Document:

Prepared by MERRILL CORPORATION www.edgaradvantage.com

   EXHIBIT 10.2  

CHANGE OF CONTROL AGREEMENT  

    This Change of Control Agreement (the "Agreement") is effective as of             , 2000 (the "Effective Date"), by and
between Gary Ampulski (the "Employee"), and TAB Products Co., a Delaware corporation (the "Company"). 

RECITALS 

    A.  The
Employee has entered into an employment agreement (the "Employment Agreement") with the Company, dated as of the Effective Date, and presently serves at the
pleasure of the Board of Directors of the Company and performs significant strategic and management responsibilities necessary to the continued conduct of the Company's business and operations. 

    B.  The
Board of Directors of the Company (the "Board") has determined that it is in the best interests of the Company and its stockholders to assure that the Company
will have the continued dedication and objectivity of the Employee, notwithstanding the possibility or occurrence of a Change of Control (as defined below) of the Company. 

    C.  The
Board believes that it is imperative to provide the Employee with certain severance benefits upon the Employee's termination of employment under the
circumstances described herein which provide the Employee with enhanced financial security and provide sufficient incentive and encouragement to the Employee to remain with the Company following a
Change of Control. 

    D.  Certain
capitalized terms used in the Agreement are defined in Section 3 below. 

    In
consideration of the mutual covenants herein contained, and as an additional inducement to Employee to enter into the Employment Agreement, the parties agree as follows: 

    1.  Terms of Employment. The Company and the Employee agree that the Employee's employment is at will, and that their
employment relationship may be terminated by either party at any time, with or without cause. If the Employee's employment terminates for any reason within three (3) months prior to, upon or
within twelve (12) months following a Change of Control, the Employee shall not be entitled to any payments, benefits, damages, awards or compensation other than as provided by this Agreement. 

    2.  Severance Benefits. Subject to Section 2 (c) below: 

    (a) Termination Upon A Change of Control. If the Employee's employment is terminated within three (3) months
prior to, upon or within twelve (12) months following a Change of Control, then the Employee shall be entitled to receive the compensation and benefits earned by the Employee pursuant to
Paragraph 3 of the Employment Agreement through the date of the Employee's termination of employment and in addition thereto the following severance benefits, as applicable: 

     (i) Involuntary Termination. If the Employee's employment is terminated as a result of Involuntary Termination (as
defined in Section 3(b) below), then the Employee shall be entitled to receive the following: 

    (A) Severance
payments equal to the sum of: (1) an amount equal to two times the Employee's annual base salary determined on the basis of the Employee's base
salary rate 

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in effect immediately prior to the Employee's Involuntary Termination and (2) whichever of the following is applicable as of the date of the Employee's Involuntary Termination: 

    (I) provided
that the Employee has completed at least two full fiscal years of employment with the Company, an amount equal to two times the average of the annual
incentive bonuses pursuant to
subparagraph 3(b) (INCENTIVE BONUS) of the Employment Agreement actually earned by the Employee for the two fiscal years of the Company preceding the fiscal year of such Involuntary Termination; or 

    (II) provided
that the Employee has completed at least one full fiscal year of employment with the Company but less than two full fiscal years of such employment, an
amount equal to two times the annual incentive bonus pursuant to subparagraph 3(b) (INCENTIVE BONUS) of the Employment Agreement actually earned by the Employee for the fiscal year of the Company
preceding the fiscal year of such Involuntary Termination; or 

   (III) provided
that the Employee has completed less than one full fiscal year of employment with the Company, an amount equal to $300,000. 

    (B) Except
in the event that Subsection 2(a)(i)(A)(III) is applicable, the Employee shall also be entitled to receive as a severance payment that portion of the
incentive bonus provided under subparagraph 3(b) (INCENTIVE BONUS) of the Employment Agreement, if any, the Employee will have earned for the fiscal year of the Involuntary Termination on the basis of
the achievement of the agreed upon goals for the fiscal year of the Involuntary Termination pro rated to the date of such termination. 

    (C) In
addition to the foregoing, in the event of the Employee's Involuntary Termination prior to December 1, 2001, the Employee shall be entitled to receive as
a severance payment the retention bonus pursuant to subparagraph 3(d) (RETENTION BONUS) of the Employment Agreement. 

    (D) In
addition to the foregoing, Employee shall be entitled to receive a portion of the compensation specified in subparagraphs 3(e) (BENEFITS) and 3(f) (VACATION) of
the Employment Agreement, pro rated to the date of the Involuntary Termination. 

    (E) In
addition to the foregoing, for a period of up to eighteen (18) months after any termination under this Subsection 2(a)(i), the Company shall reimburse the
Employee for any COBRA premiums paid by the Employee for continued group health insurance coverage (the "Employment Benefits"). If the Employee's medical coverage immediately prior to the date of
termination of employment included the Employee's dependents, the Company paid COBRA premiums shall include premiums for such dependents. Such Employment Benefits shall terminate upon the earlier of
(1) eighteen (18) months from the date of the Employee's termination or (2) upon commencement of new employment by the Employee. 

    The
Employee's right to receive the severance benefits described in this Subsection 2(a)(i) shall be conditioned upon the Employee's execution and delivery of a general release
of claims in a form satisfactory to the Company. Any severance payment to which the Employee is entitled pursuant to this Subsection 2(a)(i) shall be paid in a lump sum within thirty
(30) days of the Employee's Involuntary Termination. 

    (ii) Voluntary Resignation. If the Employee's employment terminates by reason of the Employee's voluntary resignation
(but which is not an Involuntary Termination or a termination for Cause), then the Employee shall not be entitled to receive severance or other benefits following the date of such termination under
the terms of this Agreement other than 

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the compensation and benefits earned by the Employee pursuant to Paragraph 3 of the Employment Agreement through the date of the Employee's termination of employment, except that the Employee
shall not be entitled to any pro rated portion of the incentive bonus for that fiscal year, and the Company shall have no obligation to provide for the continuation of any health and medical benefit
or life insurance plans existing on the date of such termination except as otherwise required by applicable law. 

    (iii) Disability; Death. If the Company terminates the Employee's employment as a result of the Employee's Disability,
or such Employee's employment is terminated at any time due to the death of the Employee, then the Employee shall not be entitled to receive severance or other benefits following the date of such
termination under the terms of this Agreement other than the compensation and benefits earned by the Employee pursuant to Paragraph 3 of the Employment Agreement through the date of the
Employee's termination of employment, except that the Employee shall not be entitled to any pro rated portion of the incentive bonus for that fiscal year, and the Company shall have no obligation to
provide for the continuation of any health and medical benefit or life insurance plans existing on the date of such termination except as otherwise required by applicable law. 

    (iv) Termination for Cause. If the Employee is terminated for Cause, then the Employee shall not be entitled to receive
any severance or other benefits following the date of such termination under the terms of this Agreement other than the compensation and benefits earned by the Employee pursuant to Paragraph 3
of the Employment Agreement through the date of the Employee's termination of employment, except that the Employee shall not be entitled to any pro rated portion of the incentive bonus for that fiscal
year and the Company shall have no obligation to provide for the continuation of any health and medical benefit or life insurance plans existing on the date of such termination except as otherwise
required by applicable law. 

    (b) Stock Option Acceleration. In the event of a Change of Control, the Option provided in subparagraph 3(g) (STOCK
OPTION) of the Employment Agreement shall become immediately exercisable and vested in full as of the date that is ten (10) days prior to the Change of Control, provided that any exercise of
the Option permissible as a result of the foregoing acceleration of vesting shall be conditioned upon the consummation of the Change of Control. In addition, the surviving, continuing, successor, or
purchasing corporation or other business entity or parent thereof, as the case may be, may, without the consent of the Employee, either assume the Company's rights and obligations under the Option or
substitute a substantially equivalent option. The Option shall terminate effective as of the date of the Change of Control to that extent that the Option is neither assumed nor exercised as of the
date of the Change of Control. 

    (c) Excess Parachute Payments. In the event that any payment or benefit (including any acceleration of vesting or
exercisability of the Option) received or to be received by the Employee pursuant to this Agreement or otherwise would subject the Employee to any excise tax pursuant to Section 4999 of the
Internal Revenue Code of 1986, as amended (the "Code"), due to a characterization of such payment or benefit as an "excess parachute payment" under Section 280G of the Code, then the Employee
may elect, in his sole discretion, to reduce the amount of any payments or benefits (including any acceleration of vesting or exercisability of the Option) otherwise called for under this Agreement in
order to avoid such characterization. 

