PLEDGE AGREEMENT

         This Pledge  Agreement is entered into as of November 17, 1997,  by and
between:

PLEDGOR:    3-D GEOPHYSICAL, INC.
            8226 Park Meadows Drive
            Littleton, Colorado  80124

                                 AND

PLEDGEE:    SANWA BUSINESS CREDIT CORPORATION
            550 North Brand Boulevard
            Glendale, California 91203

         WHEREAS, 3-D Geophysical, Inc., a Delaware corporation ("Pledgor") owns
one hundred percent (100%) of the issued and outstanding shares of capital stock
of Northern Geophysical of America, Inc., a Delaware corporation ("Borrower");

         WHEREAS,  Borrower  has  received  or  will  receive  loans  and  other
financial  accommodations made by Sanwa Business Credit Corporation  ("Pledgee")
pursuant to a Loan and Security  Agreement  dated as of the date hereof  between
Borrower and Pledgee (the "Loan Agreement");

         WHEREAS,  in consideration for such financial  accommodations,  Pledgor
has  guarantied  the  obligations  of Borrower to Pledgee  pursuant to a Secured
Continuing  Corporate  Guaranty  dated as of the date hereof  (the  "Guaranty"),
which Guaranty is secured by, among other things, this Pledge Agreement.

         NOW  THEREFORE,  for  value  received,  and  in  consideration  of  the
foregoing recitals, Pledgor and Pledgee hereby agree as follows:

         1. Pledge of Collateral and Delivery of Pledged Collateral.

              1.1  Pledgor  hereby  pledges and assigns to Pledgee and grants to
Pledgee a security  interest  in all of the  Collateral  described  in Section 2
below, whether now owned or hereafter acquired,  now or at any time hereafter in
the  possession,  custody or control of Pledgee or its agents,  whether held for
safekeeping, in a safe deposit box, or otherwise ("Collateral") to secure prompt
payment and full  performance  of the  obligations  described in Section 3 below
(collectively, "Obligations").

              1.2 All certificates or instruments representing or evidencing the
Collateral  shall be delivered  to and held by or on behalf of Pledgee  pursuant
hereto and shall be in  suitable  form for  transfer  by  delivery,  or shall be
accompanied by duly executed instruments of transfer or assignment in blank, all
in form and substance satisfactory to Pledgee.  Pledgee shall have the right, at
any time,  after an Event of Default  (as  defined  herein),  in its  reasonable
discretion and without notice to Pledgor, to transfer to or to register




in the name of Pledgee or any of its nominees any or all of the  Collateral.  In
addition,  Pledgee shall have the right at any time to exchange  certificates or
instruments   representing   or  evidencing   Collateral  for   certificates  or
instruments of smaller or larger denominations.

         2. Collateral. The Collateral consists of the following:

              2.1 All the shares of common stock of Borrower, owned beneficially
and of record by  Pledgor  and listed on  Schedule I attached  hereto and made a
part hereof, and all cash, dividends, other securities,  instruments, rights and
other  property  at any time and from time to time  received  or  receivable  in
respect  thereof or in exchange for all or any part thereof,  including  without
limitation, stock dividends,  warrants, rights to subscribe,  conversion rights,
liquidating  dividends and other stock rights, and in the event Pledgor receives
any of the foregoing,  Pledgor  acknowledges  that the same shall be received IN
TRUST for  Pledgee  and agrees  immediately  to  deliver  the same to Pledgee in
original form of receipt,  together with any stock or bond powers,  assignments,
endorsements or other documents or instruments as Pledgee may reasonably request
to  establish,  protect  or  perfect  Pledgee's  interest  in  respect  of  such
Collateral; and

