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                                                                  Exhibit (c)(5)


      SUPPORT AGREEMENT (this "Agreement"), dated as of March 8, 1998, by and
between Western Atlas Inc., a Delaware corporation ("Parent"), and
________________________ ("Seller").

      WHEREAS, concurrently herewith, Parent, WAI Acquisition Corp. (the
"Purchaser"), a Delaware corporation and a subsidiary of Parent, and 3-D
Geophysical, Inc. (the "Company"), a Delaware corporation, are entering into an
Agreement and Plan of Merger of even date herewith (the "Merger Agreement",
which term shall not include any amendment to such Agreement which decreases the
Offer Price or changes the form of consideration payable in the Offer, unless
Seller consents to the inclusion of such amendment in such term). Capitalized
terms used but not defined herein shall have the meanings set forth in the
Merger Agreement, pursuant to which the Purchaser agrees to make a tender offer
(the "Offer") for all outstanding shares of common stock, par value $.01 per
share (the "Shares"), of the Company, at $9.65 per share (the "Offer Price") net
to the seller in cash, to be followed by a merger (the "Merger") of the
Purchaser with and into the Company;

      WHEREAS, as of the date hereof, Seller beneficially owns directly
______________ Shares (the "Owned Shares");

      WHEREAS, as a condition to their willingness to enter into the Merger
Agreement and make the Offer, Parent and the Purchaser have required that Seller
agree, and Seller hereby agrees, (i) to tender pursuant to the Offer the Owned
Shares, together with any Shares acquired after the date hereof and prior to the
termination of the Offer, whether upon the exercise of options, conversion of
convertible securities or otherwise (collectively, the "Tender Shares") on the
terms and subject to the conditions provided for in this Agreement and (ii) to
enter into the other agreements set forth herein; and

      NOW, THEREFORE, in consideration of the premises and for other good and
valuable consideration given to each party hereto, the receipt of which is
hereby acknowledged, the parties agree as follows:

      1. Agreement to Tender and Vote.

      1.1 Tender. Seller hereby agrees to validly tender (or cause the record
owner of such shares to validly tender), pursuant to and in accordance with the
terms of the Offer, as soon as practicable after commencement of the Offer but
in no event later than five business days after the date of commencement of the
Offer, the Tender Shares by physical delivery of the certificates therefor and
to not withdraw such Tender Shares, except following termination of this
Agreement pursuant to Section 2 hereof. Seller hereby acknowledges and agrees
that Parent's and the Purchaser's obligation to accept for payment and pay for
the Tender Shares is subject to the terms and conditions of the Offer. Seller
hereby permits Parent and the Purchaser to publish and disclose in the Offer
Documents and, if approval of the Company's stockholders is required under
applicable law, the Proxy Statement (including all documents and schedules filed
with the Securities and Exchange Commission) his identity and ownership of the
Tender Shares and the nature of his commitments, arrangements and understandings
under this Agreement.
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      1.2 Voting. Seller hereby agrees that, during the time this Agreement is
in effect, at any meeting of the shareholders of the Company, however called,
Seller shall (a) vote the Tender Shares in favor of the Merger; (b) vote the
Tender Shares against any action or agreement that would result in a breach of
any covenant, representation or warranty or any other obligation or agreement of
the Company under the Merger Agreement; and (c) vote the Tender Shares against
any action or agreement (other than the Merger Agreement or the transactions
contemplated thereby) that would impede, interfere with, delay, postpone or
attempt to discourage the Merger or the Offer, including, but not limited to:
(i) any extraordinary corporate transaction, such as a merger, consolidation or
other business combination involving the Company or any of its subsidiaries;
(ii) a sale or transfer of a material amount of assets of the Company or any of
its subsidiaries or a reorganization, recapitalization or liquidation of the
Company and its subsidiaries; (iii) any change in the management or board of
directors of the Company, except as otherwise agreed to in writing by the
Purchaser; (iv) any material change in the present capitalization or dividend
policy of the Company; or (v) any other material change in the Company's
corporate structure or business. Seller hereby revokes any proxy previously
granted by him with respect to the Tender Shares.

      1.3 Grant of Irrevocable Proxy; Appointment of Proxy.

      (i) Seller hereby irrevocably grants to, and appoints, William H. Flores
and James E. Brasher, or either of them, in their respective capacities as
officers or directors of Parent, and any individual who shall hereafter succeed
to any such office or directorship of Parent, and each of them individually,
Seller's proxy and attorney-in-fact (with full power of substitution), for and
in the name, place and stead of Seller, to vote the Tender Shares in favor of
the Merger and other transactions contemplated by the Merger Agreement, against
any Acquisition Transaction and otherwise as contemplated by Section 1.2.

      (ii) Seller represents that any proxies heretofore given in respect of the
Tender Shares are not irrevocable, and that any such proxies are hereby revoked.