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    3.  Definition of Terms. The following terms referred to in this Agreement shall have the following meanings: 

    (a) Change of Control. "Change of Control" shall mean the occurrence of either of the following events: 

     (i) Any
"person" (as such term is used in Sections 13(d) and 14(d) of the Securities Exchange Act of 1934, as amended) is or becomes the "beneficial owner" (as defined
in Rule 13d-3 under said Act), directly or indirectly, of securities of the Company representing more than fifty percent (50%) of the total combined voting power represented by the
Company's then outstanding voting securities; or 

    (ii) (A)
a merger or consolidation of the Company with any other corporation or other business entity, other than a merger or consolidation which would result in the
voting securities of the Company outstanding immediately prior thereto continuing to represent (either by remaining outstanding or by being converted into voting securities of the surviving entity or
parent thereof) more than fifty percent (50%) of the total combined voting power represented by the voting securities of the Company or such surviving or parent entity outstanding immediately after
such merger or consolidation; or (B) the
complete liquidation of the Company; or (C) the sale or disposition by the Company of all or substantially all the Company's assets, unless the Company remains an operating business and a going
concern, and, with respect to subsection 2(b), the Company continues the Option in effect. 

    (b) Involuntary Termination. "Involuntary Termination" shall mean the Employee's resignation within 60 days after
any of the following: 

     (i) Without
the Employee's express written consent, the assignment to the Employee of any significant duties or the significant reduction of the Employee's duties,
either of which is materially inconsistent with the Employee's position with the Company and responsibilities in effect immediately prior to such assignment, or the removal of the Employee from such
position and responsibilities, which is not effected for death, Disability or for Cause; 

    (ii) Without
the Employee's express written consent, any reduction by the Company in the Employee's base salary and/or or maximum incentive bonus (subject, however, to
satisfaction of applicable goals with respect to the actual amount of incentive bonus earned) as in effect immediately prior to such reduction; 

    (iii) Without
the Employee's express written consent, any reduction by the Company in the kind or level of employee benefits to which the Employee is entitled
immediately prior to such reduction, other than a reduction applied generally to executive officers of the Company; 

    (iv) Without
the Employee's express written consent, the relocation of the Employee to a facility or a location more than 40 miles from the Employee's then present
location, without the Employee's express written consent; or 

    (v) The
failure of the Company to obtain the assumption of the terms of this Agreement by any successors contemplated in Section 4 below, provided, however, that
the Employee's resignation as a result of any of the foregoing conditions shall be a voluntary resignation, and not an involuntary termination, unless the Employee gives written notice of any such
condition(s) to the Board and allows the Company at least 10 days thereafter to correct such condition(s). 

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    (c) Cause. For purposes of this Agreement, a termination for "Cause" occurs if the Employee is terminated for any of the
following reasons: 

     (i) The
Employee's theft, dishonesty, misconduct or intentional falsification of any employment or Company records; 

    (ii) The
Employee's intentional and improper disclosure or use of the Company's confidential or proprietary information; 

    (iii) Any
action by the Employee that has a material detrimental effect on the Company's reputation or business; 

    (iv) The
Employee's failure or inability to perform any assigned duty reasonably expected of a person holding the Employee's position after written notice from the
Board to the Employee of, and a reasonable opportunity to cure, such failure or inability; or 

    (v) The
Employee's conviction (including any plea of guilty or nolo contendere) for any criminal act that impairs the Employee's ability to perform his duties for the
Company. 

    (d) Disability. "Disability" shall mean that the Employee is unable to perform his duties as an employee of the Company
as the result of his incapacity due to physical or mental impairment for 120 days (not necessarily consecutive) in any one year period. Termination resulting from Disability may only be
effected after at least 30 days' written notice by the Company of its intention to terminate the Employee's employment. In the event that the Employee resumes the performance of substantially
all of his duties as an employee of the Company before the termination of his employment becomes effective, the notice of intent to terminate shall automatically be deemed to have been revoked. 

    4.  Employee Covenant Regarding Nonsolicitation. For a period of one (1) year following termination of employment
for any reason, the Employee shall not recruit, solicit, or invite the solicitation of any employees of the Company to terminate their employment with the Company. 

    5.  Successors. 

    (a) Company's Successors. Any successor (or parent thereof) to the Company (whether direct or indirect and whether by
purchase, lease, merger, consolidation, liquidation or otherwise) or to all or substantially all of the Company's business and/or assets shall assume the obligations under this Agreement and agree
expressly to perform the obligations under this Agreement in the same manner and to the same extent as the Company would be required to perform such obligations in the absence of a succession. For all
purposes under this Agreement, the term "Company" shall include any successor (or parent thereof) to the Company's business and/or assets which executes and delivers the assumption agreement described
in this subsection (a) or which becomes bound by the terms of this Agreement by operation of law. 

    (b) Employee's Successors. All rights of the Employee hereunder shall inure to the benefit of, and be enforceable by,
the Employee's personal or legal representatives, executors, administrators, successors, heirs, distributees, devisees and legatees. Employee shall have no right to assign any of his obligations or
duties under this Agreement to any other person or entity. 

    6.  Notice. 

    (a) General. Notices and all other communications contemplated by this Agreement shall be in writing and shall be deemed
to have been duly given when personally delivered or when mailed by U.S. registered or certified mail, return receipt requested and postage prepaid. In the case of the Employee, mailed notices shall
be addressed to him at the home address which he most recently communicated to the Company in writing. In the case of the Company, mailed notices 

5

 

shall be addressed to its corporate headquarters, and all notices shall be directed to the attention of its Secretary. 

    (b) Notice of Termination. Any termination by the Company for Cause or by the Employee as a result of a voluntary
resignation or an Involuntary Termination shall be communicated by a notice of termination to the other party hereto given in accordance with Section 6 of this Agreement. Such notice shall
indicate the specific termination provision in this Agreement relied upon, shall set forth in reasonable detail the facts and circumstances claimed to provide a basis for termination under the
provision so indicated, and shall specify the termination date (which shall be not more than 15 days after the giving of such notice). 

    7.  Miscellaneous Provisions. 

    (a) No Duty to Mitigate. The Employee shall not be required to mitigate the amount of any payment contemplated by this
Agreement (whether by seeking new employment or in any other manner), nor, except with respect to the Employment Benefits as described in Section 2(a)(i), shall any such payment be reduced by
any earnings that the Employee may receive from any other source. 

    (b) Waiver. No provision of this Agreement shall be modified, waived or discharged unless the modification, waiver or
discharge is agreed to in writing and signed by the Employee and by an authorized officer of the Company (other than the Employee). No waiver by either party of any breach of, or of compliance with,
any condition or provision of this Agreement by the other party shall be considered a waiver of any other condition or provision or of the same condition or provision at another time. 

    (c) Choice of Law. The validity, interpretation, construction and performance of this Agreement shall be governed by the
laws of the State in which the principal executive offices of the Company are located. 

    (d) Severability. The invalidity or unenforceability of any provision or provisions of this Agreement shall not affect
the validity or enforceability of any other provision hereof, which shall remain in full force and effect. 

    (e) Arbitration. In the event of any dispute or claim relating to or arising out of the Employee's employment
relationship with the Company, this Agreement, or the termination of the Employee's employment with the Company for any reason (including, but not limited to, any claims of breach of contract,
wrongful termination, fraud or age, race, sex, national origin, disability or other discrimination or harassment), the Employee and the Company agree that all such disputes shall be fully, finally and
exclusively resolved by binding arbitration conducted by the American Arbitration Association in the County in which the principal executive offices of the Company are located. The Employee and the
Company hereby knowingly and willingly waive their respective rights to have any such disputes or claims tried to a judge or jury; provided, however, that this arbitration provision shall not apply to
any claims for injunctive relief by the Employee or the Company. 

    (f)  No Assignment of Benefits. The rights of any person to payments or benefits under this Agreement shall not be made
subject to option or assignment, either by voluntary or involuntary assignment or by operation of law, including (without limitation) bankruptcy, garnishment, attachment or other creditor's process,
and any action in violation of this subsection (f) shall be void. 

    (g) Employment Taxes. All payments made pursuant to this Agreement will be subject to withholding of applicable income
and employment taxes. 

