3-D GEOPHYSICAL INC
8-K, 1997-12-23
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)          November 17, 1997
                                                 -------------------------------



                              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.)



 8226 Park Meadows Drive,  Littleton, Colorado                          80124
- --------------------------------------------------------------------------------
 (Address of principal executive offices)                             (Zip Code)


Registrant's telephone number, including area code:  (303) 858-0500



7076 South Alton Way, Building H, Englewood, Colorado                    80112 
- --------------------------------------------------------------------------------
         (Former name or former address, if changed since last report.)


                       The Exhibit Index appears on Page 6
                                Page 1 of    pages.


<PAGE>

Item 5.  Other Events.

         On November  17,  1997 (the  "Closing  Date"),  3-D  Geophysical,  Inc.
(together with its  wholly-owned  subsidiary,  Northern  Geophysical of America,
Inc., the "Registrant")  entered into a $30 million credit facility (the "Credit
Facility")  with Sanwa Business  Credit  Corporation  ("Sanwa").  Funding of the
Credit  Facility  occurred on November 18, 1997 with $10.1 million used to repay
the  Registrant's  outstanding debt to Wells Fargo Bank, N.A. under its existing
credit facility, which is being terminated.  The Credit Facility will be also be
used to finance the continued growth of the Registrant's business,  particularly
in Canada,  Alaska and Latin America.  The  Registrant  also repaid loans in the
aggregate of $850,000 plus interest to five persons: Joel Friedman,  Chairman of
the Board  ($125,000);  Wayne P.  Widynowski,  Executive  Vice  President  and a
director ($100,000); Ronald L. Koons, Vice President and Chief Financial Officer
($250,000);   Ralph  M.  Bahna,  a  director  ($125,000);  and  Lewis  Brazelton
($250,000).

         Under the Loan and Security  Agreement, dated  November 17, 1997,  (the
"Loan Agreement") Sanwa has provided the Registrant with a $10 million five-year
term loan (the "Term  Loan"),  a $10  million  credit line to be used to finance
capital  expenditures (the "Capex Loan") and a $10 million revolving credit line
(the "Revolving  Credit Loan") for five years. The Term Loan is payable in equal
monthly installments through and including November 1, 2002. The Term Loan bears
interest  at an annual  rate equal to the prime rate plus 1% or LIBOR plus 3.5%,
whichever the Registrant prefers.  Draws on the Capex Loan during each 12- month
period following the Closing Date will be combined into a single promissory note
at the end of each such period,  repayable  based upon a 60-month  amortization,
payable  in full at the end of five  years from the  Closing  Date.  The rate of
interest  for the Capex Loan is the same as those  described  above for the Term
Loan. The Revolving Credit Loan may be drawn down from time to time in an amount
not to exceed the lesser of (i) Ten Million Dollars  ($10,000,000)  and (ii) 80%
of the Registrant's "Eligible Accounts" (as defined in the Loan Agreement).  The
Revolving  Credit  Loan bears an  interest  at an annual rate equal to the prime
rate plus  0.5% or LIBOR  plus  2.75%,  whichever  the  Registrant  prefers.  In
addition to certain customary affirmative covenants, the Loan Agreement contains
restrictions  on the  Registrant  with  respect to (i)  declaring  or paying any
dividends or other  distributions  on its capital stock (or acquiring any of its
capital stock),  (ii) incurring Debt (as defined),  (iii) issuing capital stock,
(iv) entering into  transactions  with affiliates,  and (v) disposing of assets.
The  foregoing  summary of the Loan  Agreement  is  qualified in its entirety by
reference  to the Loan and  Security  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 and Security Agreement between 3-D
                  Geophysical, Inc. and Sanwa Business Credit
                  Corporation, dated as of November 17, 1997.

         10.2     Term Note between Northern Geophysical of
                  America, Inc. and Sanwa Business Credit
                  Corporation, dated as of November 17, 1997.

         10.3     Security Agreement of 3-D Geophysical, Inc.
                  between 3-D Geophysical, Inc. and Sanwa
                  Business Credit Corporation, dated as of
                  November 17, 1997.

         10.4     Security Agreement between J.R.S. Exploration Company
                  Limited and Sanwa Business Credit Corporation,  dated
                  as of November 7, 1997.

         10.5     Trademark Security Agreement between 3-D
                  Geophysical, Inc. and Sanwa Business Credit
                  Corporation, dated as of November 17, 1997.

         10.6     Pledge Agreement between 3-D Geophysical, Inc.
                  and Sanwa Business Credit Corporation (with respect
                  to the capital stock of Northern Geophysical of
                  America, Inc.) dated as of November 17, 1997.

         10.7     Pledge Agreement between 3-D Geophysical, Inc.
                  and Sanwa Business Credit Corporation (with respect
                  to the capital stock of 3-D Geophysical of Canada,
                  Inc.) dated as of November 17, 1997.

         10.8     Pledge Agreement between 3-D Geophysical, Inc.
                  and Sanwa Business Credit Corporation (with respect
                  to the capital stock of 3-D Geophysical of Latin
                  America, Inc.) dated as of November 17, 1997.

         10.9     Pledge Agreement between 3-D Geophysical, Inc.
                  and Sanwa Business Credit Corporation (with respect
                  to the capital stock of Geoevaluaciones, S.A. de C.V.
                  and Procesos Interactivos Avanzados, S.A. de C.V.)
                  dated as of November 17, 1997.


                                Page 3 of    pages.

<PAGE>

          10.10    Security Agreement  (Securities) between W.G. Mueller
                   Consulting  Services Ltd. and Sanwa  Business  Credit
                   Corporation  (with  respect to the  capital  stock of
                   J.R.S.  Exploration  Company  Limited)  dated  as  of
                   November 17, 1997.

          10.11    Security Agreement (Securities) between Jan Vo
                   Equities Ltd. and Sanwa Business Credit
                   Corporation (with respect to the capital stock
                   of J.R.S. Exploration Company Limited) dated as
                   of November 17, 1997.


                                Page 4 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/Ronald L. Koons
                                                  ----------------------
                                                  Name:  Ronald L. Koons
                                                  Title: Vice President



Date:  December 23, 1997


                                Page 5 of    pages.

<PAGE>

                                  EXHIBIT INDEX

Exhibit                                                                    Page


10.1     Loan and Security Agreement between 3-D Geophysical, Inc. and
         Sanwa Business Credit  Corporation,  dated as of November 17,
         1997.

10.2     Term Note between Northern  Geophysical of America,  Inc. and
         Sanwa Business Credit  Corporation,  dated as of November 17,
         1997.

10.3     Security  Agreement  of 3-D  Geophysical,  Inc.  between  3-D
         Geophysical,  Inc.  and Sanwa  Business  Credit  Corporation,
         dated as of November 17, 1997.

10.4     Security Agreement between J.R.S. Exploration Company Limited
         and Sanwa Business Credit  Corporation,  dated as of November
         7, 1997.

10.5     Trademark  Security  Agreement between 3-D Geophysical,  Inc.
         and Sanwa Business Credit  Corporation,  dated as of November
         17, 1997.

10.6     Pledge  Agreement  between 3-D  Geophysical,  Inc.  and Sanwa
         Business  Credit  Corporation  (with  respect to the  capital
         stock of Northern  Geophysical of America,  Inc.) dated as of
         November 17, 1997.

10.7     Pledge  Agreement  between 3-D  Geophysical,  Inc.  and Sanwa
         Business  Credit  Corporation  (with  respect to the  capital
         stock  of  3-D  Geophysical  of  Canada,  Inc.)  dated  as of
         November 17, 1997.

10.8     Pledge  Agreement  between 3-D  Geophysical,  Inc.  and Sanwa
         Business  Credit  Corporation  (with  respect to the  capital
         stock of 3-D Geophysical of Latin America,  Inc.) dated as of
         November 17, 1997.

10.9     Pledge  Agreement  between 3-D  Geophysical,  Inc.  and Sanwa
         Business  Credit  Corporation  (with  respect to the  capital
         stock  of   Geoevaluaciones,   S.A.  de  C.V.   and  Procesos
         Interactivos  Avanzados,  S.A.  de C.V.) dated as of November
         17, 1997.

10.10    Security   Agreement   (Securities)   between  W.G.   Mueller
         Consulting   Services   Ltd.   and  Sanwa   Business   Credit
         Corporation  (with  respect  to the  capital  stock of J.R.S.
         Exploration Company Limited) dated as of November 17, 1997.

10.11    Security Agreement  (Securities) between Jan Vo Equities Ltd.
         and Sanwa Business  Credit  Corporation  (with respect to the
         capital stock of J.R.S. Exploration Company Limited) dated as
         of November 17, 1997.


                                Page 6 of    pages.


                           LOAN AND SECURITY AGREEMENT

                          DATED AS OF NOVEMBER 17, 1997

                                     BETWEEN

                        SANWA BUSINESS CREDIT CORPORATION

                                    AS LENDER

                                       AND

                      NORTHERN GEOPHYSICAL OF AMERICA, INC.
                                   AS BORROWER


<PAGE>


                           TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                                                                         PAGE
<S>                                                                                          <C>
1.  DEFINITIONS AND ACCOUNTING TERMS.........................................................1

    1.1      ................................................................"Account Debtor"1

    1.2      ......................................................................"Accounts"1

    1.3      ....................................................................."Affiliate"1

    1.4      .........................................................."Ancillary Agreements"1

    1.5      ...................................................."Average Daily Availability"2

    1.6      ....................................................................."Borrowing"2

    1.7      .................................................................."Business Day"2

    1.8      ...................................................................."Capex Loan"2

    1.9      ...................................................................."Capex Note"2

    1.10     .........................................................."Capital Expenditures"2

    1.11     ......................................................"Cash Flow Coverage Ratio"2

    1.12     ................................................................."Change of Law"2

    1.13     ......................................................................."Charges"2

    1.14     .................................................................."Closing Date"2

    1.15     ...................................................................."Collateral"2

    1.16     ......................................................."Collateral Availability"2

    1.17     ....................................................................."Companies"3

    1.18     ....................................................................."Computers"3

    1.19     ................................................................"Current Assets"3

    1.20     ..........................................................."Current Liabilities"3

    1.21     ......................................................."Daily Collateral Report"3

    1.22     ......................................................................."Default"3

    1.23     .................................................................."Default Rate"3

    1.24     ......................................................................."Dollars"3

    1.25     ..............................................................."Depository Bank"3

    1.26     ................................................................"Direct Charges"3

    1.27     ........................................................................"EBITDA"3

    1.28     ............................................................."Eligible Accounts"3




<PAGE>

                           TABLE OF CONTENTS
                              (CONTINUED)
                                                                            PAGE

    1.29     ................................................................"Environmental Laws"4

    1.30     ........................................................................."Equipment"4

    1.31     ............................................................................."ERISA"4

    1.32     .................................................................."Event of Default"4

    1.33     ........................................................................"Financials"4

    1.34     .............................................................................."GAAP"4

    1.35     ..............................................................."General Intangibles"4

    1.36     ................................................................."Governmental Rule"4

    1.37     ........................................................................."Guarantor"4

    1.38     ..............................................................."Hazardous Materials"4

    1.39     ......................................................................"Indebtedness"4

    1.40     ......................................................................"Initial Term"5

    1.41     ......................................................."Interest Determination Date"5

    1.42     ..................................................................."Interest Period"5

    1.43     ........................................................................."Inventory"5

    1.44     ......................................................................."Liabilities"5

    1.45     ............................................................................."LIBOR"5

    1.46     ........................................................................"LIBOR Loan"6

    1.47     ....................................................................."LIBOR Portion"6

    1.48     .............................................................................."Lien"6

    1.49     ..................................................................."Loan" or "Loans"6

    1.50     ......................................................................"Loan Account"6

    1.51     ............................................................"Net Profit After Taxes"6

    1.52     ............................................................................."Notes"6

    1.53     ...................................................."Notice of Borrowing/Conversion"6

    1.54     ......................................................................."Overadvance"6

    1.55     ......................................................................."Participant"6

    1.56     ..................................................................."Permitted Liens"6

    1.57     ............................................................................"Person"7


                                      -ii-


<PAGE>


                           TABLE OF CONTENTS
                              (CONTINUED)
                                                                                               PAGE

    1.58     ............................................................................."Portion"7

    1.59     ......................................................................"Prepayment Fee"7

    1.60     .........................................................................."Prime Rate"7

    1.61     ....................................................................."Prime Rate Loan"7

    1.62     ........................................................................"Renewal Term"7

    1.63     ...................................................................."Reportable Event"7

    1.64     ......................................................................"Revolving Loan"7

    1.65     ............................................................"Revolving Loan Borrowing"7

    1.66     .................................................................."Security Documents"7

    1.67     .................................................................."Special Collateral"7

    1.68     ..............................................................................."Stock"7

    1.69     ..........................................................................."Subsidiary"8

    1.70     ..................................................................."Tangible Net Worth"8

    1.71     ............................................................................"Term Loan"8

    1.72     ............................................................................"Term Note"8

    1.73     .................................................................................."3-D"8

    1.74     ......................................................................."Total Facility"8

    1.75     ................................................................................."Type"8

2.  LOANS: GENERAL TERMS............................................................................8

    2.1      ........................................................................Total Facility.8

    2.2      ........................................Advances to Constitute One Loan; Loan Purpose.11

    2.3      ........................................................................Interest Rate.12

    2.4      ..............................................................Change of Circumstances.12

    2.5      .........................................................Funding Loss Indemnification.13

    2.6      ..........................................................................Prepayments.14

    2.7      ....................................Term of Agreement; Prepayment; Liquidated Damages.14

    2.8      ............................................................................Audit Fee.15

    2.9      ..........................................................................Closing Fee.15

    2.10     .....................................................................Unused Line Fee.15


                                      -iii-

<PAGE>

                           TABLE OF CONTENTS
                              (CONTINUED)
                                                                                               PAGE

3.  ELIGIBLE ACCOUNTS; ELIGIBLE INVENTORY.........................................................16

    3.1      ...................................................................Eligible Accounts.16

4.  PAYMENTS......................................................................................17

    4.1      .............................................Loan Account; Method of Making Payments.17

    4.2      .......................................................................Payment Terms.17

    4.3      .................................................Collection of Accounts and Payments.18

    4.4      .............................................Application of Payments and Collections.18

    4.5      ..........................................................................Statements.19

5.  COLLATERAL: GENERAL TERMS.....................................................................19

    5.1      ...................................................................Security Interest.19

    5.2      .....................................................Disclosure of Security Interest.19

    5.3      ..................................................................Special Collateral.19

    5.4      ..................................................................Further Assurances.19

    5.5      ..........................................................................Inspection.20

    5.6      .....................................Perfection and Priority; Location of Collateral.20

    5.7      ..............................Lender's Payment of Claims Asserted Against Collateral.20

6.  COLLATERAL: ACCOUNTS..........................................................................21

    6.1      ............................................................Verification of Accounts.21

    6.2      ....................................Assignments, Records and Daily Collateral Report.21

    6.3      ..................................................Notice Regarding Disputed Accounts.21

    6.4      .....................................................Sale or Encumbrance of Accounts.21

7.  COLLATERAL:  INVENTORY........................................................................21

8.  COLLATERAL: EQUIPMENT.........................................................................21

    8.1      ........................................................Maintenance of the Equipment.21

    8.2      ..................................................Evidence of Ownership of Equipment.21

    8.3      ...........................................................Proceeds of the Equipment.21

    8.4      ...............................................................Location of Equipment.22

9.  WARRANTIES AND REPRESENTATIONS................................................................22

    9.1      ..............................................General Warranties and Representations.22


                                 -iv-


<PAGE>

                                TABLE OF CONTENTS
                                   (CONTINUED)
                                                                           PAGE

    9.2      ..............................................Account Warranties and Representations.25

    9.3      ............................................Inventory Warranties and Representations.26

    9.4      ..........................Automatic Warranty and Representation and Reaffirmation of

             Warranties and Representations.......................................................26

    9.5      ..........................................Survival of Warranties and Representations.26

10. COVENANTS AND CONTINUING AGREEMENTS...........................................................27

    10.1     ...............................................................Affirmative Covenants.27

    10.2     ..................................................................Negative Covenants.29

    10.3     ..................................................................Contesting Charges.31

    10.4     ..................................................................Payment of Charges.31

    10.5     ......................................................Insurance; Payment of Premiums.31

    10.6     ...............................Survival of Obligations Upon Termination of Agreement.32

    10.7     .............................................................Environmental Indemnity.32

    10.8     ...................................................................Change of Control.32

    10.9     ................................................................Revisions or Updates.32

11. CONDITIONS PRECEDENT TO CLOSING...............................................................33

12. DEFAULT; RIGHTS AND REMEDIES ON DEFAULT.......................................................35

    12.1     .............................................................................Default.35

    12.2     .....................................................Acceleration of the Liabilities.37

    12.3     .........................................................Advances During Cure Period.37

    12.4     ........................................................................Default Rate.37

    12.5     ............................................................................Remedies.37

    12.6     ..............................................................................Notice.38

13. MISCELLANEOUS.................................................................................38

    13.1     .........................Appointment of Lender as Borrower's Lawful Attorney-In-Fact.38

    13.2     ...........................Modification of Agreement; Assignment or Sale of Interest.39

    13.3     .......................Attorneys' Fees and Expenses; Lender's Out-of-Pocket Expenses.39

    13.4     ....................................................................Waiver by Lender.40

    13.5     ........................................................................Severability.40


                                     -v-

<PAGE>

    13.6     ...........................................................Parties; Entire Agreement.40

    13.7     ...................................................................Conflict of Terms.41

    13.8     ..................................................................Waiver by Borrower.41

    13.9     ................................................................Governing Law, Venue.41

    13.10    ..............................................................................Notice.42

    13.11    .................................................................Section Titles, Etc.42

    13.12    ...................................................................Course of Dealing.42

    13.13    ..............................................................................Setoff.43

    13.14    ..............................................................Nonliability of Lender.43

    13.15    .................................................................Time of the Essence.43

    13.16    .....................................................................Indemnification.43

    13.17    ....................................................Waiver of Right to Trial by Jury.44
</TABLE>


                                LIST OF EXHIBITS

Exhibit A           Financials
Exhibit B           Form of Notice of Borrowing/Conversion
Exhibit C           Locations
Exhibit D           Tradenames
Exhibit E           Litigation
Exhibit F           Title to Assets, Liens
Exhibit G           Affiliates and Subsidiaries
Exhibit H           Covenant Compliance Certificate
Exhibit I           Form of Daily Collateral Report
Exhibit J           Existing Indebtedness for Borrowed Money

Schedule 1.29       Equipment
Schedule 10.1(a)    Financial Covenants
Schedule 10.2       Deposit Accounts


                                       -i-

<PAGE>

                           LOAN AND SECURITY AGREEMENT


                  THIS LOAN AND SECURITY  AGREEMENT  ("Agreement") is made as of
the  17th  day  of  November,   1997,  by  and  between  Sanwa  Business  Credit
Corporation,  a Delaware  corporation  ("Lender"),  and Northern  Geophysical of
America, Inc., a Delaware corporation ("Borrower").

                              W I T N E S S E T H:

                  WHEREAS,  Borrower  desires to borrow  funds and obtain  other
financial  accommodations  from  Lender,  and Lender is willing to make  certain
loans and provide other financial  accommodations to Borrower upon the terms and
subject to the conditions set forth herein;

                  NOW THEREFORE,  in  consideration  of the terms and conditions
contained herein, and of any loans or other financial accommodations heretofore,
now or hereafter made to, or for the benefit of, Borrower by Lender, the parties
hereto agree as follows:

1.       DEFINITIONS AND ACCOUNTING TERMS

         A. Specific Defined Terms. When used herein,  the following terms shall
have the following respective meanings:

         1.1  "ACCOUNT  DEBTOR"  shall  mean any Person who is or who may become
obligated to Borrower under, with respect to, or on account of an Account.

         1.2  "ACCOUNTS"  shall mean and  include  all of  Borrower's  presently
existing and hereafter arising or acquired  accounts,  receivables and rights of
Borrower  to  payment  for  goods  sold  or  leased  or for  services  rendered,
including,  without limitation,  those which are not evidenced by instruments or
chattel paper, and whether or not they have been earned by performance; proceeds
of any  letters of credit on which  Borrower is named as  beneficiary;  contract
rights; chattel paper; instruments;  documents; insurance proceeds; and all such
obligations whatsoever owing to Borrower,  together with all instruments and all
documents  of  title  representing  any  of the  foregoing,  all  rights  in any
merchandise or goods which any of the same may represent,  and all right, title,
security  and  guaranties  with  respect  to each of the  foregoing,  including,
without limitation, any right of stoppage in transit.

         1.3  "AFFILIATE"  shall mean any and all  Subsidiaries  and any and all
Persons which, in the reasonable judgment of Lender, directly or indirectly, own
or control, are controlled by or are under common control with Borrower, and any
and all Persons from whom, in the  reasonable  judgment of Lender,  Borrower has
not or is not likely to exhibit  independence  of  decision  or action.  For the
purpose  of  this  definition,  "control"  means  the  possession,  directly  or
indirectly,  of the power to direct or cause the  direction  of  management  and
policies of a Person,  whether  through the ownership of voting  securities,  by
contract or otherwise.

         1.4 "ANCILLARY  AGREEMENTS"  shall mean all Security  Documents and all
agreements,  instruments and documents,  including  without  limitation,  notes,
guaranties,


                                        1


<PAGE>

mortgages, deeds of trust, chattel mortgages,  pledges, negative pledges, powers
of attorney,  consents,  assignments,  contracts,  notices, security agreements,
intellectual  property  security  agreements,   leases,   financing  statements,
subordination agreements,  trust account agreements and all other written matter
whether  heretofore,  now, or hereafter  executed by or on behalf of Borrower or
any other Person or delivered to Lender or any Participant  with respect to this
Agreement.

         1.5 "AVERAGE DAILY  AVAILABILITY"  shall mean for any period the sum of
Collateral  Availability for each Business Day during such period divided by the
number of Business Days in such period.

         1.6 "BORROWING" shall mean a borrowing by Borrower consisting of a Loan
made by Lender on the same date and of the same Type pursuant to a single Notice
of Borrowing/Conversion.
         1.7 "BUSINESS DAY" shall mean (a) any day on which commercial banks are
not authorized to close or not required to close in Los Angeles,  California and
(b) if such Business Day is related to a Loan which bears or is to bear interest
based on LIBOR,  any day in which dealings in Dollar deposits may be carried out
in the London interbank market.
         1.8 "CAPEX  LOAN" shall have the meaning  given to that term in Section
2.1(c).
         1.9 "CAPEX  NOTE" shall have the meaning  given to that term in Section
2.1(c).
         1.10  "CAPITAL  EXPENDITURES"  shall  mean  all  expenditures  made and
liabilities  incurred  for the  acquisition  of any fixed asset or  improvement,
replacement,  substitution or addition thereto,  which has a useful life of more
than one year and  including,  without  limitation,  those arising in connection
with capital leases.
         1.11 "CASH FLOW COVERAGE RATIO" shall mean for any period, the quotient
of (x) EBITDA  minus the sum of (A) all taxes paid during such  period,  (B) all
Capital  Expenditures  permitted hereunder and actually made, except any portion
thereof financed through Indebtedness permitted hereunder, and (C) all dividends
actually paid during such period,  divided by (y) the sum of (A) all  principal,
interest  and other  payments  made or required to be made by the  Companies  on
Indebtedness  during such  period,  including  any fees and charges  owed by the
Companies in connection with any such Indebtedness and (B) all capitalized lease
payments made or required to be made by the Companies during such period.
         1.12  "CHANGE  OF LAW"  shall  have the  meaning  specified  in Section
2.4(b).
         1.13 "CHARGES" shall mean all national,  federal,  state, county, city,
municipal,  or other governmental taxes, levies,  assessments,  charges,  liens,
claims or  encumbrances  (including,  without  limitation,  those of the Pension
Benefit Guaranty  Corporation) upon or relating to (i) the Collateral,  (ii) the
Liabilities, (iii) Borrower's employees, payroll, income or gross receipts, (iv)
Borrower's  ownership  or use of any of its assets,  or (v) any other  aspect of
Borrower's business.
         1.14 "CLOSING DATE" shall mean the date on which each of the conditions
precedent in Section 11 are satisfied and the initial Loans are made.
         1.15  "COLLATERAL"  shall mean all of the  property  and  interests  in
property  described  in Section  5.1 and all other  property  and  interests  in
property  which  shall,  from  time  to  time,  secure  all or any  part  of the
Liabilities.
         1.16 "COLLATERAL AVAILABILITY" shall have the meaning ascribed to it in
Section 2.1(a).


                                        2


<PAGE>

         1.17  "COMPANIES"  shall  mean,   collectively,   Borrower;   3-D;  3-D
Geophysical of Latin America, Inc., a Cayman Island company; J.R.S.  Exploration
Company,  Ltd., a Canada  corporation;  Geoevaluaciones,  S.A. de C.V., a Mexico
company; and Procesos Interactivos Avanzados, S.A. de C.V., a Mexico company.
         1.18  "COMPUTERS"  shall  mean  all  of  Borrower's  right,  title  and
interest,  now owned and hereafter acquired, in computer equipment and hardware,
including,  without limitation,  all central processing units,  terminals,  disk
drives,  tape drives,  electronic memory units,  printers,  keyboards,  screens,
peripherals (and other  input/output  devices),  modems and other  communication
controllers,  and any and  all  accessions,  parts  and  appurtenances  thereto,
substitutions therefore and replacements thereof, all intellectual property used
by Borrower,  at any time, in the operation of such computer equipment hardware,
including,  without limitation, all software, all of Borrower's rights under any
licenses related to Borrower's software or hardware,  and all leases pursuant to
which Borrower leases any computer equipment, hardware or software.
         1.19  "CURRENT  ASSETS"  shall mean the aggregate net book value of the
current assets of Borrower as determined in accordance with GAAP,  excluding any
Accounts owing to Borrower from any Affiliate.
         1.20  "CURRENT  LIABILITIES"  shall  mean the  aggregate  amount of all
liabilities of Borrower which would be classified as current  liabilities  under
GAAP.
         1.21 "DAILY  COLLATERAL  REPORT" shall mean a borrowing  base report in
the form of Exhibit I hereto  delivered  to Lender by  Borrower,  as required by
Section 6.2,  consisting of sales,  collections and an aged trial balance of all
of the  Accounts  existing  as of the  date of  such  Daily  Collateral  Report,
specifying  for each  Account  Debtor  obligated on the  Accounts,  such Account
Debtor's name, address and outstanding balance and the aging of such outstanding
balance;  inventory valuations as set forth in the most recent Inventory Report,
and such other information as may, from time to time, be required by Lender.
         1.22  "DEFAULT"  shall mean the  occurrence  or existence of any one or
more of the events described in Section 12.1.
         1.23  "DEFAULT  RATE" shall have the meaning  ascribed to it in Section
12.4.
         1.24 "DOLLARS" shall mean U.S. dollars.
         1.25  "DEPOSITORY  BANK"  shall mean the banking  institution  which is
referred to in Section 4.3.

         1.26 "DIRECT  CHARGES" shall mean accounts  arising from work performed
by subcontractors or other third parties and billed by Borrower.
         1.27  "EBITDA"  shall  mean,  for any  period,  the net income for such
period  of 3-D  determined  on a  consolidated  basis in  accordance  with  GAAP
(excluding any extraordinary income items, including,  without limitation,  gain
on sale of assets, income relating to foreign exchange, swap or other derivative
transactions  and  changes in GAAP),  plus the  following  items,  to the extent
deducted from the revenues of 3-D in the  calculation of net income or loss: (i)
depreciation,  (ii)  amortization  of intangibles  and any other non-cash items,
(iii) cash interest expense  (excluding any interest  paid-in-kind) and (iv) tax
expense.
         1.28 "ELIGIBLE  ACCOUNTS" shall mean those Accounts (including Accounts
of J.R.S. Exploration Company, Ltd., Geoevaluaciones, S.A. de C.V., and Procesos
Interactivos,  S.A.  de C.V.,  to the extent  provided  in Section  3.1  hereof)
included  in a Daily  Collateral  Report  which,  as of the  date of such  Daily
Collateral Report and at all times thereafter,  (i) satisfy the requirements for
eligibility  as  described in Section  3.1,  (ii) do not violate the  covenants,
representations  and warranties and other provisions of this Agreement and (iii)
Lender, in its reasonable credit judgment, deems to be Eligible Accounts.


                                        3


<PAGE>

         1.29  "ENVIRONMENTAL  LAWS" shall mean the  Resource  Conservation  and
Recovery Act of 1987, the Comprehensive Environmental Response, Compensation and
Liability  Act,  any  so-called   "Superfund"  or  "Superlien"  law,  the  Toxic
Substances  Control  Act,  or any other  federal  state or local  statute,  law,
ordinance, code, rule, regulation,  order or decree regulating,  relating to, or
imposing liability or standards of conduct concerning,  any hazardous,  toxic or
dangerous  waste,  substance  or  material,  as now or at any time  hereafter in
effect.
         1.30  "EQUIPMENT"  shall mean all of Borrower's now owned and hereafter
acquired  equipment  and  fixtures,  including  without  limitation,  furniture,
machinery,  tools,  vehicles  and  trade  fixtures,  together  with  any and all
accessories,   parts  and  appurtenances  thereto,  substitutions  therefor  and
replacements  thereof,  including  without  limitation  the Equipment  listed in
Schedule 1.30 hereto.
         1.31 "ERISA" shall mean the Employee  Retirement Income Security Act of
1974, as amended.
         1.32 "EVENT OF DEFAULT" shall mean any event or condition  which,  with
the passage of time or the giving of notice or both, would constitute a Default.
         1.33  "FINANCIALS"  shall mean  those  consolidated  and  consolidating
financial  statements  of 3-D  attached  hereto as Exhibit "A" or  delivered  to
Lender pursuant to Section 10.1(e).
         1.34  "GAAP"  shall  mean  generally  accepted  accounting  principles,
consistently applied.
         1.35  "GENERAL  INTANGIBLES"  shall mean all choses in action,  general
intangibles,  causes of action and all other  intangible  personal  property  of
Borrower of every kind and nature  (other than  Accounts) now owned or hereafter
acquired  by  Borrower.  Without  in any  way  limiting  the  generality  of the
foregoing,  General Intangibles  specifically include,  without limitation,  all
corporate or other business  records,  security  deposits,  prepaid deposits and
expenses,  inventions,   designs,  patents,  patent  applications,   trademarks,
trademark  applications,  trade  names,  trade  secrets,  goodwill,  copyrights,
registrations,  licenses,  franchises,  tax refunds and tax refund  claims,  all
rights and claims against carriers and shippers,  all rights to indemnification,
and all  letters  of  credit,  guarantee  claims,  security  interests  or other
security held by or granted to Borrower to secure  payment by an Account  Debtor
of any Accounts.
         1.36 "GOVERNMENTAL  RULE" shall mean any applicable law or governmental
rule,  regulation  or order (or any  interpretation  thereof,  and including the
introduction of any new law or governmental rule, regulation or order).
         1.37  "GUARANTOR"  shall mean the Persons  described in Section 10.1(k)
and any other Person who after the date hereof guaranties all or any part of the
Liabilities.
         1.38  "HAZARDOUS  MATERIALS"  shall  mean any  hazardous  substance  or
pollutant  or  contaminant  defined  as such in (or  for  the  purposes  of) any
Environmental  Law and shall  include,  but not be limited  to,  petroleum,  any
radioactive material, and asbestos in any form or condition.
         1.39   "INDEBTEDNESS"   shall  mean  all  of  Borrower's   liabilities,
obligations  and  indebtedness  to any Person of any and every kind and  nature,
whether primary, secondary,  direct, indirect, absolute,  contingent,  fixed, or
otherwise,   heretofore,  now  or  hereafter  owing,  due  or  payable,  however
evidenced,  created,  incurred,  acquired or owing and however arising,  whether
under written or oral agreement,  by operation of law, or otherwise.  Without in
any way limiting the  generality  of the  foregoing,  Indebtedness  specifically
includes (i) the Liabilities,  (ii) all obligations or liabilities of any Person
that are secured by


                                        4


<PAGE>

any lien,  claim,  encumbrance  or  security  interest  upon  property  owned by
Borrower,  even though Borrower has not assumed or become liable for the payment
thereof, (iii) all obligations or liabilities created or arising under any lease
of real or personal  property,  or  conditional  sale or other  title  retention
agreement with respect to property used or acquired by Borrower, even though the
rights and remedies of the lessor,  seller or lender  thereunder  are limited to
repossession of such property,  (iv) all unfunded  pension fund  obligations and
liabilities and (v) deferred taxes.
         1.40  "INITIAL  TERM" shall have the meaning  ascribed to it in Section
2.7.
         1.41 "INTEREST  DETERMINATION  DATE" shall have the meaning ascribed to
it in Section 1.45.
         1.42  "INTEREST  PERIOD"  shall mean with  respect to any LIBOR Loan or
LIBOR Portion,  the time period selected by Borrower  pursuant to Section 2.1(i)
which,  in each case,  commences on the first day of such Loan or Portion or the
effective  date of any  conversion and ends on the last day of such time period,
and thereafter,  each  subsequent  time period selected by Borrower  pursuant to
Section 2.1(i) which commences on the last day of the immediately preceding time
period and ends on the last day of that time period.
         1.43 "INVENTORY" shall mean all goods, inventory, merchandise and other
personal property,  including,  without limitation,  goods in transit,  wherever
located and whether now owned or hereafter  acquired by Borrower which is or may
at any time be held for sale or lease,  furnished  under any contract of service
or held as raw  materials,  work  in  process,  supplies  or  materials  used or
consumed in Borrower's  business or are or might be used in connection  with the
manufacturing,  shipping,  advertising  or selling or  finishing  of such goods,
merchandise and other personal  property and all documents of title or documents
representing  the same,  and all such property the sale or other  disposition of
which has given rise to Accounts and which has been  returned to or  repossessed
or stopped in transit by Borrower.
         1.44   "LIABILITIES"   shall  mean  all  of   Borrower's   liabilities,
obligations and indebtedness to Lender of any and every kind and nature, whether
primary,   secondary,   direct,  absolute,   contingent,   fixed,  or  otherwise
(including,  without  limitation,  the Revolving  Loan, the Term Loan, any Capex
Loans or other accommodations,  interest, charges, expenses, attorneys' fees and
other sums chargeable to Borrower by Lender,  future advances made to or for the
benefit of Borrower and obligations of performance),  whether arising under this
Agreement,  under any other  Ancillary  Agreement or acquired by Lender from any
other source,  whether  heretofore,  now or hereafter  owing,  arising,  due, or
payable from Borrower to Lender, however evidenced,  created, incurred, acquired
or owing and however arising, whether under written or oral agreement, operation
of law, or otherwise.
         1.45 "LIBOR" shall mean the London  Interbank  Offered Rate.  The LIBOR
Rate shall be determined as of each Interest  Determination Date, which shall be
that date which  corresponds  to the initial  transaction  effective date and to
each subsequent  interest reset for the Interest Period.  LIBOR, with respect to
any Interest Determination Date, shall be determined as follows:
                           (i) As of the initial transaction effective date, the
         offered  rate for  deposits in Dollars for the  Interest  Period  which
         appears on Telerate Page 3750 at approximately 11:00 A.M., London time,
         on such Interest  Determination  Date.  "Telerate Page 3750" shall mean
         the  display   designated   as  Page  3750  on  the  Telerate   Systems
         Incorporated  financial  information  reporting  service (or such other
         page as may  replace  page  3750 on the  service  for  the  purpose  of
         displaying  London interbank  offered rates as published by the British
         Bankers' Association).


                                        5


<PAGE>

                           (ii) If no offered rate appears on the Telerate  Page
         3750,  the principal  London offices of each of four major banks in the
         London  interbank  market will be selected by Lender to provide  Lender
         with its offered  quotations  for  deposits in Dollars for the Interest
         Period to prime banks in the London  interbank  market at approximately
         11:00 A.M.  London time on such  Interest  Determination  Date and in a
         principal amount equal to an amount of not less than $1 million that is
         representative of a single  transaction in such market at such time. If
         at least two such quotations are provided, LIBOR will be the arithmetic
         mean of such  quotations.  If fewer than two  quotations  are provided,
         LIBOR  in  respect  of such  Interest  Determination  Date  will be the
         arithmetic mean of the offered rates quoted by three major money center
         banks in the City of New York selected by Lender at approximately 11:00
         A.M., New York City time, on such Interest Determination Date for loans
         in Dollars to leading European banks, for such Interest Period and in a
         principal amount of not less than $1 million that is  representative of
         a single  transaction in such market at such time;  provided,  however,
         that if fewer than three  banks  selected  as  aforesaid  by Lender are
         quoting rates as set forth above,  LIBOR for such Interest  Period will
         be the same as LIBOR for the immediately preceding Interest Period (or,
         if there was no such Interest  Period,  the rate of interest payable on
         the  LIBOR  Loans  for  which  LIBOR is being  determined  shall be the
         initial  interest  rate).  1.46  "LIBOR  LOAN"  shall  mean any Loan or
         Portion which bears interest at a rate
per annum based upon LIBOR.
         1.47  "LIBOR  PORTION"  shall mean (i) with  respect  to the  Revolving
Loans,  the  Portion of the  Revolving  Loans  which  bears  interest  at a rate
determined  by reference to LIBOR as provided in Section  2.1(e)(ii),  (ii) with
respect to the Term Loan, the Portion of the Term Loan which bears interest at a
rate  determined  by reference to LIBOR as provided in Section  2.1(f)(ii),  and
(iii) with respect to the Capex Loan,  the Portion of the Capex Loan which bears
interest  at a rate  determined  by  reference  to LIBOR as  provided in Section
2.1(g)(ii).
         1.48 "LIEN" means any mortgage,  deed of trust, pledge,  hypothecation,
security interest,  encumbrance, lien or charge, whether arising by operation of
law or otherwise.
         1.49 "LOAN" OR "LOANS" shall mean any or all of the advances to be made
by Lender pursuant to this Agreement.
         1.50 "LOAN  ACCOUNT"  shall have the meaning  ascribed to it in Section
4.1.
         1.51 "NET PROFIT  AFTER TAXES" shall mean net income for such period of
Borrower determined in accordance with generally accepted accounting  principles
("GAAP"),  consistently  applied (excluding any extraordinary  items,  including
without  limitation  income or expenses  related to foreign  exchange,  swaps or
other derivative transactions and changes in GAAP).
         1.52  "NOTES"  shall  mean,  collectively,  the Term Note and the Capex
Notes.
         1.53 "NOTICE OF  BORROWING/CONVERSION"  shall have the meaning given to
that term in Section 2.1(d).
         1.54 "OVERADVANCE" shall have the meaning given to that term in Section
2.6(b).
         1.55  "PARTICIPANT"  shall mean any Person, now or at any time or times
hereafter,   participating   with  Lender  in  the  Loans  or  other   financial
accommodations  made by Lender to Borrower  pursuant to this  Agreement  and the
Ancillary Agreements.
         1.56     "PERMITTED LIENS" shall mean the following:
                           (i)  Any  Liens  existing  on the  Closing  Date  and
         disclosed in Exhibit "F" or arising  under this  Agreement or the other
         Ancillary Documents;


                                        6


<PAGE>

                           (ii)  Liens for  taxes,  fees,  assessments  or other
         governmental charges or levies on real property,  either not delinquent
         or being  contested in good faith by  appropriate  proceedings  and for
         which adequate reserves have been established;
                           (iii) Liens upon or in any Equipment acquired or held
         by  Borrower  to  secure  the  purchase  price  of  such  Equipment  or
         indebtedness   incurred   solely  for  the  purpose  of  financing  the
         acquisition of such Equipment in the original  principal  amount not to
         exceed One Million  Five  Hundred  Thousand  Dollars  ($1,500,000)  per
         fiscal year of Borrower. 
         1.57  "PERSON"  shall  mean  any   individual,   sole   proprietorship,
partnership, limited liability partnership, joint venture, trust, unincorporated
organization,  association, corporation, limited liability company, institution,
entity,  party, or government (whether national,  federal,  state, county, city,
municipal or otherwise,  including,  without  limitation,  any  instrumentality,
division, agency, body or department thereof).
         1.58 "PORTION" shall mean an amount of any Revolving Loan, Term Loan or
Capex Loan which is less than the entire  outstanding  principal balance of such
Revolving Loan, Term Loan or Capex Loan.
         1.59  "PREPAYMENT FEE" shall have the meaning ascribed to it in Section
2.7.
         1.60 "PRIME RATE" shall mean the highest prime rate of interest quoted,
from time to time,  by The Wall  Street  Journal as the "base rate on  corporate
loans at large U.S. money center commercial banks";  provided,  however, that if
The Wall Street Journal ceases quoting a prime rate of the type described, Prime
Rate shall mean the highest per annum rate of interest quoted as the "Bank Prime
Loan" rate for "This Week" in Statistical Release H.15 (519) published from time
to time by the Board of  Governors  of the  Federal  Reserve  System;  provided,
further,  that in the  event  that  both of the  aforesaid  indices  cease to be
published or to quote rates of the  aforesaid  types,  the "Prime Rate" shall be
determined  from a comparable  index  chosen by Lender in good faith.  The Prime
Rate shall change  effective on the date of the publication of any change in the
applicable index by which such "Prime Rate" is determined.
         1.61  "PRIME  RATE LOAN" shall mean any Loan or any Portion of any Loan
which bears interest at a rate per annum based upon the Prime Rate.
         1.62  "RENEWAL  TERM" shall have the meaning  ascribed to it in Section
2.7.
         1.63  "REPORTABLE  EVENT"  shall  have the  meaning  ascribed  to it in
Section 9.1(n).
         1.64 "REVOLVING  LOAN" shall have the meaning ascribed to it in Section
2.1(a).
         1.65  "REVOLVING  LOAN  BORROWING"  shall mean a borrowing  by Borrower
consisting  of a Revolving  Loan made by Lender on the same date and of the same
Type pursuant to a single Notice of Revolving  Loan  Borrowing.  1.66  "SECURITY
DOCUMENTS"  shall  mean  this  Agreement  and  all  other  agreements,  security
agreements,  instruments,  documents, financing statements,  warehouse receipts,
bills of lading, notices of assignment,  schedules, assignments, deeds of trust,
Ancillary Agreements,  mortgages and other written matter necessary or requested
by Lender to create, perfect and maintain perfected,  Lender's security interest
in the Collateral.  1.67 "SPECIAL COLLATERAL" shall have the meaning ascribed to
it in Section  5.3.  1.68  "STOCK"  shall mean all shares,  options,  interests,
membership  interests,  participations or other equivalents (however designated)
of  or  in a  corporation  or  limited  liability  company,  whether  voting  or
non-voting,  including, without limitation,  common stock, warrants,  membership
interests,   preferred  stock,   convertible   debentures  and  all  agreements,
instruments and documents convertible, in whole or in part, into any one or more
or all of the foregoing.