              2.2  Subject  to the  terms of  Section  7.1.2  hereof,  all other
property  hereafter  delivered  to  Pledgee  (or any agent or bailee  holding on
behalf of Pledgee) by Pledgor in  substitution  for or in addition to any of the
foregoing,  all  certificates  and  instruments  representing or evidencing such
other property and all cash, dividends,  other securities,  instruments,  rights
and other  property at any time and from time to time  received or receivable in
respect  thereof or in exchange for all or any part thereof,  including  without
limitation, stock dividends,  warrants, rights to subscribe,  conversion rights,
liquidating  dividends and other stock rights, and in the event Pledgor receives
any of the foregoing,  Pledgor  acknowledges  that the same shall be received IN
TRUST for  Pledgee  and agrees  immediately  to  deliver  the same to Pledgee in
original form of receipt,  together with any stock or bond powers,  assignments,
endorsements  or other  documents  or  instruments  as  Pledgee  may  request to
establish,  protect or perfect Pledgee's interest in respect of such Collateral;
and

              2.3 All proceeds of all of the foregoing.

         3. Obligations. The Obligations secured under this Pledge Agreement are
the  obligations of Pledgor under the Guaranty and under this Pledge  Agreement,
and  all  extensions,  amendments,  modifications  and  renewals  of  any of the
foregoing.

         4.  Representations and Warranties.  Pledgor represents and warrants on
the date  hereof,  and shall be deemed to  represent  and warrant on the date of
each loan or advance made by Pledgee to Borrower, that:

              4.1 Pledgor is the sole  legal,  beneficial  and,  if  applicable,
record owner of the Collateral  (or, in the case of  after-acquired  Collateral,
will be the sole such owner thereof),  having good and marketable title thereto,
free of all liens, security interests, encumbrances or claims of any kind;


                                       -2-



              4.2 All  information  heretofore,  herein  or  hereafter  given to
Pledgee by or on behalf of Pledgor is complete, true and correct.

              4.3 All shares of stock constituting Collateral (a) have been duly
and validly  issued in  compliance  with all  applicable  state and federal laws
(including,  without  limitation,  the  Securities  Act of 1933, as amended (the
"Securities Act"), if applicable), (b) are fully paid, nonassessable and free of
preemptive  rights,  (c) are not  subject  to any  restrictions  upon the voting
rights or upon the transfer  thereof other than as may appear on the face of the
certificates  evidencing  such  Collateral,  (d)  constitute  all  securities of
Borrower owned beneficially and of record by Pledgor and (e) include 100% of the
issued and outstanding shares of each class of voting stock of Borrower;

              4.4  Pledgor  has the right and power and is duly  authorized  and
empowered to enter into, execute, deliver and perform this Pledge Agreement;

              4.5 This Pledge  Agreement has been duly executed and delivered by
Pledgor  and  constitutes  a legal,  valid and  binding  obligation  of Pledgor,
enforceable against Pledgor in accordance with its terms;

              4.6  The  execution,  delivery  and  performance  of  this  Pledge
Agreement do not (i) violate any  provisions of law or any order of any court or
other agency of  government,  or (ii)  contravene  any provision of any material
contract  or  agreement  to which  Pledgor  is a party or by  which  Pledgor  or
Pledgor's assets are bound; and

              4.7  Each of the  representations  and  warranties  set  forth  in
Paragraph 16 of the Guaranty is accurate and complete as of the date hereof.

         5.  Covenants  of  Pledgor.  Until  the  Obligations  are paid in full,
Pledgor agrees to:

              5.1 Preserve and protect the Collateral;

              5.2 Not  create,  incur,  assume or  permit  to exist  any  liens,
encumbrances, security interests, levies, assessments or charges on or in any of
the Collateral, except those approved in advance in writing by Pledgee;

              5.3 Promptly pay and discharge  before the same become  delinquent
all taxes,  assessments and governmental charges or levies imposed on Pledgor or
any of the Collateral;