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    (h) Assignment by Company. The Company may assign its rights under this Agreement to an affiliate, and an affiliate may
assign its rights under this Agreement to another affiliate of the Company or to the Company; provided, however, that no assignment shall be made if the net worth of the assignee is less than the net
worth of the Company at the time of assignment. In the case of any such assignment, the term "Company" when used in a section of this Agreement shall mean the corporation that actually employs the
Employee. 

    (i)  Counterparts. This Agreement may be executed in counterparts, each of which shall be deemed an original, but all of
which together will constitute one and the same instrument. 

    (j)  Prior Agreements. This Agreement, together with the Employment Agreement, shall supersede all prior arrangements
whether written or oral, and understandings, regarding the subject matter of this Agreement. 

    IN
WITNESS WHEREOF, each of the parties has executed this Agreement, in the case of the Company by its duly authorized officer, as of the day and year first above written. 

	COMPANY	 	TAB PRODUCTS CO.
	

 	
 	

By:	
 	

/s/ HANS A. WOLF   

	

 	
 	

Title:	
 	

Chairman

	

EMPLOYEE	
 	

By:	
 	

/s/ GARY W. AMPULSKI   

7<PAGE>

                      SUBORDINATION AND AMENDMENT AGREEMENT

                  This SUBORDINATION AND AMENDMENT AGREEMENT (this "AGREEMENT")
is entered into as of April 9, 2001, by and among GEOKINETICS INC., a Delaware
corporation, and its subsidiaries listed on the signature pages hereof
(collectively, the "COMPANY"), the holders of the Company's 13 1/2% Senior
Secured Notes listed on the signature pages hereof (the "JUNIOR CREDITORS") and
GEOLEASE PARTNERS, L.P., a Delaware limited partnership ("LESSOR").

                                    RECITALS

                  A.       Concurrently with the execution hereof, (i) Lessor is
purchasing the equipment leased to the Company under the Lease Agreement between
Input/Output, Inc., as lessor ("IO"), and the Company, as lessee, dated October
1, 1999, as amended to date (the "LEASE AGREEMENT"), from IO, (ii) IO is
assigning its rights under the Lease Agreement to Lessor, (iii) Lessor and the
Company are entering into Amendment No. 1 to the Lease Agreement attached hereto
as EXHIBIT A ("AMENDMENT NO. 1") and (iv) MHR Capital Partners LP ("MHR") is
selling and transferring all of its 2002 Notes (as defined below) and 2002
Warrants (as defined below) to IO.

                  B.       As an inducement to and as one of the conditions
precedent to the acquisition of IO's interest, Lessor requires the execution and
delivery of this Agreement by the Junior Creditors and the Company.

                  NOW, THEREFORE, in order to induce Lessor to acquire IO's
interest in the Lease Agreement, and for other good and valuable consideration,
the receipt and sufficiency of which hereby are acknowledged, the parties hereto
hereby agree as follows:

                  1.       DEFINITIONS. The following terms shall have the
following meanings in this Agreement:

                  COLLECTION ACTION shall mean (a) to demand, sue for, take or
receive (other than as permitted hereunder) from or on behalf of the Company by
set-off or in any other manner, the whole or any part of any moneys which may
now or hereafter be owing by the Company with respect to the Junior Debt, (b) to
initiate or participate with others in any suit, action or proceeding against
the Company to (i) enforce payment of or to collect the whole or any part of the
Junior Debt or (ii) commence judicial enforcement of any of the rights and
remedies under the Junior Debt Documents or applicable law with respect to the
Junior Debt or the Junior Debt Documents, or (c) to accelerate any Junior Debt.

                  DISQUALIFIED CAPITAL STOCK shall mean that portion of any
capital stock of the Company which, by its terms (or by the terms of any
security into which it is convertible or for which it is exchangeable), or upon
the happening of any event, matures or is mandatorily redeemable, pursuant to a
sinking fund obligation or otherwise, or is redeemable at the sole option of the
holder thereof on or prior to the maturity date for payment of the Senior
Obligations.

<PAGE>
                                       -2-

                  INDENTURE shall have the meaning ascribed to such term in the
Junior Notes.

                  JUNIOR DEBT shall mean all of the obligations of the Company
to the Junior Creditors evidenced by the Junior Debt Documents.

                  JUNIOR DEBT DOCUMENTS shall mean the Junior Notes and all
other documents and instruments pertaining to all or any portion of the Junior
Debt.

                  JUNIOR DEFAULT shall mean an "Event of Default" as defined in
the Junior Notes, as the same may be amended, supplemented or otherwise modified
from time to time as permitted hereunder.

                  JUNIOR DEFAULT NOTICE shall mean a written notice from the
Junior Creditors to Lessor pursuant to which Lessor is notified of the
occurrence of a Junior Default, which notice incorporates a reasonably detailed
description of such Junior Default.

                  JUNIOR NOTES shall mean the Company's 2002 Notes and 2005
Notes.

                  JUNIOR SECURITY shall mean any capital stock (other than
Disqualified Capital Stock), any Qualified Rights and any indebtedness of the
Company that (i) is subordinated in right of payment to the Senior Obligations
at least to the same extent as the Junior Debt, (ii) has no scheduled
installment of principal due, by redemption, sinking fund payment or otherwise,
on or prior to (a) the last scheduled date for payment of the Senior Obligations
(other than in respect of Deferred Rent (as defined in Amendment No. 1)) and (b)
with respect to Junior Debt representing obligations relating to 2005 Notes, the
scheduled date for payment of the Deferred Rent, and (iii) has no terms more
beneficial in the aggregate to the holders thereof other than those in effect
with respect to the Junior Debt on the date of this Agreement, including but not
limited to the obligation of the Company to pay interest in cash or additional
securities prior to the 2005 Maturity Date (as defined in the Indenture).

                  NON-AFFILIATED NOTEHOLDER shall mean any holder of 2002 Notes
who (i) is not an Affiliate (as defined in the Lease Agreement) of the Lessor or
the Lessee and (ii) owns at least $300,000 of the 2002 Notes; PROVIDED, that
each of DLJ Investment Partners, L.P., DLJ Investment Funding, Inc. and DLJ ESC
II L.P. or any of their respective Affiliates, so long as it shall be a holder
of at least $300,000 of the 2002 Notes, shall be deemed to be an Affiliate of
the Lessor.

                  PERSON shall mean an individual, partnership, corporation,
unincorporated organization, trust or joint venture, or a governmental agency or
political subdivision thereof.

                  PROCEEDING shall mean any voluntary or involuntary insolvency,
bankruptcy, receivership, custodianship, liquidation, dissolution,
reorganization, assignment for the benefit of creditors, appointment of a
custodian, receiver, trustee or other officer with similar powers or any other
proceeding for the liquidation, dissolution or other winding up of a Person.

                  QUALIFIED RIGHTS shall mean options, warrants or other rights
to purchase capital stock (other than Disqualified Capital Stock), other than
any such rights that, by their terms or upon

<PAGE>
                                       -3-

the happening of any event, are mandatorily redeemable or redeemable at the sole
option of the holder thereof on or prior to the last scheduled date for payment
of the Senior Obligations.

                  SENIOR COVENANT DEFAULT shall mean any "Lease Event of
Default" described in the Lease Agreement other than a Senior Payment Default.

                  SENIOR DEFAULT shall mean any Senior Payment Default or Senior
Covenant Default.

                  SENIOR DEFAULT NOTICE shall mean a written notice from Lessor
to the Company pursuant to which the Company is notified of the occurrence of a
Senior Covenant Default, which notice incorporates a reasonably detailed
description of such Senior Covenant Default.

                  SENIOR OBLIGATIONS shall mean (a) with respect to the Junior
Notes, all obligations for "Rent" and "Supplemental Rent" described in the Lease
Agreement, and all interest, penalties, fees, indemnifications, reimbursements,
damages and other liabilities payable thereunder, together with (i) all complete
or partial refinancings of the Senior Obligations and any amendments,
modifications, renewals or extensions of any of the foregoing consistent with
the terms of this Agreement and (ii) any interest accruing on the foregoing
after the commencement of a Proceeding, without regard to whether or not such
interest is an allowed claim, and (b) with respect to the 2005 Notes, all
obligations for Deferred Rent (as defined in Amendment No. 1), as such
obligations shall be amended, modified, renewed or extended, and all interest,
penalties, fees, indemnifications, reimbursements, damages and other liabilities
payable thereunder (but subject to Section 3).

                  SENIOR OBLIGATIONS DOCUMENTS shall mean the Lease Agreement
and all other documents and instruments evidencing or pertaining to all or any
portion of the Senior Obligations.