                                        7


<PAGE>

         1.69  "SUBSIDIARY"  shall mean,  with respect to Borrower,  each of the
Persons  identified as a "Subsidiary"  on Exhibit "G" hereto,  and any Person of
which Borrower  acquires,  after the date hereof,  50% or more of the issued and
outstanding voting stock.
         1.70  "TANGIBLE NET WORTH" shall mean, as of any  particular  date, the
difference between (a) 3-D's consolidated total assets as they would normally be
shown on the balance sheet of 3-D, but excluding  therefrom the aggregate amount
of all  3-D's  intangible  assets,  including  but  not  limited  to all  values
attributable to goodwill,  patents,  copyrights,  trademarks,  licenses, prepaid
deposits and expenses, leasehold improvements net of depreciation, other General
Intangibles  and Accounts due from Affiliates and other  intangibles  reasonably
determined by Lender and (b) 3-D's  consolidated  total liabilities and deferred
charges  as they would  usually be shown on such  balance  sheet,  including  as
liabilities  (without   duplication)  all  guarantees  of  the  indebtedness  of
Affiliates or any other Person.
         1.71 "TERM  LOAN"  shall  have the  meaning  ascribed  to it in Section
2.1(b).
         1.72 "TERM  NOTE"  shall  have the  meaning  ascribed  to it in Section
2.1(b).
         1.73 "3-D" means 3-D Geophysical, Inc., a Delaware corporation.
         1.74 "TOTAL  FACILITY" shall have the meaning ascribed to it in Section
2.1.
         1.75 "TYPE" shall mean, with respect to any Loan,  Borrowing or Portion
at any time, the  classification of such Loan,  Borrowing or Portion by the type
of interest rate it then bears, whether an interest rate based on the Prime Rate
or LIBOR.
         B. Accounting  Terms. Any accounting terms used in this Agreement which
are not specifically  defined shall have the meanings  customarily given them in
accordance with GAAP.
         C. Other Terms.  All other terms  contained in this Agreement which are
not otherwise  defined in this  Agreement  shall,  unless the context  indicates
otherwise,  have the meanings provided for by the Uniform Commercial Code of the
State of California to the extent the same are used or defined therein.
2.       LOANS: GENERAL TERMS
         2.1 TOTAL FACILITY.  Lender agrees to make available for Borrower's use
from time to time during the term of this  Agreement,  upon  Borrower's  request
therefor,  certain  Loans and other  financial  accommodations  in an  aggregate
principal amount outstanding not to exceed Thirty Million Dollars  ($30,000,000)
(the "Total Facility").  The Total Facility shall be subject to all of the terms
and conditions of this Agreement and shall consist of:
                  (A) Revolving  Loan. A revolving line of credit  consisting of
         advances  against  Eligible  Accounts  (the  "Revolving  Loan")  in  an
         aggregate principal amount not to exceed, at any time outstanding,  the
         lesser  of  (i)  Ten  Million  Dollars   ($10,000,000)   and  (ii)  the
         outstanding  amount  of  Collateral  Availability.   As  used  in  this
         Agreement,  "Collateral Availability" shall mean and, at any particular
         time and from time to time, be equal to, up to eighty  percent (80%) of
         the net  amount  (after  deduction  of such  reserves  as Lender in its
         reasonable  credit  judgment  deems proper and  necessary)  of Eligible
         Accounts.  The Revolving Loan shall be repayable as provided in Section
         4.2.
                  Lender shall have the right to establish reserves from time to
         time against  borrowing  availability  under the Revolving Loan in such
         amounts,  and with  respect  to such  matters,  as  Lender  shall  deem
         reasonably necessary or appropriate,  including,  without limitation, a
         $2,000,000   reserve   (which  amount  may  be  increased  in  Lender's
         reasonable  business judgment) with respect to the lawsuit described in
         Section  11(y)  below.  Lender may, in the  exercise of its  reasonable
         discretion, at any time and from


                                        8


<PAGE>

         time to time, increase or decrease the advance percentage  contained in
         this  Section  to be applied to  Eligible  Accounts.  In the event such
         percentage is decreased,  such decrease shall become effective upon not
         less than ten (10) Business Days notice to Borrower, unless an Event of
         Default has occurred and is  continuing or a material,  negative  audit
         finding has been made, in which case such  decrease  shall be effective
         immediately, for the purpose of calculating the amount which Lender may
         be willing to advance, or allow to remain outstanding, against Eligible
         Accounts.
                  (B) Term Loan. A term loan in the aggregate  principal  amount
         of Ten Million Dollars ($10,000,000) (the "Term Loan"),  evidenced by a
         term loan promissory note (the "Term Note"),  and repayable as provided
         therein. The Term Note shall be in a form and contain such terms as may
         be acceptable to Lender. The Term Loan shall be repayable in fifty-nine
         (59) equal consecutive  monthly  installments of principal plus accrued
         interest  commencing  on the  first  (1st)  Business  Day of the  month
         following  the  Closing  Date,  based  on  an  eighty-four  (84)  month
         amortization,  with all remaining  principal and all accrued but unpaid
         interest  thereon  payable at the end of the  Initial  Term;  provided,
         however, that if the Revolving Loan is terminated by Lender or Borrower
         for any reason the Term Loan shall be  immediately  due and  payable in
         full.
                  (C) Capex Loan. A Capital  Expenditure  line of credit ("Capex
         Loan") in an aggregate principal amount not to exceed the lesser of (i)
         $10,000,000 and (ii) 85% of the purchase price for new equipment and/or
         85% of the orderly  liquidation value (as determined by Lender) of used
         equipment,  in each case  exclusive  of taxes,  licenses,  delivery and
         installation expenses. Draws under the Capex Loan, once repaid, may not
         be  reborrowed.  Advances  under  the  Capex  Loan  will be  made  upon
         Borrower's  request for funds to finance the acquisition of new or used
         equipment, on the terms and subject to the conditions contained in this
         Agreement.  Draws  on  the  Capex  Loan  during  each  12-month  period
         following the Closing Date shall be combined  into a single  promissory
         note (each, a "Capex Note") at the end of such period,  repayable based
         upon a  60-month  amortization,  and  payable in full at the end of the
         Initial Term.  Until so evidenced by a Capex Note, Capex Loans shall be
         payable interest-only. If the Revolving Loan is terminated by Lender or
         Borrower for any reason,  the Capex Loan shall be  immediately  due and
         payable in full.
                  (D) Notice of Borrowing.  Borrower  shall request each Loan by
         delivering  to  Lender  an  irrevocable  written  notice in the form of
         Exhibit     "B",     appropriately     completed    (a    "Notice    of
         Borrowing/Conversion"), which specifies, among other things:
                           i  Whether  the  loan is to be a  Revolving  Credit
         Loan,  a Term Loan or a Capex  Loan (in each case  accompanied  by such
         supporting documentation as may be required hereunder);
                           (ii) The principal amount of the requested Borrowing;
                           (iii) Whether the requested Loan will be a Prime Rate
                           Loan or a
         LIBOR  Loan  (each  LIBOR  Borrowing  shall be in a  minimum  amount of
         $1,000,000 or an integral multiple of $1,000,000 in excess thereof);
                           (iv) If the requested Loan is to be a LIBOR Loan, the
         Interest  Period  selected by Borrower for such Loan in accordance with
         Section 2.1(i); and
                           
                           (v) The date of the requested Loan,  which shall be a
         Business Day.  Borrower shall give each Notice of  Borrowing/Conversion
         to  Lender  at  least  two (2)  Business  Days  before  the date of the
         requested Loan in the case of a Loan which will be a


                                        9


<PAGE>

LIBOR Loan and before 10:00 a.m.  Pacific time on the date of the requested Loan
in the  case  of a Loan  which  will  be a  Prime  Rate  Loan.  Each  Notice  of
Borrowing/Conversion  shall be  delivered  to Lender at the  office or  telecopy
number  specified in Section  13.10;  provided,  however,  that  Borrower  shall
promptly  deliver to Lender the  original of any Notice of  Borrowing/Conversion
initially  delivered by telecopy.  Notwithstanding the above, no LIBOR Loans may
be requested at any time after the  occurrence  and during the  continuance of a
Default.
                  (E) Revolving Loan Interest Rates. Borrower shall pay interest
         on the outstanding principal balance of each Revolving Loan for so long
         as such Revolving Loan is outstanding,  at one of the following  rates,
         based on a year of 360 days and actual days elapsed:
                           (i)  During  such  periods  as any  Portion  of  such
         Revolving  Loan is a Prime Rate Loan,  at a rate per annum equal to the
         Prime Rate plus  one-half  of one percent  (0.5%),  such rate to change
         from time to time as the Prime Rate shall change; and
                           (ii)  During  such  periods  as any  Portion  of such
         Revolving  Loan is a LIBOR Loan, at a rate per annum equal at all times
         during each  Interest  Period for such LIBOR  Portion to LIBOR for such
         Interest Period plus two and three-quarter percent (2.75%).
                  (F) Term Loan Interest  Rates.  Borrower shall pay interest on
         the first day of each month on the unpaid  principal amount of the Term
         Loan from the date the Term Loan is made  until  paid in full at one of
         the  following  rates,  based  on a year of 360 days  and  actual  days
         elapsed:
                           i  During  such  period as any  Portion of the Term
         Loan is a Prime Rate Loan, at a rate per annum on such Portion equal to
         the Prime Rate plus one percent  (1.0%),  such rate to change from time
         to time as the Prime Rate shall change; and
                           (ii)  During  such  period as any Portion of the Term
         Loan is a LIBOR  Loan,  at a rate per annum  equal at all times  during
         each Interest Period for such Portion to LIBOR for such Interest Period
         plus three and one-half percent (3.5%).
                  (G) Capex Loan Interest Rates.  Borrower shall pay interest on
         the first day of each month on the aggregate unpaid principal amount of
         the Capex Loan from the date the first Capex Loan is made until paid in
         full at one of the  following  rates,  based  on a year of 360 days and
         actual days elapsed:
                           i During  such  period as any  Portion of the Capex
         Loan is a Prime Rate Loan, at a rate per annum on such Portion equal to
         the Prime Rate plus one percent  (1.0%),  such rate to change from time
         to time as the Prime Rate shall change; and
                           (ii)  During  such period as any Portion of the Capex
         Loan is a LIBOR  Loan,  at a rate per annum  equal at all times  during
         each Interest  Period for such LIBOR Portion to LIBOR for such Interest
         Period  plus  three  and  one-half  percent  (3.5%).  All  Capex  Loans
         evidenced  by  Capex  Notes  shall  bear  interest  and be  payable  in
         accordance with the terms of such Capex Notes.
                  (H)  Conversion  of  Interest  Rate  on  Loans.  So long as no
         Default  has   occurred  and  is   continuing,   Borrower  may  convert
         outstanding  Prime Rate Loans into LIBOR  Loans and  outstanding  LIBOR
         Loans into Prime Rate Loans; provided,


                                       10


<PAGE>

         however,  that any  conversion  of LIBOR  Loans  into a Prime Rate Loan
         shall be made on, and only on, the last day of an  Interest  Period for
         such LIBOR Loans. At Lender's option in its sole  discretion,  upon the
         occurrence and at any time during the  continuation  of a Default,  all
         LIBOR Loans shall be converted to Prime Rate Loans,  and Borrower shall
         be liable for all costs and fees  associated  with such  conversion  as
         provided in this Agreement. Borrower shall request such a conversion by
         delivering   to   Lender   an   appropriately   completed   Notice   of
         Borrowing/Conversion, which specifies, among other things:
                           (i) The Prime Rate Portion or the LIBOR Portion which
         is to be  converted,  specifying  the amount  thereof and whether  such
         Portion is a Revolving  Loan Portion,  a Term Loan Portion,  or a Capex
         Loan Portion;
                           (ii) The  Type of  Loans  into  which  such  Loans or
         Portion are to be converted;
                           (iii) If Prime  Rate Loans are to be  converted  into
         LIBOR Loans, the Interest Period selected by Borrower for such Loans in
         accordance with Section 2.1(i); and
                           (iv)     The date of the requested  conversion, which
          shall be a Business Day.
Borrower shall give each Notice of  Borrowing/Conversion  to Lender at least two
(2) Business Days before the date of the  requested  conversion in the case of a
conversion  into LIBOR Loans,  and at least one (1) Business Day before the date
of the requested  conversion in the case of a conversion  into Prime Rate Loans.
Each Request for Borrowing/Conversion shall be delivered to Lender at the office
or to the telecopy number specified in Section 13.10;  provided,  however,  that
Borrower  shall  promptly  deliver  to  Lender  the  original  of any  Notice of
Borrowing/Conversion initially delivered by telecopy.
                 (i)LIBOR Interest  Periods.  The initial and each  subsequent
         Interest  Period  selected by Borrower for a LIBOR Loan shall be thirty
         (30), sixty (60) or ninety (90) days; provided,  however,  that (A) any
         Interest  Period  which  would  otherwise  end on a day  which is not a
         Business  Day shall be extended to the next  succeeding  Business  Day,
         unless such next Business Day falls in another calendar month, in which
         case  such  Interest  Period  shall  end on the  immediately  preceding
         Business Day; (B) any interest  Period for a LIBOR Loan which begins on
         the last Business Day of a calendar  month (or on a day for which there
         is no numerically corresponding day in the calendar month at the end of
         such Interest  Period) shall end on the last Business Day of a calendar
         month;  (C) no such Interest Period shall end after the Initial Term or
         any Renewal Term or after any scheduled  principal  payment date on any
         Loan,  if any  LIBOR  Portion  would  have to be  broken  in order  for
         Borrower to timely make such  principal  payment;  and (D) no more than
         six (6) Portions (Revolving Loan Portions,  Term Loan Portions or Capex
         Loan Portions in the aggregate)  bearing interest based on LIBOR may be
         outstanding at any time. If Borrower fails to notify Lender of the next
         Interest  Period for any LIBOR Portion in accordance  with this Section
         2.1(i),  such  Portion  shall  automatically  convert  to a Prime  Rate
         Portion on the last day of the current  Interest Period  therefor.  2.2
         ADVANCES TO CONSTITUTE ONE LOAN; LOAN PURPOSE. All Loans and advances
by Lender to Borrower  under this Agreement and the Ancillary  Agreements  shall
constitute  one loan and all  Liabilities  of  Borrower  to  Lender  under  this
Agreement and the Ancillary  Agreements shall constitute one general  obligation
secured by the  Collateral.  The  proceeds  of the  initial  Loans or  financial
accommodations made by Lender shall be used to repay 3-


                                       11
              


<PAGE>

D's existing  obligations to Wells Fargo Bank and certain other  creditors,  and
the  proceeds of all Loans or financial  accommodations  made by Lender shall be
used to finance  Borrower's  and  certain  of its  Affiliates'  working  capital
requirements,  all on the terms and subject to the  conditions set forth in this
Agreement and in accordance with applicable law.
         2.3 INTEREST  RATE.  All  computations  of interest and fees under this
Agreement  shall be based on a year of 360 days and actual days  elapsed.  In no
contingency  or event  whatsoever  shall the rate or amount of interest  paid by
Borrower  under this  Agreement or any of the  Ancillary  Agreements  exceed the
maximum  rate or amount  permissible  under  any law which a court of  competent
jurisdiction  shall, in a final  determination,  deem applicable  hereto. In the
event that such a court determines that Lender has received  interest  hereunder
or under any Ancillary  Agreement in excess of the maximum  amount  permitted by
such law,  (i) Lender  shall apply such excess to any unpaid  principal  owed by
Borrower to Lender on the Revolving  Loan first,  and then to the Capex Loan and
Term Loan or, if the amount of such excess  exceeds  the unpaid  balance of such
principal,  Lender shall  promptly  refund such excess  interest to Borrower and
(ii)  the  provisions  hereof  shall  be  deemed  amended  to  provide  for such
permissible rate. All sums paid, or agreed to be paid, by Borrower which are, or
hereafter  may be  construed to be,  compensation  for the use,  forbearance  or
detention  of money  shall,  to the  extent  permitted  by  applicable  law,  be
amortized,  prorated,  spread and allocated throughout the full term of all such
indebtedness until the indebtedness is paid in full.
         2.4      CHANGE OF CIRCUMSTANCES.
                  (A) Inability to Determine  Rates.  If, on or before the first
         day of any Interest  Period of any Loan or Portion,  (i) LIBOR for such
         Interest  Period cannot be adequately and reasonably  determined due to
         the unavailability of funds in, or other circumstances  affecting,  the
         London  interbank  market or (ii) the LIBOR rates of interest  for such
         Loans or  Portions  do not  adequately  and fairly  reflect the cost to
         Lender of making or  maintaining  such Loans or Portions,  Lender shall
         promptly give notice of such condition to Borrower. After the giving of
         any such notice and until Lender shall  otherwise  notify Borrower that
         the  circumstances  giving  rise to such  condition  no  longer  exist,
         Borrower's  right to  request  the  making  of or  conversion  to,  and
         Lender's obligation to make or convert to LIBOR Loans or LIBOR Portions
         of the Type affected by such  condition  shall be suspended.  Any LIBOR
         Loans  or  LIBOR  Portions  of the  Type  affected  by  such  condition
         outstanding  at  the  commencement  of any  such  suspension  shall  be
         converted at the end of the then-current Interest Period for such Loans
         or Portions  into  another Type of Loan or Portion not affected by such
         suspension unless such suspension has then ended.
                  (B) Illegality.  If, after the date of this Agreement, (i) the
         adoption of any Governmental  Rule, (ii) any change in any Governmental
         Rule or the  application of requirements  thereof  (whether such change
         occurs  in  accordance  with  the  terms of such  Governmental  Rule as
         enacted,  as a result of amendment or  otherwise),  (iii) any change in
         the  interpretation  or  administration of any Governmental Rule by any
         Governmental  Authority,  or (iv) compliance by Lender with any request
         or  directive  (whether  or  not  having  the  force  of  law)  of  any
         Governmental Authority (each such occurrence,  a "Change of Law") shall
         make it unlawful or impossible for Lender to make or maintain any LIBOR
         Loan or LIBOR Portion, Lender shall immediately notify Borrower of such
         Change of Law.  Upon receipt of such notice,  (i)  Borrower's  right to
         request the making of or conversion to, and Lender's obligation to make
         or  convert  to, any Loans or  Portions  of the Type  affected  by such
         Change of Law shall


                                       12


<PAGE>

         be  terminated,  and (ii)  Borrower  shall,  at the  request of Lender,
         either  (A)  pursuant  to  Section   2.1(h),   convert  any  such  then
         outstanding  Loans or Portions  into  another Type of Loans or Portions
         not  affected by such Change of Law at the end of the current  Interest
         Period for such Loans or Portions,  or (B) immediately repay or convert
         any such Loans or Portions if Lender shall notify  Borrower that Lender
         may not lawfully  continue to fund and maintain such Loans or Portions.
         Any  conversion or prepayment of Loans or Portions made pursuant to the
         preceding sentence prior to the last day of an Interest Period for such
         Loans or Portions shall be deemed a prepayment  thereof for purposes of
         this Agreement.
                  (C) Increased  Costs. If any Change of Law announced after the
         date of this Agreement:
                          (i)Shall  subject  Lender to any tax,  duty or other
         charge with respect to any LIBOR Loan or LIBOR Portion, or shall change
         the basis of  taxation of payments by Borrower to Lender on such a Loan
         or Portion or in respect to such a Loan or Portion under this Agreement
         (except  for  changes in the rate of taxation on the overall net income
         of Lender); or
                           (ii)  Shall  impose,  modify or hold  applicable  any
         reserve, special deposit or similar requirement against assets held by,
         deposits or other  liabilities  in or for the  account of,  advances or
         loans  by, or any other  acquisition  of funds by Lender  for any LIBOR
         Loan or LIBOR Portion; or
                           (iii)  Shall  impose  on Lender  any other  condition
         related to any LIBOR Loan or LIBOR Portion;
and the effect of any of the  foregoing is to increase the direct cost to Lender
of making,  renewing,  or maintaining any such LIBOR Loan or LIBOR Portion or to
reduce any amount receivable by Lender hereunder;  then Borrower shall from time
to time, upon demand by Lender,  pay to Lender additional  amounts sufficient to
reimburse  Lender for such  increased  direct costs or to compensate  Lender for
such reduced  amounts showing the calculation  thereof in reasonable  detail.  A
certificate  as to the  amount  of such  increased  costs  or  reduced  amounts,
submitted  by Lender to Borrower  shall,  in the absence of manifest  error,  be
conclusive and binding on Borrower for all purposes; provided, however, that the
increased  costs or reduced amounts shall not relate to any period more than 180
days prior to the date of such certificate.
                  (D)  Capital   Requirements.   If,  after  the  date  of  this
         Agreement, Lender determines that (i) any Change of Law announced after
         the date of this  Agreement  affects the amount of capital  required or
         expected to be maintained by Lender or any Person controlling Lender (a
         "Capital  Adequacy   Requirement")  and  (ii)  the  amount  of  capital
         maintained by Lender or such Person which is  attributable  to or based
         upon the Loans or this  Agreement must be increased as a result of such
         Capital  Adequacy  Requirement  (taking into  account  Lender's or such
         Person's policies with respect to capital adequacy), Borrower shall pay
         to Lender or such Person,  upon demand,  such amounts as Lender or such
         Person  shall  determine  are  necessary to  compensate  Lender or such
         Person  for the  increased  costs  to  Lender  or such  Person  of such
         increased  capital. A certificate of Lender setting forth in reasonable
         detail the computation of any such increased costs, delivered by Lender
         to Borrower  shall, in the absence of manifest error, be conclusive and
         binding on  Borrower  for all  purposes;  provided,  however,  that the
         increased  costs or reduced amounts shall not relate to any period more
         than 180 days prior to the date of such  certificate.  2.5 FUNDING LOSS
         INDEMNIFICATION. If Borrower shall (a) repay or prepay any


                                       13


<PAGE>

LIBOR Loan or LIBOR  Portion  on any day other than the last day of an  Interest
Period  therefor  (whether an optional  prepayment,  a mandatory  prepayment,  a
payment upon  acceleration  or otherwise) or (b) fail to borrow  (including  any
conversion  to)  any  LIBOR  Loan  or  LIBOR  Portion  for  which  a  Notice  of
Borrowing/Conversion  has been  delivered to Lender  (whether as a result of the
failure to satisfy any applicable  conditions or otherwise) Borrower shall, upon
demand by Lender,  reimburse  Lender and hold Lender  harmless for all costs and
losses incurred by Lender as a result of such repayment,  prepayment or failure.
Borrower understands that such costs and losses may include, without limitation,
losses  incurred  by Lender as a result of funding and other  contracts  entered
into by Lender to fund a LIBOR Loan or LIBOR  Portion.  If Lender  shall  demand
payment  under this Section 2.5,  Lender shall deliver to Borrower a certificate
setting  forth the amount of costs and losses for which demand is made,  showing
the calculation thereof in reasonable detail. Such a certificate so delivered to
Borrower  shall,  in the absence of manifest error, be conclusive and binding on
Borrower as to the amount of such loss for all purposes.
         2.6      PREPAYMENTS.
                  (A)  Voluntary  Prepayments.  Subject to Section 2.7 below and
         except for the paydown of the  Revolving  Loans from the  collection of
         the Accounts, Borrower may prepay the Loans in whole or in part only if
         (i)  Borrower  gives  Lender  written  notice  (which shall be given by
         first-class  mail or  telecopy  to the  office or the  telecopy  number
         specified  in  Section  13.10)  of  Borrower's  intention  to make such
         prepayments,  at least  one (1)  Business  Day prior to  tendering  the
         prepayments,  (ii)  the  total  amount  of the  prepayments  is a whole
         multiple of  $1,000,000  (or the entire  remaining  balance of the Term
         Loan or the Capex Loan),  and (iii) Borrower pays any accrued  interest
         on the  amount  prepaid  at the  time of  such  prepayment.  Each  such
         prepayment will be applied by Lender to reduce the applicable Loan and,
         in the case of the  Term  Loan  and the  Capex  Notes,  to  reduce  the
         repayment installments in the inverse order of maturity of payments.
                  (B) Mandatory  Prepayments When Overadvances  Exist. If at any
         time the  outstanding  amount of the Revolving Loan exceeds  Collateral
         Availability  or the aggregate  outstanding  Revolving Loan exceeds Ten
         Million Dollars  ($10,000,000) (an "Overadvance"),  whether as a result
         of advances by Lender, a decline in the value of Eligible Accounts,  or
         otherwise,  Borrower shall on demand by Lender make a prepayment in the
         amount of the Overadvance.
         2.7 TERM OF AGREEMENT;  PREPAYMENT;  LIQUIDATED DAMAGES. This Agreement
shall be in effect  until  five (5) years  from the date  hereof  (the  "Initial
Term") and shall be automatically  renewed  thereafter for successive periods of
one year (each a "Renewal Term") unless  terminated as provided below.  Borrower
and Lender  shall have the right to terminate  this  Agreement at the end of the
Initial  Term or at the end of any  Renewal  Term by giving  the other  party at
least sixty (60) days' prior written  notice of such  termination.  In the event
Borrower gives notice of termination  and the Total Facility is not paid in full
at the end of the Initial Term or Renewal Term, as applicable,  upon the request
of  Borrower,  but in  Lender's  sole  discretion,  Lender may  continue to make
advances  under the  Revolving  Loan and renew this  Agreement for an additional
year, upon such terms and conditions as Lender may require.  In the event Lender
does not agree to continue to make advances and renew the term for an additional
year, all Liabilities  shall be immediately due and payable.  This Agreement may
also be  terminated  by  Lender  upon  the  occurrence  of a  Default.  Upon the
effective date of any termination,  all of the Liabilities (including the Notes)
shall become immediately due and payable without presentment,  notice or demand.
Notwithstanding any


                                       14


<PAGE>

termination, until all of the Liabilities shall have been fully and finally paid
and satisfied,  Lender shall be entitled to retain its security  interest in the
Collateral,  Borrower  shall  continue  to remit  collections  of  Accounts  and
proceeds of  Collateral as provided in this  Agreement,  and Lender shall retain
all of its rights and remedies under this Agreement.  During the Initial Term or
any Renewal Term,  Borrower  may, at its option,  upon not less than ninety (90)
days'  prior  written  notice  to  Lender  specifying  the  date of  prepayment,
terminate this Agreement and prepay all of the  Liabilities  hereunder.  In such
event,  Borrower  shall  pay to  Lender  for  loss of the  bargain  and not as a
penalty,  as liquidated  damages and as  compensation  for the costs of Lender's
being  prepared to make funds  available to Borrower  under this  Agreement,  an
amount (the "Prepayment Fee") equal to the following  percentages of the maximum
Total  Facility  during the given  year:  3.0% in the first year  following  the
Closing  Date,  2.0% in the second year  following  the Closing  Date,  and 1.0%
during any year thereafter. In addition,  Borrower shall pay to Lender, upon any
prepayment  in whole or in part of the Term Loan  and/or the Capex  Loan,  a fee
equal to the foregoing percentages of the principal amount so prepaid;  provided
that,  if such  prepayment  is made with the proceeds of equity or  subordinated
debt  issued by  Borrower  or 3-D and  permitted  pursuant  to the terms of this
Agreement,  Borrower  shall pay a fee equal to 1.0% of the  principal  amount so
prepaid (the "Reduced Prepayment Amount"), regardless of the date of prepayment.
If, however,  this Agreement is terminated prior to the end of the Initial Term,
Borrower shall be required at the time of termination to pay (in addition to the
Prepayment Fee described  above) the difference  between the Reduced  Prepayment
Amount and the fee which would  otherwise  have been  applicable to such prepaid
amount  (had  proceeds  of  equity or  subordinated  debt not been used for such
prepayment).  Borrower shall also be  responsible to pay, in every event,  LIBOR
breakage  penalties  pursuant  to Section  2.5,  and if any fixed rate Loans are
outstanding Borrower agrees to pay an additional  prepayment charge equal to the
actual loss, if any, that may be sustained by Lender through redeployment of the
funds loaned to Borrower at the then prevailing interest rates.
         2.8 AUDIT FEE.  Borrower shall pay to Lender its  reasonable  costs and
expenses  incurred during the course of periodic field  examinations and audits,
including  a per diem charge for  examiners  in the field and office at Lender's
then prevailing rate (currently $500 per person per day).
         2.9  CLOSING  FEE.  Borrower  shall pay to  Lender,  in cash,  upon the
execution  of this  Agreement,  a Closing  Fee in the  amount  of Three  Hundred
Thousand Dollars ($300,000).
         2.10  UNUSED LINE FEE.  Borrower  shall pay to Lender,  each month,  an
unused  line fee  equal to  one-half  of one  percent  (0.50%)  per annum of the
difference between the maximum commitment for the Revolving Loan ($10,000,000 as
of the Closing  Date) and the daily  average  outstanding  borrowings  under the
Revolving Loan for the prior month.  The unused line fee shall be in addition to
any other fees or charges owing with respect to the Revolving Loan.


                                       15


<PAGE>

3.       ELIGIBLE ACCOUNTS
         3.1 ELIGIBLE  ACCOUNTS.  Upon Borrower's  delivery to Lender of a Daily
Collateral  Report,  Lender shall  determine  which  individual  Accounts listed
thereon are Eligible  Accounts.  Unless otherwise agreed to by Lender in writing
and except as  specifically  set forth in the proviso at the end of this Section
3.1,  Eligible  Accounts  shall be (i) Accounts of Borrower,  (ii) to the extent
Lender has a first priority  perfected  security interest  therein,  Accounts of
J.R.S.  Exploration  Company,  Ltd.,  and  (iii) to the  extent  owing by PEMEX,
Accounts of Geoevaluaciones,  S.A. de C.V., and Procesos  Interactivos,  S.A. de
C.V.,  and  shall in each  case and at all  times be  subject  to the  following
requirements for eligibility:
                  (A) If the Account  arises from the sale of goods,  such goods
         shall have been shipped or delivered on open account and on an absolute
         sale basis and not on consignment,  on approval or on a  sale-or-return
         basis and  shall  not be  subject  to any  other  repurchase  or return
         agreement and no material part of such goods shall have been  returned,
         repossessed, rejected, lost or damaged;
                  (B) Except as specifically set forth in the proviso at the end
         of this  Section  3.1, if the Account  arises from the  performance  of
         services, such services shall have been performed in full;
                  (C) The Account  shall not be evidenced by chattel paper or an
         instrument of any kind;
                  (D) The Account Debtor  obligated on such Account shall not be
         suspended  from  doing  business,  insolvent  or  the  subject  of  any
         bankruptcy or  insolvency  proceeding of any kind, or the subject of an
         assignment  for the  benefit of  creditors,  or have had a receiver  or
         trustee appointed for a significant  portion of its assets,  and Lender
         shall be satisfied with the creditworthiness of such Account Debtor;
                  (E) The Account Debtor  obligated on such Account shall not be
         a supplier to or creditor  of  Borrower,  except to the extent that the
         aggregate  of  such  Account  Debtor's   Accounts  exceeds   Borrower's
         liabilities (including contingent liabilities) to such Account Debtor;
                  (F) Except as specifically set forth in the proviso at the end
         of this  Section  3.1, if the  Account is owing from an Account  Debtor
         located  outside the United States or Canada (unless the Account Debtor
         is PEMEX),  such Account Debtor shall have  furnished  Borrower with an
         irrevocable  letter  of  credit  issued  or  confirmed  by a  financial
         institution  acceptable  to Lender,  which letter of credit shall be in
         form and  substance  acceptable  to Lender,  pledged to Lender,  and be
         payable  in  Dollars  in an amount  not less than the face value of the
         Account;
                  (G)  The  Account  shall  be  a  valid,   legally  enforceable
         obligation of the Account Debtor,  reduced by the amount of any offset,
         counterclaim  or  defense  denying  liability  thereunder  asserted  in
         writing by such Account Debtor;
                  (H) The  Account  shall be subject to and  covered by Lender's
         perfected security interest and shall not be subject to any other lien,
         claim, encumbrance or security interest;
                 (i)The  Account  shall be  evidenced  by an  invoice or other
         documentation in form acceptable to Lender;
                  (J) The Account  shall not have  remained  unpaid for a period
         exceeding  ninety  (90) days  after the  original  invoice  date of the
         related invoice and not more than fifty percent (50%) of the balance of
         all Accounts owing from the Account Debtor obligated under such Account
         shall have  remained  unpaid for more than  ninety  (90) days after the
         invoice date of the related invoices or otherwise be deemed


                                       16


<PAGE>

         ineligible;
                  (K) If the  Account  Debtor  is  located  in the  State of New
         Jersey or the State of Minnesota, Borrower shall have filed a Notice of
         Business Activities Report with the appropriate agency in New Jersey or
         Minnesota, as applicable, for the then current year;
                  (L) The Account shall not be owing from an employee,  officer,
         agent, director or stockholder of Borrower or any Affiliate or from the
         United States of America or any department,  agency or  instrumentality
         thereof;
                  (M) The aggregate  amount of Accounts  from an Account  Debtor
         owing to any of the Companies  shall not, at any time,  exceed  fifteen
         percent  (15%)  (twenty-five  percent  (25%) in the case of  Occidental
         Petroleum and other major energy companies approved by Lender from time
         to time in its  discretion,  reasonably  exercised,  and thirty percent
         (30%) in the case of PEMEX  and  British  Petroleum)  of the  aggregate
         amount of existing Eligible Accounts;
                  (N) The Account  shall be one against  which Lender is legally
         permitted to make loans and advances;
                  (O) Each of the  warranties and  representations  set forth in
         Section 9.2 shall be  reaffirmed  with  respect to such  Account at the
         time that the most recent  Daily  Collateral  Report was  delivered  to
         Lender;
                  (P) The Account shall not consist of unapplied cash,  deferred
         revenue,  deposits from customers,  Direct Charges or credits in excess
         of ninety (90) days; and
                  (Q) The Account shall otherwise be acceptable to Lender in its
         discretion, reasonably exercised;
provided,  however, that Lender shall deem the following Accounts to be Eligible
Accounts,  subject to the terms specified herein: (i) British Petroleum extended
terms balance owing to Borrower, eligible only through January 31, 1998, subject
to a limit of  $1,200,000  on advances  against such  Accounts  (ii) Accounts of
PEMEX owing to  Geoevaluaciones,  S.A. de C.V., subject to a limit of $3,000,000
on advances  against  such  Accounts  (provided  that the  aggregate of advances
against the British  Petroleum balance described in clause (i) and the amount of
advances against PEMEX Eligible Accounts may not exceed $3,000,000 at any time),
and (iii)  progress  billings,  subject  to a limit of  $1,000,000  on  advances
against such Accounts. 4. PAYMENTS
         4.1 LOAN ACCOUNT;  METHOD OF MAKING  PAYMENTS.  Lender shall maintain a
loan  account  (the "Loan  Account") on its books in which shall be recorded (i)
all loans and advances  made by Lender to Borrower  pursuant to this  Agreement,
(ii) all payments  made by Borrower on all such loans and advances and (iii) all
other appropriate  debits and credits as provided in this Agreement,  including,
without limitation, all fees, charges, expenses and interest. All entries in the
Loan Account shall be made in  accordance  with  Lender's  customary  accounting
practices as in effect from time to time. Unless otherwise agreed to in writing,
all payments  which  Borrower is required to make to Lender under this Agreement
or under any of the Ancillary  Agreements shall be made by appropriate debits to
the Loan Account. Lender may, in its discretion,  elect to bill Borrower for the
amount of any such  payment in which case such amount shall be  immediately  due
and payable  with  interest  thereon at the rate then  applicable  to Prime Rate
Revolving Loan Portions.
         4.2 PAYMENT TERMS. Unless otherwise expressly provided in writing,  the
Liabilities  will be repayable as follows:  (i) interest shall be payable on the
first day of each month (for the immediately  preceding  month) out of the first
collections received with respect


                                       17


<PAGE>

to any proceeds of Collateral,  (ii) fees,  costs,  expenses and similar charges
shall be payable as and when  provided for in this  Agreement  or the  Ancillary
Agreements,  and (iii) the principal balance of the Liabilities shall be payable
from  collections  received  with respect to any proceeds of  Collateral as such
proceeds are received;  provided,  however,  that if at any time the outstanding
principal  balance of the Revolving Loan exceeds the Collateral  Availability or
the outstanding  principal  balance of all of the Liabilities  exceeds the Total
Facility,  Borrower shall  immediately pay to Lender such amount as is necessary
to eliminate  such excess.  Subject to the  foregoing  and to the  provisions of
Section 2.7, the Term Loan will be payable as provided in the Term Note.  All of
the  Liabilities  shall be payable at the address of Lender set forth in Section
13.10. Nothing contained in this Section shall authorize Borrower to sell, lease
or otherwise  dispose of any  Collateral  other than as  expressly  set forth in
Sections 6.4 and 8.3.
         4.3 COLLECTION OF ACCOUNTS AND PAYMENTS.  Lender has established one or
more  special  accounts in Lender's  name with Wells Fargo Bank  located at 1000
Louisiana,  3rd Floor, Houston, Texas 77002 (Attention:  Alan Alexander,  Energy
Department) and Bank One, Colorado,  N.A., located at 1125 17th Street,  Denver,
Colorado 80202-2088 (Attention:  Ann Lyons) (collectively  "Depository Bank") to
which  Borrower will  immediately  deposit all  remittances  and proceeds of the
Collateral in the identical form in which such payment was made, whether by cash
or check.  Borrower hereby agrees that all payments made to such special account
or otherwise received by Lender, whether on the Accounts or as proceeds of other
Collateral or otherwise,  will be the sole and exclusive  property of Lender and
will be applied on account of the  Liabilities.  After allowing one (1) calendar
day for collection  after such funds are received by Lender,  Lender will credit
(conditional  upon final  collection) all payments  received through the special
account  to  the  Loan  Account.  Borrower  and  any  Affiliates,  shareholders,
directors, officers, employees, agents of Borrower and all Persons acting for or
in concert with Borrower who receive any monies,  checks,  notes,  drafts or any
other  payments  relating to or proceeds of Accounts or other  Collateral  which
come into their  possession or under their control shall,  acting as trustee for
Lender,  hold such  property  as the sole and  exclusive  property of Lender and
immediately upon receipt  thereof,  shall remit the same or cause the same to be
remitted, in kind, to Lender. Borrower agrees to pay to Lender any and all fees,
costs and expenses (if any) which Lender incurs in  connection  with opening and
maintaining  the special  account and  depositing  for  collection by Lender any
check or item of payment  received or delivered to Depository Bank in connection
with the  special  account or any  returned  or  collected  checks  received  by
Depository Bank for deposit in the special account.
         4.4  APPLICATION  OF PAYMENTS  AND  COLLECTIONS.  Borrower  irrevocably
waives the right to direct the application of payments and collections  received
by Lender from or on behalf of Borrower,  and Borrower  agrees that Lender shall
have  the  continuing  exclusive  right to apply  and  reapply  any and all such
payments and  collections  against the  Liabilities in such manner as Lender may
deem appropriate,  notwithstanding any entry by Lender upon any of its books and
records.  To the extent that  Borrower  makes a payment or payments to Lender or
Lender  receives  any  payment or  proceeds  of the  Collateral  for  Borrower's
benefit,  which  payment(s)  or  proceeds or any part  thereof are  subsequently
invalidated, declared to be fraudulent or preferential, set aside or required to
be repaid to a trustee,  receiver or any other party under any  bankruptcy  act,
state or federal law,  common law or equitable  cause,  then, to the extent such
payment or  proceeds  received  are so set aside,  invalidated,  required  to be
repaid or the like,  the  Liabilities  or part thereof  intended to be satisfied
shall be  revived  and  shall  continue  in full  force and  effect,  as if such
payments or proceeds had not been


                                       18


<PAGE>

received by Lender.
         4.5  STATEMENTS.   All  advances  and  other  financial  accommodations
hereunder  to Borrower,  and all other  debits and credits  provided for in this
Agreement,  shall be evidenced  by entries  made by Lender in its internal  data
control  systems  showing  the date,  amount  and  reason for each such debit or
credit.  Until  such time as Lender  shall have  rendered  to  Borrower  written
statements of account as provided  herein,  the balance in the Loan Account,  as
set forth on Lender's most recent  statement,  shall be presumptive  evidence of
the  amounts  due and owing to Lender by  Borrower.  Not more than ten (10) days
after the final day of each  calendar  month,  Lender shall render to Borrower a
statement  setting forth the balance of the Loan Account,  including  principal,
interest,  expenses and fees. Each such statement shall be subject to subsequent
adjustment by Lender and Lender's right to reapply  payments in accordance  with
Section 4.4, but shall, absent manifest errors or omissions, be presumed correct
and binding upon Borrower and shall constitute an account stated unless,  within
thirty (30) days after  receipt of any  statement  from Lender,  Borrower  shall
deliver to Lender written objection  thereto  specifying the error or errors, if
any, contained in such statement.
5.       COLLATERAL: GENERAL TERMS
         5.1 SECURITY  INTEREST.  To secure the prompt  payment to Lender of the
Liabilities,  Borrower hereby grants to Lender a continuing security interest in
and to all of Borrower's now owned or existing and hereafter acquired or arising
tangible and  intangible  assets,  including  without  limitation  the following
property and  interest in property of Borrower  whether now owned or existing or
hereafter acquired or arising and wherever located: (i) all Accounts, Inventory,
Equipment, contract rights (including,  without limitation, the right to receive
monies due under all contracts  which may otherwise  prohibit such  assignment),
General Intangibles, tax refunds, chattel paper, instruments, letters of credit,
investment  property,  documents  and  documents  of  title;  (ii)  all  of  the
Borrower's deposit accounts (general or special) including those maintained with
Depository Bank or any other financial institution (iii) all monies, and any and
all  other  property  of  Borrower  now or  hereafter  coming  into  the  actual
possession,  custody or control of Lender, or any Affiliate of Lender in any way
or  for  any  purpose  (whether  for  safekeeping,   deposit,  custody,  pledge,
transmission,  collection or otherwise); (iv) all of Borrower's Computers, books
and records;  and (v) all insurance and other  proceeds of or relating to any of
the foregoing;  and (vi) all accessions and additions to, substitutions for, and
replacements, products and proceeds of any of the foregoing.
         5.2 DISCLOSURE OF SECURITY  INTEREST.  Borrower shall make  appropriate
entries upon its financial  statements and books and records disclosing Lender's
security interest in the Collateral.
         5.3 SPECIAL  COLLATERAL.  Immediately  upon  Borrower's  receipt of any
Collateral which is evidenced or secured by an agreement,  chattel paper, letter
of credit,  instrument or document,  including,  without limitation,  promissory
notes,  documents of title and warehouse  receipts  (the "Special  Collateral"),
Borrower shall deliver the original thereof to Lender or to such agent of Lender
as Lender shall designate, together with appropriate endorsements, the documents
required to draw  thereunder  (as may be relevant to letters of credit) or other
specific  evidence (in form and  substance  acceptable  to Lender) of assignment
thereof to Lender and shall take such  actions as Lender may  require to perfect
Lender's  security  interest  in such  Special  Collateral  and  any  collateral
securing such Special Collateral.
         5.4 FURTHER ASSURANCES.  At Lender's request, Borrower shall, from time
to time,  (i) execute and deliver to Lender all Security  Documents  that Lender
may reasonably request, in form and substance  acceptable to Lender, and pay the
costs of any recording or filing of


                                       19


<PAGE>

the same and (ii) take such  other  actions  as Lender  may  request in order to
fully effect the purposes of this Agreement and to protect Lender's  interest in
the  Collateral.  Upon the occurrence of any uncured  Default,  Borrower  hereby
irrevocably  makes,  constitutes and appoints Lender (and all Persons designated
by  Lender  for that  purpose)  as  Borrower's  true  and  lawful  attorney  and
agent-in-fact to sign the name of Borrower on any of the Security  Documents and
to deliver any of the Security  Documents to such Persons as Lender, in its sole
discretion,  may elect.  This power of  attorney  is coupled  with an  interest.
Borrower agrees that a photocopy or other reproduction of this Agreement or of a
financing statement is sufficient as a financing statement. Upon Borrower's cure
of any Default,  Lender shall have the right to complete any action commenced by
it as attorney or agent-in-fact while such Default was continuing.
         5.5  INSPECTION.  Lender (by any of its officers,  employees or agents)
shall have the right, at any time or times without prior notice,  to inspect the
Collateral, all records related thereto (and to make extracts from such records)
and the  premises  upon  which any of the  Collateral  is  located,  to  discuss
Borrower's  affairs  and  finances  with any Person  and to verify  the  amount,
quality,  value  and  condition  of,  or  any  other  matter  relating  to,  the
Collateral;  provided  that  for so  long  as no  Default  is  continuing,  such
inspections shall occur only during  Borrower's normal business hours.  Borrower
shall pay all costs and  expenses  incurred  by Lender in the course of periodic
audits and  examinations of the Collateral (and any collateral for any Guaranty)
and Borrower's (and any of the Companies')  operations plus a per diem charge at
Lender's  then  prevailing  rate  (currently  $500 per  person  per day) for its
auditors and examiners in the field and office.
         5.6 PERFECTION AND PRIORITY;  LOCATION OF COLLATERAL.  Borrower's chief
executive  office,  principal  place  of  business  and all  other  offices  and
locations of the Collateral and books and records  related  thereto  (including,
without  limitation,  the  Computers,  computer  programs,  printouts  and other
computer materials and records concerning the Collateral but excluding temporary
field locations  established by Borrower in the ordinary course of its business)
are set forth on Exhibit  "C"  attached  hereto.  Borrower  shall not remove its
books  and  records  or the  Collateral  from any  such  locations  (except  for
movements of Equipment in the ordinary course of Borrower's  business within the
states listed on Exhibit "C" and in accordance with the terms of this Agreement)
and shall not open any new offices or  relocate  any of its books and records or
the Collateral  except within the continental  United States of America and with
at least thirty (30) days' prior written notice thereof to Lender.
         5.7 LENDER'S PAYMENT OF CLAIMS ASSERTED AGAINST COLLATERAL. Lender may,
but  shall not be  obligated  to,  at any time or times  hereafter,  in its sole
discretion,  and  without  waiving  any  Default  or waiving  or  releasing  any
obligation,  liability or duty of Borrower under this Agreement or the Ancillary
Agreements, pay, acquire or accept an assignment of any security interest, lien,
claim or other encumbrance asserted by any Person against the Collateral, unless
Borrower is then contesting the related charge,  lien, claim,  security interest
or  encumbrance as permitted by Section 10.3. All sums paid by Lender under this
Section,  including all costs,  fees  (including  reasonable  attorneys'  fees),
expenses and other  charges  relating  thereto,  shall be payable by Borrower to
Lender on demand and shall be additional Liabilities secured by the Collateral.