              5.4 Not sell,  encumber,  or otherwise  dispose of or transfer any
Collateral,  or any right or interest  therein and agrees that it will (i) cause
Borrower not to issue any other  voting stock in addition to or in  substitution
for the Collateral,  except to Pledgor,  or in connection with outstanding stock
options or with the prior written consent of Pledgee and (ii) pledge  hereunder,
immediately upon Pledgor's acquisition (directly or indirectly) thereof, any and
all additional shares of stock or other securities of Borrower;


                                       -3-



              5.5 Appear in and defend, at Pledgor's own expense,  any action or
proceeding  which may affect  Pledgor's  title to or  Pledgee's  interest in the
Collateral;

              5.6 Procure or execute and deliver, from time to time, in form and
substance satisfactory to Pledgee, any stock powers, bond powers,  endorsements,
assignments,  financing  statements,  estoppel  certificates  or other  writings
deemed  necessary  or  appropriate  by Pledgee to  perfect,  maintain or protect
Pledgee's security interest in the Collateral and the priority thereof, and take
such other action and deliver such other  documents,  instruments and agreements
pertaining to the  Collateral as Pledgee may request to effectuate the intent of
this Pledge Agreement;

              5.7 If Pledgee gives value to enable  Pledgor to acquire rights in
or use of any Collateral, use such value only for such purpose;

              5.8 Keep separate, accurate and complete records of the Collateral
and provide Pledgee with access thereto and to Pledgor's  financial records,  in
each case with the right to make extracts therefrom;

              5.9 Provide  Pledgee with copies of all reports  filed by Borrower
or Pledgor with the Securities and Exchange  Commission within ten (10) business
days after the last date such report is required to be filed;

              5.10 Provide Pledgee with such other information pertaining to the
Collateral as Pledgee may reasonably request from time to time;

              5.11 Maintain and preserve its corporate or other legal  existence
and that of its  majority-owned  subsidiaries,  including,  without  limitation,
Borrower, and all rights,  privileges,  franchises and other authority necessary
for the conduct of their respective businesses; and

              5.12  Continue its  operations  in the same form and  structure of
business (i.e., corporate, partnership,  individual) as currently conducted, and
not  merge  or  consolidate  with  or  acquire  or  be  acquired  by  any  other
corporation,  partnership,  entity or person,  without  Pledgee's  prior written
consent; and

              5.13 At all times comply with the  covenants  and  agreements  set
forth in the Guaranty.

         6. Authorized Action by Pledgee.

              6.1   Pledgor   hereby   irrevocably   appoints   Pledgee  as  its
attorney-in-  fact to do (but  Pledgee  shall not be  obligated to and shall not
incur any  liability to Pledgor or any third party for failure so to do) any act
which Pledgor is obligated by this Pledge  Agreement to do, and to exercise such
rights and powers as Pledgor  might  exercise  with  respect to the  Collateral,
including, without limitation, the right to:

                  6.1.1 collect by legal proceedings or otherwise and endorse,


                                       -4-



receive and receipt for all  payments,  proceeds and other sums and property now
or  hereafter  payable on or in respect of proceeds  and other sums and property
now or hereafter payable on or in respect of the Collateral, including dividends
and interest payments;

                  6.1.2  enter  into  any  extension,  reorganization,  deposit,
merger  or  consolidation   agreement  or  other  agreement  pertaining  to  the
Collateral,  and in connection therewith may deposit or surrender control of the
Collateral  thereunder,  accept other property in exchange therefor,  and do and
perform  such acts and things as it may deem  proper,  and any money or property
secured in  exchange  therefor  shall be applied to the  Obligations  or held by
Pledgee pursuant to the provisions of this Pledge Agreement;

                  6.1.3 protect and preserve the Collateral;

                  6.1.4  transfer  the  Collateral  to its own or its  nominee's
name; and

                  6.1.5 make any compromise,  settlement or adjustment, and take
any action it deems advisable, with respect to the Collateral;

provided,  however,  that  Pledgee  shall only  exercise  such rights  after the
occurrence  and  during the  continuation  of an Event of  Default  (as  defined
herein),  except that upon the cure of any Event of Default,  Pledgee shall have
the right to complete any action commenced by it during such Event of Default.

