3-D GEOPHYSICAL INC
8-K, 1996-06-19
OIL & GAS FIELD EXPLORATION SERVICES
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549



                                    FORM 8-K

                                 CURRENT REPORT

     PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934




Date of Report (Date of earliest event reported)                 May 31, 1996
                                                 ----------------------------



                              3-D GEOPHYSICAL, INC.
- --------------------------------------------------------------------------------
             (Exact name of registrant as specified in its charter)


        Delaware                   33-99240                 13-3841601
- --------------------------------------------------------------------------------
(State or Other Jurisdiction    (Commission               (IRS Employer
 of Incorporation)               File Number)              Identification No.)



7076 South Alton Way, Building H,  Englewood, Colorado             80112
- --------------------------------------------------------------------------------
(Address of principal executive offices)                         (Zip Code)


Registrant's telephone number, including area code:  (303) 741-3700
                                                   -----------------------------


- --------------------------------------------------------------------------------
         (Former name or former address, if changed since last report.)



                       The Exhibit Index appears on Page 5






                                Page 1 of pages.

<PAGE>



ITEM 5.  OTHER EVENTS.

                  On May 31, 1996, the Registrant acquired from the manufacturer
thereof, Input/Output, Inc. (Input/Output"),  seismic data acquisition equipment
(the  "Equipment")  for an aggregate  of  approximately  $8,500,000  in cash and
refinanced  certain  conditional  sales  agreements  with  Input/Output  for  an
additional  $4,500,000 of equipment.  The Equipment will be used in the ordinary
course of the Registrant's business.

                  A portion  of the  purchase  price for the  Equipment  and the
funds for the refinancing were paid from the proceeds of a $15 million term loan
(the "Term  Loan")  from  First  Interstate  Bank of Texas,  N.A.  (the  "Bank")
pursuant to a Loan Agreement  between the  Registrant and the Bank,  dated as of
May 29,  1996 (the  "Loan  Agreement").  The  Registrant  plans to  utilize  the
remaining $3 million  under the Term Loan to fund future  capital  expenditures.
The Term Loan is payable,  with certain  limited  exceptions,  in equal  monthly
installments  through July 31, 1999.  The Term Loan bears  interest at an annual
rate  equal  to  the  prime  rate  plus  1%  and is  secured  by a  lien  on the
Registrant's  accounts,  accounts receivable,  equipment,  machinery,  fixtures,
inventory,  goods, chattel paper, documents,  instruments,  investment property,
general  intangibles,  and  other  personal  property,  whether  then  owned  or
thereafter acquired, and all products and proceeds thereof, and by guarantees by
each of the Registrant's subsidiaries. The Loan Agreement also provides for a $3
million  revolving credit loan (the "Revolving  Credit Loan") which may be drawn
down from  time to time  through  May 29,  1997 in an amount of up to 70% of the
Registrant's "Eligible Accounts" (as defined in the Loan Agreement). The rate of
interest and the security  for the  Revolving  Credit Loan are the same as those
described above for the Term Loan. In addition to certain customary  affirmative
covenants,  the Loan Agreement  contains  restrictions  on the  Registrant  with
respect to (i)  incurring  Debt (as  defined),  incurring or permitting to exist
Liens (as defined) on its property assets or revenues, (iii) declaring or paying
any dividends or other  distributions  on its capital stock (or acquiring any of
its capital stock),  (iv) issuing capital stock, (v) entering into  transactions
with  affiliates,  (vi)  disposing of assets,  and (vii) with respect to certain
other matters, and contains certain financial  covenants.  The foregoing summary
of the Loan  Agreement  is  qualified  in its  entirety by reference to the Loan
Agreement and other agreements relating thereto, copies of which are attached as
exhibits to this Current Report on Form 8-K.




                                Page 2 of pages.

<PAGE>





ITEM 7.  FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS.

                  (c)      Exhibits.

                  10.1     Loan Agreement between 3-D Geophysical, Inc. and
                           First Interstate Bank of Texas, N.A., dated as of May
                           29, 1996.

                  10.2     Security Agreement between 3-D Geophysical, Inc.
                           and First Interstate Bank of Texas, N.A., dated as of
                           May 29, 1996.

                  10.3     Security  Agreement  between Northern  Geophysical of
                           America,  Inc.  and First  Interstate  Bank of Texas,
                           N.A., dated as of May 29, 1996.

                  10.4     Security Agreement between Paragon Geophysical,  Inc.
                           and First Interstate Bank of Texas, N.A., dated as of
                           May 29, 1996.

                  10.5     Security Agreement between Geoevaluaciones S.A. de
                           C.V. and First Interstate Bank of Texas, N.A., dated
                           as of May 29, 1996.

                  10.6     Guaranty   Agreement  by  Northern   Geophysical   of
                           America,  Inc. in favor of First  Interstate  Bank of
                           Texas, N.A., dated as of May 29, 1996.

                  10.7     Guaranty Agreement by Paragon Geophysical ,Inc. in
                           favor of First Interstate Bank of Texas, N.A., dated
                           as of May 29, 1996.

                  10.8     Guaranty Agreement by Geoevaluaciones S.A. de C.V. in
                           favor of First Interstate Bank of Texas, N.A., dated
                           as of May 29, 1996.







                                Page 3 of pages.

<PAGE>




                                   SIGNATURES


                  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES EXCHANGE ACT OF
1934,  THE  REGISTRANT HAS DULY CAUSED THIS REPORT TO BE SIGNED ON ITS BEHALF BY
THE UNDERSIGNED THEREUNTO DULY AUTHORIZED.


                                        3-D GEOPHYSICAL, INC.

                                        BY:/S/ JOHN D. WHITE, JR.
                                           Name:  John D. White, Jr.
                                           Title: Executive Vice President



Date:  June ___, 1996
            





                                Page 4 of pages.

<PAGE>


                                  EXHIBIT INDEX

Exhibit                                                          Page


10.1     Loan Agreement  between 3-D  Geophysical,  Inc. and
         First  Interstate Bank of Texas,  N.A., dated as of
         May 29, 1996.

10.2     Security  Agreement  between 3-D Geophysical,  Inc.
         and First Interstate Bank of Texas,  N.A., dated as
         of May 29, 1996.

10.3     Security Agreement between Northern  Geophysical of
         America,  Inc. and First  Interstate Bank of Texas,
         N.A., dated as of May 29, 1996.

10.4     Security  Agreement  between  Paragon  Geophysical,
         Inc.  and First  Interstate  Bank of  Texas,  N.A.,
         dated as of May 29, 1996.

10.5     Security Agreement between  Geoevaluaciones S.A. de
         C.V.  and First  Interstate  Bank of  Texas,  N.A.,
         dated as of May 29, 1996.

10.6     Guaranty  Agreement  by  Northern   Geophysical  of
         America,Inc.  in favor of First  Interstate Bank of
         Texas, N.A., dated as of May 29, 1996.

10.7     Guaranty Agreement by Paragon  Geophysical ,Inc. in
         favor  of First  Interstate  Bank of  Texas,  N.A.,
         dated as of May 29, 1996.

10.8     Guaranty Agreement by Geoevaluaciones  S.A. de C.V.
         in favor of First  Interstate Bank of Texas,  N.A.,
         dated as of May 29, 1996.



                      Page 5 of pages.


     **********************************************************************














                                 LOAN AGREEMENT

                                     between

                              3-D GEOPHYSICAL, INC.

                                       and

                      FIRST INTERSTATE BANK OF TEXAS, N.A.


                            Dated as of May 29, 1996














      *********************************************************************


<PAGE>



                                 LOAN AGREEMENT


         THIS  LOAN  AGREEMENT,  dated  as of  May  29,  1996,  is  between  3-D
GEOPHYSICAL,  INC., a Delaware  corporation  (together  with its  successors and
permitted assigns, the "Borrower"),  and FIRST INTERSTATE BANK OF TEXAS, N.A., a
national  banking  association  (together  with  its  successors  and  permitted
assigns, the "Lender").

                                R E C I T A L S:

         A. The  Borrower  has  requested  the  Lender to  extend  credit to the
Borrower in the form of (i) a revolving credit facility not to exceed $3,000,000
(the  "Revolving  Credit Loan")  outstanding at any time and (ii) a term loan in
the principal amount of $15,000,000 (the "Term Loan").

         B. The  proceeds  of the  Revolving  Credit  Loan will be  utilized  to
finance  Borrower's  working  capital.  The  proceeds  of the Term  Loan will be
utilized to (i) finance a portion of the cost of purchasing Equipment consisting
of a new seismic data acquisition  system,  (ii) refinance certain of Borrower's
existing  debt and (iii)  finance up to 85% of the purchase  price of additional
purchases of new Equipment.

         C. The  Lender  is  willing  to make such  extensions  of credit to the
Borrower upon the terms and conditions hereinafter set forth.

          NOW  THEREFORE,  in  consideration  of the  premises  and  the  mutual
covenants herein contained, the parties hereto agree as follows:

                                    ARTICLE I

                                   Definitions

         Section 1.1 Definitions.  All capitalized  terms used in this Agreement
shall have the meanings set forth on Appendix A attached hereto and incorporated
herein for all purposes.

         Section 1.2 Other Definitional Provisions. All definitions contained in
Appendix A are equally  applicable to the singular and plural forms of the terms
defined.  The words  "hereof',  "herein",  and  "hereunder" and words of similar
import referring to this Agreement refer to this Agreement as a whole and not to
any particular  provision of this Agreement.  Unless  otherwise  specified,  all
Article and Section references  pertain to this Agreement.  All accounting terms
not  specifically  defined  herein shall be construed in  accordance  with GAAP.
Terms used herein that are defined in the UCC, unless otherwise  defined herein,
shall have the meanings specified in the UCC





<PAGE>



                                   ARTICLE II

                              Revolving Credit Loan

         Section  2.1  Revolving  Credit  Commitment.  Subject  to the terms and
conditions of this  Agreement,  the Lender agrees to make one or more  Revolving
Credit  Advances to the  Borrower  from time to time from the date hereof to and
including the Revolving  Credit  Termination  Date,  provided that the aggregate
amount of all Revolving Credit Advances at any time outstanding shall not exceed
the lesser of (a) the Borrowing  Base or (b) the amount of the Revolving  Credit
Commitment.  Subject  to the  foregoing  limitations,  and the  other  terms and
provisions  of this  Agreement,  the  Borrower may borrow,  repay,  and reborrow
hereunder.

         Section 2.2 Revolving  Credit Note.  The  obligation of the Borrower to
repay Revolving  Credit Advances shall be evidenced by the Revolving Credit Note
executed by the Borrower,  payable to the order of the Lender,  in the principal
amount of the Commitment as originally in effect, and dated the date hereof.

         Section 2.3  Repayment of Revolving  Credit  Loan.  The Borrower  shall
repay the outstanding principal amount of the Revolving Credit Commitment (i.e.,
all Revolving Credit Advances) on the Revolving Credit Termination Date.

         Section 2.4 Interest.  Revolving  Credit  Advances  shall bear interest
prior to  maturity  at a  varying  rate per annum  equal  from day to day to the
lesser of (a) the Maximum Rate, or (b) the sum of the Applicable  Rate in effect
from day to day.  If at any time the rate of  interest  specified  in clause (b)
above shall exceed the Maximum Rate,  thereby  causing the interest  accruing on
Revolving Credit Advances to be limited to the Maximum Rate, then any subsequent
reduction  in the Base Rate shall not reduce the rate of interest  on  Revolving
Credit  Advances  below the Maximum Rate until the aggregate  amount of interest
accrued on Revolving  Credit Advances equals the aggregate  amount of ' interest
which  would have  accrued on the  Revolving  Credit Loan if the  interest  rate
specified  in clause  (b) above had at all times  been in  effect,  Accrued  and
unpaid  interest on the  Revolving  Credit Loan shall be due and payable on each
Monthly Payment Date and on the Revolving Credit Termination Date.

         Section 2.5 Borrowing Procedure.  The Borrower shall give the Lender at
least three  Business Days prior notice of each  Revolving  Credit Advance under
the Revolving  Credit Loan by means of a Revolving  Credit Advance  Request Form
containing the information  required therein.  The Lender at its option may from
time to time accept telephonic requests for Revolving Credit Advances,  provided
that such  acceptance  shall not  constitute a waiver of the  Lender's  right to
require  delivery of a Revolving  Credit Advance Request Form in connection with
subsequent Advances. Any telephonic request for a Revolving Credit Advance shall
be promptly  confirmed by submission of a properly  completed  Revolving  Credit
Advance Request Form to the Lender.  Subject to the terms and conditions of this
Agreement,  each Revolving  Credit Advance under the Revolving Credit Loan shall
be made available to the Borrower by

                                       -3-



<PAGE>



depositing  the same,  in  immediately  available  funds,  in an  account of the
Borrower  maintained with the Lender at the Principal  Office  designated by the
Borrower.

         Section  2.6 Use of  Proceeds.  The  proceeds of the  Revolving  Credit
Advances  shall be used by the  Borrower  for  working  capital in the  ordinary
course of business.

         Section 2.7 Borrowing Base; Mandatory  Prepayments.  If at any time the
outstanding  principal amount of the Revolving Credit Loan exceeds the Borrowing
Base,  the  Borrower  shall  promptly,  and in any  event,  within  five days of
learning of the same,  prepay the  Revolving  Credit Loan by an amount  equal to
such excess plus accrued and unpaid interest on the amount so prepaid.

         Section 2.8 Revolving Credit Commitment Fee. (a) The Borrower agrees to
pay to the Lender a commitment  fee on the date of the first  Advance under this
Agreement in the amount of $15,000. (b) In addition,  the Borrower agrees to pay
to the Lender,  from time to time, a commitment  fee on the daily average unused
amount of the Revolving Credit  Commitment for the period from and including the
date the  requirement set forth in Section 6.2(a) of this Agreement is satisfied
to and including the Revolving Credit Termination Date, at the rate of 0.50% per
annum  based on a 365 day year and the actual  number of days  elapsed.  Accrued
commitment fee shall be payable in arrears on each Quarterly Payment Date and on
the Revolving Credit Termination Date.

         Section 2.9 Reduction or  Termination of Revolving  Credit  Commitment.
The  Borrower  shall have the right to  terminate in whole or reduce in part the
unused portion of the Revolving  Credit  Commitment upon at least three Business
Days' prior notice (which notice shall be irrevocable) to the Lender  specifying
the effective  date thereof,  whether a termination  or reduction is being made,
and the amount of any partial  reduction,  provided that each partial  reduction
shall be in the amount of  $100,000  or an  integral  multiple  thereof  and the
Borrower shall  simultaneously  prepay the amount by which the unpaid  principal
amount of the Revolving Credit Advances exceeds the Revolving Credit  Commitment
(after  giving  effect to such notice)  plus accrued and unpaid  interest on the
principal  amount  so  prepaid.  The  Revolving  Credit  Commitment  may  not be
reinstated after it has been terminated or reduced.

                                   ARTICLE III

                                    Term Loan

         Section 3.1 Term Loan  Commitment.  Subject to the terms and conditions
of this Agreement,  the Lender agrees to make the Term Loan to the Borrower in a
principal  amount up to but not exceeding the amount of the Term Loan Commitment
in (i) an initial Term Loan Advance in the amount of at least $12,051,311.20 and
(ii) an  additional  Term  Loan  Advance  in an amount  not to  exceed  the then
remaining  undrawn Term Loan  Commitment on or before the Tenn Loan  Termination
Date.


                                       -4-



<PAGE>



         Section 3.2 The Term Note.  The obligation of the Borrower to repay the
Term Loan and  accrued  interest  thereon  shall be  evidenced  by the Term Note
executed by the Borrower,  payable to the order of the Lender,  in the principal
amount of the Term Loan Commitment, and dated the date hereof.

         Section 3.3 Repayment of Term Loan. The Borrower shall repay the unpaid
principal  amount of, and all accrued but unpaid  interest  on, the Term Loan in
accordance with the Term Note.

         Section  3.4  Interest.  The unpaid  principal  amount of the Term Loan
shall bear  interest  prior to maturity  or Default at a varying  rate per annum
equal  from  day to day to the  lesser  of (a)  the  Maximum  Rate,  or (b)  the
Applicable  Rate in effect  from day to day. If at any time the rate of interest
specified in clause (b) above shall exceed the Maximum Rate, thereby causing the
interest  accruing on the Term Loan to be limited to the Maximum Rate,  then any
subsequent  reduction  in the  Applicable  Rate  shall  not  reduce  the rate of
interest on the Term Loan below the Maximum Rate until the  aggregate  amount of
interest  accrued on the Term Loan equals the aggregate amount of interest which
would have accrued on the Term Loan if the interest rate specified in clause (b)
above had at all times been in effect.

         Section 3.5  Borrowing  Procedure,  Etc.  The  Borrower  shall give the
Lender at least three  Business Days prior notice of the Term Loan Advance under
the Term  Loan by means of a Term  Loan  Advance  Request  Form  containing  the
information  required  therein.  Subject  to the  terms and  conditions  of this
Agreement, each Term Loan Advance under the Term Loan shall be made available to
the Borrower by  depositing  the same, in  immediately  available  funds,  in an
account  of the  Borrower  maintained  with the Lender at the  Principal  Office
designated  by the  Borrower.  The second Term Loan  Advance  shall not be in an
amount greater than 85% of the purchase  price of Equipment  being acquired with
the proceeds thereof.

         Section 3.6  Facility  Fee. In  consideration  for making the Term Loan
available  to Borrower,  Borrower  shall pay to Lender as a facility fee $75,000
upon the execution of this Agreement.

         Section  3.7 Use of  Proceeds.  The  proceeds of the Term Loan shall be
used by the  Borrower  to (i)  finance  a  portion  of the  cost  of  purchasing
Equipment  consisting of a new seismic data acquisition  system,  (ii) refinance
certain of Borrower's  existing debt identified to Lender,  and (iii) finance up
to 85% of the purchase price of additional purchases of new Equipment.

         Section  3.8  Mandatory  Prepayment.  On each  Quarterly  Payment  Date
(beginning  November 30,  1996),  the Borrower  shall prepay the Term Loan in an
amount equal to 50 percent of the Excess Cash Flow for the immediately preceding
calendar quarter: All mandatory  prepayments shall be applied to the outstanding
principal of the Term Loan in inverse order of maturity.


                                       -5-



<PAGE>



         Section 3.9 Voluntary Prepayment and Repayment. The Borrower may, on at
least two  Business  Days prior  notice to the  Lender,  prepay the Term Loan in
whole at any time or from time to time in part  without  premium or penalty  but
with  accrued  interest  to the date of  prepayment  on the  amount so  prepaid,
provided  that each  partial  prepayment  under  the Term  Note  shall be in the
principal  amount of at least  $100,000.  With  respect  to the Term  Note,  all
prepayments  shall be applied to the  outstanding  principal of the Term Loan in
inverse order of maturity.

                                   ARTICLE IV

                                    Payments

         Section 4.1 Method of Payment. All payments of principal, interest, and
other amounts to be made by the Borrower under this Agreement and the other Loan
Documents  shall be made to the Lender at the  Principal  Office in Dollars  and
immediately  available funds, without setoff,  deduction,  or counterclaim,  not
later than 11:00  A.M.,  Houston,  Texas time on the date on which such  payment
shall  become due (each such payment made after such time on such due date to be
deemed to have been made on the next  succeeding  Business Day).  Subject to the
provisions of the Lockbox  Agreement,  the Borrower shall, at the time of making
each such payment,  specify to the Lender the sums payable by the Borrower under
this  Agreement  and the other Loan  Documents  to which  such  payment is to be
applied  (and in the event the Borrower  fails to so specify,  or if an Event of
Default has occurred and is  continuing,  but subject to the Lockbox  Agreement,
the Lender may apply such payment to the Obligations in such order and manner as
it may elect in its sole discretion).  Whenever any payment under this Agreement
or any  other  Loan  Document  shall be  stated to be due on a day that is not a
Business Day, such payment  shall be made on the next  succeeding  Business Day,
and such extension of time shall in such case be included in the  computation of
the payment of interest and commitment fee, as the case may be.

         Section 4.2 Computation of Interest. Interest on all amounts payable by
the Borrower  hereunder shall be computed on the basis of a year of 365 days and
the actual  number of days elapsed  (including  the first day but  excluding the
last day) unless such calculation would result in a usurious rate, in which case
interest  shall be  calculated on the basis of a year of 365 or 366 days, as the
case may be.

         Section 4.3 Interest at Default  Rate.  Notwithstanding  any  provision
herein,  Advances and (to the fullest extent  permitted by law) any other amount
payable by the Borrower under this Agreement or any other Loan Document that are
not paid in full when due  (whether  at stated  maturity,  by  acceleration,  or
otherwise)  shall bear  interest  at the  Default  Rate for the period  from and
including  the due date  thereof to but  excluding  the date the same is paid in
full. Interest payable at the Default Rate shall be payable from time to time on
demand.

         Section  4.4 Capital  Adequacy.  If after the date  hereof,  the Lender
shall have determined that the adoption or implementation of any applicable law,
rule, or regulation

                                       -6-



<PAGE>



regarding  capital  adequacy,  or  any  change  therein,  or any  change  in the
interpretation  or   administration   thereof  by  any  central  bank  or  other
Governmental   Authority  charged  with  the  interpretation  or  administration
thereof,  or  compliance  by the  Lender  (or its  parent)  with any  guideline,
request,  or directive  regarding  capital  adequacy  (whether or not having the
force  of  law)  of any  such  central  bank  or  other  Governmental  Authority
applicable  generally to Banks of Lender's (or its parent's)  size, has or would
have the effect of reducing the rate of return on the Lender's (or its parent's)
capital  as a  consequence  of its  obligations  hereunder  or the  transactions
contemplated hereby to a level below that which the Lender (or its parent) could
have  achieved but for such  adoption,  implementation,  change,  or  compliance
(taking  into  consideration  the  Lender's  policies  with  respect  to capital
adequacy) by an amount  deemed by the Lender to be  material,  then from time to
time, within 10 Business Days after demand by the Lender, the Borrower shall pay
to the  Lender  (or its  parent)  such  additional  amount  or  amounts  as will
compensate the Lender for such  reduction.  A certificate of the Lender claiming
compensation  under this  Section and  setting  forth the  additional  amount or
amounts  to be paid to it  hereunder  shall  be  conclusive,  provided  that the
determination  thereof is made on a reasonable basis. In determining such amount
or amounts, the Lender may use any reasonable averaging and attribution methods.

         Section 4.5 Annual Agent Fee.  Beginning on May 31, 1997,  the Borrower
shall pay to the Lender on May 31 of each year during the term of this Agreement
an annual  agent's  fee of $15,000 to  compensate  the Lender for its efforts in
managing participations in Loans, disseminating information, and providing other
services related thereto.

                                    ARTICLE V

                                    Security

         Section  5.1  Collateral.  To  secure  full and  complete  payment  and
performance  of the  Obligations,  the Borrower  shall execute and deliver,  and
shall cause each  Subsidiary  to execute and deliver,  a Security  Agreement and
other documents  described below covering the property and collateral  described
in this Section  (which,  together with any other property and collateral  which
may now or hereafter  secure the  Obligations or any part thereof,  is sometimes
herein called the "Collateral"):

                  All  of  its   accounts,   accounts   receivable,   equipment,
         machinery,   fixtures,  inventory,  goods,  chattel  paper,  documents,
         instruments,   investment  property,  general  intangibles,  and  other
         personal  property,  whether now owned or hereafter  acquired,  and all
         products and proceeds thereof.

The Borrower  shall execute and cause to be executed such further  documents and
instruments,  including,  without limitation,  Uniform Commercial Code financing
statements, as the Lender, in its sole discretion,  deems necessary or desirable
to create,  evidence,  preserve, and perfect its liens and security interests in
the Collateral.


                                       -7-



<PAGE>



         Section 5.2  Guaranties.  Each Guarantor  shall  guarantee  Obligations
pursuant to a Guaranty.

         Section  5.3  Additional   Support.   Manufacturer  shall  provide  the
Remarketing and Support Agreement.

         Section 5.4 Setoff.  If an Event of Default  shall have occurred and be
continuing,  the Lender  shall have the right to set off and apply  against  the
Obligations in such manner as the Lender may determine,  at any time and without
notice to the  Borrower  or any  Subsidiary,  any and all  deposits  (general or
special,  time or  demand,  provisional  or  final)  or  other  sums at any time
credited by or owing from the Lender to the Borrower or any  Subsidiary  whether
or not the  Obligations are then due. As further  security for the  Obligations,
the  Borrower  hereby  grants to the  Lender a security  interest  in all money,
instruments,  and other  property of the Borrower  now or hereafter  held by the
Lender, including, without limitation, property held in safekeeping. In addition
to the Lender's right of setoff and as further security for the Obligations, the
Borrower  hereby  grants  to the  Lender a  security  interest  in all  deposits
(general or special, time or demand, provisional or final) and other accounts of
the  Borrower  now or  hereafter  on deposit  with or held by the Lender and all
other sums at any time credited by or owing from the Lender to the Borrower. The
rights and remedies of the Lender  hereunder are in addition to other rights and
remedies  (including,  without  limitation,  other  rights of setoff)  which the
Lender may have.

                                   ARTICLE VI

                              Conditions Precedent

         Section 6.1 Initial Term Loan Advance.  The obligation of the Lender to
make an initial Term Loan Advance is subject to the condition precedent that the
Lender  shall  have  received  on or before the day of such  Advance  all of the
following,  each dated (unless otherwise indicated) the date hereof, in form and
substance satisfactory to the Lender:

                  (a) Resolutions. Resolutions of the Board of Directors of each
         of the Borrower, the Manufacturer,  and the Guarantors certified by its
         Secretary or an Assistant  Secretary  which  authorize  the  execution,
         delivery, and performance of the Loan Documents to which it is or is to
         be a party (each of Manufacturer's and each Guarantor's  certificate to
         be dated the date of the initial Advance) or equivalent documents under
         the laws of the Republic of Mexico);

                  (b)  Incumbency  Certificate.  A certificate  of incumbency of
         each of the Borrower, the Manufacturer, and the Guarantors certified by
         the Secretary or an Assistant  Secretary of such Person  certifying the
         names of the  officers  of such Person  authorized  to sign each of the
         Loan  Documents  to  which  it is or is to be a  party  (including  the
         certificates  contemplated herein) together with specimen signatures of
         such   officers   (each  of   Manufacturer's   and   each   Guarantor's
         certification to be dated the date

                                       -8-



<PAGE>



         of the initial  Advance) or equivalent  documents under the laws of the
         Republic of Mexico);

                  (c) Articles of  Incorporation.  The articles of incorporation
         of each of the Borrower,  Manufacturer, and each Guarantor certified by
         the appropriate public official of the jurisdiction of incorporation of
         such  Person and dated  within 10 days prior to the date of the initial
         Advance  or  equivalent  documents  under the laws of the  Republic  of
         Mexico;

                  (d) Bylaws. The bylaws of each of the Borrower,  Manufacturer,
         and each Guarantor certified by the Secretary or an Assistant Secretary
         of  such  Person   (each  of   Manufacturer's   and  each   Guarantor's
         certification to be dated the date of the initial Advance or equivalent
         documents under the laws of the Republic of Mexico);

                  (e) Governmental Certificates. Certificates of the appropriate
         government  officials of each of the  Borrower's,  Manufacturer's,  and
         each Guarantor's  jurisdiction of incorporation as to the existence and
         good  standing of such  Person,  each dated within 10 days prior to the
         date of the initial  Advance or equivalent  documents under the laws of
         the Republic of Mexico;

                  (f) Term Note. The Term Note executed by the Borrower;

                  (g) Security Agreements.  A Security Agreement executed by the
         Borrower and each Guarantor;

                  (h)  Financing   Statements;   Etc.  Uniform  Commercial  Code
         financing  statements and all other appropriate  documents necessary or
         advisable  (including,  as applicable,  equivalent  documents under the
         laws of the  Republic  of Mexico) to perfect the  Lender's  Lien on the
         Collateral  executed by the  Borrower and each  Guarantor  and covering
         such Collateral as the Lender may request;

                  (i) Guaranty. A Guaranty executed by each of the Guarantors;

                  (j)   Remarketing   and  Support   Agreement.   Manufacturer's
         Remarketing and Support Agreement executed by the Manufacturer;

                  (k)   Representations   and   Warranties   Certificate.    The
         Representations  and  Warranties   Certificates  each  executed  by  an
         authorized  officer  of  the  Borrower,  the  Manufacturer,   and  each
         Guarantor and the other Persons party thereto;

                  (l) Lockbox  Agreement.  The Lockbox Agreement executed by the
         Borrower, the Manufacturer and the Guarantors;


                                       -9-



<PAGE>



                  (m)  Insurance  Policies.  Binders of all  insurance  policies
         required by Section  7.5,  naming  Lender as loss payee with respect to
         all insurance policies covering Collateral and providing such insurance
         will not be cancelled  without 30 days' prior written notice to Lender,
         and as soon as available,  copies of such policies,  together with loss
         payable  endorsements  in favor of the Lender with respect to insurance
         covering  Collateral  and naming Lender as an  additional  insured with
         respect to comprehensive general liability insurance,  and endorsements
         providing for no cancellation  without 30 days' prior written notice to
         Lender;

                  (n) UCC Search,  Etc. The results of a Uniform Commercial Code
         search and other appropriate  searches showing all financing statements
         and other documents or instruments on file against the Borrower and its
         Subsidiaries  in the offices of the  Secretary  of State of Texas,  the
         Secretary of State of Colorado and other  jurisdictions in which any of
         them do business, such searches to be as of a date no more than 10 days
         prior to the date of the initial Advance;

                  (o)  Opinion of  Counsel.  Favorable  opinion  of  Rothgerber,
         Appel, Powers & Johnson LLP and Webb & Lautherbach, P.C., legal counsel
         to the Borrower and its Subsidiaries,  as to such matters as the Lender
         or its counsel may reasonably request;

                  (p) Opinion of Counsel of Manufacturer. A favorable opinion of
         Haynes & Boone, L.L.P.,  legal counsel to the Manufacturer,  as to such
         matters as the Lender may reasonably request;

                  (q)  Facility  Fee.  Evidence  that the  Borrower has paid the
         facility fee payable to Lender under Section 3.5;

                  (r) Accounts.  Evidence  that the Lockbox  Account and related
         reserve accounts have been established;

                  (s)  Participants.  Receipt of  participation  agreements from
         financial institutions acceptable to the Lender in respect of 27.78% of
         the Revolving Credit Commitment and the 27.78% Term Loan Commitment;

                  (t) Review of Certain  Contracts.  Review and  approval by the
         Lender  of  the  Borrower's  or a  Guarantor's  contract  with  British
         Petroleum  relating  to seismic  surveys to be  performed  on the North
         Slope of Alaska;

                  (u) Attorneys' Fees and Expenses.  Evidence that the costs and
         expenses (including  reasonable attorneys' fees) referred to in Section
         11.1, to the extent incurred, shall have been paid in full;


                                      -10-



<PAGE>



                  (v) Vessel Charters and Leases.  As soon as available,  a copy
         of each  charter  relating  to a Vessel on which all or any part of the
         Collateral is or will be located and each lease of real Property  where
         Collateral is stored;

                  (w)  Waivers.  Receipt of  landlord's,  charterer's  and other
         similar waivers of any Lien on the  Collateral,  the form and substance
         to be satisfactory to the Lender.