                  SENIOR PAYMENT DEFAULT shall mean any default in payment of
Senior Obligations (whether before or after acceleration thereof).

                  THIRD PARTY HOLDERS shall mean holders of Junior Debt and
Warrants, as applicable, other than IO and MHR.

                  2002 NOTES shall mean the Company's 13 1/2% Senior Secured
Notes due 2002 in thE aggregate principal amount of up to $6,837,338, which term
shall include the guarantees annexed thereto.

                  2002 WARRANTS shall mean warrants issued in connection with
the issuance of the 2002 Notes.

                  2005 NOTES shall mean the Company's 13 1/2% Senior Secured
Notes due 2005 in the aggregate principal amount of up to $51,687,993, which
term shall include the guarantees annexed thereto.

                  2005 WARRANTS shall mean warrants issued in connection with
the issuance of the 2005 Notes.

<PAGE>

                  VOTING RIGHTS shall have the meaning ascribed to such term in
Section 10.

                  WARRANT AGREEMENT shall mean the Amended and Restated Warrant
Agreement among Geokinetics, Inc. and the Junior Creditors dated as of April 30,
1998 and Amended and Restated as of October 1, 1999 pursuant to which the
Warrants were issued.

                  WARRANTS shall mean the 2002 Warrants and the 2005 Warrants.

                  2.       SUBORDINATION.

                           2.1      SUBORDINATION OF JUNIOR DEBT TO SENIOR
OBLIGATIONS. The Company covenants and agrees, and each Junior Creditor by its
execution of this Agreement or its acceptance of the Junior Notes upon transfer
or assignment, likewise covenants and agrees that the payment of any and all of
the Junior Debt shall be subordinate and subject in right of payment, to the
extent and in the manner hereinafter set forth, to the prior payment in full of
the Senior Obligations, and that each holder of Senior Obligations, whether now
outstanding or hereafter created, incurred, assumed or guaranteed, shall be
deemed to have acquired Senior Obligations in reliance upon the provisions
contained in this Agreement.

                           2.2      PROCEEDINGS. In the event of any Proceeding
involving the Company, (a) all Senior Obligations first shall be paid in full in
cash before any payment of or with respect to the Junior Debt shall be made, (b)
any payment or distribution, whether in cash, property or securities which, but
for the terms hereof, otherwise would be payable or deliverable in respect of
the Junior Debt (other than Junior Securities), shall be paid or delivered
directly to Lessor (to be held and/or applied by Lessor in accordance with the
terms of the Lease Agreement) until all Senior Obligations are paid in full, and
each Junior Creditor irrevocably authorizes, empowers and directs all receivers,
trustees, liquidators, custodians, conservators and others having authority in
the premises to effect all such payments and distributions, and each Junior
Creditor also irrevocably authorizes, empowers and directs Lessor to demand, sue
for, collect and receive every such payment or distribution, (c) each Junior
Creditor agrees to execute and deliver to Lessor or its representatives all such
further instruments confirming the authorization referred to in the foregoing
clause (b), (d) each Junior Creditor agrees not to initiate or prosecute or
encourage any other person to initiate or prosecute any claim, action or other
proceeding challenging the enforceability of the Senior Obligations or any liens
and security interests securing the Senior Obligations, and (e) each Junior
Creditor agrees to execute, verify, deliver and file any proofs of claim in
respect of the Junior Debt requested by Lessor in connection with any such
Proceeding and hereby irrevocably authorizes, empowers and appoints Lessor its
agent and attorney-in-fact to (i) execute, verify, deliver and file such proofs
of claim in respect of the Junior Debt in connection with such proceeding upon
the failure of such Junior Creditor to do so prior to 30 days before the
expiration of the time to file any such proof of claim and (ii) vote such claim
in any such Proceeding upon the failure of such Junior Creditor to do so prior
to 5 business days before the expiration of the time to vote any such claim;
PROVIDED, that Lessor shall have no obligation to execute, verify, deliver, file
and/or vote any such proof of claim. In the event that Lessor votes any claim in
accordance with the authority granted hereby, such Junior Creditor shall not be
entitled to change or withdraw such vote. The Senior Obligations shall continue
to be treated as Senior Obligations and the provi-

<PAGE>
                                      -5-

sions of this Agreement shall continue to govern the relative rights and
priorities of Lessor and Junior Creditors even if all or part of the Senior
Obligations or the security interests securing the Senior Obligations are
subordinated, set aside, avoided or disallowed in connection with any such
Proceeding and this Agreement shall be reinstated if at any time any payment of
any of the Senior Obligations is rescinded or must otherwise be returned by any
holder of Senior Obligations or any representative of such holder.

                           2.3      PAYMENT UPON SENIOR DEFAULT. The Company may
not make and no Junior Creditor may receive any payment of principal, interest
or any other amount due with respect to the Junior Debt (other than Junior
Securities) if, at the time of such payment:

                  (a)      A Senior Payment Default exists and such Senior
         Payment Default shall not have been cured or waived in accordance with
         the terms of the Senior Obligations Documents, or

                  (b)      Subject to subsection 2.3(d), (i) the Company shall
         have received a Senior Default Notice from Lessor stating that a Senior
         Covenant Default exists or would be created by the making of such
         payment, (ii) each such Senior Covenant Default shall not have been
         cured or waived in accordance with the terms of the Senior Obligations
         Documents, and (iii) 180 days shall not have elapsed since the date
         such Senior Default Notice was received. Lessor and the Company agree
         to furnish each Junior Creditor any Senior Default Notice within five
         business days of the delivery thereof to the Company; PROVIDED, that
         the failure to provide such notice shall not affect the validity of the
         provisions of this subsection 2.3.

                  (c)      The Company may resume payments (and may make any
         payments missed due to the application of clause (a) or (b) of this
         subsection 2.3) in respect of the Junior Debt or any judgment with
         respect thereto:

                           (1)      In the case of a Senior Payment Default
                  referred to in clause (a) of this subsection 2.3, upon a cure
                  or waiver thereof in accordance with the terms of the Senior
                  Obligations Documents; or

                           (2)      In the case of a Senior Covenant Default
                  referred to in clause (b) of this subsection 2.3, upon the
                  earlier to occur of (x) the cure or waiver thereof in
                  accordance with the terms of the Senior Obligations Documents
                  or (y) the expiration of such 180-day period described in
                  subsection 2.3(b)(iii).

                  (d)      Notwithstanding any provision of this subsection 2.3
         to the contrary:

                           (1)      The Company shall not be prohibited from
                  making, and the Junior Creditors shall not be prohibited from
                  receiving, payments under clause (b) of this subsection 2.3
                  for more than an aggregate of 180 days within any period of
                  360 consecutive days;

<PAGE>
                                      -6-

                           (2)      No Senior Covenant Default existing on the
                  date any notice is given pursuant to clause (b)(i) of this
                  subsection 2.3 shall, unless the same shall have ceased to
                  exist for a period of at least 30 consecutive days, be used as
                  a basis for any subsequent such notice; and

                           (3)      The failure of the Company to make any
                  payment with respect to the Junior Debt by reason of the
                  operation of this subsection 2.3 shall not be construed as
                  preventing the occurrence of a Junior Default under the
                  applicable Junior Debt Documents.

The provisions of this subsection 2.3 shall not apply to any payment with
respect to which subsection 2.2 would be applicable.

                           2.4      PAYMENTS OTHERWISE PERMITTED. Nothing
contained in this Section 2 or elsewhere in this Agreement or in the Junior Debt
Documents shall prevent the Company at any time, except during the pendency of
any Proceeding referred to in subsection 2.2 or under the conditions referred to
in subsection 2.3, from making, or Junior Creditors from receiving, (i)
scheduled payments of accrued interest on the Junior Notes, (ii) payments of
principal and accrued interest on the Junior Notes at maturity and (iii) other
payments (excluding payments of principal or interest on the Junior Notes) with
respect to the Junior Debt when and as due under the Junior Debt Documents.