              6.2 Pledgor agrees to reimburse  Pledgee upon demand for any costs
and  expenses,  including  attorneys'  fees,  Pledgee may incur while  acting as
Pledgor's  attorney-in-fact  hereunder,  all of which  costs  and  expenses  are
included in the  Obligations  secured hereby and are payable upon demand.  It is
further  agreed and  understood  between  the  parties  hereto that such care as
Pledgee  gives  to the  safekeeping  of its  own  property  of like  kind  shall
constitute  reasonable  care of the  Collateral  when in  Pledgee's  possession;
provided,  however,  that Pledgee shall not be required to make any presentment,
demand or  protest,  or give any notice and need not take any action to preserve
any rights  against any prior party or any other person in  connection  with the
Obligations or with respect to the Collateral.

              6.3 If  Pledgor's  records are  prepared or retained by a computer
service  company  or any  accountant  or  accounting  service,  so  long  as any
Obligations are outstanding, Pledgor grants Pledgee the absolute and irrevocable
right to inspect  such  records,  receive  duplicate  copies of all  information
furnished  to Pledgor and prepared by such  company,  accountant  or  accounting
service,  and agrees to furnish such  consents as may be necessary to effectuate
the same.  Pledgor  further  agrees to promptly  notify  Pledgee of the name and
address of such company,  accountant or accounting  service and of any change in
respect thereof.

              6.4 All the foregoing powers authorized herein, being coupled with
an interest, are irrevocable so long as any Obligations are outstanding.

                                                      -5-









         7. Transfer, Voting, Dividends, Etc.

              7.1  Notwithstanding  any other  provision  hereof,  so long as no
Event of Default (as defined herein) shall have occurred and be continuing:

                  7.1.1  Pledgor shall be entitled to exercise all voting powers
pertaining to all shares of stock and other securities  constituting  Collateral
for all purposes not inconsistent with the terms of this Pledge Agreement;

                  7.1.2 To the extent  permitted in the Loan Agreement,  Pledgor
shall be  entitled  to receive  and retain all  dividends  (other  than stock or
liquidating  dividends)  and all  interest  payments  payable  in respect of the
Collateral;  provided, however, that all stock or property representing stock or
liquidating  dividends or a distribution or return of capital upon or in respect
of the shares of stock  constituting  Collateral  or resulting  from a split-up,
revision  or  reclassification  of  such  Collateral  or  received  in  exchange
therefor, as a result of a merger,  consolidation or otherwise, shall be paid or
transferred directly to Pledgee immediately upon receipt thereof by Pledgor, and
shall be retained by Pledgee as Collateral hereunder; and

                  7.1.3 in order to  permit  Pledgor  to  exercise  such  voting
powers and to receive such  dividends  Pledgee  shall,  if  necessary,  upon the
written  request  of the  Pledgor,  from time to time,  execute  and  deliver to
Pledgor appropriate proxies.

              7.2 If any  Event  of  Default  (as  defined  herein)  shall  have
occurred and while the same is continuing:

                  7.2.1  Pledgee,  or its  nominee or  nominees,  shall,  at its
option  (after  notice to Pledgor of Pledgee's  intent to exercise such rights),
have the sole and exclusive  right to exercise all voting  powers  pertaining to
the shares of stock constituting  Collateral,  and shall exercise such powers in
such  manner as  Pledgee  may  elect,  and  Pledgor  hereby  grants  Pledgee  an
irrevocable  proxy,  coupled  with an  interest  to vote  such  shares of stock;
provided, however, that such proxy shall terminate upon termination of Pledgee's
security interest therein; and

                  7.2.2 All  dividends and other  distributions  made upon or in
respect of shares of stock  constituting  Collateral  and all interest  payments
shall be paid  directly  to and  shall be  retained  by  Pledgee  as  Collateral
hereunder.