                  (x) All  Advances.  The  obligation  of the Lender to make any
         Advance  (including  the initial  Advance) is subject to the  following
         additional conditions precedent:

                  (y) Advance  Request Form. The Lender shall have received,  in
         accordance with Section 3.6, an Advance Request Form, dated the date of
         such Advance, executed by an authorized officer of the Borrower;

                  (z)  No  Default.  No  Default  shall  have  occurred  and  be
         continuing, or would exist after giving effect to such Advance;

                  (aa)  Additional  Documentation.  Such  additional  approvals,
         opinions,  or  documents as the Lender or its legal  counsel,  Winstead
         Sechrest & Minick P.C., may reasonably request.

         Section 6.2 Initial  Revolving  Credit  Advance.  The obligation of the
Lender to make an initial  Revolving  Credit Advance is subject to the condition
precedent  that the  Lender  shall  have  received  on or before the day of such
Advance all of the following,  each dated (unless otherwise  indicated) the date
hereof, in form and substance satisfactory to the Lender:

                  (a) Revolving  Credit Note. The Revolving Credit Note executed
         by the Borrower;

                  (b) Collateral Audit. Evidence satisfactory to the Lender that
         its commercial  finance department has completed a Collateral audit and
         issued a satisfactory rating;

                  (c) Other Requirements. All of the requirements for an Initial
         Term Loan Advance have been  satisfied  (including any not satisfied on
         the date of the Initial Term Advance);

                  (d)  Commitment  Fee.  Evidence that the Borrower has paid the
         initial commitment fee payable to Lender under Section 2.8(b);

                  (e) Advance  Request Form. The Lender shall have received,  in
         accordance with Section 2.5, an Advance Request Form, dated the date of
         such Advance, executed by an authorized officer of the Borrower;


                                      -11-



<PAGE>



                  (f)  No  Default.  No  Default  shall  have  occurred  and  be
         continuing, or would exist after giving effect to such Advance.

                  (g) Representations and Warranties. All of the representations
         and  warranties   contained  in  the   Representation   and  Warranties
         Certificate  and the other Loan Documents  shall be true and correct on
         and as of the date of such Advance with the same force and effect as if
         such  representations  and  warranties  had been made on and as of such
         date.

                  (h) Additional Documentation. The Borrower shall have provided
         such additional approvals,  opinions, or documents as the Lender or its
         legal  counsel,  Winstead  Sechrest  &  Minick,  P.C.,  may  reasonably
         request.

         Section 6.3 Conditions to All Advances. The obligation of the Lender to
make each Advance  hereunder is subject to the  additional  condition  precedent
that:

                  (a)  No  Default.  No  Default  shall  have  occurred  and  be
         continuing, or would exist after giving effect to such Advance.

                  (b) Advance  Request Form. The Lender shall have received,  in
         accordance  with  Section  2.5 or 3.6,  as the case may be, an  Advance
         Request Form, dated the date of such Advance, executed by an authorized
         officer of the Borrower;

                  (c) Representations and Warranties. All of the representations
         and  warranties   contained  in  the   Representation   and  Warranties
         Certificate  and the other Loan Documents  shall be true and correct on
         and as of the date of such Advance with the same force and effect as if
         such  representations  and  warranties  had been made on and as of such
         date.

                  (d) Additional Documentation. The Borrower shall have provided
         such additional approvals,  opinions, or documents as the Lender or its
         legal counsel, Winstead Sechrest & Minick P.C., may reasonably request.

                                   ARTICLE VII

                               Positive Covenants

         The Borrower  covenants and agrees that, as long as the  Obligations or
any part thereof are outstanding or the Lender has any Commitment hereunder, the
Borrower will perform and observe the following positive  covenants,  unless the
Lender shall otherwise consent in writing:

         Section 7.1  Reporting  Requirements.  The Borrower will furnish to the
Lender and to the Manufacturer:

                  (a) Annual Financial Statements.  As soon as available, and in
         any event  within  120 days  after the end of each  fiscal  year of the
         Borrower, beginning with the

                                      -12-



<PAGE>



         fiscal year ending  December 31,  1996,  (i) a copy of the annual audit
         report  of the  Borrower  and the  Subsidiaries  for such  fiscal  year
         containing,  on a consolidated and consolidating  basis, balance sheets
         and statements of income,  retained  earnings,  and cash flow as at the
         end of such fiscal year and for the 12-month period then ended, in each
         case setting  forth in  comparative  form the figures for the preceding
         fiscal  year,  all in  reasonable  detail and audited and  certified by
         independent   certified  public  accountants  of  recognized   standing
         acceptable  to the  Lender,  to the  effect  that such  report has been
         prepared  in  accordance  with  GAAP;  and (ii) a  certificate  of such
         independent  certified public accountants to Lender (A) stating that to
         their  knowledge no Default has occurred  and is  continuing,  or if in
         their opinion a Default has occurred and is continuing,  a statement as
         to the nature thereof, and (B) confirming the calculations set forth in
         the officer's certificate delivered simultaneously therewith;

                  (b) Annual Report on Form 10-K.  As soon as available,  and in
         any event within 120 days after filing deadline therefor, a copy of the
         annual  report of the  Borrower on Form 10-K filed with the  Securities
         and Exchange Commission or any successor agency, certified by the chief
         financial officer of Borrower to be a true and correct copy thereof;

                  (c) Monthly Financial Statements. As soon as available, and in
         any event within 45 days after the end of each  calendar  month of each
         fiscal year of the Borrower, a copy of an unaudited financial report of
         the  Borrower  as of the end of such  month and for the  portion of the
         fiscal year then ended, containing, on a consolidated and consolidating
         basis, balance sheets and statements of income,  retained earnings, and
         cash  flow,  in each  case  after  March  31,  1997  setting  forth  in
         comparative  form  the  figures  for the  corresponding  period  of the
         preceding fiscal year, all in reasonable  detail certified by the chief
         financial  officer of the Borrower to have been  prepared in accordance
         with GAAP and to fairly and  accurately  present  (subject  to year-end
         audit adjustments) the financial condition and results of operations of
         the Borrower,  on a consolidated and  consolidating  basis, at the date
         and for the periods indicated therein;  provided,  however,  that until
         the  Borrower is required to provide  monthly in  comparative  form the
         figures  set forth  above,  the  Borrower  shall  provide the same on a
         quarterly basis (due 45 days after the end of each such quarter);

                  (d) Accounts  Receivable  and Accounts  Payable Aging Reports.
         Concurrently with the delivery of the financial  statements referred to
         in subsection 7.1(c), an accounts receivable and accounts payable aging
         report and a backlog listing;

                  (e) Certificate of No Default.  Concurrently with the delivery
         of each of the financial  statements  referred to in subsections 7.1(a)
         and 7.1(c),  a certificate of the chief executive or other  responsible
         officer of the Borrower (i) stating that to the best of such  officer's
         knowledge,  no Default has occurred and is continuing,  or if a Default
         has occurred and is  continuing,  a statement as to the nature  thereof
         and the action which is

                                      -13-



<PAGE>



         proposed  to be  taken  with  respect  thereto,  and  (ii)  showing  in
         reasonable  detail  the  calculations   demonstrating  compliance  with
         Article IX;

                  (f) Annual Collateral Listing.  Concurrently with the delivery
         of the financial statements referred to in subsection 7.1(a), a listing
         of all of the  Borrower's  inventory and equipment  Collateral  and its
         location;

                  (g) Management Letters.  Promptly upon receipt thereof, a copy
         of any management letter or written report submitted to the Borrower or
         any Subsidiary by independent certified public accountants with respect
         to  the  business,  condition  (financial  or  otherwise),  operations,
         prospects, or properties of the Borrower or any Subsidiary;

                  (h)  Notice of  Litigation.  Promptly  after the  commencement
         thereof,  notice of all  actions,  suits,  and  proceedings  before any
         Governmental  Authority  or  arbitrator  affecting  the Borrower or any
         Subsidiary  which,  if  determined  adversely  to the  Borrower or such
         Subsidiary, could have a Material Adverse Effect;

                  (i) Notice of Default.  As soon as  possible  and in any event
         within five days after the occurrence of each Default, a written notice
         setting  forth the  details of such  Default  and the  action  that the
         Borrower has taken and proposes to take with respect thereto;

                  (j)  ERISA  Reports.  Promptly  after the  filing  or  receipt
         thereof,  copies of all reports,  including annual reports, and notices
         which the Borrower or any  Subsidiary  files with or receives  from the
         PBGC or the  U.S.  Department  of  Labor  under  ERISA;  and as soon as
         possible  and in any event  within five days after the  Borrower or any
         Subsidiary  knows or has  reason to know that any  Reportable  Event or
         Prohibited  Transaction  has occurred  with respect to any Plan or that
         the PBGC or the  Borrower  or any  Subsidiary  has  instituted  or will
         institute  proceedings under Title IV of ERISA to terminate any Plan, a
         certificate  of the chief  financial  officer of the  Borrower  setting
         forth the details as to such Reportable Event or Prohibited Transaction
         or Plan  termination and the action that the Borrower  proposes to take
         with respect thereto;

                  (k) Notice of Material Adverse Change. As soon as possible and
         in any event  within ten days  after the  occurrence  thereof,  written
         notice of any matter  that could  reasonably  cause a Material  Adverse
         Effect on the Borrower or any Subsidiary;

                  (l) Borrowing  Base.  As soon as  available,  and in any event
         within 15 days after the end of each calendar  month,  a Borrowing Base
         Report, certified by the chief financial officer of the Borrower;

                  (m) Proxy Statements,  Etc. As soon as available,  one copy of
         each financial statement,  report notice or proxy statement sent by the
         Borrower or any Subsidiary to its  stockholders  generally and one copy
         of each regular, periodic or special report,

                                      -14-



<PAGE>



         registration  statement,  or  prospectus  filed by the  Borrower or any
         Subsidiary with any securities  exchange or the Securities and Exchange
         Commission or any successor agency; and

                  (n)  General  Information.  Promptly,  such other  information
         concerning  the Borrower or any  Subsidiary as the Lender may from time
         to time reasonably request.

         Section 7.2 Maintenance of Existence; Conduct of Business. The Borrower
will  preserve  and  maintain,  and will cause each  Subsidiary  to preserve and
maintain,  its corporate existence;  in addition, the Borrower will preserve and
maintain,  and will cause each  Subsidiary  to preserve  and  maintain,  all its
leases, privileges,  licenses, permits, franchises,  qualifications,  and rights
that are necessary in the ordinary  conduct of its  business.  The Borrower will
conduct,  and will cause each Subsidiary to conduct,  its business in an orderly
and efficient manner in accordance with good business practices.

         Section 7.3  Maintenance  of  Properties.  The Borrower will  maintain,
keep, and preserve,  and cause each Subsidiary to maintain,  keep, and preserve,
all of its  properties  (tangible  and  intangible)  necessary  or useful in the
proper conduct of its business in good working order and condition.

         Section 7.4 Taxes and Claims.  The Borrower will pay or discharge,  and
will cause each Subsidiary to pay or discharge,  at or before maturity or before
becoming  delinquent:  (a) all  taxes,  levies,  assessments,  and  governmental
charges  imposed on it or its income or profits or any of its property,  and (b)
all lawful claims for labor,  material,  and supplies,  which, if unpaid,  might
become a Lien upon any of its property.

         Section 7.5 Insurance.  The Borrower will maintain, and will cause each
of the Subsidiaries to maintain,  insurance with financially sound and reputable
insurance  companies  in such  amounts  and  covering  such  risks as is usually
carried  by  corporations  engaged  in similar  businesses  and  owning  similar
properties in the same general areas in which the Borrower and the  Subsidiaries
operate,  provided that in any event the Borrower will maintain,  and cause each
Subsidiary to maintain,  workmen's compensation  insurance,  property insurance,
comprehensive  general  liability  insurance  (with Lender  named as  additional
insured),  reasonably  satisfactory  to the  Lender  and naming the Lender as an
additional  assured.  Each insurance  policy covering  Collateral shall name the
Lender as  additional  assured and loss payee and shall provide that such policy
will not be cancelled or reduced  without 30 days' prior  written  notice to the
Lender.

         Section 7.6 Inspection  Rights. At any reasonable time and from time to
time,  the  Borrower  will  permit,  and will cause each  Subsidiary  to permit,
representatives of the Lender to examine, copy, and make extracts from its books
and records,  to visit and inspect its properties,  and to discuss its business,
operations,   and  financial  condition  with  its  officers,   employees,   and
independent certified public accountants. The Borrower shall cooperate and cause
each  of  its  Subsidiaries  to  cooperate,  with  Lender's  Commercial  Finance
Department,

                                      -15-



<PAGE>



which shall perform an semi-annual asset audits, and the Borrower shall bear the
cost and expense of such audits.

         Section 7.7 Keeping Books and Records. The Borrower will maintain,  and
will cause each  Subsidiary  to maintain,  proper books of record and account in
which full,  true, and correct  entries in conformity  with GAAP in all material
respects  shall be made of all  dealings  and  transactions  in  relation to its
business and activities.

         Section 7.8 Compliance  with Laws.  The Borrower will comply,  and will
cause each  Subsidiary to comply,  in all material  respects with all applicable
laws, rules,  regulations,  orders, and decrees of any Governmental Authority or
arbitrator.

         Section 7.9  Compliance  with  Agreements.  The Borrower will, and will
cause each  Subsidiary to, comply in all material  respects with all agreements,
contracts,  and  instruments  binding  on  it or  affecting  its  properties  or
business.

         Section 7.10 Comply with Vessel Charters and Leases. The Borrower will,
and will cause each  Subsidiary  to, pay all  amounts  owing  under  charters or
leases of Vessels and leases of real  Property  where  Collateral  is stored and
shall  comply in all  material  respects  with all of the  terms and  provisions
thereof.

         Section 7.11 Vendors, Suppliers, Etc. The Borrower will, and will cause
each Subsidiary to, pay all of its vendors, suppliers and other Persons that may
assert a Lien on a Vessel or any Property of the Borrower and its Subsidiaries.

         Section 7.12 Further  Assurances.  The  Borrower  will,  and cause each
Subsidiary to, execute and deliver such further  agreements and  instruments and
take such further  action as may be reasonably  requested by the Lender to carry
out the  provisions  and purposes of this Agreement and the other Loan Documents
and to create, preserve, and perfect the Liens of the Lender in the Collateral.

         Section 7.13 ERISA. The Borrower will comply, and cause each Subsidiary
to  comply,  with all  minimum  funding  requirements,  and all  other  material
requirements,  of  ERISA,  if  applicable,  so as  not  to  give  any  liability
thereunder.

         Section 7.14 Annual  Collateral and Systems  Review.  At any reasonable
time and from time to time,  but not more than once during each six month period
unless a Default then exists,  in which case such reviews shall not be limited),
the Borrower will permit, the Lender and its  representatives,  at the sole cost
and  expense of the  Borrower,  to  conduct  audits of the  Borrower's  and each
Guarantor's   accounts  receivable  and  reviews  of  the  Borrower's  and  each
Guarantor's  accounts receivable control systems,  and in connection  therewith,
examine,  copy, and make extracts from the Borrower's and each Guarantor's books
and records, to visit and inspect their properties and facilities.


                                      -16-



<PAGE>



         Section 7.15 Lockbox.  The Borrower will direct its, and will cause the
Guarantors  to direct  their  account  debtors to send all  payments  on certain
agreed accounts to the Lockbox,  or if payment is to be made by wire transfer to
such Person,  then directed to the Lockbox Account.  Borrower will deliver,  and
cause each of the Guarantors to deliver, to the Lender, at the Lender's request,
copies of all  letters  and/or  sales  invoices  from such Person to its account
debtors  directing  that  accounts  be paid into  such  Lockbox  and/or  Lockbox
Account.

                                  ARTICLE VIII

                               Negative Covenants

         The Borrower  covenants and agrees that, as long the Obligations or any
part thereof are  outstanding  or the Lender has any Commitment  hereunder,  the
Borrower will perform and observe the following negative  covenants,  unless the
Lender shall otherwise consent in writing:

         Section 8.1 Debt.  The  Borrower  will not incur,  create,  assume,  or
permit to exist, and will not permit any Subsidiary to incur, create, assume, or
permit to exist,  any Debt (other than the Debt to the  Lender),  Guarantees  or
other liabilities or obligations without Lender's prior written approval, except
(1) open account trade debt incurred in the ordinary course of its business, (2)
Debt,  not to exceed  $1,200,000  for purchase of a new computer and  accounting
system  and to  increase  the  Borrower's  existing  fleet of  vibraseis  energy
sources,  as currently  contemplated on the date of this Agreement and disclosed
to the Lender in writing prior to the date hereof, (3) other Debt that shall not
exceed $750,000 in the aggregate and (4) the existing Debt described on Schedule
8.1 hereof.

         Section 8.2 Limitation on Liens.  The Borrower will not incur,  create,
assume, or permit to exist, and will not permit any Subsidiary to incur, create,
assume,  or permit  to exist,  any Lien  upon any of its  property,  assets,  or
revenues,  whether  now  owned  or  hereafter  acquired,  except  the  following
(collectively referred to as the "Permitted Liens"):

                  (a)      Liens disclosed on Schedule 8.2 hereto;

                  (b)      Liens in favor of the Lender;

                  (c)  Encumbrances   consisting  of  minor  easements,   zoning
         restrictions, or other restrictions on the use of real property that do
         not  (individually or in the aggregate)  materially affect the value of
         the assets  encumbered  thereby or materially impair the ability of the
         Borrower to use such assets in their respective businesses, and none of
         which is  violated  in any  material  respect by  existing  or proposed
         structures or land use;

                  (d)  Liens  for  taxes,  assessments,  or  other  governmental
         charges which are not  delinquent or which are being  contested in good
         faith and for which adequate reserves have been established;


                                      -17-



<PAGE>



                  (e) Liens of mechanics, materialmen,  warehousemen,  carriers,
         or other similar statutory Liens securing  obligations that are not yet
         due and are incurred in the ordinary course of business

                  (f)  Liens  resulting  from  good  faith  deposits  to  secure
         payments of workmen's compensation or other social security programs or
         to secure the performance of tenders, statutory obligations, surety and
         appeal bonds,  bids, or contracts  (other than for payment of Debt), or
         leases made in the ordinary course of business; and

                  (g) Liens  securing on the purchase price of, or Capital Lease
         Obligations in respect of, equipment  (other than Equipment),  provided
         that (i) such Lien does not cover any other Property of the Borrower or
         any  Subsidiary  and (ii) the Debt secured by Lien is  permitted  under
         Section 8.1 of the Agreement.

         Section  8.3  Mergers,  Etc.  Without  Lender's  written  consent,  the
Borrower  will not, and will not permit any  Subsidiary  to, become a party to a
merger or consolidation, or purchase or otherwise acquire all or any part of the
assets of any Person or any shares or other evidence of beneficial  ownership of
any Person,  other than in respect to the transaction  described on Schedule 8.3
hereof, or wind-up, dissolve, or liquidate.

         Section 8.4  Restricted  Payments.  Except as provided in Schedule 8.4,
the Borrower  will not declare or pay any dividends or make any other payment or
distribution  (in cash,  property,  or  obligations)  on account of its  capital
stock,  or redeem,  purchase,  retire,  or otherwise  acquire any of its capital
stock, or permit any of their  respective  Subsidiaries to purchase or otherwise
acquire any capital  stock of the Borrower or another  Subsidiary,  or set apart
any  money for a  sinking  or other  analogous  fund for any  dividend  or other
distribution on its capital stock or for any redemption,  purchase,  retirement,
or other acquisition of any of its capital stock.

         Section 8.5 Loans and  Investments.  Without  Lender's written consent,
which consent will not be unreasonably withheld, the Borrower will not make, and
will not permit any Subsidiary to make, any advance,  loan, extension of credit,
or  capital  contribution  to or  investment  in, or  purchase,  or  permit  any
Subsidiary to purchase, any stock, bonds, notes, debentures, or other securities
of any Person, except:

                  (a) readily marketable direct obligations of the United States
         of America or any agency  thereof with  maturities  of one year or less
         from the date of acquisition;

                  (b) fully insured  certificates  of deposit with maturities of
         one year or less from the date of acquisition  of any  commercial  bank
         operating in the United States having  capital and surplus in excess of
         $50,000,000;


                                      -18-



<PAGE>



                  (c)  commercial  paper of a domestic  issuer if at the time of
         purchase  such  paper  is  rated  in  one  of the  two  highest  rating
         categories  of Standard  and Poor's  Corporation  or Moody's  Investors
         Service, Inc.; and

                  (d) in the case of Geo, short-term investments of its revenues
         and funds in Mexican pesos in responsible Mexican institutions.

         Section 8.6  Limitation  on Issuance of Capital  Stock.  Except for the
matters referred to on Schedule 8.6 hereof,  the Borrower will not, and will not
permit any of its Subsidiaries to, at any time issue, sell, assign, or otherwise
dispose of (a) any of its capital stock, (b) any securities  exchangeable for or
convertible  into or carrying any rights to acquire any of its capital stock, or
(c) any option, warrant, or other right to acquire any of its capital stock.

         Section 8.7 Transactions  With Affiliates.  The Borrower will not enter
into,  and will not permit any  Subsidiaries  to enter  into,  any  transaction,
including,  without limitation,  the purchase,  sale, or exchange of property or
the  rendering  of any  service,  with any  Affiliate  of the  Borrower  or such
Subsidiary,  except in the  ordinary  course of and  pursuant to the  reasonable
requirements of the Borrower's or such  Subsidiary's  business and upon fair and
reasonable terms no less favorable to the Borrower or such Subsidiary than would
be  obtained  in a  comparable  arm's-length  transaction  with a Person  not an
Affiliate of the Borrower or such Subsidiary.

         Section 8.8 Disposition of Assets.  The Borrower will not sell,  lease,
assign,  transfer,  or  otherwise  dispose of any of its  assets,  or permit any
Subsidiary to do so with any of its assets, except (i) dispositions of inventory
in the ordinary course of business and (ii) dispositions of obsolete  equipment,
not to exceed  $300,000 in value in any year during the term  hereof,  provided,
however, in no event shall Borrower sell, lease, assign, transfer, or dispose of
(i) any of its assets for less than fair value,  or (ii) any Property  purchased
from the Manufacturer.

         Section 8.9 Sale and  Leaseback.  The Borrower will not enter into, and
will not permit any  Subsidiary to enter into, any  arrangement  with any Person
pursuant to which it leases from such Person real or personal  property that has
been or is to be sold or  transferred,  directly  or  indirectly,  by it to such
Person.

         Section 8.10 Prepayment of Debt. The Borrower will not prepay, and will
not permit any  Subsidiary  to prepay,  any Debt from and after the date hereof,
except the Obligations.

         Section  8.11 Nature of Business.  The Borrower  will not, and will not
permit any  Subsidiary  to, engage in any business  other than, or unrelated to,
the businesses in which it is engaged as of the date hereof.

         Section 8.12 Environmental Protection.  The Borrower will not, and will
not permit any of its Subsidiaries to, (a) use (or permit any tenant to use) any
of  its   properties   or  assets  for  the   handling,   processing,   storage,
transportation,  or  disposal  of  any  Hazardous  Material,  (b)  generate  any
Hazardous Material, (c) conduct any activity that is likely to cause a Release

                                      -19-



<PAGE>



or threatened  Release of any Hazardous  Material,  or (d) otherwise conduct any
activity or use any of their respective  properties or assets in any manner that
is likely  to  violate  any  Environmental  Law or  result in any  Environmental
Liabilities  for  which  the  Borrower  or  any  of its  Subsidiaries  would  be
responsible  and which would have a material  adverse  effect on the Borrower or
any of its  Subsidiaries  or would  result  in civil or  criminal  liability  to
Lender.

         Section 8.13 Accounting. The Borrower will not, and will not permit any
of its  Subsidiaries  to,  change  its  fiscal  year or make any  change  (a) in
accounting  treatment  or  reporting  practices,  except as required by GAAP and
disclosed to the Lender, or (b) in tax reporting  treatment,  except as required
by law and disclosed to the Lender.

                                   ARTICLE IX

                               Financial Covenants

         The Borrower  covenants and agrees that, as long as the  Obligations or
any part thereof are outstanding or the Lender has any Commitment hereunder, the
Borrower will observe and perform the following financial covenants,  unless the
Lender shall otherwise consent in writing:

         Section  9.1 EBITDA  Coverage  Ratio.  The  Borrower  will at all times
maintain an EBITDA  Coverage Ratio of at least 1.3 to 1.0.  (Beginning  April 1,
1997,  the covenant  shall be calculated on a rolling 12 month basis;  the first
test of this covenant shall be for the period ending September 30, 1996; and the
September  30,  1996 test  shall be  calculated  on an  annualized  basis  using
preceding six month EBITDA (with subsequent periods until April 1, 1997 being on
an annualized based with each month after September 1996 included).

         Section 9.2  Consolidated  Tangible Net Worth. The Borrower will at all
times maintain Consolidated Tangible Net Worth in an amount at least $20,000,000
plus,  on  a  cumulative   basis  beginning  June  30,  1996,  50%  of  positive
consolidated Net Income and 90% of the net proceeds of each equity offering.

         Section 9.3 Leverage  Ratio.  The Borrower will at all times maintain a
Leverage Ratio of not greater than 1.3 to 1.0.

                                    ARTICLE X

                                     Default

         Section 10.1 Events of Default.  Each of the following  shall be deemed
an "Event of Default":

                  (a) The Borrower shall fail to pay when due the Obligations or
         any part thereof.


                                      -20-



<PAGE>



                  (b) Any representation or warranty made by the Borrower or any
         Obligated  Party  (or any of  their  respective  officers)  in any Loan
         Document or in any certificate,  report, notice, or financial statement
         furnished at any time in connection with this Agreement shall be false,
         misleading, or erroneous in any material respect when made or deemed to
         have been made.

                  (c) The Borrower, any Subsidiary, or any Obligated Party shall
         fail to perform,  observe, or comply with any covenant,  agreement,  or
         term contained in this Agreement or any of the other Loan Documents.

                  (d) The Borrower, any Subsidiary, or any Obligated Party shall
         commence a voluntary proceeding seeking liquidation, reorganization, or
         other relief with respect to itself or its debts under any  bankruptcy,
         insolvency,  or other similar law now or hereafter in effect or seeking
         the appointment of a trustee, receiver, liquidator, custodian, or other
         similar  official of it or a substantial  part of its property or shall
         consent  to  any  such  relief  or to  the  appointment  of  or  taking
         possession  by any  such  official  in an  involuntary  case  or  other
         proceeding  commenced against it or shall make a general assignment for
         the benefit of  creditors or shall  generally  fail to pay its debts as
         they become due or shall take any corporate  action to authorize any of
         the foregoing.

                  (e) An involuntary  proceeding shall be commenced  against the
         Borrower,  any Subsidiary,  or any Obligated Party seeking liquidation,
         reorganization,  or other  relief with respect to it or its debts under
         any  bankruptcy,  insolvency,  or other similar law now or hereafter in
         effect or seeking the appointment of a trustee,  receiver,  liquidator,
         custodian,  or other similar  official for it or a substantial  part of
         its property,  and such involuntary proceeding shall remain undismissed
         and unstayed for a period of 60 days.

                  (f) The Borrower, any Subsidiary, or any Obligated Party shall
         fail to  discharge  within a period of 30 days  after the  commencement
         thereof  any  attachment,   sequestration,  or  similar  proceeding  or
         proceedings  involving an aggregate amount in excess of $50,000 against
         any of its assets or properties.

                  (g) A final  judgment or judgments for the payment of money in
         excess of  $50,000 in the  aggregate  shall be  rendered  by a court or
         courts against the Borrower, any Subsidiary, or any Obligated Party and
         the same shall not be discharged  (or  provision  shall not be made for
         such discharge),  or a stay of execution thereof shall not be procured,
         within 30 days from the date of entry  thereof and the  Borrower or the
         relevant Subsidiary or Obligated Party shall not, within said period of
         30 days, or such longer period during which execution of the same shall
         have been stayed,  appeal therefrom and cause the execution  thereof to
         be stayed during such appeal.

                  (h) The Borrower,  any Subsidiary or any Obligated Party shall
         fail to pay when due any  principal  of or  interest on any Debt (other
         than the  Obligations),  or the  maturity  of any Debt  shall have been
         accelerated or required to be prepaid prior to the

                                      -21-



<PAGE>



         stated maturity thereof,  or any event shall have occurred that permits
         (or, with the giving of notice or lapse of time or both,  would permit)
         any holder or  holders  of such Debt or any Person  acting on behalf of
         such holder or holders to  accelerate  the maturity  thereof or require
         any such prepayment.

                  (i) This  Agreement or any other Loan Document  shall cease to
         be in full force and effect or shall be  declared  null and void or the
         validity or enforceability  thereof shall be contested or challenged by
         the  Borrower,  any  Subsidiary,  any  Obligated  Party or any of their
         respective  shareholders,  or the Borrower or any Obligated Party shall
         deny that it has any further  liability or obligation  under any of the
         Loan Documents,  or any lien or security  interest  created by the Loan
         Documents  shall for any  reason  cease to be a valid,  first  priority
         perfected  security  interest  in and lien  upon any of the  Collateral
         purported  to be covered  thereby  (except for  Permitted  Liens on the
         Collateral).

                  (j) Any of the  following  events  shall  occur or exist  with
         respect to the  Borrower  or any ERISA  Affiliate:  (i) any  Prohibited
         Transaction  involving any Plan; (ii) any Reportable Event with respect
         to any Plan;  (iii) the filing under  Section 4041 of ERISA of a notice
         of intent to terminate any Plan or the  termination  of any Plan;  (iv)
         any event or circumstance  that might constitute  grounds entitling the
         PBGC to  institute  proceedings  under  Section  4042 of ERISA  for the
         termination of, or for the appointment of a trustee to administer,  any
         Plan, or the  institution by the PBGC of any such  proceedings;  or (v)
         complete or partial withdrawal under Section 4201 or 4204 of ERISA from
         a Multiemployer Plan or the reorganization,  insolvency, or termination
         of any  Multiemployer  Plan;  and in each  case  above,  such  event or
         condition,  together with all other events or conditions,  if any, have
         subjected or could in the reasonable  opinion of the Lender subject the
         Borrower  to  any  tax,  penalty,  or  other  liability  to a  Plan,  a
         Multiemployer Plan, the PBGC, or otherwise (or any combination thereof)
         which in the aggregate exceed or could reasonably be expected to exceed
         $25,000.

                  (k)  The  Borrower  shall  fail to  have  at  least  $1 of net
         operating income during any two consecutive quarters.

                  (l) The  Borrower  or any  Obligated  Party,  or any of  their
         properties,  revenues,  or assets,  shall become subject to an order of
         forfeiture,  seizure, or divestiture  (whether under RICO or otherwise)
         and the same  shall  not have been  discharged  within 30 days from the
         date of entry thereof.