                                       20


<PAGE>

6.       COLLATERAL: ACCOUNTS
         6.1 VERIFICATION OF ACCOUNTS.  Any of Lender's  officers,  employees or
agents shall have the right,  at any time or times  hereafter,  in Borrower's or
Lender's name or tradestyle  or in the name of a firm of  independent  certified
public accountants  acceptable to Lender, to verify the validity,  amount or any
other  matters  relating  to any  Accounts  by  mail,  telephone,  telegraph  or
otherwise.
         6.2 ASSIGNMENTS,  RECORDS AND DAILY COLLATERAL  REPORT.  Borrower shall
keep accurate and complete  records of its Accounts and, as frequently as Lender
shall require, but not less frequently than twice weekly, Borrower shall deliver
to Lender a Daily  Collateral  Report  and  formal  written  assignments  of all
Accounts,  together with (upon Lender's  request) copies of the invoices related
thereto.  Borrower shall also deliver to Lender, upon demand,  copies (or, after
an  uncured  Default,  originals  if  requested  by  Lender)  of all  documents,
including,  without limitation,  repayment histories, present status reports and
shipment  reports,  relating to the  Accounts  included in any Daily  Collateral
Report and such other  matters  and  information  relating to the status of then
existing Accounts as Lender shall reasonably request.
         6.3 NOTICE  REGARDING  DISPUTED  ACCOUNTS.  Borrower  shall give Lender
prompt notice of any Accounts which, for an Account Debtor,  aggregate in excess
of One Hundred  Thousand  Dollars  ($100,000)  in dispute  between  such Account
Debtor and Borrower.  In addition,  each Daily Collateral  Report shall identify
all disputed  Accounts and disclose,  in reasonable  detail,  the reason for the
dispute, all claims related thereto and the amount in controversy.
         6.4 SALE OR  ENCUMBRANCE OF ACCOUNTS.  Borrower shall not,  without the
prior written consent of Lender, sell, transfer, grant a security interest in or
otherwise  dispose of or encumber  any of its  Accounts to any Person other than
Lender.
7.       COLLATERAL:  INVENTORY
         Borrower shall keep such records with respect to its Inventory, if any,
as Lender  shall  reasonably  request  and shall  provide  copies of the same to
Lender promptly upon request.
8.       COLLATERAL: EQUIPMENT
         8.1 MAINTENANCE OF THE EQUIPMENT.  Borrower shall keep and maintain the
Equipment in good  operating  condition  and repair and shall make all necessary
replacements thereof so that the value, utility and operating efficiency thereof
shall at all times be maintained and preserved and shall promptly  inform Lender
of any material additions to or deletions from the Equipment. Borrower shall not
permit any such  Equipment to become  affixed to real estate in such manner that
such Equipment will become a fixture or an accession to other personal property.
         8.2 EVIDENCE OF OWNERSHIP OF EQUIPMENT.  Borrower shall,  upon Lender's
request,   deliver  to  Lender  all  evidence  of  ownership  of  the  Equipment
(including,  without  limitation,  bills of  sale,  certificates  of  title  and
applications for title).
         8.3  PROCEEDS  OF THE  EQUIPMENT.  Borrower  shall not sell,  transfer,
lease,  grant a security  interest in or  otherwise  dispose of or encumber  the
Equipment  or any part  thereof  to any  Person  other  than  Lender;  provided,
however, that (i) Borrower may complete the sale of up to $400,000 worth of real
estate and related assets in Ohio, currently in progress; and (ii) in any fiscal
year of Borrower,  Borrower may sell or otherwise  dispose of Equipment  with an
aggregate  net book  value not to exceed  Two  Hundred  Fifty  Thousand  Dollars
($250,000).  In the event any Equipment or real estate is sold,  transferred  or
otherwise  disposed of as permitted in this  Section,  Borrower  shall  promptly
notify  Lender of such fact and deliver  all of the cash  proceeds of such sale,
transfer or disposition to Lender, which


                                       21


<PAGE>

proceeds  shall  be  applied  to the  repayment  of the  Liabilities;  provided,
however,  that  with  Lender's  prior  consent,  in  its  discretion  reasonably
exercised,  Borrower may use the proceeds of such sale,  transfer or disposition
of Equipment to finance the  purchase of  replacement  Equipment in which Lender
has a first priority, perfected security interest documented to the satisfaction
of Lender.  Borrower shall deliver to Lender written  evidence of the use of the
proceeds for such  purchase.  All  replacement  Equipment  purchased by Borrower
shall be free and  clear of all  liens,  claims,  security  interests  and other
encumbrances,  except for the security  interest granted to Lender and Permitted
Liens.
         8.4 LOCATION OF EQUIPMENT.  Borrower and the other  Companies  shall at
all times maintain in the United States,  in  jurisdictions  in which Lender has
perfected  its  security  interest  in  Borrower's  and the  Companies'  assets,
Equipment   with  an  orderly   liquidation   value   (determined   to  Lender's
satisfaction) of not less than $20,000,000. Borrower shall deliver a certificate
to Lender  monthly  confirming  and detailing  Borrower's  compliance  with such
covenant. 9. WARRANTIES AND REPRESENTATIONS
         9.1 GENERAL  WARRANTIES  AND  REPRESENTATIONS.  Borrower  warrants  and
represents that:
                  (A)  Existence  and  Qualification.  Borrower is a corporation
         duly organized and validly existing and in good standing under the laws
         of the state of its  incorporation  and is  qualified  or licensed as a
         foreign  corporation to do business in all other countries,  states and
         provinces in which the laws thereof require Borrower to be so qualified
         or licensed;
                  (B) Other Names.  Borrower  has not used,  during the five (5)
         year period  preceding the date of this Agreement,  and does not intend
         to use, any other corporate or fictitious name,  except as disclosed in
         Exhibit "D" attached hereto;
                  (C) Authority and Power.  Borrower has the right and power and
         is duly  authorized and empowered to enter into,  execute,  deliver and
         perform this  Agreement and the  Ancillary  Agreements to which it is a
         party;
                  (D) Compliance with Law and Other  Agreements.  The execution,
         delivery  and  performance  by  Borrower  of  this  Agreement  and  the
         Ancillary Agreements shall not, by their execution or performance,  the
         lapse  of time,  the  giving  of  notice  or  otherwise,  constitute  a
         violation  of  any  applicable  and  material  law,  rule,  regulation,
         judgment,  order or decree or a breach of any  provision  contained  in
         Borrower's  charter documents or by-laws or contained in any agreement,
         instrument,  indenture  or other  document  to which  Borrower is now a
         party or by which it is bound;
                  (E) Use of  Proceeds.  Borrower's  use of the  proceeds of any
         advances  made by Lender is and will  continue to be a legal and proper
         corporate use (duly authorized by its board of directors, in accordance
         with  applicable and material law, rule or regulation)  and such use is
         and will continue to be consistent with all applicable  laws, rules and
         regulations;
                  (F) Governmental  Approvals.  Borrower has, and is current and
         in good standing with respect to, all governmental approvals,  permits,
         certificates, inspections, consents and franchises necessary to conduct
         and to  continue  to conduct  its  present  and  intended  business  as
         heretofore  conducted  by it  and  to  own or  lease  and  operate  its
         properties  as now owned or leased and  operated by it; and to the best
         knowledge of Borrower,  none of said governmental  approvals,  permits,
         certificates,  consents or  franchises  contains  any term,  provision,
         condition or  limitation  more  burdensome  than such as are  generally
         applicable to Persons engaged in the same or similar business as


                                       22


<PAGE>

         Borrower;
                  (G) Solvency.  Borrower now has capital sufficient to carry on
         its business and  transactions  and all businesses and  transactions in
         which it is  about to  engage  and is now  solvent  and able to pay its
         debts as they mature and  Borrower  now owns  property the fair salable
         value of which is greater  than the amount  required to pay  Borrower's
         debts;
                  (H) No  Litigation,  Indebtedness  or  Guaranties.  Except  as
         disclosed on Exhibit "E" attached  hereto,  Borrower has no  litigation
         pending,  or  to  the  best  of  its  knowledge,   threatened,  and  no
         Indebtedness  (except for trade payables arising in the ordinary course
         of its business since the dates  reflected in the  Financials)  and has
         not guaranteed the obligations of any other Person;
                 (i)No Other Adverse  Agreements or Arrangements.  Borrower is
         not a party to any  contract  or  agreement  or subject to any  charge,
         restriction,   judgment,  decree  or  order  materially  and  adversely
         affecting  its  business,  property,  assets,  operations or condition,
         financial  or  otherwise,  and is not a  party  to any  labor  dispute,
         lockout,  strike or walkout relating to any labor contracts and no such
         contract is scheduled to expire during the Initial Term;
                  (J)  Good  Title.   Borrower   has  good,   indefeasible   and
         merchantable title to, and ownership of, the Collateral, free and clear
         of all liens, claims, security interests and other encumbrances, except
         those of Lender and those described on Exhibit "F" attached hereto;
                  (K) No Violation of Laws.  To the best  knowledge of Borrower,
         Borrower  is  not  in  violation  of  any  applicable  statute,   rule,
         regulation or ordinance of any governmental entity, including,  without
         limitation,  the  United  States of  America,  any state,  city,  town,
         municipality,  county  or any  other  jurisdiction,  or of  any  agency
         thereof,   in  any  respect  materially  and  adversely  affecting  the
         Collateral  or Borrower's  business,  property,  assets,  operations or
         condition, financial or otherwise;
                  (L) No Lien or Borrowing Defaults.  Borrower is not in default
         under any indenture, loan agreement,  mortgage, lease, deed of trust or
         other  similar  agreement  relating  to  the  borrowing  of  monies  or
         encumbering of assets to which it is a party or by which it is bound;
                  (M)  Financials.  The  Financials  fairly  present the assets,
         liabilities  and  financial  condition and results of operations of 3-D
         and such other Persons described therein as of the dates thereof; there
         are no  omissions or other facts or  circumstances  which are or may be
         material  and  there has been no  material  and  adverse  change in the
         assets,  liabilities  or financial or other  condition of 3-D or any of
         such other  Persons  since the date of the  Financials;  there exist no
         equity or long  term  investments  in or  outstanding  advances  to any
         Person  not  reflected  in the  Financials;  there  are no  actions  or
         proceedings which are pending or, to the best of Borrower's  knowledge,
         threatened,  against Borrower or any other Person which might result in
         any  material  adverse  change in  Borrower's  financial  condition  or
         materially and adversely affect  Borrower's  operations,  its assets or
         the Collateral;
                  (N) ERISA.  Borrower has received no notice to the effect that
         it is not in full compliance with any of the requirements of ERISA, and
         the  regulations  promulgated  thereunder  and,  to  the  best  of  its
         knowledge,  there  exists no event  described in Section 4043 of ERISA,
         excluding  subsections  4043(b)(2) and 4043 (b)(3) thereof ("Reportable
         Event"), with respect to Borrower,  and neither Borrower nor any Person
         who is a member of Borrower's controlled group for Federal income


                                       23


<PAGE>

         tax purposes has directly or indirectly, caused or permitted any of the
         following   to  occur:   (i)   restated   or   amended   any   pension,
         profit-sharing,  savings,  stock bonus, or other deferred  compensation
         plans established and maintained by it which are subject to ERISA since
         ERISA became  effective with respect to such plans in a manner designed
         to or which would disqualify those plans and their related trusts under
         the applicable  requirements  of the Internal  Revenue Code of 1986, as
         amended (the "IRC");  (ii)  permitted any of its officers to materially
         and  adversely  affect the  qualified  tax-exempt  status of any of its
         pension,  profit-sharing,   savings,  stock  bonus  or  other  deferred
         compensation  plans and  trusts  under  the IRC;  (iii)  engaged  in or
         permitted  any  officer to engage in any  "prohibited  transaction"  as
         defined  in  Section  406 of ERISA  or  Section  4975 of the IRC;  (iv)
         incurred any "accumulated funding deficiency" as defined in Section 302
         of  ERISA or  Section  412(a)  of the IRC,  whether  or not  waived  in
         connection with any pension,  profit-sharing,  savings,  stock bonus or
         other  deferred  compensation  plans;  (v)  taken or failed to take any
         action which caused or may cause a termination of any pension plan in a
         manner which could result in the imposition of a lien on any Borrower's
         property  pursuant  to  Section  4068 of ERISA;  (vi)  failed to notify
         Lender that notice has been received of a "termination"  (as defined in
         ERISA)  of any  "multi-employer  plan" (as  defined  in ERISA) to which
         Borrower has an obligation to  contribute;  (vii)  incurred a "complete
         withdrawal"  (as  defined in ERISA) from any  "multi-employer  plan" to
         which  Borrower has an  obligation  to  contribute;  (viii)  incurred a
         "partial  withdrawal"  (as defined in ERISA)  from any  "multi-employer
         plan" to which Borrower has an obligation to contribute; or (ix) failed
         to notify Lender that notice has been  received from the  Administrator
         of any  "multi-employer  plan" to which  Borrower has an  obligation to
         contribute  that any such plan will be  placed in  "reorganization"  as
         defined in ERISA;
                  (O) Taxes. Borrower has filed all federal, state and local tax
         returns and other reports, or has been included in consolidated returns
         or reports  filed by an Affiliate,  which  Borrower is required by law,
         rule or  regulation  to file and all  Charges  that are due and payable
         have been paid;
                  (P) No Securities.  Borrower's  execution and delivery of this
         Agreement or any of the Ancillary  Agreements  does not directly or, to
         the best  knowledge  of  Borrower,  indirectly  violate  or result in a
         violation  of any  applicable  laws,  rules or  regulations,  including
         without  limitation,  the Securities  Exchange Act of 1934, as amended,
         and  Regulations U, G, T and X of the Board of Governors of the Federal
         Reserve  System  (12 CFR  221,  207,  220 and 224,  respectively),  and
         Borrower  does not own or  intend  to  purchase  or carry  any  "margin
         security," as defined in such Regulations.
                  (Q) Affiliates.  All Persons who are Borrower's  Affiliates at
         this time are identified as such on Exhibit "G" hereto;
                  (R) Subsidiaries.  Exhibit "G" correctly sets forth the names,
         forms  of  legal   entity  and   jurisdictions   of  formation  of  all
         Subsidiaries  of Borrower and all  Subsidiaries  of such  Subsidiaries.
         Except as described in Exhibit "G",  Borrower  does not own any capital
         stock,  partnership  interest,  joint venture  interest or other equity
         interest in any Person.  Unless otherwise indicated in Exhibit "G", all
         of the  outstanding  shares of capital  stock or  partnership  or joint
         venture  interests of each  Subsidiary  of Borrower are owned of record
         and beneficially by Borrower, and all securities and interests so owned
         are duly authorized, validly issued, fully paid, non-


                                       24


<PAGE>

         assessable  and  issued in  compliance  with all  applicable  state and
         federal securities and other laws, and are free and clear of all liens.
         Each  Subsidiary  of Borrower is a legal  entity duly  formed,  validly
         existing and in good  standing  under the laws of its  jurisdiction  of
         formation,  is duly qualified or registered to transact business and is
         in good  standing  in each  jurisdiction  in which the  conduct  of its
         business  or the  ownership  or  leasing of its  properties  makes such
         qualification  or  registration  necessary and has all requisite  legal
         power and  authority  to conduct its  business and to own and lease its
         properties.  Each Subsidiary of Borrower is in compliance with all laws
         and other legal requirements  applicable to its business,  has obtained
         all authorizations,  consents,  approvals, orders, licenses and permits
         from,   and   has   accomplished   all   filings,   registrations   and
         qualifications  with, or obtained  exemptions from any of the foregoing
         from, any governmental agency that are necessary for the transaction of
         its business.
                  (S) Environmental Matters. (i) The operations of Borrower, any
         other  obligor  and  each  of  Borrower's  Subsidiaries  comply  in all
         material respects with all applicable  Environmental Laws; (ii) none of
         the  operations  of Borrower,  any other  obligor or any  Subsidiary of
         Borrower  are  subject to any  judicial  or  administrative  proceeding
         alleging the  violation of any  Environmental  Laws;  (iii) none of the
         operations of Borrower, any other obligor or any Subsidiary of Borrower
         is the subject of any federal or state investigation evaluating whether
         any remedial  action is needed to respond to a release of any Hazardous
         Material into the environment; (iv) none of Borrower, any other obligor
         or any Subsidiary of Borrower has filed any notice under any federal or
         state law indicating past or present treatment,  storage or disposal of
         a  Hazardous  Material  or  reporting a spill or release of a Hazardous
         Material  into the  environment;  and (v) none of  Borrower,  any other
         obligor or any Subsidiary of Borrower has any known material contingent
         liability in connection with any release of any Hazardous Material into
         the environment. The materiality standard used in this Section shall be
         exceeded  if the  facts  giving  rise to a breach  or  breaches  of the
         representations   or  warranties   contained  herein  might  result  in
         liability in excess of Two Hundred Fifty Thousand Dollars ($250,000) in
         the aggregate.
                  (T) No Broker's Fee. No brokerage,  finder's or similar fee or
         commission  is due to any party by reason of  Borrower's  entering into
         this  Agreement  or by reason of any of the  transactions  contemplated
         hereby,  and Borrower shall indemnify and hold Lender harmless from any
         such fees and commissions.  9.2 ACCOUNT WARRANTIES AND REPRESENTATIONS.
         Borrower warrants and represents
that  Lender  may  rely,  in  determining  which  Accounts  listed  on any Daily
Collateral Report are Eligible Accounts, without independent  investigation,  on
all  statements,  warranties  and  representations  made by  Borrower on or with
respect to any such Daily Collateral  Report and, unless otherwise  indicated in
writing by Borrower, that
                  (A) Such  Accounts are genuine,  are in all respects what they
         purport to be, are not reduced to a judgment  and, if  evidenced by any
         instrument, item of chattel paper, agreement, contract or document, are
         evidenced by only one  executed  original  instrument,  item of chattel
         paper,  agreement,  contract,  or  document,  which  original  has been
         endorsed and delivered to Lender;
                  (B) Such Accounts represent undisputed, bona fide transactions
         completed in accordance with the terms and provisions  contained in any
         documents related thereto;
                  
                  (C) The amounts shown on the Daily Collateral  Report, and all
         invoices


                                       25


<PAGE>

         and  statements  delivered to Lender with  respect to any Account,  are
         actually and  absolutely  owing to Borrower and are not  contingent for
         any reason;
                  (D)  Except  as may be  disclosed  on  such  Daily  Collateral
         Report,  there are no setoffs,  counterclaims  or disputes  existing or
         asserted with respect to any Accounts  included on an Daily  Collateral
         Report, and Borrower has not made any agreement with any Account Debtor
         for any deduction from such Account, except for discounts or allowances
         allowed by Borrower in the  ordinary  course of its business for prompt
         payment,  which  discounts and allowances have been disclosed to Lender
         and are  reflected in the  calculation  of the invoice  related to such
         Account;
                  (E) There are no facts, events or occurrences which in any way
         impair the  validity or  enforcement  of any of the Accounts or tend to
         reduce the amount  payable  thereunder  from the amount of the  invoice
         shown on any Daily Collateral Report and on all contracts, invoices and
         statements delivered to Lender with respect thereto;
                  (F) To the best of Borrower's  knowledge,  all Account Debtors
         are solvent and had the  capacity to contract at the time any  contract
         or  other  document  giving  rise to or  evidencing  the  Accounts  was
         executed;
                  (G) The  goods (if  any),  the sale of which  gave rise to the
         Accounts,  (i) were  produced  in full  compliance  with the Fair Labor
         Standards  Act, 29 U.S.C.  ss.ss.  207 et seq., as amended from time to
         time, and (ii) are not subject to any lien, claim, security interest or
         other  encumbrance,  except  those of  Lender,  and  those  removed  or
         terminated prior to the date hereof;
                  (H)  Borrower  has no  knowledge  of any fact or  circumstance
         which  would  impair  the  validity  or  collectability  of  any of the
         Accounts;
                 (i) To  the  best  of  Borrower's  knowledge,  there  are  no
         proceedings  or actions  which are  threatened  or pending  against any
         Account  Debtor which might result in any  material  adverse  change in
         such Account Debtor's financial condition or business; and
                  (J) The  Accounts  have not been  pledged or sold to any other
         Person  or  otherwise  encumbered  and  Borrower  is the  owner  of the
         Accounts  free of all claims,  liens and  encumbrances  except those of
         Lender.
         9.3 INVENTORY  WARRANTIES AND  REPRESENTATIONS.  Borrower  warrants and
represents  that it does not  produce,  purchase  or sell a  material  amount of
Inventory in the ordinary course of its business.
         9.4  AUTOMATIC   WARRANTY  AND   REPRESENTATION  AND  REAFFIRMATION  OF
WARRANTIES  AND  REPRESENTATIONS.  Each  request for an advance made by Borrower
pursuant to this Agreement or the Ancillary  Agreements  shall constitute (i) an
automatic  warranty and representation by Borrower to Lender that there does not
then exist a Default or an Event of Default and (ii) a  reaffirmation  as of the
date of said request of all of the  warranties and  representations  of Borrower
contained in this Agreement and in the Ancillary Agreements.
         9.5 SURVIVAL OF WARRANTIES  AND  REPRESENTATIONS.  Borrower  covenants,
warrants and  represents to Lender that all  representations  and  warranties of
Borrower contained in this Agreement and the Ancillary  Agreements shall be true
at the  time of  Borrower's  execution  of  this  Agreement  and  the  Ancillary
Agreements, and shall survive the execution,  delivery and acceptance hereof and
thereof by the parties  thereto and the  closing of the  transactions  described
herein and therein or related hereto or thereto.


                                       26


<PAGE>

10.      COVENANTS AND CONTINUING AGREEMENTS
         10.1     AFFIRMATIVE COVENANTS.  Borrower covenants that it shall:
                  (A)  Financial  Tests.  Comply  as  of  the  end  of  each  of
         Borrower's  fiscal  quarters with each of the  financial  covenants set
         forth on Schedule 10.1(a) hereto.
                  (B) Bank  Fees.  Pay to Lender,  on demand,  any and all fees,
         costs or expenses  which  Lender or any  Participant  pays to a bank or
         other similar  institution arising out of or in connection with (i) the
         forwarding  to Borrower or any other Person on behalf of  Borrower,  by
         Lender  or any  Participant,  of  proceeds  of loans  or  other  credit
         accommodations  made  by  such  party  to  Borrower  pursuant  to  this
         Agreement  and (ii) the  depositing  for  collection,  by Lender or any
         Participant,  of any check or item of payment  received or delivered to
         such party on account of the Liabilities;
                  (C) Notice of Loss of  Collateral.  Notify Lender  promptly of
         any event or occurrence  causing a material loss or decline in value of
         the  Collateral and the estimated (or actual,  if available)  amount of
         such loss or decline;
                  (D)  Notice  Re  Account  Debtors.  Promptly  upon  Borrower's
         learning thereof, notify Lender of (i) any material delay in Borrower's
         performance of any of its  obligations to any Account Debtor and of any
         assertion  of any claims,  offsets,  defenses or  counterclaims  by any
         Account Debtor and of any allowances or credits granted  (including all
         credits issued for returned or  repossessed  Inventory) or other monies
         advanced  by  Borrower  to any  Account  Debtor  and (ii) all  material
         adverse information relating to the financial or other condition of any
         Account Debtor;
                  (E) Financials. Keep books of account and prepare consolidated
         and  consolidating  financial  statements,  including in such financial
         statements all foreign Companies ("Financials"),  and furnish to Lender
         the  following  (all to be kept and prepared in  accordance  with GAAP,
         unless Borrower's  independent  certified public  accountants concur in
         any changes therein and such changes are disclosed in writing to Lender
         and are consistent with then generally accepted accounting principles):
                          (i)as soon as  available,  but not later than ninety
         (90) days after the close of each fiscal year of 3-D,  consolidated and
         consolidating Financials of 3-D, including in such financial statements
         all foreign  Companies  (including a balance  sheet,  a profit and loss
         statement  and  a  statement  of  cash  flows,   each  with  supporting
         footnotes)  as at the end of such  fiscal  year and for the fiscal year
         then ended all in reasonable  detail as requested by Lender and audited
         by a firm of  independent  certified  public  accountants of recognized
         national  standing  selected by Borrower and containing the unqualified
         opinion of such independent  certified public  accountants with respect
         to the Financials;
                           (ii) as soon as available,  but not later than thirty
         (30) days after the end of each month and each  fiscal  quarter of 3-D,
         unaudited  consolidated and consolidating  Financials of 3-D, including
         in such financial  statements all foreign Companies (including for each
         month a  statement  of profit  and loss for the month  then ended and a
         balance  sheet  as at the  end of  such  month  and,  for  each  fiscal
         quarter-end,  a  statement  of profit and loss and of  surplus  for the
         fiscal quarter then ended, a statement of cash flow, a balance sheet as
         at the end of such quarter,  and a covenant  compliance  certificate in
         the form of Exhibit  "H"  hereto) as at the end of the portion of 3-D's
         fiscal year then  elapsed,  all in  reasonable  detail as  requested by
         Lender and certified by 3-D's principal  financial  officer as prepared
         in accordance with generally accepted accounting  principles and fairly
         presenting the financial


                                       27


<PAGE>

         position  and  results  of  operations  of  3-D  and  its  consolidated
         Subsidiaries for such period;
                           (iii) for Borrower, J.R.S. Exploration Company, Ltd.,
         Geoevaluaciones,  S.A. de C.V.,  and Procesos  Interactivos  Avanzados,
         S.A.  de  C.V.,  individually  and in the  aggregate,  (A) as  soon  as
         possible,  but not later than  fifteen  (15) days after the end of each
         month,  an Accounts aging,  and (B) as soon as possible,  but not later
         than  thirty  (30) days  after the end of each  month,  an aging of all
         accounts  payable,  all in reasonable detail as requested by Lender and
         certified by  Borrower's  principal  financial  officer as accurate and
         complete and prepared in accordance with generally accepted  accounting
         principles;
                           (iv)     daily, a Daily Collateral Report;
                           (v) as soon as  available,  but not later  than sixty
         (60)  days  before  the  beginning  of  each  fiscal  year  of  3-D,  a
         consolidated and consolidating income statement, balance sheet and cash
         flow  projection  for 3-D  for  such  fiscal  year,  including  in such
         documentation all foreign Companies, detailed by quarter, together with
         appropriate supporting documents reasonably acceptable to Lender;
                           (vi) promptly after the sending or filing thereof, as
         the case may be, copies of any proxy statements,  financial  statements
         or reports which 3-D has made available to its  shareholders and copies
         of any regular, periodic and special reports or registration statements
         which 3-D files with the  Securities  and  Exchange  Commission  or any
         governmental  authority  which  may  be  substituted  therefor,  or any
         national securities exchange;
                           (Vii) such other data and information  (financial and
         otherwise)  as  Lender,  from  time to time,  may  reasonably  request,
         bearing  upon  or  related  to  the  Collateral,  Borrower's  financial
         condition or results of its operations,  or the financial  condition of
         any Person who is a Guarantor;
                  (F)  Notice  Re  Ineligibility  of  Accounts.   Notify  Lender
         promptly,  but in no event  later  than two (2) days  after  Borrower's
         learning  thereof,  that  any  Eligible  Account  has  ceased  to be an
         Eligible Account and the reason(s) for such ineligibility;
                  (G)  Notice  Re  Litigation.   Notify  Lender,  promptly  upon
         Borrower's  learning of (i) any  litigation  affecting  Borrower if the
         claim is in excess of $250,000,  whether or not the claim is considered
         by Borrower to be covered by insurance; and (ii) the institution of any
         suit or  administrative  proceeding  which may materially and adversely
         affect the operations,  financial  condition or business of Borrower or
         which may affect Lender's security interest in the Collateral;
                  (H) Copies of  Agreements.  Provide  Lender with copies of all
         leases  with a duration  in excess of six months or similar  agreements
         between  Borrower and any Person,  whether Borrower is lessor or lessee
         thereunder,  and, upon request  provide Lender with copies of any other
         leases,  licenses,  permits or similar agreement relative to Borrower's
         business;
                 (i)Notice of Default.  Notify Lender,  promptly upon learning
         thereof, of any Default or Event of Default;
                  (J)  Environmental  Matters.  Give  written  notice  to Lender
         immediately  upon  receipt of any  notice  that (i) the  operations  of
         Borrower,  any other  obligor or any  Subsidiary of Borrower are not in
         full compliance with  requirements  of applicable  Environmental  Laws;
         (ii)  Borrower,  any other  obligor or any  Subsidiary  of  Borrower is
         subject to any federal or state  investigation  evaluating  whether any
         remedial  action is needed to respond to the  release of any  Hazardous
         Material into the environment;


                                       28


<PAGE>

         or (iii) any properties or assets of Borrower, any other obligor or any
         Subsidiary  of Borrower are subject to an  Environmental  Lien. As used
         herein,  "Environmental Lien" means a lien in favor of any governmental
         entity  for (A) any  liability  under any  Environmental  Laws,  or (B)
         damages arising from or costs incurred by such  governmental  entity in
         response to a release of a  Hazardous  Material  into the  environment.
         Without  limiting the generality of any of Borrower's  other  covenants
         and agreements,  the operations of Borrower, any other obligor and each
         of  Borrower's  Subsidiaries  shall at all times comply in all material
         respects  with  all  applicable  Environmental  Laws  and  post-testing
         procedures  and  requirements.  The  materiality  standard used in this
         Section  shall be  exceeded  if the  facts  giving  rise to a breach or
         breaches of the covenant  contained herein might result in liability in
         excess of Two Hundred Fifty Thousand Dollars  ($250,000) the aggregate;
         and
                  (K)  Guaranty.  Provide  Lender  with and  maintain  in effect
         continuing  guaranties  in form and  substance  satisfactory  to Lender
         ("Guaranties")  and  executed by each of the  following  Affiliates  of
         Borrower:  3-D; 3-D Geophysical of Latin America, Inc., a Cayman Island
         company;  J.R.S.  Exploration  Company,  Ltd.,  a  Canada  corporation;
         Geoevaluaciones,   S.A.  de  C.V.,  a  Mexico  company;   and  Procesos
         Interactivos Avanzados, S.A. de C.V., a Mexico company. The Guaranty of
         3-D shall be secured by a perfected first priority security interest in
         the  stock of  certain  of the  Companies  and the  Guaranty  of J.R.S.
         Exploration  Company,  Ltd.  shall  be  secured  by a  perfected  first
         priority  security  interest in all of the assets of such  Guarantor in
         each case pursuant to security  agreements,  pledge agreements and such
         other documentation as Lender shall require,  all in form and substance
         satisfactory  to Lender  in its sole  discretion.  Each such  Guarantor
         shall make  representations and warranties similar to those of Borrower
         in this  Agreement,  and  shall  agree  to be bound  by  covenants  and
         agreements  similar to those  applicable to Borrower in this Agreement.
         10.2 NEGATIVE COVENANTS.  Borrower covenants that it shall not, without
         the prior
written  consent of Lender,  which consent shall be in the discretion of Lender,
reasonably exercised:
                  (A) Merger. Merge or consolidate with or acquire any Person;
                  (B)  Investments.  Other  than in the  ordinary  course of its
         business, make any investment in the securities of any Person;
                  (C) Dividends. Declare or pay dividends upon any of Borrower's
         Stock or make any distribution of Borrower's property or assets or make
         any loans,  advances or extensions of credit to any Person,  including,
         without  limitation,  any  Affiliate,  officer or employee of Borrower;
         provided that Borrower may issue stock dividends upon its Stock so long
         as the same is in accordance  with all applicable  laws and provided no
         Default has occurred;
                  (D) Loans and  Advances.  Make any loans or other  advances of
         money (other than salary) to officers, directors or stockholders of any
         of the Companies,  or permit the annual salary and all other direct and
         indirect  remuneration  (excluding  stock options) to their officers to
         exceed Seven Hundred Thousand Dollars ($700,000)  individually or Three
         Million Five Hundred Thousand Dollars ($3,500,000) in the aggregate; or
         make loans or other  advances  of money to  Affiliates,  except for (i)
         transfers to J.R.S. Exploration Company, Ltd., Geoevaluaciones, S.A. de
         C.V.,  3-  D  Geophysical   of  Latin   America,   Inc.,  and  Procesos
         Interactivos,  S.A.  de C.V.,  not to  exceed  at any time for any such
         Company the outstanding amount of advances


                                       29


<PAGE>

         made by Lender  to  Borrower  based on the  Eligible  Accounts  of such
         Company,  (ii) loans by Borrower to the  Companies  described in clause
         (i)  hereof  in excess  of the  amounts  permitted  under  clause  (i),
         provided  that no  Default  or Event of  Default  then  exists or would
         result  from the  making of such  loan,  and (iii) in  addition  to the
         foregoing   entities   described  in  clause  (i),  advances  to  other
         Affiliates,  in an amount for each such Affiliate not to exceed $25,000
         at any  time  outstanding  or  $50,000  in the  aggregate  at any  time
         outstanding for all such Affiliates;
                  (E)  Redemptions.   Redeem,  retire,   purchase  or  otherwise
         acquire, directly or indirectly, any of Borrower's Stock;
                  (F) Change in Business. Make any material change in Borrower's
         capital  structure or in any of its business  objectives,  purposes and
         operations which might in any way adversely affect the repayment of the
         Liabilities;
                  (G)  Affiliate  Transactions.  Except as  provided  in Section
         10.2(d),  above, enter into, or be a party to, any transaction with any
         Affiliate,  director, officer or stockholder of Borrower, except in the
         ordinary  course of and  pursuant  to the  reasonable  requirements  of
         Borrower's  business and upon fair and reasonable terms which are fully
         disclosed to Lender and are no less  favorable  to Borrower  than would
         obtain in a comparable  arm's length  transaction  with a Person not an
         Affiliate, director, officer or stockholder of Borrower;
                  (H) Agreements Re Collateral. Enter into any transaction which
         materially and adversely  affects the Collateral or Borrower's  ability
         to  repay  the  Liabilities  or  permit  or  agree  to  any  extension,
         compromise or settlement or make any change or modification of any kind
         or nature  with  respect  to any  Account,  including  any of the terms
         relating thereto;
                 (i) Guaranty.  Guarantee  or  otherwise,  in any way,  become
         liable with respect to the  obligations  or  liabilities of any Person,
         except  (i)  its   Affiliates'   obligations  to  Lender  and  (ii)  by
         endorsement  of  instruments  or items of  payment  for  deposit to the
         general account of Borrower or for delivery to Lender on account of the
         Liabilities;
                  (J)  Deposits  to  Affiliates.  Except as  provided in Section
         10.2(d), above, make deposits to or withdrawals from any of its deposit
         accounts for the benefit of any Affiliate;
                  (K)  Encumbrances.  Except as  otherwise  expressly  permitted
         herein or in the  Ancillary  Agreements,  encumber,  pledge,  mortgage,
         grant a security interest in, assign,  sell, lease or otherwise dispose
         of or transfer,  whether by sale, merger,  consolidation,  liquidation,
         dissolution, or otherwise, any of Borrower's assets;
                  (L)  Indebtedness  for Borrowed Money.  Incur any Indebtedness
         for  borrowed  money in excess of One  Million  Five  Hundred  Thousand
         Dollars ($1,500,000) during any fiscal year of Borrower, other than the
         Liabilities,  except for  Indebtedness  disclosed on Exhibit "J" hereto
         and except for Indebtedness  which is unsecured and is with Persons who
         execute  and  deliver to Lender (in form and  substance  acceptable  to
         Lender)  subordination  agreements  subordinating  their claims against
         Borrower to the payment of the Liabilities;
                  (M) Capital Expenditures.  Make Capital  Expenditures,  in any
         fiscal year which, in the aggregate,  exceed the greater of (i) Sixteen
         Million  Dollars  ($16,000,000)  or  (ii)  an  amount  equal  to 12% of
         Borrower's  gross  revenues,  not to exceed Twenty Five Million Dollars
         ($25,000,000), or;
                  (N)  Affiliate   Accounts.   Except  as  provided  in  Section
         10.2(d)(i), permit


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<PAGE>

         any  Accounts  owing to Borrower  from any  Affiliate  to be payable on
         terms  which  would  not allow  Borrower  to  demand  payment  upon the
         occurrence of a default;
                  (O) Deposit Accounts.  Open, transfer,  close or change any of
         Borrower's  deposit accounts.  A description of all Borrower's  deposit
         accounts is provided in Schedule 10.2 hereto; or
                  (P) 3-D Stock.  Nothing  herein shall be deemed to prohibit or
         otherwise affect or require consent by Lender to any issuance by 3-D of
         any  stock of 3-D or  options  with  respect  thereto  for any  purpose
         whatsoever,   except  to  consummate  a  merger  or  acquisition.  10.3
         CONTESTING CHARGES. Notwithstanding anything to the contrary herein,
Borrower may dispute any Charges  without  prior payment  thereof,  even if such
non-payment  may cause a lien to  attach to  Borrower's  assets,  provided  that
Borrower shall give Lender prompt notice of such dispute and shall be diligently
contesting the same in good faith and by an appropriate  proceeding and there is
no  danger  of a loss or  forfeiture  of any of the  Collateral  or of  Lender's
priority  position with respect to such Collateral and provided further that, if
the same are  potentially  or actually in excess of Two Hundred  Fifty  Thousand
Dollars  ($250,000) in the aggregate at any time hereafter,  Borrower shall give
Lender  such  additional  collateral  and  assurances  as  Lender,  in its  sole
discretion, deems necessary under the circumstances,  immediately upon demand by
Lender.
         10.4 PAYMENT OF CHARGES.  Subject to the  provisions  of Section  10.3,
Borrower shall pay promptly when due all of the Charges.  In the event Borrower,
at any time or times  hereafter,  shall fail to pay the  Charges or to  promptly
obtain the  satisfaction  of such  Charges,  Borrower  shall  promptly so notify
Lender  thereof and Lender may,  without  waiving or releasing any obligation or
liability of Borrower  hereunder or any Default,  in its  discretion  reasonably
exercised,  at any time or  times  thereafter,  make  such  payment  or any part
thereof,  (but shall not be obligated so to do) or obtain such  satisfaction and
take any other action with respect  thereto  which Lender deems  advisable.  All
sums so paid by Lender and any expenses,  including reasonable  attorneys' fees,
court costs,  expenses and other charges relating  thereto,  shall be payable by
Borrower to Lender upon demand and shall be additional Liabilities.
         10.5  INSURANCE;  PAYMENT OF  PREMIUMS.  At its sole cost and  expense,
Borrower shall (i) keep and maintain the  Collateral  insured for the greater of
original cost or replacement  value of the Collateral  against loss or damage by
fire,  theft,  explosion,  sprinklers and all other hazards and risks in amounts
customary  for  companies  of  similar  size  engaged  in the  same  or  similar
businesses;  (ii) if  applicable,  maintain  product  liability  insurance in an
amount  customary  for the  business  conducted by Borrower  and  acceptable  to
Lender; and (iii) general public liability  insurance in an amount  satisfactory
to  Lender  but in no event  less than Ten  Million  Dollars  ($10,000,000)  per
occurrence,  for bodily injury and property damage. All policies of insurance on
the  Collateral  or  otherwise  required  hereunder  shall be in form and amount
satisfactory  to Lender and with insurers  reasonably  recognized as adequate by
Lender. Borrower shall deliver to Lender a copy of each policy of insurance and,
if  requested,  evidence of payment of all premiums  therefor and shall  deliver
renewals of all such policies to Lender at least thirty (30) days prior to their
expiration  dates.  Such policies of insurance shall contain an endorsement,  in
form and substance  acceptable to Lender,  showing all losses payable to Lender.
Such endorsement shall provide that the insurance  companies will give Lender at
least thirty (30) days' prior notice  before any such policy shall be altered or
canceled and that no act or default of Borrower or any other person shall affect
the right of Lender to recover under such policy in case of loss or damage.


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<PAGE>

Borrower  hereby  directs all insurers  under such  policies to pay all proceeds
payable  thereunder  directly  to Lender.  After the  occurrence  and during the
continuance of a Default,  Borrower irrevocably makes,  constitutes and appoints
Lender  (and  all  officers,  employees  or  agents  designated  by  Lender)  as
Borrower's true and lawful attorney and agent-in-fact for the purpose of making,
settling and adjusting  claims under such policies  (provided  that Lender shall
consult with  Borrower  prior to finally  making,  settling or adjusting  claims
under such  policies),  endorsing the name of Borrower in writing or by stamp on
any check,  draft,  instrument or other item of payment for the proceeds of such
policies and for making all  determinations  and decisions  with respect to such
policies.  If  Borrower  shall fail to obtain or  maintain  any of the  policies
required by this  Section  10.5 or to pay any  premium  relating  thereto,  then
Lender,  without  waiving or  releasing  any  obligation  or default by Borrower
hereunder,  may (but shall be under no  obligation to do so) obtain and maintain
such  policies of insurance and pay such premiums and take any other action with
respect thereto which Lender deems  advisable.  All sums so disbursed by Lender,
including  reasonable  attorneys' fees, court costs,  expenses and other charges
relating  thereto,  shall be payable by Borrower to Lender upon demand and shall
be additional Liabilities.
         10.6 SURVIVAL OF OBLIGATIONS UPON  TERMINATION OF AGREEMENT.  Except as
otherwise  expressly  provided  for in  this  Agreement  and  in  the  Ancillary
Agreements, no termination or cancellation (regardless of cause or procedure) of
this Agreement or the Ancillary Agreements shall in any way affect or impair the
powers,  obligations,  duties,  rights, and liabilities of Borrower or Lender in
any way or respect  relating to any transaction or event occurring prior to such
termination  or  cancellation,  the  Collateral,  or any  of  the  undertakings,
agreements,  covenants,  warranties  and  representations  of Borrower or Lender
contained in this Agreement or the Ancillary Agreements.  All such undertakings,
agreements,   covenants,  warranties  and  representations  shall  survive  such
termination or cancellation.
         10.7 ENVIRONMENTAL  INDEMNITY.  Borrower hereby indemnifies Lender, its
successors  and assignees,  and agrees to hold Lender  harmless from and against
any and all losses,  liabilities,  damages, injuries, costs, expenses and claims
of any and every kind whatsoever (including, without limitation, court costs and
attorneys' fees) which at any time or from time to time may be paid, incurred or
suffered by, or asserted against, Lender for, with respect to, or as a direct or
indirect  result of the  violation  by  Borrower,  any other  obligor  or any of
Borrower's  Affiliates,   of  any  laws,  including  but  not  limited  to,  the
Environmental Laws or any laws or regulations  relating to Hazardous  Materials,
treatment,  storage,  disposal,  generation and  transportation,  air, water and
noise pollution, soil or ground or water contamination, the handling, storage or
release into the environment of Hazardous Materials; or with respect to, or as a
direct or indirect result of the presence on or under,  or the escape,  seepage,
leakage, spillage,  discharge,  emission or release from, properties utilized by
Borrower, any other obligor or any of Borrower's  Subsidiaries in the conduct of
their  respective  business  into or  upon  any  land,  the  atmosphere,  or any
watercourse,  body of water or wetland, of any Hazardous  Materials  (including,
without limitation, any losses, liabilities,  damages, injuries, costs, expenses
or claims asserted or arising under the Environmental  Laws); and the provisions
of and  undertakings and  indemnification  set out in this Section shall survive
the  satisfaction  and payment of the  Liabilities  and the  termination of this
Agreement.
         10.8 CHANGE OF CONTROL.  It is  covenanted  and agreed by Borrower that
3-D shall at all times own 100% of the shares of Borrower's capital stock.
         10.9 REVISIONS OR UPDATES. Should any of the information or disclosures
provided


                                       32


<PAGE>

on any of the Schedules or Exhibits  originally  attached hereto become outdated
or incorrect in any material respect,  Borrower promptly shall provide to Lender
such  revisions  or  updates as may be  necessary  or  appropriate  to update or
correct such  Schedule(s)  or  Exhibit(s);  provided  that no such  revisions or
updates shall be deemed to have amended, modified or superseded such Schedule or
Exhibit as originally  attached hereto,  or to have cured any breach of warranty
or  representation  resulting from the inaccuracy or  incompleteness of any such
Schedule  or  Exhibit  unless  and  until  Lender,  in  its  sole  and  absolute
discretion, shall have accepted in writing such revisions or updates.
11.      CONDITIONS PRECEDENT TO CLOSING
                  Lender will not be obligated  to make any  advances  hereunder
unless the following  conditions  precedent have been satisfied as determined by
Lender:
                  (A) Lender shall have  received  landlord  waivers,  mortgagee
         waivers  and  warehouse  agreements  acceptable  to  Lender in its sole
         discretion  from the  owners of such  owned  and  leased  locations  of
         Borrower  with a  duration  in  excess of six  months  as Lender  shall
         determine.  The landlord waivers shall include,  without limitation,  a
         right of Lender to remain on the premises for up to three months;
                  (B) Borrower's  representations  and  warranties  contained in
         this  Agreement  and the  Ancillary  Agreements  shall be  correct  and
         complete;   Borrower   shall  have  performed  and  complied  with  all
         covenants,  agreements,  and  conditions  contained  herein  and in the
         Ancillary  Agreements  which are  required  to have been  performed  or
         complied with; and there shall exist no Default or Event of Default;
                  (C) No material adverse change in the condition, operations or
         prospects,  financial or otherwise,  of any of the Companies shall have
         occurred during the period  commencing with June 30, 1997 and ending on
         the Closing Date ("Interim Period");
                  (D) This  Agreement,  the Guaranties,  all security  documents
         relating to the foregoing  Guaranties,  all other collateral  documents
         and agreements,  promissory notes and other documents,  instruments and
         agreements  required by Lender shall be executed by the parties thereto
         and delivered to Lender in form and substance  acceptable to Lender and
         its counsel;
                  (E)  Borrower  shall have  entered  into one or more  dominion
         account   agreements   with  Lender  and  the  financial   institutions
         maintaining  such  accounts,  all in form and  substance  acceptable to
         Lender;
                  (F) Lender shall have  received  such  opinions of counsel for
         the Companies as Lender may require;
                  (G) Lender shall have  received such  opinions,  if any, as it
         may  require  from  counsel  in Canada  and  Mexico  opining  as to the
         perfection  of Lender's  liens and security  interests in the assets of
         the Companies located in such jurisdictions;
                  (H) Lender  shall  have  received  one or more  pledges of all
         stock of the  Companies  (other than the stock of 3-D),  and shall have
         received the original  stock  certificates  of such Companies with duly
         executed assignments in blank;
                 (i) Lender  shall  have  received   insurance   certificates,
         lender's loss payable endorsements and copies of all insurance policies
         confirming insurance by the Companies in amounts, coverage, form and by
         insurers satisfactory to Lender in its discretion;
                  (J) Lender  shall  have  received  confirmation  that it has a
         first priority  perfected  security interest in the Collateral (and all
         collateral pledged as security for any Guaranty),  subject only to such
         liens and  encumbrances,  if any, as Lender shall have  approved in its
         discretion in writing. Such confirmation shall include, without