      (iii) Seller understands and acknowledges that Parent is entering into the
Merger Agreement in reliance upon Seller's execution and delivery of this
Agreement. Seller hereby affirms that the irrevocable proxy set forth in this
Section 1.3 is given in connection with the execution of the Merger Agreement,
and that such irrevocable proxy is given to secure the performance of the duties
of Seller under this Agreement. Seller hereby further affirms that the
irrevocable proxy is coupled with an interest and may under no circumstances be
revoked. Seller hereby ratifies and confirms all that such irrevocable proxy may
lawfully do or cause to be done by virtue hereof. Such irrevocable proxy is
executed and intended to be irrevocable in accordance with the provisions of
Section 212(e) of the Delaware General Corporation Law.

      1.4 No Inconsistent Arrangements. Seller hereby covenants and agrees that,
except as contemplated by this Agreement and the Merger Agreement, it shall not
(i) transfer (which term shall include, without limitation, any sale, gift,
pledge or other disposition), or consent to any transfer of, any or all of the
Tender Shares or any interest therein, (ii) enter into any contract, option or
other agreement or understanding with respect to any transfer of any or all


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of the Tender Shares or any interest therein, (iii) grant any proxy,
power-of-attorney or other authorization in or with respect to the Tender
Shares, (iv) deposit the Tender Shares into a voting trust or enter into a
voting agreement or arrangement with respect to the Tender Shares or (v) take
any other action that would in any way restrict, limit or interfere with the
performance of his obligations hereunder or the transactions contemplated hereby
or by the Merger Agreement or which would make any representation or warranty of
Seller hereunder untrue or incorrect.

      1.5 No Solicitation. Seller hereby agrees that Seller shall not, and shall
not permit or authorize any of his affiliates, representatives or agents to,
directly or indirectly, encourage, solicit, explore, participate in or initiate
discussions or negotiations with, or provide or disclose any information to, any
corporation, partnership, person or other entity or group (other than Parent,
the Purchaser or any of their affiliates or representatives) concerning any
Acquisition Transaction or enter into any agreement, arrangement or
understanding requiring the Company to abandon, terminate or fail to consummate
the Merger or any other transactions contemplated by the Merger Agreement.
Seller will immediately cease any existing activities, discussions or
negotiations with any parties conducted heretofore with respect to any
Acquisition Transaction. From and after the execution of this Agreement, Seller
shall immediately advise Parent in writing of the receipt, directly or
indirectly, of any inquiries, discussions, negotiations or proposals relating to
an Acquisition Transaction, identify the offeror and furnish to Parent a copy of
any such proposal or inquiry, if it is in writing, or a written summary of any
oral proposal or inquiry relating to an Acquisition Transaction. Seller shall
promptly advise Parent in writing of any development relating to such proposal,
including the results of any discussions or negotiations with respect thereto.
Any action taken by the Company or any member of the Board of Directors of the
Company including, if applicable, Seller acting in such capacity, in accordance
with the proviso to the second sentence of Section 6.10(a) of the Merger
Agreement shall be deemed not to violate this Section 1.5.

      1.6 Reasonable Best Efforts. Subject to the terms and conditions of this
Agreement, Seller hereby agrees to use all reasonable best efforts to take, or
cause to be taken, all actions, and to do, or cause to be done, all things
necessary, proper or advisable under applicable laws and regulations to
consummate and make effective the transactions contemplated by this Agreement
and the Merger Agreement. Seller shall promptly consult with Parent and provide
any necessary information and material with respect to all filings made by
Seller with any Governmental Entity in connection with this Agreement and the
Merger Agreement and the transactions contemplated hereby and thereby.

      1.7 Waiver of Appraisal Rights. Seller hereby waives any rights of
appraisal or rights to dissent from the Merger that he may have.

      2. Expiration. This Agreement and Seller's obligation to tender provided
hereto shall terminate on the earlier of the payment for the Shares pursuant to
the Offer and the termination of the Merger Agreement in accordance with its
terms.


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      3. Representation and Warranties. Seller hereby represents and warrants to
Parent as follows:

            (a) Title. Seller has good and valid title to the Tender Shares,
      free and clear of any lien, pledge, charge, encumbrance or claim of
      whatever nature and, upon the purchase of the Tender Shares by the
      Purchaser, Seller will deliver good and valid title to the Tender Shares,
      free and clear of any lien, charge, encumbrance or claim of whatever
      nature.

            (b) Ownership of Shares. On the date hereof, the Owned Shares are
      owned of record or beneficially by Seller and, on the date hereof, the
      Owned Shares constitute all of the Shares owned of record or beneficially
      by Seller. Seller has sole voting power and sole power of disposition with
      respect to all of the Owned Shares, with no restrictions, subject to
      applicable federal securities laws, on Seller's rights of disposition
      pertaining thereto.

            (c) Power; Binding Agreement. Seller has the legal capacity, power
      and authority to enter into and perform all of his obligations under this
      Agreement. The execution, delivery and performance of this Agreement by
      Seller will not violate any other agreement to which Seller is a party
      including, without limitation, any voting agreement, stockholders
      agreement or voting trust. This Agreement has been duly and validly
      executed and delivered by Seller and constitutes a valid and binding
      agreement of Seller, enforceable against Seller in accordance with its
      terms.