         Section 10.2 Remedies Upon Default. If any Event of Default shall occur
and be continuing,  the Lender may without  notice except as expressly  provided
herein declare the  Obligations  or any part thereof to be  immediately  due and
payable,  and the same  shall  thereupon  become  immediately  due and  payable,
without  further  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 the Borrower;  provided, however, that upon the occurrence of an Event
of Default under Section

                                      -22-


<PAGE>



10.1(d) or Section 10.1(e), and 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 the Borrower.  If any Event of Default shall occur and be  continuing,
the Lender may  exercise  all rights and  remedies  available to it in law or in
equity, under the Loan Documents,  or otherwise.  Notwithstanding the provisions
set forth above,  if the  Manufacturer is the sole cause of an Event of Default,
the Borrower shall have 30 days after notice from the Lender in which to satisfy
Lender by providing additional security or guaranties (satisfactory to Lender in
its sole discretion)  before the Lender exercises its remedies as a result of an
Event of Default resulting from Default by the Manufacturer.

         Section 10.3  Performance by the Lender.  If the Borrower shall fail to
perform any covenant or agreement  contained in any of the Loan  Documents,  the
Lender may perform or attempt to perform such covenant or agreement on behalf of
the Borrower.  In such event,  the Borrower shall, at the request of the Lender,
promptly  pay  any  amount  expended  by the  Lender  in  connection  with  such
performance  or attempted  performance  to the Lender,  together  with  interest
thereon at the Default Rate from and including the date of such  expenditure  to
but excluding the date such  expenditure  is paid in full.  Notwithstanding  the
foregoing,  it is expressly  agreed that the Lender shall not have any liability
or  responsibility  for the  performance of any obligation of the Borrower under
this Agreement or any other Loan Document.

                                   ARTICLE XI

                                  Miscellaneous

         Section 11.1 Expenses. The Borrower hereby agrees to pay on demand: (a)
all  costs  and  expenses  of the  Lender in  connection  with the  preparation,
negotiation,  execution,  and  delivery  of this  Agreement  and the other  Loan
Documents and any and all amendments,  modifications,  renewals, extensions, and
supplements thereof and thereto,  including,  without  limitation,  the fees and
expenses  of legal  counsel for the  Lender,  (b) all costs and  expenses of the
Lender in connection  with any Default and the  enforcement of this Agreement or
any other Loan Document, including, without limitation, the fees and expenses of
legal counsel for the Lender,  (c) all transfer,  stamp,  documentary,  or other
similar taxes,  assessments,  or charges levied by any Governmental Authority in
respect of this  Agreement  or any of the other Loan  Documents,  (d) all costs,
expenses, assessments, and other charges incurred in connection with any filing,
registration,  recording,  or  perfection  of  any  security  interest  or  Lien
contemplated  by this  Agreement or any other Loan  Document,  and (e) all other
costs and expenses  incurred by the Lender in connection  with this Agreement or
any other Loan Document, including, without limitation, all costs, expenses, and
other  charges  incurred  in  connection  with  obtaining  any  mortgagee  title
insurance policy, survey, audit, or appraisal in respect of the Collateral.

         SECTION 11.2  INDEMNIFICATION.  THE BORROWER SHALL INDEMNIFY THE LENDER
AND EACH AFFILIATE THEREOF AND THEIR RESPECTIVE OFFICERS, DIRECTORS,  EMPLOYEES,
ATTORNEYS, AND AGENTS FROM, AND

                                      -23-



<PAGE>



HOLD EACH OF THEM HARMLESS  AGAINST,  ANY AND ALL LOSSES,  LIABILITIES,  CLAIMS,
DAMAGES,  PENALTIES,  JUDGMENTS,  DISBURSEMENTS,  COSTS, AND EXPENSES (INCLUDING
ATTORNEYS'  FEES) TO WHICH ANY OF THEM MAY  BECOME  SUBJECT  WHICH  DIRECTLY  OR
INDIRECTLY  ARISE FROM OR RELATE TO (A) THE  NEGOTIATION,  EXECUTION,  DELIVERY,
PERFORMANCE,  ADMINISTRATION,  OR ENFORCEMENT OF ANY OF THE LOAN DOCUMENTS,  (B)
ANY OF THE  TRANSACTIONS  CONTEMPLATED BY THE LOAN DOCUMENTS,  (C) ANY BREACH BY
THE  BORROWER OF ANY  REPRESENTATION,  WARRANTY,  COVENANT,  OR OTHER  AGREEMENT
CONTAINED IN ANY OF THE LOAN DOCUMENTS BY ANY PERSON OTHER THAN THE LENDER,  (D)
THE PRESENCE,  RELEASE, THREATENED RELEASE, DISPOSAL, REMOVAL, OR CLEANUP OF ANY
HAZARDOUS MATERIAL LOCATED ON, ABOUT, WITHIN, OR AFFECTING ANY OF THE PROPERTIES
OR  ASSETS  OF  THE  BORROWER  OR ANY  SUBSIDIARY,  OR  (E)  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 OF ANY OTHER LOAN
DOCUMENT,  IT IS THE EXPRESS INTENTION OF THE PARTIES HERETO THAT EACH PERSON TO
BE INDEMNIFIED  UNDER THIS SECTION SHALL BE  INDEMNIFIED  FROM AND HELD HARMLESS
AGAINST ANY AND ALL LOSSES, LIABILITIES,  CLAIMS, DAMAGES, PENALTIES, JUDGMENTS,
DISBURSEMENTS, COSTS, AND EXPENSES (INCLUDING ATTORNEYS' FEES) ARISING OUT OF OR
RESULTING FROM THE SOLE OR  CONTRIBUTORY  NEGLIGENCE OF SUCH PERSON,  BUT NOT IN
RESPECT OF LENDER'S GROSS NEGLIGENCE OR WILLFUL MISCONDUCT.

         SECTION  11.3  LIMITATION  OF  LIABILITY.  NEITHER  THE  LENDER NOR ANY
AFFILIATE,  OFFICER, DIRECTOR,  EMPLOYEE, ATTORNEY, OR AGENT OF THE LENDER SHALL
HAVE ANY LIABILITY WITH RESPECT TO, AND THE BORROWER  HEREBY  WAIVES,  RELEASES,
AND  AGREES NOT TO SUE ANY OF THEM UPON,  ANY CLAIM FOR ANY  SPECIAL,  INDIRECT,
INCIDENTAL,  OR  CONSEQUENTIAL  DAMAGES  SUFFERED OR INCURRED BY THE BORROWER IN
CONNECTION WITH, ARISING OUT OF, OR IN ANY WAY RELATED TO, THIS AGREEMENT OR ANY
OF THE OTHER LOAN  DOCUMENTS,  OR ANY OF THE  TRANSACTIONS  CONTEMPLATED BY THIS
AGREEMENT  OR ANY OF THE OTHER  LOAN  DOCUMENTS.  THE  BORROWER  HEREBY  WAIVES,
RELEASES,  AND AGREES NOT TO SUE THE LENDER OR ANY OF THE  LENDER'S  AFFILIATES,
OFFICERS,  DIRECTORS,  EMPLOYEES,  ATTORNEYS,  OR AGENTS FOR PUNITIVE DAMAGES IN
RESPECT OF ANY CLAIM IN CONNECTION  WITH,  ARISING OUT OF, OR IN ANY WAY RELATED
TO,  THIS  AGREEMENT  OR  ANY  OF  THE  OTHER  LOAN  DOCUMENTS,  OR  ANY  OF THE
TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT OR ANY OF THE OTHER LOAN DOCUMENTS.


                                      -24-



<PAGE>



         SECTION 11.4 LENDER NOT MANUFACTURER;  DISCLAIMER. BORROWER UNDERSTANDS
AND  AGREES  THAT THE  LENDER IS NOT THE  MANUFACTURER  OF THE  EQUIPMENT  BEING
PURCHASED  BY  BORROWER  IN THE  ACQUISITION.  LENDER  MAKES  NO  WARRANTIES  OR
REPRESENTATIONS TO BORROWER, EITHER EXPRESS OR IMPLIED, AS TO:

         (A)      THE  CONDITION,   DESIGN,   OPERATION,   FITNESS  FOR  USE  OR
                  MERCHANTABILITY OF THE EQUIPMENT;

         (B)      THE FITNESS OF THE  EQUIPMENT  FOR ANY  PARTICULAR  PURPOSE OF
                  BORROWER;

         (C)      THE VALUE OR WORTHINESS OF THE EQUIPMENT; OR

         (D)      ANY OTHER MATTER WHATSOEVER,  IT BEING EXPRESSLY AGREED BY THE
                  PARTIES THAT ALL RISKS. RELATING TO OR ARISING FROM BORROWER'S
                  USE AND OPERATION OF THE EQUIPMENT  SHALL BE BORNE AND ASSUMED
                  SOLELY BY BORROWER.

WITHOUT LIMITING THE GENERALITY OF THE FOREGOING, LENDER SHALL NOT BE LIABLE FOR
ANY DEFECTS,  EITHER  LATENT OR PATENT,  IN THE  EQUIPMENT  NOR FOR ANY GENERAL,
CONSEQUENTIAL OR INCIDENTAL DAMAGES, INCLUDING,  WITHOUT LIMITATION, ANY DAMAGES
FOR DIMINUTION OF MARKET VALUE, LOSS OF USE OF THE EQUIPMENT, LOSS OF PROFITS OR
FOR ANY INTERRUPTION IN BORROWER'S  BUSINESS  OCCASIONED BY ITS INABILITY TO USE
THE  EQUIPMENT  FOR ANY REASON  WHATSOEVER.  LENDER  SHALL NOT BE LIABLE FOR ANY
DAMAGES  CLAIMED BY BORROWER OR ANY OTHER  PERSON OR ENTITY UPON THE THEORIES OF
NEGLIGENCE  OR STRICT  LIABILITY  IN TORT.  IN NO EVENT  SHALL ANY DEFECT IN, OR
UNFITNESS OF, THE
EQUIPMENT RELIEVE BORROWER OF ITS OBLIGATION TO MAKE PAYMENTS REQUIRED UNDER THE
NOTE, NOR RELIEVE BORROWER OF ANY OTHER OBLIGATION HEREUNDER.

         Section  11.5 No Defenses.  The  Borrower  will not assert any defense,
claim,  counterclaim  or charge  against the Lender  with  respect to payment or
performance of the Obligations because of a breach of warranty or representation
of the  Manufacturer,  as the seller and the manufacturer of the equipment,  the
purchase of which is being financed by this Term Loan.

         Section 11.6 No Duty. All attorneys, accountants, appraisers, and other
professional Persons and consultants retained by the Lender shall have the right
to act  exclusively  in the  interest  of the  Lender  and shall have no duty of
disclosure,  duty of loyalty,  duty of care,  or other duty or obligation of any
type or nature whatsoever to the Borrower or any of the Borrower's  shareholders
or any other Person.


                                      -25-



<PAGE>



         Section  11.7  Lender  Not  Fiduciary.  The  relationship  between  the
Borrower  and the Lender is solely that of debtor and  creditor,  and the Lender
has no fiduciary or other special relationship with the Borrower, and no term or
condition  of any of the Loan  Documents  shall be  construed  so as to deem the
relationship between the Borrower and the Lender to be other than that of debtor
and creditor.

         Section 11.8 No Waiver;  Cumulative Remedies. No failure on the part of
the Lender 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 and the other Loan  Documents are cumulative and
not exclusive of any rights and remedies provided by law

         Section 11.9 Successors and Assigns. This Agreement is binding upon and
shall inure to the benefit of the Lender and the Borrower  and their  respective
successors and assigns,  except that the Borrower may not assign or transfer any
of its rights or  obligations  under this  Agreement  without the prior  written
consent of the Lender.

         Section 11.10 Survival. All representations and warranties made in this
Agreement  or  any  other  Loan  Document  or in  any  document,  statement,  or
certificate  furnished  in  connection  with this  Agreement  shall  survive the
execution and delivery of this  Agreement and the other Loan  Documents,  and no
investigation by the Lender or any closing shall affect the  representations and
warranties  or the right of the Lender to rely upon them.  Without  prejudice to
the survival of any other obligation of the Borrower hereunder,  the obligations
of the Borrower  under  Sections  11.1 and 11.2 shall  survive  repayment of the
Notes.

         Section 11.11 ENTIRE AGREEMENT;  AMENDMENT.  THIS AGREEMENT, THE NOTES,
AND THE OTHER  LOAN  DOCUMENTS  REFERRED  TO HEREIN  EMBODY  THE  FINAL,  ENTIRE
AGREEMENT AMONG THE PARTIES HERETO AND SUPERSEDE ANY AND ALL PRIOR  COMMITMENTS,
AGREEMENTS,  REPRESENTATIONS,  AND  UNDERSTANDINGS,  WHETHER  WRITTEN  OR  ORAL,
RELATING TO THE SUBJECT MATTER HEREOF 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  and the other Loan  Documents  to which the
Borrower  is a party may be amended or waived only by an  instrument  in writing
signed by the parties hereto.

         Section 11.12 Maximum  Interest Rate. No provision of this Agreement or
any other Loan Document  shall require the payment or the collection of interest
in excess of the maximum  amount  permitted by applicable  law. If any excess of
interest in such respect is hereby  provided for, or shall be  adjudicated to be
so provided,  in any Loan  Document or otherwise  in  connection  with this loan
transaction, the provisions of this Section shall govern and prevail and neither
the

                                      -26-



<PAGE>



Borrower nor the sureties,  guarantors,  successors,  or assigns of the Borrower
shall be obligated to pay the excess amount of such interest or any other excess
sum paid for the use, forbearance,  or detention of sums loaned pursuant hereto.
In the event the Lender ever receives, collects, or applies as interest any such
sum,  such amount  which would be in excess of the maximum  amount  permitted by
applicable  law shall be applied as a payment and  reduction of the principal of
the indebtedness  evidenced by the Notes; and, if the principal of the Notes has
been paid in full, any remaining excess shall forthwith be paid to the Borrower.
In determining  whether or not the interest paid or payable  exceeds the Maximum
Rate, the Borrower and the Lender shall,  to the extent  permitted by applicable
law, (a) characterize any non-principal  payment as an expense,  fee, or premium
rather than as  interest,  (b)  exclude  voluntary  prepayments  and the effects
thereof,  and (c) amortize,  promote,  allocate,  and spread in equal or unequal
parts the total amount of interest  throughout the entire  contemplated  term of
the  indebtedness  evidenced  by the Notes so that  interest for the entire term
does not exceed the Maximum Rate.

         Section 11.13 Notices.  All notices and other  communications  provided
for in this  Agreement  and the other Loan  Documents to which the Borrower is a
party shall be given or made by telecopy or in writing and telecopied, mailed by
certified mail return receipt requested,  or delivered to the intended recipient
at the "Address for Notices"  specified  below its name on the  signature  pages
hereof; or, as to any party at such other address as shall be designated by such
party in a notice to the other  party  given in  accordance  with this  Section.
Except as otherwise provided in this Agreement, all such communications shall be
deemed to have  been  duly  given  when  transmitted  by  telecopy,  subject  to
telephone  confirmation of receipt, or when personally delivered or, in the case
of a mailed  notice,  when duly  deposited  in the mails,  in each case given or
addressed as aforesaid;  provided,  however,  notices to the Lender  pursuant to
Article II or III shall not be effective until received by the Lender.

         SECTION 11.14 GOVERNING 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.  ANY ACTION OR  PROCEEDING  AGAINST THE
BORROWER UNDER OR IN CONNECTION WITH ANY OF THE LOAN DOCUMENTS MAY BE BROUGHT IN
ANY  STATE OR  FEDERAL  COURT IN  HARRIS  COUNTY,  TEXAS.  THE  BORROWER  HEREBY
IRREVOCABLY (A) SUBMITS TO THE NONEXCLUSIVE JURISDICTION OF SUCH COURTS, AND (B)
WAIVES ANY  OBJECTION IT MAY NOW OR  HEREAFTER  HAVE AS TO THE VENUE OF ANY SUCH
ACTION OR  PROCEEDING  BROUGHT  IN ANY SUCH  COURT OR THAT ANY SUCH  COURT IS AN
INCONVENIENT  FORUM.  THE BORROWER AGREES THAT SERVICE OF PROCESS UPON IT MAY BE
MADE BY CERTIFIED OR REGISTERED MAIL, RETURN RECEIPT  REQUESTED,  AT ITS ADDRESS
SPECIFIED OR  DETERMINED  IN ACCORDANCE  WITH THE  PROVISIONS OF SECTION  11.11.
NOTHING HEREIN OR IN ANY OF THE OTHER LOAN  DOCUMENTS  SHALL AFFECT THE RIGHT OF
THE LENDER TO SERVE PROCESS IN ANY OTHER MANNER  PERMITTED BY LAW OR SHALL LIMIT
THE

                                      -27-



<PAGE>



RIGHT OF THE LENDER TO BRING ANY ACTION OR  PROCEEDING  AGAINST THE  BORROWER OR
WITH RESPECT TO ANY OF ITS PROPERTY IN COURTS IN OTHER JURISDICTIONS. ANY ACTION
OR  PROCEEDING  BY THE  BORROWER  AGAINST THE LENDER  SHALL BE BROUGHT ONLY IN A
COURT LOCATED IN HARRIS COUNTY, TEXAS.

         Section 11.15  Counterparts.  This  Agreement may be executed in one or
more counterparts,  each of which shall be deemed an original,  but all of which
together shall constitute one and the same instrument.

         Section 11.16  Severability.  Any provision of this Agreement held by a
court of competent  jurisdiction to be invalid or unenforceable shall not impair
or invalidate  the remainder of this  Agreement and the effect  thereof shall be
confined to the provision held to be invalid or illegal.

         Section 11.17 Headings.  The headings,  captions, and arrangements used
in  this  Agreement  are  for   convenience   only  and  shall  not  affect  the
interpretation of this Agreement.

         Section 11.18  Non-Application  of Chapter 15 of Texas Credit Code. The
provisions of Chapter 15 of the Texas Credit Code (Vemon's Texas Civil Statutes,
Article  5069-15)  are  specifically  declared by the  parties  hereto not to be
applicable  to this  Agreement  or any of the  other  Loan  Documents  or to the
transactions contemplated hereby.

         Section  11.19  Participations.  The Lender shall have the right at any
time and from time to time to grant participations in the Revolving Credit Note,
the Term Note and any other Loan Documents.  Each actual or proposed participant
shall be entitled to receive all  information  received by the Lender  regarding
the  Borrower,  including,  without  limitation,   information  required  to  be
disclosed to a  participant  pursuant to Banking  Circular 181 (Rev.,  August 2,
1984), issued by the Comptroller of the Currency (whether the actual or proposed
participant is subject to the circular or not).

         Section  11.20  Construction.  The Borrower and the Lender  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  and the other  Loan
Documents  with its legal  counsel  and that this  Agreement  and the other Loan
Documents  shall be  construed  as if jointly  drafted by the  Borrower  and the
Lender.

         Section 11.21 Independence of Covenants.  All covenants hereunder shall
be given  independent  effect so that if a particular action or condition is not
permitted  by any of such  covenants,  the fact that it would be permitted by an
exception to, or be otherwise  within the limitations of, another covenant shall
not avoid the  occurrence of a Default if such action is taken or such condition
exists.


                                      -28-



<PAGE>



         SECTION  11.22 DTPA WAIVER,  TO THE MAXIMUM  EXTENT NOT  PROHIBITED  BY
APPLICABLE  LAW FROM TIME TO TIME IN  EFFECT,  THE  BORROWER  HEREBY  KNOWINGLY,
VOLUNTARILY,  AND  INTENTIONALLY  (AND AFTER THE BORROWER HAS CONSULTED WITH ITS
OWN ATTORNEY) IRREVOCABLY AND UNCONDITIONALLY WAIVES THE PROVISIONS OF THE TEXAS
DECEPTIVE TRADE PRACTICES -- CONSUMER PROTECTION ACT (TX.
BUS. & COMM. CODE, CH. 17, SS. 17.41-17.63).

         Section 11.23 Arbitration Program. The parties agree to be bound by the
terms and conditions of the current Arbitration Program of First Interstate Bank
of  Texas,   N.A.,  which  is  incorporated   herein  by  reference  herein  and
acknowledged as received by the parties,  pursuant to which any and all disputes
shall be  resolved  by  mandatory  binding  arbitration  upon the request of any
party.



                                      -29-



<PAGE>



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

                                     BORROWER:

                                     3-D GEOPHYSICAL, INC.


                                     By:____________________________________
                                              J.D. White, Secretary

                                     Address for Notices:
                                     7076 S. Alton Way
                                     Building H
                                     Englewood, Colorado  80112
                                     Fax No.:              (303) 290-0447
                                     Telephone No.:        (303) 741-3700
                                     Attention:            President

                                     LENDER:

                                     FIRST INTERSTATE BANK OF TEXAS, N.A.



                                     By:____________________________________
                                              Randy Wade, Banking Officer

                                     Address for Notices:
                                     1000 Louisiana
                                     Houston, Texas  77002
                                     Fax No.:               (713) 250-7031
                                     Telephone No.:        (713) 250-4833
                                     Attention:            Marc A. Dunmire



                                      -30-



<PAGE>



                                   APPENDIX A

                                   Definitions

         "Advance" means, as applicable,  any of a Revolving Credit Advance or a
Term Loan Advance.

         "Advance  Request  Form"  means,  as  applicable,  a Term Loan  Advance
Request Form and a Revolving Credit Advance Request Form.

         "Affiliate" means, as to any Person, any other Person (a) that directly
or indirectly, through one or more intermediaries, controls or is controlled by,
or is under common  control with,  such Person;  (b) that directly or indirectly
beneficially  owns or holds five percent or more of any class of voting stock of
such  Person;  or (c)  five  percent  or more of the  voting  stock  of which is
directly or indirectly beneficially owned or held by the Person in question. The
term "control"  means the  possession,  directly or indirectly,  of the power to
direct or cause  direction of the management  and policies of a Person,  whether
through the ownership of voting securities, by contract, or otherwise; provided,
however, in no event shall the Lender be deemed an Affiliate of the Borrower.

         "Applicable Rate" means the Prime Rate, as it varies, plus one percent.

         "Borrowing Base" means, at any time, an amount equal to 70% of Eligible
Accounts (the value of any Eligible  Accounts  denominated in Pesos shall be the
Lender's quoted exchange rate on the last day of the applicable month).

         "Borrowing Base Report" means a monthly report of the Borrowing Base in
substantially the form of Exhibit "C" hereto.

         "Business  Day"  means  any  day on  which  commercial  banks  are  not
authorized or required to close in Houston, Texas.

         "Capital Lease Obligations" means, as to any Person, the obligations of
such Person to pay rent or other  amounts  under a lease of (or other  agreement
conveying the right to use) real and/or personal property, which obligations are
required to be  classified  and  accounted  for as a capital  lease on a balance
sheet of such Person under GAAP. For purposes of this  Agreement,  the amount of
such  Capital  Lease  Obligations  shall  be  the  capitalized  amount  thereof,
determined in accordance with GAAP.

         "Code" means the Internal  Revenue  Code of 1986,  as amended,  and the
regulations promulgated and rulings issued thereunder.

         "Collateral" has the meaning specified in Section 5.1.





<PAGE>



         "Debt" means as to any Person at any time  (without  duplication):  (a)
all obligations of such Person for borrowed  money,  (b) all obligations of such
Person evidenced by bonds, notes, debentures, or other similar instruments,  (c)
all obligations of such Person to pay the deferred purchase price of property or
services,  except trade accounts  payable of such Person arising in the ordinary
course  of  business  which  are not past due by more than 120 days or which all
being  contested  in good  faith in an  appropriate  manner  and by  appropriate
proceedings  and against  which such Person has provided  adequate  reserves and
which do not result in a lien against  Property of such Person,  (d) all Capital
Lease Obligations of such Person,  (e) all Debt or other obligations  Guaranteed
by such Person, (f) all obligations secured by a Lien existing on property owned
by such Person, whether or not the obligations secured thereby have been assumed
by such  Person  or are  non-recourse  to the  credit  of such  Person,  (g) all
reimbursement  obligations of such Person  (whether  contingent or otherwise) in
respect of letters of credit,  bankers'  acceptances,  surety or other bonds and
similar  instruments,  and (h) all  liabilities  of such  Person in  respect  of
unfunded vested benefits under any Plan.

         "Debt  Service"  means,  with  respect  to any  period,  the sum of all
scheduled  principal  payments of  long-term  Debt of the  Borrower  (including,
without limitation, the Term Loan) for such period plus all interest expense for
such period.

         "Default"  means an Event of Default or the  occurrence  of an event or
condition  which with  notice or lapse of time or both would  become an Event of
Default.

         "Default Rate" means the lesser of (i) Maximum Rate or, (ii) the sum of
the Prime Rate in effect from day to day plus five percent.

         "Dollars" and "$" mean lawful money of the United States of America.

         "EBITDA"  means as to any Person,  for any  period,  the sum of the Net
Income for such period plus (a)  interest  expense plus (b) cash taxes paid plus
(c) amortization, depreciation and other non-cash charges to the extent deducted
from Net Income in such period.

         "EBITDA Coverage Ratio" means, for any period,  the ratio of EBITDA for
such  period  minus  cash taxes paid  during  such  period to the sum of current
maturities  of long  term  Debt  and  interest  expense  for  such  period  plus
non-financed capital expenditures during such period.

         "Eligible  Accounts" means, at any time, all accounts receivable of the
Borrower  or a Guarantor  created in the  ordinary  course of business  that are
acceptable  to the  Lender in its sole  discretion  and  satisfy  the  following
conditions:

                  (a) The account complies with all applicable laws,  rules, and
         regulations,  including,  without  limitation,  usury laws, the Federal
         Truth in Lending Act, and Regulation Z of the Board of Governors of the
         Federal Reserve System;




                                        2

<PAGE>



                  (b) The account has not been outstanding for more than 90 days
         past the original date of invoice;

                  (c) The account was created in connection with (i) the sale of
         goods by the Borrower or a Guarantor in the ordinary course of business
         and such sale has been consummated and such goods have been shipped and
         delivered and received by the account  debtor,  or (ii) the performance
         of services by the Borrower or a Guarantor  in the  ordinary  course of
         business  and such  services  have been  completed  and accepted by the
         account debtor (and not the result of progress billing);

                  (d) The  account  arises  from an  enforceable  contract,  the
         performance of which has been completed by the Borrower or a Guarantor;

                  (e) The account  does not arise from the sale of any good that
         is  on  a  bill-andhold,   guaranteed  sale,  sale-or-return,  sale  on
         approval, consignment, or any other repurchase or return basis;

                  (f) The  Borrower  or a  Guarantor  has good and  indefeasible
         title to the  account and the account is not subject to any Lien except
         Liens in favor of the Lender;

                  (g) The account does not arise out of a contract with or order
         from an account  debtor that, by its terms,  prohibits or makes void or
         unenforceable  the grant of a security  interest  by the  Borrower or a
         Guarantor to the Lender in and to such account;

                  (h) The account is not  subject to any  setoff,  counterclaim,
         defense, dispute, recoupment, or adjustment other than normal discounts
         for prompt payment;

                  (i) The account  debtor is not insolvent or the subject of any
         bankruptcy or insolvency  proceeding and has not made an assignment for
         the  benefit  of  creditors,   suspended  normal  business  operations,
         dissolved,  liquidated,  terminated  its  existence,  ceased to pay its
         debts as they  become  due,  or  suffered a  receiver  or trustee to be
         appointed for any of its assets or affairs;

                  (j) The  account  is not  evidenced  by  chattel  paper  or an
         instrument;

                  (k) No default exists under the account by any party thereto;

                  (1) The account  debtor has not returned or refused to retain,
         or  otherwise  notified  the  Borrower  or a  Guarantor  of any dispute
         concerning, or claimed nonconformity of, any of the goods from the sale
         of which the account arose;

                  (m) The account is not owed by an Affiliate of the Borrower or
         a Guarantor;




                                        3

<PAGE>



                  (n) The  account is payable in Dollars by the  account  debtor
         (or in the case of Petroleos Mexicanos, Mexican pesos);

                  (o) The account shall be  ineligible if the account  debtor is
         domiciled in any country other than the United States of America unless
         the payment of such account is ensured by FCIA insurance;

                  (p)      Any "pass through" payments to third Persons;

                  (q) The account shall be ineligible if more than 25 percent of
         the  aggregate  balances  then  outstanding  on  accounts  owed by such
         account debtor and its Affiliates to the Borrower are more than 90 days
         past due from the dates of their original invoices;

                  (r) The account  shall be  ineligible if more than 15% (25% in
         the case of major energy companies  approved by the Lender, in its sole
         discretion,  in writing) of the aggregate  balance then outstanding for
         all  accounts  is owed by the  same  account  debtor  or any  Affiliate
         thereof; and

                  (s) The account shall be  ineligible if the account  debtor is
         the  United   States  of  America  or  any   department,   agency,   or
         instrumentality  thereof,  and the Federal  Assignment of Claims Act of
         1940, as amended, shall not have been complied with.

         The amount of the Eligible  Accounts  owed by an account  debtor to the
         Borrower  shall be reduced by the amount of all "contra  accounts"  and
         other obligations owed by the Borrower to such account debtor.

         "Environmental Laws" means any and all federal,  state, and local laws,
regulations,  and requirements pertaining to health, safety, or the environment,
including,   without  limitation,  the  Comprehensive   Environmental  Response,
Compensation and Liability Act of 1980, 42 U.S.C. ss. 9601 et seq., the Resource
Conservation  and  Recovery  Act of  1976,  42  U.S.C.  ss.  6901 et  seq.,  the
Occupational  Safety and Health  Act, 29 U.S.C.  ss. 651 et seq.,  the Clean Air
Act,  42 U.S.C.  ss. 7401 et seq.,  the Clean  Water Act, 33 U.S.C.  ss. 1251 et
seq., and the Toxic Substances  Control Act, 15 U.S.C. ss. 2601 et seq., as such
laws, regulations,  and requirements may be amended or supplemented from time to
time.

         "Environmental  Liabilities"  means, as to any Person, all liabilities,
obligations,  responsibilities,  Remedial  Actions,  losses,  damages,  punitive
damages, consequential damages, treble damages, costs, and expenses, (including,
without limitation,  all reasonable fees, disbursements and expenses of counsel,
expert and consulting fees and costs of investigation and feasibility  studies),
fines, penalties,  sanctions,  and interest incurred as a result of any claim or
demand,  by any Person,  whether  based in  contract,  tort,  implied or express
warranty,   strict   liability,   criminal  or  civil  statute,   including  any
Environmental Law, permit, order or agreement with any Governmental Authority or
other Person, arising from environmental, health or safety



                                        4

<PAGE>



conditions or the Release or threatened Release of a Hazardous Material into the
environment,  resulting  from the past,  present,  or future  operations of such
Person or its Affiliates.

         "Equipment" means the Property manufactured or distributed, or both, by
the  Manufacturer,  which Property  includes seismic data  acquisition  systems,
recording boxes, central processing units, cables and geophones.