         8. Default and Remedies.

              8.1 The  occurrence of any of the  following  events or conditions
(herein "Events of Default")  shall, at the option of Pledgee and without notice
to or demand on Pledgor, constitute an Event of Default hereunder:

                  8.1.1 any Default, under and as defined in the Loan Agreement,
shall have occurred and be continuing;


                                       -6-



                  8.1.2 breach,  violation or  non-performance  of any warranty,
covenant or undertaking on Pledgor's part hereunder; or

                  8.1.3 breach,  violation or  non-performance  of any warranty,
covenant or undertaking on Pledgor's part under any other agreement with Pledgee
(including, without limitation, the Guaranty).

              8.2 Upon the  occurrence of any Event of Default,  Pledgee may, at
its  option,  without  notice to or demand on Pledgor,  declare all  Obligations
immediately  due and payable,  and Pledgee shall have all the default rights and
remedies  of a secured  party under  Chapter 5 of  Division 9 of the  California
Uniform Commercial Code and other applicable law as well as the following rights
and remedies,  all of which may be exercised  with or without  further notice to
Pledgor, at Pledgee's sole option and as Pledgee in its sole discretion may deem
advisable:

                  8.2.1 to settle, compromise or release, on terms acceptable to
Pledgee, in whole or in part, any amounts owing on the Collateral, and to extend
the time of payment,  in  Pledgee's  name or in the name of Pledgor,  in respect
thereof;

                  8.2.2 to apply to the payment of the  Obligations,  or set-off
or collect the Collateral, notwithstanding any forfeiture of interest or loss of
other rights of Pledgor  against any obligor on the  Collateral  resulting  from
such action; and

                  8.2.3 to sell or otherwise  dispose of the Collateral,  or any
part  thereof,  either at public  or  private  sale,  on any  broker's  board or
securities exchange, in lots or in bulk, for cash, on credit or otherwise,  with
or  without  representations  or  warranties,  and upon  such  terms as shall be
acceptable to Pledgee.

              8.3  The  net  cash  proceeds   resulting  from  the   collection,
liquidation,  sale,  or other  disposition  of the  Collateral  shall be applied
first,  to the expenses  (including  all attorneys'  fees) of holding,  storing,
preparing for sale, selling, collecting, liquidating and the like, including any
brokerage  commissions and stamp or transfer taxes, and then to the satisfaction
of all Obligations secured hereby,  application as to any particular  obligation
or  indebtedness  or against  principal or interest to be in Pledgee's  absolute
discretion.

              8.4 If by reason of any  prohibition  contained in the  Securities
Act of 1933, as now or hereafter in effect, or in applicable California or other
state  securities  laws,  as now or  hereafter  in  effect,  or in any  rules or
regulations  pertaining to any of the  foregoing  laws,  Pledgee  believes it is
compelled to resort to one or more private sales of shares of stock constituting
Collateral to a single purchaser or a restricted group of purchasers who will be
obliged to agree,  among other things,  to acquire such securities for their own
account,  for  investment  and not  with a view to the  distribution  or  resale
thereof,  Pledgor  acknowledges and agrees that private sales of such Collateral
may be held  notwithstanding that such sales may be at prices and on other terms
less  favorable  to Pledgor  than if such  Collateral  were sold at public sale.
Pledgor  further  agrees that Pledgee has no obligation to delay the sale of any
such Collateral for the period of time necessary to permit registration of


                                       -7-



the Collateral,  even if the issuer thereof would, or should,  agree to register
such  Collateral  for public  sale under  applicable  securities  laws.  Pledgor
specifically  agrees that private sales made under the  foregoing  circumstances
shall be deemed to have been made in a "commercially reasonable" manner.