                           2.5      RESTRICTION ON ACTION BY JUNIOR CREDITOR.

                  (a)      Until the Senior Obligations are paid in full in
cash, no Junior Creditor shall, without the prior written consent of Lessor,
take any Collection Action with respect to the Junior Debt, except as permitted
in the following sentence. Upon the earliest to occur of:

                  (i)      acceleration of the Senior Obligations; or

                  (ii)     a Proceeding involving the Company; or

                  (iii)    the passage of 90 days from the date Lessor receives
         written notice of the occurrence of any Junior Default if such Junior
         Default shall not have been cured or waived within such period;

Junior Creditors owning twenty-five percent of the Junior Debt may, upon five
business days' prior written notice to Lessor, accelerate the Junior Debt or
take any other Collection Action which is not inconsistent with or in
contravention of the enforcement actions taken by the holders of the Senior
Obligations and the provisions of this Agreement; PROVIDED, HOWEVER, that if
following the acceleration of the Senior Obligations as described in clause (i)
above, such acceleration is rescinded, then all Collection Actions taken by
Junior Creditor shall likewise be rescinded if such Collection Action is based
solely on clause (i) above; PROVIDED, FURTHER, no Collection Action may be taken
with respect to a payment blockage period under subsection 2.3(a) or (b), prior
to the earlier to occur of the cure or waiver of the event giving rise to such
payment blockage period under this Agreement or the expira-

<PAGE>
                                      -7-

tion of 90 days after the commencement of such payment blockage period
(although, in each instance, notice of the Junior Creditors' intent to exercise
legal remedies may be given during such period). Such five business day notice
may be given during the 90-day period described in clause (iii) above.

                  (b)      Until the Senior Obligations are paid in full in cash
and notwithstanding anything contained in the Junior Debt Documents, the Lease
Agreement or the other Senior Obligations Documents to the contrary, the Junior
Creditors shall not, without the prior written consent of Lessor, agree to any
amendment, modification or supplement to the Junior Debt Documents which (i)
increases the maximum principal amount of the Junior Debt or rate of interest on
any of the Junior Debt, (ii) makes more restrictive or adds any event of default
or any covenant with respect to the Junior Debt, (iii) changes the redemption or
prepayment provisions of the Junior Debt, (iv) alters the subordination
provisions with respect to the Junior Debt, including, without limitation,
subordinating the Junior Debt to any other debt, (v) changes the maturity date
of any of the Junior Debt or otherwise alters the repayment terms of the Junior
Debt, (vi) grants any liens or security interests in any assets of the Company
(other than any such liens or security interests in effect on the date hereof)
or (vii) changes or amends any other term of the Junior Debt Documents if such
change or amendment would result in a "Lease Default" or "Lease Event of
Default" under the Lease Agreement, materially increase the obligations of the
Company or confer additional material rights on the Junior Creditors or any
other holder of the Junior Debt in a manner adverse to the Company or Lessor.

                           2.6      INCORRECT PAYMENTS. If any payment or
distribution on account of the Junior Debt not permitted to be made by the
Company or received by any Junior Creditor under this Agreement is received by
such Junior Creditor before all Senior Obligations are paid in full such payment
or distribution shall not be commingled with any asset of such Junior Creditor,
shall be held in trust by such Junior Creditor for the benefit of Lessor and
shall be promptly paid over to Lessor, or Lessor's designated representative,
for application (in accordance with the Lease Agreement) to the payment of the
Senior Obligations then remaining unpaid, until all of the Senior Obligations
are paid in full.

                           2.7      SALE, TRANSFER, ETC. No Junior Creditor
shall sell, assign, pledge, dispose of or otherwise transfer all or any portion
of the Junior Debt (a) without giving prior written notice of such action to
Lessor, (b) unless prior to the consummation of any such action, the transferee
thereof shall execute and deliver to Lessor an agreement substantially identical
to this Agreement, providing for the continued subordination and forbearance of
the Junior Debt to the Senior Obligations as provided herein and for the
continued effectiveness of all of the rights of Lessor arising under this
Agreement and (c) unless such sale, assignment, pledge, disposition or other
transfer is permitted under the terms of the Junior Debt Documents.
Notwithstanding the failure to execute or deliver any such agreement, the
subordination effected hereby shall survive any sale, assignment, pledge,
disposition or other transfer of all or any portion of the Junior Debt, and the
terms of this Agreement shall be binding upon the successors and assigns of the
Junior Creditors, as provided in Section 15 below.

                           2.8      LEGENDS. Until the Senior Obligations are
paid in full in cash, at the option of Lessor, the Junior Notes shall contain in
a conspicuous manner the following legend:

<PAGE>
                                      -8-

         "This Note and the indebtedness evidenced hereby are subordinate, in
         the manner and to the extent set forth in the Subordination and
         Amendment Agreement dated as of April 6, 2001 among Geokinetics Inc.
         and the other parties thereto. Each holder of this Note, by its
         acceptance hereof, shall be bound by the provisions of the
         Subordination and Amendment Agreement."

                           2.9      NO CONTEST BY JUNIOR CREDITORS. Each Junior
Creditor agrees that it will not at any time contest the validity, perfection,
priority or enforceability of the Senior Obligations, the Senior Obligations
Documents, or the liens and security interests of Lessor in the collateral
securing the Senior Obligations.

                  3.       MODIFICATIONS TO SENIOR OBLIGATIONS. Lessor may at
any time from time to time without the consent of or notice to the Junior
Creditors, without incurring liability to the Junior Creditors and without
impairing or releasing the obligations of the Junior Creditors under this
Agreement, change the manner or place of payment or extend the time of payment
of or renew or alter any Senior Obligations in respect of the Lease Agreement,
or amend in any manner any agreement, note, guaranty or other instrument
evidencing or securing or otherwise relating to any Senior Obligations in
respect of the Lease Agreement; PROVIDED, that any such amendment that (i)
increases the maximum amount of the Senior Obligations, (ii) shortens the
maturity date for payment of the Senior Obligations or (iii) amends any of the
other economic terms of the Lease Agreement in a manner which could reasonably
be expected to be adverse to the Junior Creditors, shall require the consent of
the majority in interest of the Non-Affiliated Noteholders.

                  4.       CONTINUED EFFECTIVENESS OF THIS AGREEMENT. The terms
of this Agreement, the subordination effected hereby, and the rights and the
obligations of the Junior Creditors or Lessor arising hereunder, shall not be
affected, modified or impaired in any manner or to any extent by: (a) any
amendment or modification of or supplement to the Lease Agreement, any of the
other Senior Obligations Documents or any of the Junior Debt Documents made in
accordance with this Agreement; (b) the validity or enforceability of any of
such documents; or (c) any exercise or non-exercise of any right, power or
remedy under or in respect of the Senior Obligations or the Junior Debt or any
of the instruments or documents referred to in clause (a) above. The Junior
Creditors and each holder of Junior Debt hereby acknowledge that the provisions
of this Agreement are intended to be enforceable at all times, whether before
the commencement of, after the commencement of, in connection with or premised
on the occurrence of a Proceeding.

                  5.       REPRESENTATIONS AND WARRANTIES OF JUNIOR CREDITORS.
Each Junior Creditor, as to itself, hereby severally represents and warrants to
Lessor as follows:

                           5.1      EXISTENCE AND POWER. If not a natural
person, such Junior Creditor is a corporation, partnership or limited liability
company duly organized, validly existing and in good standing under the laws of
the state of its organization.

                           5.2      AUTHORITY. Such Junior Creditor has full
power and authority to enter into, execute, deliver and carry out the terms of
this Agreement, all of which have been duly authorized by all proper and
necessary action and are not prohibited by its constituent documents.

<PAGE>
                                      -9-

                           5.3      BINDING AGREEMENTS. This Agreement, when
executed and delivered, will constitute the valid and legally binding obligation
of such Junior Creditor enforceable in accordance with its terms, except as such
enforceability may be limited by applicable bankruptcy, insolvency,
reorganization, moratorium or similar laws affecting the enforcement of
creditors' rights generally and by equitable principles.

                           5.4      CONFLICTING AGREEMENTS; LITIGATION. No
provisions of any mortgage, indenture, contract, agreement, statute, rule,
regulation, judgment, decree or order binding on such Junior Creditor conflicts
with, or requires any consent, which has not already been obtained under, or
would in any way prevent the execution, delivery or performance of the terms of
this Agreement by such Junior Creditor.

                           5.5      TITLE. Such Junior Creditor is the current
owner and holder of the Junior Notes set forth on SCHEDULE 1 hereto free
and clear of any liens, security interests or other encumbrances (other than the
provisions of this Agreement).

                  6.       REPRESENTATIONS AND WARRANTIES OF LESSOR. Lessor,
hereby represents and warrants to the Junior Creditors, as follows:

                           6.1      EXISTENCE AND POWER. Lessor is a limited
partnership duly organized, validly existing and in good standing under the laws
of the State of Delaware.