         "ERISA" means the Employee  Retirement  Income Security Act of 1974, as
amended from time to time,  and the  regulations  and published  interpretations
thereunder.

         "ERISA Affiliate" means any corporation or trade or business which is a
member of the same  controlled  group of  corporations  (within  the  meaning of
Section 414(b) of the Code) as the Borrower or is under common  control  (within
the meaning of Section 414(c) of the Code) with the Borrower.

         "Event of Default"  has the meaning specified in Section 10.1.

         "Excess Cash Flow" means as to any Person,  for any  calendar  quarter,
the net increase in cash reflected in the Borrower's  Form 10-Q for such quarter
less (a) any increase  attributable to Debt permitted  under the Agreement,  (b)
any increase  resulting from  Revolving  Loan Advances,  (c) 35% of any increase
resulting from Geo's operations or the international operations of other foreign
Subsidiaries,  and (d) increases in cash that are Reserves (as such term is used
in the Lockbox Agreement).

         "GAAP" means generally  accepted  accounting  principles,  applied on a
consistent basis, as set forth in Opinions of the Accounting Principles Board of
the American  Institute of Certified Public  Accountants and/or in statements of
the Financial Accounting Standards Board and/or their respective  successors and
which are applicable in the circumstances as of the date in question. Accounting
principles are applied on a "consistent  basis" when the  accounting  principles
applied in a current  period are  comparable  in all material  respects to those
accounting principles applied in a preceding period.

         "Geo" means Geoevaluaciones S.A. de C.V.

         "Governmental  Authority" means any nation or government,  any state or
political subdivision thereof and any entity exercising executive,  legislative,
judicial,   regulatory,   or  administrative   functions  of  or  pertaining  to
government.

         "Guarantee"  by  any  Person  means  any   obligation,   contingent  or
otherwise,  of such Person directly or indirectly guaranteeing any Debt or other
liability or obligation of any other Person and, without limiting the generality
of the foregoing, any obligation,  direct or indirect,  contingent or otherwise,
of such  Person  (a) to  purchase  or pay (or  advance  or supply  funds for the
purchase or payment of) such Debt or other obligation (whether arising by virtue
of  partnership  arrangements,  by agreement to keep-well,  to purchase  assets,
goods, securities or



                                        5

<PAGE>



services,  to  take-or-pay,  or to maintain  financial  statement  conditions or
otherwise)  or (b) entered  into for the purpose of assuring in any other manner
the  obligee  of such Debt or other  obligation  of the  payment  thereof  or to
protect  the  obligee  against  loss in respect  thereof  (in whole or in part),
provided that the term Guarantee shall not include  endorsements  for collection
or deposit in the ordinary course of business.  The term  "Guarantee"  used as a
verb has a corresponding meaning.

         "Guarantors" means collectively  Paragon  Geophysical,  Inc.,  Northern
Geophysical of America, Inc. and Geo.

         "Guaranty" means collectively the guaranties of the Guarantors in favor
of the Lender, each in form and substance  acceptable to the Lender, as the same
may be amended, supplemented, or modified from time to time.

         "Hazardous Material" means any substance,  product,  waste,  pollutant,
material,  chemical,  contaminant,  constituent,  or other  material which is or
becomes listed,  regulated, or addressed under any Environmental Law, including,
without limitation, asbestos, petroleum, and polychlorinated biphenyls.

         "Leverage Ratio" means, for any period,  the ratio of total liabilities
(determined according to GAAP) to Tangible Net Worth.

         "Lien" means any lien, mortgage, security interest, tax lien, financing
statement, pledge, charge, hypothecation,  assignment,  preference, priority, or
other  encumbrance  of  any  kind  or  nature  whatsoever  (including,   without
limitation, any conditional sale or title retention agreement),  whether arising
by contract, operation of law, or otherwise.

         "Loan Documents" means this Agreement,  the Note, Security  Agreements,
Guaranties,   the  Remarketing  and  Support   Guaranty,   Lockbox   Agreements,
assignments,  guaranties,  and  other  instruments,  documents,  and  agreements
executed and delivered pursuant to or in connection with this Agreement, as such
instruments,  documents,  and  agreements  may be  amended,  modified,  renewed,
extended, or supplemented from time to time.

         "Lockbox"  means the post office box or boxes from time to time used by
the Lender or a third Person acting as Lender's  agent as a lockbox and to which
the Borrower or one or more  Guarantors,  or both, shall direct all payments and
monies due from any source.

         "Lockbox  Account"  means  one  or  more  segregated  deposit  accounts
established  in the name of Lender,  maintained  with  Lender or a third  Person
acting  as  Lender's  agent  and  into  which  certain  of  Borrower's  and  the
Guarantors' receivables will be deposited pursuant to the Lockbox Agreement.




                                        6

<PAGE>



         "Lockbox  Agreement" means the lockbox  agreements among Borrower,  the
Guarantors,  certain  others and  Lender or a third  Person  acting as  Lender's
agent,  in the form  acceptable  to all  parties,  as the  same may be  amended,
supplemented or be otherwise modified.

         "Manufacturer" means Input/Output, Inc., a Delaware corporation.

         "Material Adverse Effect" shall mean any material and adverse effect on
(i) the assets, liabilities, financial condition, business, operations, affairs,
or circumstances of a Person or one of its Subsidiaries  individually or of such
Person and its Subsidiaries on a consolidated  basis from those reflected in the
latest financial  statements delivered to the Lender prior to the date hereof or
from the facts  represented or warranted in this Agreement,  or any of the other
Loan  Documents  or  (ii)  the  ability  of an  Obligated  Party  or  any of its
Subsidiaries   individually  or  of  such  Person  and  its  Subsidiaries  on  a
consolidated basis to carry out its business as of the date of this Agreement or
as  proposed  at the  date  of  this  Agreement  to be  conducted  or  meet  its
obligations under the Notes, this Agreement,  or any of the other Loan Documents
on a timely basis.

         "Maximum  Rate" means,  at any time, the maximum rate of interest under
applicable  law that the Lender may charge the Borrower.  The Maximum Rate shall
be  calculated  in a manner that takes into account any and all fees,  payments,
and other  charges in respect of the Loan  Documents  that  constitute  interest
under applicable law. Each change in any interest rate provided for herein based
upon the Maximum  Rate  resulting  from a change in the Maximum  Rate shall take
effect  without notice to the Borrower at the time of such change in the Maximum
Rate.  For  purposes  of  determining  the  Maximum  Rate under  Texas law,  the
applicable  rate ceiling shall be the indicated  rate ceiling  described in, and
computed in accordance with, Article 5069-1.04, Vernon's Texas Civil Statutes.

         "Monthly  Payment  Date" means the last day of each  calendar  month of
each year, the first of which shall be June 30, 1996.

         "Multiemployer  Plan"  means a  multiemployer  plan  defined as such in
Section 3(37) of ERISA to which  contributions have been made by the Borrower or
any ERISA Affiliate and which is covered by Title IV of ERISA.

         "Net Income" means, for any period, a Person's  consolidated net income
(or loss) after income and franchise  taxes  determined in conformity with GAAP,
but excluding:  (a) the income of any other Person (other than the Subsidiaries)
in which  such  Person or any of its  Subsidiaries  has an  ownership  interest,
unless and except to the extent received by such Person or its Subsidiaries in a
cash  distribution;  and (b) to the extent not included in clause (a) above, any
after tax extraordinary noncash gains or extraordinary noncash losses.

         "Notes"  means  the  Revolving  Credit  Note and the Term  Note and all
extensions, renewals and modifications thereof.




                                        7

<PAGE>



         "Obligated  Party" means each  Guarantor and any other Person who is or
becomes  party  to  any  agreement  that   guarantees  or  secures  payment  and
performance  of Obligations or any part thereof and, in the case of clauses (b),
(c), (d) and (e) of Section 10.1 of the Agreement.

         "Obligations" means all obligations,  indebtedness,  and liabilities of
the Borrower to the Lender, now existing or hereafter  arising,  whether direct,
indirect,  related,  unrelated,  fixed,  contingent,  liquidated,  unliquidated,
joint,  several,  or joint  and  several,  including,  without  limitation,  the
obligations, indebtedness, and liabilities of the Borrower or the Guarantors, or
both,  under this  Agreement  and the other  Loan  Documents,  and all  interest
accruing  thereon and all  attorneys'  fees and other  expenses  incurred in the
enforcement or collection thereof.

         "Operating  Lease" means any lease (other than a lease  constituting  a
Capital Lease Obligation) of real or personal property.

         "PBGC" means the Pension  Benefit  Guaranty  Corporation  or any entity
succeeding to all or any of its functions under ERISA.

         "Permitted Lien" has the meaning specified in Section 8.2 hereof.

         "Person"   means   any   individual,   corporation,   business   trust,
association,  company,  partnership,  joint venture,  Governmental Authority, or
other entity.

         "Plan"  means  any  employee  benefit  or  other  plan  established  or
maintained by the Borrower or any ERISA  Affiliate and which is covered by Title
IV of ERISA.

         "Prime  Rate" means,  at any time,  the rate of interest per annum then
most recently established by the Lender as its prime rate, which rate may not be
the lowest rate of interest charged by the Lender to its borrowers.  Each change
in any interest  rate  provided  for herein based upon the Prime Rate  resulting
from a change in the Prime Rate shall take effect without notice to the Borrower
at the time of such change in the Prime Rate.

         "Principal Office" means the principal office of the Lender,  presently
located at 1000 Louisiana, Houston, Texas.

         "Prohibited Transaction" means any transaction set forth in Section 406
of ERISA or Section 4975 of the Code.

         "Quarterly  Payment  Date"  means  the  last day of each  May,  August,
November  and  February of each year,  the first of which shall be November  30,
1996.

         "Release"  means,  as to any  Person,  any  release,  spill,  emission,
leaking,  pumping,  injection,  deposit,  disposal,  disbursement,  leaching, or
migration of Hazardous  Materials into the indoor or outdoor environment or into
or out of property owned by such Person, including,



                                        8

<PAGE>



without  limitation,  the movement of Hazardous Materials through or in the air,
soil, surface water, ground water, or property.

         "Remarketing  and  Support  Agreement"  means  an  agreement  from  the
Manufacturer of a portion of the Term Note, in form and substance  acceptable to
the Lender,  as the same may be amended,  modified or supplemented  from time to
time.

         "Remedial  Action" means all actions  required to (a) clean up, remove,
treat,  or  otherwise  address  Hazardous  Materials  in the  indoor or  outdoor
environment,  (b)  prevent  the  Release or threat of Release  or  minimize  the
further  Release of Hazardous  Materials so that they do not migrate or endanger
or  threaten  to  endanger  public  health or  welfare  or the indoor or outdoor
environment,   or  (c)  perform  pre-remedial  studies  and  investigations  and
post-remedial monitoring and care.

         "Reportable Event" means any of the events set forth in Section 4043 of
ERISA.

         "Representations  and Warranties  Certificate" shall mean a certificate
in form and substance satisfactory to the Lender.

         "Revolving  Credit  Advance" means an advance of funds by the Lender to
the  Borrower  pursuant to Article II;  "Revolving  Credit  Advances"  means all
advances of funds by the Lender to the Borrower pursuant to Article II.

         "Revolving  Credit Advance  Request Form" means a  certificate,  in the
form satisfactory to the Lender in its sole discretion,  properly  completed and
signed by the Borrower requesting a Revolving Credit Advance.

         "Revolving  Credit  Commitment"  means the obligation of Lender to make
the  Revolving  Credit Loan to Borrower  in multiple  advances in the  aggregate
principal amount of $3,000,000.

         "Revolving  Credit  Loan" the  revolving  credit loan  described in the
Recitals hereto and made or to be made to Borrower pursuant to Article II.

         "Revolving  Credit Note" means the promissory note of Borrower  payable
to the order of Lender in substantially the form of Exhibit "A" attached hereto,
and all extensions, renewals and modifications thereof.

         "Revolving  Credit Loan  Termination  Date" means 11:00 a.m.,  Houston,
Texas  time on May 29,  1997,  or such  earlier  date on  which  the  Term  Loan
Commitment terminates as provided in this Agreement.

         "RICO" means the Racketeer  Influenced and Corrupt  Organization Act of
1970, as amended from time to time.




                                        9

<PAGE>



         "Security Agreement" means a security agreement or other Lien agreement
(including in the case of Geo,  appropriate  documentation under the laws of the
Republic of Mexico) in favor of the Lender in form and substance satisfactory to
Lender, as the same may be amended, supplemented, or modified.

         "Subordinated  Debt" means indebtedness of a Person that by the express
terms of the  instrument  creating  the  same,  or by the  terms  of a  separate
subordination agreement, is validly and effectively made subordinate and subject
in right of payment,  to whatever  extent Lender may require,  to payment of the
Obligations, the form and substance of such instrument or agreement, as the case
may be, to be satisfactory to Lender.

         "Subsidiary"  means any corporation of which at least a majority of the
outstanding shares of stock having by the terms thereof ordinary voting power to
elect a majority of the board of directors of such corporation  (irrespective of
whether  or not at the  time  stock  of any  other  class  or  classes  of  such
corporation  shall have or might have voting power by reason of the happening of
any  contingency)  is at the time directly or indirectly  owned or controlled by
Borrower or one or more of the  Subsidiaries  or by Borrower  and one or more of
the Subsidiaries.

         "Tangible Net Worth" means, at any particular  time, all amounts which,
in  conformity  with  GAAP,  would be  included  as  stockholders'  equity  on a
consolidated  balance sheet of the Borrower;  provided,  there shall be included
therein Subordinated Debt of the Borrower,  and provided further, there shall be
excluded  therefrom:  (a) any  amount at which  shares of  capital  stock of the
Borrower  appear as an asset on the  Borrower's  balance  sheet,  (b)  goodwill,
including  any amounts,  however  designated,  that  represent the excess of the
purchase  price paid for assets or stock over the value  assigned  thereto,  (c)
patents,  trademarks,  trade names, and copyrights,  (d) deferred expenses,  (e)
loans and advances to any  stockholder,  director,  officer,  or employee of the
Borrower or any  Affiliate of the  Borrower,  and (f) all other assets which are
properly  classified  as  intangible  assets with the  exception of  capitalized
non-exclusive   seismic  data  costs,   and  (g)  cumulative   foreign  currency
transaction adjustment (plus or minus) resulting from the operations of Geo.

         "Term Loan" means the term loan  described in the  Recitals  hereto and
made or to be made to Borrower pursuant to Article III.

         "Term  Loan  Advance"  means an  advance  of funds by the Lender to the
Borrower  pursuant to Article III;  "Term Loan  Advances"  means all advances of
funds by the Lender to the Borrower pursuant to Article III.

         "Term Loan Commitment"  means the obligation of Lender to make the Loan
to  Borrower  in  multiple  advances  in  the  aggregate   principal  amount  of
$15,000,000.

         "Term Loan  Advance  Request  Form"  means a  certificate,  in the form
satisfactory to the Agent in its sole discretion,  properly completed and signed
by the Borrowers requesting a Term Loan Advance.



                                       10

<PAGE>




         "Term Note" means the promissory note of Borrower  payable to the order
of Lender in  substantially  the form of Exhibit "B"  attached  hereto,  and all
extensions, renewals and modifications thereof.

         "Term Loan Maturity Date" means 11:00 a.m., Houston,  Texas time on the
date that is three years after the earlier of (a) last Term Loan  Advance or (b)
the Term Loan Termination  Date, or such earlier date and time on which the Term
Note matures as provided in this Agreement.

         "Term Loan Termination Date" means 11:00 a.m.,  Houston,  Texas time on
March 31, 1997 or such earlier date on which the Term Loan Commitment terminates
as provided in this Agreement.

         "Total Liabilities" means total liabilities (as such term is used under
GAAP) of a Person less Subordinated Debt.

         "UCC"  means the Uniform  Commercial  Code as in effect in the State of
Texas.

         "Vessel" has the meaning assigned to it in the Security Agreements.




                                       11

<PAGE>



Schedules 8.1 and 8.2 (also called Schedule 1)






                                       12

<PAGE>



                                  Schedule 8.3

         The Borrower is currently reviewing a potential  acquisition of another
seismic contractor. As consideration for this acquisition,  the Borrower intends
to issue up to 600,000 shares of common stock, or its equivalents, and assume up
to $2.0 million in debt.





                                                        13

<PAGE>



                                  Schedule 8.4

                              Restricted Agreements

A.       The  Borrower  has $1.0  million  debt plus 8% interest  payable to the
         former  owners  of  its  Mexican   subsidiary.   Payments  are  due  on
         semi-annually  for the  next  two  years.  See  "Certain  Transactions"
         section of Borrower's Prospectus dated February 6, 1996.

B.       The Borrower has $1.0 million of  restricted  cash on its balance sheet
         statement,  which is offset by a long-term  liability of $1.0  million.
         This  $1.0  million  is  payable  to  the  former  shareholders  of the
         Borrower's Mexican subsidiary after two years and will be offset by any
         undisclosed  liabilities  including  payments related to a disagreement
         with  Capilano  International,  Inc.  See  "Certain  Transactions"  and
         "Business-Legal  Proceedings"  sections of Borrower's  Prospectus dated
         February 6, 1996.





                                       14

<PAGE>



Schedule 8.6
Permitted Issuances of Capital Stock



                   3-D Geophysical, Inc. Stock Option Summary



                                                Qualified      Non-Qualified

Options Authorized                              725,000                N/A

Options Issued at May 1, 1995                   639,502            225,000

Options Pending Issuance                         12,000                -0-
                                                -------            -------

Options Remaining Available for Distribution     73,498                N/A



Note:    The company is currently  contemplating a transaction  that may involve
         the issuance of up to 600,000 shares of stock.

                                       15


<PAGE>



                                   EXHIBIT "A"

                              REVOLVING CREDIT NOTE
                              ---------------------

$3,000,000.00                     Houston, Texas                    May 29, 1996


         FOR VALUE RECEIVED, the undersigned, 3-D GEOPHYSICAL,  INC., a Delaware
corporation  ("Maker"),  hereby promises to pay to the order of FIRST INTERSTATE
BANK OF TEXAS, N.A., a national banking association ("Payee"), at its offices at
1000  Louisiana,  Houston,  Harris County,  Texas, in lawful money of the United
States of  America,  the  principal  sum of THREE  MILLION  AND  NO/100  DOLLARS
($3,000,000.00),  or  so  much  thereof  as  may  be  advanced  and  outstanding
hereunder,  together with interest on the outstanding principal balance from day
to day remaining. This Note shall be due and payable as follows:

               (a)      Accrued  and  unpaid  interest  on this  Note  shall  be
                        payable  on  each  Monthly   Payment  Date  and  on  the
                        Revolving Credit Termination Date; and

               (b)      A final  installment  in the amount of the entire unpaid
                        principal  balance  hereof,  plus all accrued and unpaid
                        interest  hereon,  shall  be  due  and  payable  on  the
                        Revolving Credit Termination Date.

     This  Revolving  Credit Note provided for in that certain Loan Agreement of
even date herewith  between Maker and Payee (such Loan Agreement as the same may
be amended,  supplemented or otherwise modified from time to time is hereinafter
referred to as the "Agreement").  Capitalized terms not otherwise defined herein
shall have the same meanings except forth in the Agreement.  Reference is hereby
made to the Agreement  for  provisions  affecting  this  Revolving  Credit Note,
including,  without limitation,  provisions regarding the limitation of interest
charged hereunder,  the Collateral securing this Revolving Credit Note, optional
and mandatory  prepayments,  Defaults and Payee's  rights arising as a result of
the occurrence thereof.

     Subject to the terms of the Agreement,  the outstanding  principal  balance
hereof shall bear interest prior to maturity at a varying rate (which shall from
day to day be equal to the lesser of (a) the Maximum Rate, or (b) the Applicable
Rate,  each such  change in the rate of  interest  charged  hereunder  to become
effective  without notice to Maker,  on the effective date of each change in the
Applicable Rate or the Maximum Rate, as the case may be; provided,  however,  if
at any time the rate of interest  specified in clause (b) preceding shall exceed
the Maximum Rate thereby  causing the interest  rate hereon to be limited to the
Maximum Rate,  than any  subsequent  reduction in the  Applicable  Rate will not
reduce the rate of interest hereon below the Maximum Rate until the total amount
of  interest  accrued  hereon  equals the amount of  interest  which  would have
accrued  hereon if the rate  specified in clause (b)  preceding had at all times
been in effect.  Past due  principal  and  interest  shall bear  interest at the
Default Rate.

                                       A-1


<PAGE>




         Interest on the  indebtedness  evidenced by this Note shall be computed
on the  basis  of a year of 365  days  and the  actual  number  of days  elapsed
(including  the first day but  excluding  the last day) unless such  calculation
would result in a usurious  rate, in which case interest  shall be calculated on
the basis of a year of 365 or 366 days, as the case may be.

         If the  holder  hereof  expends  any  effort in any  attempt to enforce
payment of all or any part or installment  of any sum due the holder  hereunder,
or if this Note is placed in the hands of an attorney for  collection,  or if it
is  collected  through  any legal  proceedings,  Maker  agrees to pay all costs,
expenses, and fees incurred by the holder, including reasonable attorneys' fees.

         This Note 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 Note is performable in Harris County, Texas.

         Maker and each surety, guarantor, endorser, and other party ever liable
for  payment of any sums of money  payable on this Note  jointly  and  severally
waive notice,  presentment,  demand for payment,  protest, notice of protest and
non-payment or dishonor, notice of acceleration, notice of intent to accelerate,
notice  of intent to  demand,  diligence  in  collecting,  grace,  and all other
formalities of any kind,  and consent to all  extensions  without notice for any
period or periods of time and partial  payments,  before or after maturity,  and
any  impairment of any collateral  securing this Note, all without  prejudice to
the holder. The holder shall similarly have the right to deal in any way, at any
time,  with one or more of the  foregoing  parties  without  notice to any other
party,  and to grant any such party any extensions of time for payment of any of
said  indebtedness,  or to release or substitute  part or all of the  collateral
securing  this  Note,  or  to  grant  any  other   indulgences  or  forbearances
whatsoever,  without  notice to any other party and without in any way affecting
the personal liability of any party hereunder.


                                       3-D GEOPHYSICAL, INC.



                                       By:___________________________________
                                                J.D. White, Secretary

                                       A-2


<PAGE>



                                   EXHIBIT "B"

                                    TERM NOTE

$15,000,000.00                     Houston, Texas                   May 29, 1996


         FOR VALUE RECEIVED, the undersigned, 3-D GEOPHYSICAL,  INC., a Delaware
corporation  ("Maker"),  hereby promises to pay to the order of FIRST INTERSTATE
BANK OF TEXAS, N.A., a national banking association ("Payee"), at its offices at
1000  Louisiana,  Houston,  Harris County,  Texas, in lawful money of the United
States of America,  the  principal  sum of FIFTEEN  MILLION  AND NO/100  DOLLARS
($15,000,000.00),  or so  much  thereof  as  may  be  advanced  and  outstanding
hereunder,  together with interest on the outstanding principal balance from day
to day  remaining  as herein  specified.  This Note shall be due and  payable as
follows:

                  (a) On even date herewith, $12,051,311.20 is being advanced by
         the Payee to the Maker (the "Initial Advance").  Principal and interest
         on the Initial Advance will be repaid as follows:

                           (i) Interest only will be paid on the Initial Advance
                  on June 30, 1996 and on July 31, 1996.

                           (ii)  Thereafter,   principal  and  interest  on  the
                  Initial  Advance is due and  payable in 36  installments,  the
                  first 35 of which being in the principal amount of $334,758.64
                  (or  such  lesser  amount  as may  then be  outstanding)  plus
                  accrued interest each, and the final  installment being in the
                  amount of the  balance  of  principal  and  interest  then due
                  thereon.  The first such installment of principal and interest
                  is due and  payable  on August  31,  1996,  and the  remaining
                  installments  are due and payable in consecutive  order on the
                  last  day  of  each  and  every   succeeding   calendar  month
                  thereafter  until all sums called for hereunder  applicable to
                  the Initial  Advance have been paid in full,  with maturity of
                  the final  installment  of the Initial  Advance being July 31,
                  1999.

                  (b) All or  part of the  remaining  principal  to be  advanced
         hereunder  shall be  advanced  only in  accordance  with the  terms and
         provisions of the Agreement (as hereinafter defined), all of which must
         be done in a single  advance  prior  to March  31,  1997  (the  "Second
         Advance").  The Second  Advance shall be repayable in 36  substantially
         equal monthly  installments of principal,  plus accrued  interest each,
         commencing  after the Second  Advance  on the same day of the  calendar
         month that the next  installment of the Initial  Advance is due (and if
         Initial  Advance  has been  paid in  full,  then on the last day of the
         month  in  which  the  Second  Advance  is  made),  and  the  remaining
         installments  are due and payable in consecutive  order on the same day
         of  each  and  every  calendar  month  thereafter  unless  there  is no
         numerically corresponding day of

                                       B-1


<PAGE>



         the month (in which case  payment  shall be made on the last day of the
         month),  with the  first 35  installments  being in the  amount  of the
         Second  Advance  divided by 36, plus accrued  interest  each,  with the
         final  installment in the amount of the unpaid  principal  balance then
         owing  hereunder  applicable to the Second  Advance being payable on or
         before the same day of the month,  35 months  subsequent to the date on
         which the first installment payment is due for the Second Advance.

                  (c) In addition  to the  aforesaid  installments,  Maker shall
         make Excess Cash Flow payments  toward payment of this Note as required
         by the  Agreement,  which  payments  shall be applied to the payment of
         installments of principal in the inverse order of maturity.

     This is the Term Note provided for in that certain Loan Agreement  dated of
even date herewith  between Maker and Payee (such Loan Agreement as the same may
be amended,  supplemented or otherwise modified from time to time is hereinafter
referred to as the "Agreement").  Capitalized terms not otherwise defined herein
shall have the same meanings as set forth in the Agreement.  Reference is hereby
made to the Agreement for  provisions  affecting this Note,  including,  without
limitation,  provisions  regarding the limitation of interest charged hereunder,
the  Collateral  securing this Term Note,  optional and  mandatory  prepayments,
Defaults and Payee's rights arising as a result of the occurrence thereof.

     Subject to the terms of the Agreement,  the outstanding  principal  balance
hereof shall bear  interest  prior to maturity at a varying rate per annum which
shall from day to day be equal to the lesser of (a) the Maximum Rate, or (b) the
Prime Rate of Payee in effect from day to day plus one percent, each such change
in the rate of interest charged hereunder to become effective, without notice to
Maker,  on the  effective  date of each  change in the Prime Rate or the Maximum
Rate, as the case may be; provided, however, if at any time the rate of interest
specified in clause (b) preceding shall exceed the Maximum Rate, thereby causing
the interest rate hereon to be limited to the Maximum Rate,  then any subsequent
reduction  in the Prime Rate will not reduce the rate of interest  hereon  below
the Maximum Rate until the total amount of interest  accrued  hereon  equals the
amount of interest  which would have  accrued  hereon if the rate  specified  in
clause (b) preceding had at all times been in effect. All past due principal and
interest shall bear interest at the Default Rate.

     Interest on the  indebtedness  evidenced  by this Note shall be computed on
the basis of a year of 365 days and the actual number of days elapsed (including
the first day but excluding the last day) unless such  calculation  would result
in a usurious rate, in which case interest shall be calculated on the basis of a
year of 365 or 366 days, as the case may be.

         If the  holder  hereof  expends  any  effort in any  attempt to enforce
payment of all or any part or installment  of any sum due the holder  hereunder,
or if this Note is placed in the hands of an attorney for  collection,  or if it
is collected through any legal  proceedings,  Maker agrees to pay all collection
costs and fees incurred by the holder, including reasonable attorneys' fees.

                                       B-2


<PAGE>



     This Note 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
Note is performable in Harris County, Texas.

         Maker and each surety, guarantor, endorser, and other party ever liable
for  payment of any sums of money  payable on this Note  jointly  and  severally
waive notice,  presentment,  demand for payment,  protest, notice of protest and
non-payment or dishonor, notice of acceleration, notice of intent to accelerate,
notice  of intent to  demand,  diligence  in  collecting,  grace,  and all other
formalities of any kind,  and consent to all  extensions  without notice for any
period or periods of time and partial  payments,  before or after maturity,  and
any  impairment of any collateral  securing this Note, all without  prejudice to
the holder. The holder shall similarly have the right to deal in any way, at any
time,  with one or more of the  foregoing  parties  without  notice to any other
party,  and to grant any such party any extensions of time for payment of any of
said  indebtedness,  or to release or substitute  part or all of the  collateral
securing  this  Note,  or  to  grant  any  other   indulgences  or  forbearances
whatsoever,  without  notice to any other party and without in any way affecting
the personal liability of any party hereunder.



                                       3-D GEOPHYSICAL, INC.



                                       By:___________________________________
                                                J.D. White, Secretary

                                       B-3


<PAGE>



                                   EXHIBIT "C"

                              BORROWING BASE REPORT


TO:      FIRST INTERSTATE BANK OF TEXAS, N.A.
         1000 Louisiana
         Houston, Texas 77002
         Attention: Randy Wade

Gentlemen:

         This Borrowing Base Report for the month ending ____________,  19__, is
executed and delivered by 3-D INTERNATIONAL (the "Borrower") to FIRST INTERSTATE
BANK OF TEXAS,  N.A.  ("Lender")  under that certain Loan  Agreement  (the "Loan
Agreement") dated May 29, 1996,  between the Borrower and the Lender.  All terms
used herein shall have the meanings assigned to them in the Loan Agreement.

         The Borrower represents and warrants to the Lender that all information
contained  herein is true,  correct,  and complete,  and that the total Eligible
Accounts  referred to below  represent  the Eligible  Accounts  that qualify for
purposes  of  determining  the  Borrowing  Base  under the Loan  Agreement.  The
Borrower  further  represents and warrants to the Lender that attached hereto as
Schedule 1 is a list of the Eligible Accounts for the month ending ____________,
19__, showing all Eligible Accounts aged in 30-day intervals.

