Exhibit 10.2


                                    AMENDMENT
                              TO CORE LABORATORIES
                     SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN


        WHEREAS, Core Laboratories N.V. (the "Company") and ("Executive") have
entered into that certain Core Laboratories Supplemental Executive Retirement
Plan, as amended (the "SERP"); and

        WHEREAS, the Company and Executive desire to amend the SERP in certain
respects;

        NOW, THEREFORE, the SERP is amended hereby effective as of February 28,
2003, as follows:

        1. The text of Section 1.1(4) is amended in its entirety to read as
        follows:

           "Change in Control: Any of the following: (i) a merger of the
           Company with another entity, a consolidation involving the
           Company, or the sale of all or substantially all of the assets
           of the Company to another entity if, in any such case, (A) the
           holders of equity securities of the Company immediately prior
           to such transaction or event do not beneficially own
           immediately after such transaction or event, in substantially
           the same proportions that they owned the equity securities of
           the Company immediately prior to such transaction or event,
           50% or more of the common equity of the resulting entity, (B)
           the holders of equity securities of the Company immediately
           prior to such transaction or event do not beneficially own
           immediately after such transaction or event, in substantially
           the same proportions that they owned the equity securities of
           the Company immediately prior to such transaction or event,
           equity securities of the resulting entity entitled to 50% or
           more of the votes then eligible to be cast in the election of
           directors generally (or comparable governing body) of the
           resulting entity, or (C) the persons who were members of the
           Board immediately prior to such transaction or event shall not
           constitute at least a majority of the board of directors of
           the resulting entity immediately after such transaction or
           event, (ii) shareholder approval of a plan of dissolution or
           liquidation of the Company, (iii) when any person or entity,
           including a "group" as contemplated by Section 13(d)(3) of the
           Securities Exchange Act of 1934, as amended (the "Exchange
           Act"), (other than a trustee or other fiduciary holding
           securities under an employee benefit plan of the Company or
           any affiliate of the Company), acquires or gains ownership or
           control (including, without limitation, power to vote) of more
           than 30% of the combined voting power of the outstanding
           securities of, (A) if the Company has not engaged in a merger
           or consolidation, the Company, or (B) if the Company has
           engaged in a merger or consolidation, the resulting entity, or

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           (iv) a change in the composition of the Board, as a result of
           which fewer than a majority of the supervisory directors are
           Incumbent Directors. For purposes of the preceding sentence,
           (1) "resulting entity" in the context of a transaction or
           event that is a merger, consolidation or sale of all or
           substantially all assets shall mean the surviving entity (or
           acquiring entity in the case of an asset sale) unless the
           surviving entity (or acquiring entity in the case of an asset
           sale) is a subsidiary of another entity and the holders of
           common equity of the Company receive capital stock of such
           other entity in such transaction or event, in which event the
           resulting entity shall be such other entity, (2) subsequent to
           the consummation of a merger or consolidation that does not
           constitute a Change in Control, the term "Company" shall refer
           to the resulting entity and the term "Board" shall refer to
           the board of directors (or comparable governing body) of the
           resulting entity, and (3) "Incumbent Directors" shall mean
           directors who either (A) are directors of the Company as of
           February 28, 2003, or (B) are elected, or nominated for
           election, to the Board with the affirmative votes of at least
           two-thirds of the Incumbent Directors at the time of such
           election or nomination, but Incumbent Director shall not
           include an individual whose election or nomination occurs as a
           result of either (A) an actual or threatened election contest
           (as such terms are used in Rule 14a-11 of Regulation 14A
           promulgated under the Exchange Act) or (B) an actual or
           threatened solicitation of proxies or consents by or on behalf
           of a person other than the Board."

