Exhibit 10.1
                                  AMENDMENT TO
                             CORE LABORATORIES N.V.
                          1995 LONG-TERM INCENTIVE PLAN
             (As Amended and Restated Effective as of May 29, 1997)


        WHEREAS, Core Laboratories N.V. (the "Company") has heretofore
adopted the Core Laboratories N.V. 1995 Long-Term  Incentive Plan (As Amended
and Restated Effective as of May 29, 1997) (the "Plan"); and

        WHEREAS, the Company desires to amend the Plan in certain respects;

        NOW, THEREFORE, the Plan is amended hereby as follows:

        1. Effective as of May 29, 1997, the definition of the term "Committee"
        shall be deleted from Section 2 and the following shall be substituted
        therefor:

             "`Committee' means a committee or subcommittee appointed by the
           Board to administer the Plan, which committee or subcommittee shall
           be comprised solely of two or more individuals who qualify as
           "Non-Employee Directors" within the meaning of Rule 16b-3."

        2. Effective as of February 28, 2003, the text of Section 7(c) is
        deleted and replaced with the following:

         "A stock option shall become fully exercisable and
         restrictions on Restricted Shares shall lapse upon a Change in
         Control (as hereinafter defined) of the Company. Change in
         Control shall mean (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
         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
         (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."

        3. Effective as of February 28, 2003, Section 17 is deleted in its
         entirety; provided, however, this deletion of Section 17 shall not
         apply to a Participant's Awards outstanding on the effective date of
         this Amendment unless the Participant consents to the application of
         this Amendment to such Awards.

                                       2




        4. As amended hereby, the Plan is specifically ratified and reaffirmed.



                             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.

                                       3