SECURITY AGREEMENT


         THIS SECURITY AGREEMENT dated as of May 29, 1996, is by and between 3-D
GEOPHYSICAL,  INC., a Delaware  corporation (the "Debtor") whose address is 7076
S. Alton Way,  Englewood,  Colorado 80112,  and FIRST  INTERSTATE BANK OF TEXAS,
N.A., a national  banking  association  ("Secured  Party") whose address is 1000
Louisiana, Houston, Texas.

                                R E C I T A L S:

         A.  Debtor  and  Secured  Party have  entered  into that  certain  Loan
Agreement dated of even date herewith (such Loan  Agreement,  as the same may be
amended or  modified  from time to time,  being  hereinafter  referred to as the
"Loan Agreement") pursuant to which Secured Party has agreed to make a revolving
credit  loan  to  Borrower  in the  aggregate  principal  amount  not to  exceed
$3,000,000.00 and a term loan to Borrower in the aggregate  principal amount not
to  exceed  $15,000,000.00,  subject  to the terms  and  conditions  of the Loan
Agreement.

         B.  Secured  Party  has  conditioned  its  obligations  under  the Loan
Agreement upon the execution and delivery of this Agreement by Debtor.

         NOW  THEREFORE,  in  consideration  of the  premises and other good and
valuable  consideration,  the  receipt  and  sufficiency  of  which  are  hereby
acknowledged, the parties hereto agree as follows:

                                    ARTICLE I

                                   Definitions

         Section 1.1 Definitions. All terms used herein which are defined in the
Uniform  Commercial Code as adopted and in effect from time to time in the State
of Texas ("UCC")  shall have the same  meanings  herein as in the UCC unless the
context in which such terms are used herein indicates otherwise. All capitalized
terms used but not otherwise defined herein or which are defined in the UCC that
are defined in the Loan Agreement shall have the meanings ascribed to such terms
in the Loan  Agreement,  the  applicable  provisions of which Loan Agreement are
incorporated herein.

                                   ARTICLE II

                                Security Interest

          Section  2.1  Security  Interest.  To secure  the prompt  payment  and
performance in full of the Obligations,  Debtor hereby grants to Secured Party a
security interest in, and assigns and pledges,  the following property,  whether
now owned or existing or hereafter arising or acquired








and wherever  arising or located  (such  property  being  hereinafter  sometimes
called the "Collateral"):

              (a) all accounts,  accounts  receivable,  documents,  instruments,
         chattel  paper,  general  intangibles  of  Debtor,  including,  without
         limitation, all income tax returns, copyrights, patents, patent rights,
         trademarks,  tradenames,  tradestyles,  goodwill,  going concern value,
         franchise  and  distributorship   agreements,   whether  now  owned  or
         hereafter acquired, and all products and proceeds thereof;

              (b) all equipment,  inventory,  machinery, and fixtures of Debtor,
         whether now owned or hereafter acquired, and all accessions thereto and
         all products and proceeds thereof;

              (c) all  investment  property  of  Debtor,  whether  now  owned or
         hereafter  acquired,  and all  accessions  thereto and all products and
         proceeds thereof;

              (d)  the  Lockbox  Account,  any  other  deposit  accounts  now or
         hereafter  maintained  by Debtor at or with Secured Party and all cash,
         checks,  instruments,  securities,  funds and monies  now or  hereafter
         deposited in the foregoing; and

              (e) all books and records (including computer software, diskettes,
         information  stored  in  computers  and  the  like)  pertaining  to the
         property described in clauses (a) and (d) above.

         Section  2.1 Debtor  Remains  Liable.  Notwithstanding  anything to the
contrary  contained  herein,  (a) the  Debtor  shall  remain  liable  under  the
contracts  and  agreements  included in the  Collateral  to the extent set forth
therein to perform  all of its duties  and  obligations  thereunder  to the same
extent as if this  Agreement  had not been  executed,  (b) the  exercise  by the
Secured Party of any of its rights  hereunder  shall not release the Debtor from
any of its duties or obligations under the contracts and agreements  included in
the  Collateral,  and (c) the  Secured  Party shall not have any  obligation  or
liability  under any of the contracts and agreements  included in the Collateral
by reason of this Agreement, nor shall the Secured Party be obligated to perform
any of the obligations or duties of the Debtor  thereunder or to take any action
to collect or enforce any claim for payment assigned hereunder.

                                   ARTICLE III

                      Representations and Warranties; Etc.

         To  induce  Secured  Party to enter  into this  Agreement  and the Loan
Agreement,  represents  and warrants to, and covenants and agrees with,  Secured
Party that:



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         Section 3.1 Title.  Except for the security  interest  granted  herein,
Debtor  owns,  and with  respect to  Collateral  acquired  after the date hereof
Debtor will own, the Collateral free and clear of any Lien, other than Permitted
Liens.