              8.5 Pledgor further  acknowledges  and recognizes that Pledgee may
be unable to effect a public sale of all or a part of the  Collateral and may be
compelled to resort to one or more private sales of shares of stock constituting
Collateral to a single purchaser or a restricted group of purchasers who will be
obligated to agree,  among other things, to acquire the Collateral for their own
account,  for  investment  and not  with a view to the  distribution  or  resale
thereof.  Pledgor  acknowledges that any such private sales may be at prices and
on terms less  favorable to Pledgee than those of public sales,  and agrees that
such  private  sales  shall  be  deemed  to have  been  made  in a  commercially
reasonable  manner and that Pledgee has no  obligation  to delay the sale of any
Collateral to permit the issuer thereof to register it for public sale under the
Securities Act.

         9. Duty of Pledgee.  Pledgee  shall not be under any duty or obligation
whatsoever to collect any dividends,  interest or other payments due or accruing
in  respect  of the  Collateral  or to take any  action  to  preserve  rights in
connection with any Collateral,  including, without limitation, making or giving
any presentment, demands for performance, notices of non-performance,  protests,
notices of protest or notices of dishonor in connection with any Collateral.

         10. Cumulative Rights. The rights, powers and remedies of Pledgee under
this Pledge  Agreement  shall be in addition to all rights,  powers and remedies
given to Pledgee under any statute or rule of law, this Pledge  Agreement or any
other  agreement,  all of which rights,  powers and remedies shall be cumulative
and may be exercised successively or concurrently.

         11. Waiver. Any forbearance,  failure or delay by Pledgee in exercising
any right, power or remedy shall not preclude the further exercise thereof,  and
every right,  power or remedy of Pledgee shall continue in full force and effect
until such right,  power or remedy is specifically  waived in a writing executed
by Pledgee.  Pledgor waives any right to require  Pledgee to proceed against any
person or to exhaust any  Collateral or to pursue any remedy in Pledgee's  power
prior to pursuing Pledgor in respect of the Obligations.

         12.  Setoff.  Pledgor  agrees that  Pledgee may  exercise its rights of
setoff with respect to the  Obligations in the same manner as if the Obligations
were unsecured.

         13.  Binding Upon  Successors.  All rights of Pledgee under this Pledge
Agreement  shall inure to the benefit of its  successors  and  assigns,  and all
obligations  of  Pledgor  shall bind the  representatives,  and  successors  and
assigns of the Pledgor.

         14. Waiver of Suretyship Defenses. Pledgor hereby reaffirms each of the
waivers given in the Guaranty as if each such waiver was fully set forth herein.


                                       -8-





         15.  Substituted   Collateral;   Additional  Collateral.   Pledgor  may
substitute  Collateral under this Pledge Agreement  provided that any Collateral
proposed  for   substitution  is  satisfactory  to  Pledgee  in  Pledgee's  sole
discretion.  As  of  the  date  of  delivery  of  any  Collateral  approved  for
substitution  by Pledgee  pursuant to this Section 15 or  otherwise  approved as
additional  security pursuant to this Pledge Agreement,  Pledgor  represents and
warrants to Pledgee  that (1) Pledgor  will own such  shares,  certificates  and
instruments  free and clear of any right of any other person or entity,  and (2)
Pledgor  will have good and  marketable  title to the shares,  certificates  and
instruments  and  have  the  right  to  pledge  such  shares,   certificates  or
instruments  pursuant to this Pledge Agreement.  By delivery of such substituted
or additional  Collateral,  Pledgor shall have  represented  and warranted  that
Pledgee has a valid, perfected, first priority security interest in such shares,
certificates  and  instruments  and the  proceeds  thereof free and clear of all
liens, claims and rights of third parties whatsoever. All documentary,  stamp or
other  taxes or fees owing in  connection  with the  issuance,  transfer  and/or
pledge of the Collateral or any  substituted or additional  Collateral have been
paid and will hereafter be paid by Pledgor as such become due and payable.