                                       33


<PAGE>

         limitation, (i) written confirmation from all relevant jurisdictions of
         the filing and priority of  financing  statements  (or similar  foreign
         filings)  covering the Collateral,  and (ii) written  confirmation from
         the United States Patent and Trademark  Office and any other applicable
         federal,  state  and  international  offices  of the  registration  and
         priority of Lender's  lien on all of Borrower's  intellectual  property
         assets;
                  (K) Lender  shall have  received a  certificate  of  corporate
         status with  respect to each  Company,  dated  within 21 calendar  days
         prior to the  Closing  Date,  from the  Secretary  of State (or similar
         foreign  office,  as  applicable)  of such  Company's  jurisdiction  of
         incorporation, which indicates that such Company is in good standing in
         such jurisdiction;
                  (L)  Lender  shall have  received  certificates  of  corporate
         status  indicating  that each Company is in good  standing as a foreign
         corporation,  dated within 21 calendar  days prior to the Closing Date,
         from the Secretary of State (or similar foreign office,  as applicable)
         of each jurisdiction in which the character of such Company's assets or
         the nature of its activities makes such qualification necessary;
                  (M) None of the Companies shall have entered into any material
         commitment  or  material   transaction   during  the  Interim   Period,
         including, without limitation,  transactions for borrowings and capital
         expenditures,  which are not in the ordinary  course of such  Company's
         business;
                  (N) None of the Companies  shall have made any material change
         in its accounting methods or principles during the Interim Period;
                  (O) No materially  advantageous agreement previously in effect
         between any Company and any other  Person  shall have been  terminated,
         modified or declared to be in default during the Interim Period;
                  (P) All  consents  necessary  to permit the secured  financing
         transaction contemplated by this Agreement and the Ancillary Agreements
         to be  consummated  pursuant  to the terms and  conditions  hereof  and
         thereof shall have been obtained;
                  (Q) Lender shall have received a  description  of all employee
         pension  benefit  plans  (if  any) of the  Companies,  and  shall  have
         confirmed that such plans are funded at a level satisfactory to Lender;
                  (R)  During  the  Interim  Period,  there  shall not have been
         instituted  or  threatened in any court or  administrative  forum,  any
         material  litigation  or  proceeding to which any of the Companies is a
         party;
                  (S) Lender shall have  received  evidence  satisfactory  to it
         that no broker's  fee,  finder's fee or similar fee shall be payable by
         any of the  Companies  or by any other Person in  connection  with this
         Agreement;
                  (T) Lender shall have received  copies of all labor  contracts
         (if any) to  which  any of the  Companies  is a  party,  and all  labor
         contracts  (if  any)  necessary  to the  continuation  of the  business
         operations of the Companies shall be in effect on the Closing Date;
                  (U) On the Closing Date, the present fair salable value of the
         assets of  Borrower  shall be  greater  than the total  liabilities  of
         Borrower,  including,  without limitation,  contingent liabilities, and
         Lender  shall be satisfied  that the present fair salable  value of the
         assets of Borrower  will  continue  thereafter  to be greater  than the
         total   liabilities  of  Borrower,   including,   without   limitation,
         contingent liabilities;
                  (v) On  the  Closing  Date  and  after  giving  effect  to the
         financial  accommodations  contemplated  hereunder,  all of the  assets
         supporting the Liabilities  shall be sufficient in value, as determined
         by Lender, to provide Borrower with


                                       34


<PAGE>

         (a) minimum excess borrowing  availability  under the Revolving Loan of
         $3,000,000,  and (b)  adequate  working  capital to enable  Borrower to
         profitably operate its business;
                  (W)  Subordination   agreements,   no-offset   agreements  and
         intercreditor  agreements in form and substance satisfactory to Lender,
         shall have been  executed and delivered by the Companies and such other
         parties as Lender deems necessary;
                  (X) During the Interim Period,  Lender or its  representatives
         shall have been given  access at all  reasonable  times to inspect  and
         evaluate the Collateral  (and any collateral  pledged by any Guarantor)
         and the  Companies'  books and records;  and the  Companies  shall have
         provided Lender with all financial and other  information  which Lender
         may have reasonably requested;
                  (Y)  Lender  shall  have  received  satisfactory   information
         regarding   the  lawsuit  by  Capilano   International   Inc.   against
         Geoevaluaciones,  S.A.  de C.V.  ("Geo-Mexico"),  and  Lender  shall be
         satisfied in its sole  discretion  (i) with the likely  outcome to such
         lawsuit,  (ii) that an adverse  outcome with  respect  thereto will not
         have a material adverse affect on 3-D or Geo-Mexico, and (iii) that 3-D
         and Geo-Mexico have adequate cash reserves and contingency plans in the
         event of an adverse outcome to such lawsuit;
                  (Z)  Lender  shall  have  received  (i) the  consolidated  and
         consolidating  third fiscal  quarter  financial  statements of 3-D, and
         (ii) the most recently  prepared  projections of the Companies,  all of
         which  must  be  acceptable  to  Lender  in its  discretion  reasonably
         exercised;
                  (AA) Lender shall be satisfied with the Companies'  procedures
         for verifying job completion;
                  (BB)  Lender  shall  have  received  a  certificate  from  the
         secretary or assistant  secretary  of each Company  certifying  (i) the
         adoption  of  resolutions  by the board of  directors  of such  Company
         authorizing the transactions  contemplated hereby, (ii) the articles or
         certificate of incorporation of such Company,  and (iii) the by-laws of
         such Company; and
                  (CC) Lender shall have  received the Closing Fee and all other
         fees and expenses payable on or prior to the Closing Date.
12.      DEFAULT; RIGHTS AND REMEDIES ON DEFAULT
         12.1 DEFAULT. The occurrence of any one or more of the following events
shall constitute a Default:
                  (A) Borrower fails to pay any part of the Liabilities when due
         or declared due or is in default,  beyond any applicable  grace period,
         in the payment of any other  Indebtedness  in excess of $125,000 in the
         aggregate;
                  (B)  Borrower or any  Guarantor  fails or neglects to perform,
         keep or  observe  any other  term,  provision,  condition  or  covenant
         contained in this  Agreement or in the Ancillary  Agreements,  which is
         required to be performed, kept or observed by Borrower or any Guarantor
         and any such failure or neglect  shall  continue for more than five (5)
         days  from the  date of such  failure  or  neglect,  provided  that the
         foregoing  cure  period  shall not apply to a default  with  respect to
         Section 10.2 hereof;
                  (C) A default shall occur and continue  beyond any  applicable
         grace period under any agreement,  document or  instrument,  other than
         this  Agreement or any of the  Ancillary  Agreements,  now or hereafter
         existing,  to which Borrower is a party if as a result thereof Borrower
         is in default of obligations in excess of $125,000 in the aggregate;
                  (D) Any statement, warranty, representation, report, financial
         statement, or


                                       35


<PAGE>

         certificate  made or delivered by Borrower or by any Guarantor,  or any
         of their  officers,  employees  or  agents,  to  Lender is not true and
         correct in any material respect;
                  (E) There  shall  occur any  material  uninsured  damage to or
         loss, theft, or destruction of any of the Collateral;
                  (F) Collateral or any of Borrower's or any  Guarantor's  other
         assets  with an  aggregate  value in excess of $125,000  are  attached,
         seized, levied upon or subjected to a writ or distress warrant, or come
         within the possession of any receiver,  trustee,  custodian or assignee
         for the benefit of creditors and the same is not dismissed or otherwise
         avoided within thirty (30) days  thereafter;  or application is made by
         any Person other than Borrower or any Guarantor for the  appointment of
         a receiver,  trustee,  or custodian for any of the Collateral or any of
         Borrower's  or  any  Guarantor's  other  assets  and  the  same  is not
         dismissed within thirty (30) days after the application therefor;
                  (G) An  application  is made by Borrower or any  Guarantor for
         the  appointment  of a receiver,  trustee or  custodian  for any of the
         Collateral  or any of  Borrower's or any  Guarantor's  other assets;  a
         petition under any section or chapter of the Bankruptcy Code or similar
         law or  regulation  is filed by Borrower or any  Guarantor;  a petition
         under any section or chapter of the  Bankruptcy  Code or similar law or
         regulation  is  filed  against  Borrower  or any  Guarantor  and is not
         dismissed  within  thirty  (30)  days  after  filing;  Borrower  or any
         Guarantor  makes an assignment  for the benefit of its creditors or any
         case or proceeding is filed by or against Borrower or any Guarantor for
         its dissolution, liquidation, or termination; Borrower or any Guarantor
         ceases  to  conduct  its  business  as now  conducted  or is  enjoined,
         restrained or in any way prevented by court order from  conducting  all
         or any material part of its business affairs;
                  (H) Except as  permitted  in Section  10.3,  a notice of lien,
         levy or  assessment  is  filed of  record  with  respect  to all or any
         substantial  portion of  Borrower's  or any  Guarantor's  assets by the
         United States, or any department, agency or instrumentality thereof, or
         by any state, county, municipal or other governmental agency including,
         without limitation,  the Pension Benefit Guaranty  Corporation,  or any
         taxes  or  debts  owing  to any  of the  foregoing  becomes  a lien  or
         encumbrance upon the Collateral or any of Borrower's or any Guarantor's
         other assets and such lien or encumbrance is not released within thirty
         (30) days after its creation;
                 (i)One or more judgments is rendered  against Borrower or any
         Guarantor  in an  aggregate  amount  in  excess  of Two  Hundred  Fifty
         Thousand  Dollars  ($250,000)  or, in the lawsuit  described in Section
         11(y), in excess of Two Million Dollars  ($2,000,000),  and Borrower or
         any  Guarantor,  as  applicable,  fails  to  immediately  satisfy  such
         judgment or fails to bond and stay  enforcement  of such  judgment  and
         commence  appropriate  proceedings  to appeal such judgment  within the
         applicable  appeal  period or, after such appeal is filed,  Borrower or
         any Guarantor, as applicable, fails to diligently prosecute such appeal
         or such appeal is denied;
                  (J)  Borrower  or any  Guarantor  becomes  insolvent  or fails
         generally to pay its debts as they become due;
                  (K)  Borrower   fails  within  fifteen  (15)  days  after  the
         occurrence  of any of the  following  events,  to furnish  Lender  with
         appropriate  notice  thereof:  (i) the happening of a Reportable  Event
         with respect to any profit  sharing or pension  plan  governed by ERISA
         (such notice shall contain the statement of the chief financial


                                       36


<PAGE>

         officer of Borrower  setting forth details as to such Reportable  Event
         and the action which Borrower proposes to take with respect thereto and
         a copy of the notice of such  Reportable  Event to the Pension  Benefit
         Guaranty Corporation), (ii) the termination of any such plan, (iii) the
         appointment of a trustee by an appropriate United States District Court
         to administer any such plan, or (iv) the institution of any proceedings
         by the Pension Benefit Guaranty  Corporation to terminate any such plan
         or to appoint a trustee to administer any such plan;
                  (L)  Borrower  fails to: (i)  furnish to Lender a copy of each
         report which is filed by Borrower with respect to any profit sharing or
         pension plan governed by ERISA  promptly  after the filing thereof with
         the Secretary of Labor or the Pension Benefit  Guaranty  Corporation or
         (ii) notify  Lender  promptly upon receipt by Borrower of any notice of
         the  institution of any proceeding or other actions which may result in
         the termination of any such plans;
                  (M) Any Guarantor  revokes or terminates any Guaranty relating
         to any of the  Liabilities  or any document or  agreement  securing the
         same,  or  defaults  under  the  terms  of any such  Guaranty  or other
         agreement beyond any applicable grace period;
                  (N) Any party (other than Lender) to an  intercreditor  and/or
         subordination  agreement  executed in connection  herewith  shall be in
         default thereunder;
                  (O) A  default  occurs  under  any  agreement,  instrument  or
         document relating to any of the Liabilities  heretofore,  now or at any
         time or times hereafter executed by, or delivered to Lender by Borrower
         or by any Guarantor.  12.2  ACCELERATION OF THE  LIABILITIES.  Upon and
         after the occurrence of a Default,
all of the Liabilities may, at the option of Lender and without demand,  notice,
or legal process of any kind, be declared, and immediately shall become, due and
payable.
         12.3  ADVANCES  DURING CURE PERIOD.  Upon the  occurrence  of a Default
which is subject to any cure period,  Lender may, in its sole discretion,  cease
making further advances during the time such Default remains uncured.
         12.4 DEFAULT RATE.  Upon the  occurrence of a Default,  the Loans shall
bear  interest at a Default Rate equal at all times to three  percent (3%) above
the Prime Rate-based  interest rates provided for such Loans,  such Default rate
to begin upon the  occurrence  of the Default and to be adjusted upon any change
in the Prime Rate as provided herein.
         12.5 REMEDIES. Upon and after the occurrence of a Default, Lender shall
have all of the following rights and remedies:
                  (a) All of the default  rights and remedies of a secured party
         under the California  Commercial Code or any other  applicable law, all
         of which rights and remedies shall be cumulative, and not exclusive, to
         the extent  permitted  by law and in addition  to any other  rights and
         remedies  contained  in  this  Agreement  and in  any of the  Ancillary
         Agreements;
                  (b) The right to (i)  peacefully  enter upon the  premises  of
         Borrower or any other place or places where the  Collateral is located,
         without any  obligation  to pay rent to  Borrower or any other  Person,
         through  self-help and without  judicial  process or first  obtaining a
         final judgment or giving  Borrower notice and opportunity for a hearing
         on the validity of Lender's claim,  and remove the Collateral from such
         premises  and places to the  premises of Lender or any agent of Lender,
         for such time as  Lender  may  require  to  collect  or  liquidate  the
         Collateral,  and/or (ii)  require  Borrower to assemble and deliver the
         Collateral to Lender at a place to be designated by Lender;
                  (c) The right to (i) open  Borrower's mail and collect any and
         all amounts


                                       37


<PAGE>

         due from Account  Debtors or direct that Borrower's mail be diverted to
         a post  office box or other  location  as  determined  by Lender,  (ii)
         notify  Account  Debtors that the Accounts have been assigned to Lender
         and that Lender has a security  interest  therein and (iii) direct such
         Account  Debtors to make all payments due from them upon the  Accounts,
         including the Special  Collateral,  directly to Lender or to a lock box
         designated by Lender.  Lender shall  promptly  furnish  Borrower with a
         copy of any such notice sent and Borrower  hereby  agrees that any such
         notice,   in  Lender's  sole  discretion,   may  be  sent  on  Lender's
         stationery,  in which event, Borrower shall, upon demand,  co-sign such
         notice with Lender;
                  (d) The right to sell, lease or to otherwise dispose of all or
         any   Collateral   in  its  then   condition,   or  after  any  further
         manufacturing  or  processing  thereof,  at public or  private  sale or
         sales, in lots or in bulk, for cash or on credit, all as Lender, in its
         sole discretion,  may deem advisable.  At any such sale or sales of the
         Collateral,  the  Collateral  need not be in view of those  present and
         attending the sale, nor at the same location at which the sale is being
         conducted.  Lender  shall  have the  right  to  conduct  such  sales on
         Borrower's  premises  or  elsewhere  and  shall  have the  right to use
         Borrower's  premises  without  charge  for such  sales for such time or
         times as Lender  may see fit.  Lender is  hereby  granted a license  or
         other  right  to  use,  without  charge,  Borrower's  labels,  patents,
         copyrights,  rights of use of any name,  trade  secrets,  trade  names,
         trademarks and advertising matter, or any property of a similar nature,
         as it pertains to the  Collateral,  in advertising for sale and selling
         any  Collateral  and  Borrower's  rights  under  all  licenses  and all
         franchise  agreements  shall inure to Lender's benefit but Lender shall
         have no obligations thereunder.  Lender may purchase all or any part of
         the Collateral at public or, if permitted by law,  private sale and, in
         lieu of actual payment of such purchase price, may setoff the amount of
         such price against the Liabilities. The proceeds realized from the sale
         of any  Collateral  shall be applied  first to the costs,  expenses and
         attorneys' fees and expenses  incurred by Lender for collection and for
         acquisition,   completion,   protection,  removal,  storage,  sale  and
         delivery  of the  Collateral;  second to  interest  due upon any of the
         Liabilities;  and third to the  principal  of the  Liabilities.  Lender
         shall  account to Borrower for any  surplus.  If any  deficiency  shall
         arise,  Borrower shall remain liable to Lender  therefor.  12.6 NOTICE.
         Borrower agrees that any notice required to be given by Lender of a
sale, lease, or other disposition of any of the Collateral or any other intended
action  by  Lender,  which  is  personally  delivered  to  Borrower  or which is
deposited  in the United  States  mail,  postage  prepaid and duly  addressed to
Borrower at the address set forth in Section 13.10, at least five (5) days prior
to any such public sale, lease or other disposition or other action being taken,
or the time after which any private sale of the Collateral is to be held,  shall
constitute commercially reasonable and fair notice thereof to Borrower.
13.0     MISCELLANEOUS
         13.1  APPOINTMENT  OF LENDER  AS  BORROWER'S  LAWFUL  ATTORNEY-IN-FACT.
Borrower,  irrevocably designates,  makes,  constitutes and appoints Lender (and
all persons  designated  by Lender) as Borrower's  true and lawful  attorney and
agent-in-fact  (this power of attorney is coupled with an interest)  and Lender,
or Lender's agent, may, without notice to Borrower:
                  (a) At any time  hereafter,  for the  purpose  of  protecting,
         preserving or collecting  the  Collateral,  endorse by writing or stamp
         Borrower's  name on any  checks,  notes,  drafts or any  other  payment
         relating to the Collateral which comes into


                                       38


<PAGE>

         the possession of Lender or under Lender's control and deposit the same
         to the account of Lender for application to the Liabilities;
                  (b) At any time after the  occurrence  of an uncured  Event of
         Default,  in Borrower's  or Lender's  name:  (i) demand  payment of the
         Collateral;   (ii)  enforce  payment  of  the   Collateral,   by  legal
         proceedings or otherwise;  (iii) exercise all of Borrower's  rights and
         remedies with respect to the collection of the Collateral; (iv) settle,
         adjust,  compromise,  extend  or renew  the  Accounts  and the  Special
         Collateral;  (v) settle,  adjust or  compromise  any legal  proceedings
         brought to collect the Collateral; (vi) if permitted by applicable law,
         sell or assign the Collateral upon such terms,  for such amounts and at
         such time or times as Lender deems advisable; (vii) satisfy and release
         the  Accounts  and  Special  Collateral;  (viii) take  control,  in any
         manner,  of any item of payment or proceeds referred to in Section 4.3;
         (ix) prepare,  file and sign  Borrower's  name on any proof of claim in
         Bankruptcy or similar document against any Account Debtor; (x) prepare,
         file and sign  Borrower's  name on any  notice of lien,  assignment  or
         satisfaction  of  lien or  similar  document  in  connection  with  the
         Collateral;  (xi) do all acts and things  necessary,  in Lender's  sole
         discretion,  to fulfill  Borrower's  obligations  under this Agreement;
         (xii) endorse by writing or stamp the name of Borrower upon any chattel
         paper, document,  instrument,  invoice, freight bill, bill of lading or
         similar  document or agreement  relating to the Collateral;  and (xiii)
         use the  information  recorded on or contained  in any data  processing
         equipment and computer hardware and software relating to the Collateral
         to which Borrower has access;  provided that,  upon  Borrower's cure of
         any  Default  or Event  of  Default,  Lender  shall  have the  right to
         complete any action commenced by it as attorney or agent-in-fact  while
         such Default or Event of Default was continuing; and
                  (c) At any time  after the  occurrence  of an Event of Default
         notify the post office  authorities  to change the address for delivery
         of Borrower's mail to an address designated by Lender and receive, open
         and dispose of all mail addressed to Borrower.
         13.2   MODIFICATION OF AGREEMENT; ASSIGNMENT OR SALE OF INTEREST.  This
Agreement and the Ancillary Agreements may not be modified,  altered or amended,
except by an  agreement in writing  signed by Borrower and Lender.  Borrower may
not sell,  assign or transfer this Agreement or the Ancillary  Agreements or any
portion hereof or thereof,  including,  without  limitation,  Borrower's  right,
title, interest,  remedies, powers, or duties hereunder or thereunder.  Borrower
hereby consents to Lender's participation,  sale, assignment,  transfer or other
disposition,  at any time or times hereafter, of this Agreement or the Ancillary
Agreements or of any portion hereof or thereof,  including,  without limitation,
Lender's  right,  title,  interest,  remedies,  powers,  or duties  hereunder or
thereunder.
         13.3 ATTORNEYS' FEES AND EXPENSES; LENDER'S OUT-OF-POCKET EXPENSES. If,
at any time or  times,  whether  prior or  subsequent  to the  date  hereof  and
regardless of the  existence of a Default or an Event of Default,  Lender incurs
legal or other costs and  expenses or employs  counsel,  accountants,  advisors,
consultants  and/or other  professionals  for advice or other  representation or
services in connection with:
                  (a) The preparation, negotiation, execution and administration
         of this  Agreement,  all  Ancillary  Agreements,  any  amendment  of or
         modification of this Agreement or the Ancillary  Agreements or any sale
         or  attempted  sale  of  any  interest  herein  to  a  co-lender  or  a
         Participant; or consultation with counsel in connection with any of the
         foregoing or any of the items listed in clauses (b) through (e) of this


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<PAGE>

         Section 13.3;
                  (b) Any  litigation,  contest,  dispute,  suit,  proceeding or
         action (whether instituted by Lender,  Borrower or any other Person) in
         any way  relating to the  Collateral,  this  Agreement,  the  Ancillary
         Agreements or Borrower's affairs;
                  (c) Any  attempt  to  enforce  any  rights  of  Lender  or any
         Participant against Borrower or any other Person which may be obligated
         to  Lender or such  Participant  by  virtue  of this  Agreement  or the
         Ancillary  Agreements,   including,  without  limitation,  the  Account
         Debtors;
                  (d) Any attempt to inspect,  verify,  protect,  collect, sell,
         liquidate or otherwise dispose of any of the Collateral; or
                  (e)  Any  inspection,  verification,  protection,  collection,
         sale,  liquidation  or  other  disposition  of any  of the  Collateral,
         including  without  limitation,  Lender's periodic or special audits of
         Borrower's books and records;
then, in any such event,  the  reasonable  attorneys' and  paralegals'  fees and
expenses arising from such services and all reasonably incurred expenses, costs,
charges  and other  fees of or paid by Lender in any way or  respect  arising in
connection  with or relating to any of the events or actions  described  in this
Section  shall be  payable  by  Borrower  to  Lender  upon  demand  and shall be
additional Liabilities.  Without limiting the generality of the foregoing,  such
expenses,   costs,   charges  and  fees  may  include  bank  charges  and  fees,
accountants'  fees,  costs  and  expenses,   court  costs,  fees  and  expenses,
photocopying and duplicating expenses,  court reporter fees, costs and expenses,
long  distance  telephone  charges,  air  express  charges,   telegram  charges,
secretarial over-time charges, and expenses for travel, lodging and food paid or
incurred in connection with the performance of all such services.
         13.4  WAIVER  BY  LENDER.  Lender's  failure,  at  any  time  or  times
hereafter,  to require  strict  performance by Borrower of any provision of this
Agreement or the Ancillary  Agreements shall not constitute a waiver,  or affect
or diminish  any right of Lender  thereafter  to demand  strict  compliance  and
performance  herewith  or  therewith.  Any  suspension  or waiver by Lender of a
Default  under this  Agreement or the  Ancillary  Agreements  shall not suspend,
waive or  affect  any  other  Default  under  this  Agreement  or the  Ancillary
Agreements,  whether the same is prior or subsequent  thereto and whether of the
same or of a different type. None of the undertakings,  agreements,  warranties,
covenants and  representations  of Borrower  contained in this  Agreement or the
Ancillary  Agreements  and no Default  under  this  Agreement  or the  Ancillary
Agreements  shall be deemed to have been  suspended or waived by Lender,  unless
such suspension or waiver is by an instrument in writing signed by an officer of
Lender and directed to Borrower specifying such suspension or waiver.
         13.5 SEVERABILITY.  Wherever possible, each provision of this Agreement
and the  Ancillary  Agreements  shall be  interpreted  in such  manner  as to be
effective and valid under applicable law, but if any provision of this Agreement
or the Ancillary  Agreements  shall be prohibited by or invalid under applicable
law, such provision  shall be  ineffective to the extent of such  prohibition or
invalidity,  without  invalidating  the  remainder  of  such  provision  or  the
remaining provisions of this Agreement or the Ancillary Agreements.
         13.6  PARTIES;  ENTIRE  AGREEMENT.  This  Agreement  and the  Ancillary
Agreements  shall be binding  upon and inure to the  benefit  of the  respective
successors and assigns of Borrower and Lender. Borrower's successors and assigns
shall include, without limitation,  a trustee,  receiver or debtor-in-possession
of or for Borrower.  Nothing contained in this Section shall be deemed to modify
Section 13.2.  This Agreement is the complete  statement of the agreement by and
between Borrower and Lender and supersedes all prior negotiations,


                                       40


<PAGE>

understandings  and  representations  between  them with  respect to the subject
matter of this Agreement.
         13.7 CONFLICT OF TERMS. The provisions of the Ancillary  Agreements are
incorporated in this Agreement by this reference.  Except as otherwise  provided
in this Agreement and except as otherwise  provided in the Ancillary  Agreements
by specific  reference to the  applicable  provision of this  Agreement,  if any
provision contained in this Agreement is in conflict with, or inconsistent with,
any  provision  in any  Ancillary  Agreement,  the  provision  contained in this
Agreement shall govern and control.
         13.8  WAIVER BY  BORROWER.  Except as  otherwise  provided  for in this
Agreement,  Borrower  waives  (a)  presentment,  demand and  protest,  notice of
protest,  notice  of  presentment,  default,  non-payment,   maturity,  release,
compromise,  settlement,  extension or renewal of any or all  commercial  paper,
accounts, contract rights, documents,  instruments, chattel paper and guaranties
at any time held by Lender on which Borrower may in any way be liable and hereby
ratifies  and  confirms  whatever  Lender may do in this  regard;  (b) except as
otherwise  provided by applicable  law, all rights to notice and a hearing prior
to Lender's taking possession or control of, or to Lender's replevy,  attachment
or levy upon,  the Collateral or any bond or security which might be required by
any court prior to allowing Lender to exercise any of Lender's remedies; and (c)
except as otherwise  provided by applicable  law, the benefit of all  valuation,
appraisement,  extension and exemption laws.  Borrower  acknowledges that it has
been  advised  by its  own  counsel  with  respect  to  this  Agreement  and the
transactions  evidenced  by this  Agreement.  Borrower  further  agrees that (y)
Lender  shall  have no  obligation  to take,  and  Borrower  shall have the sole
responsibility  for taking, any and all steps to preserve rights against any and
all Account  Debtors and against any and all prior parties to any note,  chattel
paper,  draft,  trade  acceptance,  or other instrument for the payment of money
covered by the security  interest whether or not in Lender's  possession and (z)
Lender shall not be  responsible  to Borrower for loss or damage  resulting from
Lender's  failure to enforce  any  Accounts  or to collect  any moneys due or to
become due thereunder or other proceeds constituting Collateral hereunder unless
such  loss  or  damage  results  from  Lender's  gross   negligence  or  willful
misconduct.
         13.9  GOVERNING  LAW,  VENUE.  This  Agreement  has been  delivered for
acceptance by Lender in Los Angeles County,  California and shall be governed by
and construed in accordance  with the internal laws (as opposed to the conflicts
of law  provisions) of the State of California as the same may from time to time
be in effect,  including  without  limitation  the  Uniform  Commercial  Code as
adopted  in  California.   Borrower  hereby  (a)  irrevocably   submits  to  the
jurisdiction  of any state or  federal  court  located  in Los  Angeles  County,
California over any action or proceeding to enforce or defend any matter arising
from or related to this Agreement;  (b) waives  personal  service of any and all
process upon Borrower,  and consents that all such service of process be made by
messenger, certified mail or registered mail directed to Borrower at the address
set forth in Section  13.10 and service so made shall be deemed to be  completed
upon the  earlier of actual  receipt or three (3) days after the same shall have
been posted to Borrower's address; (c) irrevocably waives, to the fullest extent
Borrower  may  effectively  do so, the defense of an  inconvenient  forum to the
maintenance of any such action or  proceeding;  (d) agrees that a final judgment
in any such action or proceeding  shall be conclusive and may be enforced in any
other  jurisdictions  by suit on the judgment or in any other manner provided by
law; and (e) agrees not to  institute  any legal  action or  proceeding  against
Lender or any of Lender's directors,  officers,  employees,  agents or property,
concerning  any matter arising out of or relating to this Agreement in any court
other than one located in Los Angeles County, California. Nothing


                                       41


<PAGE>

in this Section shall affect or impair  Lender's right to serve legal process in
any manner  permitted by law or Lender's right to bring any action or proceeding
against Borrower or Borrower's property in the courts of any other jurisdiction.
         13.10 NOTICE.  Except as otherwise  provided herein or in the Ancillary
Agreements:
                  (a) All  notices,  requests,  demands,  directions  and  other
         communications  provided  for  hereunder  or under any other  Ancillary
         Agreement  must  be in  writing  and  must  be  mailed,  telecopied  or
         delivered to the  appropriate  party at the address set forth below or,
         as to any party  hereto  or to any  Ancillary  Agreement,  at any other
         address  as may be  designated  by it in a written  notice  sent to all
         other parties in accordance with this Section; and
                  (b)  Any  notice,   request,   demand,   direction   or  other
         communication  given by telecopier will be confirmed within 48 hours by
         letter mailed or delivered to the  appropriate  party at its respective
         address.  Except  as  otherwise  expressly  provided  herein  or in any
         Ancillary Agreement, if any notice, request, demand, direction or other
         communication  required or permitted  by any Loan  Document is given by
         mail it will be  effective  on the  earlier  of  receipt  or the  third
         calendar day after  deposit in the United  States mail with first class
         or airmail postage  prepaid;  if given by telecopier,  when sent; or if
         given by personal delivery, when delivered.
                  If to Lender, at:
                  Sanwa Business Credit Corporation
                  550 North Brand Boulevard, Suite 950
                  Glendale, California 91203
                  Attn:  Region Manager
                  Telephone:  (818) 545-0090
                  Telecopier:  (818) 545-0095


                  If to Borrower, at:
                  Northern Geophysical of America, Inc.
                  8226 Park Meadows Drive
                  Littleton, Colorado  80124
                  Attn:  Ronald L. Koons, Vice President & C.F.O.
                  Telephone:  (303) 858-0500
                  Telecopier:  (303) 708-8941
                  Tax Identification Number:  133869239


         13.11 SECTION  TITLES,  ETC.. The Section titles and table of contents,
if any, contained in this Agreement are and shall be without substantive meaning
or content of any kind  whatsoever  and are not a part of the agreement  between
the parties hereto. All references herein to Sections,  paragraphs,  clauses and
other subdivisions refer to the corresponding Sections,  paragraphs, clauses and
other  subdivisions  of  this  Agreement;  and  the  words  "herein",  "hereof",
"hereby",  "hereto",  "hereunder",  and words of  similar  import  refer to this
Agreement as a whole and not to any  particular  Section,  paragraph,  clause or
subdivision hereof. All Exhibits which are referred to herein or attached hereto
are hereby incorporated by reference.
         13.12  COURSE OF  DEALING.  No course of  dealing  between  Lender  and
Borrower or


                                       42


<PAGE>

any third party and no delay or omission  by Lender in  exercising  any right or
remedy  hereunder  or under  any  Ancillary  Agreement  or with  respect  to any
Liabilities  shall operate as a waiver  thereof or of any other right or remedy,
and no single or partial  exercise  thereof shall  preclude any other or further
exercise  thereof or the  exercise of any other right or remedy.  All rights and
remedies of Lender are cumulative.

         13.13  SETOFF.  Without  limiting  any other right of Lender,  whenever
Lender  has the right to  declare  any  Liabilities  to be  immediately  due and
payable  (whether or not it has so  declared),  Lender at its sole  election may
setoff  against the  Liabilities  any and all monies then or thereafter  owed to
Borrower  by Lender  in any  capacity,  whether  or not the  Liabilities  or the
obligation  to pay such monies owed by Lender is then due,  and Lender  shall be
deemed to have  exercised  such right of setoff  immediately at the time of such
election even though any charge therefor is made or entered on Lender's  records
subsequent thereto.

         13.14 NONLIABILITY OF LENDER. Borrower acknowledges and agrees that:

                  (a) Any  inspections  of any  Collateral  made  by or  through
         Lender are for purposes of  administration  of advances made  hereunder
         only and Borrower is not entitled to rely upon the same;

                  (b)  By  accepting  or  approving   anything  required  to  be
         observed,  performed,  fulfilled  or given to Lender  pursuant  to this
         Agreement or the  Ancillary  Agreements,  Lender shall not be deemed to
         have warranted or represented the sufficiency,  legality, effectiveness
         or legal  effect of the same,  or of any term,  provision  or condition
         thereof, and such acceptance or approval thereof shall not constitute a
         warranty or representation to anyone with respect thereto by Lender;

                  (c) The relationship between Borrower and Lender is, and shall
         at all times remain, solely that of a borrower and lender; Lender shall
         not under  any  circumstance  be  construed  to be a  partner  or joint
         venturer of Borrower; Lender shall not under any circumstance be deemed
         to be in a  fiduciary  relationship  with  Borrower;  Lender  does  not
         undertake or assume any  responsibility  or duty to Borrower to select,
         review,  inspect,  supervise,  pass judgment upon or inform Borrower of
         any  matter  in  connection  with its  property  or the  operations  of
         Borrower;  Borrower  shall rely  entirely  upon its own  judgment  with
         respect  to such  matters;  and any  review,  inspection,  supervision,
         exercise of judgment or supply of information  undertaken or assumed by
         Lender in connection  with such matters is solely for the protection of
         Lender and neither  Borrower  nor any other  Person is entitled to rely
         thereon; and

                  (d) Lender  shall not be  responsible  or liable to any Person
         for any loss, damage, liability or claim of any kind relating to injury
         or death to such Persons or damage to property not caused by Lender and
         caused by the actions,  inaction or negligence of Borrower and Borrower
         hereby  indemnifies  and  holds  Lender  harmless  from any such  loss,
         damage, liability or claim.

         13.15 TIME OF THE ESSENCE.  Time is of the essence  hereunder and under
the Ancillary Agreements.

         13.16    INDEMNIFICATION.


                                       43


<PAGE>

         If after receipt of any payment of all or any part of the Indebtedness,
Lender is for any reason  compelled  to  surrender  such  payment to any Person,
because  such  payment is  determined  to be void or voidable  as a  preference,
impermissible  setoff,  or a diversion of trust funds,  or for any other reason,
this Agreement shall continue in full force and Borrower shall be liable to, and
shall  indemnify  and hold  Lender  harmless  for,  the  amount of such  payment
surrendered.  The  provisions  of this  Section  shall be and  remain  effective
notwithstanding  any  contrary  action  which may have  been  taken by Lender in
reasonable  reliance  upon such payment,  and any such contrary  action so taken
shall be without  prejudice to Lender's rights under this Agreement and shall be
deemed to have  been  conditioned  upon such  payment  having  become  final and
irrevocable.  The  provisions of this Section shall survive the  termination  of
this Agreement.

         Borrower  agrees to indemnify,  save and hold  harmless  Lender and its
directors,   officers,   agents,   attorneys  and  employees  (collectively  the
"Indemnitees")  from and against:  (i) Any and all claims,  demands,  actions or
causes of action that are asserted  against any  Indemnitee by any Person if the
claim,  demand,  action or cause of action  directly or indirectly  relates to a
claim, demand,  action or cause of action that such Person asserts or may assert
against  Borrower,  or any Affiliate or any officer,  director or shareholder of
Borrower  and such  claim,  demand,  action or cause of action  arises out of or
relates to this  Agreement or the Ancillary  Agreements,  the use of proceeds of
any advance,  or the  relationship  of Borrower and Lender under this Agreement;
(ii) Any and all  claims,  demands,  actions  or causes of action if the  claim,
demand,  action  or cause of  action  arises  out of or  relates  to  Borrower's
compliance or  noncompliance  with the  requirements of any  environmental  law;
(iii) Any administrative or investigative  proceeding by any governmental agency
arising  out of or  related  to a claim,  demand,  action  or  cause  of  action
described  in  clauses  (i) or (ii)  above;  and (iv)  Any and all  liabilities,
losses,   costs  or  expenses   (including   reasonable   attorneys'   fees  and
disbursements and other  professional  services) that any Indemnitee  suffers or
incurs as a result of the assertion of any foregoing  claim,  demand,  action or
cause  of  action;   provided   that  no   Indemnitee   shall  be   entitled  to
indemnification  for any loss  caused by its own  gross  negligence  or  willful
misconduct.  Each Indemnitee is authorized to employ counsel of its own choosing
in enforcing its rights  hereunder and in defending  against any claim,  demand,
action or cause of action covered by this Section; provided that each Indemnitee
shall endeavor, in connection with any matter covered by this Section which also
involves  other  Indemnitees,  to use  reasonable  efforts to avoid  unnecessary
duplication of effort by counsel for all Indemnitees. Whenever practicable, upon
obtaining  actual  knowledge  of any  event  that  would  entitle  Lender  to be
indemnified  under this  Section,  Lender  shall  endeavor to provide  notice to
Borrower of such fact and Lender shall  cooperate  with  Borrower to endeavor to
minimize the  liabilities  for which Lender is entitled to be  indemnified.  Any
obligation or liability of Borrower to any  Indemnitee  under this Section shall
survive the expiration or termination of this Agreement and the repayment of all
Liabilities and the payment and performance of all other  obligations under this
Agreement owed to Lender.

         13.17 WAIVER OF RIGHT TO TRIAL BY JURY.  THE PARTIES TO THIS  AGREEMENT
ACKNOWLEDGE  THAT JURY TRIALS  OFTEN ENTAIL  ADDITIONAL  EXPENSES AND DELAYS NOT
OCCASIONED BY NONJURY TRIALS.  THE PARTIES TO THIS AGREEMENT AGREE AND STIPULATE
THAT A FAIR TRIAL MAY BE HAD BEFORE A STATE OR FEDERAL JUDGE IN A COURT BY MEANS
OF A BENCH


                                       44


<PAGE>

TRIAL WITHOUT A JURY. IN VIEW OF THE FOREGOING, AND AS A SPECIFICALLY NEGOTIATED
PROVISION  OF THIS  AGREEMENT,  EACH PARTY TO THIS  AGREEMENT  HEREBY  EXPRESSLY
WAIVES  ANY  RIGHT TO TRIAL BY JURY OF ANY  CLAIM,  DEMAND,  ACTION  OR CAUSE OF
ACTION  ARISING  UNDER  THIS  AGREEMENT  OR ANY OTHER  INSTRUMENT,  DOCUMENT  OR
AGREEMENT EXECUTED OR DELIVERED IN CONNECTION HEREWITH,  OR IN ANY WAY CONNECTED
WITH OR RELATED OR INCIDENTAL TO THE DEALINGS OF THE PARTIES HERETO WITH RESPECT
TO THIS  AGREEMENT OR ANY OTHER  INSTRUMENT,  DOCUMENT OR AGREEMENT  EXECUTED OR
DELIVERED IN CONNECTION HEREWITH, OR THE TRANSACTIONS RELATED HERETO OR THERETO,
WHETHER NOW EXISTING OR HEREAFTER  ARISING,  AND WHETHER SOUNDING IN CONTRACT OR
TORT OR  OTHERWISE;  AND EACH PARTY  HEREBY  AGREES AND  CONSENTS  THAT ANY SUCH
CLAIM, DEMAND, ACTION OR CAUSE OF ACTION SHALL BE DECIDED BY COURT TRIAL WITHOUT
A JURY, AND THAT ANY PARTY TO THIS AGREEMENT MAY FILE AN ORIGINAL COUNTERPART OR
A COPY OF THIS SECTION WITH ANY COURT AS WRITTEN  EVIDENCE OF THE CONSENT OF THE
PARTIES HERETO TO THE WAIVER OF THEIR RIGHT TO TRIAL BY JURY.

                  IN WITNESS  WHEREOF,  this Agreement has been duly executed as
of the day and year specified at the beginning hereof.

                                         BORROWER:
                                         ---------

                                         NORTHERN GEOPHYSICAL OF
                                         AMERICA,
                                           INC.


                                         By    /s/ Ronald L. Koons
                                            ---------------------------------

                                         Title  Vice President


                                         LENDER:

                                         SANWA BUSINESS CREDIT
                                         CORPORATION


                                         By    /s/ Timothy K. Turner
                                            ---------------------------------

                                         Title  First Vice President


                                       45


<PAGE>

                                    EXHIBIT A

                                   FINANCIALS
                                 (SEE ATTACHED)


                                       A-1


<PAGE>

                                    EXHIBIT B

                     FORM OF NOTICE OF BORROWING/CONVERSION
                                 (SEE ATTACHED)



                                       B-1


<PAGE>

                                    EXHIBIT C

                                    LOCATIONS

8226 Park Meadows Drive
     Littleton, CO 80124

1)   2361 Cinnabar Loop
     Anchorage, AK  99507

2)   11177 Katy Freeway
     Houston, Texas  77079

3)   2495 W. Mesa Court
     Grand Junction, CO  81505

4)   5723 Roberts Street
     Katy, Texas  77450

5)   5707 State Route 61, Box 32
     Mt. Gilead, OH  43338

6)   599 Lexington Avenue
     Suite 4102
     New York, NY  10022

7)   Ninos Heros No. 51
     Esquina Guadalupel Ramirez
     Col. Tepenan, Del. Xochimilco
     Mexico, D.F.  16020

8)   4750 30th Street SE
     Calgary, Alberta, Canada  T2B 2Z1





The states in which Borrower usually works include:

     1)    California
     2)    Nevada
     3)    Utah
     4)    Colorado
     5)    Wyoming
     6)    Montana
     7)    North Dakota


                                       C-1


<PAGE>


     8)    Kansas
     9)    Oklahoma
     10)   Texas
     11)   Mississippi
     12)   Alaska


The states in which Borrower has worked sporadically in the past and potentially
in the future include:

     1)    Oregon
     2)    Illinois
     3)    Louisiana
     4)    New Mexico


                                       C-2


<PAGE>

                                    EXHIBIT D

                                   TRADENAMES

1)   3-D Geophysical, Inc.

2)   3-D Geophysical of Latin America, Inc.

3)   3-D Geophysical of Canada, Inc.

4)   Geo Acquisition Sub, Inc.

5)   Geoevaluaciones, S.A. de C.V.

6)   Procesos Interactivos Avanzados, S.A. de C.V.

7)   International Production Services, Inc.

8)   JanVo Equities, Ltd.

9)   Cal-Core Properties, Ltd.

10)  Mueller Consulting Service, Ltd.

11)  Siegfried & Siegfried, Ltd.

12)  JRS Exploration Company, Ltd.

13)  Paragon Geophysical, Inc.

14)  Kemp Geophysical Corporation

15)  Northern Geophysical of America, A Joint Venture

16)  Northern Geophysical of America (Alaska), Inc.