         Section 3.2  Accounts.  Unless  Debtor has given  Secured Party written
notice  to the  contrary,  whenever  the  security  interest  granted  hereunder
attaches to an account, Debtor shall be deemed to have represented and wan-anted
to Secured  Party as to each and all of its  accounts  that (i) each  account is
genuine and in all respects what it purports to be, (ii) each account represents
the legal,  valid,  and  binding  obligation  of the account  debtor  evidencing
indebtedness  unpaid  and  owed  by  such  account  debtor  arising  out  of the
performance  of labor or  services  by  Debtor  or the sale or lease of goods by
Debtor,  (iii) the amount of each  account  represented  as owing is the correct
amount  actually and  unconditionally  owing  except for normal trade  discounts
granted in the ordinary  course of  business,  and (iv) no account is subject to
any offset counterclaim, or other defense.

         Section 3.3  Financing  Statements.  No financing  statement,  security
agreement,  or other lien instrument  covering all or any part of the Collateral
is on file in any  public  office,  except  as may have  been  filed in favor of
Secured Party pursuant to this Agreement.

         Section 3.4  Organization  and Authority.  Debtor is a corporation duly
organized, validly existing, and in good standing under the laws of its state of
incorporation.  Debtor  has the  partnership  power and  authority  to  execute,
deliver,  and  perform  this  Agreement,   and  the  execution,   delivery,  and
performance  of this  Agreement by Debtor have been  authorized by all necessary
corporate  action on the part of Debtor and do not and will not violate any law,
rules or regulation or  partnership  agreement of Debtor and do not and will not
conflict  with,  result  in a breach  of,  or  constitute  a  default  under the
provisions of any indenture,  mortgage,  deed of trust,  security agreement,  or
other instrument or agreement pursuant to which Debtor or any of its property is
bound.

         Section  3.5  Principal  Place  of  Business.  The  principal  place of
business and chief executive office of Debtor, and the office where Debtor keeps
its books  and  records,  is  located  at the  address  of  Debtor  shown at the
beginning of this Agreement.

         Section 3.6 Location of Collateral;  Markings.  Debtor intends to place
all or part of the  Collateral  on  certain  vessels  (collectively,  "Vessel").
Debtor shall advise and notify  Secured Party in writing from time to time,  and
at any time upon Secured  Party's  request,  the name, flag and name of owner of
the  Vessels on which the  Collateral  is located;  or, if not on a Vessel,  the
other  location of such  Collateral.  Debtor  agrees to mark all  equipment  and
inventory  Co now or  hereafter  located on a Vessel with a prominent  nameplate
indicating  that the Debtor owns such  Collateral  and Secured  Party has a Lien
thereon.


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         Section 3.7 Intellectual Property. No patents, trademarks,  copyrights,
rights of use or other intellectual property are necessary,  advisable or useful
for the conduct of Debtor's business and Debtor has none of the same.

         Section  3.8  Perfection.  Upon the filing of Uniform  Commercial  Code
financing  statements in the jurisdictions listed on Schedule 2 attached hereto,
and upon the Secured Party's obtaining possession of all documents, instruments,
and chattel paper of the Debtor,  the security  interest in favor of the Secured
Party  created  herein  will  constitute  a valid  and  perfected  Lien upon and
security interest in the Collateral, subject to no equal or prior Lien.

         Section 3.9  Inventory.  All  inventory has been produced in compliance
with all requirements of the Fair Labor Standards Act.

         Section 3.10 Intellectual Property. No patents, trademarks, copyrights,
rights of use or other intellectual property are necessary,  advisable or useful
for the conduct of Debtor's business and Debtor has none of the same.

                                   ARTICLE IV

                                    Covenants

         Debtor   covenants  and  agrees  with  Secured  Party  that  until  the
Obligations are paid and performed in full:

         Section 4.1  Maintenance.  Debtor shall maintain the Collateral in good
operating  condition and repair and shall not permit any waste or destruction of
the  Collateral  or any  part  thereof.  Debtor  shall  not  use or  permit  the
Collateral to be used in violation of any law or  inconsistently  with the terms
of any policy of insurance.  Debtor shall not use or permit the Collateral to be
used in any  manner  or for any  purpose  that  would  impair  the  value of the
Collateral or expose the Collateral to unusual risk.

         Section  4.2  Liens  and  Encumbrances.   (a)  Neither  Debtor,  owner,
charterer,  agent,  master,  nor any member of the crew of any Vessel  has,  nor
shall  have,  any right,  power or  authority  to create,  incur or permit to be
placed or imposed on any  Collateral,  or any part thereof,  any lien whatsoever
other than to Secured  Party.  Debtor shall defend the Collateral  against,  any
lien,  security  interest,  or other  encumbrance on the  Collateral  except the
security  interest of Secured Party hereunder,  and shall defend Debtor's rights
in the  Collateral  and Secured  Party's  security  interest  in the  Collateral
against the claims of all persons and  entities.  Debtor  shall  further  obtain
consent from the owner of each of the Vessel,  each  mortgagee of real  property
owned by Debtor,  and each landlord of real property leased by Debtor upon which
any  Collateral is located not to create,  permit,  or suffer to exist any lien,
security interest, or other encumbrances on the Collateral.