================================================================================
           ACCOUNTS RECEIVABLE OF THE BORROWER AND GUARANTORS:
- --------------------------------------------------------------------------------
a.       Gross  Accounts  Receivable  -- ending  balance for          $ 
         period ended  _________________, 19_____
- --------------------------------------------------------------------------------
b.       Less:  Ineligible Accounts  (determined pursuant to          $ 
         the  definition of  Eligible  Accounts in the Loan
         Agreement, without duplication)
- --------------------------------------------------------------------------------
              Accounts not complying with applicable law              $
- --------------------------------------------------------------------------------
              Accounts  outstanding  for  more  than 90 days          $ 
              past the original due date
- --------------------------------------------------------------------------------
              More than 25% of the  balance of such  portion          $ 
              of the account  has been outstanding for more
              than 90 days past the original date of invoice
- --------------------------------------------------------------------------------
              Accounts   created  outside  of  the  ordinary
              course of business                                      $
- --------------------------------------------------------------------------------
              Accounts  from   unenforceable   contracts  or          $
              contracts   not  fully    completed   by  the
              Borrowers or the Guarantors

                                       C-1


<PAGE>





- --------------------------------------------------------------------------------
              Accounts   from   sales   on    bill-and-hold,          $
              guaranteed  sale,   sale-and-return,   or
              similar basis
- --------------------------------------------------------------------------------
              Accounts  subject  to a Lien  other than Liens          $ 
              held by the Lender
- --------------------------------------------------------------------------------
              Accounts   as  to  which  a  Borrower  or  the          $ 
              Guarantors   does   not     have   good   and
              indefeasible title

- --------------------------------------------------------------------------------
              Accounts  in which the Lender  does not have a          $ 
              perfected first  priority Lien
- --------------------------------------------------------------------------------
              Accounts subject to anti-assignment provisions          $ 
- --------------------------------------------------------------------------------
              Accounts subject to set-off, dispute, etc.              $         
- --------------------------------------------------------------------------------
              Accounts  owed by account  debtors  subject to          $ 
              bankruptcy,   insolvency,   receivership,   or
              liquidation proceedings
- --------------------------------------------------------------------------------
              Accounts   evidenced   by  chattel   paper  or          $ 
              instruments
- --------------------------------------------------------------------------------
              Accounts  subject  to a  default  by any party          $ 
              thereto
- --------------------------------------------------------------------------------
              Accounts owed by Affiliates of the Borrower or          $ 
              a Guarantor
- --------------------------------------------------------------------------------
              Accounts  not  payable in  Dollars  (excluding          $ 
              Petroleos Mexicanos accounts insured by FCIA)
- --------------------------------------------------------------------------------
              Accounts owed by foreign account debtors - not          $ 
              insured by FCIA
- --------------------------------------------------------------------------------
              Such  portion of  accounts  representing  more          $ 
              than 10 percent of the aggregate amount of all
              accounts receivable
- --------------------------------------------------------------------------------
              Accounts  owed by the United States of America          $ 
              or any agency  thereof  for which the  Federal
              Assignment  of Claims Act of 1940, as amended,
              has not been complied with
- --------------------------------------------------------------------------------
              Contra accounts owed to the account debtor              $ 
- --------------------------------------------------------------------------------
c.       Total Ineligible Accounts                                    $         
- --------------------------------------------------------------------------------
d.       Total Eligible Accounts                                      $         
- --------------------------------------------------------------------------------
BORROWING BASE:
- --------------------------------------------------------------------------------
e.       70% of line d ("Borrowing Base")                             $         
- --------------------------------------------------------------------------------
f.       Outstanding  Principal  Amount  of  Advances  under          $ 
         Revolving $ Credit Commitment

                                       C-2


<PAGE>





- --------------------------------------------------------------------------------
g.       Available  Credit Amount [(the lesser of the amount          $ 
         of the $  Revolving  Credit  Commitment  or line d)
         minus line f]
================================================================================

         The  Borrower  further  represents  and warrants to the Lender that the
representations  and warranties  contained in the Agreement are true and correct
on and as of the date of this  Borrowing Base Report as if made on and as of the
date hereof, and that no Default has occurred and is continuing.

Date: ______________________, 19__


                                            BORROWER:

                                            3-D INTERNATIONAL, INC.


                                            By:_________________________________
                                                        Authorized Officer

                                       C-3


<PAGE>



                                TABLE OF CONTENTS

                                                                            PAGE

R E C I T A L S.............................................................  1

ARTICLE I         Definitions...............................................  1
         Section 1.1       Definitions......................................  1
         Section 1.2       Other Definitional Provisions....................  1

ARTICLE II        Revolving Credit Loan.....................................  2
         Section 2.1       Revolving Credit Commitment......................  2
         Section 2.2       Revolving Credit Note............................  2
         Section 2.3       Repayment of Revolving Credit Loan...............  2
         Section 2.4       Interest.........................................  2
         Section 2.5       Borrowing Procedure..............................  2
         Section 2.6       Use of Proceeds..................................  3
         Section 2.7       Borrowing Base; Mandatory Prepayments............  3
         Section 2.8       Revolving Credit Commitment Fee..................  3
         Section 2.9       Reduction or Termination of Revolving 
                           Credit Commitment................................  3

ARTICLE III       Term Loan.................................................  3
         Section 3.1       Term Loan Commitment.............................  3
         Section 3.2       The Term Note....................................  4
         Section 3.3       Repayment of Term Loan...........................  4
         Section  3.4      Interest.........................................  4
         Section 3.5       Borrowing Procedure, Etc.........................  4
         Section 3.6       Facility Fee.....................................  4
         Section 3.7       Use of Proceeds..................................  4
         Section 3.8       Mandatory Prepayment.............................  4
         Section 3.9       Voluntary Prepayment and Repayment...............  5

ARTICLE IV    Payments......................................................  5
         Section 4.1       Method of Payment................................  5
         Section 4.2       Computation of Interest..........................  5
         Section 4.3       Interest at Default Rate.........................  5
         Section 4.4       Capital Adequacy.................................  5
         Section 4.5       Annual Agent Fee.................................  6

ARTICLE V         Security..................................................  6
         Section 5.1       Collateral.......................................  6
         Section 5.2       Guaranties.......................................  7
         Section 5.3       Additional Support...............................  7
         Section 5.4       Setoff...........................................  7



                                        i

<PAGE>


                                TABLE OF CONTENTS
                                   (continued)

                                                                            PAGE




ARTICLE VI    Conditions Precedent..........................................  7
         Section 6.1       Initial Term Loan Advance........................  7
         Section 6.2       Initial Revolving Credit Advance................. 10
         Section 6.3       Conditions to All Advances....................... 11

ARTICLE VII    Positive Covenants........................................... 11
         Section 7.1       Reporting Requirements........................... 11
         Section 7.2       Maintenance of Existence; Conduct of Business.... 14
         Section 7.3       Maintenance of Properties........................ 14
         Section 7.4       Taxes and Claims................................. 14
         Section 7.5       Insurance........................................ 14
         Section 7.6       Inspection Rights................................ 14
         Section 7.7       Keeping Books and Records........................ 15
         Section 7.8       Compliance with Laws............................. 15
         Section 7.9       Compliance with Agreements....................... 15
         Section 7.10      Comply with Vessel Charters and Leases........... 15
         Section 7.11      Vendors, Suppliers, Etc.......................... 15
         Section 7.12      Further Assurances............................... 15
         Section 7.13      ERISA............................................ 15
         Section 7.14      Annual Collateral and Systems Review............. 15
         Section 7.15      Lockbox.......................................... 16

ARTICLE VIII    Negative Covenants.......................................... 16
         Section 8.1       Debt............................................. 16
         Section 8.2       Limitation on Liens.............................. 16
         Section 8.3       Mergers, Etc..................................... 17
         Section 8.4       Restricted Payments.............................. 17
         Section 8.5       Loans and Investments............................ 17
         Section 8.6       Limitation on Issuance of Capital Stock.......... 18
         Section 8.7       Transactions With Affiliates..................... 18
         Section 8.8       Disposition of Assets............................ 18
         Section 8.9       Sale and Leaseback............................... 18
         Section 8.10      Prepayment of Debt............................... 18
         Section 8.11      Nature of Business............................... 18
         Section 8.12      Environmental Protection......................... 18
         Section 8.13      Accounting....................................... 19




                                       ii

<PAGE>


                                TABLE OF CONTENTS
                                   (continued)

                                                                            PAGE



ARTICLE IX     Financial Covenants.......................................... 19
         Section 9.1       EBITDA Coverage Ratio............................ 19
         Section 9.2       Consolidated Tangible Net Worth.................. 19
         Section 9.3       Leverage Ratio................................... 19

ARTICLE X         Default................................................... 19
         Section 10.1      Events of Default................................ 19
         Section 10.2      Remedies Upon Default............................ 21
         Section 10.3      Performance by the Lender........................ 22

ARTICLE XI   Miscellaneous.................................................. 22
         Section 11.1  Expenses............................................. 22
         Section 11.2  Indemnification...................................... 22
         Section 11.3  Limitation of Liability.............................. 23
         Section 11.4  Lender Not Manufacturer; Disclaimer.................. 24
         Section 11.5  No Defenses.......................................... 24
         Section 11.6  No Duty.............................................. 24
         Section 11.7  Lender Not Fiduciary................................. 25
         Section 11.8  No Waiver; Cumulative Remedies....................... 25
         Section 11.9  Successors and Assigns............................... 25
         Section 11.10  Survival............................................ 25
         Section 11.11  Entire Agreement; Amendment......................... 25
         Section 11.12  Maximum Interest Rate............................... 25
         Section 11.13  Notices............................................. 26
         Section 11.14  Governing Law; Venue; Service of Process............ 26
         Section 11.15  Counterparts........................................ 27
         Section 11.16  Severability........................................ 27
         Section 11.17  Headings............................................ 27
         Section 11.18  Non-Application of Chapter 15 of Texas 
                        Credit Code......................................... 27
         Section 11.19  Participations...................................... 27
         Section 11.20  Construction........................................ 27
         Section 11.21  Independence of Covenants........................... 27
         Section 11.22  DTPA Waiver......................................... 28
         Section 11.23  Arbitration Program................................. 28






                                       iii


                               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




<PAGE>



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:



                                       -2-




<PAGE>



         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.


                                       -3-




<PAGE>



         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-




<PAGE>



          (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-




<PAGE>



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-




<PAGE>




         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

                                       -7-




<PAGE>



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;

                                       -8-




<PAGE>




              (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

                                       -9-




<PAGE>



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-




<PAGE>



         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-




<PAGE>




                                   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-




<PAGE>



         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-




<PAGE>



         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


                                      -14-

                               SECURITY AGREEMENT


         THIS  SECURITY  AGREEMENT  dated as of May 29, 1996,  is by and between
NORTHERN GEOPHYSICAL OF AMERICA, INC., a Delaware corporation,  whose address is
set forth on its  signature  page hereto,  and FIRST  INTERSTATE  BANK OF TEXAS,
N.A., a national  banking  association (the "Secured  Party"),  whose address is
1000 Louisiana, Houston, Texas 77002.

                                R E C I T A L S:

         A. 3-D Geophysical,  Inc., a Delaware corporation (the "Borrower"), and
the Secured  Party have entered  into that  certain Loan  Agreement 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 to Borrower (i) a revolving  credit loan
in the aggregate  principal amount not to exceed  $3,000,000.00  and (ii) a term
loan in the aggregate principal amount not to exceed $15,000,000.00,  subject to
the  terms and  conditions  of the Loan  Agreement.  Terms  defined  in the Loan
Agreement and not otherwise defined herein being used as defined therein).

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






<PAGE>



                                   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 2.2.  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.


                                      - 2 -




<PAGE>



                                   ARTICLE III

                         Representations and Warranties

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

         Section  3.1.  Title.  The Debtor is,  and with  respect to  Collateral
acquired  after the date  hereof  the Debtor  will be, the legal and  beneficial
owner of the Collateral free and clear of any Lien, security interest,  or other
encumbrance.

         Section 3.2.  Accounts.  Unless the Debtor has given the Secured  Party
written notice to the contrary, whenever the security interest granted hereunder
attaches  to an  account,  the Debtor  shall be deemed to have  represented  and
warranted to the Secured  Party as to each and all of its accounts that (a) each
account is genuine and in all respects  what it purports to be, (b) 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 the Debtor or the sale or lease of goods
by the  Debtor,  (c) 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 (d) 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 the
Secured Party pursuant to this Agreement.

         Section  3.4.  Principal  Place of  Business.  The  principal  place of
business  and chief  executive  office of the Debtor,  and the office  where the
Debtor  keeps its books and  records,  is located  at the  address of the Debtor
shown at the beginning of this Agreement.

         Section 3.5. Location of Collateral;  Marking.  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  Collateral  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.

         Section 3.6.  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.

                                      - 3 -




<PAGE>




         Section 3.7.  Inventory.  All inventory has been produced in compliance
with all requirements of the Fair Labor Standards Act.

         Section 3.8. Independent  Investigation.  The Debtor has, independently
and without  reliance upon the Secured  Party and based upon such  documents and
information  as it has  deemed  appropriate,  made its own credit  analysis  and
decision to enter into this Agreement.  There are no conditions precedent to the
full  effectiveness  of this Agreement that have not been fully and  permanently
satisfied.

         Section 3.9. 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  3.10.  Benefit  to  Debtor.  The  value  of the  consideration
received  and to be received by the Debtor as a result of the  Borrower  and the
Secured  Party  entering into the Loan  Agreement  and the Debtor  executing and
delivering this Agreement is reasonably  worth at least as much as the liability
and  obligation of the Debtor  hereunder,  and such liability and obligation and
the  Borrower's  entering  into  the  Loan  Agreement  have  benefited  and  may
reasonably be expected to benefit the Debtor directly and indirectly.

                                   ARTICLE IV

                                    Covenants

         The Debtor  covenants  and agrees with the Secured Party that until the
Obligations  are paid and performed in full and all  commitments  of the Secured
Party to the Borrower and the Debtor have terminated:

         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

                                      - 4 -




<PAGE>



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.

         (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 the
Secured  Party,  the Debtor  shall not (a) grant any  extension  of time for any
payment with respect to any of the accounts, (b) compromise, compound, or settle
any of the accounts for less than the full amount thereof, (c) release, in whole
or in part,  any Person  liable  for  payment  thereof,  (d) allow any credit or
discount  for payment  with  respect to any account  other than (i) normal trade
discounts  granted in the ordinary  course of business or (ii)  discounts not to
exceed (without Secured Party's consent) $_______ individually or $______ 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 guaranty securing
any account.

         Section  4.4.  Disposition  of  Collateral.  The Debtor shall not sell,
lease,  assign (by operation of law or otherwise),  or otherwise  dispose of, or
grant any option with respect to, the Collateral or any part thereof without the
prior written consent of the Secured Party, except the 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 the Secured  Party,  and at the sole  expense of the Debtor,
the Debtor  shall  promptly  execute and deliver all such  further  instruments,
agreements,  and documents and take such further action as the 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 the 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.

         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

                                      - 5 -




<PAGE>



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  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. 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 4.8. 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 4.9. Corporate  Changes.  The 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
the Debtor  shall  have given the  Secured  Party 30 days prior  written  notice
thereof and shall have taken all action  deemed  necessary  or  desirable by the
Secured Party to make each  financing  statement not seriously  misleading.  The
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 the
Secured  Party 30 days prior  written  notice  thereof  and shall have taken all
action deemed  necessary or desirable by the Secured Party to cause its security
interest in the  Collateral to be perfected  with the priority  required by this
Agreement.


                                      - 6 -




<PAGE>



         Section  4.10.  Books and Records;  Information.  The Debtor shall keep
accurate  and  complete  books and records of the  Collateral  and the  Debtor's
business and financial  condition in accordance with GAAP. The Debtor shall from
time to time at the request of the Secured  Party  deliver to the Secured  Party
such  information  regarding the  Collateral and the Debtor as the Secured Party
may  request,  including,  without  limitation,  lists and  descriptions  of the
Collateral  and evidence of the identity and  existence of the  Collateral.  The
Debtor shall mark its books and records to reflect the security  interest of the
Secured Party under this Agreement.

         Section  4.11.  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 4.12. Warehouse Receipts Non-Negotiable. The Debtor agrees that
if any  warehouse  receipt or receipt  in the nature of a  warehouse  receipt is
issued in respect of any of the Collateral, 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 in effect in any relevant  jurisdiction
or under relevant law).

         Section 4.13.  Taxes.  The Debtor shall pay and  discharge,  before the
same become delinquent, all taxes, assessments, and governmental charges imposed
upon it or upon any of its property,  except Debtor shall not be required to pay
or discharge any such tax, assessment,  or governmental charge if (i) the amount
or validity thereof is being contested in good faith by proper proceedings being
diligently  pursued,  (ii) such  proceedings  do not  involve  any risk of sale,
forfeiture, or loss of the Collateral or any interest therein; or (iii) adequate
reserves therefor have been established in accordance with GAAP.

         Section  4.14.  Compliance  with Laws.  The Debtor  shall comply in all
material  respects with all applicable laws,  rules,  regulations,  orders,  and
decrees of any Governmental Authority or arbitrator.

         Section 4.15.  Compliance with  Agreements.  The Debtor shall comply in
all material respects with all agreements, contracts, and instruments binding on
it or affecting its properties or businesses.

         Section  4.16.  Notification.  The  Debtor  shall  promptly  notify the
Secured  Party of (a) any Lien made or asserted  against any of the  Collateral,
(b) any material change in any of the Collateral, including, without limitation,
any material damage to or loss of any of the  Collateral,  (c) the occurrence of
any other event that, with the giving of notice or lapse of time or both,  would
be an Event of Default.


                                      - 7 -




<PAGE>



         Section  4.17.  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 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 4.18. 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 4.19. Lockbox Account. The Debtor agrees to notify each account
debtor and other  obligor 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 obligor
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 attomey-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

                                      - 8 -




<PAGE>



         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;

              (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 Debtor's 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.


                                      - 9 -




<PAGE>



         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  OR  WILLFUL
MISCONDUCT.  This power 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.


                                     - 10 -




<PAGE>



                                   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  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.


                                     - 11 -




<PAGE>



              (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 nomine or nominees.

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

                                   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 such  indemnitee  shall be  indemnified  for its 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,

                                     - 12 -




<PAGE>



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.

         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  MATTER  HEREOF  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.


                                     - 13 -




<PAGE>



         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.

         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.



                                     - 14 -




<PAGE>



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

DEBTOR:                                     SECURED PARTY:
- -------                                     --------------


NORTHERN GEOPHYSICAL                        FIRST INTERSTATE BANK OF TEXAS,
OF AMERICA, INC.                            N.A.


By:___________________________              By:________________________
   J.D. White, Treasurer                       Randy Wade, Banking Officer

Address for Notices:                        Address of 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



                                     - 15 -




                               SECURITY AGREEMENT


         THIS  SECURITY  AGREEMENT  dated as of May 29, 1996,  is by and between
PARAGON GEOPHYSICAL,  INC., a Delaware corporation (the "Debtor"), whose address
is set forth on its signature page hereto,  and FIRST  INTERSTATE BANK OF TEXAS,
N.A., a national  banking  association (the "Secured  Party"),  whose address is
1000 Louisiana, Houston, Texas 77002.

                                R E C I T A L S:

         A. 3-D Geophysical,  Inc., a Delaware corporation (the "Borrower"), and
the Secured  Party have entered  into that  certain Loan  Agreement 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 to Borrower (i) a revolving  credit loan
in the aggregate  principal amount not to exceed  $3,000,000.00  and (ii) a term
loan in the aggregate principal amount not to exceed $15,000,000.00,  subject to
the  terms and  conditions  of the Loan  Agreement.  Terms  defined  in the Loan
Agreement and not otherwise defined herein being used as defined therein).

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





<PAGE>



                                   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 2.2.  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.


                                       -2-



<PAGE>



                                   ARTICLE III

                         Representations and Warranties

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

          Section  3.1.  Title.  The Debtor is, and with  respect to  Collateral
acquired  after the date  hereof  the Debtor  will be, the legal and  beneficial
owner of the Collateral free and clear of any Lien, security interest,  or other
encumbrance.

         Section 3.2.  Accounts.  Unless the Debtor has given the Secured  Party
written notice to the contrary, whenever the security interest granted hereunder
attaches  to an  account,  the Debtor  shall be deemed to have  represented  and
warranted to the Secured  Party as to each and all of its accounts that (a) each
account is genuine and in all respects  what it purports to be, (b) 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 the Debtor or the sale or lease of goods
by the  Debtor,  (c) 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 (d) 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 the
Secured Party pursuant to this Agreement.

         Section  3.4.  Principal  Place of  Business.  The  principal  place of
business  and chief  executive  office of the Debtor,  and the office  where the
Debtor  keeps its books and  records,  is located  at the  address of the Debtor
shown at the beginning of this Agreement.

         Section 3.5. 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  Collateral  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.

         Section 3.6.  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.


                                       -3-



<PAGE>



         Section 3.7.  Inventory.  All inventory has been produced in compliance
with all requirements of the Fair Labor Standards Act.

         Section 3.8. Independent  Investigation.  The Debtor has, independently
and without  reliance upon the Secured  Party and based upon such  documents and
information  as it has  deemed  appropriate,  made its own credit  analysis  and
decision to enter into this Agreement.  There are no conditions precedent to the
full  effectiveness  of this Agreement that have not been fully and  permanently
satisfied.

         Section 3.9. 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  3.10.  Benefit  to  Debtor.  The  value  of the  consideration
received  and to be received by the Debtor as a result of the  Borrower  and the
Secured  Party  entering into the Loan  Agreement  and the Debtor  executing and
delivering this Agreement is reasonably  worth at least as much as the liability
and  obligation of the Debtor  hereunder,  and such liability and obligation and
the  Borrower's  entering  into  the  Loan  Agreement  have  benefited  and  may
reasonably be expected to benefit the Debtor directly and indirectly.

                                   ARTICLE IV

                                    Covenants

         The Debtor  covenants  and agrees with the Secured Party that until the
Obligations  are paid and performed in full and all  commitments  of the Secured
Party to the Borrower and the Debtor have terminated:

         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

                                       -4-



<PAGE>



Collateral  is  located  not to  create,  permit,  or  suffer to exist any lien,
security interest, or other encumbrances on the Collateral.

         (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 the
Secured  Party,  the Debtor  shall not (a) grant any  extension  of time for any
payment with respect to any of the accounts, (b) compromise, compound, or settle
any of the accounts for less than the full amount thereof, (c) release, in whole
or in part,  any Person  liable  for  payment  thereof,  (d) allow any credit or
discount  for payment  with  respect to any account  other than (i) normal trade
discounts  granted in the ordinary  course of business or (ii)  discounts not to
exceed (without  Secured Party's consent)  $_______  individually or $_______ 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 guaranty
securing any account.

         Section  4.4.  Disposition  of  Collateral.  The Debtor shall not sell,
lease,  assign (by operation of law or otherwise),  or otherwise  dispose of, or
grant any option with respect to, the Collateral or any part thereof without the
prior written consent of the Secured Party, except the 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 the Secured  Party,  and at the sole  expense of the Debtor,
the Debtor  shall  promptly  execute and deliver all such  further  instruments,
agreements,  and documents and take such further action as the 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 the 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.

         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

                                       -5-



<PAGE>



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 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. 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 4.8. 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 4.9. Corporate  Changes.  The 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
the Debtor  shall  have given the  Secured  Party 30 days prior  written  notice
thereof and shall have taken all action  deemed  necessary  or  desirable by the
Secured Party to make each  financing  statement not seriously  misleading.  The
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 the
Secured  Party 30 days prior  written  notice  thereof  and shall have taken all
action deemed  necessary or desirable by the Secured Party to cause its security
interest in the  Collateral to be perfected  with the priority  required by this
Agreement.

         Section  4.10.  Books and Records;  Information.  The Debtor shall keep
accurate  and  complete  books and records of the  Collateral  and the  Debtor's
business and financial  condition in accordance with GAAP. The Debtor shall from
time to time at the request of the Secured  Party  deliver to the Secured  Party
such information regarding the Collateral and the Debtor as

                                       -6-



<PAGE>



the  Secured  Party  may  request,  including,  without  limitation,  lists  and
descriptions of the Collateral and evidence of the identity and existence of the
Collateral.  The Debtor shall mark its books and records to reflect the security
interest of the Secured Party under this Agreement.

         Section  4.11.  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 4.12. Warehouse Receipts Non-Negotiable. The Debtor agrees that
if any  warehouse  receipt or receipt  in the nature of a  warehouse  receipt is
issued in respect of any of the Collateral, 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 in effect in any relevant  jurisdiction
or under relevant law).

         Section 4.13.  Taxes.  The Debtor shall pay and  discharge,  before the
same become delinquent, all taxes, assessments, and governmental charges imposed
upon it or upon any of its property,  except Debtor shall not be required to pay
or discharge any such tax, assessment,  or governmental charge if (i) the amount
or validity thereof is being contested in good faith by proper proceedings being
diligently  pursued,  (ii) such  proceedings  do not  involve  any risk of sale,
forfeiture, or loss of the Collateral or any interest therein; or (iii) adequate
reserves therefor have been established in accordance with GAAP.

         Section  4.14.  Compliance  with Laws.  The Debtor  shall comply in all
material  respects with all applicable laws,  rules,  regulations,  orders,  and
decrees of any Governmental Authority or arbitrator.

         Section 4.15.  Compliance with  Agreements.  The Debtor shall comply in
all material respects with all agreements, contracts, and instruments binding on
it or affecting its properties or businesses.

         Section  4.16.  Notification.  The  Debtor  shall  promptly  notify the
Secured  Party of (a) any Lien made or asserted  against any of the  Collateral,
(b) any material change in any of the Collateral, including, without limitation,
any material damage to or loss of any of the  Collateral,  (c) the occurrence of
any other event that, with the giving of notice or lapse of time or both,  would
be an Event of Default.

         Section  4.17.  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

                                       -7-



<PAGE>



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 4.18. 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 4.19. Lockbox Account. The Debtor agrees to notify each account
debtor and other obligers 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 obligers
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 1/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;


                                       -8-



<PAGE>



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

              (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 Debtor's 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  OR  WILLFUL
MISCONDUCT.  This power of  attorney is  conferred  on Secured  Party  solely to
protect,

                                       -9-



<PAGE>



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  acceleration,  notice  of  intent to
         accelerate, notice of intent to demand, protest, or other

                                      -10-



<PAGE>



         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-



<PAGE>



                                   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 such  indemnitee  shall be  indemnified  for its 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.

         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,

                                      -12-



<PAGE>



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  MATTER  HEREOF  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   Agree-  ment  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 counter- parts,  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.

         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 Agree-

                                      -13-



<PAGE>



ment, 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:

PARAGON GEOPHYSICAL, INC.                   FIRST INTERSTATE BANK OF TEXAS, N.A.



By:______________________                   By:_________________________________
   J.D. White                                  Randy Wade
   Treasurer                                   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) 744-3700              Telephone No.:  (713) 250-7240
Attention:  President                       Attention:  Mr. Marc A. Dunmire



                                      -14-



SECURITY AGREEMENT EXECUTED BETWEEN THE GUARANTOR, GEOEVALUACIONES, S.A. DE C.V.
(THE  "GUARANTOR")  REPRESENTED  BY MR.  ___________  AND  THE  CREDITOR,  FIRST
INTERSTATE BANK OF TEXAS, N.A. ("THE CREDITOR") REPRESENTED BY MR. _____________
IN ACCORDANCE WITH THE FOLLOWING DECLARATIONS AND CLAUSES:

                                  DECLARATIONS

I. The GUARANTOR, a company duly incorporated in accordance with the laws of the
United  Mexican  States has  guaranteed  to the  CREDITOR,  a  national  banking
association  organized under the laws of the United States of America,  loans to
3-D  Geophysical,  Inc.  (the  "DEBTOR"),  in the  amount  of  US.$18,000,000.00
(Eighteen  Million  Dollars)  plus  interest  which  it is  obligated  to pay in
accordance with the terms of the Loan Agreement (the "Loan Agreement"), executed
as of May 29, 1996, attached hereto as Annex "A".

II.  The  GUARANTOR,  having a legal  interest  in  guaranteeing  and paying the
DEBTOR's  debts to the CREDITOR,  and in order to secure the prompt  payment and
performance  in  full  of all  of  the  DEBTOR's  obligations  to the  CREDITOR,
GUARANTOR hereby grants to the CREDITOR 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:

(a) all accounts  receivable,  documents,  instruments,  chattel paper,  general
intangibles of GUARANTOR, 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 GUARANTOR, whether now
owned or hereafter  acquired,  and all  accessions  thereto and all products and
proceeds thereof;

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

(d) the Lockbox  Account (as defined in the Loan  Agreement),  any other deposit
accounts now or hereafter  maintained  by GUARANTOR at or with  CREDITOR 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.

In accordance with the above, the parties hereby agree as follows:





<PAGE>



                                     CLAUSES

FIRST. The GUARANTOR hereby grants a security interest in favor of the CREDITOR,
who accepts, all of the rights, proceeds and benefits derived from the equipment
and property set forth in detail in Annex "B".

SECOND.  The Guarantor as the depository  shall hold all equipment and machinery
detailed in Annex "B" of the Agreement.

THIRD.  The  GUARANTOR is  authorized  to use the  equipment  and tools  without
causing  major damage or loss.  To that effect,  it shall be  maintained in good
condition,  repaired and insured  against any risk to which it might be exposed,
including,  but not  limited to,  fire,  flood,  theft,  and  collision  for the
CREDITOR,  which  shall  receive  payment for any loss,  in such  amounts as the
CREDITOR  may  require.  The  GUARANTOR  guarantees  that it shall  maintain the
property of the equipment and tools,  free of any liens,  encumbrances or claims
(except for those granted  herein and any others  related  hereto),  agreeing to
preserve and defend the rights of the CREDITOR  under the present  Agreement for
the loss,  damage or  destruction  of the  equipment  and/or tools for which the
GUARANTOR is exclusively responsible.

The GUARANTOR,  shall prepare and send to the CREDITOR,  financial statements or
other  documents  or  instruments,  or follow any other  instruction  considered
necessary  by the  CREDITOR  which  it may  give  from  time to time in order to
perfect or continue this security  interest.  The GUARANTOR  shall  maintain its
principal  domicile at Av. Rio  Churubusco  No. 522,  Colonia El Retono,  09440,
Mexico,  D.F., where it shall store the equipment and tools. The above-mentioned
domicile may be modified with the prior written authorization of the CREDITOR.

FOURTH.  At any time, and from time to time,  whether any of the secured debt be
due and totally or partially payable,  the CREDITOR may in its discretion and at
the expense of the GUARANTOR:  (i) judicially  request the sale of the equipment
and/or  tools,  (ii) inspect the books and registers of the GUARANTOR and obtain
copies of the same,  (iii)  apply to the  payment of any  portion of the secured
debts, whether due or not, any amounts of monies, including dividends or income,
now or hereafter in the hands of the CREDITOR on deposit or otherwise, under the
terms to be decided by the CREDITOR.

FIFTH. In the event that the GUARANTOR does not comply with the obligations that
it contracted for in accordance  with the terms of the Loan  Agreement  which is
attached  hereto as Annex "A", the CREDITOR may request the judicial sale of the
secured goods. Notice shall be given to the GUARANTOR and it shall have a period
of three days to oppose the said sale by showing  receipts of the payment of the
guaranteed  debt;  if the  GUARANTOR  does not oppose the sale,  the judge shall
order that the sale shall be carried out at a price fixed by a public  appraiser
("Corredor Publico") or by two commercial vendors with businesses located in the
domicile which are dedicated to the sale of similar products. The results of the
sales shall

                                       -2-



<PAGE>



immediately  be  delivered  to the  CREDITOR who shall apply them to the debt in
accordance with the terms of the Loan Agreement Annex "A".

SIXTH. This security interest shall continue all payments due to the CREDITOR by
the DEBTOR are paid or until the complete  execution of the security interest in
accordance with the terms previously agreed upon herein.

SEVENTH.  This  contract  shall be governed  by and in the case of an  omission,
supplemented  by  the  applicable  provisions  of  the  General  Law  of  Credit
Instruments  and  Operations  and as well as by the  Civil  Code of the  Federal
District.