                           6.2      AUTHORITY. Lessor has full power and
authority to enter into, execute, deliver and carry out the terms of this
Agreement, all of which have been duly authorized by all proper and necessary
action and are not prohibited by its constituent documents.

                           6.3      BINDING AGREEMENTS. This Agreement, when
executed and delivered, will constitute the valid and legally binding obligation
of Lessor enforceable in accordance with its terms, except as such
enforceability may be limited by applicable bankruptcy, insolvency,
reorganization, moratorium or similar laws affecting the enforcement of
creditors' rights generally and by equitable principles.

                           6.4      CONFLICTING AGREEMENTS; LITIGATION. No
provisions of any mortgage, indenture, contract, agreement, statute, rule,
regulation, judgment, decree or order binding on Lessor conflicts with, or
requires any consent, which has not already been obtained under, or would in any
way prevent the execution, delivery or performance of the terms of this
Agreement by Lessor.

                           6.5      TITLE. Lessor is the current owner and
holder of the Senior Obligations free and clear of any liens, security interests
or other encumbrances (other than the provisions of this Agreement).

                  7.       AMENDMENT AND WAIVER.

                           7.1      JUNIOR NOTES AND INDENTURE. The Junior
Creditors hereby waive all Defaults or Events of Default (as such terms are
defined in the Indenture), if any, which have occurred

<PAGE>
                                      -10-

under the Junior Notes or the Indenture through the date of this Agreement, and
the Junior Creditors and the Company hereby (i) amend the Indenture to delete
Section 4.27 (Cash Maintenance) in its entirety, (ii) amend the 2002 Notes and
the Indenture by changing the 2002 Maturity Date (as defined in the Indenture)
to September 15, 2003, (iii) amend the 2002 Notes, the 2005 Notes and the
Indenture to permit the Company to pay interest on each Interest Payment Date
(as defined in the Indenture) to but not including the applicable Maturity Date
(as defined in the Indenture) in the form of Cash Interest (as defined in the
Indenture) or PIK Interest (as defined in the Indenture) under Section 2.12
(Payment of Interest; Defaulted Interest) of the Indenture and Paragraph 2
(Interest) of each of the Junior Notes, and (iv) amend the Junior Notes and the
Indenture by replacing Section 9.02 of the Indenture (incorporated in paragraph
12 of the Junior Notes) in its entirety with the following:

         "SECTION 9.02.WITH CONSENT OF HOLDERS.

                  (a)      Subject to Section 6.07, the Company and the
         Guarantors, when authorized by a Board Resolution, and the Trustee,
         together, with the written consent of the Holder or Holders of at least
         a majority in aggregate principal amount of the outstanding Notes, may
         amend or supplement this Indenture, the Notes, any Guarantee or any
         Security Document, without notice to any other Holders. Subject to
         Section 6.07, the Holder or Holders of a majority in aggregate
         principal amount of the outstanding Notes may waive compliance by the
         Company or the Guarantors with any provision of this Indenture, the
         Notes, the Guarantees or the Security Documents without notice to any
         other Holder.

                  (b)      No amendment, supplement or waiver, including a
         waiver pursuant to Section 6.04, shall, without the consent of each
         Holder of each Note affected thereby other than MHR Capital Partners LP
         and its Affiliates ("MHR") (PROVIDED that the consent of MHR under this
         Section 9.02(b) shall be required (i) if (a) MHR is then a Holder of
         2005 Notes and (b) such amendment, supplement or waiver could
         reasonably be expected to (x) adversely affect MHR's rights or
         liabilities in a manner materially different than the rights of other
         Holders of 2005 Notes (except with respect to the voting rights/consent
         provisions contained in any instruments into which 2005 Notes may be
         converted, exercised or exchanged for or into or this Indenture or the
         2005 Notes, as such may be amended or supplemented, which in all cases
         may be similar or no less favorable to MHR in all material respects to
         those set forth in this Section 9.02(b)) or (y) create an obligation
         for MHR to contribute additional funds, or (ii) to the extent otherwise
         required by the TIA if this Indenture is then required to be qualified
         under the TIA):

                           (1)      reduce the amount of Notes whose Holders
                  must consent to an amendment;

                           (2)      reduce the rate of or change or have the
                  effect of changing the time for payment of interest, including
                  defaulted interest, on any Notes;

<PAGE>
                                      -11-

                           (3)      reduce the principal of or change or have
                  the effect of changing the fixed maturity of any Notes, or
                  change the date on which any Notes may be subject to
                  redemption or repurchase, or reduce the redemption or
                  repurchase price therefor;

                           (4)      make any Notes payable in money other than
                  that stated in the Notes;

                           (5)      make any change in provisions of this
                  Indenture protecting the right of each Holder to receive
                  payment of principal of and interest on such Note or Guarantee
                  on or after the due date thereof or to bring suit to enforce
                  such payment, or permitting Holders of a majority in principal
                  amount of Notes to waive Defaults or Events of Default, other
                  than ones with respect to the payment of principal of or
                  interest on the Notes;

                           (6)      amend, modify, change or waive any provision
                  of this Section 9.02;

                           (7)      amend, modify or change in any material
                  respect the obligation of the Company to make or consummate a
                  Change of Control Offer in the event of a Change of Control or
                  make and consummate a Net Proceeds Offer in respect of any
                  Asset Sale that has been consummated or modify any of the
                  provisions or definitions with respect thereto after a Change
                  of Control has occurred or the subject Asset Sale has been
                  consummated;

                           (8)      release any Guarantor from any of its
                  obligations under its Guarantee or this Indenture otherwise
                  than in accordance with the terms hereof;

                           (9)      modify Article Eleven or the definitions
                  used in Article Eleven to adversely affect the Holders of the
                  Notes in any material respect;

                           (10)     after the original issuance date of the
                  Notes, amend, modify, change or waive the priority in right of
                  payment of the Holders of the 2002 Notes set forth in Sections
                  3.02, 4.15, 4.16 and 6.10; or

                           (11)     effect a recapitalization of securities of
                  the Company or a merger, including but not limited to the
                  conversion or exchange of the 2005 Notes into or for equity or
                  other debt securities of the Company or a successor thereto or
                  any other Person.

                           It shall not be necessary for the consent of the
         Holders under this Section 9.02 to approve the particular form of any
         proposed amendment, supplement or waiver, but it shall be sufficient if
         such consent approves the substance thereof.

<PAGE>
                                      -12-

                           After an amendment, supplement or waiver under this
         Section 9.02 becomes effective, the Company shall mail to the Holders
         affected thereby a notice briefly describing the amendment, supplement
         or waiver. Any failure of the Company to mail such notice, or any
         defect therein, shall not, however, in any way impair or affect the
         validity of any such supplemental indenture."

                           7.2      WARRANT AGREEMENT. The Junior Creditors and
Geokinetics, Inc. hereby amend the Warrant Agreement by replacing Section 15
(Supplements and Amendments) in its entirety with the following:

                  "SECTION 15.      SUPPLEMENTS AND AMENDMENTS. The Company may
         from time to time supplement or amend this Agreement without the
         approval of any holders of Warrant Certificates in order to cure any
         ambiguity or to correct or supplement any provision contained herein
         which may be defective or inconsistent with any other provision herein,
         or to make any other provisions in regard to matters or questions
         arising hereunder which the Company may deem necessary or desirable and
         which shall not in any way adversely affect the interests of the
         holders of Warrant Certificates. Any amendment or supplement to this
         Agreement that has an adverse effect on the interests of holders shall
         require the written consent of registered holders of two-thirds of the
         then outstanding Warrant Shares issued or issuable upon exercise of the
         Warrants (excluding Warrant Shares held by the Company or any of its
         Affiliates). The consent of each holder of a Warrant affected other
         than MHR Capital Partners LP and its Affiliates ("MHR") (PROVIDED that
         the consent of MHR under this Section 15 shall be required if (a) MHR
         is then a holder of 2005 Warrants and (b) such amendment or supplement
         could reasonably be expected to (x) adversely affect MHR's rights or
         liabilities in a manner materially different than the rights of other
         holders of 2005 Warrants (except with respect to the voting
         rights/consent provisions contained in any instruments into which 2005
         Warrants may be converted, exercised or exchanged for or into or this
         Agreement or the 2005 Warrants, as such may be amended or supplemented,
         which in all cases may be similar or no less favorable to MHR in all
         material respects to those set forth in this Section 15) or (y) create
         an obligation for MHR to contribute additional funds (other than the
         payment of the Exercise Price applicable to all holders of 2005
         Warrants)) shall be required for any amendment pursuant to which the
         number of Warrant Shares purchasable upon exercise of Warrants would be
         decreased (other than in accordance with Section 10 or 11 hereof)."