                                       -4-








          (b) Debtor  shall  promptly pay and  discharge,  or caused to be paid,
discharged and released, any and all taxes,  assessments,  governmental charges,
fines,  penalties, or Liens that may attach to or be imposed upon the Collateral
by virtue that the  Collateral is located on the Vessel.  If any Vessel shall be
detained, seized, levied upon or taken into custody under process or under color
of any  authority,  Debtor shall  promptly  notify  Secured Party in writing and
shall promptly cause the Vessel to be discharged or released therefrom.

         Section 4.3 Modification of Accounts. Debtor shall do nothing to impair
the rights of Secured Party in the  Collateral.  The Debtor shall, in accordance
with prudent  business  practices,  endeavor to collect or cause to be collected
from each  account  debtor  under  its  accounts,  as and when due,  any and all
amounts owing under such accounts.  Without the prior written consent of Secured
Party,  Debtor  shall not (a) grant any  extension  of time for any payment with
respect  to  the  Accounts,  (b)  compromise,  compound,  or  settle  any of the
Accounts,  (c)  release  in whole or in part any  person  or entity  liable  for
payment  with  respect to the  Accounts,  (d) allow any credit or  discount  for
payment  with  respect to the  Accounts  other than (i) normal  trade  discounts
granted in the  ordinary  course of  business  or (ii)  discounts  not to exceed
(without  Secured  Party's  consent)  $150,000  individually  or $400,000 in the
aggregate that are given to avoid a greater loss or maximize  recovery of monies
due to  Debtor,  or (e)  release  any lien,  security  interest,  or  assignment
securing the Accounts, or otherwise amend or modify any of the Accounts.

         Section 4.4 Disposition of Collateral. Debtor shall not sell, lease, or
otherwise  dispose  of the  Collateral  or any part  thereof  without  the prior
written  consent of Secured  Party,  except  Debtor  may sell  inventory  in the
ordinary course of business.

         Section 4.5 Further Assurances. At any time and from time to time, upon
the request of Secured  Party,  and at the sole expense of Debtor,  Debtor shall
promptly execute and deliver all such further instruments and documents and take
such further action as Secured Party may deem necessary or desirable to preserve
and perfect its security interest in the Collateral and carry out the provisions
and purposes of this Agreement, including, without limitation, the execution and
filing of such  financing  statements  as Secured  Party may require.  A carbon,
photographic,  or  other  reproduction  of this  Agreement  or of any  financing
statement  covering the  Collateral or any part thereof shall be sufficient as a
financing  statement  and may be filed as a financing  statement.  Debtor  shall
promptly  endorse and deliver to Secured Party all documents,  instruments,  and
chattel paper that it now owns or may hereafter acquire.

         Section 4.6 Risk of Loss;  Insurance.  Debtor shall be responsible  for
any loss of or damage to the Collateral. Debtor shall maintain, with financially
sound and reputable  companies,  insurance  policies (i) insuring the Collateral
against all marine risks, loss by fire,  explosion,  theft, and such other risks
and casualties as are customarily  insured  against by companies  engaged in the
same or a similar  business,  and (ii) insuring Debtor and Secured Party against
liability for personal  injury and property  damage  relating to the Collateral,
such policies to be in such amounts and covering  such risks as are  customarily
insured  against by companies  engaged in the same or a similar  business,  with
losses payable to Debtor and Secured Party as their respective interests

                                       -5-








may appear and with the  Secured  Party  being  named as an  additional  assured
thereunder.  All insurance with respect to the Collateral  shall provide that no
cancellation,  reduction  in  amount,  or change in  coverage  thereof  shall be
effective  unless  Secured  Party has  received  30 days  prior  written  notice
thereof.  Debtor shall deliver to Secured Party copies of all insurance policies
covering the Collateral or any part thereof.

         Section 4.7 Warehouse  Receipts  Non-Negotiable.  Debtor agrees that if
any warehouse  receipt or receipt in the nature of a warehouse receipt is issued
with respect to any of its inventory,  such warehouse  receipt or receipt in the
nature thereof shall not be "negotiable"  (as such term is used in Section 7-104
of the Uniform Commercial Code as adopted by the State of Texas).

         Section 4.8 Inspection  Rights.  Debtor shall permit and obtain consent
from the Vessel Owner to permit Secured Party and its representatives to examine
or inspect the Collateral  wherever  located and to examine,  inspect,  and copy
Debtor's books and records at any reasonable  time and as often as Secured Party
may desire.