        2. Section 1.1 is amended by adding thereto a new paragraph (27) to read
        as follows:

           "(27)  Actuarial  Equivalent or Actuarial Equivalence:  A lump
                  sum payment that, as of the lump sum payment date, is
                  actuarially equal in value to the aggregate amounts of
                  Executive's vested accrued benefit expected to be received
                  under the annual  installment form of payment based upon
                  (i) the Applicable  Mortality  Table (as defined in section
                  417(e)(3)(A)(ii)(I)  of the Code) and (ii) using an interest
                  rate that is 80% of the applicable federal rate (determined
                  under section 1274(d) of the Code and the regulations
                  thereunder) compounded annually, for the month in which the
                  lump sum is paid."

        3. Article II is amended by adding thereto a new Section 2.6 to read as
        follows:

                  "2.6 Change in Control Lump Sum Elections. In lieu of
           the annual installment payments provided by Section 2.3,
           Executive may irrevocably elect (in such manner as proscribed
           by the Committee) to receive his accrued benefit paid in a
           single lump sum payment on or as soon as administratively
           feasible following a Change in Control. Such lump sum shall be
           an amount that is the Actuarial Equivalent of the installment
           payments that would otherwise be payable to Executive
           beginning on his Retirement Date (or if such installments have
           already commenced prior to the Change in Control, the
           Actuarial Equivalent of the remaining installments due
           Executive (or his Designated Beneficiary if he has died prior
           to the Change in Control)). Except as provided in the
           following paragraph, to be effective, the election must be
           made while the Executive is an employee or a director of the
           Company and at least one year prior to both the date of
           Executive's 65th birthday and the date of the Change in
           Control.

                  If Executive has not timely made the election
           provided in the preceding paragraph, or is not eligible to
           make such election as provided in the last sentence of such
           paragraph, then Executive (or, if deceased at the time of the
           Change in Control, his Designated Beneficiary) may irrevocably
           elect (in such manner as proscribed by the Committee) to
           receive a lump sum payment on or as soon as administratively
           feasible after the Change in Control (or, if the election is
           made following the Change in Control, as soon as
           administratively feasible after the election). The lump sum
           shall be an amount equal to 90% of the Actuarial Equivalence
           of his then accrued benefit (or, if it is already in pay
           status, the accrued benefit remaining to be paid). Upon such
           lump sum payment, the remaining portion of Executive's accrued
           benefit automatically shall be forfeited."

        4. Section 7.1 is amended in its entirety to read as follows:

                  "7.1 Amendment. The Board may, in its discretion,
           amend the Plan, in whole or in part, at any time; provided,
           however, that no amendment shall be made that would reduce the
           accrued benefit of Executive or, without Executive's written
           consent, adversely affect any of Executive's rights (vested or
           contingent) hereunder with respect to his accrued benefit,
           including, without limitation, the timing and the form of
           payment of such benefit and the definition of Actuarial
           Equivalent used to determine the lump sum present value of his
           accrued benefit."

        5. Section 7.2 is amended in its entirety to read as follows:

                  "7.2 Termination. The Board may, in its discretion,
           terminate the Plan in whole or in part at any time; provided,
           however, if Executive is then employed by the Company Group or
           any affiliate of the Company Group, he automatically shall
           acquire a 100% Vested Interest in his accrued benefit. In the

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           event the Plan is terminated, notwithstanding any other
           provision of the Plan, the Board, it its discretion, may pay
           Executive his payable but unpaid vested accrued Retirement
           Benefit (or, in the case of Executive's death, Executive's
           Designated Beneficiary any payable but unpaid Death Benefit or
           Retirement Benefit) either in accordance with Article II or
           III, as applicable, or in any other manner the Board deems
           appropriate, including, without limitation, a lump sum payment
           that is the Actuarial Equivalent of such unpaid Retirement
           Benefit or Death Benefit."

        6. As amended hereby, the SERP is specifically ratified and reaffirmed.

        IN WITNESS WHEREOF, the parties hereto have executed this Amendment
        effective for all purposes as of February 28, 2003.



                             CORE LABORATORIES N.V.
                             By Core Laboratories International B.V.,
                             its sole managing director


                             By:
                                         -----------------------------------
                                         Jacobus Schouten
                                         Managing Director of Core Laboratories
                                         International B.V.

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