                                       D-1


<PAGE>

                                    EXHIBIT E

                                   LITIGATION



1.       Leo  Popp  and  Zbranek  Brothers  v.  Victor  Jerome  Sodia  and  Kemp
         Geophysical  Corporation,  filed in the 23rd Judicial District Court of
         Wharton County, Texas

2.       Kelman Technologies,  Inc. (formerly Capilano  International,  Inc.) v.
         Geoevaluaciones,  S.A.  de C.V.,  filed in  Federal  District  Court in
         Mexico

3.       Karen L. Rudolph v. Northern  Geophysical  of America,  Inc.,  filed in
         United States District Court, Southwestern Division, North Dakota

4.       Crystal Calkins,  f/n/a Crystal Hutzenbiler v. Northern  Geophysical of
         America,  Inc.,  filed in United States  District  Court,  Southwestern
         Division, North Dakota

5.       Domingo  Martinez  Uscanga v.  Geoevaluaciones,  S.A. de C.V., filed in
         Junta Federal 38 de Conciliacion y Arbitraje de Coatzacoalcos, Veracruz

6.       Naftali Mendez Gomez v. PEMEX, Perforadata and Geoevaluaciones, S.A. de
         C.V.,  filed in Junta  Especial  7-Bis de la Federal de  Concilacion  y
         Arbitraje (Labor Federal Court 7-Bis)

7.       Geoevaluaciones,  S.A. de C.V. v.  S.H.C.P.  (Mexican  Tax  Authority),
         filed in Income Tax Office in Nuevo Laredo, Tamaulipas,  Mexico, Docket
         No. 738/97

8.       Geoevaluaciones,  S.A. de C.V. v.  S.H.C.P.  (Mexican  Tax  Authority),
         filed in Income Tax Office in Nuevo Laredo, Tamaulipas,  Mexico, Docket
         No. 739/97

9.       Geoevaluaciones,  S.A. de C.V. v.  S.H.C.P.  (Mexican  Tax  Authority),
         filed in Income Tax Office in Nuevo Laredo, Tamaulipas,  Mexico, Docket
         No. 32420

10.      Elsie  Zahn and  Edwin &  Lillian  Eggemeyer  v.  Kemp  Geophysical,  a
         threatened  action  in Texas  resulting  from an  alleged  trespass  in
         January, 1996

11.      Coby Shorter,  Jr. v. Kemp  Geophysical,  a threatened  action in Texas
         resulting from an alleged trespass in January, 1996


                                       E-1


<PAGE>

                                    EXHIBIT F

                             TITLE TO ASSETS, LIENS



                                       F-1


<PAGE>


                                    EXHIBIT G

                           AFFILIATES AND SUBSIDIARIES

AFFILIATES

1)   3-D Geophysical, Inc., a Delaware corporation

2)   3-D Geophysical of Latin America, Inc., a Cayman Islands company

3)   3-D Geophysical of Canada, Inc., an Alberta Canada company

4)   Geo Acquisition Sub, Inc., a Delaware corporation

5)   Geoevaluaciones, S.A. de C.V., a Mexican company

6)   Procesos Interactivos Avanzados, S.A. de C.V., a Mexican company

7)   International Production Services, Inc., a Texas company

8)   JanVo Equities, Ltd., an Alberta, Canada company

9)   Cal-Core Properties, Ltd., an Alberta, Canada company

10)  Mueller Consulting Service, Ltd., an Alberta, Canada company

11)  Siegfried & Siegfried, Ltd., an Alberta, Canada company

12)  JRS Exploration Company, Ltd., an Alberta, Canada company

13)  Paragon Geophysical, Inc., an Ohio company

14)  Kemp Geophysical Corporation, a Texas company

15)  Northern Geophysical of America, A Joint Venture, a Colorado partnership

16)  Northern Geophysical of America (Alaska), Inc., an Alaska corporation


SUBSIDIARIES

None


                                       G-1


<PAGE>


                                    EXHIBIT H

                     FORM OF COVENANT COMPLIANCE CERTIFICATE
                                 (SEE ATTACHED)



                                       H-1
              




<PAGE>


                                    EXHIBIT I

                         FORM OF DAILY COLLATERAL REPORT

                                 (SEE ATTACHED)



                                       I-1


<PAGE>


                                    EXHIBIT J

                    EXISTING INDEBTEDNESS FOR BORROWED MONEY





                                       J-1


<PAGE>


                                  SCHEDULE 1.30

                                    EQUIPMENT


                                       68


<PAGE>

                                SCHEDULE 10.1(A)

FINANCIAL COVENANTS

NOTE:  All of the following covenants and definitions are on a
consolidated basis for 3-D Geophysical, Inc. and its consolidated subsidiaries

<TABLE>
<CAPTION>


=============================================================================================================================
               COVENANT                                       REQUIRED                                  COMMENTS
=============================================================================================================================
<S>                                       <C>              <C>                               <C>
Indebtedness to Tangible Net                               1997  - 1.3                       Tested quarterly.
Worth Ratio                                                1998  - 1.3                       For purposes of this
                                                           1999  - 1.3                       covenant,
                                                           2000  - 1.3                       "Indebtedness" shall
                                                           2001  - 1.3                       be exclusive of
                                                           2002  - 1.3                       operating leases,
                                                                                             contingent
                                                                                             liabilities
                                                                                             arising
                                                                                             out
                                                                                             of
                                                                                             lawsuits
                                                                                             not
                                                                                             yet
                                                                                             ripened
                                                                                             into
                                                                                             judgments,
                                                                                             performance
                                                                                             and
                                                                                             importation
                                                                                             bonds
                                                                                             and
                                                                                             deferred
                                                                                             taxes.
- -----------------------------------------------------------------------------------------------------------------------------
Tangible Net Worth                        Closing Date             $38,000,000               Tested quarterly
("TNW")
                                          At 12/31/97              $38,000,000

                                          Thereafter Previous year-end TNW plus the following amount
                                          1998
                                          1st quarter                 $450,000
                                          2nd quarter                 $450,000
                                          3rd quarter                 $750,000
                                          4th quarter                 $950,000

                                          1999
                                          1st quarter                 $300,000
                                          2nd quarter                 $300,000
                                          3rd quarter                 $700,000
                                          4th quarter                 $800,000

=============================================================================================================================
</TABLE>


                                       68


<PAGE>

<TABLE>
<CAPTION>

=============================================================================================================================
<S>                                       <C>                         <C>                    <C>
                                          2000
                                          1st quarter                 $450,000
                                          2nd quarter                 $450,000
                                          3rd quarter                 $750,000
                                          4th quarter                 $950,000

                                          2001
                                          1st quarter                 $500,000
                                          2nd quarter                 $500,000
                                          3rd quarter               $1,000,000
                                          4th quarter               $1,200,000

                                          2002
                                          1st quarter                 $650,000
                                          2nd quarter                 $650,000
                                          3rd quarter               $1,200,000
                                          4th quarter               $1,450,000

- -----------------------------------------------------------------------------------------------------------------------------
Cash Flow Coverage Ratio                                   1997  - 1.05                      1997 will be a 4th
                                                           1998  - 1.05                      quarter test only.
                                                           1999  - 1.05
                                                           2000  - 1.10                      1998 will be tested
                                                           2001  - 1.15                      each quarter based
                                                           2002  - 1.20                      on the following
                                                                                             trailing levels:

                                                                                             1st quarter - trailing
                                                                                             6 months

                                                                                             2nd quarter - trailing
                                                                                             9 months

                                                                                             3rd quarter - trailing
                                                                                             12 months

                                                                                             4th quarter - trailing
                                                                                             12 months

                                                                                             1999 and thereafter
                                                                                             will be tested each
                                                                                             quarter on a trailing
                                                                                             12 month basis
</TABLE>


                                       68


<PAGE>

<TABLE>

- -----------------------------------------------------------------------------------------------------------------------------
<S>                                       <C>                    <C>                         <C>                  
Net Income (determined in                 1997                                               1997 will be a 4th
accordance with generally                 4th quarter            $200,000 for the            quarter test only.
accepted accounting                                              quarter
principles, consistently                                                                     1998 will be tested
applied)                                  1998                                               each quarter based
                                          ----
                                          1st quarter             $  900,000                 on the following
                                          2nd quarter             $  900,000                 trailing levels:
                                          3rd quarter             $1,500,000
                                          4th quarter             $1,900,000                 1st quarter - trailing
                                                                                             6 months
                                          1999
                                          1st quarter             $1,900,000                 2nd quarter - trailing
                                          2nd quarter             $1,800,000                 9 months
                                          3rd quarter             $1,700,000
                                          4th quarter             $1,600,000                 3rd quarter - trailing
                                                                                             12 months
                                          2000
                                          1st quarter             $1,700,000                 4th quarter - trailing
                                          2nd quarter             $1,700,000                 12 months
                                          3rd quarter             $1,800,000
                                          4th quarter             $1,900,000                 1999 and thereafter
                                                                                             will be tested each
                                          2001                                               quarter on a trailing
                                          1st quarter             $2,000,000                 12 month basis
                                          2nd quarter             $2,100,000
                                          3rd quarter             $2,300,000
                                          4th quarter             $2,400,000

                                          2002
                                          1st quarter             $2,500,000
                                          2nd quarter             $2,600,000
                                          3rd quarter             $2,800,000
                                          4th quarter             $2,900,000
=============================================================================================================================
</TABLE>


                                       68


<PAGE>

                                  SCHEDULE 10.2

                                DEPOSIT ACCOUNTS

<TABLE>
<CAPTION>

Bank or Institution                            Acct.             Account No.            Address
                                               Name

<S>                                            <C>               <C>                    <C>                 
1)   Wells Fargo Bank                          3-D               4159499706             Energy Department
                                               3-D               4159677962             1000 Louisiana
                                               NGA               4159677921             3rd Floor
                                               NGA               4159677939             Houston, Texas 77002
                                               NGA               4159677913
                                               3-D               4159677947
1)   Bank One, Colorado, N.A.                  NGA               1283238127             P.O. Box 5586
                                               NGA               1283236881             Denver, CO 80217-5586
                                               3-D               1283238135             1125 17th Street
                                               3-D               616285722              Denver, CO 80202-2088
                                               NGA               616285714              Attention: Ann Lyons
                                               3-D               616285730
1)   Bank One, N.A.                            Paragon           789068228              Department 1045
                                               Paragon           789065628              Columbus, OH 43271-1045
                                               Paragon           789068201
1)   Norwest Bank                              3-D               2693022920             2350 East Arapahoe Road
                                               3-D               2698019346             Littleton, CO 80122
1)   Chase Manhattan Bank                      3-D               031173041              1211 Avenue of the Americas
                                                                                        36th Floor
                                                                                        New York, NY 10036
1)   Laredo National Bank                      GEO               80106218               Houston, Texas
1)   Barclays Bank PLC                                           2774282                P.O. Box 68
                                                                                        Georgetown, Grand Cayman,
                                                                                        BWI
1)   Banco Wiese                                                 1484280                051 Camino Real
                                                                 3475131                Lima, Peru

1)   Banco Santa Cruz de la Sierra                               1000104200302241       Santa Cruz, Bolivia

1)   Royal Bank of Canada                                        1080018                Calgary, Alberta, Canada
</TABLE>


                                       68


<PAGE>

<TABLE>
<S>                                                              <C>                    <C>                 
1)   Alberta Treasury Branches                                   730000005124           Calgary, Alberta, Canada
                                                                 730000005170
                                                                 730000005102
                                                                 730000007824
                                                                 730000008624
                                                                 730000009424
                                                                 730000010824
                                                                 730000011624
                                                                 730000012424
                                                                 730000013224
                                                                 730000016724
                                                                 730000163324
                                                                 730000164124
                                                                 730000018324
                                                                 730000019124
                                                                 730000020524
1)   Banca Serfin, S.A.                                          40003113425            Renosa, Tamualipas, Mexico
1)   Banca Serfin, S.A.                                          0530120808781          Posa Rica, Veracruz, Mexico
1)   Banca Serfin, S.A.                                          10604018686            Soledad de Doblado,
                                                                                        Veracruz, Mexico
1)   Banca Serfin, S.A.                                          03707382927            General Bravo, N.L., Mexico
1)   Banca Serfin, S.A.                                          09006053748            Mexico City, Mexico
                                                                 09009412285
1)   Banco Inverlar, S.A.                                        9275185                Mexico City, Mexico
1)   Banamex, S.A.                                               3630757                Mexico City, Mexico
                                                                 9275185
1)   Banamex, S.A.                                               2036102                Posa Rica, Veracruz, Mexico
1)   Banamex, S.A.                                               3020414                Reynosa, Tamulipas, Mexico
1)   Bancomer, S.A.                                              181788                 Laredo, Tamulipas, Mexico
1)   Inversiones Serfin                                          09009412285            Mexico City, Mexico
1)   Inversiones Banamex                                         71676560               Mexico City, Mexico

1)   Banco Continental/Tarapoto                               00110310080100014926   Tarapota, Peru

Abbreviations Summary:
"3-D" = 3-D Geophysical, Inc.
"NGA" = Northern Geophysical of America, Inc.
"Paragon" = Paragon Geophysical, Inc.
"GEO" = Geoevaluaciones, S.A. de C.V.
</TABLE>


                                       68



                                    TERM NOTE

$10,000,000                                              Los Angeles, California
                                                         As of November 17, 1997
                                                     
         FOR VALUE  RECEIVED,  the  undersigned  promises to pay to the order of
SANWA BUSINESS CREDIT CORPORATION, a Delaware corporation (hereinafter "Lender")
at its  offices  located at 550 North  Brand  Boulevard,  Suite  950,  Glendale,
California  91203, or such other place as Lender may from time to time designate
in writing,  in lawful money of the United States of America,  the principal sum
of Ten Million Dollars ($10,000,000),  plus interest from the date hereof on the
unpaid principal balance, as set forth herein.

         PRINCIPAL. The principal sum hereof shall be payable as follows:

         A. Fifty-nine (59) monthly installments of $119,048 each, commencing on
December  1, 1997 and  continuing  on the first  day of each  consecutive  month
thereafter through and including November 1, 2002; and

         B. The entire unpaid principal  balance,  together with all accrued and
unpaid  interest  thereon and any other amounts due hereunder,  shall be due and
payable on November 16, 2002.

         INTEREST.  Interest  shall be  computed  at the rates and in the manner
provided in the Agreement  (as defined  below) and shall be payable on the first
day of each and every month (commencing December 1, 1997).

         ADDITIONAL PROVISIONS. At the option of Lender, either unpaid principal
or  interest  or both may be  charged to the  undersigned's  loan  account  with
Lender.

         The makers,  endorsers  and  guarantors  of this Term Note hereby waive
presentment for payment, demand, notice of non-payment and dishonor, protest and
notice of protest;  WAIVE TRIAL BY JURY in any action and/or proceeding  arising
on,  out of or under or by reason of this Term Note;  consent  to any  renewals,
extensions and partial  payments of this Term Note or any indebtedness for which
it is given,  and consent that no such renewals  extensions or partial  payments
shall discharge any party hereto from liability hereon in whole or in part. If a
petition under any provision of the U.S. Bankruptcy Code or any other insolvency
statute  for any relief  thereunder  shall be filed  after the date hereof by or
against any maker,  endorser or  guarantor  hereof,  then this Term Note and all
other existing  obligations  of every kind of each maker,  endorser or guarantor
hereof to the holder hereof shall become immediately due and payable.

         It is  expressly  agreed  that if  default  be made in  payment  of any
principal or


<PAGE>

interest  installment,  as  above  provided,  or in the  payment  of  any  other
indebtedness  owing to the holder of this Term Note,  the then unpaid  principal
balance due and owing on this Term Note, together with interest accrued thereon,
shall  forthwith  become due and  payable  at the  option of the holder  hereof,
without  presentment,  demand,  protest or notice of protest of any kind, all of
which are hereby expressly waived.

         This  Term  Note  is  secured  by (a)  the  Collateral  pledged  by the
undersigned pursuant to that certain Loan and Security Agreement dated as of the
date  hereof  (the  "Agreement")  between the  undersigned  and Lender,  (b) the
collateral  pledged  by  the  undersigned  pursuant  to  that  certain  Security
Agreement  (Intellectual  Property)  dated as of the  date  hereof  between  the
undersigned and Lender,  and (c) any other collateral  heretofore or at any time
hereafter  pledged by the undersigned to Lender.  The Agreement and the Security
Agreement (Intellectual Property) are hereby incorporated herein in full by this
reference. Capitalized terms used but not defined herein shall have the meanings
given them in the  Agreement.  Any Default under and as defined in the Agreement
shall  constitute a default  hereunder.  If it shall become  necessary to employ
counsel to collect  this  obligation,  or to protect or  foreclose  the security
therefor,  the  undersigned  also agrees to pay reasonable  attorneys'  fees and
costs for the  services of such  counsel,  whether or not suit is brought.  This
Term Note may be prepaid subject to the terms and conditions of the Agreement.

         Lender  shall not be deemed to have waived any of its rights  hereunder
or under any other  agreement,  instrument  or paper  signed by the maker unless
such waiver is in writing and signed by Lender. No delay or omission on the part
of Lender in exercising  any right shall  operate as a waiver  thereof or of any
other right. A waiver upon any one occasion shall not be construed as a bar or a
waiver of any right or remedy as to any future occasion nor shall it establish a
custom or course of dealing.

         This Term Note may not be  changed,  modified,  amended  or  terminated
orally.  The validity of this Term Note, its  construction,  interpretation  and
enforcement,  and the rights of the parties  hereunder shall be determined under
the laws of the State of California.

                      [THIS SPACE INTENTIONALLY LEFT BLANK]


                                      - 2 -

<PAGE>

         Notwithstanding  anything herein to the contrary, in the event that the
Agreement is terminated by the undersigned or by Lender,  then the entire unpaid
principal  balance  of this Term  Note,  together  with all  accrued  and unpaid
interest,  shall become immediately due and payable in full without presentment,
notice or demand of any kind.

                                              NORTHERN GEOPHYSICAL OF AMERICA,
                                                INC.


                                              By:  /s/ Ronald L. Koons
                                                   -------------------
                                              Name:  Ronald L. Koons
                                              Title: Vice President


                                      - 3 -

                   SECURITY AGREEMENT OF 3-D GEOPHYSICAL, INC.


         This  Security  Agreement  is entered  into as November 17, 1997 by and
between 3-D Geophysical,  Inc., a Delaware  corporation  ("Debtor"),  located at
8226 Park Meadows Drive,  Littleton,  Colorado 80124,  and SANWA BUSINESS CREDIT
CORPORATION, a corporation ("Secured Party"), located at 550 N. Brand Boulevard,
Suite 950, Glendale, California 91203.

         1. Grant of Security Interest.  Debtor hereby grants to Secured Party a
continuing lien on and security  interest in the property  described or referred
to in  Paragraph  2 below  (collectively,  the  "Collateral")  to secure  prompt
payment and full  performance of the liabilities  described in Paragraph 3 below
(collectively, the "Liabilities").

         2. Collateral. The Collateral consists of all of Debtor's now owned and
hereafter acquired accounts,  inventory,  equipment,  fixtures, contract rights,
general intangibles, chattel paper, instruments, investment property, documents,
and other property;  including without limitation,  the property described below
and the proceeds and products thereof:

              (a) all goods of Debtor, including without limitation,  machinery,
equipment,  furniture,  furnishings,  fixtures, tools, parts, supplies and motor
vehicles of every kind and  description and all  improvements  thereto which the
Debtor  now  owns or in  which  Debtor  may have or may  hereafter  acquire  any
interest, together with all customer lists and records of Debtor's business;

              (b) all  inventory of Debtor,  including,  but not limited to, all
merchandise,  raw  materials,  parts,  supplies,  work in process,  and finished
products  intended for sale,  of every kind and  description  now or at any time
hereafter owned by and in the custody or possession  actual or constructive,  of
Debtor,  including such inventory as is temporarily  out of Debtor's  custody or
possession  and  including  insurance  proceeds,  resulting  from  the  sale and
disposition  of any of the  foregoing,  including,  among other things,  but not
limited to, raw materials and merchandise,  materials,  parts, supplies, work in
process, inventories and finished products intended for sale by Debtor including
inventory temporarily removed from said premises and items in transit;

              (c)  all  contract  rights  and  general  intangibles  of  Debtor,
including without limitation,  goodwill,  trademarks, trade styles, trade names,
patents,  patent  applications,  copyrights,  bank deposits,  deposit  accounts,
income tax refunds and property in the  possession,  deposited with or under the
control of Secured Party or any of its affiliates;

              (d) all present and future accounts, accounts receivable and other
receivables and all books and records relating thereto;

              (e)  all  documents,  instruments,  investment  property,  pledged
assets


<PAGE>

and chattel paper; and

              (f)  all the  products  and  proceeds  of the  foregoing,  and any
replacements,   additions,  accessions,  or  substitutions  thereof,  all  after
acquired property, all accounts or proceeds arising from the sale or disposition
of any inventory of Debtor  including any returns  thereof and including,  where
applicable, the proceeds of insurance covering said Collateral or tort claims in
connection with the Collateral;

whether such  Collateral  shall be presently in existence or whether it shall be
acquired or created by Debtor at any time hereafter, wherever located, to remain
in force so long as Debtor is, in any manner, obligated to Secured Party.

         3.  Liabilities.  The  liabilities  ("Liabilities")  secured under this
Security  Agreement are all  liabilities of Debtor to Secured Party from time to
time, including,  without limitation,  the "Liabilities" under and as defined in
that  certain  Secured  Continuing  Corporate  Guaranty  dated  the date  hereof
("Guaranty")  made by Debtor  in favor of  Secured  Party  with  respect  to the
obligations  of Northern  Geophysical of America,  Inc., a Delaware  corporation
("Borrower"),  Debtor's affiliate, to Secured Party, arising under or related to
that certain Loan and Security  Agreement dated the date hereof between Borrower
and Secured Party ("Loan Agreement").

         4. Covenants of Debtor.  Until the Liabilities are paid in full, Debtor
agrees that it shall,  except to the extent otherwise  specifically  provided to
the contrary in the Loan Agreement:

              (a) not sell or otherwise dispose of the Collateral except for the
sale of inventory in the ordinary course of business;

              (b) not  create,  incur,  assume or  permit  to exist  any  liens,
encumbrances, security interests, levies, assessments or charges on or in any of
the Collateral, without Secured Party's consent;

              (c) appear in and defend,  at Debtor's own expense,  any action or
proceeding which may affect Debtor's title to or Secured Party's interest in the
Collateral;

              (d) procure or execute and deliver, from time to time, in form and
substance   satisfactory  to  Secured  Party,  any  endorsements,   assignments,
financing  statements  or other  writings  deemed  necessary or  appropriate  by
Secured Party to perfect,  maintain or protect Secured Party's security interest
in the  Collateral  and the  priority  thereof,  and take such other  action and
deliver such other  documents,  instruments  and  agreements  pertaining  to the
Collateral  as  Secured  Party may  request  to  effectuate  the  intent of this
Security Agreement;

              (e) notify  Secured  Party in writing  at least  thirty  (30) days
prior to


                                      - 2 -

<PAGE>

any change in Debtor's name, identity or corporate structure, or any addition or
change to the address of Debtor specified in the introductory paragraph hereof;

              (f) keep separate, accurate and complete records of the Collateral
and provide  Secured Party during normal  business hours with access thereto and
to  Debtor's  financial  records,  in each case with the right to make  extracts
therefrom;

              (g) provide Secured Party during normal business hours with access
to the  Collateral,  and with  such  other  information  as  Secured  Party  may
reasonably request from time to time;

              (h) maintain and preserve its corporate existence, and all rights,
privileges,  franchises  and other  authority  necessary  for the conduct of its
business;

              (i) continue operations in the same form and structure of business
as  currently  conducted,  and not merge or  consolidate  with or  acquire or be
acquired  by any  other  corporation,  partnership,  entity or  person,  without
Secured Party's prior written consent; and

              (j) comply with each of the covenants and  agreements set forth in
Sections  5, 6, 7, 8 and 10 of the  Loan  Agreement  as if such  covenants  were
applicable to Debtor and fully set forth herein.

         5. Authorized  Action By Secured Party. (a) After the occurrence of any
"Event of Default" (as defined below) and while it is continuing,  Debtor hereby
irrevocably  appoints Secured Party as its  attorney-in-fact  to do (but Secured
Party shall not be obligated  to and shall not incur any  liability to Debtor or
any third party for failure so to do) any act which  Debtor is obligated by this
Security Agreement to do, and to exercise such rights and powers as Debtor might
exercise with respect to the  Collateral,  including,  without  limitation,  the
right to:

                  (i) collect by legal  proceedings  or  otherwise  and endorse,
         receive  and  receipt  for all  payments,  proceeds  and other sums and
         property now or hereafter payable on or on account of the Collateral;

                  (ii) enter  into any  extension,  deposit  or other  agreement
         pertaining  to, or  deposit,  surrender,  accept,  hold or apply  other
         property in exchange for, the Collateral;

                  (iii) process and preserve the Collateral; and

                  (iv) make any compromise,  settlement or adjustment,  and take
         any action it deems advisable, with respect to the Collateral.

              (b) Debtor agrees to reimburse Secured Party upon demand for any


                                      - 3 -

<PAGE>

costs and expenses,  including  attorneys'  fees,  Secured Party may incur while
acting as Debtor's  attorney-in-fact  hereunder, all of which costs and expenses
are included in the Liabilities secured hereby and are payable upon demand, with
interest  thereon at the interest rate then  applicable to revolving loans under
the Loan Agreement.

              (c) It is further agreed and understood between the parties hereto
that such care as Secured Party gives to the  safekeeping of its own property of
like kind shall  constitute  reasonable  care of the Collateral  when in Secured
Party's possession;  provided, however, that Secured Party shall not be required
to make any presentment, demand or protest, or give any notice and need not take
any action to preserve any rights against any prior party or any other person in
connection with the Liabilities or with respect to the Collateral.

              (d)  Whether  or not  Debtor is in  default,  Debtor  agrees  that
Secured  Party may at any time  send  verification  requests,  and so long as an
Event of Default has not occurred, such requests will not identify Secured Party
to any account debtor on any Collateral.

              (e) If  Debtor's  records  are  prepared or retained by a computer
service  company  or any  accountant  or  accounting  service,  so  long  as any
Liabilities  are  outstanding,  Debtor  grants  Secured  Party the  absolute and
irrevocable  right,  with reasonable  notice to Debtor,  to inspect such records
(including  Debtor's  internal work  papers),  receive  duplicate  copies of all
information  furnished to Debtor and  prepared by such  company,  accountant  or
accounting  service,  and agrees to furnish such consents as may be necessary to
effectuate the same.  Debtor further agrees to promptly  notify Secured Party of
the name and address of such company,  accountant  or accounting  service and of
any change in respect thereof.

              (f) All the foregoing powers authorized herein, being coupled with
an interest, are irrevocable so long as any Liabilities are outstanding.

         6. Default. The occurrence of any of the following events or conditions
(herein "Events of Default") shall constitute an Event of Default hereunder:

              (a)  breach,  violation  or  nonperformance  of  any  covenant  on
Debtor's part hereunder or under the Guaranty;

              (b)  non-payment  of any of the  Liabilities  as and  when due and
payable to Secured Party; or

              (c)  any  Event  of  Default  under  and as  defined  in the  Loan
Agreement.

         7. Remedies. Upon the occurrence and during the continuation of any


                                      - 4 -

<PAGE>

Event of Default,  Secured Party may, at its option, without notice to or demand
on Debtor,  declare all  Liabilities  immediately  due and payable,  and Secured
Party shall have all the default  rights and  remedies of a secured  party under
the Uniform  Commercial  Code as in effect in the State of California  and other
applicable law as well as the following rights and remedies, all of which may be
exercised with or without further notice to Debtor:

              (a) to the extent permitted by law, to notify any and all obligors
and account debtors on the Collateral that the same has been assigned to Secured
Party and that all payments thereon are to be made directly to Secured Party;

              (b) to settle,  compromise  or  release,  on terms  acceptable  to
Secured Party, in whole or in part, any amounts owing on the Collateral,  and to
extend the time of payment, make allowances and adjustments and to issue credits
in Secured Party's name or in the name of Debtor in respect thereof;

              (c) to enter any premises  where any Collateral may be located and
to take  possession  of and remove  the  Collateral,  with or  without  judicial
process;

              (d) to sell or  otherwise  dispose of the  Collateral  or any part
thereof,  for cash, on credit or otherwise,  with or without  representations or
warranties, and upon such terms as shall be acceptable to Secured Party;

              (e) to remove from any premises where the same may be located, any
and all documents,  instruments,  files and records  relating to the collateral,
and Secured Party may, at Debtor's expense, use the supplies and space of Debtor
at its places of business as may be necessary to properly administer and control
the Collateral or the handling of collections and realizations thereon;

              (f) receive,  open and dispose of all mail addressed to Debtor and
notify  postal  authorities  to change the address for delivery  thereof to such
address as Secured Party may designate; and

              (g)  take or  bring,  in  Secured  Party's  name or in the name of
Debtor,  all  steps,  actions,  suits or  proceedings  deemed by  Secured  Party
necessary  or  desirable  to  effect  collection  of  or  to  realize  upon  the
Collateral,

all at Secured  Party's sole option and as Secured Party in its sole  discretion
may deem advisable.

         8.  Application  of  Proceeds  of  Collateral.  The net  cash  proceeds
resulting from the  collection,  liquidation,  sale or other  disposition of the
Collateral  shall be applied  first to the expenses  (including  all  attorneys'
fees)  of  retaking,  holding,  processing  and  preparing  for  sale,  selling,
collecting,  liquidating  and the  like,  and  then to the  satisfaction  of all
Liabilities  secured  hereby,  application  as to any  particular  obligation or
indebtedness or


                                      - 5 -

<PAGE>

against principal or interest to be in Secured Party's discretion.  Debtor shall
be  liable  to  Secured  Party and  shall  pay to  Secured  Party on demand  any
deficiency  which  may  remain  after  such  sale,  disposition,  collection  or
liquidation of Collateral.

         9. Cumulative Rights. The rights,  powers and remedies of Secured Party
under this  Security  Agreement  shall be in addition to all rights,  powers and
remedies  given to Secured  Party  under any statute or rule of law or any other
document,  instrument  or agreement,  all of which  rights,  powers and remedies
shall be cumulative and may be exercised successively or concurrently.

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

         11. Setoff. Debtor agrees that Secured Party may exercise its rights of
setoff with respect to the  Liabilities in the same manner as if the Liabilities
were unsecured.

         12.  Binding Upon  Successors.  All rights of Secured  Party under this
Security Agreement shall inure to the benefit of its successors and assigns, and
all   obligations   of  Debtor  shall  bind  the   representatives,   executors,
administrators, heirs, successors and assigns of the Debtor.

         13. Entire Agreement;  Severability.  This Security  Agreement contains
the entire security  agreement  between Secured Party and Debtor with respect to
the  Collateral.  If any of the provisions of this Security  Agreement  shall be
held invalid or unenforceable,  this Security Agreement shall be construed as if
not containing  those  provisions and the rights and  obligations of the parties
hereto shall be construed and enforced accordingly.

         14.  References.  The  captions  or  titles of the  paragraphs  of this
Security Agreement are for convenience of reference only and shall not define or
limit the provisions hereof.

         15.  Governing Law;  Waivers.  This  Agreement  shall be interpreted in
accordance  with the  internal  laws (and not the conflict of laws rules) of the
State of California  governing  contracts to be performed  entirely  within such
state.  Debtor  hereby  consents to the exclusive  jurisdiction  of any state or
federal  court  located  within  the  County  of Los  Angeles  in the  State  of
California or, at the sole option of Secured Party,  in any other court in which
Secured  Party  shall  initiate  legal or  equitable  proceedings  and which has
subject matter  jurisdiction  over the matter in controversy.  Debtor waives any
objection of forum non  conveniens and venue.  Debtor  further  waives  personal
service of any and all


                                      - 6 -

<PAGE>

process  upon it, and  consents  that all such service of process be made in the
manner set forth in Section 17 hereof for the giving of notice.  BOTH DEBTOR AND
SECURED PARTY WAIVE ANY RIGHT TO TRIAL BY JURY TO THE EXTENT PERMITTED BY LAW.

         16.  Attorneys'  Fees.  If any  legal  action  or  proceeding  shall be
commenced  at any time by any party to this  Agreement  in  connection  with the
interpretation  of this  Agreement or the  enforcement of any rights or remedies
hereunder, the prevailing party or parties in such action or proceeding shall be
entitled  to  reimbursement  of its  reasonable  attorneys'  fees  and  costs in
connection  therewith,  in addition to all other relief to which the  prevailing
party or parties may be entitled.

         17. Notice. Any written notice, consent or other communication provided
for in this Security  Agreement  shall be delivered  personally  (effective upon
delivery),  via overnight courier (effective the next day after dispatch) or via
U.S. Mail (effective 3 days after mailing, postage prepaid, first class) to each
party at its address set forth above,  or to such other  address as either party
shall specify to the other; provided, that all notices to Secured Party shall be
copied to any assignee of Secured Party's rights hereunder.

         18. Counterparts. This Security Agreement may be executed in any number
of  counterparts,  and by the parties hereto in separate  counterparts,  each of
which when so executed and delivered  shall be deemed an original,  but all such
counterparts together shall constitute but one and the same instrument.


SECURED PARTY:                                        DEBTOR:

SANWA BUSINESS CREDIT                                 3-D GEOPHYSICAL, INC.
CORPORATION

By:  /s/ Timothy K. Turner                           By:  /s/ Ronald L. Koons
     ---------------------                                -------------------
Its:  First Vice President                           Its:  Vice President


                                      - 7 -


                               SECURITY AGREEMENT

THIS SECURITY AGREEMENT dated for reference November 7,1997.
                                    SECTION 1
                                SECURITY INTEREST

1.1      Creation of Security Interest.

         J.R.S.  EXPLORATION  COMPANY LIMITED (the  "DEBTOR"),  having its chief
executive  office  at 4750 30  Street,  S.E.,  Calgary,  Alberta,  T2B  2Z1  as
continuing security for the repayment and the performance of the Obligations (as
defined herein) of the Debtor to SANWA BUSINESS CREDIT CORPORATION (the "SECURED
PARTY")  having an office at Suite 950,  550 North  Brand  Boulevard,  Glendale,
California, U.S.A. 91203, grants to the Secured Party a continuing, specific and
fixed assignment, transfer, mortgage, charge and security interest in all of the
Debtor's  property,  assets,  rights and  undertaking of every nature,  item and
kind,  now or at any time and from  time to time,  wherever  situate,  including
those described in this clause 1.1, namely:

i)       ACCESSIONS. All increases, additions, accretions and accessions to, and
         all extensions,  reversions,  renewals, continuations or replacement of
         any of the  Collateral (as defined in Section 2. 1)  (collectively  the
         "ACCESSIONS");

ii)      ACCOUNTS.  All debts,  accounts,  claims and monies  which now are,  or
         which  may at any time  hereafter  be,  due or owing to or owned by the
         Debtor OR in which the Debtor now or hereafter has any other  interest,
         and also all securities,  bills,  notes and other documents now held or
         owned or which may be hereafter  taken,  held or owned by the Debtor or
         anyone on behalf of the Debtor in respect of the said debts,  accounts,
         claims and monies, and any part thereof (collectively, the "ACCOUNTS");

iii)     Chattel  Paper.  All chattel paper in which the Debtor now or hereafter
         has an interest, and any part thereof (the "CHATTEL PAPER");

iv)      DOCUMENTS OF TITLE.  All  documents  of title,  whether  negotiable  or
         nonnegotiable,  including,  without limitation,  all warehouse receipts
         and  bills of  lading,  in which the  Debtor  now or  hereafter  has an
         interest,  and  any  part  thereof  (collectively,  the  "DOCUMENTS  OF
         TITLE");

v)       EQUIPMENT.  All  goods in which  the  Debtor  now or  hereafter  has an
         interest  other than  Inventory or consumer goods and any part thereof,
         including,  without limitation, all tools, apparatus,  fixtures, plant,
         machinery, furniture, chattels, vehicles, vessels, air


<PAGE>

         conditioning,  heating, ventilating,  electrical, mechanical, plumbing,
         communications  and  data  systems,  elevators,  escalators  and  other
         conveyancing  devices,  boilers,  furnaces,   carpets,  blinds,  window
         coverings,   curtains,  awnings,  lighting  fixtures,  doors,  windows,
         demising  walls  and  partitions,  wiring,  pipes,  conduits,  seasonal
         decorations,  and the equipment described in the Schedule hereto or any
         schedule hereafter annexed hereto (collectively, the "EQUIPMENT');

vi)      INSTRUMENTS.  All  letters of  credit,  advices of credit and all other
         instruments  in which the Debtor now or hereafter has an interest,  and
         any part thereof (collectively, the "INSTRUMENTS");

vii)     INTANGIBLES.  All  intangible  property of  whatever  kind in which the
         Debtor now or hereafter has an interest, including, without limitation,
         all of the Debtor's choses in action,  contractual rights,  agreements,
         leases  of  personal  property,  license  rights,  licenses,   permits,
         goodwill,   patents,  trade  marks,  trade  names,  quotas,  industrial
         designs,  copyrights  and other  industrial  or  intellectual  property
         (collectively, the "INTANGIBLES");

viii)    INVENTORY.   All  personal  property  of  whatever  kind  and  wherever
         situated,  which now or  hereafter  forms part of the  inventory of the
         Debtor, in which the Debtor now or hereafter has an interest, including
         without limitation,  all goods,  merchandise,  raw materials,  goods in
         process,  work in progress,  finished goods and other tangible personal
         property now or hereafter held for sale,  lease,  resale or exchange or
         furnished or to be furnished  under  contracts  for service or that are
         used or consumed in the  business of the Debtor,  and any part  thereof
         (collectively, the "INVENTORY");

ix)      MONEY.  All money in which the Debtor now or hereafter has an interest,
         and any part thereof (the "Money");

x)       PROCEEDS.  All  proceeds  and  personal  property  in any form  derived
         directly or indirectly from any dealing with the Collateral or any part
         thereof   and  all   proceeds  of   proceeds   and  any  part   thereof
         (collectively, the "PROCEEDS");

xi)      RECORDS. All books, papers,  documents,  writings,  tapes,  magnetic or
         other  machine  readable data and records,  and all other  information,
         however  stored,  recording  or  relating  to  any  of  the  Collateral
         (collectively, the "RECORDS"); and

xii)     SECURITIES.  All shares, stock, warrants, bonds, debentures,  debenture
         stock, mortgages and other


                                      - 2 -


<PAGE>

         securities  in which the Debtor now or hereafter  has an interest,  and
         any part thereof (collectively, the "SECURITIES').

1.2      Floating Charge.

         As  security  for  the  repayment  and the  performance  of each of the
Obligations  (as defined  herein),  the Debtor  grants a floating  charge to the
Secured Party on all the Debtor's  interest in real property,  including without
limitation, all fixtures, crops and improvements, both present and future, other
than such as are validly and effectively, charged under Section 1.1 or

1.3      Nature of Security Interests.

         Notwithstanding  the Debtor's  right to deal with the  Inventory in the
ordinary course of business as provided  herein,  the security  interest created
hereby shall  operate as fixed and specific  mortgages and charges of all of the
Collateral presently existing, and with respect to all future Collateral,  shall
operate as fixed and specific  mortgages  and charges of such future  Collateral
which  shall  attach at the  moment the Debtor  acquires  any right or  interest
therein.  The security interest created by Section 1.2 is intended as a floating
charge which shall attach at the time provided in Section 1.4.

1.4      Attachment.

         The  Debtor  acknowledges  that  value  has been  given.  The  security
interests  created hereby are intended to attach, as to all of the Collateral in
which the Debtor  has an  interest,  forthwith  when the  Debtor  executes  this
Security  Agreement,  and, as to all Collateral in which the Debtor acquires any
right or interest  after the  execution  of this  Security  Agreement,  when the
Debtor acquires such right or interest.

1.5      Exceptions.

         Leases - The last day of any term  reserved  by any  lease,  verbal  or
written, or any agreement therefor, now held or hereafter acquired by the Debtor
is hereby  excepted out of the security  interests  created  hereby.  The Debtor
shall assign and dispose of such last day of any term reserved by any such lease
in such  manner as the  Secured  Party may from time to time  direct in writing.
Upon any  sale,  assignment  sublease  or  other  disposition  of such  lease or
agreement  to lease,  the Secured  Party  shall,  for the purpose of vesting the
aforesaid residue of any such term in any purchaser, assignee, sublessee or such
other  acquire of the lease,  agreement  to lease or any  interest  therein,  be
entitled by deed or other written instrument to assign to such other person, the
aforesaid  residue of any such other in lease of the Debtor and to vest the same
freed and discharged from any obligation whatsoever respecting the same.


                                      - 3 -


<PAGE>

1.6      Statement.

         The Debtor acknowledges that a security interest is taken in all of the
Debtor's present and after acquired property.

1.7      Where Consent Required.

         Nothing herein shall  constitute an assignment or attempted  assignment
of any right,  privilege,  benefit contact  permit,  policy or other document or
instrument which by the provisions  thereof or by law is not assignable or which
requires  the  consent  of any  third  party to its  assignment  unless  such is
obtained or is waived by the third  party.  In each such case the Debtor  shall,
unless the  Secured  Party  otherwise  agrees in writing,  forthwith  obtain the
consent  of any  necessary  third  party to its  assignment  hereby  and for its
further  assignment by the Secured party to any third party who may acquire same
as a result  of the  Secured  party's  exercise  or  remedies  after an Event of
Default.  Upon such consents being obtained or waived,  this Security  Agreement
shall apply thereto without regard to this Section 1.7 and without the necessity
of any further assurance to effect the assignment thereof

1.8      Pending Consent.

         In any case to which  Section 1.7 applies,  unless and until consent to
assignment is obtained as therein  provided,  the Debtor shall, to the extent it
may do so by law or  pursuant  to the  provisions  of the  document  or interest
therein  referred to, hold all benefit to be derived  therefrom in trust for the
Secured Party as additional  security for  performance  of the  Obligations  and
shall deliver up all such benefit to the Secured Party  forthwith upon demand by
the Secured Party.

                                    SECTION 2
                                   DEFINITIONS

2.1      Collateral.

         The  property,   assets,  rights  and  undertaking  charged  hereunder,
including all of such Accessions,  Accounts,  Chattel Paper, Documents of Title,
Equipment,  Instruments,  Intangibles,  Inventory,  Money, Proceeds, Records and
Securities together with all increases,  additions,  improvements and accessions
thereto, and all substitutions or any replacements thereof are, unless otherwise
specified, herein referred to as the "COLLATERAL".

2.2      Defined Terms.

         Unless the context  otherwise  requires or unless otherwise  specified,
all the terms used  herein  without  initial  capitals  which are defined in the
Personal Property Security Act (Alberta) or the regulations thereunder,  as they
may be amended, restated or replaced by successor legislation of comparable


                                      - 4 -


<PAGE>

effect (collectively, the "PISA), have the same meaning herein as in the PISA.

2.3      General Terms.

i)       "AGREEMENT"  means any contract,  instrument,  permit,  policy or other
         document forming part of the Collateral,  or creating or evidencing any
         right, privilege or benefit forming part of the Collateral;

ii)      "BUSINESS  PREMISES"  means real property  which the Debtor uses in its
         business, if any;

iii)     "ENVIRONMENTAL  LAWS"  means any laws,  regulations,  orders,  by-laws,
         permits  or lawful  requirements  of any  governmental  authority  with
         respect to environmental  protection or regulating hazardous materials;
         and

iv)      "HAZARDOUS  MATERIALS" means any asbestos material,  urea formaldehyde,
         explosives, radioactive materials, pollutants,  contaminants, hazardous
         substances,  corrosive substances,  toxic substances,  special waste or
         waste of any kind  including,  without  limitation,  compounds known as
         chlorobiphenyls and any substance the storage,  manufacture,  disposal,
         treatment,  generation, use, transport, remediation or release of which
         into the  environment  is  prohibited,  controlled  or  licensed  under
         Environmental Laws.

                                    SECTION 3
                               OBLIGATIONS SECURED

3.1      Obligations Secured.

         The Collateral  constitutes and will constitute continuing security for
the following obligations (collectively, the "OBLIGATIONS') of the Debtor to the
Secured Party:

i)       INDEBTEDNESS.  The prompt payment,  as and when due and payable, of all
         amounts  now or  hereafter  owing by the Debtor to the  Secured  Party,
         including  by way of guarantee  or  indemnity,  whether now existing or
         hereafter incurred,  matured or unmatured,  direct,  indirect, joint or
         several,  or contingent  including any extensions and renewals thereof,
         and all future advances and re-advances; and

ii)      PERFORMANCE OF AGREEMENTS. The strict performance and observance by the
         Debtor of all agreements,  warranties,  representations,  covenants and
         conditions of the Debtor made  pursuant to this  Security  Agreement or
         any other agreement between the Debtor and the Secured Party all as now
         in effect or as hereafter entered into or amended.


                                      - 5 -


<PAGE>

3.2      Reduction of Obligations.

         The  Obligations  may be  reduced  to zero  from  time to time  without
affecting the validity,  perfection or enforceability of this Security Agreement
or the  security  interests  created  hereby  until this  Security  Agreement is
discharged in accordance with Section 9. 1 0.

                                    SECTION 4
                     DEBTOR'S REPRESENTATIONS AND WARRANTIES

4.1      General

         The  Debtor  represents  and  warrants  to and for the  benefit  of the
Secured Party and so long as this  Security  Agreement in effect shall be deemed
to continuously represent and warrant as set out in this Section 4.

4.2      Incorporation, Licenses and Qualifications.

         The Debtor is a body corporate,  duly incorporated,  properly organized
and  validly  existing  under the laws of  Alberta  and is duly  recognized  and
qualified to do business under the laws of each other  jurisdiction in which the
character  of the  properties  owned  by it or  the  nature  of  the  activities
conducted b it make such registration or qualification advisable or necessary.

4.3      Corporate Power.

         The Debtor has full power and lawful  authority to enter this  Security
Agreement and to grant the security interests hereby created.

4.4      Enforceability.

         This  Security  Agreement  constitutes  a  valid  and  legally  binding
obligation of the Debtor  enforceable  against the Debtor in accordance with its
terms,  subject only to  bankruptcy,  insolvency  or other  statutes or judicial
decisions  affecting  the  enforcement  of  creditors'  rights  generally and to
general principles of equity.

4.5      No Actions or Material Adverse Changes.

         There is no action or  proceeding  pending or to the  knowledge  of the
Debtor threatened  against the Debtor before any court,  administrative  agency,
tribunal, arbitrator, government or governmental agency or any fact known to the
Debtor and not  disclosed to the Secured  Party which might involve any material
adverse  change in the  properties,  business,  prospects  or  condition  of the
Debtor,  or which question the validity of this Security  Agreement or any other
material  agreement to which the Debtor is a party (or the  Debtor's  ability to
perform its


                                      - 6 -


<PAGE>

obligations  under  this  Security  Agreement)  and  there  are  no  outstanding
judgments, writs of execution, work orders, injunctions,  directives against the
Debtor or its properties.

4.6      Non-Conflict.

         Neither the execution nor the  performance  of this Security  Agreement
requires the approval of any  regulatory  agency  having  jurisdiction  over the
Debtor nor is this Security  Agreement in  contravention  of or in conflict with
the articles,  by-laws or  resolutions of the directors or  shareholders  of the
Debtor or of the  provisions  of any agreement to which the Debtor is a party or
by which any of its property may be bound or of any statute, regulation, by-law,
ordinance or other law, or of any judgment,  decree,  award,  ruling or order to
which the Debtor or any of its property may be subject.