         Section 4.9 Vessel Owner,  Mortgagee and Landlord Waivers,  Etc. Debtor
shall  cause  each  owner of a Vessel  on,  which the  Collateral  is located to
execute and deliver  instruments  satisfactory  in form and substance to Secured
Party pursuant to which such Vessel owner (i) waives its rights,  if any, in the
Collateral,  (ii)  confirms  that it will not  create,  incur or place  upon any
Collateral  located  on  its  Vessel  any  Lien,  security  interest,  or  other
encumbrance,  (iii)  covenants  not to remove  the Vessel  from the  territorial
waters of the  United  States,  Canada  or Mexico in the Gulf of Mexico  without
prior written notification to Secured Party, (iv) confirms that there is no Lien
upon the Vessel or that it has notified the holder of the Lien that the Debtor's
Property located thereon is not the owner's nor the Vessel's,  and (v) covenants
not to abandon a Vessel in any port.  Debtor shall cause each  mortgagee of real
property owned by Debtor and each landlord of real property leased by the Debtor
upon which any of the  Collateral is located to execute and deliver  instruments
satisfactory  in form and  substance  to Secured  Party  pursuant  to which such
mortgagee or landlord (i) waives its rights, if any, in the Collateral, and (ii)
confirms that it will not create,  incur or place upon any Collateral located on
its property any Lien, security interest, or other encumbrance.

         Section  4.10  Taxes.  Debtor  agrees  to pay  or  discharge  prior  to
delinquency  all taxes,  assessments,  levies,  and other  governmental  charges
imposed on it or its  property,  except  Debtor  shall not be required to pay or
discharge any tax,  assessment,  levy, or other  governmental  charge if (i) the
amount or  validity  thereof  is being  contested  by  Debtor  in good  faith by
appropriate proceedings diligently pursued, (ii) such proceedings do not involve
any risk of sale, forfeiture, or loss of the Collateral or any interest therein,
and (iii) adequate  reserves  therefor have been  established in conformity with
GAAP.

         Section  4.11  Obligations.  Debtor shall duly and  punctually  pay and
perform the Obligations.

                                       -6-









         Section 4.12  Notification.  Debtor shall promptly notify Secured Party
of (i) any Lien made or  threatened  against the  Collateral,  (ii) any material
change in the Collateral,  including, without limitation, any material damage to
or loss of the Collateral, and (iii) the occurrence or existence of any Event of
Default or the occurrence or existence of any condition or event that,  with the
giving of notice or lapse of time or both, would be an Event of Default.

         Section  4.13  Corporate  Changes.  Debtor  shall not  change its name,
identity,  or corporate  structure  in any manner that might make any  financing
statement filed in connection with this Agreement  seriously  misleading  unless
Debtor shall have given Secured Party 30 days prior written  notice  thereof and
shall have  taken all  action  deemed  necessary  by Secured  Party to make each
financing  statement  not  seriously  misleading.  Debtor  shall not  change its
principal place of business, chief executive office, or the place where it keeps
its books and  records  unless it shall have given  Secured  Party 30 days prior
written  notice  thereof  and shall have taken all action  deemed  necessary  by
Secured Party to cause its security  interest in the  Collateral to be perfected
with the priority required by this Agreement.

         Section 4.14 Books and Records; Information. Debtor shall keep accurate
and  complete  books and records of the  Collateral  and  Debtor's  business and
financial condition in accordance with generally accepted accounting  principles
consistently  applied.  Debtor shall from time to time at the request of Secured
Party deliver to Secured Party such  information  regarding the  Collateral  and
Debtor as Secured Party may request,  including,  without limitation,  lists and
descriptions of the Collateral and evidence of the identity and existence of the
Collateral.  Debtor  shall mark its books and  records to reflect  the  security
interest of Secured Party under this Agreement.

         Section 4.15  Compliance  with  Agreements.  Debtor shall comply in all
material  respects with all mortgages,  deeds of trust,  instruments,  and other
agreements binding on it or affecting its properties or business.

         Section  4.16  Compliance  with  Laws.  Debtor  shall  comply  with all
applicable  laws,  rules,  regulations,  and orders of any court or governmental
authority.

         Section  4.17  Equipment  and  Inventory.  The  Debtor  shall  keep the
equipment and inventory at the locations specified on Schedule 1 hereto or, upon
30 days prior written notice to the Secured  Party,  at such other places within
the United  States of America  where all action  required to perfect the Secured
Party's  security  interest in the  equipment  and  inventory  with the priority
required by this Agreement shall have been taken.

         Section  4.18  Collection  of  Accounts.  Accounts  shall be  collected
through the Lockbox  (Secured Party,  recognizing  that some Accounts arising in
the first several months of this Agreement cannot effectively be directed to the
Lockbox). In connection with such collections,  the Debtor may take (and, at the
Secured Party's direction, shall take) such actions as the Debtor or the Secured
Party may deem necessary or advisable to enforce collection of the accounts.  In
addition  to the  foregoing,  the  Debtor  agrees  that if any  Proceeds  of any
Collateral (including

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payments  made in respect of  accounts)  shall be received by the Debtor  rather
than through the Lockbox, the Debtor shall promptly deliver such Proceeds to the
Secured Party with any necessary endorsements. Until such Proceeds are delivered
to the Secured Party, such Proceeds shall be held in trust by the Debtor for the
benefit of the Secured Party and shall not be commingled with any other funds or
property of the Debtor. All Proceeds of Collateral received by the Secured Party
pursuant to this Section may be applied by the Secured Party to the  Obligations
in such order and manner as. the Secured Party may elect in its sole discretion.

