THAT ANY SUCH
CLAIM, DEMAND, ACTION OR CAUSE OF ACTION SHALL BE DECIDED BY COURT TRIAL WITHOUT
A JURY, AND THAT ANY PARTY TO THIS AGREEMENT MAY FILE AN ORIGINAL COUNTERPART OR
A COPY OF THIS SECTION WITH ANY COURT AS WRITTEN  EVIDENCE OF THE CONSENT OF THE
PARTIES HERETO TO THE WAIVER OF THEIR RIGHT TO TRIAL BY JURY.

                  IN WITNESS  WHEREOF,  this Agreement has been duly executed as
of the day and year specified at the beginning hereof.

                                         BORROWER:
                                         ---------

                                         NORTHERN GEOPHYSICAL OF
                                         AMERICA,
                                           INC.


                                         By    /s/ Ronald L. Koons
                                            ---------------------------------

                                         Title  Vice President


                                         LENDER:

                                         SANWA BUSINESS CREDIT
                                         CORPORATION


                                         By    /s/ Timothy K. Turner
                                            ---------------------------------

                                         Title  First Vice President


                                       45




                                    EXHIBIT A

                                   FINANCIALS
                                 (SEE ATTACHED)


                                       A-1




                                    EXHIBIT B

                     FORM OF NOTICE OF BORROWING/CONVERSION
                                 (SEE ATTACHED)



                                       B-1




                                    EXHIBIT C

                                    LOCATIONS

8226 Park Meadows Drive
     Littleton, CO 80124

1)   2361 Cinnabar Loop
     Anchorage, AK  99507

2)   11177 Katy Freeway
     Houston, Texas  77079

3)   2495 W. Mesa Court
     Grand Junction, CO  81505

4)   5723 Roberts Street
     Katy, Texas  77450

5)   5707 State Route 61, Box 32
     Mt. Gilead, OH  43338

6)   599 Lexington Avenue
     Suite 4102
     New York, NY  10022

7)   Ninos Heros No. 51
     Esquina Guadalupel Ramirez
     Col. Tepenan, Del. Xochimilco
     Mexico, D.F.  16020

8)   4750 30th Street SE
     Calgary, Alberta, Canada  T2B 2Z1





The states in which Borrower usually works include:

     1)    California
     2)    Nevada
     3)    Utah
     4)    Colorado
     5)    Wyoming
     6)    Montana
     7)    North Dakota


                                       C-1





     8)    Kansas
     9)    Oklahoma
     10)   Texas
     11)   Mississippi
     12)   Alaska


The states in which Borrower has worked sporadically in the past and potentially
in the future include:

     1)    Oregon
     2)    Illinois
     3)    Louisiana
     4)    New Mexico


                                       C-2




                                    EXHIBIT D

                                   TRADENAMES

1)   3-D Geophysical, Inc.

2)   3-D Geophysical of Latin America, Inc.

3)   3-D Geophysical of Canada, Inc.

4)   Geo Acquisition Sub, Inc.

5)   Geoevaluaciones, S.A. de C.V.

6)   Procesos Interactivos Avanzados, S.A. de C.V.

7)   International Production Services, Inc.

8)   JanVo Equities, Ltd.

9)   Cal-Core Properties, Ltd.

10)  Mueller Consulting Service, Ltd.

11)  Siegfried & Siegfried, Ltd.

12)  JRS Exploration Company, Ltd.

13)  Paragon Geophysical, Inc.

14)  Kemp Geophysical Corporation

15)  Northern Geophysical of America, A Joint Venture

16)  Northern Geophysical of America (Alaska), Inc.