EIGHT.  The parties agree to submit the  interpretation  and performance of this
contract to the jurisdiction of the Courts of Mexico City, Federal District, and
hereby waive any other to which they may be entitled by reason of their  present
or future domicile.

The parties hereby sign the present contract in triplicate.


         THE GUARANTOR                      THE CREDITOR
         

Geoevaluaciones, S.A. de C.V.               First Interstate Bank of Texas, N.A.
                                                                                
By:_________________________                By:_________________________________
                                                                                
Name:_______________________                Name:_______________________________
                                                                                
Title:______________________                Title:______________________________
                                            









                                       -3-




                               GUARANTY AGREEMENT


         WHEREAS, the execution of this Guaranty Agreement is a condition to 3-D
GEOPHYSICAL,  INC., a Delaware  corporation  ("Borrower"),  borrowing money from
FIRST INTERSTATE BANK OF TEXAS, N.A., a national banking association ("Lender"),
pursuant  to that  certain  Loan  Agreement  dated as of May 26,  1996,  between
Borrower and Lender (such Loan  Agreement,  as the same may hereafter be amended
or  modified  from  time to time,  being  hereinafter  referred  to as the "Loan
Agreement");

         WHEREAS,  as of the date hereof, the Guaranteed  Indebtedness  (defined
below) includes (i) a revolving credit loan in the amount of  $3,000,000.00  and
(ii) a term loan in the original principal amount of $15,000,000.00;

         NOW, THEREFORE, for valuable consideration, the receipt and adequacy of
which are hereby acknowledged, the undersigned, Northern Geophysical of America,
Inc.,  a  Delaware   corporation  (the  "Guarantor"),   hereby  irrevocably  and
unconditionally guarantees to Lender the full and prompt payment and performance
of the Guaranteed  Indebtedness  (hereinafter defined),  this Guaranty Agreement
being upon the following terms:

         1. The term "Guaranteed Indebtedness", as used herein, means all of the
"Obligations" (as defined in the Loan Agreement), including, without limitation,
(i) that certain  promissory note in the original principal amount of $3,000,000
dated of even date herewith,  (ii) that certain  promissory note in the original
principal  amount of  $15,000,000.00  dated of even date  herewith,  each  being
executed by Borrower and payable to the order of Lender and (iii) all  renewals,
extensions and modifications  thereof. The term "Guaranteed  Indebtedness" shall
include  future  advances  and any and all  post-petition  interest and expenses
(including  attorneys'  fees)  whether  or not  allowed  under  any  bankruptcy,
insolvency, or other similar law.

         2. This instrument shall be an absolute,  continuing,  irrevocable, and
unconditional  guaranty  of  payment  and  performance,  and not a  guaranty  of
collection, and Guarantor shall remain liable on its obligations hereunder until
the payment and performance in full of the Guaranteed Indebtedness.  No set-off,
counterclaim,  recoupment,  reduction,  or diminution of any obligation,  or any
defense of any kind or nature  which  Borrower  may have  against  Lender or any
other party, or which Guarantor may have against Borrower,  Lender, or any other
party,  shall be available to, or shall be asserted by, Guarantor against Lender
or any subsequent  holder of the Guaranteed  Indebtedness or any part thereof or
against payment of the Guaranteed Indebtedness or any part thereof.

         3. If Guarantor  becomes liable for any indebtedness  owing by Borrower
to Lender by endorsement or otherwise, other than under this Guaranty Agreement,
such liability shall not be in any manner impaired or affected  hereby,  and the
rights of Lender  hereunder shall be cumulative of any and all other rights that
Lender may ever have against  Guarantor.  The exercise by Lender of any right or
remedy hereunder or under any other instrument, or at law




<PAGE>



or in equity,  shall not preclude the  concurrent or subsequent  exercise of any
other right or remedy.

         4. In the event of default by Borrower in payment or performance of the
Guaranteed Indebtedness,  or any part thereof, when such Guaranteed Indebtedness
becomes due,  whether by its terms,  by  acceleration,  or otherwise,  Guarantor
shall  promptly pay the amount due thereon to Lender  without  notice or demand,
except as expressly provided for herein, in lawful currency of the United States
of America and it shall not be  necessary  for Lender,  in order to enforce such
payment by Guarantor,  first to institute  suit or exhaust its remedies  against
Borrower or others  liable on such  Guaranteed  Indebtedness,  or to enforce any
rights  against any  collateral  which shall ever have been given to secure such
Guaranteed  Indebtedness.  Notwithstanding anything to the contrary contained in
this Guaranty Agreement,  Guarantor hereby irrevocably waives any and all rights
it may  now  or  hereafter  have  under  any  agreement  or at law or in  equity
(including,  without limitation, any law subrogating the Guarantor to the rights
of Lender) to assert any claim against or seek contribution,  indemnification or
any other form of  reimbursement  from  Borrower or any other  party  liable for
payment of any or all of the  Guaranteed  Indebtedness  for any payment  made by
Guarantor under or in connection with this Guaranty Agreement or otherwise.

         5. If  acceleration  of the time for  payment of any amount  payable by
Borrower  under  the  Guaranteed  Indebtedness  is stayed  upon the  insolvency,
bankruptcy, or reorganization of Borrower, all such amounts otherwise subject to
acceleration under the terms of the Guaranteed Indebtedness shall nonetheless be
payable by Guarantor hereunder forthwith on demand by Lender.

         6.  Guarantor  hereby agrees that its  obligations  under this Guaranty
Agreement shall not be released, discharged,  diminished,  impaired, reduced, or
affected for any reason or by the  occurrence of any event,  including,  without
limitation,  one or more of the following events,  whether or not with notice to
or the  consent of  Guarantor:  (a) the taking or  accepting  of  collateral  as
security  for  any  or  all  of the  Guaranteed  Indebtedness  or  the  release,
surrender,  exchange,.  or  subordination  of any  collateral  now or  hereafter
securing any or all of the Guaranteed  Indebtedness;  (b) any partial release of
the  liability of  Guarantor  hereunder,  or the full or partial  release of any
other  guarantor from  liability for any or all of the Guaranteed  Indebtedness;
(c) any disability of Borrower, or the dissolution, insolvency, or bankruptcy of
Borrower,  Guarantor,  or any other  party at any time liable for the payment of
any  or  all  of  the  Guaranteed  Indebtedness;  (d)  any  renewal,  extension,
modification,  waiver,  amendment,  or  rearrangement  of  any  or  all  of  the
Guaranteed  Indebtedness or any instrument,  document,  or agreement evidencing,
securing,  or  otherwise  relating  to any or all of the  Indebtedness;  (e) any
adjustment,  indulgence,  forbearance, waiver, or compromise that may be granted
or given by Lender to  Borrower,  Guarantor,  or any other party ever liable for
any or all of the Guaranteed  Indebtedness;  (f) any neglect,  delay,  omission,
failure, or refusal of Lender to take or prosecute any action for the collection
of any of the Guaranteed  Indebtedness  or to foreclose or take or prosecute any
action in connection with any instrument, document, or agreement evidencing,

                                      - 2 -




<PAGE>



securing,  or  otherwise  relating  to any or all of the  Indebtedness;  (g) the
unenforceability  or invalidity of any or all of the Guaranteed  Indebtedness or
of any instrument,  document,  or agreement  evidencing,  securing, or otherwise
relating  to any or all of the  Guaranteed  Indebtedness;  (h)  any  payment  by
Borrower or any other party to Lender is held to  constitute a preference  under
applicable  bankruptcy  or  insolvency  law or if for any other reason Lender is
required to refund any payment or pay the amount  thereof to someone  else;  (i)
the  settlement  or compromise of any of the  Guaranteed  Indebtedness;  (j) the
non-perfection  of any  security  interest  or lien  securing  any or all of the
Guaranteed  Indebtedness;  (k) any impairment of any collateral  securing any or
all of the  Guaranteed  Indebtedness;  (l) the  failure  of  Lender  to sell any
collateral securing any or all of the Guaranteed  Indebtedness in a commercially
reasonable  manner  or as  otherwise  required  by law;  (m) any  change  in the
corporate  existence,  structure,  or ownership  of  Borrower;  or (n) any other
circumstance  which  might  otherwise  constitute  a  defense  available  to, or
discharge of, Borrower or Guarantor.

         7. Guarantor represents and wan-ants to Lender as follows:

              (a) Guarantor is a corporation  duly organized,  validly  existing
         and  in  good  standing  under  the  laws  of the  jurisdiction  of its
         incorporation,  is  qualified  to do business in all  jurisdictions  in
         which  the  nature  of  the   business   conducted  by  it  makes  such
         qualification  necessary  and where  failure to so qualify would have a
         material  adverse  effect  on its  business,  financial  condition,  or
         operations.

              (b)  Guarantor  has the  corporate  power and  authority and legal
         right to  execute,  deliver,  and perform  its  obligations  under this
         Guaranty Agreement and this Guaranty  Agreement  constitutes the legal,
         valid,  and  binding  obligation  of  Guarantor,   enforceable  against
         Guarantor in accordance with its respective terms, except as limited by
         bankruptcy,  insolvency,  or other laws of general application relating
         to the enforcement of creditor's rights.

              (c) The execution,  delivery, and performance by Guarantor of this
         Guaranty Agreement have been duly authorized by all requisite action on
         the part of Guarantor  and do not and will not violate or conflict with
         the articles of  incorporation or bylaws of Guarantor or any law, rule,
         or  regulation or any order,  writ,  injunction or decree of any court,
         governmental authority or agency, or arbitrator and do not and will not
         conflict with, result in a breach of, or constitute a default under, or
         result  in the  imposition  of any lien upon any  assets  of  Guarantor
         pursuant to the provisions of any indenture,  mortgage,  deed of trust,
         security agreement,  franchise, permit, license, or other instrument or
         agreement to which Guarantor or its properties is bound.

              (d) No  authorization,  approval,  or consent of, and no filing or
         registration on with, any court, governmental authority, or third party
         is necessary for the execution, delivery or performance by Guarantor of
         this Guaranty Agreement or the validity or enforceability thereof.

                                      - 3 -




<PAGE>




              (e) The value of the consideration  received and to be received by
         as a result of Borrower and Lender entering into the Loan Agreement and
         executing and delivering this Guaranty Agreement is reasonably worth at
         least as much as the liability and  obligation of Guarantor  hereunder,
         and such liability and obligation and the Loan Agreement have benefited
         and may  reasonably  be  expected  to  benefit  Guarantor  directly  or
         indirectly.

              (f) Guarantor has,  independently and without reliance upon Lender
         and based upon such  documents and  information as Guarantor has deemed
         appropriate,  made its own  analysis  and  decision  to enter into this
         Guaranty Agreement.

              (g) Guarantor hereby represents that (i) it is not insolvent as of
         the date hereof and will not be rendered  insolvent as a result of this
         Guaranty   Agreement,   (ii)  it  is  not  engaged  in  business  or  a
         transaction,  or about to engage in a business  or a  transaction,  for
         which  any  property  or  assets   remaining  with  such  Guarantor  is
         unreasonably  small capital,  and (iii) it does not intend to incur, or
         believe it will incur,  debts that will be beyond its ability to pay as
         such debts mature.

         8.  Guarantor  covenants  and agrees  that,  as long as the  Guaranteed
Indebtedness  or any part thereof is  outstanding  or Lender has any  commitment
under the Loan Agreement:

              (a) Guarantor  will furnish  promptly to Lender  written notice of
         the  occurrence  of any  default  under this  Guaranty  Agreement  or a
         Default under the Loan Agreement of which Guarantor his knowledge.

              (b)  Guarantor  will  furnish  promptly to Lender such  additional
         information concerning Guarantor as Lender may request.

              (c)  Guarantor  will  obtain at any time and from time to time all
         authorizations,  licenses,  consents  or  approvals  as  shall  now  or
         hereafter  be  necessary  or  desirable  under all  applicable  laws or
         regulations or otherwise in connection with the execution, delivery and
         performance of this Guaranty Agreement and will promptly furnish copies
         thereof to Lender.

         9. (a) Guarantor hereby agrees that the  Subordinated  Indebtedness (as
hereinafter  defined) shall be subordinate and junior in right of payment to the
prior  payment in full of all  Guaranteed  Indebtedness,  and  Guarantor  hereby
assigns the  Subordinated  Indebtedness to Lender as security for the Guaranteed
Indebtedness.  If any sums shall be paid to  Guarantor  by Borrower or any other
person or entity on account of the Subordinated Indebtedness, such sums shall be
held in trust by Guarantor for the benefit of Lender and shall forthwith be paid
to Lender  without  affecting  the  liability of Guarantor  under this  Guaranty
Agreement and may be applied by Lender  against the Guaranteed  Indebtedness  in
such order and manner as Lender may determine in its sole

                                      - 4 -




<PAGE>



discretion.  Upon the request of Lender,  Guarantor shall execute,  deliver, and
endorse to Lender  such  documents  and  instruments  as Lender  may  request to
perfect,  preserve,  and  enforce  its rights  hereunder.  For  purposes of this
Guaranty Agreement, the term "Subordinated Indebtedness" means all indebtedness,
liabilities,   and   obligations   of  Borrower  to   Guarantor,   whether  such
indebtedness,  liabilities,  and obligations now exist or are hereafter incurred
or arise, or whether the obligations of Borrower  thereon are direct,  indirect,
contingent,  primary,  secondary,  several, joint and several, or otherwise, and
irrespective  of whether such  indebtedness,  liabilities,  or  obligations  are
evidenced by a note, contract,  open account, or otherwise,  and irrespective of
the  person  or  persons  in whose  favor  such  indebtedness,  obligations,  or
liabilities may, at their inception,  have been, or may hereafter be created, or
the manner in which they have been or may hereafter be acquired by Guarantor.

         (b)  Guarantor  agrees  that  any and all  liens,  security  interests,
judgment liens,  charges,  or other encumbrances upon Borrower's assets securing
payment  of any  Subordinated  Indebtedness  shall be and  remain  inferior  and
subordinate to any and all liens,  security interests,  judgment liens, charges,
or other  encumbrances upon Borrower's assets securing payment of the Guaranteed
Indebtedness  or any part thereof,  regardless of whether such  encumbrances  in
favor of  Guarantor  or  Lender  presently  exist or are  hereafter  created  or
attached.  Without the prior written consent of Lender,  Guarantor shall not (i)
file suit against  Borrower or exercise or enforce any other creditor's right it
may have against Borrower, or (ii) foreclose, repossess, sequester, or otherwise
take steps or  institute  any action or  proceedings  (j)udicial  or  otherwise,
including   without   limitation  the   commencement  of,  or  joinder  in,  any
liquidation,   bankruptcy,   rearrangement,   debtor's   relief  or   insolvency
proceeding)  to  enforce  any  liens,  security  interests,  collateral  rights,
judgments or other encumbrances held by Guarantor on assets of Borrower.

         (c)  In the  event  of any  receivership,  bankruptcy,  reorganization,
rearrangement,   debtor's  relief,  or  other  insolvency  proceeding  involving
Borrower  as  debtor,  Lender  shall  have the right to prove and vote any claim
under the  Subordinated  Indebtedness and to receive directly from the receiver,
trustee or other court custodian all dividends, distributions, and payments made
in  respect  of  the  Subordinated  Indebtedness.  Lender  may  apply  any  such
dividends,  distributions,  and payments against the Guaranteed  Indebtedness in
such order and manner as Lender may determine in its sole discretion.

         (d) Guarantor agrees that all promissory  notes,  accounts  receivable,
ledgers,  records,  or any other  evidence of  Subordinated  Indebtedness  shall
contain a  specific  written  notice  thereon  that the  indebtedness  evidenced
thereby is subordinated under the terms of this Guaranty Agreement.

         10. No amendment or waiver of any provision of this Guaranty  Agreement
or consent to any  departure by the  Guarantor  therefrom  shall in any event be
effective  unless the same shall be in writing and signed by Lender.  No failure
on the part of Lender to exercise, and no delay in exercising, any right, power,
or privilege hereunder shall operate as a waiver thereof; nor

                                      - 5 -




<PAGE>



shall any single or partial exercise of any right, power, or privilege hereunder
preclude  any other or further  exercise  thereof or the  exercise  of any other
right, power, or privilege.  The remedies herein provided are cumulative and not
exclusive of any remedies provided by law.

         11. Any acknowledgment or new promise,  whether by payment of principal
or  interest  or  otherwise  and  whether  by  Borrower  or  others   (including
Guarantor),  with respect to any of the Guaranteed  Indebtedness  shall,  if the
statute of limitations in favor of Guarantor against Lender shall have commenced
to run,  toll the running of such statute of  limitations  and, if the period of
such statute of  limitations  shall have expired,  prevent the operation of such
statute of limitations.

         12.  This  Guaranty  Agreement  is for the  benefit  of Lender  and its
successors  and assigns,  and in the event of an  assignment  of the  Guaranteed
Indebtedness,  or any part thereof,  the rights and benefits  hereunder,  to the
extent applicable to the indebtedness so assigned,  may be transferred with such
indebtedness.  This Guaranty Agreement is binding not only on Guarantor,  but on
Guarantor's successors and assigns.

         13.  Guarantor  recognizes  that Lender is relying  upon this  Guaranty
Agreement and the  undertakings of Guarantor  hereunder in making  extensions of
credit to Borrower  under the Loan  Agreement  and further  recognizes  that the
execution  and delivery of this Guaranty  Agreement is a material  inducement to
Lender in entering into the Loan Agreement.  Guarantor hereby  acknowledges that
there are no conditions to the full effectiveness of this Guaranty Agreement.

         14. This Guaranty Agreement is executed and delivered as an incident to
a lending transaction negotiated, consummated, and performable in Harris County,
Texas, and shall be governed by and construed in accordance with the laws of the
State  of  Texas.  Any  action  or  proceeding  against  Guarantor  under  or in
connection  with this Guaranty  Agreement may be brought in any state or federal
court in Harris County,  Texas.  Guarantor hereby irrevocably (i) submits to the
nonexclusive  jurisdiction of such courts,  and (ii) waives any objection it may
now or hereafter  have as to the venue of any such action or proceeding  brought
in such court or that such court is an inconvenient forum. Guarantor agrees that
service of process upon it may be made by certified or registered  mail,  return
receipt requested,  at its address specified below.  Nothing herein shall affect
the right of Lender to serve  process in any other  matter  permitted  by law or
shall  limit  the right of Lender  to bring  any  action or  proceeding  against
Guarantor  or with  respect to any of  Guarantor's  property  in courts in other
jurisdictions.  Any action or  proceeding by Guarantor  against  Lender shall be
brought only in a court located in Harris County, Texas.

         15.  Guarantor  shall pay on demand all  attorneys'  fees and all other
costs  and  expenses  incurred  by Lender in  connection  with the  preparation,
administration, enforcement, or collection of this Guaranty Agreement.


                                      - 6 -




<PAGE>



         16. Except as expressly  provided for herein,  Guarantor  hereby waives
promptness,  diligence, notice of any default under the Guaranteed Indebtedness,
demand of payment, notice of acceptance of this Guaranty Agreement, presentment,
notice of protest, notice of dishonor, notice of intent to accelerate, notice of
acceleration,  notice of the incurring by Borrower of  additional  indebtedness,
and all other  notices and demands with respect to the  Guaranteed  Indebtedness
and this Guaranty  Agreement.  Without limiting the generality of the foregoing,
Guarantor  unconditionally waives, to the extent permitted by law, (a) notice of
any of the matters  referred to in Section 6 above, (b) all notices which may be
required by statute,  rule of law or otherwise,  now or hereafter in effect,  to
preserve intact any rights against Guarantor, including, without limitation, any
demand, presentment and protest, proof of notice of non-payment under any of the
Loan  Documents and notice of any Event of Default or any failure on the part of
Borrower,  Guarantor  or any other  guarantor of the  Obligations  to perform or
comply  with  any  covenant,  agreement,  term or  condition  of any of the Loan
Documents,  (b) any right to the  enforcement,  assertion  or  exercise  against
Borrower, Guarantor or any other guarantor of the Obligations and the Guaranteed
Indebtedness,  as applicable,  of any right or remedy conferred under any of the
Loan Documents,  (d) any requirement of diligence on the part of any Person, (e)
any  requirement  to exhaust any remedies or to mitigate  the damages  resulting
from any default  under any of the Loan  Documents,  (f) any notice of any sale,
transfer or other disposition of any right, tide or interest of Lender under any
of the Loan Documents and (g) any rights of Guarantor  pursuant to Chapter 34 of
the Texas Business and Commerce Code, as amended.

         17. The Loan Agreement,  and all of the terms thereof, are incorporated
herein by reference, the same as if stated verbatim herein, and Guarantor agrees
that  Lender  may  exercise  any and all  rights  granted  to it under  the Loan
Agreement  and the other  Loan  Documents  (as  defined  in the Loan  Agreement)
without affecting the validity or enforceability of this Guaranty Agreement.

         18. Guarantor  hereby  represents and wan-ants to Lender that Guarantor
has adequate  means to obtain from  Borrower on a continuing  basis  information
concerning the financial  condition and assets of Borrower and that Guarantor is
not relying  upon Lender to provide  (and Lender  shall have no duty to provide)
any such information to Guarantor either now or in the future.

         19. THIS GUARANTY  AGREEMENT  EMBODIES THE FINAL,  ENTIRE  AGREEMENT OF
GUARANTOR  AND LENDER WITH  RESPECT TO  GUARANTOR'S  GUARANTY OF THE  GUARANTEED
INDEBTEDNESS  AND  SUPERSEDES  ANY  AND  ALL  PRIOR   COMMITMENTS,   AGREEMENTS,
REPRESENTATIONS,  AND  UNDERSTANDINGS,  WHETHER  WRITTEN OR ORAL RELATING TO THE
SUBJECT  MATTER  HEREOF.  THIS  GUARANTY  AGREEMENT IS INTENDED BY GUARANTOR AND
LENDER  AS A  FINAL  AND  COMPLETE  EXPRESSION  OF THE  TERMS  OF  THE  GUARANTY
AGREEMENT,  AND NO COURSE OF DEALING BETWEEN  GUARANTOR AND LENDER, NO COURSE OF
PERFORMANCE, NO

                                      - 7 -




<PAGE>



TRADE PRACTICES,  AND NO EVIDENCE OF PRIOR,  CONTEMPORANEOUS  OR SUBSEQUENT ORAL
AGREEMENTS OR  DISCUSSIONS  OR OTHER  EXTRINSIC  EVIDENCE OF ANY NATURE SHALL BE
USED TO  CONTRADICT,  VARY,  SUPPLEMENT  OR  MODIFY  ANY  TERM OF THIS  GUARANTY
AGREEMENT. THERE ARE NO ORAL AGREEMENTS BETWEEN GUARANTOR AND LENDER.


         20. THE PARTIES  AGREE TO BE BOUND BY THE TERMS AND  CONDITIONS  OF THE
CURRENT ARBITRATION PROGRAM OF LENDER, WHICH IS INCORPORATED HEREIN BY REFERENCE
AND  ACKNOWLEDGED  AS  RECEIVED  BY THE  PARTIES  PURSUANT  TO WHICH ANY AND ALL
DISPUTES SHALL BE RESOLVED BY MANDATORY BINDING  ARBITRATION UPON THE REQUEST OF
ANY PARTY.

         21. (a) All payments  payable  hereunder  in respect of the  Guaranteed
Obligations  shall be payable by  Guarantor  to  Beneficiary  in the currency in
which the  Guaranteed  Obligations  are expressed  (herein  called the "Required
Currency"). The obligation of Guarantor to make payment in the Required Currency
shall not be discharged  or satisfied by any payment or tender,  or any recovery
pursuant to any judgment or order, which is or is expressed in or converted into
any  currency  other  than the  Required  Currency,  except to the  extent  such
payment, tender or recovery shall result in the actual receipt by Beneficiary of
the full amount of the  Required  Currency  expressed  to be payable  hereunder.
Without  limiting  the  generality  of  the  foregoing,   Guarantor   authorizes
Beneficiary,  on any  payment,  tender or recovery in a currency  other than the
Required  Currency,  to  purchase  in  accordance  with its  normal  procedures,
Required  Currency  with the  amount  of such  other  currency  so  tendered  or
recovered. The obligation of Guarantor to make payments in the Required Currency
shall be enforceable  as an  alternative  or additional  cause of action for the
purpose of  recovery  in the  Required  Currency of the amount (if any) by which
such actual  receipt shall fall short of the full amount due hereunder and shall
not be  affected by judgment  being  obtained  for any other sums due under this
Guaranty.

         (b) All payments  made to  Beneficiary  hereunder  shall be made in the
Required  Currency  for value on the day on which  payment is due,  without  any
setoff or counterclaim,  free and clear of and without  deduction or withholding
for or on account of, any present or future  taxes now or  hereafter  imposed by
any  governmental  or other  authority.  As used herein,  the term "Taxes" shall
include  all  withholding,  income,  gains,  excise,  stamp and  other  taxes of
whatever nature as well as all withholding,  levies, imports, duties, charges or
fees of whatever  nature.  If  Guarantor  is  compelled  by law to make any such
deductions  or  withholdings,  it will pay  such  additional  amounts  as may be
necessary  in order that the net amount  received  and  retained by  Beneficiary
after such  deduction  or  withholdings  (including  any  required  deduction or
withholding  on such  additional  amounts)  shall equal the amount it would have
received and retained had no such deductions or withholdings been required to be
made, and it will provide Beneficiary with evidence  satisfactory to Beneficiary
that it has paid such deduction or

                                      - 8 -




<PAGE>



withholdings.  Guarantor  hereby  agrees to  indemnify  Beneficiary  and hold it
harmless  against  all losses,  costs,  expenses  or other  amounts  incurred or
suffered by  Beneficiary  by reason of the failure of  Guarantor  to perform its
obligations under this clause (b).

         22. WITH RESPECT TO ANY AND ALL DISPUTES ARISING  HEREUNDER,  UNDER THE
NOTES,  UNDER  THE  OTHER  GUARANTEED  OBLIGATIONS,  OR UNDER  ANY OF THE  OTHER
INSTRUMENTS  AND  DOCUMENTS  EXECUTED IN  CONNECTION  HEREWITH OR THEREWITH  NOT
SETTLED  OR  SUBJECT  TO  ARBITRATION,   PURSUANT  TO  ANY  ARBITRATION  PROGRAM
REFERENCED TO HEREIN, GUARANTOR HEREBY IRREVOCABLY AND UNCONDITIONALLY:

         (a)  SUBMITS  FOR  ITSELF  AND ITS  PROPERTY  IN ANY  LEGAL  ACTION  OR
PROCEEDING  RELATING TO THIS  GUARANTY  AND ANY OTHER  DOCUMENT TO WHICH IT IS A
PARTY,  OR FOR  RECOGNITION  AND  ENFORCEMENT  OF ANY JUDGMENT IN RESPECT OF ANY
THEREOF, TO THE NON-EXCLUSIVE GENERAL JURISDICTION OF THE COURTS OF THE STATE OF
TEXAS,  THE COURTS OF THE UNITED STATES OF AMERICA FOR THE SOUTHERN  DISTRICT OF
TEXAS, AND APPELLATE COURTS FROM ANY THEREOF;

         (b) CONSENTS THAT ANY SUCH ACTION OR PROCEEDING  MAY BE BROUGHT IN SUCH
COURTS,  AND WAIVES ANY OBJECTION THAT IT MAY NOW OR HEREAFTER HAVE TO THE VENUE
OF ANY SUCH  ACTION  OR  PROCEEDING  IN ANY SUCH  COURT OR THAT  SUCH  ACTION OR
PROCEEDING WAS BROUGHT IN AN IMPROPER VENUE OR AN INCONVENIENT  COURT AND AGREES
NOT TO PLEAD OR CLAIM THE SAME;

         (c) AGREES THAT SERVICE OF PROCESS IN ANY SUCH ACTION OR PROCEEDING MAY
BE EFFECTED BY MAILING A COPY THEREOF BY  REGISTERED  OR CERTIFIED  MAIL (OR ANY
SUBSTANTIALLY  SIMILAR  FORM OF MAIL),  POSTAGE  PREPAID,  TO IT AT ITS  ADDRESS
SPECIFIED ON THE SIGNATURE PAGE HEREOF;

         (d) AGREES THAT NOTHING HEREIN SHALL AFFECT THE RIGHT TO EFFECT SERVICE
OF PROCESS IN ANY OTHER MANNER  PERMITTED BY LAW OR SHALL LIMIT THE RIGHT TO SUE
IN ANY OTHER JURISDICTION;

         (e) DESIGNATES AND APPOINTS MIKE WEBB, WHOSE ADDRESS ON THE DATE HEREOF
IS 1990 POST OAK BLVD., SUITE 1670, HOUSTON, TEXAS 77056 (HEREINAFTER CALLED THE
"PROCESS AGENT"),  AS ITS  ATTORNEY-IN-FACT  IN THE UNITED STATES OF AMERICA, TO
RECEIVE  SERVICE OF PROCESS IN ANY ACTION,  SUIT OR PROCEEDING,  IT BEING AGREED
THAT SERVICE UPON SUCH  ATTORNEY-IN-FACT  SHALL CONSTITUTE VALID SERVICE UPON IT
OR ITS SUCCESSORS AND ASSIGNS;

                                      - 9 -




<PAGE>




         (f) AGREES THAT ITS SUBMISSION TO  JURISDICTION  AND ITS DESIGNATION OF
THE PROCESS AGENT SET FORTH ABOVE IS MADE FOR THE EXPRESS BENEFIT OF PAYEE;

         (g) AGREES  THAT A FINAL  JUDGMENT  AGAINST IT IN ANY  ACTION,  SUIT OR
PROCEEDING SHALL BE CONCLUSIVE,  AND MAY BE ENFORCED,  IN OTHER JURISDICTIONS BY
SUIT ON THE JUDGMENT OR IN ANY OTHER MANNER PROVIDED BY LAW, A CERTIFIED OR TRUE
COPY OF WHICH FINAL JUDGMENT BEING CONCLUSIVE EVIDENCE OF THE FACT AND AMOUNT OF
ANY OF ITS LIABILITY THEREIN DESCRIBED; AND

         (h) COVENANTS AND AGREES THAT SO LONG AS THIS NOTES SHALL BE UNPAID, IT
SHALL MAINTAIN A DULY APPOINTED AGENT FOR THE SERVICE OF SUMMONS AND OTHER LEGAL
PROCESS IN HOUSTON, TEXAS, U.S.A.

         23. THIS GUARANTY AND THE OTHER LOAN DOCUMENTS, AND THE INSTRUMENTS AND
DOCUMENTS  EXECUTED  IN  CONNECTION  HEREWITH,  REPRESENTS  THE FINAL  AGREEMENT
BETWEEN  THE  PARTIES  AND  MAY  NOT  BE  CONTRADICTED  BY  EVIDENCE  OF  PRIOR,
CONTEMPORANEOUS,  OR SUBSEQUENT  ORAL  AGREEMENTS  OF THE PARTIES.  THERE ARE NO
UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.