         Section 4.19 Location of  Collateral.  Debtor shall not move any of the
Collateral  from the Vessel or Vessels  identified  hereunder  without the prior
written consent of Secured Party.

         Section 4.20 Lockbox Account.  The Debtor agrees to notify each account
debtor and other obligors to deliver all payments and amounts owed to the Debtor
directly  to the  Lockbox  and to  renotify,  from time to time and in any event
promptly upon request of the Secured Party,  those account  debtors and obligors
who do not deliver all payments  due to the Debtor  directly to the Lockbox that
the same must be delivered to the Lockbox (the Secured  Party being granted such
renotification right if the Debtor fails or refuses so to do). The Lockbox shall
be under the sole control of the Secured  Party.  The Debtor shall have no right
to effect  withdrawals from the Lockbox Account and the Lockbox Account shall be
maintained  in the name and under the domain and control of the  Secured  Party.
After  Default and upon  instructions  from I/O,  funds to be  disbursed  to the
Borrower may be restricted or applied to the Obligations, or both.

                                    ARTICLE V

                             Rights of Secured Party

         Section 5.1 Power of Attorney.  Debtor hereby  irrevocably  constitutes
and appoints Secured Party and any officer or agent thereof,  with full power of
substitution,  as its true and  lawful  attorney-in-fact  with full  irrevocable
power and  authority  in the name of Debtor or in its own name,  to take any and
all action and to execute any and all  documents and  instruments  which Secured
Party  at any time  and  from  time to time  deems  necessary  or  desirable  to
accomplish the purposes of this Agreement and,  without  limiting the generality
of the  foregoing,  Debtor  hereby  gives  Secured  Party the power and right on
behalf of Debtor and in its own name to do any of the following,  without notice
to or the consent of Debtor:

              (i) to demand, sue for, collect,  or receive in the name of Debtor
         or in its own  name,  any  money or  property  at any time  payable  or
         receivable on account of or in exchange for any of the Collateral  and,
         in connection therewith,  endorse checks,  notes, drafts,  acceptances,
         money  orders,  documents of title,  or any other  instruments  for the
         payment of money under the Collateral or any policy of insurance;

              (ii) to pay or discharge  taxes,  liens,  security  interests,  or
         other  encumbrances  levied  or  placed on or  threatened  against  the
         Collateral;

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              (iii) to send  requests for  verification  to account  debtors and
         other obligors;

              (iv) to notify post office  authorities  to change the address for
         delivery of mail of Debtor to an address  designated  by Secured  Party
         and to receive, open, and dispose of mail addressed to Debtor;

              (v) (A) to direct account debtors and any other parties liable for
         any payment under any of the  Collateral to make payment of any and all
         monies due and to become due thereunder directly to Secured Party or as
         Secured Party shall direct;  (B) to receive  payment of and receipt for
         any and all monies,  claims, and other amounts due and to become due at
         any time in respect of or arising  out of any  Collateral;  (C) to sign
         and endorse any invoices,  freight or express  bills,  bills of lading,
         storage or warehouse  receipts,  drafts against  debtors,  assignments,
         proxies,  stock powers,  verifications,  and notices in connection with
         accounts  and  other  documents  relating  to  the  Collateral;  (D) to
         commence and  prosecute  any suit,  action,  or proceeding at law or in
         equity in any court of competent jurisdiction to collect the Collateral
         or any part  thereof  and to enforce  any other right in respect of any
         Collateral;  (E) to defend  any suit,  action,  or  proceeding  brought
         against  Debtor  with  respect  to  any  Collateral;   (F)  to  settle,
         compromise,  or adjust any suit, action, or proceeding  described above
         and, in connection  therewith,  to give such  discharges or releases as
         Secured  Party  may  deem  appropriate;  (G)  to  exchange  any  of the
         Collateral   for  other   property  upon  any  merger,   consolidation,
         reorganization,  recapitalization,  or other readjustment of the issuer
         thereof and, in  connection  therewith,  deposit any of the  Collateral
         with any committee,  depositary,  transfer agent,  registrar,  or other
         designated  agency upon such terms as Secured Party may determine;  (H)
         to add or release any guarantor,  endorser,  surety,  or other party to
         any of the  Collateral or the  Obligations;  (I) to renew,  extend,  or
         otherwise  change the terms and  conditions of any of the Collateral or
         Obligations;  (J) to insure, and to make, settle, compromise, or adjust
         claims under any insurance policy covering, any of the Collateral;  and
         (K) to sell,  transfer,  pledge,  make any agreement with respect to or
         otherwise  deal with any of the  Collateral as fully and  completely as
         though  Secured Party were the absolute owner thereof for all purposes,
         and to do, at Secured Party's option and Debtors expense,  at any time,
         or from time to time,  all acts and things  which  Secured  Party deems
         necessary  to protect,  preserve,  or realize upon the  Collateral  and
         Secured Party's security interest therein.