4.7      No Default.

         The Debtor is not in breach of any agreement to which it is a party.

4.8      Ownership and Collateral Free of Encumbrances.

         The  Debtor is the owner of or has  rights in the  Collateral  free and
clear of all other security interests,  mortgages,  hypothecs,  pledges,  liens,
claims,  charges,  whether fixed or floating,  or other encumbrances  whatsoever
(collectively the "ENCUMBRANCES").

4.9      No Other Corporate Names or Styles.

         The  Debtor  does not now  carry on  business  under or use any name or
style other than the name(s) specified in this Security Agreement.

4.10     Places of Business of the Debtor.

         The place of  business  of the Debtor or the chief place of business if
there are more than one places of business is at 4750 30 Street,  S.E., Calgary,
Alberta,  T2B 2Z1 (the  "PLACE OF  BUSINESS")  where  the  Debtor  conducts  its
business  operations  or keeps or stores the  Collateral  and records in respect
thereof and of the Debtor's business.

4.11     Serial Numbered Goods.

         The complete,  accurate and appropriate  serial number (as specified in
the  regulations  under  the PPSA)  for each  item of  Equipment  that is serial
numbered  goods in which  the  Debtor  now has any  interest,  is set out in the
Schedule hereto.

4.12     Insurance.


                                      - 7 -


<PAGE>

         The Collateral is insured in accordance with the terms hereof.

4.13     Account Debtor.

         Each  Account,  Chattel  Paper,  Security and  Instrument  constituting
Collateral is genuine and  enforceable in accordance  with its terms against the
party obligated to pay thereunder (the "Account Debtor").

4.14     Amounts Due From Account Debtor.

         The amount  represented by the Debtor to the Secured Party from time to
time as owing by each Account  Debtor or by all Account  Debtors  shall,  to the
best  of  the   Debtor's   knowledge   be  the  correct   amount   actually  and
unconditionally owing by such Account Debtor or Account Debtors, save and except
for normal cash discounts where applicable.

4.15     Financial Information.

         In all information and financial statements supplied for the benefit of
the Secured Party, the Debtor has made no untrue statement of any material fact,
and has  revealed  all  material  facts the  omission  of which  would make such
information and statements misleading.  The Debtor has disclosed all facts which
materially  adversely  affect or, so far as the Debtor can  reasonably  foresee,
will  materially  adversely  affect  the  business,  properties,   prospects  or
financial  condition  of the Debtor or the  ability of the Debtor to perform its
obligations  hereunder.  All  accounting  information  and financial  statements
supplied for the benefit of the Secured  Party have been  prepared in accordance
with generally accepted accounting principles.

4.16     Survival and Reliance.

         All  representations and warranties of the Debtor made herein or in any
certificate  or other  document  delivered by or on behalf of the Debtor for the
benefit of the Secured  party are  material,  shall  survive the  execution  and
delivery of this Security  Agreement and shall continue in full force and effect
without  time limit.  The Secured  Party is deemed to have relied upon each such
representation  and warranty  notwithstanding  any  investigation  made by or on
behalf of the Secured Party at any time.

                                    SECTION 5
                               DEBTOR'S COVENANTS

5.1      General.

         Unless compliance with the following covenants is waived by the Secured
Party in writing or unless  non-compliance  with any such covenants is otherwise
consented to by the Secured


                                      - 8 -


<PAGE>

Party by written agreement with the Debtor, the Debtor covenants and agrees with
the Secured  Party to observe and perform each of the  covenants set out in this
Section 5.

5.2      Keep Collateral in Good Repair.

         The  Debtor  will keep the  Collateral  in good  order,  condition  and
repair.

5.3      Conduct of Business.

                  The Debtor will carry on and conduct its  business in a proper
and efficient manner so as to protect and preserve the Collateral.

5.4      Servicing of Payables.

         The Debtor will pay when due all  amounts  are payable by it  howsoever
arising,  including without limiting the generality of.the foregoing, all rents,
charges,  taxes,  rates,  levies,  assessments,  fees and duties of every nature
which may be levied, assessed or imposed against or in respect of the Collateral
or Debtor and will provide the Secured  Party with evidence of such payment upon
request.

5.5      Compliance with Agreements and Laws.

         The Debtor will not use the  Collateral  in violation of this  Security
Agreement  or any other  agreement  relating  to the  Collateral  or any  policy
insuring  the  Collateral  or  any  applicable  statute,   law,  by-law,   rule,
regulation, court order or ordinance.

5.6      Notice of Encumbrances and Proceedings.

         The Debtor will promptly  notify the Secured  Party of any  Encumbrance
made or  asserted  against  any of the  Collateral,  and of any suit,  action or
proceeding affecting any of the Collateral or which could affect the Debtor. The
Debtor will, at its own expense,  defend the Collateral against any and all such
Encumbrances and aging any and all such suits, actions or proceedings.

5.7      No Accessions or Fixtures.

         The Debtor will prevent the  Collateral  from  becoming an accession to
any property  other than the  Collateral or from  becoming a fixture  unless the
security  interests  hereby  created  rank prior to the  interests  of all other
persons in the realty.

5.8      Marking the Collateral.

         The  Debtor  will,  at the  request  of the  Secured  Party,  mark,  or
otherwise take appropriate steps to identify, the


                                      - 9 -


<PAGE>

Collateral  to indicate  clearly  that it is subject to the  security  interests
hereby created.

5.9      Disposition of Collateral.

         The  Debtor  will not  assign,  transfer,  sell,  lease,  exchange,  or
otherwise dispose of the Collateral or any interest therein except for:

i)       Inventory in the ordinary  course of business on customary trade terms;
         and

ii)      Equipment  which has become worn out,  damaged or otherwise  unsuitable
         for its  purpose,  on  condition  that the Debtor  substitute  for such
         Equipment property of equal value free from all Encumbrances, except in
         favour of the Secured  Party.  Such  substituted  property shall become
         part of the  Collateral as soon as the Debtor  acquires any interest in
         it.

5.10     Encumbrances.

         Except for the  Permitted  Encumbrances,  the Debtor  will not  create,
assume or suffer to exist any Encumbrance in, of or on any of the Collateral.

5.11     Change of Place of Business, Collateral and Names.

         The  Debtor  will not  change its Place of  Business,  chief  executive
office, the location of any of the Collateral, or the records in respect thereof
or change  its name or any name or style  under  which it  carries  on  business
without  giving to the Secured Party 20 day's prior written  notice of me change
or of the new name or style, as applicable.

5.12     Serial Numbered Goods.

         The Debtor will, at or before the time that it acquires any interest in
any item of Equipment that is serial  numbered  goods,  give the Secured Party a
written notice setting out the complete,  accurate and appropriate serial number
(as specified in the regulations under the PPSA) of such item of Equipment.

5.13     Notice of Loss of Collateral.

i)       all loss or damage to or loss or possession of the Collateral otherwise
         than by disposition in accordance with the terms hereof; and

ii)      any  failure  of any  Account  Debtor  in  payment  or  performance  of
         obligations due to the Debtor which may affect the Collateral.

5.14     Inspection of Records and Collateral.


                                     - 10 -

<PAGE>

         The Debtor will at all times keep accurate and complete  records of the
Collateral as well as proper books of account for its business all in accordance
with generally accepted accounting principles,  consistently applied. The Debtor
will permit the  Secured  Party or its  authorized  agents to have access to all
premises  occupied by the Debtor or any place where the  Collateral may be found
to inspect  the  Collateral  and to  examine  the books of  accounts,  financial
records and reports of the Debtor and to have temporary  custody of, make copies
of and take extracts from such books, records and reports.

5.15     Access to Computer Information.

         In the event that the use of a computer  system is  required  to access
any  information  and data which the  Secured  Party is  entitled  to access and
examine  hereunder,  the  Debtor  will  allow the  Secured  Party the use of its
computer system for such purpose and will provide  assistance in that regard. If
for any reason  such  information  and data  cannot be  accessed  and  retrieved
Debtor's  premises  the  Secured  Party may  remove  the  medium  in which  such
information  or data is stored  from the  Debtor's  premises  to any other place
which has a computer  system that will give the Secured Party the opportunity to
retrieve,  record or copy such information and data. The Secured Party is hereby
authorized  to reproduce and retain a copy of any such  information  and data in
any format whatsoever.

5.16     Delivery of Documents.

         The Debtor will promptly deliver to the Secured Party upon request:

i)       DOCUMENTS OF TITLE.  Any Chattel Paper,  Instruments,  Securities,  and
         Documents of Title,  and upon such  delivery,  where  applicable,  duly
         endorse  the same for  transfer  in blank or as the  Secured  Party may
         direct;

ii)      BOOKS OF ACCOUNT. All computer software, tapes, discs, drums and cards,
         all books of account and all records, ledgers, reports, correspondence,
         schedules, documents,  statements, lists and other writings relating to
         the Collateral or the Debtor's  business for the purpose of inspecting,
         auditing or copying the same;

iii)     FINANCIAL  STATEMENTS.  All financial statements prepared by or for the
         Debtor regarding the Debtor's business;

iv)      POLICIES OF  INSURANCE.  All  policies  and  certificates  of insurance
         relating to the Collateral;

v)       AGREEMENTS.  All  agreements,  licenses,  and consents  relating to the
         Collateral and the Debtor's business; and


                                     - 11 -


<PAGE>

vi)      OTHER  INFORMATION.  Such  information  concerning the Collateral,  the
         Debtor and the Debtor's  business and affairs as the Secured  Party may
         request.

5.17     Risk and Insurance.

         The Debtor will bear the sole risk of any loss, damage,  destruction or
confiscation of or to the Collateral during the Debtor's  possession  thereof or
otherwise. The Debtor will insure the Collateral with insurers acceptable to the
Secured Party against loss or damage by fire,  theft or other  insurable  perils
customarily insured against by persons having an interest in such Collateral for
the full  insurable  value thereof with the Secured Party as a named insured and
with loss  payable to the Secured  Party as its  interest  may appear.  All such
policies  of  insurance  shall  provide  that the  insurance  coverage  provided
thereunder  shall not be changed or cancelled  except on 30 days' prior  written
notice to the Secured Party. If the Debtor shall fail to so insure,  the Secured
Party may, but shall not be required to, insure the  Collateral and the premiums
for such insurance shall be added to the Obligations and be secured hereby.

5.18     Proceeds In Trust.

         The  Debtor  will and shall be deemed  to hold all  Proceeds  in trust,
separate and apart from other Money, Instruments or property, for the benefit of
the Secured  Party until all  amounts  owing by the Debtor to the Secured  Party
have been paid in full.

5.19     No Amalgamation.

         The Debtor will not change the nature of its business or  amalgamate or
otherwise merge with any person or permit all of or a substantial portion of its
property to become the property of any other person,  whether in one or a series
of  transactions,  and the  Debtor  shall  not do any act or  thing  that  would
materially  adversely  affect its  business,  property,  prospects  or financial
condition.

5.20     Dividends.

         The Debtor will not pay any dividends to the shareholders of any of the
classes  of  shares in die  capital  of the  Debtor,  and the  Debtor  shall not
purchase  or redeem any of the shares in the  capital of the Debtor  without the
prior  written  approval  of the  Secured  Party,  which  approval  will  not be
unreasonably withheld.

5.21     Performance and Default by Debtor.

         The Debtor will observe and perform all the obligations  imposed on the
Debtor by or in respect  of the  Collateral,  maintain  the  Collateral  in good
standing and not do or permit to


                                     - 12 -


<PAGE>

be done  anything to impair,  and not omit to do anything that would prevent the
impairment of, the security  interests  hereby created.  The Debtor will give to
the Secured Party prompt notice of any default by the Debtor in the  performance
of its covenants to the Secured Party under this Security Agreement.


5.22     Default under Agreements.

         The Debtor will not default under any provision of any Agreement or any
other  agreement which creates a security  interest in or otherwise  affects the
Collateral or, without the prior written consent of the Secured Party, amend any
Agreement or give any consent, concession or waiver of the terms of, or exercise
any option of the Debtor  permitted under such terms, or cancel or terminate any
Agreement  or accept the  surrender  thereof The Debtor will give to the Secured
Party  notice of any  default by the  Debtor  under any  Agreement  or any other
agreement  which  creates  a  security  interest  in or  otherwise  affects  the
Collateral,  promptly upon becoming aware of the occurrence of such default, but
in all events,  if the Debtor is aware of the  default,  in  sufficient  time to
afford the Secured  Party an  opportunity  to cure any such default prior to any
other  party  to any  Agreement  or any  such  other  agreement  terminating  or
otherwise  enforcing  its rights and remedies  under the Agreement or such other
agreement.

5.23     Environmental Law.

         The Debtor covenants and agrees with the Secured Party to:

i)       develop  and use the  Business  Premises  only in  compliance  with all
         Environmental Laws;

ii)      permit the Secured  Party to  investigate  the Business  Premises,  any
         goods on the Business Premises and the Debtor's records at any time and
         from time to time to verify such compliance with Environmental Laws and
         this Security Agreement;

iii)     upon the request of the Secured Party,  obtain from time to time at the
         Debtor's  cost a report from an  independent  consultant  designated or
         approved by the Secured Party verifying  compliance with  Environmental
         Laws and this  Security  Agreement or the extent of any  non-compliance
         therewith;

iv)      not store,  manufacture,  dispose,  treat,  generate,  use,  transport,
         remediate  or  release  Hazardous  Materials  on or from  the  Business
         Premises without notifying the Secured Party in writing;


                                     - 13 -


<PAGE>

v)       promptly remove any Hazardous Materials from the Business Premises in a
         manner which conforms to  Environmental  Laws governing  their removal;
         and,

vi)      notify the Secured Party in writing of:

         a)       any  enforcement,   clean-up,  removal,  litigation  or  other
                  governmental,  regulatory,  judicial or administrative  action
                  instituted,  contemplated or threatened  against the Debtor or
                  the Business Premises pursuant to any Environmental Laws;

         b)       all  claims,  actions,  orders  or  investigations,   made  or
                  threatened  by any  third  party  against  the  Debtor  or the
                  Business  Premises  relating  to  damage,  contribution,  cost
                  recovery,  compensation,  loss or injuries  resulting from any
                  Hazardous  Materials or any breach of the Environmental  Laws;
                  and

         c)       the discovery of any Hazardous  Materials or any occurrence or
                  condition  on  the  Business  Premises  or any  real  property
                  adjoining or in the vicinity of the  Business  Premises  which
                  could  subject  the  Debtor or the  Business  Premises  to any
                  fines,   penalties,    orders   or   proceedings   under   any
                  Environmental Laws.


                                    SECTION 6
                             COLLECTION OF ACCOUNTS

6.1      Collection of Accounts.

         The  Secured  Party may,  whether  before or after  default  under this
Security  Agreement,  notify and direct any Account  Debtor to make all payments
whatever to the Secured Party.  The Secured Party may hold all amounts  acquired
from any Account Debtor and any Proceeds as part of the Collateral.

6.2      Trust Provision.

         Any  payments   received  by  the  Debtor   whether   before  or  after
notification  to Account  Debtors,  shall be held by the Debtor in trust for the
Secured Party in the same medium in which received, shall not be commingled with
any assets of the Debtor and shall,  at the  request of the  Secured  Party,  be
turned over to the Secured  Party not later than the next business day following
the day of their receipt.

                                    SECTION 7
                                     DEFAULT

7.1      Default.


                                     - 14 -


<PAGE>

         The Debtor shall be in default under this Security  Agreement  upon the
occurrence of any of the following events ("EVENTS OF DEFAULT"):

i)       PERFORMANCE  OF  OBLIGATIONS.  The Debtor  defaults  in the  payment or
         performance of any of the Obligations;

ii)      BREACH OF AGREEMENT. The Debtor breaches any term, provision, warranty,
         representation  or covenant under this Security  Agreement or any other
         agreement between the Debtor and the Secured Party, all as in effect or
         as hereafter entered into or amended;

iii)     GUARANTOR  OR  INDEMNITOR  DEFAULT.  Any  person  who from time to time
         guarantees,  assumes or otherwise becomes liable for the Obligations or
         who  covenants  and agrees to indemnify the Secured Party for any loss,
         costs or damages  as a result of the  Debtor's  failure to perform  the
         Obligations (the "GUARANTOR/INDEMNITOR"), commits a breach of, or fails
         to observe or  perform,  any  covenant,  representation  or warranty in
         favour of the Secured Party;

iv)      CEASE TO CARRY ON BUSINESS. The Debtor or  Guarantor/Indemnitor  ceases
         or threatens to cease to carry on business;

v)       BANKRUPTCY,  INSOLVENCY.  The  dissolution,  termination  of existence,
         insolvency,   bankruptcy   or   business   failure  of  the  Debtor  or
         Guarantor/Indemnitor,   or  upon  the   appointment   of  a   receiver,
         receiver-manager or receiver and manager of any part of the property of
         the Debtor or  Guarantor/Indemnitor,  or the commencement by or against
         the  Debtor  or   Guarantor/Indemnitor  of  any  proceeding  under  any
         bankruptcy,  arrangement,  reorganization,   dissolution,  liquidation,
         insolvency  or  similar  law for the relief of or  otherwise  affecting
         creditors of the Debtor or  Guarantor/Indemnitor,  or by or against any
         guarantor or surety for the Debtor or Guarantor/Indemnitor, or upon the
         issue of any writ of  execution,  warrant,  attachment,  sequestration,
         levy,  third party demand,  notice of intention to enforce  security or
         garnishment or similar process against the Debtor, Guarantor/Indemnitor
         or any part of the Collateral;

vi)      COMMIT ACT OF BANKRUPTCY. The Debtor or Guarantor/Indemnitor commits or
         threatens to commit an act of bankruptcy;

vii)     DISSOLUTION,  WINDING UP. The  institution  by or against the Debtor or
         Guarantor/Indemnitor  of any  formal  or  informal  proceeding  for the
         dissolution or liquidation


                                     - 15 -


<PAGE>

         of, settlement of claims against or winding up of affairs of the Debtor
         or Guarantor/Indemnitor;

viii)    SALE IN BULK. The Debtor or  Guarantor/Indemnitor  makes or proposes to
         make any sale of its assets in bulk;

ix)      CHARGE  AGAINST  COLLATERAL.  If any right of  distress is levied or is
         threatened to be levied  against the  Collateral or if any  Encumbrance
         affecting the Collateral becomes  enforceable against the Collateral or
         any part thereof;

x)       DESTRUCTION  OF COLLATERAL.  Any material  portion of the Collateral is
         damaged or destroyed;

xi)      OTHER DEFAULT.  The Debtor or any  Guarantor/Indemnitor  defaults under
         any agreement with respect to any  indebtedness or other  obligation to
         any person other than the Secured  Party,  if such default has resulted
         in,  or may  result,  with  notice  or lapse of time or both,  in,  the
         acceleration  of any such  indebtedness  or  obligation or the right of
         such person to realize upon any Collateral; and

xii)     PERFORMANCE  IMPAIRED.  The Secured  Party in good faith  believes  the
         prospect of payment or performance of the  Obligations  hereunder is or
         is about to be  impaired  or that any  Collateral  is or is about to be
         placed in jeopardy.

7.2      Crystallization.

         The floating  charge created by Section 1.2 shall become a fixed charge
as soon as:

i)       the Secured Party gives notice to that effect to the Debtor;

ii)      the Secured Party takes any step to accelerate or demand payment of the
         Obligations,  or gives  notice of its  intention  or takes any steps to
         enforce its security; or

iii)     an Event of Default  described  in  Subsection  7.1(e) or (g) occurs in
         respect of the Debtor.

7.3      Demand Obligations.

         The fact that this  Security  Agreement  provides for Events of Default
and rights of  acceleration  shall not  derogate  from the demand  nature of any
Obligation payable on demand.

7.4      Waiver not to Affect Subsequent Breach.


                                     - 16 -


<PAGE>

         The Secured  Party may waive default or any breach by the Debtor of any
of the provisions  contained in this Security Agreement.  No waiver shall extend
to a subsequent breach or default,  whether or not the same as or similar to the
breach or default  waived.  No act or omission of the Secured Party shall extend
to or be taken in any  manner  whatsoever  to affect  any  subsequent  breach or
default of the Debtor or the rights of the Secured  Party  resulting  therefrom.
Any such  waiver  must to be in writing  and signed by the  Secured  Party to be
effective.

                                    SECTION 8
                       SECURED PARTY'S REMEDIES ON DEFAULT

8.1      Indebtedness Due and Rights and Remedies.

         Upon the occurrence of an Event of Default all of the Obligations shall
become immediately due and payable without notice to the Debtor, and the Secured
Party may, at its option, proceed to enforce payment of same and to exercise any
or  all  of  the  rights  and  remedies  contained  herein,  including,  without
limitation,  the  signification  and  collection  of the Debtor's  Accounts,  or
otherwise afforded by law, in equity or otherwise.  The Secured Party shall have
the right to  enforce  one or more  remedies  successively  or  concurrently  in
accordance  with  applicable  law and the Secured  Party  expressly  retains all
rights and remedies not  inconsistent  with the provisions  herein including all
the rights it may have under the PPSA, and,  without  restricting the generality
of the foregoing, the Secured Party may upon such Event of Default:

i)       APPOINTMENT  OF RECEIVER.  Appoint by instrument in writing a receiver,
         receiver  manager or receiver and manager  (herein a "RECEIVER") of the
         Debtor and of all or any part of the  Collateral  and remove or replace
         such  Receiver from time to time or may  institute  proceedings  in any
         court of competent  jurisdiction for the appointment of a Receiver. Any
         Receiver   appointed   by  the   Secured   Party  so  far  as  concerns
         responsibility for its acts shall be deemed the agent of the Debtor and
         not of the Secured  Party.  Where the  Secured  Party is referred to in
         this Section the reference  includes,  where the context  permits,  any
         Receiver so appointed and the officers,  employees,  servants or agents
         of such Receiver;

ii)      ENTER AND REPOSSESS.  Immediately and without notice enter the Debtor's
         premises and repossess, disable or remove the Collateral and the Debtor
         hereby  grants to the Secured Party a license to occupy any premises of
         the Debtor for the purpose of storage of the Collateral;

iii)     RETAIN THE  COLLATERAL.  Retain and  administer  the  Collateral in the
         Secured Party's sole and unfettered


                                     - 17 -


<PAGE>

         discretion,  which  the  Debtor  hereby  acknowledges  is  commercially
         reasonable;

iv)      DISPOSE OF THE COLLATERAL. Dispose of any Collateral by public auction,
         private tender or private contract with or without notice,  advertising
         or any other  formality,  all of which are hereby waived by the Debtor.
         The Secured  Party may, at its  discretion  establish the terms of such
         disposition,  including, without limitation, terms and conditions as to
         credit,  upset,  reserve bid or price. The Secured Party may also lease
         the Collateral on such terms as it deems appropriate.  The payments for
         Collateral,  whether on a disposition  or lease,  may be deferred.  All
         payments made pursuant to such  dispositions  shall be credited against
         the Obligations only as they are actually  received.  The Secured Party
         may buy in,  rescind or vary any  contract for the  disposition  of any
         Collateral  and may  dispose  of any  Collateral  again  without  being
         answerable for any loss occasioned  thereby.  Any such  disposition may
         take place whether or not the Secured Party has taken possession of the
         Collateral;

v)       FORECLOSE.  Foreclose  upon  the  Collateral  in  satisfaction  of  the
         Obligations.   The  Secured   Party  may  designate  any  part  of  the
         Obligations to be satisfied by the foreclosure of particular Collateral
         which  the  Secured  Party  considers  to have a net  realizable  value
         approximating the amount of the designated part of the Obligations,  in
         which case only the designated part of the Obligations  shall be deemed
         to be satisfied by the foreclosure of the particular Collateral;

vi)      CARRY ON BUSINESS.  Carry on or concur in the carrying on of all or any
         part of the  business  of the  Debtor  and  may,  m any  event,  to the
         exclusion of all others,  including the Debtor,  enter upon, occupy and
         use all  premises  of or  occupied or used by the Debtor and use any of
         the personal  property (which shall include fixtures) of the Debtor for
         such time and such  purposes as the Secured Party sees fit. The Secured
         Party  shall not be liable to the Debtor for any neglect in so doing or
         in  respect  of any rent,  cost,  charges,  depreciation  or damages in
         connection therewith;

vii)     PAYMENT  OF  ENCUMBRANCES.  Pay any  Encumbrance  that may  exist or be
         threatened against the Collateral. In any such case the amounts so paid
         together  with costs,  charges  and  expenses  incurred  in  connection
         therewith  shall be added to the  Obligations  secured by this Security
         Agreement;

viii)    PAYMENT OF DEFICIENCY. If the proceeds of realization are sufficient to
         pay all monetary Obligations, the


                                     - 18 -


<PAGE>

         Debtor shall forthwith pay or cause to be paid to the Secured Party any
         deficiency  and the  Secured  Party may sue the Debtor to  collect  the
         amount of such deficiency; and

ix)      DEALING WITH  COLLATERAL.  Subject to  applicable  law seize,  collect,
         realize,  borrow money on the security  of,  release to third  parties,
         sell (by way of public or private  sale),  lease or otherwise deal with
         the Collateral in such manner, upon such terms and conditions,  at such
         time or times  and place or places  and for such  consideration  as may
         seem to the Secured Party  advisable and without  notice to the Debtor.
         The  Secured  Party may charge on its own behalf and pay to others sums
         for expenses  incurred and for services rendered  (expressly  including
         legal  services,  consulting,  receivers and accounting  fees) in or in
         connection  with  seizing,  collecting,  realizing,  borrowing  on  the
         security of, selling or obtaining payment of the Collateral and may add
         such sums to the Obligations secured by the Security Agreement.

8.2      Assemble the Collateral.

         To assist the Secured  Party in the  implementation  of such rights and
remedies the Debtor will, at its own risk and expense and at the Secured Party's
request,  assemble and prepare for removal such items of the  Collateral  as are
selected for the Secured Party as shall,  in the Secured  Party's sole judgment,
have a value sufficient to cover all the Obligations.

8.3      Secured Party Not Liable for Failure to Exercise Remedies.

         The Secured Party shall not be liable or  accountable  for any delay or
failure to exercise its remedies,  take possession of, seize, collect,  realize,
sell,  lease or otherwise  dispose of or obtain payment for the Collateral.  The
Secured Party shall not be bound to institute  proceedings  for such purposes or
for the  purpose of  preserving  any  rights,  remedies or powers of the Secured
Party,  the Debtor or any other person in respect of the  Collateral  or against
any Account Debtor.

8.4      Allocation of Proceeds.

         All monies collected or received by the Secured Party in respect of the
Collateral  may be held by the  Secured  Party and may be  applied on account of
such parts of the Obligations at the sole discretion of the Secured Party.

8.5      Extension of Time.

         The Secured Party may grant  extensions of time and other  indulgences,
take and give up securities, accept


                                     - 19 -

<PAGE>

compositions,  grant  releases and  discharges,  release the Collateral to third
parties and otherwise  deal with the Debtor's  guarantors or sureties and others
and with the  Collateral  and other  securities as the Secured Party may see fit
without  prejudice to the liability of the Debtor to the Secured  Party,  or the
Secured Party's rights, remedies and powers under this Security Agreement.

8.6      Forbearance is not Waiver.

         No extension of time,  forbearance,  indulgence or other  accommodation
now,  heretofore  or  hereafter  given by the Secured  Party to the Debtor shall
operate as a waiver,  alteration  or amendment of the right of the Secured Party
or otherwise preclude the Secured Party from enforcing such rights.

8.7      Effect of Appointment of Receiver.

         As soon as the Secured  Party takes  possession  of any  Collateral  or
appoints a  Receiver,  all  powers,  functions,m  rights and  privileges  of the
directors  and  officers of the Debtor  with  respect to that  Collateral  shall
cease, unless specifically continued by the written consent of the Secured Party
or the Receiver.

8.8      Limitation of Liability.

         The  Secured  Party  shall not be liable by reason of any entry into or
taking  possession of any of the Collateral  hereby charged or intended so to be
or any part  thereof,  to account as  mortgagee  in  possession  or for anything
except actual  receipts or be liable for any loss on  realization  or any act or
omission for which a secured  party in  possession  might be liable.  The Debtor
acknowledges and agrees that any and all payments, responsibilities, obligations
and  liabilities in respect of the  Collateral  shall remain those of the Debtor
and no such payments,  responsibilities  obligations or liabilities are assigned
hereby nor are assumed or incurred by the Secured Party hereunder.

8.9      Release by Debtor.

         The Debtor  hereby  releases and  discharges  the Secured Party and the
Receiver  from every  claim of every  nature,  whether in sounding in damages or
not, which may arise or be caused to the Debtor or any person  claiming  through
or under the  Debtor by  reason  or as a result  of any act or  omission  of the
Secured Party or any successor or assign  claiming  through or under the Secured
Party or the Receiver  under the  provisions of this Security  Agreement  unless
such claim is the result of dishonesty or gross neglect.

8.10     Performance by Secured Party.


                                     - 20 -


<PAGE>

         Nothing  herein shall  obligate the Secured  Party to assume or perform
any obligation of the Debtor to any third party in respect or arising out of the
Collateral.  The Debtor  agrees to indemnify and save harmless the Secured Party
from any and all claims of such third parties.  The Secured Party may however at
its option  assume or  perform  any such  obligations  which the  Secured  Party
considers necessary or desirable to obtain the benefit of the Collateral, or any
part  thereof,  free of any set off,  deduction  or  abatement  and any money so
expended by the Secured Party shall form part of the  Obligations and shall bear
interest at the highest  rate per annum from time to time charged by the Secured
party on any of the other Obligations.

                                    SECTION 9
                                  MISCELLANEOUS

9.1      Costs.

         The Debtor will indemnify and reimburse the Secured Party on demand for
all interest,  commissions,  costs of  realization  and other costs and expenses
(including  the full amount of all legal fees and  expenses  paid by the Secured
Party) incurred by the Secured Party or any Receiver in connection with:

i)       the perpetual  registration  of any financing  statement  registered in
         connection with the security interests hereby created;

ii)      the preparation,  execution, perfection, protection, enforcement of and
         advice with respect to this Security Agreement;

iii)     the realization,  disposition of,  retention,  protection,  insuring or
         collection of any Collateral;

iv)      the protection or enforcement of the rights, remedies and powers of the
         Secured  Party  or  any  Receiver,   including,   without   limitation,
         participation,  preparation  and advice with  respect to any actions or
         proceedings  commenced  or  threatened  by or against the Debtor or any
         Guarantor/Indemnitor;

v)       the inspection of the Collateral;

vi)      investigating title to the Collateral;

vii)     the  compliance  by the Secured  Party with all  demands  made upon the
         Secured Party to amend,  extend,  cancel or discharge any registrations
         and filings related hereto; and

viii)    any other cost related hereto.


                                     - 21 -


<PAGE>

All amounts for which the Debtor is required  hereunder to reimburse the Secured
Party or any Receiver shall,  from the date of  disbursement  until the date the
Secured Party, or the Receiver receives reimbursement, be deemed advanced to the
Debtor by the Secured Party,  shall be deemed to be  Obligations  and shall bear
interest at the highest  rate per annum from time to time charged by the Secured
Party on any of the other Obligations.

9.2      Appointment of Attorney.

         The Debtor constitutes and appoints the Secured Party, or any Receiver,
the true and  lawful  attorney  of the  Debtor  irrevocably  with full  power of
substitution  to do,  make and execute all such  assignments,  documents,  acts,
matters  or things  with the right to use the name of the  Debtor  whenever  and
wherever it may be deemed  necessary or expedient.  The Debtor  hereby  declares
that the irrevocable  power of attorney  granted  hereby,  being coupled with an
interest, is given for valuable consideration.

9.3      No Obligation to Make Advances.

         Nothing  herein shall obligate the Secured Party to make any advance or
loan or further  advance  or extend  credit to the Debtor  and,  in  particular,
nothing  herein  shall  obligate  the Secured  Party to advance  any  unadvanced
portion of any loan or credit to the Debtor after the  occurrence of an Event of
Default. Except to the extent that the Secured Party:

i)       by accepting bills of exchange drawn on it by the Debtor; or

ii)      by issuing letters of credit or letters of guarantee on the application
         of the Debtor,

is  required  to advance  monies on the  maturity  of those bills or pursuant to
those letters of credit or letters of guarantee, as the case may be, none of the
preparation, execution, perfection or registration of this Security Agreement or
the advance of any monies by the Secured  Party shall bind the Secured  party to
make any further advance.

9.4      Security Interests Effective Immediately.

         Neither the  execution of nor any filing with respect to, this Security
Agreement  shall bind the Secured  Party to grant any credit to the Debtor,  but
the security  interests  hereby  created  shall take effect  forthwith  upon the
execution of this Security Agreement by the Debtor.

9.5      Security in Addition and not in Substitution, Remedies Cumulative.


                                     - 22 -


<PAGE>

                  The rights,  remedies and powers  conferred  by this  Security
Agreement  are in addition to, and not in  substitution  for, any other  rights,
remedies or powers the Secured Party may have under this Security Agreement,  at
law, in equity or by or under the PPSA or any other  statute.  The Secured Party
may proceed by way of any action,  suit or other  proceeding at law or in equity
and no right,  remedy or power of the  Secured  Party shall be  exclusive  of or
dependent  on any other.  The  Secured  Party may  exercise  any of its  rights,
remedies or powers separately or in combination and at any time.

9.6      Statutory Waivers.

         To the fullest  extent  permitted by law, the Debtor  waives all of the
rights,  benefits  and  protection  given by the  provisions  of any existing or
future statute which imposes limitations upon the rights,  remedies or powers of
a Secured Party or upon the methods of  realization  of security,  including any
seize or sue or  anti-deficiency  statute or any similar provisions of any other
statute.  In particular,  the Debtor waives all rights,  benefits and protection
given by the Civil  Enforcement Act and sections 47 to 50 of the Law of Property
Act of the Province of Alberta insofar as they extend to or relate to any of the
Collateral.  The Limitation of Civil Rights Act of the Province of  Saskatchewan
shall not apply to the security  interests  hereby created or any of the rights,
remedies powers of the Secured Party or any Receiver.

9.7      Provisions Reasonable.

         The Debtor  acknowledges that the provisions of this Security Agreement
and, in particular,  those respecting rights, remedies and powers of the Secured
Party and any Receiver against the Debtor,  its business and any Collateral upon
an  Event  of  Default,   are   commercially   reasonable   and  not  manifestly
unreasonable.

9.8      Further Assurances.

         The Debtor shall at all times, do, execute,  acknowledge and deliver or
cause to be done,  executed,  acknowledged  or delivered  all such further acts,
deeds, transfers, assignments, security agreements and assurances as the Secured
Party may reasonably  require in order to give effect to the  provisions  hereof
and for the better granting,  transferring,  assigning,  charging, setting over,
assuring, confirming or perfecting the security interests hereby created and the
priority accorded to them by law or under this Security Agreement.

9.9      Notices.

i)       Every notice,  demand and other  communication  in connection with this
         Security Agreement (including,  without limitation, notices required or
         permitted


                                     - 23 -


<PAGE>

         under the  Bankruptcy  and  Insolvency  Act) and all legal  process  in
         regard hereto shall be validly given,  made or served if in writing and
         delivered to, or mailed,  postage prepaid,  or telecopied or telexed or
         sent by other similar form of communication  (collectively  "ELECTRONIC
         COMMUNICATION")  to the intended recipient at its address first written
         above and if to the Debtor to the  attention of President and if to the
         Secured  Party to the  attention of Manager or to such other address or
         person as the other may from time to time designate by notice.

ii)      Any  notice,  requisition,  demand  or  other  instrument,  (including,
         without limitation,  notices required or permitted under the Bankruptcy
         and Insolvency Act) if delivered, shall be deemed to have been given or
         made on the day on which  it was  delivered  and if sent by  Electronic
         Communication  shall  be  deemed  to  have  been  given  or made on the
         business  day next  following  the day on which it was so sent,  and if
         mailed shall be deemed to have been given or made on the third business
         day following  the day on which it was so mailed.  Any party hereto may
         give written notice of a change of address in the same manner, in which
         event any notice shall  thereafter be given to it as above  provided at
         such changed address.

9.10     Discharge.

         Upon payment and performance by the Debtor of the  Obligations  secured
hereby the Secured Party shall upon request in writing by the Debtor  deliver up
this  Security  Agreement  to the Debtor and shall at the  expense of the Debtor
cancel and  discharge  the  security  interests  hereby  created and execute and
deliver to the Debtor such  documents as shall be  requisite  to  discharge  the
security interests hereby created.

9.11     Delivery of Copy/Waiver.

The      Debtor hereby acknowledges receiving a copy of this Security Agreement.
         The Debtor  waives all rights to receive from the Secured  Party a copy
         of any financing statement or financing change statement  registered or
         verification  statement  issued at any time in respect of this Security
         Agreement.

9.12     Release of Information.

The      Debtor  hereby  authorizes  the Secured Party to provide a copy of this
         Security  Agreement and such other information  (including full details
         of the  Obligations) as may be requested of me Secured Party by persons
         entitled thereto under the PPSA.

9.13     Inspection, Management and Repairs.


                                     - 24 -


<PAGE>

                  The Debtor  covenants  and agrees that the Secured  Party may,
but shall be under no obligation  to, at such time or times as the Secured Party
deems  necessary and without the  concurrence  of the Debtor or any other person
make such arrangements for the repairing,  finishing and putting in order of the
Business Premises, including, without limitation, such repairs, replacements and
improvements  as are  necessary  so that the  Debtor and the  Business  Premises
comply with Environmental  Laws, and all reasonable costs,  charges and expenses
including,  an  allowance  for the time and services of the Secured  Party,  the
Secured Party's servants or agents or any other person or persons  appointed for
the above purposes including,  without limitation,  the full amount of all legal
fees,  disbursements,  costs, charges and expenses incurred by the Secured Party
and any amount due hereunder  shall be payable  forthwith to the Secured  Party,
shall be deemed an advance to the Debtor by the Secured  Party,  shall be deemed
to be  Obligations,  and shall bear  interest at the highest rate per annum from
time to time charged by the Secured Party on any of the other  Obligations until
paid.

9.14     Hazardous Materials and Environmental Laws.

         The Debtor represents and warrants to the Secured Party that:

i)       the Business  Premises are not insulated with urea  formaldehyde and do
         not contain any asbestos material or underground tanks;

ii)      the Business Premises are free of any Hazardous Materials;

iii)     the Business  Premises are not currently used in a manner,  and, to the
         Debtor's  knowledge,  after having made due  inquiry,  no prior use has
         occurred,  which is contrary to any laws, regulations,  orders, bylaws,
         permits or lawful requirements of any Environmental Laws; and

iv)      there  are  no  existing  or  threatened  claims,  actions,  orders  or
         investigations  under any  Environmental  Laws  against  the  Debtor or
         against the Business Premises.

9.15     Authorization of Inquiries.

         The Debtor hereby  authorizes  the Secured party to make inquiries from
time  to  time  of any  governmental  authority  with  respect  tot he  Debtor's
compliance  with  Environmental  Laws and the Debtor agrees that the Debtor will
from time to time provide to the Secured  Party with such written  authorization
as the Secured Party may reasonably require in order to facilitate the obtaining
of such information.

9.16     Indemnification.


                                     - 25 -

<PAGE>

i)       The Debtor shall  indemnify,  reimburse  and save  harmless the Secured
         Party, any receiver,  its directors  officers,  employees,  agents, and
         successors and assigns, from any and all liabilities, actions, damages,
         claims,  losses,  costs  and  expenses  whatsoever  (including  without
         limitation,  the full  amount of all legal  fees,  costs,  charges  and
         expenses  and the cost of removal,  treatment,  storage and disposal of
         any Hazardous Materials and remediation of the Business Premises) which
         may be paid,  incurred or asserted  against the Secured Party for, with
         respect  to or as a direct or  indirect  result of the  presence  on or
         under, or the escape, seepage, leakage, spillage,  discharge,  emission
         or release from, the Business  Premises or into or upon any other land,
         the  atmosphere  or any  watercourse,  body of water or  wetland of any
         Hazardous Materials.

ii)      Any  amount  owing  by the  Debtor  hereunder  shall,  from the date of
         disbursement  until the date the recipient receives  reimbursement,  be
         deemed advanced to the Debtor by the Secured party,  shall be deemed to
         be  obligations  and shall bear  interest at the highest rate per annum
         from  time to time  charged  by the  Secured  party on any of the other
         Obligations until paid.

iii)     The  Debtor  agrees  that the  indemnity  obligations  hereunder  shall
         survive the release of the security of this Security  Agreement and the
         payment and  satisfaction of the  indebtedness  and liabilities  hereby
         secured,  but only  insofar  as such  indemnity  obligations  relate to
         liabilities,  actions,  damages,  claims,  losses,  costs and  expenses
         arising in connection with Hazardous Material that were on the Business
         Premises prior to such release, payment and satisfaction.

                                   SECTION 10
                                 INTERPRETATION

10.1     Entire Agreement/Amendment.

         This  Security  Agreement  contains  the entire  agreement  between the
parties relating to the security interests hereby created. Any amendment of this
Security  Agreement  shall not be binding  unless in  writing  and signed by the
Secured  Party  and  the  Debtor.   The  Debtor   confirms  that  there  are  no
representations,  warranties, covenants or acknowledgements affecting, or relied
upon in entering this Security Agreement.

10.2     Severability.

         Any provision of this Security Agreement prohibited by law or otherwise
ineffective  shall  be  effective  only to the  extent  of such  prohibition  or
ineffectiveness and shall be


                                     - 26 -


<PAGE>

severable without invalidating or otherwise affecting the
remaining provisions hereof.

10.3     Joint and Several Liability.

         If more than one person  executes  this  Security  Agreement as Debtor,
their Obligations hereunder and the liability resulting therefrom shall be joint
and several.

10.4     Headings.

         All headings and titles in this  Security  Agreement  are for reference
only and are not to be used in the interpretation of the terms hereof.

10.5     Included Words.

         Wherever the singular or the masculine are used herein,  the same shall
be deemed to include the plural or the feminine or the body politic or corporate
where the context or the parties so require.

10.6     Applicable Law.

         This Security  Agreement shall be construed and enforceable  trader and
in accordance with the laws of Alberta.

10.7     Binding Effect.

         This  Security  Agreement  shall  be  binding  on the  Debtor  and  its
successors,  heirs,  administrators and executors and shall enure to the benefit
of the Secured Party and its successors and assigns.


                                  Execution
                                  Date


Officer                        Y     M     D        Transferor(s) Signature(s)
Signature(s)                                        J.R.S. EXPLORATION
                                                    COMPANY LIMITED
                                                    by its authorized signatory
/s/ Donald E. Janveau
- ---------------------

/s/ Garnet W. Mueller
- ---------------------

                                                    /s/ Donald E. Janveau
                                                    ---------------------------
                                                    DONALD E. JANVEAU
                                                    President


                                     - 27 -



                          TRADEMARK SECURITY AGREEMENT


         THIS TRADEMARK SECURITY AGREEMENT ("Security  Agreement"),  dated as of
November 17, 1997, is executed by and between 3-D GEOPHYSICAL,  INC., a Delaware
corporation  ("Grantor"),  and Sanwa  Business  Credit  Corporation,  a Delaware
corporation ("Lender").

                                    RECITALS

         A.  Grantor  has  executed  in favor of Lender a guaranty  and  certain
related documents dated as of November 17, 1997  (collectively,  the "Guaranty")
in connection with loans made by Lender to Northern Geophysical of America, Inc.

         B. To secure  Grantor's  obligations  under the  Guaranty,  Grantor has
agreed to deliver this duly executed Security Agreement to Lender.

                                    AGREEMENT

         NOW,  THEREFORE,  in  consideration of the above recitals and for other
good and  valuable  consideration,  the receipt and adequacy of which are hereby
acknowledged, Grantor hereby agrees with Lender as follows:

         1.  Definitions  and   Interpretation.   When  used  in  this  Security
Agreement, the following terms shall have the following respective meanings:

                  "Affiliate"  shall  mean any  person  or  entity  controlling,
         controlled by or under common control with another person or entity.

                  "Collateral"  shall  have the  meaning  given to that  term in
         Paragraph 2 hereof.

                  "Obligations"  shall mean and  include  all  loans,  advances,
         debts, liabilities and obligations,  howsoever arising, owed by Grantor
         to Lender of every kind and  description  (whether or not  evidenced by
         any note or  instrument  and  whether or not for the payment of money),
         direct or indirect,  absolute or contingent,  due or to become due, now
         existing or hereafter  arising  pursuant to the terms of the  Guaranty,
         including without  limitation all interest,  fees,  charges,  expenses,
         attorneys'  fees and  accountants'  fees  chargeable  to and payable by
         Grantor hereunder and thereunder.

                  "Patent and  Trademark  Office"  shall mean the United  States
         Patent and Trademark Office or any successor office or agency thereto.

                  "Trademarks" shall have the meaning given to that term in


<PAGE>

         Attachment I hereto.

                  "UCC" shall mean the Uniform  Commercial  Code as in effect in
         the State of California from time to time.

                  Unless otherwise  defined herein,  all other capitalized terms
used herein and defined in the Guaranty shall have the respective meanings given
to those terms in the Guaranty,  and all terms defined in the UCC shall have the
respective meanings given to those terms in the UCC.