                                     - 10 -




<PAGE>



         24.  Language.  All  notices,   communications,   evidences,   reports,
opinions,  financial  statements and other  documents given under this Guaranty,
unless  submitted in the English  language shall be accompanied by one certified
copy of an  English  translation  thereof  for  each  copy of the  foregoing  so
submitted and the English version shall govern in the event of any conflict with
the non-English version thereof.

         EXECUTED as of the 29th day of May, 1996.


                                        GUARANTOR:

                                        NORTHERN GEOPHYSICAL
                                        OF AMERICA, INC.,
                                        a Delaware corporation



                                        By:_________________________________
                                           J.D. White, Treasurer

                                        Address: 76 S. Alton Way.
                                                 Englewood, Colorado  80112
                                                 Fax No.:  (303) 290-0447
                                                 Telephone No.:  (303) 741-3700
                                                 Attention:  President


                                     - 11 -




                               GUARANTY AGREEMENT


         WHEREAS, the execution of this Guaranty Agreement is a condition to 3-D
GEOPHYSICAL,  INC., a Delaware  corporation  ("Borrower"),  borrowing money from
FIRST INTERSTATE BANK OF TEXAS, N.A., a national banking association ("Lender"),
pursuant  to that  certain  Loan  Agreement  dated as of May 26,  1996,  between
Borrower and Lender (such Loan  Agreement,  as the same may hereafter be amended
or  modified  from  time to time,  being  hereinafter  referred  to as the "Loan
Agreement");

         WHEREAS,  as of the date hereof, the Guaranteed  Indebtedness  (defined
below) includes (i) a revolving credit loan in the amount of  $3,000,000.00  and
(ii) a term loan in the original principal amount of $15,000,000.00;

         NOW, THEREFORE, for valuable consideration, the receipt and adequacy of
which are hereby acknowledged,  the undersigned,  Paragon  Geophysical,  Inc., a
Delaware  corporation (the "Guarantor"),  hereby irrevocably and unconditionally
guarantees  to  Lender  the full  and  prompt  payment  and  performance  of the
Guaranteed  Indebtedness  (hereinafter  defined),  this Guaranty Agreement being
upon the following terms:

         1. The term "Guaranteed Indebtedness", as used herein, means all of the
"Obligations" (as defined in the Loan Agreement), including, without limitation,
(i) that certain  promissory note in the original principal amount of $3,000,000
dated of even date herewith,  (ii) that certain  promissory note in the original
principal  amount of  $15,000,000.00  dated of even date  herewith,  each  being
executed by Borrower and payable to the order of Lender and (iii) all  renewals,
extensions and modifications  thereof. The term "Guaranteed  Indebtedness" shall
include  future  advances  and any and all  post-petition  interest and expenses
(including  attorneys'  fees)  whether  or not  allowed  under  any  bankruptcy,
insolvency, or other similar law.

         2. This instrument shall be an absolute,  continuing,  irrevocable, and
unconditional  guaranty  of  payment  and  performance,  and not a  guaranty  of
collection, and Guarantor shall remain liable on its obligations hereunder until
the payment and performance in full of the Guaranteed Indebtedness.  No set-off,
counterclaim,  recoupment,  reduction,  or diminution of any obligation,  or any
defense of any kind or nature  which  Borrower  may have  against  Lender or any
other party, or which Guarantor may have against Borrower,  Lender, or any other
party,  shall be available to, or shall be asserted by, Guarantor against Lender
or any subsequent  holder of the Guaranteed  Indebtedness or any part thereof or
against payment of the Guaranteed Indebtedness or any part thereof.

         3. If Guarantor  becomes liable for any indebtedness  owing by Borrower
to Lender by endorsement or otherwise, other than under this Guaranty Agreement,
such liability shall not be in any manner impaired or affected  hereby,  and the
rights of Lender  hereunder shall be cumulative of any and all other rights that
Lender may ever have against Guarantor. The




<PAGE>



exercise  by  Lender  of any  right  or  remedy  hereunder  or under  any  other
instrument,  or at law or in  equity,  shall  not  preclude  the  concurrent  or
subsequent exercise of any other right or remedy.

         4. In the event of default by Borrower in payment or performance of the
Guaranteed Indebtedness,  or any part thereof, when such Guaranteed Indebtedness
becomes due,  whether by its terms,  by  acceleration,  or otherwise,  Guarantor
shall  promptly pay the amount due thereon to Lender  without  notice or demand,
except as expressly provided for herein, in lawful currency of the United States
of America and it shall not be  necessary  for Lender,  in order to enforce such
payment by Guarantor,  first to institute  suit or exhaust its remedies  against
Borrower or others  liable on such  Guaranteed  Indebtedness,  or to enforce any
rights  against any  collateral  which shall ever have been given to secure such
Guaranteed  Indebtedness.  Notwithstanding anything to the contrary contained in
this Guaranty Agreement,  Guarantor hereby irrevocably waives any and all rights
it may  now  or  hereafter  have  under  any  agreement  or at law or in  equity
(including,  without limitation, any law subrogating the Guarantor to the rights
of Lender) to assert any claim against or seek contribution,  indemnification or
any other form of  reimbursement  from  Borrower or any other  party  liable for
payment of any or all of the  Guaranteed  Indebtedness  for any payment  made by
Guarantor under or in connection with this Guaranty Agreement or otherwise.

         5. If  acceleration  of the time for  payment of any amount  payable by
Borrower  under  the  Guaranteed  Indebtedness  is stayed  upon the  insolvency,
bankruptcy, or reorganization of Borrower, all such amounts otherwise subject to
acceleration under the terms of the Guaranteed Indebtedness shall nonetheless be
payable by Guarantor hereunder forthwith on demand by Lender.

         6.  Guarantor  hereby agrees that its  obligations  under this Guaranty
Agreement shall not be released, discharged,  diminished,  impaired, reduced, or
affected for any reason or by the  occurrence of any event,  including,  without
limitation,  one or more of the following events,  whether or not with notice to
or the  consent of  Guarantor:  (a) the taking or  accepting  of  collateral  as
security  for  any  or  all  of the  Guaranteed  Indebtedness  or  the  release,
surrender,  exchange,  or  subordination  of any  collateral  now  or  hereafter
securing any or all of the Guaranteed  Indebtedness;  (b) any partial release of
the  liability of  Guarantor  hereunder,  or the full or partial  release of any
other  guarantor from  liability for any or all of the Guaranteed  Indebtedness;
(c) any disability of Borrower, or the dissolution, insolvency, or bankruptcy of
Borrower,  Guarantor,  or any other  party at any time liable for the payment of
any  or  all  of  the  Guaranteed  Indebtedness;  (d)  any  renewal,  extension,
modification,  waiver,  amendment,  or  rearrangement  of  any  or  all  of  the
Guaranteed  Indebtedness or any instrument,  document,  or agreement evidencing,
securing,  or otherwise  relating to any or all of the Guaranteed  Indebtedness;
(e) any adjustment,  indulgence,  forbearance, waiver, or compromise that may be
granted  or given by Lender to  Borrower,  Guarantor,  or any other  party  ever
liable for any or all of the Guaranteed  Indebtedness;  (f) any neglect,  delay,
omission,  failure, or refusal of Lender to take or prosecute any action for the
collection of any of the Guaranteed Indebtedness or to

                                       -2-




<PAGE>



foreclose or take or prosecute  any action in  connection  with any  instrument,
document, or agreement evidencing, securing, or otherwise relating to any or all
of the Guaranteed Indebtedness; (g) the unenforceability or invalidity of any or
all of the Guaranteed Indebtedness or of any instrument,  document, or agreement
evidencing,  securing,  or  otherwise  relating to any or all of the  Guaranteed
Indebtedness;  (h) any  payment by Borrower or any other party to Lender is held
to constitute a preference under  applicable  bankruptcy or insolvency law or if
for any other reason  Lender is required to refund any payment or pay the amount
thereof  to  someone  else;  (i)  the  settlement  or  compromise  of any of the
Guaranteed Indebtedness; (j) the non-perfection of any security interest or lien
securing any or all of the  Guaranteed  Indebtedness;  (k) any impairment of any
collateral securing any or all of the Guaranteed  Indebtedness;  (1) the failure
of  Lender  to  sell  any  collateral  securing  any or  all  of the  Guaranteed
Indebtedness  in a commercially  reasonable  manner or as otherwise  required by
law;  (m) any change in the  corporate  existence,  structure,  or  ownership of
Borrower;  or (n) any other  circumstance  which might  otherwise  constitute  a
defense available to, or discharge of, Borrower or Guarantor.

         7. Guarantor represents and warrants to Lender as follows:

              (a) Guarantor is a corporation  duly organized,  validly  existing
         and  in  good  standing  under  the  laws  of the  jurisdiction  of its
         incorporation,  is  qualified  to do business in all  jurisdictions  in
         which  the  nature  of  the   business   conducted  by  it  makes  such
         qualification  necessary  and where  failure to so qualify would have a
         material  adverse  effect  on its  business,  financial  condition,  or
         operations.

              (b)  Guarantor  has the  corporate  power and  authority and legal
         right to  execute,  deliver,  and perform  its  obligations  under this
         Guaranty Agreement and this Guaranty  Agreement  constitutes the legal,
         valid,  and  binding  obligation  of  Guarantor,   enforceable  against
         Guarantor in accordance with its respective terms, except as limited by
         bankruptcy,  insolvency,  or other laws of general application relating
         to the enforcement of creditor's rights.

              (c) The execution,  delivery, and performance by Guarantor of this
         Guaranty Agreement have been duly authorized by all requisite action on
         the part of Guarantor  and do not and will not violate or conflict with
         the articles of  incorporation or bylaws of Guarantor or any law, rule,
         or  regulation or any order,  writ,  injunction or decree of any court,
         governmental authority or agency, or arbitrator and do not and will not
         conflict with, result in a breach of, or constitute a default under, or
         result  in the  imposition  of any lien upon any  assets  of  Guarantor
         pursuant to the provisions of any indenture,  mortgage,  deed of trust,
         security agreement,  franchise, permit, license, or other instrument or
         agreement to which Guarantor or its properties is bound.

              (d) No  authorization,  approval,  or consent of, and no filing or
         registration with, any court, governmental authority, or third party is
         necessary for the execution,

                                       -3-




<PAGE>



         delivery or performance by Guarantor of this Guaranty  Agreement or the
         validity or enforceability thereof.

              (e) The value of the consideration  received and to be received by
         Guarantor  as a result of Borrower  and Lender  entering  into the Loan
         Agreement  and  Guarantor   executing  and  delivering   this  Guaranty
         Agreement is  reasonably  worth at least as much as the  liability  and
         obligation of Guarantor  hereunder,  and such  liability and obligation
         and the Loan Agreement have benefited and may reasonably be expected to
         benefit Guarantor directly or indirectly.

              (f) Guarantor has,  independently and without reliance upon Lender
         and based upon such  documents and  information as Guarantor has deemed
         appropriate,  made its own  analysis  and  decision  to enter into this
         Guaranty Agreement.

              (g) Guarantor hereby represents that (i) it is not insolvent as of
         the date hereof and will not be rendered  insolvent as a result of this
         Guaranty   Agreement,   (ii)  it  is  not  engaged  in  business  or  a
         transaction,  or about to engage in a business  or a  transaction,  for
         which  any  property  or  assets   remaining  with  such  Guarantor  is
         unreasonably  small capital,  and (iii) it does not intend to incur, or
         believe it will incur,  debts that will be beyond its ability to pay as
         such debts mature.

         8.  Guarantor  covenants  and agrees  that,  as long as the  Guaranteed
Indebtedness  or any part thereof is  outstanding  or Lender has any  commitment
under the Loan Agreement:

              (a) Guarantor  will furnish  promptly to Lender  written notice of
         the  occurrence  of any  default  under this  Guaranty  Agreement  or a
         Default under the Loan Agreement of which Guarantor has knowledge.

              (b)  Guarantor  will  furnish  promptly to Lender such  additional
         information concerning Guarantor as Lender may request.

              (c)  Guarantor  will  obtain at any time and from time to time all
         authorization,   licenses,  consents  or  approvals  as  shall  now  or
         hereafter  be  necessary  or  desirable  under all  applicable  laws or
         regulations or otherwise in connection with the execution, delivery and
         performance of this Guaranty Agreement and will promptly furnish copies
         thereof to Lender.

         9. (a) Guarantor hereby agrees that the  Subordinated  Indebtedness (as
hereinafter  defined) shall be subordinate and junior in right of payment to the
prior  payment in full of all  Guaranteed  Indebtedness,  and  Guarantor  hereby
assigns the  Subordinated  Indebtedness to Lender as security for the Guaranteed
Indebtedness.  If any sums shall be paid to  Guarantor  by Borrower or any other
person or entity on account of the Subordinated Indebtedness, such sums shall be
held in trust by Guarantor for the

                                       -4-




<PAGE>



benefit of Lender and shall  forthwith be paid to Lender  without  affecting the
liability  of  Guarantor  under this  Guaranty  Agreement  and may be applied by
Lender  against the Guaranteed  Indebtedness  in such order and manner as Lender
may  determine  in its sole  discretion.  Upon the request of Lender,  Guarantor
shall execute,  deliver, and endorse to Lender such documents and instruments as
Lender may request to perfect,  preserve, and enforce its rights hereunder.  For
purposes of this Guaranty Agreement, the term "Subordinated  Indebtedness" means
all indebtedness, liabilities, and obligations of Borrower to Guarantor, whether
such  indebtedness,  liabilities,  and  obligations  now exist or are  hereafter
incurred or arise,  or whether the  obligations of Borrower  thereon are direct,
indirect,  contingent,  primary,  secondary,  several,  joint  and  several,  or
otherwise,  and  irrespective  of whether  such  indebtedness,  liabilities,  or
obligations are evidenced by a note, contract,  open account, or otherwise,  and
irrespective  of the  person  or  persons  in  whose  favor  such  indebtedness,
obligations, or liabilities may, at their inception, have been, or may hereafter
be created,  or the manner in which they have been or may  hereafter be acquired
by Guarantor.

         (b)  Guarantor  agrees  that  any and all  liens,  security  interests,
judgment liens,  charges,  or other encumbrances upon Borrower's assets securing
payment  of any  Subordinated  Indebtedness  shall be and  remain  inferior  and
subordinate to any and all liens,  security interests,  judgment liens, charges,
or other  encumbrances upon Borrower's assets securing payment of the Guaranteed
Indebtedness  or any part thereof,  regardless of whether such  encumbrances  in
favor of  Guarantor  or  Lender  presently  exist or are  hereafter  created  or
attached.  Without the prior written consent of Lender,  Guarantor shall not (i)
file suit against  Borrower or exercise or enforce any other creditor's right it
may have against Borrower, or (ii) foreclose, repossess, sequester, or otherwise
take  steps or  institute  any action or  proceedings  (judicial  or  otherwise,
including   without   limitation  the   commencement  of,  or  joinder  in,  any
liquidation,   bankruptcy,   rearrangement,   debtor's   relief  or   insolvency
proceeding)  to  enforce  any  liens,  security  interests,  collateral  rights,
judgments or other encumbrances held by Guarantor on assets of Borrower.

         (c)  In the  event  of any  receivership,  bankruptcy,  reorganization,
rearrangement,   debtor's  relief,  or  other  insolvency  proceeding  involving
Borrower  as  debtor,  Lender  shall  have the right to prove and vote any claim
under the  Subordinated  Indebtedness and to receive directly from the receiver,
trustee or other court custodian all dividends, distributions, and payments made
in  respect  of  the  Subordinated  Indebtedness.  Lender  may  apply  any  such
dividends,  distributions,  and payments against the Guaranteed  Indebtedness in
such order and manner as Lender may determine in its sole discretion.

         (d) Guarantor agrees that all promissory  notes,  accounts  receivable,
ledgers,  records,  or any other  evidence of  Subordinated  Indebtedness  shall
contain a specific

                                       -5-




<PAGE>



written notice thereon that the indebtedness  evidenced  thereby is subordinated
under the terms of this Guaranty Agreement.

         10. No amendment or waiver of any provision of this Guaranty  Agreement
or consent to any  departure by the  Guarantor  therefrom  shall in any event be
effective  unless the same shall be in writing and signed by Lender.  No failure
on the part of Lender to exercise, and no delay in exercising, any right, power,
or privilege  hereunder shall operate as a waiver thereof;  nor shall any single
or partial  exercise of any right,  power, or privilege  hereunder  preclude any
other or further exercise thereof or the exercise of any other right,  power, or
privilege.  The remedies herein provided are cumulative and not exclusive of any
remedies provided by law.

         11. Any acknowledgment or new promise,  whether by payment of principal
or  interest  or  otherwise  and  whether  by  Borrower  or  others   (including
Guarantor),  with respect to any of the Guaranteed  Indebtedness  shall,  if the
statute of limitations in favor of Guarantor against Lender shall have commenced
to run,  toll the running of such statute of  limitations  and, if the period of
such statute of  limitations  shall have expired,  prevent the operation of such
statute of limitations.

         12.  This  Guaranty  Agreement  is for the  benefit  of Lender  and its
successors  and assigns,  and in the event of an  assignment  of the  Guaranteed
Indebtedness,  or any part thereof,  the rights and benefits  hereunder,  to the
extent applicable to the indebtedness so assigned,  may be transferred with such
indebtedness.  This Guaranty Agreement is binding not only on Guarantor,  but on
Guarantor's successors and assigns.

         13.  Guarantor  recognizes  that Lender is relying  upon this  Guaranty
Agreement and the  undertakings of Guarantor  hereunder in making  extensions of
credit to Borrower  under the Loan  Agreement  and further  recognizes  that the
execution  and delivery of this Guaranty  Agreement is a material  inducement to
Lender in entering into the Loan Agreement.  Guarantor hereby  acknowledges that
there are no conditions to the full effectiveness of this Guaranty Agreement.

         14 This Guaranty  Agreement is executed and delivered as an incident to
a lending transaction negotiated, consummated, and performable in Harris County,
Texas, and shall be governed by and construed in accordance with the laws of the
State  of  Texas.  Any  action  or  proceeding  against  Guarantor  under  or in
connection  with this Guaranty  Agreement may be brought in any state or federal
court in Harris County,  Texas.  Guarantor hereby irrevocably (i) submits to the
nonexclusive  jurisdiction of such courts,  and (ii) waives any objection it may
now or hereafter  have as to the venue of any such action or proceeding  brought
in such court or that such court is an inconvenient forum. Guarantor agrees that
service of process upon it may be made by certified or registered  mail,  return
receipt requested,  at its address specified below.  Nothing herein shall affect
the right of Lender to serve  process in any other  matter  permitted  by law or
shall  limit  the right of Lender  to bring  any  action or  proceeding  against
Guarantor  or with  respect to any of  Guarantor's  property  in courts in other
jurisdictions. Any

                                       -6-




<PAGE>



action or  proceeding  by  Guarantor  against  Lender shall be brought only in a
court located in Harris County, Texas.

         15.  Guarantor  shall pay on demand all  attorneys'  fees and all other
costs  and  expenses  incurred  by Lender in  connection  with the  preparation,
administration, enforcement, or collection of this Guaranty Agreement.

         16. Except as expressly  provided for herein,  Guarantor  hereby waives
promptness,  diligence, notice of any default under the Guaranteed Indebtedness,
demand of payment, notice of acceptance of this Guaranty Agreement, presentment,
notice of protest, notice of dishonor, notice of intent to accelerate, notice of
acceleration,  notice of the incurring by Borrower of  additional  indebtedness,
and all other  notices and demands with respect to the  Guaranteed  Indebtedness
and this Guaranty  Agreement.  Without limiting the generality of the foregoing,
Guarantor  unconditionally waives, to the extent permitted by law, (a) notice of
any of the matters  referred to in Section 6 above, (b) all notices which may be
required by statute,  rule of law or otherwise,  now or hereafter in effect,  to
preserve intact any rights against Guarantor, including, without limitation, any
demand, presentment and protest, proof of notice of non-payment under any of the
Loan  Documents and notice of any Event of Default or any failure on the part of
Borrower,  Guarantor  or any other  guarantor of the  Obligations  to perform or
comply  with  any  covenant,  agreement,  term or  condition  of any of the Loan
Documents,  (b) any right to the  enforcement,  assertion  or  exercise  against
Borrower, Guarantor or any other guarantor of the Obligations and the Guaranteed
Indebtedness,  as applicable,  of any right or remedy conferred under any of the
Loan Documents,  (d) any requirement of diligence on the part of any Person, (e)
any  requirement  to exhaust any remedies or to mitigate  the damages  resulting
from any default  under any of the Loan  Documents,  (f) any notice of any sale,
transfer or other  disposition  of any right,  title or interest of Lender under
any of the Loan Documents and (g) any rights of Guarantor pursuant to Chapter 34
of the Texas Business and Commerce Code, as amended.

         17. The Loan Agreement,  and all of the terms thereof, are incorporated
herein by reference, the same as if stated verbatim herein, and Guarantor agrees
that  Lender  may  exercise  any and all  rights  granted  to it under  the Loan
Agreement  and the other  Loan  Documents  (as  defined  in the Loan  Agreement)
without affecting the validity or enforceability of this Guaranty Agreement.

         18. Guarantor  hereby  represents and warrants to Lender that Guarantor
has adequate  means to obtain from  Borrower on a continuing  basis  information
concerning the financial  condition and assets of Borrower and that Guarantor is
not relying  upon Lender to provide  (and Lender  shall have no duty to provide)
any such information to, Guarantor either now or in the future.

         19. THIS GUARANTY  AGREEMENT  EMBODIES THE FINAL,  ENTIRE  AGREEMENT OF
GUARANTOR AND LENDER WITH RESPECT TO GUARANTOR'S

                                       -7-




<PAGE>



GUARANTY  OF THE  GUARANTEED  INDEBTEDNESS  AND  SUPERSEDES  ANY AND  ALL  PRIOR
COMMITMENTS, AGREEMENTS, REPRESENTATIONS, AND UNDERSTANDINGS, WHETHER WRITTEN OR
ORAL, RELATING TO THE SUBJECT MATTER HEREOF. THIS GUARANTY AGREEMENT IS INTENDED
BY GUARANTOR  AND LENDER AS A FINAL AND COMPLETE  EXPRESSION OF THE TERMS OF THE
GUARANTY  AGREEMENT,  AND NO COURSE OF DEALING BETWEEN  GUARANTOR AND LENDER, NO
COURSE  OF  PERFORMANCE,   NO  TRADE   PRACTICES,   AND  NO  EVIDENCE  OF  PRIOR
CONTEMPORANEOUS  OR SUBSEQUENT ORAL AGREEMENTS OR DISCUSSIONS OR OTHER EXTRINSIC
EVIDENCE OF ANY NATURE SHALL BE USED TO CONTRADICT,  VARY,  SUPPLEMENT OR MODIFY
ANY  TERM OF THIS  GUARANTY  AGREEMENT.  THERE  ARE NO ORAL  AGREEMENTS  BETWEEN
GUARANTOR AND LENDER.

         20. THE PARTIES  AGREE TO BE BOUND BY THE TERMS AND  CONDITIONS  OF THE
CURRENT ARBITRATION PROGRAM OF LENDER, WHICH IS INCORPORATED HEREIN BY REFERENCE
AND  ACKNOWLEDGED  AS  RECEIVED  BY THE  PARTIES  PURSUANT  TO WHICH ANY AND ALL
DISPUTES SHALL BE RESOLVED BY MANDATORY BINDING  ARBITRATION UPON THE REQUEST OF
ANY PARTY.

         21. (a) All payments  payable  hereunder  in respect of the  Guaranteed
Obligations  shall be payable by  Guarantor  to  Beneficiary  in the currency in
which the  Guaranteed  Obligations  are expressed  (herein  called the "Required
Currency"). The obligation of Guarantor to make payment in the Required Currency
shall not be discharged  or satisfied by any payment or tender,  or any recovery
pursuant to any judgment or order, which is or is expressed in or converted into
any  currency  other  than the  Required  Currency,  except to the  extent  such
payment, tender or recovery shall result in the actual receipt by Beneficiary of
the full amount of the  Required  Currency  expressed  to be payable  hereunder.
Without  limiting  the  generality  of  the  foregoing,   Guarantor   authorizes
Beneficiary,  on any  payment,  tender or recovery in a currency  other than the
Required  Currency,  to  purchase  in  accordance  with its  normal  procedures,
Required  Currency  with the  amount  of such  other  currency  so  tendered  or
recovered. The obligation of Guarantor to make payments in the Required Currency
shall be enforceable  as an  alternative  or additional  cause of action for the
purpose of  recovery  in the  Required  Currency of the amount (if any) by which
such actual  receipt shall fall short of the full amount due hereunder and shall
not be  affected by judgment  being  obtained  for any other sums due under this
Guaranty.

         (b) All payments  made to  Beneficiary  hereunder  shall be made in the
Required  Currency  for value on the day on which  payment is due,  without  any
setoff or counterclaim,  free and clear of and without  deduction or withholding
for or on account of, any present or future  Taxes now or  hereafter  imposed by
any  governmental  or other  authority.  As used herein,  the term "Taxes" shall
include  all  withholding,  income,  gains,  excise,  stamp and  other  taxes of
whatever nature as well as all withholding,  levies, imports, duties, charges or
fees of whatever

                                       -8-




<PAGE>



nature.  If  Guarantor  is  compelled  by law to make  any  such  deductions  or
withholdings,  it will pay such additional  amounts as may be necessary in order
that the net amount received and retained by Beneficiary after such deduction or
withholdings (including any required deduction or withholding on such additional
amounts)  shall equal the amount it would have received and retained had no such
deductions  or  withholdings  been  required  to be  made,  and it will  provide
Beneficiary  with evidence  satisfactory  to  Beneficiary  that it has paid such
deduction or withholdings.  Guarantor hereby agrees to indemnify Beneficiary and
hold it harmless against all losses,  costs,  expenses or other amounts incurred
or suffered by  Beneficiary by reason of the failure of Guarantor to perform its
obligations under this clause (b).

         22. WITH RESPECT TO ANY AND ALL DISPUTES ARISING  HEREUNDER,  UNDER THE
NOTES,  UNDER  THE  OTHER  GUARANTEED  OBLIGATIONS,  OR UNDER  ANY OF THE  OTHER
INSTRUMENTS  AND  DOCUMENTS  EXECUTED IN  CONNECTION  HEREWITH OR THEREWITH  NOT
SETTLED  OR  SUBJECT  TO  ARBITRATION,   PURSUANT  TO  ANY  ARBITRATION  PROGRAM
REFERENCED TO HEREIN, GUARANTOR HEREBY IRREVOCABLY AND UNCONDITIONALLY:

         (a)  SUBMITS  FOR  ITSELF  AND ITS  PROPERTY  IN ANY  LEGAL  ACTION  OR
PROCEEDING  RELATING TO THIS  GUARANTY  AND ANY OTHER  DOCUMENT TO WHICH IT IS A
PARTY,  OR FOR  RECOGNITION  AND  ENFORCEMENT  OF ANY JUDGMENT IN RESPECT OF ANY
THEREOF, TO THE NON-EXCLUSIVE GENERAL JURISDICTION OF THE COURTS OF THE STATE OF
TEXAS,  THE COURTS OF THE UNITED STATES OF AMERICA FOR THE SOUTHERN  DISTRICT OF
TEXAS, AND APPELLATE COURTS FROM ANY THEREOF;

         (b) CONSENTS THAT ANY SUCH ACTION OR PROCEEDING  MAY BE BROUGHT IN SUCH
COURTS,  AND WAIVES ANY OBJECTION THAT IT MAY NOW OR HEREAFTER HAVE TO THE VENUE
OF ANY SUCH  ACTION  OR  PROCEEDING  IN ANY SUCH  COURT OR THAT  SUCH  ACTION OR
PROCEEDING WAS BROUGHT IN AN IMPROPER VENUE OR AN INCONVENIENT  COURT AND AGREES
NOT TO PLEAD OR CLAIM THE SAME;

         (c) AGREES THAT SERVICE OF PROCESS IN ANY SUCH ACTION OR PROCEEDING MAY
BE EFFECTED BY MAILING A COPY THEREOF BY  REGISTERED  OR CERTIFIED  MAIL (OR ANY
SUBSTANTIALLY  SIMILAR  FORM OF MAIL),  POSTAGE  PREPAID,  TO IT AT ITS  ADDRESS
SPECIFIED ON THE SIGNATURE PAGE HEREOF;

         (d) AGREES THAT NOTHING HEREIN SHALL AFFECT THE RIGHT TO EFFECT SERVICE
OF PROCESS IN ANY OTHER MANNER  PERMITTED BY LAW OR SHALL LIMIT THE RIGHT TO SUE
IN ANY OTHER JURISDICTION;


                                       -9-




<PAGE>



         (e) DESIGNATES AND APPOINTS MIKE WEBB,  WHOSE OFFICE ON THE DATE HEREOF
IS 1990 POST OAK BLVD., SUITE 1670, HOUSTON, TEXAS 77056 (HEREINAFTER CALLED THE
"PROCESS AGENT"),  AS ITS  ATTORNEY-IN-FACT  IN THE UNITED STATES OF AMERICA, TO
RECEIVE  SERVICE OF PROCESS IN ANY ACTION,  SUIT OR PROCEEDING,  IT BEING AGREED
THAT SERVICE UPON SUCH  ATTORNEY-IN-FACT  SHALL CONSTITUTE VALID SERVICE UPON IT
OR ITS SUCCESSORS AND ASSIGNS;

         (f) AGREES THAT ITS SUBMISSION TO  JURISDICTION  AND ITS DESIGNATION OF
THE PROCESS AGENT SET FORTH ABOVE IS MADE FOR THE EXPRESS BENEFIT OF PAYEE;

         (g) AGREES  THAT A FINAL  JUDGMENT  AGAINST IT IN ANY  ACTION,  SUIT OR
PROCEEDING SHALL BE CONCLUSIVE,  AND MAY BE ENFORCED,  IN OTHER JURISDICTIONS BY
SUIT ON THE JUDGMENT OR IN ANY OTHER MANNER PROVIDED BY LAW, A CERTIFIED OR TRUE
COPY OF WHICH FINAL JUDGMENT BEING CONCLUSIVE EVIDENCE OF THE FACT AND AMOUNT OF
ANY OF ITS LIABILITY THEREIN DESCRIBED; AND

         (h) COVENANTS AND AGREES THAT SO LONG AS THIS NOTES SHALL BE UNPAID, IT
SHALL MAINTAIN A DULY APPOINTED AGENT FOR THE SERVICE OF SUMMONS AND OTHER LEGAL
PROCESS IN HOUSTON, TEXAS, U.SA.

         23. THIS GUARANTY AND THE OTHER LOAN  DOCUMENTS,  AND THE  INSTRUMENTS'
AND DOCUMENTS  EXECUTED IN CONNECTION  HEREWITH,  REPRESENTS THE FINAL AGREEMENT
BETWEEN  THE  PARTIES  AND  MAY  NOT  BE  CONTRADICTED  BY  EVIDENCE  OF  PRIOR,
CONTEMPORANEOUS,  OR SUBSEQUENT  ORAL  AGREEMENTS  OF THE PARTIES.  THERE ARE NO
UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.