         This power of attorney is a power coupled with an interest and shall be
irrevocable.  Secured  Party shall be under no duty to exercise or withhold  the
exercise of any of the rights,  powers,  privileges,  and options  expressly  or
implicitly  granted to Secured Party in this Agreement,  and shall not be liable
for any  failure to do so or any delay in doing so.  SECURED  PARTY SHALL NOT BE
LIABLE FOR ANY ACT OR  OMISSION  OR FOR ANY ERROR OF  JUDGMENT OR ANY MISTAKE OF
FACT OR LAW IN ITS  INDIVIDUAL  CAPACITY OR IN ITS CAPACITY AS  ATTORNEY-IN-FACT
EXCEPT ACTS OR OMISSIONS  RESULTING FROM ITS GROSS NEGLIGENCE  MISCONDUCT.  This
power

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of attorney is  conferred  on Secured  Party  solely to protect,  preserve,  and
realize upon its security interest in the Collateral. Secured Party shall not be
responsible  for any  decline  in the value of the  Collateral  and shall not be
required  to take any steps to  preserve  rights  against  prior  parties  or to
protect, preserve, or maintain any security interest or lien given to secure the
Collateral.

         Section 5.2 Performance by Secured Party. If Debtor fails to perform or
comply with any of its agreements contained herein, Secured Party itself may, at
its sole  discretion,  cause or attempt to cause  performance or compliance with
such agreement and the expenses of Secured Party, together with interest thereon
at the maximum  nonusurious per annum rate permitted by applicable law, shall be
payable by Debtor to Secured  Party on demand and shall  constitute  Obligations
secured by this Agreement. Notwithstanding the foregoing, it is expressly agreed
that  Secured  Party  shall not have any  liability  or  responsibility  for the
performance of any obligation of Debtor under this Agreement.

         Section 5.3 Setoff; Property Held by Secured Party. Secured Party shall
have the right to set off and apply  against  the  Obligations,  at any time and
without notice to Debtor,  and is hereby granted a contractual Lien and right to
setoff, any and all deposits (general or special, time or demand, provisional or
final) or other  sums at any time  credited  by or owing from  Secured  Party to
Debtor whether or not the Obligations  are then due. As additional  security for
the Obligations,  Debtor hereby grants Secured Party a security  interest in all
money,  instruments,  and other  property  of Debtor  now or  hereafter  held by
Secured Party, including,  without limitation,  property held in safekeeping. In
addition  to Secured  Party's  right of setoff and as further  security  for the
Obligations,  Debtor  hereby  grants  Secured  Party a security  interest in all
deposits  (general or special,  time or demand,  provisional or final) and other
accounts of Debtor now or hereafter  deposited with or held by Secured Party and
all other sums at any time  credited by or owing from  Secured  Party to Debtor.
The rights and  remedies  of Secured  Party  hereunder  are in addition to other
rights and  remedies  (including,  without  limitation,  other rights of setoff)
which Secured Party may have.

         Section 5.4 Assignment by Secured Party. Secured Party may from time to
time assign the  Obligations  and any portion  thereof and/or the Collateral and
any portion thereof, and the assignee shall be entitled to all of the rights and
remedies of Secured Party under this Agreement in relation thereto.

                                   ARTICLE VI

                                     Default

         Section 6.1 Upon the  occurrence of an Event of Default,  Secured Party
shall have the  following  rights and remedies and may do any one or more of the
following:

              (i) Secured Party may declare the  Obligations or any part thereof
         immediately  due and  payable,  without  notice,  demand,  presentment,
         notice of dishonor, notice of

                                      -10-








         acceleration,  notice  of  intent  to  accelerate,  notice of intent to
         demand,  protest,  or other  formalities  of any kind, all of which are
         hereby expressly  waived by Debtor;  provided,  however,  that upon the
         occurrence  of an Event of  Default  under  Section  9.1(d) or  Section
         9.1(e) of the Loan Agreement,  the Obligations shall become immediately
         due  and  payable  without  notice,  demand,  presentment,   notice  of
         dishonor,  notice of  acceleration,  notice  of  intent to  accelerate,
         notice of intent to demand,  protest, or other formalities of any kind,
         all of which are hereby expressly waived by Debtor.

              (ii) In  addition  to all other  rights  and  remedies  granted to
         Secured  Party  in  this  Agreement  and in  any  other  instrument  or
         agreement securing,  evidencing,  or relating to the Obligations or any
         part  thereof,  Secured Party shall have all of the rights and remedies
         of a  secured  party  under the UCC as  adopted  by the State of Texas.
         Without limiting the generality of the foregoing, Secured Party may (A)
         without  demand  or  notice  to  Debtor,  collect,   receive,  or  take
         possession  of the  Collateral or any part thereof and for that purpose
         Secured  Party may enter upon any premises on which the  Collateral  is
         located and remove the  Collateral  therefrom or render it  inoperable,
         and/or (B) sell, lease, or otherwise dispose of the Collateral,  or any
         part  thereof,  in one or more  parcels  at public or  private  sale or
         sales, at Secured Party's offices or elsewhere, for cash, on credit, or
         for future  delivery.  Upon the request of Secured Party,  Debtor shall
         assemble the  Collateral  and make it available to Secured Party at any
         place  designated  by Secured  Party that is  reasonably  convenient to
         Debtor and Secured Party. Debtor agrees that Secured Party shall not be
         obligated  to give more than five days  written  notice of the time and
         place of any public sale or of the time after  which any  private  sale
         may take place and that such notice shall constitute  reasonable notice
         of such  matters.  Debtor shall be liable for all expenses of retaking,
         holding,  preparing for sale,  or the like,  and all  attorneys'  fees,
         legal  expenses,  and all other costs and expenses  incurred by Secured
         Party in  connection  with the  collection of the  Obligations  and the
         enforcement  of Secured  Party's rights under this  Agreement.  Secured
         Party may apply the  Collateral  against the  Obligations in such order
         and manner as Secured  Party may elect in its sole  discretion.  Debtor
         shall remain  liable for any  deficiency if the proceeds of any sale or
         disposition of the Collateral are  insufficient  to pay the Obligations
         in full.  Debtor  waives  all rights of  marshalling  in respect of the
         Collateral.