                                       D-1




                                    EXHIBIT E

                                   LITIGATION



1.       Leo  Popp  and  Zbranek  Brothers  v.  Victor  Jerome  Sodia  and  Kemp
         Geophysical  Corporation,  filed in the 23rd Judicial District Court of
         Wharton County, Texas

2.       Kelman Technologies,  Inc. (formerly Capilano  International,  Inc.) v.
         Geoevaluaciones,  S.A.  de C.V.,  filed in  Federal  District  Court in
         Mexico

3.       Karen L. Rudolph v. Northern  Geophysical  of America,  Inc.,  filed in
         United States District Court, Southwestern Division, North Dakota

4.       Crystal Calkins,  f/n/a Crystal Hutzenbiler v. Northern  Geophysical of
         America,  Inc.,  filed in United States  District  Court,  Southwestern
         Division, North Dakota

5.       Domingo  Martinez  Uscanga v.  Geoevaluaciones,  S.A. de C.V., filed in
         Junta Federal 38 de Conciliacion y Arbitraje de Coatzacoalcos, Veracruz

6.       Naftali Mendez Gomez v. PEMEX, Perforadata and Geoevaluaciones, S.A. de
         C.V.,  filed in Junta  Especial  7-Bis de la Federal de  Concilacion  y
         Arbitraje (Labor Federal Court 7-Bis)

7.       Geoevaluaciones,  S.A. de C.V. v.  S.H.C.P.  (Mexican  Tax  Authority),
         filed in Income Tax Office in Nuevo Laredo, Tamaulipas,  Mexico, Docket
         No. 738/97

8.       Geoevaluaciones,  S.A. de C.V. v.  S.H.C.P.  (Mexican  Tax  Authority),
         filed in Income Tax Office in Nuevo Laredo, Tamaulipas,  Mexico, Docket
         No. 739/97

9.       Geoevaluaciones,  S.A. de C.V. v.  S.H.C.P.  (Mexican  Tax  Authority),
         filed in Income Tax Office in Nuevo Laredo, Tamaulipas,  Mexico, Docket
         No. 32420

10.      Elsie  Zahn and  Edwin &  Lillian  Eggemeyer  v.  Kemp  Geophysical,  a
         threatened  action  in Texas  resulting  from an  alleged  trespass  in
         January, 1996

11.      Coby Shorter,  Jr. v. Kemp  Geophysical,  a threatened  action in Texas
         resulting from an alleged trespass in January, 1996


                                       E-1




                                    EXHIBIT F

                             TITLE TO ASSETS, LIENS



                                       F-1





                                    EXHIBIT G

                           AFFILIATES AND SUBSIDIARIES

AFFILIATES

1)   3-D Geophysical, Inc., a Delaware corporation

2)   3-D Geophysical of Latin America, Inc., a Cayman Islands company

3)   3-D Geophysical of Canada, Inc., an Alberta Canada company

4)   Geo Acquisition Sub, Inc., a Delaware corporation

5)   Geoevaluaciones, S.A. de C.V., a Mexican company

6)   Procesos Interactivos Avanzados, S.A. de C.V., a Mexican company

7)   International Production Services, Inc., a Texas company

8)   JanVo Equities, Ltd., an Alberta, Canada company

9)   Cal-Core Properties, Ltd., an Alberta, Canada company

10)  Mueller Consulting Service, Ltd., an Alberta, Canada company

11)  Siegfried & Siegfried, Ltd., an Alberta, Canada company

12)  JRS Exploration Company, Ltd., an Alberta, Canada company

13)  Paragon Geophysical, Inc., an Ohio company

14)  Kemp Geophysical Corporation, a Texas company

15)  Northern Geophysical of America, A Joint Venture, a Colorado partnership

16)  Northern Geophysical of America (Alaska), Inc., an Alaska corporation


SUBSIDIARIES

None


                                       G-1





                                    EXHIBIT H

                     FORM OF COVENANT COMPLIANCE CERTIFICATE
                                 (SEE ATTACHED)



                                       H-1
              







                                    EXHIBIT I

                         FORM OF DAILY COLLATERAL REPORT

                                 (SEE ATTACHED)



                                       I-1





                                    EXHIBIT J

                    EXISTING INDEBTEDNESS FOR BORROWED MONEY





                                       J-1





                                  SCHEDULE 1.30

                                    EQUIPMENT


                                       68




                                SCHEDULE 10.1(A)

FINANCIAL COVENANTS

NOTE:  All of the following covenants and definitions are on a
consolidated basis for 3-D Geophysical, Inc. and its consolidated subsidiaries





=============================================================================================================================
               COVENANT                                       REQUIRED                                  COMMENTS
=============================================================================================================================
                                                                                    
