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








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-








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-








            (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-








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-








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-








         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-








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-








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-








            (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



                                      -10-