              (iii) Secured Party may cause any or all of the Collateral held by
         it to be  transferred  into  the name of  Secured  Party or the name or
         names of Secured Party's nominee or nominees.

              (iv)  Secured  Party may  exercise  or cause to be  exercised  all
         voting rights and corporate powers in respect of the Collateral.


                                      -11-









                                   ARTICLE VII

                                  Miscellaneous

         Section 7.1 Expenses;  Indemnification.  Debtor agrees to pay on demand
all  costs  and  expenses  incurred  by  Secured  Party in  connection  with the
preparation,  negotiation,  and  execution  of the  Agreement  and  any  and all
amendments,  modifications,  and supplements hereto. Debtor agrees to pay and to
hold Secured  Party  harmless  from and against all fees and all excise,  sales,
stamp,  and  other  taxes  payable  in  connection  with this  Agreement  or the
transactions  contemplated  hereby.  Debtor hereby indemnifies Secured Party and
each affiliate  thereof and their  respective  officers,  directors,  employees,
attorneys, and agents from, and holds each of them harmless against, any and all
losses, liabilities,  claims, damages, penalties, judgments, costs, and expenses
(including  attorneys'  fees) to  which  any of them may  become  subject  which
directly or indirectly arise from or relate to (i) the  negotiation,  execution,
delivery, performance,  administration,  or enforcement of this Agreement or any
other  instrument  or  agreement  securing,   evidencing,  or  relating  to  the
Obligations or any part thereof,  (ii) any of the  transactions  contemplated by
this Agreement or any other  instrument or agreement  securing,  evidencing,  or
relating to the  Obligations or any part thereof,  (iii) any breach by Debtor of
any  representation,  warranty,  covenant,  or other agreement contained in this
Agreement or any other instrument or agreement securing, evidencing, or relating
to the Obligations or any part thereof,  or (iv) any investigation,  litigation,
or   other   proceeding,   including,   without   limitation,   any   threatened
investigation, litigation, or other proceeding relating to any of the foregoing.
WITHOUT  LIMITING ANY PROVISION OF THIS  AGREEMENT OR ANY OTHER  INSTRUMENT,  OR
AGREEMENT  SECURING,  EVIDENCING,  OR  RELATING TO THE  OBLIGATIONS  OR ANY PART
THEREOF,  IT IS THE EXPRESS  INTENTION OF THE PARTIES HERETO THAT EACH PERSON OR
ENTITY TO BE INDEMNIFIED  UNDER THIS SECTION SHALL BE INDEMNIFIED  FROM AND HELD
HARMLESS AGAINST ANY AND ALL LOSSES,  LIABILITIES,  CLAIMS, DAMAGES,  PENALTIES,
JUDGMENTS,  COSTS,  AND EXPENSES  (INCLUDING  ATTORNEYS' FEES) ARISING OUT OF OR
RESULTING FROM THE SOLE OR CONTRIBUTORY NEGLIGENCE OF THE PERSON OR ENTITY TO BE
INDEMNIFIED,  but no  indemnitee  shall  be  indemnified  for  their  own  gross
negligence or willful misconduct.

         Section 7.2 No Waiver;  Cumulative Remedies.  No failure on the part of
Secured Party to exercise and no delay in  exercising,  and no course of dealing
with respect to, any right,  power,  or  privilege  under this  Agreement  shall
operate as a waiver  thereof,  nor shall any single or partial  exercise  of any
right,  power, or privilege  under this Agreement  preclude any other or further
exercise  thereof or the exercise of any other right,  power, or privilege.  The
rights and  remedies  provided  for in this  Agreement  are  cumulative  and not
exclusive of any rights and remedies provided by law.




                                      -12-








         Section 7.3  Successors and Assigns.  This  Agreement  shall be binding
upon and inure to the benefit of Debtor and Secured  Party and their  respective
heirs,  successors,  and  assigns,  except that Debtor may not assign any of its
rights or obligations  under this Agreement without the prior written consent of
Secured Party.