                  8.       CUMULATIVE RIGHTS, NO WAIVERS. Each and every right,
remedy and power granted to Lessor hereunder shall be cumulative and in addition
to any other right, remedy or power specifically granted herein, in the Lease
Agreement or the other Senior Obligations Documents or now or hereafter existing
in equity, at law, by virtue of statute or otherwise, and may be exercised by
Lessor, from time to time, concurrently or independently and as often and in
such order as Lessor may deem expedient. Any failure or delay on the part of
Lessor in exercising any such right, remedy or power, or abandonment or
discontinuance of steps to enforce the same, shall not operate as a waiver

<PAGE>
                                      -13-

thereof or affect the rights of Lessor thereafter to exercise the same, and any
single or partial exercise of any such right, remedy or power shall not preclude
any other or further exercise thereof or the exercise of any other right, remedy
or power, and no such failure, delay, abandonment or single or partial exercise
of the rights of Lessor hereunder shall be deemed to establish a custom or
course of dealing or performance among the parties hereto.

                  9.       MODIFICATION. Any modification or waiver of any
provision of this Agreement shall not be effective in any event unless the same
is in writing and signed by Lessor and the majority in interest of the Junior
Creditors (including the majority in interest of such Junior Creditors that are
Non-Affiliated Noteholders), and then such modification or waiver shall be
effective only in the specific instance and for the specific purpose given. Any
notice to or demand on the Junior Creditors in any event not specifically
required of Lessor hereunder shall not entitle the Junior Creditors to any other
or further notice or demand in the same, similar or other circumstances unless
specifically required hereunder.

                  10.      VOTING RIGHTS. IO agrees that upon any vote of
holders of Junior Debt and/or Warrants it shall vote all of its interests in
such Junior Debt and/or Warrants in accordance with the votes cast by at least
66-2/3% of the interests in such Junior Debt and/or Warrants voted by Third
Party Holders (the "VOTING RIGHTS"); PROVIDED, that IO shall not be required to
vote its interests under this Section 10 in any manner that would materially
adversely affect its rights as a holder of 2002 Notes relative to the rights of
other holders of 2002 Notes. IO agrees that the grant of the Voting Rights is
irrevocable and deemed coupled with an interest.

                  11.      ADDITIONAL DOCUMENTS AND ACTIONS. The Junior
Creditors at any time, and from time to time, after the execution and delivery
of this Agreement, promptly will execute and deliver such documents and do such
further acts and things as Lessor reasonably may request that may be necessary
in order to effect fully the purposes of this Agreement.

                  12.      SUBROGATION TO RIGHTS OF LESSOR. Subject to the
payment in full of all Senior Obligations, the Junior Creditors shall be
subrogated to the rights of Lessor to receive payments and distributions of
cash, property and securities applicable to the Senior Obligations to the extent
that distributions otherwise payable to the Junior Creditors have been applied
to the Senior Obligations, until all amounts payable under the Junior Debt shall
have been paid in full. For purposes of such subrogation, no payments or
distributions to Lessor of any cash, property or securities to which the Junior
Creditors would be entitled except for the provisions of this Agreement, and no
payments over pursuant to the provisions of this Agreement to Lessor by the
Junior Creditors shall, as among the Company, its creditors other than Lessor
and the Junior Creditors, be deemed to be a payment or distribution by the
Company to or on account of the Senior Obligations.

                  13.      NOTICES. Unless otherwise specifically provided
herein, any notice or other communication required or permitted to be given
shall be in writing addressed to the respective party as set forth below and may
be personally served, telecopied or sent by overnight courier service or United
States mail certified or registered and shall be deemed to have been given (a)
if delivered in person, when delivered; (b) if delivered by telecopy, on the
date of transmission if transmitted on a

<PAGE>
                                      -14-

business day before 4:00 p.m. (New York time) or, if not, on the next succeeding
business day; (c) if delivered by overnight courier, two business days after
delivery to such courier properly addressed; or (d) if by United States mail,
four business days after deposit in the United States mail, postage prepaid and
properly addressed.

                  Notices shall be addressed as follows:

                  (a)      If to the Junior Creditors, to their addresses set
                           forth on SCHEDULE 1 hereto:

                  (b)      If to the Company:

                           Geokinetics Inc.
                           8401 Westheimer, Suite 150
                           Houston, Texas  77063
                           Attention:  Chief Financial Officer
                           Telecopy:  (713) 850-7330

                           with a copy to:

                           Chamberlain, Hrdlicka, White, Williams & Martin
                           1200 Smith Street, Suite 1400
                           Houston, Texas  77002-4310
                           Attention:  James J. Spring III, Esq.
                           Telecopy:  (713) 658-2553

                  (c)      If to Lessor:

                           GeoLease Partners, L.P.
                           c/o DLJ Merchant Banking Partners II, Inc.
                           277 Park Avenue
                           New York, New York  10172
                           Attention:  General Counsel
                           Telecopy:  (212) 892-7551

                           with a copy to:

                           Cahill Gordon & Reindel
                           80 Pine Street
                           New York, New York  10005
                           Attention:  John Schuster, Esq.
                           Telecopy:  (212) 269-5420

or in any case, to such other address as the party addressed shall have
previously designated by written notice to the serving party, given in
accordance with this Section 13. A notice not given as pro-

<PAGE>
                                      -15-

vided above shall, if it is in writing, be deemed given if and when actually
received by the party to whom given.

                  14.      SEVERABILITY. In the event that any provision of this
Agreement is deemed to be invalid, illegal or unenforceable by reason of the
operation of any law or by reason of the interpretation placed thereon by any
court or governmental authority, the validity, legality and enforceability of
the remaining provisions of this Agreement shall not in any way be affected or
impaired thereby, and the affected provision shall be modified to the minimum
extent permitted by law so as most fully to achieve the intention of this
Agreement.

                  15.      SUCCESSORS AND ASSIGNS. This Agreement shall inure to
the benefit of the successors and assigns of Lessor and shall be binding upon
the successors and assigns of the Junior Creditors and the Company.

                  16.      COUNTERPARTS. This Agreement may be executed in one
or more counterparts, each of which shall be an original, but all of which taken
together shall be one and the same instrument.

                  17.      DEFINES RIGHTS OF CREDITORS. The provisions of this
Agreement are solely for the purpose of defining the relative rights of the
Junior Creditors and Lessor and shall not be deemed to create any rights or
priorities in favor of any other Person, including, without limitation, the
Company. Nothing contained in this Agreement or in the Junior Debt Documents or
elsewhere is intended to or shall (a) impair, as among the Company, its
creditors other than Lessor and the Junior Creditors, the obligation of the
Company, which is absolute and unconditional, to pay to each Junior Creditor the
Junior Debt as and when the same shall become due and payable, all in accordance
with the terms hereof, or (b) affect the relative rights against the Company of
the Junior Creditors and other creditors of the Company, or (c) prevent the
Junior Creditors from exercising all remedies otherwise permitted by applicable
law upon default under the Junior Notes, subject to the limitations upon such
rights set forth under this Agreement for the benefit of Lessor.

                  18.      CONFLICT. In the event of any conflict between any
term, covenant or condition of this Agreement and any term, covenant or
condition of any of the Junior Notes or the Junior Debt Documents, the
provisions of this Agreement shall control and govern.

                  19.      HEADINGS. The paragraph headings used in this
Agreement are for convenience only and shall not affect the interpretation of
any of the provisions hereof.

                  20.      TERMINATION. This Agreement shall terminate upon the
indefeasible payment in full in cash of the Senior Obligations and the
termination of the Lease Agreement.

                  21.      APPLICABLE LAW.  This Agreement shall be governed by,
and be construed and interpreted in accordance with, the internal laws (as
opposed to conflict of laws provisions) of the State of New York.