         16. Entire Agreement;  Severability. This Pledge Agreement contains the
entire  pledge  agreement  between  Pledgee  and  Pledgor  with  respect  to the
Collateral.  If any of the  provisions  of this Pledge  Agreement  shall be held
invalid or  unenforceable,  this Pledge  Agreement  shall be construed as if not
containing those provisions and the rights and obligations of the parties hereto
shall be construed and enforced accordingly.

         17. Return; Acquittance. Pledgee may at any time deliver any Collateral
to Pledgor  and the  receipt  thereof by  Pledgor  shall be a complete  and full
acquittance  in  respect of the  Collateral  so  delivered,  and  Pledgee  shall
thereafter be discharged from any liability or responsibility therefor.

         18.  References.  As used  herein,  terms in the  singular  include the
plural.  The captions or titles of the sections of this Pledge Agreement are for
convenience  of  reference  only and  shall not  define or limit the  provisions
hereof.

         19.  Choice  of Law.  This  Pledge  Agreement  shall  be  construed  in
accordance with and governed by the laws of the State of California,  and, where
applicable and except as otherwise defined herein,  terms used herein shall have
the meanings  given them in the  California  Uniform  Commercial  Code.  Pledgor
irrevocably  and  unconditionally  submits to the  jurisdiction  of the Superior
Court of the State of  California  for the  County of Los  Angeles or the United
States District Court of the Central District of California, as Pledgee may deem
appropriate,  or if required, the Municipal Court of the State of California for
the County of Los Angeles,  in  connection  with any legal action or  proceeding
arising  out of or relating to this  Pledge  Agreement,  and Pledgor  waives any
objection  relating to the basis for personal or in rem jurisdiction or to venue
which it may now or hereafter have in any such suit, action or proceeding.

         20. Jury Trial. PLEDGOR AND PLEDGEE WAIVE THE RIGHT TO TRIAL BY JURY IN
ANY ACTION, SUIT, PROCEEDING OR COUNTERCLAIM OF


                                       -9-



ANY KIND ARISING OUT OF OR RELATED TO ANY OF THE OBLIGATIONS
HEREIN.

         21. Notice. Any written notice, consent or other communication provided
for in this Pledge  Agreement  shall be delivered or sent by  first-class  mail,
with  postage  prepaid,  to the party to be  notified,  to the  mailing  address
specified in the introductory  section hereof.  Such addresses may be changed by
written notice as provided herein.

         22.  Expenses.  Pledgor will  reimburse  Pledgee for all  out-of-pocket
expenses  incurred by Pledgee  arising out of the enforcement of this Agreement,
including without  limitation,  attorneys' fees and costs whether or not suit is
filed.


                                      -10-



         23. Indemnification.  Pledgor agrees to pay, and on demand to indemnify
and hold harmless, Pledgee, its successors, assigns and agents, from and against
any and all claims,  damages,  losses,  liabilities,  demands, suits, judgments,
causes  of  action  and  all  legal  proceedings,  whether  civil  or  criminal,
penalties,  fines and other  sanctions,  and any costs and expenses  incurred in
connection  therewith,  including attorneys' fees, which may result from, relate
to or arise  out of this  Pledge  Agreement  or any  Collateral,  including  the
ownership,  purchase,  delivery,  acceptance  or rejection,  use,  possession or
disposition of any item of Collateral,  but not including any claims arising out
of the gross negligence or willful misconduct of Pledgee or its agents.

         EXECUTED as of November 17, 1997.

PLEDGEE:                                              PLEDGOR:
SANWA BUSINESS CREDIT                                 3-D GEOPHYSICAL, INC.
CORPORATION
By: /s/ Timothy K. Turner                         By:  /s/ Ronald L. Koons
    ---------------------                              --------------------
Its:  First Vice President                             Its:  Vice President


                                      -11-



                                   SCHEDULE I

Class of Stock                                          No. of Shares
- --------------                                          -------------

1.  Common Stock of Northern Geophysical
    of America, Inc. registered in the name of

    3-D Geophysical, Inc.