                  2.  Grant  of  Security   Interest.   As   security   for  the
Obligations,  Grantor hereby pledges,  mortgages and grants to Lender a security
interest in the property described in Attachment I annexed hereto  (collectively
and severally,  the "Collateral"),  which Attachment I is incorporated herein by
this reference.

                  3.  Representations  and  Warranties.  Grantor  represents and
warrants to Lender that:

                  (a) Grantor is the owner of the Collateral (or, in the case of
         after-acquired  Collateral,  at the time Grantor acquires rights in the
         Collateral,  will be the owner  thereof)  and that no other  Person has
         (or,  in the case of  after-acquired  Collateral,  at the time  Grantor
         acquires rights therein, will have) any right, title, claim or interest
         (by way of Lien or otherwise) in, against or to the Collateral;

                  (b) Lender has (or in the case of  after-acquired  Collateral,
         at the  time  Grantor  acquires  rights  therein,  will  have)  a first
         priority perfected security interest in the Collateral;

                  (c) Grantor has full  corporate  power and  authority to grant
         the security interest herein granted, and the execution and delivery of
         this  Security   Agreement  by  Grantor  and  the  performance  of  its
         obligations  hereunder,  have been  duly  authorized  by all  necessary
         corporate action on the part of Grantor;

                  (d) Grantor does not own any Trademarks  registered in, or the
         subject of pending  applications in, the Patent and Trademark Office or
         any similar  offices or agencies in any other  country or any political
         subdivision  thereof,  other  than  those  described  in  Schedule A or
         Schedule B to Attachment I hereto;

                  (e) Grantor has the sole and full right, title and interest in
         and to each of the  Trademarks  shown on  Schedule  A to  Attachment  I
         hereto for the goods and services covered by the registrations thereof,
         unencumbered  except as set forth in Schedule C to Attachment I hereto,
         and such  registrations are valid and enforceable and in full force and
         effect;


                                      - 2 -


<PAGE>

                  (f) There is no claim by any third  party that any  Trademarks
         are  invalid or  unenforceable  or do or may  violate the rights of any
         Person;

                  (g) All licenses of  Trademarks  which  Grantor has granted to
         any Person are set forth in Schedule C to Attachment I hereto; and

                  (h) All licenses of Trademarks which any Person has granted to
         Grantor are set forth in Schedule D to Attachment I hereto.

         4. Covenants of Grantor. Grantor hereby agrees:

                  (a) Grantor shall perform all acts and execute all  documents,
         including,   without   limitation,    Grants   of   Security   Interest
         substantially in the form of Attachment II annexed hereto,  that may be
         necessary  or  desirable  to record,  maintain,  preserve,  protect and
         perfect Lender's interest in the Collateral, the Lien granted to Lender
         in the Collateral and the first priority of such Lien;

                  (b)  Except to the  extent  that  Lender  shall give its prior
         written consent,

                           (i) Grantor shall  continue to use the  Trademarks in
                  connection with each and every  trademarked  class of goods or
                  services  applicable  to its current  line as reflected in its
                  current catalogs,  brochures, price lists or similar materials
                  in order to maintain the  Trademarks  in full force and effect
                  free from any claim of  abandonment  for  nonuse,  and Grantor
                  shall not (and will not permit any licensee thereof to) do any
                  act or omit to do any act  whereby  any  Trademark  may become
                  invalidated  and shall notify  Lender  immediately  if Grantor
                  knows of any reason or has reason to know that any application
                  or registration may become invalidated; and

                           (ii) Grantor shall not assign, sell, mortgage, lease,
                  transfer, pledge, hypothecate, grant a security interest in or
                  Lien  upon,  encumber,  grant an  exclusive  or  non-exclusive
                  license,  or otherwise  dispose of any of the Collateral,  and
                  nothing in this Security  Agreement  shall be deemed a consent
                  by Lender to any such  action  except as  expressly  permitted
                  herein;

                  (c) Grantor  shall  promptly  pay Lender for any and all sums,
         costs,  and  expenses  which  Lender may pay or incur  pursuant  to the
         provisions of this Security  Agreement or in enforcing the Obligations,
         the Collateral or the security interest granted  hereunder,  including,
         without  limitation,   all  filing  or  recording  fees,  court  costs,
         collection  charges,   travel,  and  reasonable   attorneys'  fees  and
         expenses,  all of which together with interest at the highest rate then
         payable on the Obligations


                                      - 3 -


<PAGE>

         shall be part of the Obligations and be payable on demand;

                  (d) Grantor shall promptly  notify Lender upon the filing with
         the Patent and Trademark  Office or any similar office or agency in any
         other country or any political  subdivision thereof,  either by Grantor
         or by any agent,  employee,  licensee or designee of Grantor, of (i) an
         application  for the  registration of any Trademark with the Patent and
         Trademark  Office or any similar  office or agency in any other country
         or any  political  subdivision  thereof or (ii) any  assignment  of any
         Trademark  which  Grantor  may  acquire  from a third  party.  Upon the
         request  of Lender,  Grantor  shall  execute  and  deliver  any and all
         documents,  instruments,  and  agreements  as  Lender  may  request  to
         evidence Lender's security interest in such Trademark (and the goodwill
         and general  intangibles  of Grantor  relating  thereto or  represented
         thereby),   and  Grantor   authorizes   Lender  to  amend  an  original
         counterpart  of the  applicable  Grant of  Security  Interest  executed
         pursuant to Subparagraph 4(a) of this Security  Agreement without first
         obtaining Grantor's approval of or signature to such amendment,  and to
         record such security interest with the Patent and Trademark Office;

                  (e)  Grantor  shall  keep the  Collateral  free of all  Liens,
         except in favor of Lender;

                  (f) Grantor shall take all necessary  steps in any  proceeding
         before the Patent and Trademark  Office or any similar office or agency
         in  any  other  country  or  any  political   subdivision  thereof,  to
         diligently prosecute or maintain,  as applicable,  each application and
         registration of the Trademarks;

                  (g) So long as any of the Obligations are outstanding, Grantor
         shall make  application to the Patent and Trademark  Office (and assign
         any  such   application   to  Lender  as   security)  to  register  any
         registerable  but unregistered  material  Trademarks used by Grantor in
         connection  with its  products  or  services,  unless  Grantor,  in the
         exercise of its prudent business judgment, deems any such Trademark not
         to have any significant  commercial value or determines that its rights
         thereunder are better preserved as a trade secret;

                  (h)  Grantor  shall  (i)  use  proper   statutory   notice  in
         connection with any use of the Trademarks, and (ii) maintain consistent
         standards  of quality in its  manufacture  of  products  sold under the
         Trademarks or provision of services in connection with the Trademarks;

                  (i) Grantor  agrees that if it or any Affiliate  learns of any
         use by any Person of any term or design likely to cause  confusion with
         any Trademark,  Grantor shall promptly notify Lender of such use and of
         all  steps  taken  and to be taken to remedy  any  infringement  of any
         Trademark; and


                                      - 4 -


<PAGE>

                  (j) Grantor  shall at all times keep at least one complete set
         of its records  concerning the Collateral at its chief executive office
         and shall make such records  available for inspection by Lender at such
         times as Lender may reasonably request.

         5. Authorized Action by Lender.

                  (a) Lender may, in its sole  discretion,  pay any amount or do
         any act  required  of  Grantor  hereunder  or  requested  by  Lender to
         preserve,  defend,  protect,  maintain,  record  or  enforce  Grantor's
         obligations contained herein, the Obligations,  the Collateral,  or the
         right,  title and interest  granted Lender by this Security  Agreement,
         and which  Grantor  fails to do or pay, and any such  payment  shall be
         deemed an advance  by Lender to Grantor  and shall be payable on demand
         together  with  interest  at  the  highest  rate  then  payable  on the
         Obligations.

                  (b)  Grantor  agrees to execute  and  deliver to Lender  three
         originals of a Special Power of Attorney in  substantially  the form of
         Attachment  III  to  this  Agreement  for  the  implementation  of  the
         recording,  giving of notice,  preservation,  assignment, sale or other
         disposal of the  Collateral  pursuant to Paragraph 2 and  Subparagraphs
         5(a) and 7(a).

                  (c)  Grantor  hereby  grants to Lender and its  employees  and
         agents  the  right  to visit  Grantor's  business  facilities  at which
         Grantor manufactures  products or provides services,  which products or
         services  are sold  under or  provided  in  connection  with any of the
         Trademarks,  and to  inspect  such  products  and the  quality  control
         records relating thereto or observe the provision of such services.

         6. Litigation and Other Proceedings.

                  (a)  Unless   Grantor   determines  in  the  exercise  of  its
         reasonable  business  judgment  that (i) the  Trademark  at issue is of
         immaterial  value and (ii) loss of the exclusive use of such  Trademark
         would  not  have a  material  adverse  effect  on  Grantor's  condition
         (financial or otherwise) or on the  collateral,  Grantor shall have the
         obligation to commence and diligently prosecute such suits, proceedings
         or other actions for infringement or other damage,  or reexamination or
         reissue proceedings,  or opposition or cancellation  proceedings as are
         reasonable to protect any of the Trademarks.  No such suit,  proceeding
         or other actions shall be settled or voluntarily  dismissed,  nor shall
         any party be  released  or excused of any  claims of or  liability  for
         infringement,  without  the prior  written  consent  of  Lender,  which
         consent shall not be


                                      - 5 -


<PAGE>

         unreasonably withheld.

                  (b) Upon the  occurrence  and  during the  continuation  of an
         Event of Default, Lender shall have the right but not the obligation to
         bring suit or institute proceedings in the name of Grantor or Lender to
         enforce any rights in the Collateral, including any license thereunder,
         in which  event  Grantor  shall at the request of Lender do any and all
         lawful acts and execute any and all documents required by Lender in aid
         of such enforcement.  If Lender elects not to bring suit to enforce any
         right under the Collateral,  including any license thereunder,  Grantor
         agrees to use all reasonable measures,  whether by suit,  proceeding or
         other  action,  to  prevent  the  infringement  of any right  under the
         Collateral  by any Person  and for that  purpose  agrees to  diligently
         maintain  any  action,   suit  or  proceeding  against  any  Person  so
         infringing necessary to prevent such infringement.

         7. Default and Remedies.

                  (a)  Grantor  shall be deemed in default  under this  Security
         Agreement  upon  the  occurrence  of an  Event  of  Default.  Upon  the
         occurrence  and during the  continuation  of any such Event of Default,
         Lender may, at its option,  and (except if otherwise  specified  below)
         without  notice to or demand on Grantor,  and in addition to all rights
         and  remedies  available to Lender under the Guaranty or the other loan
         documents, do any one or more of the following:

                           (i) upon ten (10)  days'  prior  notice  to  Grantor,
                  direct  Grantor not to make any further use of the  Trademarks
                  (or any mark similar thereto) for any purpose;

                           (ii) at any time and from time to time, upon ten (10)
                  days'  prior  notice to  Grantor,  license,  whether  general,
                  special  or   otherwise,   and  whether  on  an  exclusive  or
                  nonexclusive basis, any of the Trademarks throughout the world
                  for  such  term  or  terms,  on such  conditions,  and in such
                  manner, as Lender shall in its sole discretion determine;

                           (iii) at any time and from time to time, enforce (and
                  upon notice to Grantor  have the  exclusive  right to enforce)
                  against any licensee or sublicensee all rights and remedies of
                  Grantor  in, to and under any one or more  license  agreements
                  with  respect  to  the   Collateral   (without   assuming  any
                  obligations or liability thereunder), and take or refrain from
                  taking any action under any thereof;

                           (iv) at any time and from time to time, upon ten (10)
                  days' prior


                                      - 6 -


<PAGE>

                  notice to Grantor,  assign, sell, or otherwise dispose of, the
                  Collateral  or any of it,  either  with or without  special or
                  other  conditions  or  stipulations,  with  power  to buy  the
                  Collateral  or any part of it,  and with power also to execute
                  assurances,  and do all other acts and  things for  completing
                  the assignment, sale or disposition which Lender shall, in its
                  sole discretion, deem appropriate or proper; and

                           (v)  in  addition  to  the  foregoing,  in  order  to
                  implement the assignment, sale or other disposal of any of the
                  Collateral  pursuant to clause (a)(iv) hereof,  Lender may, at
                  any time,  pursuant to the  authority  granted in the Power of
                  Attorney   executed  pursuant  to  Subparagraph  5(b)  hereof,
                  execute  and  deliver  on  behalf  of  Grantor,  one  or  more
                  instruments   of   assignment  of  the   Trademarks   (or  any
                  application for  registration  thereof),  in form suitable for
                  filing, recording or registration in any country.

                  (b)  Grantor  agrees  to pay  when  due all  reasonable  costs
         incurred in any such  transfer of the  Trademarks,  including,  without
         limitation,   any  taxes,  fees  and  reasonable  attorneys'  fees  and
         expenses, and all such costs shall be added to the Obligations.  Lender
         may  apply  the  proceeds  actually  received  from any  such  license,
         assignment,  sale or other  disposition  to the  reasonable  costs  and
         expenses thereof, including, without limitation,  reasonable attorneys'
         fees and all legal,  travel and other expenses which may be incurred by
         Lender,  and then to the Obligations,  in such order as to principal or
         interest as Lender may desire; and Grantor shall remain liable and will
         pay Lender on demand any deficiency  remaining,  together with interest
         thereon  at a rate  equal  to the  highest  rate  then  payable  on the
         Obligations  and the balance of any  expenses  unpaid.  Nothing  herein
         contained  shall be  construed  as  requiring  Lender  to take any such
         action at any time. In the event of any such license,  assignment, sale
         or  other  disposition  of the  Collateral,  or any  of it,  after  the
         occurrence  or  continuation  as  hereinabove  provided  of an Event of
         Default,  Grantor shall supply its know-how and  expertise  relating to
         the manufacture  and sale of the products  bearing the Trademarks or in
         connection  with which the  Trademarks  are used,  and its  consumer or
         customer lists and other records  relating to the Trademarks and to the
         distribution  of products or the  provisions of services,  to Lender or
         its designee.


                                      - 7 -


<PAGE>

                  (c) In  furtherance  of  Lender's  rights  hereunder,  Grantor
         hereby  grants  to  Lender  an   irrevocable,   non-exclusive   license
         (exercisable  without  royalty  or other  payment  by  Lender)  to use,
         license or  sublicense  any Trademark in which Grantor now or hereafter
         has any right,  title or interest  together with the right of access to
         all  media in which any  Trademark  may be  recorded  or  stored.  Such
         license shall be  exercisable  only upon the  occurrence and during the
         continuation  of an Event of Default (after any applicable cure periods
         have expired).

         8.  Reassignment.  Upon the payment in full of the  Obligations and the
termination  of  the  Guaranty  and  Lender's  obligation  to  provide  advances
thereunder,  Lender  shall  execute  and  deliver to  Grantor  (at no expense to
Lender) all  assignments  and other  instruments  as may be necessary to vest in
Grantor full right, title and interest in and to the Collateral,  subject to any
disposition  thereof  which  may  have  been  made  by  Lender  pursuant  to the
provisions of this Security Agreement.

         9. Indemnification and Release.

                  (a) Grantor assumes all  responsibility  and liability arising
         from the use of the  Trademarks,  and Grantor shall  indemnify and hold
         Lender and its directors,  officers, employees, agents and any of their
         respective  Affiliates  ("Indemnitees")  harmless  from and against any
         claim, suit, loss, damage or expense  (including,  without  limitation,
         reasonable   attorneys'  fees  and  expenses)  arising  out  of  or  in
         connection  with any alleged  infringement  of any trademark or alleged
         defect in any product manufactured, promoted or sold by Grantor (or any
         Affiliate of Grantor) in connection  with any Trademark,  or out of the
         manufacture,  promotion, labeling, sale or advertisement of any product
         or service by Grantor (or any  Affiliate  of Grantor).  Grantor  agrees
         that Lender does not assume, and shall have no responsibility  for, the
         payment  of any  sums due or to  become  due  under  any  agreement  or
         contract   included  in  the  Collateral  or  the  performance  of  any
         obligations to be performed under or with respect to any such agreement
         or contract by Grantor, and Grantor hereby agrees to indemnify and hold
         each  Indemnitee  harmless  with  respect  to any and all claims by any
         Person relating thereto.

                  (b)  Grantor  agrees to  indemnify  and hold  each  Indemnitee
         harmless  from and against  any claim,  suit,  loss,  damage or expense
         (including,   without  limitation,   reasonable   attorneys'  fees  and
         expenses)  arising  out of or in  connection  with any action  taken or
         omitted to be taken by Lender pursuant to clause  7(a)(iii) hereof with
         respect to any license agreement of Grantor.

                  (c)  Grantor  agrees to  indemnify  and hold  each  Indemnitee
         harmless


                                      - 8 -


<PAGE>


         from and against any claim,  suit, loss, damage or expense  (including,
         without  limitation,  reasonable  attorneys' fees and expenses) arising
         out  of or in  connection  with  (i)  any  claim,  suit  or  proceeding
         instituted  by Grantor or (ii) any action  taken or omitted to be taken
         by Lender pursuant to Subparagraph 6(b).

                  (d) Grantor hereby releases the  Indemnitees  from any claims,
         causes of action and demands at any time arising out of or with respect
         to any actions  taken or omitted to be taken by the  Indemnitees  under
         the powers of  attorney  granted  under the  Special  Power of Attorney
         executed pursuant to Subparagraph 5(b) herein, other than actions taken
         or  omitted  to be  taken  through  the  gross  negligence  or  willful
         misconduct of such Indemnitees.

                  (e)  Grantor  agrees  to  cause  Lender  to  be  named  as  an
         additional  insured  with  respect to any policy of  insurance  held by
         Grantor from time to time covering  product  liability or  intellectual
         property infringement risk.

         10. Miscellaneous.

                  (a) Notices. Except as otherwise provided herein, all notices,
         requests,  demands or other communications to or upon Lender or Grantor
         hereunder  shall be  addressed  to Lender or Grantor at the  respective
         addresses indicated below or at such other address as Lender or Grantor
         may designate by written notice to the other party, and shall be deemed
         to have been given (i) in the case of notice by letter,  three (3) days
         after deposited in the mails  registered and return receipt  requested,
         or (ii) in the case of  notice  given by  telecommunication,  when sent
         with appropriate confirmation received:

                      Lender:         Sanwa Business Credit Corporation
                                      550 N. Brand Boulevard
                                      Suite 950
                                      Glendale, California 91203
                                      Attention:  Regional Manager
                                      Telephone:  (818) 545-0090
                                      Telecopy:   (818) 545-0095


                                      - 9 -

<PAGE>

                      Grantor:         3-D Geophysical, Inc.
                                       8226 Park Meadows Drive
                                       Littleton, Colorado  80124
                                       Attention:  Ronald L. Koons
                                       Telephone:
                                       Telecopy:


                      with a copy to:  Rothgerber, Appel, Powers & Johnson, LLP
                                       Norwest Bank Tower
                                       90 S. Cascade Ave., Suite 1100
                                       Colorado Springs, CO  80903
                                       Attention:   Bruce Warren, Esq.
                                       Telephone:
                                       Telecopy:

                  (b)  Nonwaiver.  No  failure  or  delay  on  Lender's  part in
         exercising any right  hereunder shall operate as a waiver thereof or of
         any other  right nor shall any single or partial  exercise  of any such
         right  preclude  any other  further  exercise  thereof  or of any other
         right.

                  (c) Amendments  and Waivers.  Except with respect to action by
         Lender pursuant to Subparagraph  4(d), this Security  Agreement may not
         be amended or modified,  nor may any of its terms be waived,  except by
         written  instruments  signed by Grantor  and Lender as  required by the
         Guaranty.  Each waiver or consent under any  provision  hereof shall be
         effective only in the specific  instances and for the purpose for which
         given.

                  (d) Assignments. This Security Agreement shall be binding upon
         and inure to the  benefit of Lender and  Grantor  and their  respective
         successors and assigns; provided,  however, that Grantor and Lender may
         sell,  assign and  delegate  their  respective  rights and  obligations
         hereunder only as permitted by the Guaranty.

                  (e) Cumulative Rights, etc. The rights, powers and remedies of
         Lender  under  this  Security  Agreement  shall be in  addition  to all
         rights, powers and remedies given to Lender by virtue of any applicable
         law, rule or regulation of any governmental authority,  the Guaranty or
         any other agreement, all of which rights, powers, and remedies shall be
         cumulative and may be exercised  successively or  concurrently  without
         impairing  Lender's  rights  hereunder.  Grantor  waives  any  right to
         require  Lender  to  proceed  against  any  Person  or to  exhaust  any
         Collateral or to pursue any remedy in Lender's power.


                                     - 10 -


<PAGE>

                  (f) Payments Free of Taxes,  Etc. All payments made by Grantor
         under this Security  Agreement  shall be made by Grantor free and clear
         of and without  deduction  for any and all  present  and future  taxes,
         levies,  charges,  deductions and  withholdings.  In addition,  Grantor
         shall pay upon  demand any stamp or other  taxes,  levies or charges of
         any jurisdiction with respect to the execution, delivery, registration,
         performance and enforcement of this Security Agreement. Upon request by
         Lender,  Grantor shall furnish evidence satisfactory to Lender that all
         requisite  authorizations  and approvals by, and notices to and filings
         with, governmental authorities and regulatory bodies have been obtained
         and made and that all  requisite  taxes,  levies and charges  have been
         paid.

                  (g) Partial  Invalidity.  If at any time any provision of this
         Security  Agreement is or becomes illegal,  invalid or unenforceable in
         any respect  under the law of any  jurisdiction,  neither the legality,
         validity or enforceability of the remaining provisions of this Security
         Agreement  nor  the  legality,   validity  or  enforceability  of  such
         provision under the law of any other  jurisdiction  shall in any way be
         affected or impaired thereby.

                  (h) Governing Law. This Security  Agreement  shall be governed
         by and construed in accordance with the laws of the State of California
         without reference to conflicts of law rules.

                  (i) Submission to Jurisdiction. Grantor hereby irrevocably and
         unconditionally:

                           (i) Submits for itself and its  property in any legal
                  action or proceeding relating to this Security  Agreement,  or
                  for  recognition  and  enforcement  of any judgment in respect
                  thereof,  to the  non-exclusive  jurisdiction  of  the  courts
                  located in Los Angeles,  and consents and agrees to suit being
                  brought in such courts as Lender may elect;

                           (ii)  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  proceeding  was  brought in an
                  inconvenient court and agrees not to plead or claim the same;

                           (iii)  Agrees as an  alternate  means of  service  of
                  process in any such legal action or  proceeding  to service by
                  mailing of copies thereof (by registered or certified mail, if
                  practicable)  postage  prepaid,  or by  telecopy,  to the then
                  active  agent  or to  Grantor  at its  address  set  forth  in
                  Subparagraph  10(a)  hereof or at such other  address of which
                  Lender shall have


                                     - 11 -


<PAGE>

                  been  notified  pursuant  thereto,  and agrees that failure to
                  receive  such copy or notice  shall not  affect or impair  the
                  validity of such  service or of any  judgment  rendered in any
                  action or proceeding based thereon; and

                           (iv) Agrees that nothing herein shall affect Lender's
                  right  to  effect  service  of  process  in any  other  manner
                  permitted  by law,  and that  Lender  shall  have the right to
                  bring  any  legal  proceedings  (including  a  proceeding  for
                  enforcement of a judgment entered by any of the aforementioned
                  courts) against Guarantor in such courts or in any other court
                  or jurisdiction in accordance with applicable law.

                  (j) Jury Trial.  EACH OF GRANTOR  AND  LENDER,  TO THE FULLEST
         EXTENT PERMITTED BY APPLICABLE LAW, HEREBY IRREVOCABLY WAIVES ALL RIGHT
         TO  TRIAL  BY JURY  AS TO ANY  ISSUE  RELATING  HERETO  IN ANY  ACTION,
         PROCEEDING,  OR  COUNTERCLAIM  ARISING  OUT  OF  OR  RELATING  TO  THIS
         AGREEMENT.


                                     - 12 -

<PAGE>

         IN WITNESS  WHEREOF,  Grantor  and Lender  have  caused  this  Security
Agreement to be executed as of the day and year first above written.

                             "GRANTOR"

                             3-D GEOPHYSICAL, INC.,
                             a Delaware corporation,



                             By: /s/ Ronald L. Koons
                                -------------------------------------
                                Name:  Ronald L. Koons
                                Title: Vice President



                             "LENDER"

                             SANWA BUSINESS CREDIT CORPORATION,
                             a Delaware corporation



                             By:     /s/ Timothy K. Turner
                                -------------------------------------
                                Name:    Timothy K. Turner
                                Title:   First Vice President


                                     - 13 -


<PAGE>

                                  ATTACHMENT I
                         TO TRADEMARK SECURITY AGREEMENT


         (a) All trademarks,  trade names,  trade styles and service marks,  and
all prints and labels on which said  trademarks,  trade names,  trade styles and
service marks have appeared or appear,  and all designs and general  intangibles
of like nature, now existing or hereafter adopted or acquired,  all right, title
and interest  therein and thereto,  all  registrations  and recordings  thereof,
including without limitation, (i) all applications, registrations and recordings
in the Patent and  Trademark  Office or in any  similar  office or agency of the
United  States,  any State  thereof,  or any  foreign  country or any  political
subdivision  thereof,  all whether now owned or  hereafter  acquired by Grantor,
including,  but not limited to,  those  described  in  Schedules A and B to this
Attachment I, which Schedules A and B are incorporated herein by this reference,
and (ii) all reissues,  extensions or renewals  thereof and all licenses thereof
(collectively, the "Trademarks");

         (b) All goodwill of Grantor's business symbolized by the Trademarks and
all customer lists and other records of Grantor  relating to the distribution of
products or provision of services bearing or covered by the Trademarks;

         (c) All claims by  Grantor  against  any  Person  for past,  present or
future infringement of the Trademarks,  including, without limitation, the right
to take any action to enforce such claims;

         (d) All  proceeds  of the  foregoing  (including,  without  limitation,
whatever  is  receivable  or received  when  Collateral  or  proceeds  are sold,
collected,   exchanged,   licensed  or  otherwise   disposed  of,  whether  such
disposition is voluntary or involuntary,  including, without limitation,  rights
to payment and return  premiums and  insurance  proceeds  under  insurance  with
respect to any  Collateral,  and all rights to payment with respect to any cause
of action affecting or relating to the Collateral).


                                 I-A

<PAGE>

                                            SCHEDULE A TO ATTACHMENT I
                                          TO TRADEMARK SECURITY AGREEMENT

                                                    TRADEMARKS


   Trademark         Jurisdiction         Reg. Date             Reg. No.
   ---------         ------------         ---------             --------

None.


<PAGE>



                           SCHEDULE B TO ATTACHMENT I
                         TO TRADEMARK SECURITY AGREEMENT

                           APPLICATIONS FOR TRADEMARKS

       Trademark         Jurisdiction        Date Filed           Serial No.
       ---------         ------------        ----------           ----------
    3-D Geophysical          U.S.              10/8/96            75-179,174


<PAGE>



                           SCHEDULE C TO ATTACHMENT I
                         TO TRADEMARK SECURITY AGREEMENT

                  LICENSES GRANTED BY GRANTOR TO THIRD PARTIES

None


<PAGE>

                           SCHEDULE D TO ATTACHMENT I
                         TO TRADEMARK SECURITY AGREEMENT

                  LICENSES GRANTED BY THIRD PARTIES TO GRANTOR

None


<PAGE>

                  ATTACHMENT II TO TRADEMARK SECURITY AGREEMENT


                           GRANT OF SECURITY INTEREST

                                   TRADEMARKS

                  THIS GRANT OF  SECURITY  INTEREST,  dated as of  November  17,
1997, is executed by 3-D Geophysical,  Inc., a Delaware corporation ("Grantor"),
in  favor  of  Sanwa  Business  Credit  Corporation,   a  Delaware   corporation
("Lender").

                  A.  Grantor  has  executed  in favor of Lender a guaranty  and
certain  related  documents  dated as of November  17, 1997  (collectively,  the
"Guaranty") in connection  with loans made by Lender to Northern  Geophysical of
America, Inc.;

                  B. Grantor has adopted,  used and is using certain trademarks,
more  particularly  described  on Schedules  1-A and 1-B annexed  hereto as part
hereof,  which  trademarks  are  registered  or  subject to an  application  for
registration in the United States Patent and Trademark Office (collectively, the
"Trademarks");

                  C.  Grantor has entered  into a Trademark  Security  Agreement
dated the date hereof (the "Security Agreement") in favor of Lender; and

                  D. Pursuant to the Security Agreement,  Grantor has granted to
Lender a security interest in all right, title and interest of Grantor in and to
the  Trademarks,  together  with the goodwill of the business  symbolized by the
Trademarks and the customer lists and records  related to the Trademarks and the
applications and registrations  thereof,  and all proceeds  thereof,  including,
without  limitation,  any and all causes of action  which may exist by reason of
infringement   thereof  (the  "Collateral"),   to  secure  the  prompt  payment,
performance  and  observance  of the  Obligations,  as defined  in the  Security
Agreement;

                  NOW, THEREFORE,  for good and valuable consideration,  receipt
of which is hereby  acknowledged,  Grantor does hereby further grant to Lender a
security  interest in the Collateral to secure the prompt  payment,  performance
and observance of the Obligations.


<PAGE>

                  Grantor does hereby  further  acknowledge  and affirm that the
rights and  remedies  of Lender  with  respect to the  security  interest in the
Collateral  granted  hereby are more fully set forth in the Security  Agreement,
the terms and provisions of which are hereby incorporated herein by reference as
if fully set forth herein.

Lender's address is:    Sanwa Business Credit Corporation
                        550 N. Brand Boulevard
                        Suite 950
                        Glendale, California  91203
                        Attention:  Regional Manager
                        Telephone:  (818) 545-0090
                        Telecopy:    (818) 545-0095

                  IN WITNESS WHEREOF,  Grantor has caused this Grant of Security
Interest to be executed as of the day and year first above written.

                             "GRANTOR"

                             3-D GEOPHYSICAL, INC.,
                             a Delaware corporation,



                             By: /s/ Ronald L. Koons
                                ----------------------
                                Name:  Ronald L. Koons
                                Title: Vice President


                                 II-2

<PAGE>

CALIFORNIA ALL-PURPOSE ACKNOWLEDGMENT
- -------------------------------------------------------------------------------

STATE OF CALIFORNIA                 )
         )  ss.
         )

On                     , before me,                                           ,
                                            (Name And Title Of Officer)
personally appeared
                                                                              ,


                  personally known to me
                  -OR-
                  proved to me on the basis of  satisfactory  evidence to be the
                  person(s)  whose  name(s)  is/are  subscribed  to  the  within
                  instrument and  acknowledged to me that  he/she/they  executed
                  the same in his/her/their authorized  capacity(ies),  and that
                  by his/her/their signature(s) on the instrument the person(s),
                  or the  entity  upon  behalf  of which  the  person(s)  acted,
                  executed the instrument.

                                             WITNESS my hand and official seal.



                                             Signature Of Notary

- -------------------------------------------------------------------------------
OPTIONAL

Though the data below is not  required by law, it may prove  valuable to persons
relying on the document and could prevent fraudulent reattachment of this form.


CAPACITY CLAIMED BY SIGNER                 DESCRIPTION OF ATTACHED DOCUMENT
     Individual
     Corporate Officer


                      Title(s)                  Title Or Type Of Document
     Partner(s)                  Limited
                                 General
     Attorney-In-Fact
     Trustee(s)
     Guardian/Conservator                            Number Of Pages
     Other:


Signer is representing:
Name Of Person(s) Or Entity(ies)                    Date Of Document




                                            Signer(s) Other Than Named Above

- -------------------------------------------------------------------------------

<PAGE>

                   SCHEDULE 1-A TO GRANT OF SECURITY INTEREST

                                   TRADEMARKS


    Mark               Registration Date                       Registration No.
    ----               -----------------                       ----------------

None.


<PAGE>

                   SCHEDULE 1-B TO GRANT OF SECURITY INTEREST

                             TRADEMARK APPLICATIONS


          Mark                 Application Date             Application No.
          ----                 ----------------             ---------------
    3-D Geophysical                10/8/96                     75-179,174


<PAGE>

                 ATTACHMENT III TO TRADEMARK SECURITY AGREEMENT


                            SPECIAL POWER OF ATTORNEY

STATE OF CALIFORNIA         )
                            )  ss.:
COUNTY OF LOS ANGELES       )


                  KNOW ALL  PERSONS  BY THESE  PRESENTS,  THAT 3-D  Geophysical,
Inc.,  a Delaware  corporation  ("Grantor"),  pursuant to a  Trademark  Security
Agreement,  dated as of November  17, 1997 (the  "Security  Agreement"),  by and
between Grantor and Sanwa Business Credit  Corporation,  a Delaware  corporation
("Lender"), hereby appoints and constitutes Lender its true and lawful attorney,
with full power of  substitution,  and with full power and  authority to perform
the following acts on behalf of Grantor:

                  1.  For  the  purpose  of  assigning,  selling,  licensing  or
otherwise  disposing  of all right,  title and interest of Grantor in and to any
trademarks,  trade names, trade styles and service marks, and all registrations,
recordings,   reissues,   extensions  and  renewals  thereof,  and  all  pending
applications  therefor,  and for the purpose of the recording,  registering  and
filing of, or accomplishing  any other formality with respect to, the foregoing,
to  execute  and  deliver  any and all  agreements,  documents,  instruments  of
assignment or other papers necessary or advisable to effect such purpose.

                  2. For the  purpose  of  evidencing  and  perfecting  Lender's
interest in any trademark not previously  assigned to Lender as security,  or in
any trademark which Grantor may acquire from a third party,  and for the purpose
of the  recording,  registering  and  filing  of,  or  accomplishing  any  other
formality  with  respect to, the  foregoing,  to execute and deliver any and all
agreements,  documents,  instruments of assignment or other papers  necessary or
advisable to effect such purpose.

                  3. To execute any and all documents, statements,  certificates
or other papers necessary or advisable in order to obtain the purposes described
above as Lender may in its sole discretion determine.


<PAGE>

                  This  power  of  attorney  is made  pursuant  to the  Security
Agreement  and  takes  effect  solely  for  the  purposes  of  Paragraph  2  and
Subparagraphs 5(a) and 7(a) thereof and is subject to the conditions thereof and
may not be revoked until the payment in full of all  "Obligations" as defined in
the Security Agreement.

Dated:  November 17, 1997

                             "GRANTOR"


                             3-D GEOPHYSICAL, INC.,
                             a Delaware corporation,



                              By:  /s/ Ronald L. Koons
                                 ----------------------
                                 Name:  Ronald L. Koons
                                 Title: Vice President


                                      III-2


<PAGE>

CALIFORNIA ALL-PURPOSE ACKNOWLEDGMENT
- -------------------------------------------------------------------------------

STATE OF CALIFORNIA      )
         )  ss.
         )

On                           , before me,                                     ,
                                             (Name And Title Of Officer)
personally appeared
                                                                              ,


                  personally known to me
                  -OR-
                  proved to me on the basis of  satisfactory  evidence to be the
                  person(s)  whose  name(s)  is/are  subscribed  to  the  within
                  instrument and  acknowledged to me that  he/she/they  executed
                  the same in his/her/their authorized  capacity(ies),  and that
                  by his/her/their signature(s) on the instrument the person(s),
                  or the  entity  upon  behalf  of which  the  person(s)  acted,
                  executed the instrument.

                                             WITNESS my hand and official seal.



                                             Signature Of Notary

- -------------------------------------------------------------------------------
OPTIONAL

Though the data below is not  required by law, it may prove  valuable to persons
relying on the document and could prevent fraudulent reattachment of this form.


CAPACITY CLAIMED BY SIGNER                DESCRIPTION OF ATTACHED DOCUMENT
     Individual
     Corporate Officer


                      Title(s)              Title Or Type Of Document
     Partner(s)                Limited
                               General
     Attorney-In-Fact
     Trustee(s)
     Guardian/Conservator                        Number Of Pages
     Other:


Signer is representing:
Name Of Person(s) Or Entity(ies)                Date Of Document




                                            Signer(s) Other Than Named Above

- -------------------------------------------------------------------------------



                                PLEDGE AGREEMENT

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

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

                                 AND

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

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

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

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

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

         1. Pledge of Collateral and Delivery of Pledged Collateral.

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

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


<PAGE>

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

         2. Collateral. The Collateral consists of the following:

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

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

              2.3 All proceeds of all of the foregoing.

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

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

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


                                       -2-

<PAGE>

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

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

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

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

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

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

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

              5.1 Preserve and protect the Collateral;

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

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

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


                                       -3-

<PAGE>

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

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

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

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

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

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

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

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

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

         6. Authorized Action by Pledgee.

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

                  6.1.1 collect by legal proceedings or otherwise and endorse,


                                       -4-

<PAGE>

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

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

                  6.1.3 protect and preserve the Collateral;

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

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

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

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

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

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

                                                      -5-





<PAGE>



         7. Transfer, Voting, Dividends, Etc.

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

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

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

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

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

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

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

         8. Default and Remedies.

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

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


                                       -6-

<PAGE>

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

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

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

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

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

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

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

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


                                       -7-

<PAGE>

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

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

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

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

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

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

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

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


                                       -8-

<PAGE>



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

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

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

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

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

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


                                       -9-

<PAGE>

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

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

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


                                      -10-

<PAGE>

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

         EXECUTED as of November 17, 1997.

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


                                      -11-

<PAGE>

                                   SCHEDULE I

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

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

    3-D Geophysical, Inc.




                                PLEDGE AGREEMENT

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

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

                                     AND

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

         WHEREAS, 3-D Geophysical, Inc., a Delaware corporation ("Pledgor") owns
one hundred percent (100%) of the issued and outstanding shares of capital stock
of 3-D Geophysical of Canada, Inc., an Alberta, Canada company (the "Company");

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

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

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

         1. Pledge of Collateral and Delivery of Pledged Collateral.

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

              1.2 All certificates or instruments representing or evidencing the
Collateral  shall be delivered  to and held by or on behalf of Pledgee  pursuant
hereto and shall be in  suitable  form for  transfer  by  delivery,  or shall be
accompanied by duly executed


<PAGE>

instruments  of  transfer  or  assignment  in blank,  all in form and  substance
satisfactory  to Pledgee.  Pledgee shall have the right,  at any time,  after an
Event of Default (as defined herein),  in its reasonable  discretion and without
notice to  Pledgor,  to transfer to or to register in the name of Pledgee or any
of its nominees any or all of the  Collateral.  In addition,  Pledgee shall have
the right at any time to exchange  certificates  or instruments  representing or
evidencing  Collateral  for  certificates  or  instruments  of smaller or larger
denominations. Pledgee shall promptly take all steps necessary under the laws of
Canada to legally perfect the interest of Pledgee created hereby.

         2. Collateral. The Collateral consists of the following:

              2.1  Sixty-five  percent  (65%) in the  aggregate of the shares of
common stock of the Company,  all such stock owned beneficially and of record by
Pledgor and listed on Schedule I attached hereto and made a part hereof, and all
cash, dividends, other securities, instruments, rights and other property at any
time and from time to time  received  or  receivable  in  respect  thereof or in
exchange  for all or any  part  thereof,  including  without  limitation,  stock
dividends,  warrants,  rights  to  subscribe,   conversion  rights,  liquidating
dividends and other stock rights,  and in the event Pledgor  receives any of the
foregoing,  Pledgor  acknowledges  that the same shall be  received IN TRUST for
Pledgee and agrees  immediately  to deliver the same to Pledgee in original form
of receipt, together with any stock or bond powers, assignments, endorsements or
other  documents or instruments as Pledgee may reasonably  request to establish,
protect or perfect Pledgee's interest in respect of such Collateral; and

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

              2.3 All proceeds of all of the foregoing.

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


                                      - 2 -

<PAGE>

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

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

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

              4.3 All shares of stock constituting Collateral (a) have been duly
and validly issued in compliance  with all applicable  laws, (b) are fully paid,
nonassessable  and  free  of  preemptive  rights,  (c) are  not  subject  to any
restrictions  upon the voting rights or upon the transfer  thereof other than as
may appear on the face of the certificates  evidencing such Collateral,  and (d)
include not less than 65% of the issued and outstanding  shares of each class of
voting stock of the Company;

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

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

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

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

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

              5.1 Preserve and protect the Collateral;

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

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


                                      - 3 -

<PAGE>

Collateral;

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

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

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

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

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

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

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

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

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


                                      - 4 -

<PAGE>

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

         6. Authorized Action by Pledgee.

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

                  6.1.1 collect by legal  proceedings  or otherwise and endorse,
receive and receipt for all  payments,  proceeds and other sums and property now
or  hereafter  payable on or in respect of proceeds  and other sums and property
now or hereafter payable on or in respect of the Collateral, including dividends
and interest payments;

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

                  6.1.3 protect and preserve the Collateral;

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

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

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

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


                                      - 5 -

<PAGE>

prior  party or any other  person in  connection  with the  Obligations  or with
respect to the Collateral.

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

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

         7. Transfer, Voting, Dividends, Etc.

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

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

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

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

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

                  7.2.1  Pledgee,  or its  nominee or  nominees,  shall,  at its
option  (after  notice to Pledgor of Pledgee's  intent to exercise such rights),
have the sole and exclusive  right to exercise all voting  powers  pertaining to
the shares of stock constituting


                                      - 6 -

<PAGE>

Collateral,  and shall exercise such powers in such manner as Pledgee may elect,
and Pledgor hereby grants Pledgee an irrevocable proxy, coupled with an interest
to vote such shares of stock; provided, however, that such proxy shall terminate
upon termination of Pledgee's security interest therein; and

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

         8. Default and Remedies.

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

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

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

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

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

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

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

                  8.2.3 to sell or otherwise  dispose of the Collateral,  or any
part  thereof,  either at public  or  private  sale,  on any  broker's  board or
securities exchange, in lots or in bulk, for cash, on credit or otherwise,  with
or without representations or warranties,


                                      - 7 -

<PAGE>

and upon such terms as shall be acceptable to Pledgee.

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

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

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

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

         10. Cumulative Rights. The rights, powers and remedies of Pledgee under


                                      - 8 -

<PAGE>

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

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

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

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

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

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

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


                                      - 9 -

<PAGE>

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

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

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

         20. Jury Trial. PLEDGOR AND PLEDGEE WAIVE THE RIGHT TO TRIAL BY JURY IN
ANY ACTION,  SUIT,  PROCEEDING  OR  COUNTERCLAIM  OF ANY KIND  ARISING OUT OF OR
RELATED TO ANY OF THE OBLIGATIONS HEREIN.

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

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


                                     - 10 -

<PAGE>

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

         EXECUTED as of November 17, 1997.

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


                                     - 11 -

<PAGE>

                                   SCHEDULE I

Class of Stock                                                No. of Shares

1.  Common Stock of 3-D Geophysical of
    Canada, Inc. registered in the name of
    3-D Geophysical, Inc.




                                PLEDGE AGREEMENT

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

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

                                       AND

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

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

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

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

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

         1. Pledge of Collateral and Delivery of Pledged Collateral.

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

              1.2 All certificates or instruments representing or evidencing the
Collateral  shall be delivered  to and held by or on behalf of Pledgee  pursuant
hereto and shall be in  suitable  form for  transfer  by  delivery,  or shall be
accompanied by duly executed


<PAGE>

instruments  of  transfer  or  assignment  in blank,  all in form and  substance
satisfactory  to Pledgee.  Pledgee shall have the right,  at any time,  after an
Event of Default (as defined herein),  in its reasonable  discretion and without
notice to  Pledgor,  to transfer to or to register in the name of Pledgee or any
of its nominees any or all of the  Collateral.  In addition,  Pledgee shall have
the right at any time to exchange  certificates  or instruments  representing or
evidencing  Collateral  for  certificates  or  instruments  of smaller or larger
denominations. Pledgee shall promptly take all steps necessary under the laws of
the Cayman Islands to legally  perfect the interest of Pledgee  created  hereby,
including  the  registering  of Pledgee as the holder of the  Collateral  in the
Register of Members of the Company.

         2. Collateral. The Collateral consists of the following:

              2.1  Sixty-five  percent  (65%) in the  aggregate of the shares of
common stock of the Company,  all such stock owned beneficially and of record by
Pledgor and listed on Schedule I attached hereto and made a part hereof, and all
cash, dividends, other securities, instruments, rights and other property at any
time and from time to time  received  or  receivable  in  respect  thereof or in
exchange  for all or any  part  thereof,  including  without  limitation,  stock
dividends,  warrants,  rights  to  subscribe,   conversion  rights,  liquidating
dividends and other stock rights,  and in the event Pledgor  receives any of the
foregoing,  Pledgor  acknowledges  that the same shall be  received IN TRUST for
Pledgee and agrees  immediately  to deliver the same to Pledgee in original form
of receipt, together with any stock or bond powers, assignments, endorsements or
other  documents or instruments as Pledgee may reasonably  request to establish,
protect or perfect Pledgee's interest in respect of such Collateral; and

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

              2.3 All proceeds of all of the foregoing.

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


                                      - 2 -

<PAGE>

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

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

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

              4.3 All shares of stock constituting Collateral (a) have been duly
and validly issued in compliance  with all applicable  laws, (b) are fully paid,
nonassessable  and  free  of  preemptive  rights,  (c) are  not  subject  to any
restrictions  upon the voting rights or upon the transfer  thereof other than as
may appear on the face of the certificates  evidencing such Collateral,  and (d)
include not less than 65% of the issued and outstanding  shares of each class of
voting stock of the Company;

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

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

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

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

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

              5.1 Preserve and protect the Collateral;

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

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


                                      - 3 -

<PAGE>

Collateral;

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

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

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

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

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

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

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

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

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


                                      - 4 -

<PAGE>

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

         6. Authorized Action by Pledgee.

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

                  6.1.1 collect by legal  proceedings  or otherwise and endorse,
receive and receipt for all  payments,  proceeds and other sums and property now
or  hereafter  payable on or in respect of proceeds  and other sums and property
now or hereafter payable on or in respect of the Collateral, including dividends
and interest payments;

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

                  6.1.3 protect and preserve the Collateral;

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

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

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

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


                                      - 5 -

<PAGE>

prior  party or any other  person in  connection  with the  Obligations  or with
respect to the Collateral.