                                      -10-




<PAGE>



         24.  Language.  All  notices,   communications,   evidences,   reports,
opinions,  financial  statements and other  documents given under this Guaranty,
unless  submitted in the English  language shall be accompanied by one certified
copy of an  English  translation  thereof  for  each  copy of the  foregoing  so
submitted and the English version shall govern in the event of any conflict with
the non-English version thereof.

         EXECUTED as of the 29th day of May, 1996.


                                       GUARANTOR:

                                       PARAGON GEOPHYSICAL, INC., a
                                       Delaware corporation



                                       By: _______________________________
                                           J.D. White, Treasurer

                                       Address: 7076 S. Alton Way
                                                Englewood, Colorado  80112
                                                Fax No.:  (303) 290-0447
                                                Telephone No.:  (303) 741-3700
                                                Attention:  President


                                      -11-




                               GUARANTY AGREEMENT


         WHEREAS, the execution of this Guaranty Agreement is a condition to 3-D
GEOPHYSICAL,  INC., a Delaware  corporation  ("Borrower"),  borrowing money from
FIRST  INTERSTATE  BANK  OR  TEXAS,  N.  A.,  a  national  banking   association
("Lender"),  pursuant to that certain Loan  Agreement  dated as of May 29, 1996,
between  Borrower and Lender (such Loan Agreement,  as the same may hereafter be
amended or  modified  from time to time,  being  hereinafter  referred to as the
"Loan Agreement");

         WHEREAS,  as of the date hereof, the Guaranteed  Indebtedness  (defined
below) includes (i) a revolving credit loan in the amount of  $3,000,000.00  and
(ii) a term loan in the original principal amount of $15,000,000.00;

         NOW, THEREFORE, for valuable consideration, the receipt and adequacy of
which are hereby acknowledged, the undersigned,  Geoevaluaciones, S. A. de C. V.
a Mexican corporation,  the address of which is Ave. Rio Churubusco 522, Col. El
Retono,   09440  Mexico  City  (the   "Guarantor"),   hereby   irrevocably   and
unconditionally guarantees to Lender the full and prompt payment and performance
of the Guaranteed  Indebtedness  (hereinafter defined),  this Guaranty Agreement
being upon the following terms:

         1. The term "Guaranteed Indebtedness", as used herein, means all of the
"Obligations" (as defined in the Loan Agreement), including, without limitation,
(i) that certain  promissory note in the original principal amount of $3,000,000
dated of even date herewith,  (ii) that certain  promissory note in the original
principal  amount of  $15,000,000.00  dated of even date  herewith,  each  being
executed by Borrower and payable to the order of Lender and (iii) all  renewals,
extensions and modifications  thereof. The term "Guaranteed  Indebtedness" shall
include  future  advances  and any and all  post-petition  interest and expenses
(including  attorneys'  fees)  whether  or not  allowed  under  any  bankruptcy,
insolvency or other similar law.

         2. This instrument shall be an absolute,  continuing,  irrevocable, and
unconditional  guaranty  of  payment  and  performance,  and not a  guaranty  of
collection,  and Guarantor shall remain liable on its obligations herewith until
the payment and performance in full of the Guaranteed Indebtedness.  No set-off,
counterclaim,  recoupment,  reduction,  or diminution of any obligation,  or any
defense of any kind or nature which  Borrower  may have against  Lender or other
party, or which Guarantor may have against Borrower,  Lender or any other party,
shall be available to, or shall be asserted by, Guarantor  against Lender or any
subsequent holder of the Guaranteed  Indebtedness or any part thereof or against
payment of the Guaranteed Indebtedness or any part thereof.

         3. If Guarantor  becomes liable for any indebtedness  owing by Borrower
to Lender by endorsement or otherwise, other than under this Guaranty Agreement,
such liability shall not be in any manner impaired or affected  hereby,  and the
rights of Lender hereunder shall be




<PAGE>



cumulative  of any and all  other  rights  that  Lender  may ever  have  against
Guarantor.  The exercise by Lender of any right or remedy hereunder or under any
other instrument,  or at law or in equity,  shall not preclude the concurrent or
subsequent exercise of any other right or remedy.

         4. In the event of default by Borrower in payment of performance of the
Guaranteed Indebtedness,  or any part thereof, when such Guaranteed Indebtedness
becomes due,  whether by its terms,  by  acceleration,  or otherwise,  Guarantor
shall  promptly pay the amount due,  thereon to Lender without notice or demand,
except as expressly provided for herein, in lawful currency of the United States
of America and it shall not be  necessary  for Lender,  in order to enforce such
payment by Guarantor,  first to institute  suit or exhaust its remedies  against
Borrower or others  liable on such  Guaranteed  Indebtedness,  or to enforce any
rights against any collateral which liable on such Guaranteed  Indebtedness,  or
to enforce any rights against any collateral which shall ever have been given to
secure such Guaranteed  Indebtedness.  Notwithstanding  anything to the contrary
contained in this Guaranty  Agreement,  Guarantor hereby  irrevocably waives any
and all rights it may now or hereafter  have under any agreement or at law or in
equity (including,  without limitation, any law subrogating the Guarantor to the
rights  of  Lender)  to  assert   any  claim   against  or  seek   contribution,
indemnification  or any other form of  reimbursement  from Borrower or any other
party liable for payment of any or all of the  Guaranteed  Indebtedness  for any
payment made by Guarantor under or in connection with this Guaranty Agreement or
otherwise.

         5. If  acceleration  of the time form payment of any amount  payable by
Borrower  under  the  Guaranteed  Indebtedness  is stayed  upon the  insolvency,
bankruptcy, or reorganization of Borrower, all such amounts otherwise subject to
acceleration under the terms of the Guaranteed Indebtedness shall nonetheless be
payable by Guarantor hereunder forthwith on demand by Lender.

         6.  Guarantor  hereby agrees that its  obligations  under this Guaranty
Agreement shall not be released, discharged,  diminished,  impaired, reduced, or
affected for any reason or by the  occurrence of any event,  including,  without
limitation,  one or more of the following events,  whether or not with notice to
or the  consent of  Guarantor:  (a) the taking or  accepting  of  collateral  as
securing  for  any  or  all  of the  Guaranteed  Indebtedness  or  the  release,
surrender,  exchange,  or  subordination  of any  collateral  now  or  hereafter
succoring any or all of the Guaranteed Indebtedness;  (b) any partial release of
the  liability of  Guarantor  hereunder,  or the full or partial  release of any
other  guarantor from  liability for any or all of the Guaranteed  Indebtedness;
(c) any disability of Borrower, or the dissolution, insolvency, or bankruptcy of
Borrower,  Guarantor,  or any other  party at any time liable for the payment of
any  or  all  of  the  Guaranteed  Indebtedness;  (d)  any  renewal,  extension,
modification,  waiver,  amendment,  or  rearrangement  of  any  or  all  of  the
Guaranteed  Indebtedness or any instrument,  document,  or agreement evidencing,
securing,  or otherwise  relating to any or all to the Guaranteed  Indebtedness;
(e) any adjustment,  indulgence,  forbearance,  waiver or compromise that may be
granted  or given by Lender to  Borrower,  Guarantor,  or any other  party  ever
liable for any or

                                       -2-




<PAGE>



all of the Guaranteed Indebtedness;  (f) any neglect, delay, omission,  failure,
or refusal of Lender to take or prosecute  any action for the  collection of any
of the Guaranteed  Indebtedness  or to foreclose or take or prosecute any action
in connection with any instrument,  document, or agreement evidencing, securing,
or  otherwise  relating to any or all of the  Guaranteed  Indebtedness;  (g) the
unenforceablity or invalidity of any or all of the Guaranteed Indebtedness;  (h)
any payment by Borrower  or any other  party to Lender is held to  constitute  a
preference  under  applicable  bankruptcy or insolvency  law or if for any other
reason  Lender is required  to refund any  payment or pay the amount  thereof to
someone  else;  (i)  the  settlement  or  compromise  of any  of the  Guaranteed
Indebtedness;  (j) the  non-perfection of any security interest or lien securing
any or all of the Guaranteed Indebtedness;  (k) any impairment of any collateral
securing any or all of the Guaranteed Indebtedness; (l) the failure of Lender to
sell any  collateral  securing any or all of the  Guaranteed  Indebtedness  in a
commercially  reasonable manner or as otherwise  required by law; (m) any change
in the corporate existence, structure, or ownership of Borrower or (n) any other
circumstance  which  might  otherwise  constitute  a  defense  available  to, or
discharge of, Borrower or Guarantor.

         7. Guarantor represents and warrants to Lender as follows:

            (a) Guarantor is a corporation duly organized,  validly existing and
in good standing under the laws of the  jurisdiction  of its  incorporation,  is
qualified  to do  business  in all  jurisdictions  in which  the  nature  of the
business conducted by it makes such qualification necessary and where failure to
so qualify  would  have a material  adverse  effect on its  business,  financial
condition, or operations.

            (b) Guarantor has the corporate  power and authority and legal right
to execute,  deliver,  and perform its obligations under this Guaranty Agreement
and this Guaranty Agreement  constitutes the legal, valid and binding obligation
of Guarantor,  enforceable  against  Guarantor in accordance with its respective
terms,  except as limited by  bankruptcy,  insolvency,  or other laws of general
application relating to the enforcement or creditor's rights.

            (c) The execution,  delivery,  and  performance by Guarantor of this
Guaranty Agreement have been duly authorized by all requisite action on the part
of  Guarantor  and do not and will not violate or conflict  with the articles of
incorporation  or bylaws of Guarantor or any law,  rule,  or  regulation  or any
order, writ, induction or decree of any court, governmental authority or agency,
or  arbitrator  and do not and will not conflict  with,  result in breach of, or
constitute a default  under,  or result in the  imposition  or any lien upon any
assets of Guarantor pursuant to the provisions of any indenture,  mortgage, deed
of trust, security agreement, franchise, permit, license, or other instrument or
agreement to which Guarantor or its properties is bound.

            (d) No  authorization,  approval,  or  consent  of, and no filing or
registration  with,  any  court,  governmental  authority,  or  third  party  is
necessary  for the  execution,  delivery or  performance  by  Guarantor  of this
Guaranty Agreement or the validity or enforceability thereof.


                                       -3-




<PAGE>



            (e) The value of the  consideration  received  and to be received by
Guarantor as a result of Borrower and Lender  entering  into the Loan  Agreement
and Guarantor  executing and  delivering  this Guaranty  Agreement is reasonably
worth at least as much as the liability and  obligation of Guarantor  hereunder,
and such  liability and obligation and the Loan Agreement have benefited and may
reasonably be expected to benefit Guarantor directly or indirectly.

            (f) Guarantor has,  independently  and without  reliance upon Lender
and  based  upon  such  documents  and   information  as  Guarantor  has  deemed
appropriate,  made its own  analysis  and  decision to enter into this  Guaranty
Agreement.

            (g) Guarantor  hereby  represents that (i) it is not insolvent as of
the date hereof and will not be rendered  insolvent as a result of this Guaranty
Agreement,  (ii) it is not  engaged in business  or a  transaction,  or about to
engage in business or a transaction,  for which any property or assets remaining
with such Guarantor is unreasonably small capital,  and (iii) it does not intend
to incur, or believe it will incur, debts that will be beyond its ability to pay
as such debts mature.

         8.  Guarantor  covenants  and agrees  that,  as long as the  Guaranteed
Indebtedness  or any part thereof is  outstanding  or Lender has any  commitment
under the Loan Agreement:

            (a) Guarantor will furnish  promptly to Lender written notice of the
occurrence of any default  under this Guaranty  Agreement or a Default under the
Loan Agreement of which Guarantor has knowledge.

            (b)  Guarantor  will  furnish  promptly  to Lender  such  additional
information concerning Guarantor as Lender may request.

            (c)  Guarantor  will  obtain  at any time and from  time to time all
authorizations,  licenses,  consents or  approvals  as shall now or hereafter be
necessary or desirable  under all applicable laws or regulations or otherwise in
connection  with  the  execution,  delivery  and  performance  of this  Guaranty
Agreement and will promptly furnish copies thereof to Lender.

         9. (a) Guarantor hereby agrees that the  Subordinated  Indebtedness (as
hereinafter  defined) shall be subordinate and junior in right of payment to the
prior  payment in full of all  Guaranteed  Indebtedness,  and  Guarantor  hereby
assigns the  Subordinated  Indebtedness to Lender as security for the Guaranteed
Indebtedness.  If any sums shall be paid to  Guarantor by Borrower or any or any
other person or entity on account of the  Subordinated  Indebtedness,  such sums
shall be held in  trust  by  Guarantor  for the  benefit  of  Lender  and  shall
forthwith be paid to Lender without  affecting the liability of Guarantor  under
this  Guaranty  Agreement  and may be applied by Lender  against the  Guaranteed
Indebtedness  in such  order  and  manner as Lender  may  determine  in its sole
discretion.  Upon the request of Lender  Guarantor  shall  execute,  deliver and
endorse to Lender  such  documents  and  instruments  as Lender  may  request to
perfect,

                                       -4-




<PAGE>



preserve,  and  enforce its rights  hereunder.  For  purposes  of this  Guaranty
Agreement,   the  term  "Subordinated   Indebtedness"  means  all  indebtedness,
liabilities and obligations of Borrower to Guarantor whether such  indebtedness,
liabilities  and  obligations  now exist or are hereafter  incurred or arise, or
whether the obligations of Borrower  thereon are direct,  indirect,  contingent,
primary,  secondary,  several, joint and several, or otherwise, and irrespective
of whether such  indebtedness,  liabilities,  or obligations  are evidenced by a
note,  contract,  open account, or otherwise,  and irrespective of the person or
persons in whose favor such  indebtedness,  obligations,  or liabilities may, at
their inception,  have been, or may hereafter be created, or the manner in which
they have been or may hereafter be acquired by Guarantor.

            (b)  Guarantor  agrees that any and all liens,  security  interests,
judgment liens,  charges,  or other encumbrances upon Borrower's assets securing
payment  of any  Subordinated  Indebtedness  shall be and  remain  inferior  and
subordinate to any and all liens,  security interests,  judgment liens, charges,
or other  encumbrances upon Borrower's assets securing payment of the Guaranteed
Indebtedness  or any part thereof,  regardless of whether such  encumbrances  in
favor of  Guarantor  or  Lender  presently  exist or are  hereafter  created  or
attached.  Without the prior written consent of Lender,  Guarantor shall not (i)
file suit against  Borrower or exercise or enforce any other creditor's right it
may have against Borrower, or (ii) foreclose, repossess, sequester, or otherwise
take  steps or  institute  any action or  proceedings  (judicial  or  otherwise,
including   without   limitation  the   commencement  of,  or  joinder  in,  any
liquidation,   bankruptcy,   rearrangement,   debtor's   relief  or   insolvency
proceeding)  to  enforce  any  liens,  security  interests,  collateral  rights,
judgments or other encumbrances held by Guarantor on assets of Borrower.

            (c) In the event of any  receivership,  bankruptcy,  reorganization,
rearrangement,   debtor's  relief,  or  other  insolvency  proceeding  involving
Borrower  as  debtor,  Lender  shall  have the right to prove and vote any claim
under the  Subordinated  Indebtedness and to receive directly from the receiver,
trustee or other court custodian all dividends, distributions, and payments made
in  respect  of  the  Subordinated  Indebtedness.  Lender  may  apply  any  such
dividends,  distributions,  and payments against the Guaranteed  Indebtedness in
such order and manner as Lender may determine in its sole discretion.

            (d) Guarantor agrees that all promissory notes, accounts receivable,
ledgers,  records,  or any other  evidence of  Subordinated  Indebtedness  shall
contain a  specific  written  notice  therein  that the  indebtedness  evidenced
thereby is subordinated under the terms of this Guaranty Agreement.

         10. No amendment or waiver of any provision of this Guaranty  Agreement
or consent to any  departure by the  Guarantor  therefrom  shall in any event be
effective  unless the same shall be in writing and signed by Lender.  No failure
on the part of Lender to exercise, and no delay in exercising, any right, power,
or privilege  thereunder shall operate as a waiver thereof; nor shall any single
or partial exercise of any right, power, or privilege hereunder shall operate as
a waiver thereof;  nor shall any single or partial exercise of any right,  power
privilege  hereunder  preclude  any other or  further  exercise  thereof  or the
exercise of any other right, power, or

                                       -5-




<PAGE>



privilege.  The remedies herein provided are cumulative and not exclusive of any
remedies provided by law.

         11. Any acknowledgment or new promise,  whether by payment of principal
or  interest  or  otherwise  and  whether  by  Borrower  or  others (  including
Guarantor),  with respect to any of the Guaranteed  Indebtedness  shall,  if the
statute of limitations in favor of Guarantor against Lender shall have commenced
to run,  toll the running of such statute of  limitations  and, if the period of
such statute of  limitations  shall have expired,  prevent the operation of such
statute of limitations.

         12.  This  Guaranty  Agreement  is for the  benefit  of Lender  and its
successors  and assigns,  and in the event of an  assignment  of the  Guaranteed
Indebtedness,  or any part thereof,  the rights and benefits  hereunder,  to the
extent applicable to the indebtedness so assigned,  may be transferred with such
indebtedness.  This Guaranty Agreement is binding not only on Guarantor,  but on
Guarantor's successors and assigns.

         13.  Guarantor  recognizes  that Lender is relying  upon this  Guaranty
Agreement and the  undertakings of Guarantor  hereunder in making  extensions of
credit to Borrower  under the Loan  Agreement  and further  recognizes  that the
execution  and delivery of this Guaranty  Agreement is a material  inducement to
Lender in entering into the Loan Agreement.  Guarantor hereby  acknowledges that
there are no conditions to the full effectiveness of this Guaranty Agreement.

         14. This Guaranty Agreement is executed and delivered as an incident to
a lending transaction negotiated, consummated, and performable in Harris County,
Texas, and shall be governed by and construed in accordance with the laws of the
State  of  Texas.  Any  action  or  proceeding  against  Guarantor  under  or in
connection  with this Guaranty  Agreement may be brought in any state or federal
court in Harris County,  Texas.  Guarantor hereby irrevocably (i) submits to the
nonexclusive  jurisdiction of such courts,  and (ii) waives any objection it may
now or hereafter  have as to the venue of any such action or proceeding  brought
in such court or that such court is an inconvenient forum. Guarantor agrees that
service of process upon it may be made by certified or registered  mail,  return
receipt requested,  at its address specified below.  Nothing herein shall affect
the right of Lender to serve  process in any other  matter  permitted  by law or
shall  limit  the right of Lender  to bring  any  action or  proceeding  against
Guarantor  or with  respect to any of  Guarantor's  property  in courts in other
jurisdictions.  Any action or  proceeding by Guarantor  against  Lender shall be
brought only in a court located in Harris County, Texas.

         15.  Guarantor  shall pay on demand all  attorneys'  fees and all other
costs  and  expenses  incurred  by Lender in  connection  with the  preparation,
administration, enforcement, or collection of this Guaranty Agreement.



                                       -6-




<PAGE>



         16. Except as expressly  provided for herein,  Guarantor  hereby waives
promptness,  diligence,  notice of any default  under  Guaranteed  Indebtedness,
demand of payment, notice of acceptance of this Guaranty Agreement, presentment,
notice of protest, notice of dishonor, notice of intent to accelerate, notice of
acceleration,  notice of the incurring by Borrower of  additional  indebtedness,
and all other  notices and demands with respect to the  Guaranteed  Indebtedness
and this Guaranty  Agreement.  Without limiting the generality of the foregoing,
Guarantor  unconditionally waives, to the extent permitted by law, (a) notice of
any of the matters  referred to in Section 6 above, (b) all notices which may be
required by statute,  rule of law or otherwise,  now or hereafter in effect,  to
preserve intact any rights against Guarantor, including, without limitation, any
demand, presentment and protest, proof of notice of non-payment under any of the
Loan  Documents and notice of any Event of Default or any failure on the part of
Borrower,  Guarantor  or any other  guarantor of the  Obligations  to perform or
comply  with  any  covenant,  agreement,  term or  condition  of any of the Loan
Documents, (c) any right to enforcement, assertion or exercise against Borrower,
Guarantor  or  any  other  guarantor  of  the  Obligations  and  the  Guaranteed
Indebtedness,  as applicable,  of any right or remedy conferred under any of the
Loan Documents,  (d) requirement of diligence on the part of any Person, (e) any
requirement  to exhaust any remedies or to mitigate the damages  resulting  from
any  default  under  any of the Loan  Documents,  (f) any  notice  of any  sale,
transfer or other  disposition  of any right,  title or interest of Lender under
any of the Loan Documents and (g) any rights of Guarantor pursuant to Chapter 34
of the Texas Business and Commerce Code, as amended.

         17. The Loan Agreement,  and all of the terms thereof, are incorporated
herein by reference, the same as if stated verbatim herein, and Guarantor agrees
that  Lender  may  exercise  any and all  rights  granted  to it under  the Loan
Agreement  and the other  Loan  Documents  (as  defined  in the Loan  Agreement)
without affecting the validity or enforceability of this Guaranty Agreement.

         18. Guarantor  hereby  represents and warrants to Lender that Guarantor
has adequate  means to obtain from  Borrower on a continuing  basis  information
concerning the financial  condition and assets of Borrower and that Guarantor is
not relying  upon Lender to provide  (and Lender  shall have no duty to provide)
any such information to Guarantor either now of in the future.

         19. THIS GUARANTY  AGREEMENT  EMBODIES THE FINAL,  ENTIRE  AGREEMENT OF
GUARANTOR  AND LENDER WITH  RESPECT TO  GUARANTOR'S  GUARANTY OF THE  GUARANTEED
INDEBTEDNESS  AND  SUPERSEDES  ANY  AND  ALL  PRIOR   COMMITMENTS,   AGREEMENTS,
REPRESENTATIONS,  AND  UNDERSTANDINGS,  WHETHER WRITTEN OR ORAL, RELATING TO THE
SUBJECT GUARANTOR AND LENDER AS A FINAL AND COMPLETE  EXPRESSION OF THE TERMS OF
THE GUARANTY  AGREEMENT,  AND NO COURSE OF DEALING BETWEEN GUARANTOR AND LENDER,
NO COURSE OF PERFORMANCE, NO TRADE PRACTICES, AND NO EVIDENCE OF PRIOR,

                                       -7-




<PAGE>



CONTEMPORANEOUS  OR SUBSEQUENT  ORAL AGREEMENTS OR DISCUSSION OR OTHER EXTRINSIC
EVIDENCE OF ANY NATURE SHALL BE USED TO CONTRADICT,  VARY,  SUPPLEMENT OR MODIFY
ANY  TERM OF THIS  GUARANTY  AGREEMENT.  THERE  ARE NO ORAL  AGREEMENTS  BETWEEN
GUARANTOR AND LENDER.

         20. THE PARTIES  AGREE TO BE BOUND BY THE TERMS AND  CONDITIONS  OF THE
CURRENT ARBITRATION PROGRAM OF LENDER, WHICH IS INCORPORATED HEREIN BY REFERENCE
AND  ACKNOWLEDGED  AS  RECEIVED  BY THE  PARTIES  PURSUANT  TO WHICH ANY AND ALL
DISPUTES SHALL BE RESOLVED BY MANDATORY BINDING  ARBITRATION UPON THE REQUEST OF
ANY PARTY.

         21. (a) All payments  payable  hereunder  in respect of the  Guaranteed
Obligations  shall be payable by  Guarantor  to  Beneficiary  in the currency in
which the  Guaranteed  Obligations  are expressed  (herein  called the "Required
Currency").  The  obligations  of  Guarantor  to make  payment  in the  Required
Currency  shall not be discharged or satisfied by any payment or tender,  or any
recovery  pursuant to any  judgment  or order,  which is or is  expressed  in or
converted  into any  currency  other than the Required  Currency,  except to the
extent such payment,  tender or recovery  shall result in the actual  receipt by
Beneficiary  of  the  full  amount  of  the  foregoing,   Guarantor   authorizes
Beneficiary,  on any  payment,  tender or recovery in a currency  other than the
Required  Currency,  to  purchase  in  accordance  with its  normal  procedures,
Required  Currency  with the  amount  of such  other  currency  so  tendered  or
recovered. The obligation of Guarantor to make payments in the Required Currency
shall be  enforceable  as an  alternative  or additional  cause of action of the
purpose of  recovery  in the  Required  Currency of the amount (if any) by which
such actual  receipt shall fall short of the full amount due hereunder and shall
not be  affected by judgment  being  obtained  for any other sums due under this
Guaranty.

            (b) All payments made to Beneficiary  hereunder shall be made in the
Required  Currency  for value on the day on which  payment is due,  without  any
setoff or counterclaim,  free and clear of and without  deduction or withholding
for or on account of, any present of future  Taxes now or  hereafter  imposed by
any  governmental  or other  authority.  As used herein,  the term "Taxes" shall
include  all  withholding,  income,  gains,  excise,  stamp and  other  taxes of
whatever nature as well as all withholding,  levies, imports, duties, charges or
fees of whatever  nature.  If  Guarantor  is  compelled  by law to make any such
deductions  or  withholdings,  it will pay  such  additional  amounts  as may be
necessary  in order that the net amount  received  and  retained by  Beneficiary
after such  deduction  or  withholdings  (including  any  required  deduction or
withholding  (including any required deduction or withholding on such additional
amounts)  shall equal the amount it would have received and retained had no such
deduction  or  withholdings  been  required  to be  made,  and it  will  provide
Beneficiary  with evidence  satisfactory  to  Beneficiary  that it has paid such
deduction or withholdings.  Guarantor hereby agrees to indemnify Beneficiary and
hold it harmless against all losses, costs, expenses or other amounts

                                       -8-




<PAGE>



incurred  suffered  by  Beneficiary  by reason of the  failure of  Guarantor  to
perform its obligations under this clause (b)

         22. WITH RESPECT TO ANY AND ALL DISPUTES ARISING  HEREUNDER,  UNDER THE
NOTES,  UNDER THE GUARANTEED  OBLIGATIONS,  OR UNDER ANY OF THE OTHER  DOCUMENTS
EXECUTED IN CONNECTION HEREWITH NOT SETTLED OR SUBJECT TO ARBITRATION,  PURSUANT
TO ANY ARBITRATION  PROGRAM  REFERENCED TO HEREIN,  GUARANTOR HEREBY IRREVOCABLY
AND UNCONDITIONALLY:

            (A)  SUBMITS  FOR ITSELF  AND ITS  PROPERTY  IN ANY LEGAL  ACTION OR
PROCEEDING  RELATION TO THIS  GUARANTY AND ANY OTHER  DOCUMENT IN RESPECT OF ANY
THEREOF, TO THE NON-EXCLUSIVE GENERAL JURISDICTION OF THE COURTS OF THE STATE OF
TEXAS,  THE COURTS OF THE UNITED STATES OF AMERICA FOR THE SOUTHERN  DISTRICT OF
TEXAS, AND APPELLATE COURTS FROM ANY THEREOF;

            (B) CONSENTS  THAT ANY SUCH ACTION OR  PROCEEDING  MAY BY BROUGHT IN
SUCH COURTS,  AND WAIVES ANY OBJECTION THAT IT MAY NOW OR PROCEEDING IN ANY SUCH
COURT OR THAT SUCH ACTION OR PROCEEDING  WAS BROUGHT IN AN IMPROPER  VENUE OR AN
INCONVENIENT COURT AND AGREES NOT TO PLEAD OR CLAIM THE SAME;

            (C) AGREES THAT SERVICE OF PROCESS IN ANY SUCH ACTION OR  PROCEEDING
MAY BE EFFECTED BY MAILING A COPY THEREOF BY REGISTERED  OR CERTIFIED  MAIL ) OR
ANY SUBSTANTIALLY  SIMILAR FORM OF MAIL),  POSTAGE PREPAID, TO IT AT ITS ADDRESS
SPECIFIED ON THE SIGNATURE PAGE HEREOF;

            (D) AGREES  THAT  NOTHING  HEREIN  SHALL  AFFECT THE RIGHT TO EFFECT
SERVICE OF PROCESS IN ANY OTHER MANNER PERMITTED BY LAW OR SHALL LIMIT THE RIGHT
TO SUE IN ANY OTHER JURISDICTION;

            (E)  DESIGNATES  AND APPOINTS  MIKE WEBB,  WHOSE ADDRESS ON THE DATE
HEREOF IS 1990 POST OAK BLVD.,  SUITE 1670,  HOUSTON,  TEXAS 77056  (HEREINAFTER
CALLED THE "PROCESS  AGENT"),  AS ITS  ATTORNEY-INFACT  IN THE UNITED  STATES OF
AMERICA,  TO RECEIVE  SERVICE OF PROCESS IN ANY ACTION,  SUIT OR PROCEEDING,  IT
BEING AGREED THAT  SERVICE UPON SUCH  ATTORNEY-IN-FACT  SHALL  CONSTITUTE  VALID
SERVICE UPON IT OR ITS SUCCESSORS AND ASSIGNS;




                                       -9-




<PAGE>



            (F) AGREES THAT ITS SUBMISSION TO  JURISDICTION  AND ITS DESIGNATION
OF THE PROCESS AGENT SET FORTH ABOVE IS MADE FOR THE EXPRESS BENEFIT OF PAYEE;

            (G)  AGREES  THAT  ITS  SUBMISSION  TO  JURISDICTION  BY SUIT ON THE
JUDGMENT OR IN ANY OTHER MANNER BEING CONCLUSIVE EVIDENCE OF THE FACT AND AMOUNT
OF ANY OF ITS LIABILITY THEREIN DESCRIBED; AND

            (H) COVENANTS AND AGREES THAT SO LONG AS THIS NOTES SHALL BE UNPAID,
IT SHALL  MAINTAIN A DULY  APPOINTED  AGENT FOR THE SERVICE OF SUMMONS AND OTHER
LEGAL PROCESS IN HOUSTON, TEXAS, U.S.A.

         23. THIS GUARANTY AND THE OTHER LOAN  DOCUMENTS,  AND  INSTRUMENTS  AND
DOCUMENTS  EXECUTED  IN  CONNECTION  HEREWITH,  REPRESENTS  THE FINAL  AGREEMENT
BETWEEN  THE  PARTIES  AND  MAY  NOT  BE  CONTRADICTED  BY  EVIDENCE  OF  PRIOR,
CONTEMPORANEOUS,  OR SUBSEQUENT  ORAL  AGREEMENTS  OF THE PARTIES.  THERE ARE NO
UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.

         24.  Language.  All  notices,   communications,   evidences,   reports,
opinions,  financial  statements and other  documents  given under this Guaranty
unless  submitted in the English  language shall be accompanied by one certified
copy of an  English  translation  thereof  for  each  copy of the  foregoing  so
submitted and the event of any conflict with the non-English version thereof.


         EXECUTED as of the 29 day of May, 1996.


                                         GUARANTOR:

                                         GEOEVALUACIONES S.A. DE C. V.


                                         By:  _____________________________
                                         Name: Luis H. Ferran Arroyo.
                                         Title:  President
                                         Address: Ave Rio Churubusco 522 Col. El
                                         Retono 09440 Mexico City



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