         Section 7.4 AMENDMENT;  ENTIRE AGREEMENT.  THIS AGREEMENT  EMBODIES THE
FINAL,  ENTIRE  AGREEMENT  AMONG THE PARTIES  HERETO AND  SUPERSEDES ANY AND ALL
PRIOR COMMITMENTS,  AGREEMENTS,  REPRESENTATIONS,  AND  UNDERSTANDINGS,  WHETHER
WRITTEN  OR  ORAL,  RELATING  TO  THE  SUBJECT   MATTERHEREOF  AND  MAY  NOT  BE
CONTRADICTED OR VARIED BY EVIDENCE OF PRIOR,  CONTEMPORANEOUS OR SUBSEQUENT ORAL
AGREEMENTS OR DISCUSSIONS OF THE PARTIES  HERETO.  THERE ARE NO ORAL  AGREEMENTS
AMONG THE PARTIES  HERETO.  The  provisions of this  Agreement may be amended or
waived only by an instrument in writing signed by the parties hereto.

         Section 7.5 Notices. All notices and other communications  provided for
in this  Agreement  shall be given or made in  accordance  with the terms of the
Loan Agreement.

         Section 7.6 APPLICABLE LAW; VENUE;  SERVICE OF PROCESS.  THIS AGREEMENT
SHALL BE GOVERNED BY AND CONSTRUED IN  ACCORDANCE  WITH THE LAWS OF THE STATE OF
TEXAS AND THE  APPLICABLE  LAWS OF THE UNITED STATES OF AMERICA.  THIS AGREEMENT
HAS BEEN ENTERED INTO IN HARRIS COUNTY,  TEXAS,  AND IT SHALL BE PERFORMABLE FOR
ALL PURPOSES IN HARRIS COUNTY, TEXAS.

         Section 7.7 Headings. The headings,  captions, and arrangements used in
this Agreement are for convenience only and shall not affect the  interpretation
of this Agreement.

         Section  7.8   Survival  of   Representations   and   Warranties.   All
representations  and  warranties  made in this  Agreement or in any  certificate
delivered  pursuant  hereto  shall  survive the  execution  and delivery of this
Agreement,   and  no   investigation   by  Secured   Party   shall   affect  the
representations and warranties or the right of Secured Party to rely upon them.

         Section 7.9 Counterparts.  This Agreement may be executed in any number
of  counterparts,  each of which shall be deemed an  original,  but all of which
together shall constitute one and the same instrument.

         Section 7.10 Waiver of Bond.  In the event  Secured Party seeks to take
possession of any or all of the  Collateral by judicial  process,  Debtor hereby
irrevocably  waives any bonds and any surety or security  relating  thereto that
may be required by applicable law as an incident to such possession,  and waives
any demand for possession prior to the commencement of any such suit or action.


                                      -13-








         Section 7.11  Severability.  Any provision of this  Agreement  which is
prohibited or unenforceable in any jurisdiction  shall, as to such jurisdiction,
be ineffective to the extent of such  prohibition  or  unenforceability  without
invalidating  the  remaining   provisions  of  this  Agreement,   and  any  such
prohibition  or  unenforceability  in any  jurisdiction  shall not invalidate or
render unenforceable such provision in any other jurisdiction.

         Section 7.12  Construction.  Debtor and Secured Party  acknowledge that
each of them has had the benefit of legal counsel of its own choice and has been
afforded an opportunity to review this Agreement with its legal counsel and that
this  Agreement  shall be construed as if jointly  drafted by Debtor and Secured
Party.

         Section 7.13 Obligations Absolute. The obligations of Debtor under this
Agreement  shall be  absolute  and  unconditional  and  shall  not be  released,
discharged,  reduced,  or in any way  impaired by any  circumstance  whatsoever,
including,  without  limitation,  any  amendment,  modification,  extension,  or
renewal of this  Agreement,  the  Obligations,  or any  document  or  instrument
evidencing,  securing, or otherwise relating to the Obligations,  or any release
or subordination of collateral, or any waiver, consent,  extension,  indulgence,
compromise,  settlement,  or  other  action  or  inaction  in  respect  of  this
Agreement, the Obligations, or any document or instrument evidencing,  securing,
or otherwise relating to the Obligations, or any exercise or failure to exercise
any right, remedy, power, or privilege in respect of the Obligations.

         IN  WITNESS  WHEREOF,  the  parties  hereto  have  duly  executed  this
Agreement as of the day and year first written above.

DEBTOR:                                     SECURED PARTY:

3-D GEOPHYSICAL, INC.                       FIRST INTERSTATE BANK OF TEXAS, N.A.




By: ________________________                By: ________________________________
    J.D. White, Secretary                       Randy Wick
                                                Banking Officer


Address for Notices:                        Address for Notices:
7076 S. Alton Way                           1000 Louisiana
Englewood, Colorado  80112                  Houston, Texas  77002
Fax No.:  (303) 290-0447                    Fax No.:  (713) 250-7031
Telephone No.:  (303) 741-3700              Telephone No.:  (713) 250-7240
Attention:  President                       Attention:  Mr. Marc A. Dunmire


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