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

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

         7. Transfer, Voting, Dividends, Etc.

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

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

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

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

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

                  7.2.1  Pledgee,  or its  nominee or  nominees,  shall,  at its
option  (after  notice to Pledgor of Pledgee's  intent to exercise such rights),
have the sole and exclusive  right to exercise all voting  powers  pertaining to
the shares of stock constituting


                                      - 6 -

<PAGE>

Collateral,  and shall exercise such powers in such manner as Pledgee may elect,
and Pledgor hereby grants Pledgee an irrevocable proxy, coupled with an interest
to vote such shares of stock; provided, however, that such proxy shall terminate
upon termination of Pledgee's security interest therein; and

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

         8. Default and Remedies.

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

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

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

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

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

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

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

                  8.2.3 to sell or otherwise  dispose of the Collateral,  or any
part  thereof,  either at public  or  private  sale,  on any  broker's  board or
securities exchange, in lots or in bulk, for cash, on credit or otherwise,  with
or without representations or warranties,


                                      - 7 -

<PAGE>

and upon such terms as shall be acceptable to Pledgee.

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

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

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

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

         10. Cumulative Rights. The rights, powers and remedies of Pledgee under


                                      - 8 -

<PAGE>

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

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

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

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

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

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

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


                                      - 9 -

<PAGE>

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

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

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

         20. Jury Trial. PLEDGOR AND PLEDGEE WAIVE THE RIGHT TO TRIAL BY JURY IN
ANY ACTION,  SUIT,  PROCEEDING  OR  COUNTERCLAIM  OF ANY KIND  ARISING OUT OF OR
RELATED TO ANY OF THE OBLIGATIONS HEREIN.

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

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


                                     - 10 -

<PAGE>

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

         EXECUTED as of November 17, 1997.

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


                                     - 11 -

<PAGE>

                                   SCHEDULE I

Class of Stock                                                 No. of Shares

1.  Common Stock of 3-D Geophysical of
    Latin America, Inc. registered in the name
    of
    3-D Geophysical, Inc.



                                PLEDGE AGREEMENT



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

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

                                  AND

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

         WHEREAS, 3-D Geophysical, Inc., a Delaware corporation ("Pledgor") owns
ninety-nine  percent (99%) of the issued and outstanding shares of capital stock
of (i) Geoevaluaciones,  S.A. de C.V., and (ii) Procesos Interactivos Avanzados,
S.A. de C.V. (collectively, the "Companies");

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

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

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

         1. Pledge of Collateral and Delivery of Pledged Collateral.

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

                  1.2 Pledgor  hereby  delivers to Pledgee all  certificates  or
instruments   representing  or  evidencing  the  Collateral  duly  endorsed  "en
garantia,"  together with a certified copy of the stock registry book of each of
the Companies evidencing the registration of this pledge therein.  Pledgee shall
have the right, at any time, after an Event of Default (as defined  herein),  in
its reasonable  discretion  and without notice to Pledgor,  to transfer to or to
register  in the  name  of  Pledgee  or any  of its  nominees  any or all of the
Collateral. In


<PAGE>

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

         2. Collateral. The Collateral consists of the following:

                  2.1 Sixty-five percent (65%) in the aggregate of the shares of
common stock of the Companies,  all such stock owned  beneficially and of record
by Pledgor and listed on Schedule I attached hereto and made a part hereof,  and
all cash, dividends, other securities, instruments, rights and other property at
any time and from time to time received or  receivable in respect  thereof or in
exchange  for all or any  part  thereof,  including  without  limitation,  stock
dividends,  warrants,  rights  to  subscribe,   conversion  rights,  liquidating
dividends and other stock rights,  and in the event Pledgor  receives any of the
foregoing,  Pledgor  acknowledges  that the same shall be  received IN TRUST for
Pledgee and agrees  immediately  to deliver the same to Pledgee in original form
of receipt, together with any stock or bond powers, assignments, endorsements or
other  documents or instruments as Pledgee may reasonably  request to establish,
protect or perfect Pledgee's interest in respect of such Collateral; and

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

                  2.3 All proceeds of all of the foregoing.

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

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

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


                                      - 2 -


<PAGE>

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

                  4.3 All shares of stock constituting  Collateral (a) have been
duly and validly issued in compliance  with all  applicable  laws, (b) are fully
paid,  nonassessable  (liberadas)  and free of  preemptive  rights,  (c) are not
subject to any restrictions  upon the voting rights or upon the transfer thereof
other  than as may  appear  on the  face  of the  certificates  evidencing  such
Collateral,  and (d)  include  not less than 65% of the issued  and  outstanding
shares of each class of voting stock of each of the Companies;

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

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

                  4.6 Upon  delivery to Pledgee of the  certificates  evidencing
the  Collateral,  endorsed "en garantia" and the  registration of this pledge in
the registry books of the Companies,  the security  interest created herein will
constitute a valid, perfected first priority security interest in the Collateral
enforceable  in  accordance  with its terms against all creditors of Pledgor and
any person purporting to purchase any Collateral from Pledgor.

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

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

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

                  5.1 Preserve and protect the  Collateral as a first  priority,
perfected security interest;

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

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

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


                                      - 3 -


<PAGE>

indirectly)  thereof, any and all additional shares of stock or other securities
of the Companies;

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

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

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

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

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

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

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

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

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

         6. Authorized Action by Pledgee.

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


                                      - 4 -


<PAGE>

                           6.1.1 collect by legal  proceedings  or otherwise and
endorse,  receive  and  receipt for all  payments,  proceeds  and other sums and
property  now or  hereafter  payable on or in respect of proceeds and other sums
and  property  now or  hereafter  payable on or in  respect  of the  Collateral,
including dividends and interest payments;

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

                           6.1.3 protect and preserve the Collateral;

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

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

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

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

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

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


                                      - 5 -


<PAGE>

         7. Transfer, Voting, Dividends, Etc.

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

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

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

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

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

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

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

         8. Default and Remedies.

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

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

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


                                      - 6 -


<PAGE>

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

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

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

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

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

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

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


                                      - 7 -


<PAGE>

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

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

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

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

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

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

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

         15.  Substituted   Collateral;   Additional  Collateral.   Pledgor  may
substitute  Collateral under this Pledge Agreement  provided that any Collateral
proposed  for   substitution  is  satisfactory  to  Pledgee  in  Pledgee's  sole
discretion.  As  of  the  date  of  delivery  of  any  Collateral  approved  for
substitution  by Pledgee  pursuant to this Section 15 or  otherwise  approved as
additional  security pursuant to this Pledge Agreement,  Pledgor  represents and
warrants to Pledgee  that (1) Pledgor  will own such  shares,  certificates  and
instruments  free and clear of any right of any other person or entity,  and (2)
Pledgor  will have good and  marketable  title to the shares,  certificates  and
instruments and have the right to pledge such


                                      - 8 -


<PAGE>

shares,  certificates  or  instruments  pursuant  to this Pledge  Agreement.  By
delivery  of such  substituted  or  additional  Collateral,  Pledgor  shall have
represented  and warranted that Pledgee has a valid,  perfected,  first priority
security interest in such shares,  certificates and instruments and the proceeds
thereof  free  and  clear of all  liens,  claims  and  rights  of third  parties
whatsoever.  All  documentary,  stamp or other taxes or fees owing in connection
with the issuance,  transfer  and/or pledge of the Collateral or any substituted
or additional Collateral have been paid and will hereafter be paid by Pledgor as
such become due and payable.

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

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

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

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

         20. Jury Trial. PLEDGOR AND PLEDGEE WAIVE THE RIGHT TO TRIAL BY JURY IN
ANY ACTION,  SUIT,  PROCEEDING  OR  COUNTERCLAIM  OF ANY KIND  ARISING OUT OF OR
RELATED TO ANY OF THE OBLIGATIONS HEREIN.

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

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


                                      - 9 -


<PAGE>

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

                  EXECUTED as of November 17, 1997.

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

Its:     First Vice President                         Its:    Vice President


                                     - 10 -

<PAGE>


                                                    SCHEDULE I

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

1.  Common Stock of Geoevaluaciones, S.A.                            ________
    de C.V. registered in the name of
    3-D Geophysical, Inc.

2.  Common Stock of Procesos Interactivos                            ________
    Avanzados, S.A. de C.V.




                         SECURITY AGREEMENT (SECURITIES)

                  THIS SECURITY AGREEMENT (SECURITIES) is dated for reference
November 17, 1997,

MADE BY:

                  W.G. MUELLER CONSULTING SERVICES LTD., a body
                  corporate under the laws of Alberta, having its chief place of
                  business at 220 - 99 Avenue, S.E., Calgary, Alberta, T2J 0J1

                  (the "Pledgor")

IN FAVOUR OF:

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

                  (the "Pledgee")


WHEREAS:

A. The Pledgor owns eighteen percent (18%) of the issued and outstanding  voting
shares  (the  "Shares")  of the  capital  stock of  J.R.S.  Exploration  Company
Limited, an Alberta company ("JRS") represented by the share certificates listed
in the Schedule attached hereto;

B. The Pledgee has made available to Northern  Geophysical  of America,  Inc., a
Delaware  corporation  (the  "Borrower"),  certain  loans  and  other  financial
accommodations  pursuant to a Loan and Security  Agreement  dated as of the date
hereof between Borrower and Pledgee (the "Loan Agreement");

C. In consideration for such financial accommodations,  the Borrower has given a
security  interest  in the  shares of the  shareholder  of the  Pledgor  and has
requested the Pledgor execute, among other things, this Pledge Agreement.

                  NOW THEREFORE THIS SECURITY AGREEMENT  (SECURITIES)  WITNESSES
THAT  in  consideration  of  the  premises  and  for  other  good  and  valuable
consideration  (the receipt and  sufficiency of which is hereby  acknowledged by
the Pledgor, the Pledgor hereby agrees with the Pledgee as follows:

1.  Collateral.  The Pledgor  grants to the Pledgee a  continuing,  specific and
fixed  assignment,  transfer,  mortgage,  charge and  security  interest  in the
following (hereinafter collectively, the "Collateral"):


<PAGE>

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

         (b)      Subject  to  section  8.1(b),  all  other  property  hereafter
                  delivered  to the Pledgee  (or any agent or bailee  holding on
                  behalf of the Pledgee) by the Pledgor in  substitution  for or
                  in  addition to any of the  foregoing,  all  certificates  and
                  instruments representing or evidencing such other property and
                  all cash, dividends, other securities, instruments, rights and
                  other  property at any time and from time to time  received or
                  receivable  in respect  thereof or in exchange  for all or any
                  part thereof, including without limitation, subject to section
                  8.1(b), dividends,  warrants, rights to subscribe,  conversion
                  rights,  liquidating  dividends and other share rights, and in
                  the event  the  Pledgor  receives  any of the  foregoing,  the
                  Pledgor  acknowledges that the same shall be received IN TRUST
                  for the Pledgee and agrees  immediately to deliver the same to
                  the Pledgee in original  form of  receipt,  together  with any
                  powers  of  attorney,   assignments,   endorsements  or  other
                  documents  or  instruments  as  the  Pledgee  may  request  to
                  establish,  protect  or  perfect  the  Pledgee's  interest  in
                  respect of such Collateral; and

         (c)      All proceeds of all of the foregoing.

2. Registration of Securities.  All certificates or instruments  representing or
evidencing the Collateral  shall be delivered to and held by or on behalf of the
Pledgee  pursuant  hereto and shall be duly  endorsed  in blank for  transfer or
shall be transferred into the name of the Pledgee, if the Pledgee requests.  The
Pledgee  shall have the  right,  at any time,  both  before or after an Event of
Default (as defined herein), in its reasonable  discretion and without notice to
the Pledgor,  but shall be under no obligation to, to transfer to or to register
in the name of the Pledgee or any of its nominees any or all of the  Collateral.
In  addition,  the  Pledgee  shall  have  the  right  at any  time  to  exchange
certificates   or  instruments   representing   or  evidencing   Collateral  for
certificates or instruments of small or larger denominations.  The Pledgee shall
be under no obligation to accept any  Collateral  or to cause,  or to permit,  a
transfer  thereof to be made into its name if, in the  opinion  of the  Pledgor,
such  acceptance or transfer might involve or render the Pledgor  subject to any
liability or expense unless the Pledgor be indemnified to its  satisfaction  for
so doing.


                                      - 2 -

<PAGE>

3.  Obligations.  The  Collateral  shall be held by the  Pledgee  as  continuing
security and shall secure the payment of:

         (a)      all and every  indebtedness,  present and  future,  direct and
                  indirect,  absolute  and  contingent,  of the  Borrower to the
                  Pledgee (herein called the "Indebtedness"); and

         (b)      all and  every  liability,  present  and  future,  direct  and
                  indirect,  absolute  and  contingent,  of  each of JRS and the
                  Pledgor to the  Pledgee  (herein  called the  "Liability"  and
                  collectively with the Indebtedness, the "Obligations").

4. Securities Additional Security.  The Collateral are in addition to and not in
substitution  for any other security or securities which the Pledgee now or from
time to time may  hold or take  from JRS or from any  other  person  or  persons
whomsoever.

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

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

         (b)      all  information  heretofore,  herein  or  hereafter  given to
                  Pledgee  by or on  behalf of  Pledgor  is  complete,  true and
                  correct;

         (c)      all shares  constituting the Collateral (a) have been duly and
                  validly issued in compliance  with all the laws of Alberta and
                  laws of Canada  Applicable  to  Alberta,  (b) are fully  paid,
                  nonassessable  and  free  of  preemptive  rights,  (c) are not
                  subject to any restrictions upon the voting rights or upon the
                  voting  rights or upon the transfer  thereof other than as may
                  appear  on  the  face  of  the  certificates  evidencing  such
                  Collateral,   (d)  constitute  all  securities  of  JRS  owned
                  beneficially  and of record by the Pledgor and (e) include 82%
                  of the issued and outstanding voting shares of JRS;

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

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

         (f)      the  execution,   delivery  and  performance  of  this  Pledge
                  Agreement  do not (i)  violate  any  provisions  of law or any
                  order of any  court or other  agency  of  government,  or (ii)
                  contravene any provision of any material contract or


                                      - 3 -

<PAGE>

                  agreement  to which  the  Pledgor  is a party or by which  the
                  Pledgor or the Pledgor's assets are bound.

6.  Covenants of Pledgor.  Until the  Obligations  are  satisfied  in full,  the
Pledgor agrees to:

         (a)      preserve and protect the Collateral;

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

         (c)      promptly pay and discharge  before the same become  delinquent
                  all  taxes,  assessments  and  governmental  charges or levies
                  imposed on the Pledgor or any of the Collateral;

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

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

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

         (g)      if the  Pledgee  gives  value to enable the Pledgor to acquire
                  rights in or use of any  Collateral,  use such  value only for
                  such purpose;

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

         (i)      provide the Pledgee with such other information  pertaining to
                  the Collateral as the Pledgee may reasonably request from time
                  to time;


                                      - 4 -


<PAGE>

         (j)      maintain and preserve its  corporate or other legal  existence
                  of,  including  without  limitation,   JRS,  and  all  rights,
                  privileges,  franchises and other authority  necessary for the
                  conduct of their respective businesses; and

         (k)      Continue  its  operations  in the same form and  structure  of
                  business  (i.e.,   corporate,   partnership,   individual)  as
                  currently  conducted,  and not  merge or  consolidate  with or
                  acquire or be acquired by any other corporation,  partnership,
                  entity or person, with the Pledgee's prior written consent.

7.                Authorized Action by Pledged.

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

         (a)      collect by legal proceedings or otherwise and endorse, receive
                  and  receipt  for all  payments,  proceeds  and other sums and
                  property now or hereafter payable on or in respect of proceeds
                  and other sums and property now or hereafter  payable on or in
                  respect of the  Collateral,  including  dividends and interest
                  payments;

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

         (c)      protect and preserve the Collateral;

         (d)      transfer the Collateral to its own or its nominee's name; and

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

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

7.2 The Pledgor  agrees to  reimburse  the Pledgee upon demand for any costs and
expenses,  including  legal fees,  the  Pledgee  may incur  while  acting as the
Pledgor's  lawful  attorney  hereunder,  all of which  costs  and  expenses  are
included in the  Obligations  secured hereby and are payable upon demand.  It is
further agreed and understood between the parties


                                      - 5 -


<PAGE>

hereto  that  such  care as the  Pledgee  gives  to the  safekeeping  of its own
property of like kind shall constitute reasonable care of the Collateral when in
the  Pledgee's  possession;  provided,  however,  that the Pledgee  shall not be
required to make any presentment, demand or protest, or give any notice and need
not take any action to preserve any rights  against any prior party or any other
person in connection with the Obligations or with respect to the Collateral.

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

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

8.                Transfer, Voting, Dividends, Etc.

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

         (a)      the Pledgor shall have the right,  subject to the restrictions
                  hereinafter  imposed,  to vote  all  shares  comprised  in the
                  Collateral  with the same force and effect as though  they had
                  not been delivered to the Pledgee hereunder. If the Collateral
                  shall have been  transferred  into the name of the  Pledgee or
                  its  nominee  or  nominees,  the  Pledgee,  on  request of the
                  Pledgor  shall execute and deliver or cause to be executed and
                  delivered to the Pledgor suitable proxies for voting powers in
                  favour of the  nominee or  nominees of the Pledgor for voting,
                  and otherwise facilitate the voting of any such Securities. On
                  the  security  hereby  constituted  becoming  enforceable  the
                  Pledgee may enforce the right to vote the shares  comprised in
                  the Collateral in the same manner and to the same extent as if
                  it were the absolute  owner  thereof  until the Pledgor  shall
                  again be entitled under the provisions  hereof to exercise the
                  right of voting in  respect  of the  Collateral.  The  Pledgor
                  shall not use or vote or permit to be used or voted any of the
                  Collateral  for any purpose  contrary to the  covenants of the
                  Pledgor herein  contained or otherwise  inconsistent  with the
                  provisions or purposes hereof; and

         (b)      To the extent  permitted  in the Loan  Agreement,  the Pledgor
                  shall be entitled to receive and retain all dividends  paid or
                  declared  in respect of any  Collateral  (other  than stock or
                  liquidating  dividends) and all interest  payments  payable in
                  respect of the  Collateral,  and, from time to time,  upon the
                  written  request of the Pledgor,  the Pledgee shall deliver to
                  the  Pledgor  suitable  orders in favour of the Pledgor or its
                  nominee or nominees for the payment of such dividends, and the
                  Pledgee  shall  at once  pay  over  to the  Pledgor  any  such
                  dividends  which  may  have  been  received  by it;  provided,
                  however,  that all shares or  property  representing 


                                      - 6 -


<PAGE>

                  the  shares or  liquidating  dividends  or a  distribution  or
                  return of  capital  upon or in  respect of the shares of stock
                  constituting Collateral or resulting from a split-up, revision
                  or reclassification of such Collateral or received in exchange
                  therefor, as a result of a merger, consolidation or otherwise,
                  shall be paid or transferred  directly to Pledgee  immediately
                  upon receipt thereof by Pledgor,  and shall be retained by the
                  Pledgee as Collateral hereunder.

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

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

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

9.                Default and Remedies.

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

         (a)      any Default, under and as defined in the Loan Agreement, shall
                  have occurred and be continuing; or

         (b)      any breach,  violation  or  non-performance  or any  warranty,
                  covenant or undertaking on the Pledgor's part hereunder; or

         (c)      any breach,  violation  or  non-performance  of any  warranty,
                  covenant  or  undertaking  on the part of JRS  under any other
                  agreement with the Pledgee.

9.2 Upon the occurrence of any Event of Default, the Pledgee may, at its option,
without notice to or demand on the Pledgor,  declare all Obligations immediately
due and payable,  and the Pledgee shall have the following  rights and remedies,
all of which may be exercised with or without further notice to the Pledgor,  at
the  Pledgee's  sole option and as the Pledgee in its sole  discretion  may deem
advisable:

         (a)      the Pledgee may enforce any and all security which it may hold
                  including  the  Collateral  and may deal with or realize  upon
                  such of the Collateral as it may in its sole  discretion  deem
                  fit; provided however, that the Pledgee shall not be bound


                                      - 7 -


<PAGE>

                  to deal with the  Collateral  nor exercise any right or remedy
                  thereunder  and shall not be liable  for any loss which may be
                  occasioned by any failure to do so;

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

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

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

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

10. Redemption and Stock Dividends.  Unless the Pledgee consents in writing, the
Pledgor  shall not be entitled to receive and the Pledgee  shall not pay over to
the  Pledgor  the  redemption  price,  exclusive  of accrued  dividends,  of any
Collateral, nor any stock dividends on any Collateral nor such cash dividends on
any  such  Collateral  as  may  become  payable  on  or in  the  course  of  the
dissolution,  liquidation or winding-up of any corporation and which shall be in
any way the  proceeds of or  chargeable  to or payable out of capital.  Any such
redemption  price,  stock dividends and cash dividends  chargeable to or payable
out of capital received by the Pledgor shall forthwith be paid over or delivered
to the Pledgee  without  demand.  If the Pledgee  shall have  permitted any such
Collateral  to  remain  registered  in the  name  of the  Pledgor,  the  Pledgor
covenants to furnish to the Pledgee on demand suitable orders for the payment to
the Pledgee of any such  redemption  price or cash dividends which represent the
proceeds of or are  chargeable  to or payable out of capital or for the issue in
the name of the  Pledgee or its  nominee or  nominees,  and the  delivery to the
Pledgee of any such stock dividends.

11.  Protection of Securities.  The Pledgee may, in its discretion,  protect the
property  which  underlies or is charged or affected by any of the Collateral by
instituting or joining in judicial  proceedings by the purchase at judicial sale
thereof, by joining in any reorganization of such property or of the corporation
owing the same, or in any other manner which the Pledgee may deem expedient.

12.  Duty of  Pledgee.  The  Pledgee  shall not be under any duty or  obligation
whatsoever to collect any dividends,  interest or other payments due or accruing
in  respect  of the  Collateral,  or to take any  action to  preserve  rights in
connection with any Collateral, including,


                                      - 8 -


<PAGE>

without limitation,  making or giving any presentment,  demands for performance,
notices of non-performance,  protests, notices of protest or notices of dishonor
in connection with any Collateral.

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

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

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

16. Substituted  Collateral;  Additional Collateral.  The Pledgor may substitute
Collateral under this Pledge Agreement provided that any Collateral proposed for
substitution is satisfactory to the Pledgee in the Pledgee's sole discretion. As
of the date of delivery  of any  Collateral  approved  for  substitution  by the
Pledgee pursuant to this Section 16 or otherwise approved as additional security
pursuant to this Pledge  Agreement,  the Pledgor  represents and warrants to the
Pledgee that (1) the Pledgor will own such shares,  certificates and instruments
free and clear of any right of any other  person or entity,  and (2) the Pledgor
will have good and marketable title to the shares,  certificates and instruments
and have the right to pledge such shares,  certificates or instruments  pursuant
to this  Pledge  Agreement.  By  delivery  of  such  substituted  or  additional
Collateral,  the Pledgor shall have  represented  and warranted that the Pledgee
has a  valid,  perfected,  first  priority  security  interest  in such  shares,
certificates  and  instruments  and the  proceeds  thereof free and clear of all
liens, claims and rights of third parties whatsoever. All documentary,  stamp or
other  taxes or fees owing in  connection  with the  issuance,  transfer  and/or
pledge of the Collateral or any  substituted or additional  Collateral have been
paid and will hereafter be paid by the Pledgor as such become due and payable.

17. Records.  The records of the Pledgee as to payment of the Indebtedness being
in default or of any demand for  payment  having  been made shall be prima facie
evidence of such default or demand.

18. Application of Payments. Payments made in respect of the Indebtedness or the
Liability  to the  Pledgee  from time to time and the moneys  realized  from any
securities held therefor  (including moneys realized from the enforcement of any
of the Collateral) may be applied on such part or parts of the  Indebtedness and
Liability or either of them as the Pledgee may see fit, and the Pledgee shall at
all times and from time to time have the right to change


                                      - 9 -


<PAGE>

and appropriation of any moneys received by it and re-apply the same on any part
or parts of the  Indebtedness and Liability or either of them as the Pledgee may
see fit,  notwithstanding  any previous  application by whomsoever made, and the
Pledgee may grant extensions, take and give up securities,  accept compositions,
grant releases and discharges and otherwise make  arrangements and deal with the
Pledgor and with others as the  Pledgee  may see fit  without  prejudice  to the
liability of the Pledgor to the Pledgee,  the Pledgee's claim for any deficiency
or the  Pledgee's  right to hold,  deal with and realize on the  security of the
Collateral.

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

20. Delivery of Copy/Waiver. The Pledgor hereby acknowledges receiving a copy of
this Security Agreement  (Securities).  The Pledgor waives all rights to receive
from the Pledgee a copy of any financing statement or financing change statement
registered  or  verification  statement  issued at any time in  respect  of this
Security Agreement (Securities).

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

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

23.  Entire  Agreement/Amendment.  This  Pledge  Agreement  contains  the entire
agreement  between  the  parties  hereto  with  respect to the  Collateral.  Any
amendment of this Pledge  Agreement  shall not be binding  unless in writing and
signed by the Pledgor and the Pledgee.  The Pledgor  confirms  that there are no
representation,  warranties,  covenants or acknowledgements affecting, or relied
upon in entering this Pledge Agreement.

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

25.  Severability.  Any provision of this Pledge Agreement  prohibited by law or
otherwise   ineffective  shall  be  ineffective  only  to  the  extent  of  such
prohibition or ineffectiveness


                                     - 10 -


<PAGE>

and shall be severable without invalidating or otherwise affecting the remaining
provisions hereof.

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

27.  Applicable  Law. This Pledge  Agreement  shall be construed and enforceable
under and in accordance with the laws of Alberta.

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

                  IN WITNESS WHEREOF W.G. MUELLER CONSULTING  SERVICES LTD., has
executed this Security Agreement  (Securities) by its duly authorized  signatory
under its common seal on November 17, 1997.


W.G. MUELLER CONSULTING SERVICES LTD.

                                                     C/S

By:  /s/ Donald E. Janveau
  --------------------------
     Name:  Donald E. Janveau
     Title:  President


                                - 11 -

<PAGE>

                                    SCHEDULE

                           LIST OF SHARE CERTIFICATES


6 CLASS A SHARES OF JRS EXPLORATION COMPANY LIMITED

6 CLASS B SHARES OF JRS EXPLORATION COMPANY LIMITED




                                - 12 -



SECURITY AGREEMENT (SECURITIES)



                  THIS SECURITY AGREEMENT (SECURITIES) is dated for
reference November 17, 1997,

MADE BY:

                  JAN VO  EQUITIES  LTD.,  a body  corporate  under  the laws of
                  Alberta,  having its chief place of business at 180 Rundlewood
                  CL, N.E., Calgary, Alberta, T1Y2P3,

                  (the "PLEDGOR")

IN FAVOUR OF:

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

                  (the "PLEDGEE")

WHEREAS:

A. The  Pledgor  owns  eighty-two  percent  (82%) of the issued and  outstanding
voting shares (the "SHARES") of the capital stock of J.R.S.  Exploration Company
Limited, an Alberta company ("JRS") represented by the share certificates listed
in the Schedule attached hereto;

B. The Pledgee has made available to Northern  Geophysical  of America,  Inc., a
Delaware  corporation  (the  "BORROWER"),  certain  loans  and  other  financial
accommodations  pursuant to a Loan and Security  Agreement  dated as of the date
hereof between Borrower and Pledgee (the "LOAN AGREEMENT");

C. In consideration for such financial accommodations,  the Borrower has given a
security  interest  in the  shares of the  shareholder  of the  Pledgor  and has
requested the Pledgor execute, among other things, this Pledge Agreement.

                  NOW, THEREFORE, THIS SECURITY AGREEMENT (SECURITIES) WITNESSES
THAT  in  consideration  of  the  premises  and  for  other  good  and  valuable
consideration  (the receipt and  sufficiency of which is hereby  acknowledged by
the Pledgor, the Pledgor hereby agrees with the Pledgee as follows:

1.  Collateral.  The Pledgor  grants to the Pledgee a  continuing,  specific and
fixed  assignment,  transfer,  mortgage,  charge and  security  interest  in the
following (hereinafter collectively, the "COLLATERAL"):

         (a)      All of the Shares of common stock of JRS issued or  registered
                  in the name of the Pledgor, owned


<PAGE>

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

         (b)      Subject  to  section  8.1(b),  all  other  property  hereafter
                  delivered  to the Pledgee  (or any agent or bailee  holding on
                  behalf of the Pledgee) by the Pledgor in  substitution  for or
                  in  addition to any of the  foregoing,  all  certificates  and
                  instruments representing or evidencing such other property and
                  all cash, dividends, other securities, instruments, rights and
                  other  property at any time and from time to time  received or
                  receivable  in respect  thereof or in exchange  for all or any
                  part thereof, including without limitation, subject to section
                  8.1(b), dividends,  warrants, rights to subscribe,  conversion
                  rights,  liquidating  dividends and other share rights, and in
                  the event  the  Pledgor  receives  any of the  foregoing,  the
                  Pledgor  acknowledges that the same shall be received IN TRUST
                  for the Pledgee and agrees  immediately to deliver the same to
                  the Pledgee in original  form of  receipt,  together  with any
                  powers  of  attorney,   assignments,   endorsements  or  other
                  documents  or  instruments  as  the  Pledgee  may  request  to
                  establish,  protect  or  perfect  the  Pledgee's  interest  in
                  respect of such Collateral; and

         (c)      All proceeds of all of the foregoing.

2. Registration of Securities.  All certificates or instruments  representing or
evidencing the Collateral  shall be delivered to and held by or on behalf of the
Pledgee  pursuant  hereto and shall be duly  endorsed  in blank for  transfer or
shall be transferred into the name of the Pledgee, if the Pledgee requests.  The
Pledgee  shall have the  right,  at any time,  both  before or after an Event of
Default (as defined herein), in its reasonable  discretion and without notice to
the Pledgor,  but shall be under no obligation to, transfer to or to register in
the name of the Pledgee or any of its nominees any or all of the Collateral.  In
addition, the Pledgee shall have the right at any


                                      - 2 -


<PAGE>

time  to  exchange  certificates  or  instruments   representing  or  evidencing
Collateral for  certificates or instruments of smaller or larger  denominations.
The Pledgee shall be under no  obligation to accept any  Collateral or to cause,
or to permit,  a transfer thereof to be made into its name if, in the opinion of
the Pledgor,  such  acceptance  or transfer  might involve or render the Pledgor
subject to any  liability or expense  unless the Pledgor be  indemnified  to its
satisfaction for so doing.

3.  Obligations.  The  Collateral  shall be held by the  Pledgee  as  continuing
security and shall secure the payment of:

         (a)      all and every  indebtedness,  present and  future,  direct and
                  indirect,  absolute  and  contingent,  of the  Borrower to the
                  Pledgee (herein called the "INDEBTEDNESS"); and

         (b)      all and  every  liability,  present  and  future,  direct  and
                  indirect,  absolute  and  contingent,  of  each of JRS and the
                  Pledgor to the  Pledgee  (herein  called the  "LIABILITY"  and
                  collectively with the Indebtedness, the "OBLIGATIONS").

4. Securities Additional Security.  The Collateral are in addition to and not in
substitution  for any other security or securities which the Pledgee now or from
time to time may  hold or take  from JRS or from any  other  person  or  persons
whomsoever.

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

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

         (b)      all  information  heretofore,  herein  or  hereafter  given to
                  Pledgee  by or on  behalf of  Pledgor  is  complete,  true and
                  correct;

         (c)      all shares  constituting the Collateral (a) have been duly and
                  validly issued in compliance  with all the laws of Alberta and
                  laws of Canada  applicable  to  Alberta,  (b) are fully  paid,
                  nonassessable  and  free  of  preemptive  rights,  (c) are not
                  subject to any restrictions upon the voting rights or upon the
                  transfer  thereof  other than as may appear on the face of the
                  certificates  evidencing such  Collateral,  (d) constitute all
                  securities  of JRS  owned  beneficially  and of  record by the
                  Pledgor  and (e)  include  82% of the issued  and  outstanding
                  voting shares of JRS;


                                      - 3 -


<PAGE>

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

         (e)      this Pledge  Agreement has been duly executed and delivered by
                  Pledgor and constitutes a legal, valid and binding obligations
                  of Pledgor, enforceable against Pledgor in accordance with its
                  terms; and

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

6.  Covenants of Pledgor.  Until the  Obligations  are  satisfied  in full,  the
Pledgor agrees to:

         (a)      preserve and protect the Collateral;

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

         (c)      promptly pay and discharge  before the same become  delinquent
                  all  taxes,  assessments  and  governmental  charges or levies
                  imposed on the Pledgor or any of the Collateral;

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

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

         (f)      procure or execute and deliver, from time to time, in form and
                  substance  satisfactory to the Pledgee, any powers,  powers of
                  attorney,  endorsements,  assignments,  financing  statements,
                  estoppel  certificates or other writings  deemed  necessary or
                  appropriate by the Pledgee to perfect, maintain or protect the
                  Pledgee's security interest in the Collateral and the priority
                  thereof,


                                      - 4 -


<PAGE>

                  and take such other action and deliver  such other  documents,
                  instruments and agreements pertaining to the Collateral as the
                  Pledgee  may request to  effectuate  the intent of this Pledge
                  Agreement;

         (g)      if the  Pledgee  gives  value to enable the Pledgor to acquire
                  rights in or use of any  Collateral,  use such  value only for
                  such purpose;

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

         (i)      provide the Pledgee with such other information  pertaining to
                  the Collateral as the Pledgee may reasonably request from time
                  to time;

         (j)      maintain and preserve its  corporate or other legal  existence
                  of,  including  without  limitation,   JRS,  and  all  rights,
                  privileges,  franchises, and other authority necessary for the
                  conduct of their respective businesses; and

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

7. Authorized Action by Pledgee.

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

         (a)      collect by legal proceedings or otherwise and endorse, receive
                  and  receipt  for all  payments,  proceeds  and other sums and
                  property now or hereafter payable on or in respect of proceeds
                  and other sums and property now or hereafter  payable on or in
                  respect of the  Collateral,  including  dividends and interest
                  payments;

         (b)      enter   into   any   extension,    reorganization,    deposit,
                  amalgamation  or  consolidation  agreement or other  agreement
                  pertaining to the Collateral,  and in connection therewith may
                  deposit or  surrender  control of the  Collateral  thereunder,
                  accept other property in exchange therefor, and do and perform
                  such acts and


                                      - 5 -




<PAGE>



                  things  as it may  deem  proper,  and any  money  or  property
                  secured  in  exchange   therefor   shall  be  applied  to  the
                  Obligations or held by the Pledgee  pursuant to the provisions
                  of this Pledge Agreement;

         (c)      protect and preserve the Collateral;

         (d)      transfer the Collateral to its own or its nominee's name; and

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

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

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

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

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


                                      - 6 -


<PAGE>

8. Transfer, Voting, Dividends, Etc.

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

         (a)      the Pledgor shall have the right,  subject to the restrictions
                  hereinafter  imposed,  to vote  all  shares  comprised  in the
                  Collateral  with the same force and effect as though  they had
                  not been delivered to the Pledgee hereunder. If the Collateral
                  shall have been  transferred  into the name of the  Pledgee or
                  its  nominee  or  nominees,  the  Pledgee,  on  request of the
                  Pledgor  shall execute and deliver or cause to be executed and
                  delivered to the Pledgor suitable proxies for voting powers in
                  favour of the  nominee or  nominees of the Pledgor for voting,
                  and otherwise facilitate the voting of any such Securities. On
                  the  security  hereby  constituted  becoming  enforceable  the
                  Pledgee may enforce the right to vote the shares  comprised in
                  the Collateral in the same manner and to the same extent as if
                  it were the absolute  owner  thereof  until the Pledgor  shall
                  again be entitled under the provisions  hereof to exercise the
                  right of voting in  respect  of the  Collateral.  The  Pledgor
                  shall not use or vote or permit to be used or voted any of the
                  Collateral  for any purpose  contrary to the  covenants of the
                  Pledgor herein  contained or otherwise  inconsistent  with the
                  provisions or purposes hereof; and

         (b)      To the extent  permitted  in the Loan  Agreement,  the Pledgor
                  shall be entitled to receive and retain all dividends  paid or
                  declared  in respect of any  Collateral  (other  than stock or
                  liquidating  dividends) and all interest  payments  payable in
                  respect of the  Collateral,  and, from time to time,  upon the
                  written  request of the Pledgor,  the Pledgee shall deliver to
                  the  Pledgor  suitable  orders in favour of the Pledgor or its
                  nominee or nominees for the payment of such dividends, and the
                  Pledgee  shall  at once  pay  over  to the  pledgor  any  such
                  dividends  which  may  have  been  received  by it;  provided,
                  however,  that all shares or property  representing the shares
                  or  liquidating  dividends  or a  distribution  or  return  of
                  capital upon or in respect of the shares of stock constituting
                  Collateral   or  resulting   from  a  split-up,   revision  or
                  reclassification  of such  Collateral  or received in exchange
                  therefor, as a result of a merger, consolidation or otherwise,
                  shall be paid or transferred  directly to Pledgee  immediately
                  upon receipt thereof by Pledgor,  and shall be retained by the
                  Pledgee as Collateral hereunder.

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


                                     - 7 -


<PAGE>

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

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

9.                Defaults and Remedies.

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

         (a)      any Default, under and as defined in the Loan Agreement, shall
                  have occurred and be continuing; or

         (b)      any breach,  violation  or  non-performance  of any  warranty,
                  covenant or undertaking on the Pledgor's part hereunder; or

         (c)      any breach,  violation  or  non-performance  of any  warranty,
                  covenant  or  undertaking  on the part of JRS  under any other
                  agreement with the Pledgee.

9.2 Upon the occurrence of any Event of Default, the Pledgee may, at its option,
without notice to or demand on the Pledgor,  declare all Obligations immediately
due and payable,  and the Pledgee shall have the following  rights and remedies,
all of which may be exercised with or without further notice to the Pledgor,  at
the  Pledgee's  sole option and as the Pledgee in its sole  discretion  may deem
advisable:

         (a)      the Pledgee may enforce any and all security which it may hold
                  including the Collateral as it may in its sole discretion deem
                  fit; provided, however, that the Pledgee shall not be bound to
                  deal  with the  Collateral  nor  exercise  any right or remedy
                  thereunder  and shall not be liable  for any loss which may be
                  occasioned by any failure to do so;

         (b)      to settle,  compromise or release,  on terms acceptable to the
                  Pledgee, in whole or in part, any amounts owing


                                      - 8 -


<PAGE>

                  on the Collateral,  and to extend the time of payment,  in the
                  Pledgee's name or in the name of Pledgor, in respect thereof;

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

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

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

10. Redemption and Stock Dividends.  Unless the Pledgee consents in writing, the
Pledgor  shall not be entitled to receive and the Pledgee  shall not pay over to
the  Pledgor  the  redemption  price,  exclusive  of accrued  dividends,  of any
Collateral, nor any stock dividends on any Collateral nor such cash dividends on
any  such  Collateral  as  may  become  payable  on  or in  the  course  of  the
dissolution,  liquidation or winding-up of any corporation and which shall be in
any way the  proceeds of or  chargeable  to or payable out of capital.  Any such
redemption  price,  stock dividends and cash dividends  chargeable to or payable
out of capital received by the Pledgor shall forthwith be paid over or delivered
to the Pledgee  without  demand.  If the Pledgee  shall have  permitted any such
Collateral  to  remain  registered  in the  name  of the  Pledgor,  the  Pledgor
covenants to furnish to the Pledgee on demand suitable orders for the payment to
the Pledgee of any such  redemption  price or cash dividends which represent the
proceeds of or are  chargeable  to or payable out of capital or for the issue in
the name of the  Pledgee or its  nominee or  nominees,  and the  delivery to the
Pledgee of any such stock dividends.

11.  Protection of Securities.  The Pledgee may, in its discretion,  protect the
property  which  underlies or is charged or affected by any of the Collateral by
instituting or joining in judicial  proceedings by the purchase at judicial sale
thereof, by joining in any reorganization of such property or of the


                                      - 9 -


<PAGE>

corporation  owning the same,  or in any other manner which the Pledgee may deem
expedient.

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

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

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

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

16. Substituted  Collateral;  Additional Collateral.  The Pledgor may substitute
Collateral under this Pledge Agreement provided that any Collateral proposed for
substitution is satisfactory to the Pledgee in the Pledgee's sole discretion. As
of the date of delivery  of any  Collateral  approved  for  substitution  by the
Pledgee pursuant to this Section 16 or otherwise approved as additional security
pursuant to this Pledge  Agreement,  the Pledgor  represents and warrants to the
Pledgee that (1) the Pledgor will own such shares,  certificates and instruments
free and clear of any right of any other  person or entity,  and (2) the Pledgor
will have good and marketable title to the shares,  certificates and instruments
and have the right to pledge such shares,  certificates or instruments  pursuant
to this  Pledge  Agreement.  By  delivery  of  such  substituted  or  additional
Collateral,  the Pledgor shall have  represented  and warranted that the Pledgee
has a  valid,  perfected,  first  priority  security  interest  in such  shares,
certificates  and  instruments  and the  proceeds  thereof free and clear of all
liens, claims and rights of third parties whatsoever. All documentary,  stamp or
other taxes or fees owing in connection with the issuance, transfer


                                     - 10 -


<PAGE>

and/or pledge of the Collateral or any substituted or additional Collateral have
been paid and will  hereafter  be paid by the  Pledgor  as such  become  due and
payable.

17. Records.  The records of the Pledgee as to payment of the Indebtedness being
in default or of any demand for  payment  having  been made shall be prima facie
evidence of such default or demand.

18. Application of Payments. Payments made in respect of the Indebtedness or the
Liability  to the  Pledgee  from time to time and the moneys  realized  from any
securities held therefor  (including moneys realized from the enforcement of any
of the Collateral) may be applied on such part or parts of the  Indebtedness and
Liability or either of them as the Pledgee may see fit, and the Pledgee shall at
all times and from time to time have the right to change  and  appropriation  of
any  moneys  received  by it and  re-apply  the same on any part or parts of the
Indebtedness  and  Liability  or  either  of them as the  Pledgee  may see  fit,
notwithstanding any previous application by whomsoever made, and the Pledgee may
grant  extensions,  take  and give up  securities,  accept  compositions,  grant
releases  and  discharges  and  otherwise  make  arrangements  and deal with the
Pledgor and with others as the  Pledgee  may see fit  without  prejudice  to the
liability of the Pledgor to the Pledgee,  the Pledgee's claim for any deficiency
or the  Pledgee's  right to hold,  deal with and realize on the  security of the
Collateral.

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

20. Delivery of Copy/Waiver. The Pledgor hereby acknowledges receiving a copy of
this Security Agreement  (Securities).  The Pledgor waives all rights to receive
from the Pledgee a copy of any financing statement or financing change statement
registered  or  verification  statement  issued at any time in  respect  of this
Security Agreement (Securities).

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


                                     - 11 -


<PAGE>

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

23.  Entire  Agreement/Amendment.  This  Pledge  Agreement  contains  the entire
agreement  between  the  parties  hereto  with  respect to the  Collateral.  Any
amendment of this Pledge  Agreement  shall not be binding  unless in writing and
signed by the Pledgor and the Pledgee.  The Pledgor  confirms  that there are no
representation,  warranties,  covenants or acknowledgments  affecting, or relied
upon in entering this Pledge Agreement.

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

25.  Severability.  Any provision of this Pledge Agreement  prohibited by law or
otherwise   ineffective  shall  be  ineffective  only  to  the  extent  of  such
prohibition or  ineffectiveness  and shall be severable without  invalidating or
otherwise affecting the remaining provisions hereof.

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

27.  Applicable  Law. This Pledge  Agreement  shall be construed and enforceable
under and in accordance with the laws of Alberta.

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

                  IN WITNESS  WHEREOF,  JAN VO EQUITIES  LTD., has executed this
Security  Agreement  (Securities)  by its duly  authorized  signatory  under its
common seal on November 17, 1997.

JAN VO EQUITIES LTD.

                                                     C/S

By:/s/ Donald E. Janveau
   ---------------------
       Name: Donald E. Janveau
       Title: President


                                     - 12 -


<PAGE>

                                    SCHEDULE

                           LIST OF SHARE CERTIFICATES


              27 CLASS A SHARES OF JRS EXPLORATION COMPANY LIMITED

              27 CLASS B SHARES OF JRS EXPLORATION COMPANY LIMITED

                                     - 13 -




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