Indebtedness to Tangible Net                               1997  - 1.3                       Tested quarterly.
Worth Ratio                                                1998  - 1.3                       For purposes of this
                                                           1999  - 1.3                       covenant,
                                                           2000  - 1.3                       "Indebtedness" shall
                                                           2001  - 1.3                       be exclusive of
                                                           2002  - 1.3                       operating leases,
                                                                                             contingent
                                                                                             liabilities
                                                                                             arising
                                                                                             out
                                                                                             of
                                                                                             lawsuits
                                                                                             not
                                                                                             yet
                                                                                             ripened
                                                                                             into
                                                                                             judgments,
                                                                                             performance
                                                                                             and
                                                                                             importation
                                                                                             bonds
                                                                                             and
                                                                                             deferred
                                                                                             taxes.
- -----------------------------------------------------------------------------------------------------------------------------
Tangible Net Worth                        Closing Date             $38,000,000               Tested quarterly
("TNW")
                                          At 12/31/97              $38,000,000

                                          Thereafter Previous year-end TNW plus the following amount
                                          1998
                                          1st quarter                 $450,000
                                          2nd quarter                 $450,000
                                          3rd quarter                 $750,000
                                          4th quarter                 $950,000

                                          1999
                                          1st quarter                 $300,000
                                          2nd quarter                 $300,000
                                          3rd quarter                 $700,000
                                          4th quarter                 $800,000

=============================================================================================================================



                                       68







=============================================================================================================================
                                                                                    
                                          2000
                                          1st quarter                 $450,000
                                          2nd quarter                 $450,000
                                          3rd quarter                 $750,000
                                          4th quarter                 $950,000

                                          2001
                                          1st quarter                 $500,000
                                          2nd quarter                 $500,000
                                          3rd quarter               $1,000,000
                                          4th quarter               $1,200,000

                                          2002
                                          1st quarter                 $650,000
                                          2nd quarter                 $650,000
                                          3rd quarter               $1,200,000
                                          4th quarter               $1,450,000

- -----------------------------------------------------------------------------------------------------------------------------
Cash Flow Coverage Ratio                                   1997  - 1.05                      1997 will be a 4th
                                                           1998  - 1.05                      quarter test only.
                                                           1999  - 1.05
                                                           2000  - 1.10                      1998 will be tested
                                                           2001  - 1.15                      each quarter based
                                                           2002  - 1.20                      on the following
                                                                                             trailing levels:

                                                                                             1st quarter - trailing
                                                                                             6 months

                                                                                             2nd quarter - trailing
                                                                                             9 months

                                                                                             3rd quarter - trailing
                                                                                             12 months

                                                                                             4th quarter - trailing
                                                                                             12 months

                                                                                             1999 and thereafter
                                                                                             will be tested each
                                                                                             quarter on a trailing
                                                                                             12 month basis



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- -----------------------------------------------------------------------------------------------------------------------------
                                                                                                      
Net Income (determined in                 1997                                               1997 will be a 4th
accordance with generally                 4th quarter            $200,000 for the            quarter test only.
accepted accounting                                              quarter
principles, consistently                                                                     1998 will be tested
applied)                                  1998                                               each quarter based
                                          ----
                                          1st quarter             $  900,000                 on the following
                                          2nd quarter             $  900,000                 trailing levels:
                                          3rd quarter             $1,500,000
                                          4th quarter             $1,900,000                 1st quarter - trailing
                                                                                             6 months
                                          1999
                                          1st quarter             $1,900,000                 2nd quarter - trailing
                                          2nd quarter             $1,800,000                 9 months
                                          3rd quarter             $1,700,000
                                          4th quarter             $1,600,000                 3rd quarter - trailing
                                                                                             12 months
                                          2000
                                          1st quarter             $1,700,000                 4th quarter - trailing
                                          2nd quarter             $1,700,000                 12 months
                                          3rd quarter             $1,800,000
                                          4th quarter             $1,900,000                 1999 and thereafter
                                                                                             will be tested each
                                          2001                                               quarter on a trailing
                                          1st quarter             $2,000,000                 12 month basis
                                          2nd quarter             $2,100,000
                                          3rd quarter             $2,300,000
                                          4th quarter             $2,400,000