<PAGE>
                                      -16-

                  22.      CONSENT TO JURISDICTION AND SERVICE OF PROCESS. EACH
JUNIOR CREDITOR AND THE COMPANY HEREBY CONSENT TO THE JURISDICTION OF ANY STATE
OR FEDERAL COURT LOCATED IN THE COUNTY OF NEW YORK, STATE OF NEW YORK AND
IRREVOCABLY AGREE THAT, SUBJECT TO ELECTION BY LESSOR, ALL ACTIONS OR
PROCEEDINGS ARISING OUT OF OR RELATING TO THIS AGREEMENT, THE JUNIOR NOTES, THE
JUNIOR DEBT DOCUMENTS OR THE SENIOR OBLIGATIONS DOCUMENTS SHALL BE LITIGATED IN
SUCH COURTS. EACH JUNIOR CREDITOR AND THE COMPANY ACCEPTS FOR ITSELF AND IN
CONNECTION WITH ITS PROPERTIES, GENERALLY AND UNCONDITIONALLY, THE NON-EXCLUSIVE
JURISDICTION OF THE AFORESAID COURTS AND WAIVES ANY DEFENSE OF FORUM NON
CONVENIENS, AND, SUBJECT TO ITS RIGHT TO APPEAL, IRREVOCABLY AGREES TO BE BOUND
BY ANY JUDGMENT RENDERED THEREBY IN CONNECTION WITH THIS AGREEMENT, THE JUNIOR
NOTES, THE JUNIOR DEBT DOCUMENTS OR THE SENIOR OBLIGATIONS DOCUMENTS. NOTHING
HEREIN SHALL LIMIT THE RIGHT OF LESSOR TO BRING PROCEEDINGS AGAINST THE JUNIOR
CREDITORS OR THE COMPANY IN THE COURTS OF ANY OTHER JURISDICTION.

                  23.      WAIVER OF JURY TRIAL. EACH JUNIOR CREDITOR, THE
COMPANY AND LESSOR HEREBY WAIVES ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE
OF ACTION BASED UPON OR ARISING OUT OF THIS AGREEMENT, ANY OF THE JUNIOR DEBT
DOCUMENTS OR SENIOR OBLIGATIONS DOCUMENTS, OR ANY DEALINGS AMONG THE PARTIES TO
THIS AGREEMENT RELATING TO THE SUBJECT MATTER OF THE TRANSACTIONS CONTEMPLATED
BY THIS AGREEMENT, THE SENIOR OBLIGATIONS DOCUMENTS AND THE JUNIOR DEBT
DOCUMENTS. THE SCOPE OF THIS WAIVER IS INTENDED TO BE ALL ENCOMPASSING OF ANY
AND ALL DISPUTES THAT MAY BE FILED IN ANY COURT AND THAT RELATE TO THE SUBJECT
MATTER OF THIS TRANSACTION, INCLUDING WITHOUT LIMITATION, CONTRACT CLAIMS, TORT
CLAIMS, BREACH OF DUTY CLAIMS, AND ALL OTHER COMMON LAW AND STATUTORY CLAIMS.
EACH JUNIOR CREDITOR, LESSOR AND THE COMPANY ACKNOWLEDGES THAT THIS WAIVER IS A
MATERIAL INDUCEMENT TO ENTER INTO A BUSINESS RELATIONSHIP, THAT EACH HAS ALREADY
RELIED ON THIS WAIVER IN ENTERING INTO THE SENIOR OBLIGATIONS DOCUMENTS AND THIS
AGREEMENT AND THAT EACH WILL CONTINUE TO RELY ON THIS WAIVER IN ITS RELATED
DEALINGS. EACH JUNIOR CREDITOR, LESSOR AND THE COMPANY FURTHER WARRANTS AND
REPRESENTS THAT IT HAS REVIEWED THIS WAIVER WITH ITS LEGAL COUNSEL, AND THAT IT
KNOWINGLY AND VOLUNTARILY WAIVES ITS JURY TRIAL RIGHTS FOLLOWING CONSULTATION
WITH LEGAL COUNSEL. THIS WAIVER IS IRREVOCABLE, MEANING THAT IT MAY NOT BE
MODIFIED EITHER ORALLY OR IN WRITING (UNLESS SUCH WRITING MAKES SPECIFIC
REFERENCE TO THIS SECTION 23), AND THIS WAIVER SHALL APPLY TO ANY SUBSEQUENT
AMENDMENTS, RENEWALS, SUPPLEMENTS OR MODIFICATIONS TO THIS AGREEMENT, THE SENIOR
OBLIGATIONS DOCUMENTS, THE JUNIOR NOTES, THE JUNIOR DEBT DOCUMENTS, OR TO ANY
OTHER DOCUMENTS OR AGREEMENTS RELATING TO THE SENIOR OBLIGATIONS OR THE JUNIOR
DEBT. IN THE

<PAGE>
                                      -17-

EVENT OF LITIGATION, THIS AGREEMENT MAY BE FILED AS A WRITTEN CONSENT TO A TRIAL
BY THE COURT.

                [Remainder of this page intentionally left blank]

<PAGE>

                  IN WITNESS WHEREOF, Junior Creditors, the Company and Lessor
have caused this Agreement to be executed as of the date first above written.

                             JUNIOR CREDITORS:

                             DLJ INVESTMENT PARTNERS, L.P.

                             By:  DLJ INVESTMENT PARTNERS, INC.,
                                    its General Partner

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

                             DLJ INVESTMENT FUNDING, INC.

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

                             DLJ ESC II L.P.

                             By: DLJ LBO PLANS MANAGEMENT
                                    CORPORATION, its General Partner

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

                             SPINDRIFT PARTNERS, L.P.

                             By:  WELLINGTON MANAGEMENT
                                    COMPANY, LLP, its Investment Advisor

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

<PAGE>

                             SPINDRIFT INVESTORS (BERMUDA) L.P.

                             By:  WELLINGTON MANAGEMENT
                                    COMPANY, LLP, its Investment Advisor

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

                             J.P. MORGAN (BHCA), L.P. (as successor to
                               CHASE EQUITY ASSOCIATES, L.P.)

                             By:  JPMP MASTER FUND MANAGER, L.P.,
                                    its General Partner

                             By:  JPMP CAPITAL CORP., its General Partner

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

                             INPUT/OUTPUT, INC.

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

                             MHR CAPITAL PARTNERS LP

                             By:  MHR ADVISORS LLC

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

<PAGE>

                             Paul B. Loyd, Jr.

                             By:
                                 -------------------------------------------
                                Name:  Paul B. Loyd, Jr.

                             WHITTIER VENTURES LLC

                             By:
                                 -------------------------------------------
                                Name:  David A. Dahl
                                Title:  President

                             SOMERSET CAPITAL PARTNERS

                             By:
                                 -------------------------------------------
                                Name:  William R. Ziegler
                                Title:  General Partner

                             Steven A. Webster

                             By:
                                 -------------------------------------------
                                Name:  Steven A. Webster

                             William R. Ziegler

                             By:
                                 -------------------------------------------
                                Name:  William R. Ziegler

                             LEVANT AMERICA S.A.

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

<PAGE>

                             ANS LTD.

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

                             SPICEWOOD FAMILY PARTNERS

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

                             Charles E. Murphy, Jr.

                             By:
                                 -------------------------------------------
                                Name:  Charles E. Murphy, Jr.

                             Albert Stickney

                             By:
                                 -------------------------------------------
                                Name:  Albert Stickney

                             Susan Stickney

                             By:
                                 -------------------------------------------
                                Name:  Susan Stickney

                             Amy & George Goldstein Joint Tenant

                             By:
                                 -------------------------------------------
                                Name:  Amy Goldstein

                             By:
                                 -------------------------------------------
                                Name:  George Goldstein

<PAGE>

                             Lawrence Goldstein

                             By:
                                 -------------------------------------------
                                Name:  Lawrence Goldstein

                             Paul Majane

                             By:
                                 -------------------------------------------
                                Name:  Paul Majane

                             Gary N. Ross

                             By:
                                 -------------------------------------------
                                Name:  Gary N. Ross

                             David King

                             By:
                                 -------------------------------------------
                                Name:  David King

                             THE COMPANY:

                             GEOKINETICS INC.

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

                             GEOPHYSICAL DEVELOPMENT
                               CORPORATION

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

<PAGE>

                             QUANTUM GEOPHYSICAL, INC.

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

                             GEOKINETICS PRODUCTION CO.,
                               INC.

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

                             GEOSCIENCE SOFTWARE SOLUTIONS,
                               INC.

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

                             SIGNATURE GEOPHYSICAL SERVICES,
                               INC.

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

                             LESSOR:

                             GEOLEASE PARTNERS, L.P.

                             By:  GEOLEASE GP, INC.,
                                    its General Partner

                             By:
                                --------------------------------------------
                                Name:  Douglas Mark Ladden
                                Title:  President

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