            (d) No Conflicts. Other than in connection with or in compliance
      with the provisions of the Exchange Act and the HSR Act, no authorization,
      consent or approval of, or filing with, any court or any public body or
      authority is necessary for the consummation by Seller of the transactions
      contemplated by this Agreement. The execution, delivery and performance of
      this Agreement and the consummation of the transactions contemplated
      hereby will not constitute a breach, violation or default (or any event
      which, with notice or lapse of time or both, would constitute a default)
      under, or result in the termination of, or accelerate the performance
      required by, or result in a right of termination or acceleration under, or
      result in the creation of any lien, encumbrance, pledge, charge or claim
      upon any of the properties or assets of Seller under, any note, bond,
      mortgage, indenture, deed of trust, license, lease, agreement or other
      instrument to which Seller is a party or by which his properties or assets
      are bound.

            (e) No Finder's Fees. No broker, investment banker, financial
      advisor or other person is entitled to any broker's, finder's, financial
      adviser's or other similar fee or commission in connection with the
      transactions contemplated hereby based upon arrangements made by or on
      behalf of Seller.


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      4. Additional Shares. Seller hereby agrees, while this Agreement is in
effect, to promptly notify Parent of the number of any new Shares acquired by
Seller, if any, after the date hereof.

      5. Further Assurances. From time to time, at the Parent's request and
without further consideration, Seller shall execute and deliver such additional
documents and take all such further action as may be reasonably necessary or
desirable to consummate and make effective the transactions contemplated by
Section 1 of this Agreement.

      6. Miscellaneous.

      6.1 Non-Survival. The representations and warranties made herein shall
terminate upon Seller's sale of the Tender Shares to the Purchaser in the Offer,
other than Seller's representation and warranty in Section 3.2(a), which shall
survive the sale of the Tender Shares and the termination of this Agreement
following such sale.

      6.2 Entire Agreement; Assignment. This Agreement (i) constitutes the
entire agreement between the parties with respect to the subject matter hereof
and supersedes all other prior agreements and understandings, both written and
oral, between the parties with respect to the subject matter hereof and (ii)
shall not be assigned by operation of law or otherwise, provided that Parent may
assign its rights and obligations hereunder to any direct or indirect wholly
owned subsidiary of Parent, but no such assignment shall relieve Parent of its
obligations hereunder if such assignee does not perform such obligations.

      6.3 Amendments. This Agreement may not be modified, amended, altered or
supplemented, except upon the execution and delivery of a written agreement
executed by the parties hereto.

      6.4 Notices. All notices, requests, claims, demands and other
communications hereunder shall be in writing and shall be given by hand
delivery, telegram, telex or telecopy or by any courier service, such as Federal
Express, providing proof of delivery. All communications hereunder shall be
delivered to the respective parties at the following addresses:

   If to Seller:







   copy to Seller's Counsel:



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         If to Parent:

                           Western Atlas Inc.
                           10205 Westheimer Road
                           Houston, Texas  77042-3115
                           Attention:  James E. Brasher, Esq.
                           Fax:  (713) 266-1717
         copy to:

                           Wachtell, Lipton, Rosen & Katz
                           51 West 52nd Street
                           New York, New York  10019
                           Attention:  Daniel A. Neff, Esq.
                           Fax:  (212) 403-2000

or to such other address as the person to whom notice is given may have
previously furnished to the others in writing in the manner set forth above.

      6.5 Governing Law. This Agreement shall be governed by and construed in
accordance with the laws of the State of Delaware, regardless of the laws that
might otherwise govern under applicable principles of conflicts of laws thereof.

      6.6 Specific Performance. Seller recognizes and acknowledges that a breach
by him of any covenants or agreements contained in this Agreement will cause
Parent to sustain damages for which it would not have an adequate remedy at law
for money damages, and therefore Seller agrees that in the event of any such
breach Parent shall be entitled to the remedy of specific performance of such
covenants and agreements and injunctive and other equitable relief in addition
to any other remedy to which it may be entitled, at law or in equity.

      6.7 Counterparts. This Agreement may be executed in two counterparts, each
of which shall be deemed to be an original, but both of which shall constitute
one and the same Agreement.

      6.8 Descriptive Headings. The descriptive headings used herein are
inserted for convenience of reference only and are not intended to be part of or
to affect the meaning or interpretation of this Agreement.

      6.9 Severability. Whenever possible, each provision or portion of any
provision of this Agreement will be interpreted in such manner as to be
effective and valid under applicable law but if any provision or portion of any
provision of this Agreement is held to be invalid, illegal or unenforceable in
any respect under any applicable law or rule in any jurisdiction, such
invalidity, illegality or unenforceability will not affect any other provision
or portion of any provision in such jurisdiction, and this Agreement will be
reformed, construed and enforced in such jurisdiction as if such invalid,
illegal or unenforceable provision or portion of any provision had never been
contained herein.


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      IN WITNESS WHEREOF, Parent and Seller have caused this Agreement to be
duly executed as of the day and year first above written.



                                           WESTERN ATLAS INC.

                                           By:
                                               ---------------------------------
                                               Name:
                                               Title:


                                           SELLER

                                                    ----------------------------
                                                    Name:

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