                                          2002
                                          1st quarter             $2,500,000
                                          2nd quarter             $2,600,000
                                          3rd quarter             $2,800,000
                                          4th quarter             $2,900,000
=============================================================================================================================



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                                  SCHEDULE 10.2

                                DEPOSIT ACCOUNTS




Bank or Institution                            Acct.             Account No.            Address
                                               Name

                                                                                                
1)   Wells Fargo Bank                          3-D               4159499706             Energy Department
                                               3-D               4159677962             1000 Louisiana
                                               NGA               4159677921             3rd Floor
                                               NGA               4159677939             Houston, Texas 77002
                                               NGA               4159677913
                                               3-D               4159677947
1)   Bank One, Colorado, N.A.                  NGA               1283238127             P.O. Box 5586
                                               NGA               1283236881             Denver, CO 80217-5586
                                               3-D               1283238135             1125 17th Street
                                               3-D               616285722              Denver, CO 80202-2088
                                               NGA               616285714              Attention: Ann Lyons
                                               3-D               616285730
1)   Bank One, N.A.                            Paragon           789068228              Department 1045
                                               Paragon           789065628              Columbus, OH 43271-1045
                                               Paragon           789068201
1)   Norwest Bank                              3-D               2693022920             2350 East Arapahoe Road
                                               3-D               2698019346             Littleton, CO 80122
1)   Chase Manhattan Bank                      3-D               031173041              1211 Avenue of the Americas
                                                                                        36th Floor
                                                                                        New York, NY 10036
1)   Laredo National Bank                      GEO               80106218               Houston, Texas
1)   Barclays Bank PLC                                           2774282                P.O. Box 68
                                                                                        Georgetown, Grand Cayman,
                                                                                        BWI
1)   Banco Wiese                                                 1484280                051 Camino Real
                                                                 3475131                Lima, Peru

1)   Banco Santa Cruz de la Sierra                               1000104200302241       Santa Cruz, Bolivia

1)   Royal Bank of Canada                                        1080018                Calgary, Alberta, Canada



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1)   Alberta Treasury Branches                                   730000005124           Calgary, Alberta, Canada
                                                                 730000005170
                                                                 730000005102
                                                                 730000007824
                                                                 730000008624
                                                                 730000009424
                                                                 730000010824
                                                                 730000011624
                                                                 730000012424
                                                                 730000013224
                                                                 730000016724
                                                                 730000163324
                                                                 730000164124
                                                                 730000018324
                                                                 730000019124
                                                                 730000020524
1)   Banca Serfin, S.A.                                          40003113425            Renosa, Tamualipas, Mexico
1)   Banca Serfin, S.A.                                          0530120808781          Posa Rica, Veracruz, Mexico
1)   Banca Serfin, S.A.                                          10604018686            Soledad de Doblado,
                                                                                        Veracruz, Mexico
1)   Banca Serfin, S.A.                                          03707382927            General Bravo, N.L., Mexico
1)   Banca Serfin, S.A.                                          09006053748            Mexico City, Mexico
                                                                 09009412285
1)   Banco Inverlar, S.A.                                        9275185                Mexico City, Mexico
1)   Banamex, S.A.                                               3630757                Mexico City, Mexico
                                                                 9275185
1)   Banamex, S.A.                                               2036102                Posa Rica, Veracruz, Mexico
1)   Banamex, S.A.                                               3020414                Reynosa, Tamulipas, Mexico
1)   Bancomer, S.A.                                              181788                 Laredo, Tamulipas, Mexico
1)   Inversiones Serfin                                          09009412285            Mexico City, Mexico
1)   Inversiones Banamex                                         71676560               Mexico City, Mexico

1)   Banco Continental/Tarapoto                               00110310080100014926   Tarapota, Peru

Abbreviations Summary:
"3-D" = 3-D Geophysical, Inc.
"NGA" = Northern Geophysical of America, Inc.
"Paragon" = Paragon Geophysical, Inc.
"GEO" = Geoevaluaciones, S.A. de C.V.



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