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                                                                   EXHIBIT 10.18

                                    Amendment
                                       To
                Apache Corporation Money Purchase Retirement Plan

         Apache Corporation ("Apache") maintains the Apache Corporation Money
Purchase Retirement Plan (the "Plan"). In section 9.4 of the Plan, Apache
reserved the right to amend the Plan from time to time. Apache hereby exercises
such right by adding the following paragraph 3.1(a)(iv) to the Plan, effective
as of January 1, 1998.

                  (iv) Special Allocation for 1998. In addition to the
         allocation provided in paragraph (ii), the two eligible Participants
         who had the smallest "plan year compensation" (as defined below) in
         1998 shall receive an additional allocation of Company Mandatory
         Contributions equal to 3.138% of the eligible Participant's plan year
         compensation in 1998. For purposes of this paragraph only, "plan year
         compensation" means those amounts reported as "wages, tips, other
         compensation" on Form W-2 by the Company or an Affiliated Entity and
         elective contributions that are not includable in the Employee's income
         pursuant to Code section 125 or 402(e)(3).

                     EXECUTED this 21st day of October 1999.

                                       APACHE CORPORATION

                                       By: /s/ Daniel L. Schaeffer
                                          ------------------------------------
                                       Title: Vice President, Human Resources
                                             ---------------------------------

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                                    Amendment
                                       To
                Apache Corporation Money Purchase Retirement Plan

         Apache Corporation ("Apache") maintains the Apache Corporation Money
Purchase Retirement Plan (the "Plan"). Apache filed the Plan with the IRS on
September 15, 1998 in order to obtain a favorable determination as to the
qualified status of the Plan. The IRS granted the Plan a favorable determination
letter dated July 23, 1999, contingent on certain amendments being made to the
Plan. In section 9.4 of the Plan, Apache reserved the right to amend the Plan
from time to time. Apache hereby exercises such right as follows, effective as
of January 1, 1997.

1.       Section 1.12 shall be replaced in its entirety by the following.

         1.12 "Covered Employee" means any Employee of the Company, with the
         following exceptions.

                  (a) Any individual directly employed by an entity other than
         the Company shall not be a Covered Employee, even if such individual is
         considered a common-law employee of the Company or is treated as an
         employee of the Company pursuant to Code section 414(n).

                  (b) A non-resident alien shall not be a Covered Employee.

                  (c) An Employee included in a unit of Employees covered by a
         collective bargaining agreement shall not be a Covered Employee unless
         the collective bargaining agreement specifically provides for such
         Employee's participation in the Plan.

                  (d) An Employee whose job is classified as "temporary" shall
         be a Covered Employee only after he or she has worked for the Company
         and Affiliated Entities for six consecutive months.

                  (e) An Employee shall not be a Covered Employee while he or
         she is classified as an "intern," a "consultant," or an "independent
         contractor." An Employee may be classified as an "intern" only if he or
         she is currently enrolled (or the Company expects him or her to be
         enrolled within the next 12 months) in a high school, college, or
         university. An Employee may be classified as an intern even if he or
         she does not receive academic course credit from his or her school for
         this employment with the Company.

                  (f) An individual who is employed pursuant to a written
         agreement with an agency or other third party for a specific job
         assignment or project shall not be a Covered Employee.

2.       The last sentence of section 1.16 shall be replaced by the following
sentence.

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         The term "Employee" shall also include any individual who provides
         services to the Company or an Affiliated Entity pursuant to an
         agreement between the Company or an Affiliated Entity and a third party
         that employs the individual, but only if the individual has performed
         such services for the Company or an Affiliated Entity on a
         substantially full-time basis for at least one year and only if the
         services are performed under the primary direction or control by the
         Company or an Affiliated Entity; provided, however, that if the
         individuals included as Employees pursuant to the first part of this
         sentence constitute 20% or less of the Non-Highly Compensated Employees
         of the Company and Affiliated Entities, then any such individuals who
         are covered by a qualified plan that is a money purchase pension plan
         that provides a nonintegrated employer contribution rate for each
         participant of at least 10% of compensation, that provides for full and
         immediate vesting, and that provides immediate participation for each
         employee of the third party (other than those who perform substantially
         all of their services for the third party and other than those whose
         compensation from the third party during each of the four preceding
         plan years was less than $1000) shall not be considered an Employee.

3.       Section 1.20 shall be replaced in its entirety by the following.

         1.23 "Highly Compensated Employee" means, for each Plan Year, an
         Employee who (a) had Compensation of $80,000 (as adjusted by the
         Secretary of the Treasury) or more during the immediately preceding
         Plan Year, or (b) is a Five-Percent Owner during the current Plan Year,
         or (c) was a Five-Percent Owner during the immediately preceding Plan
         Year. The term "Highly Compensated Employee" shall also include, where
         the context so requires, any former Employee who was a Highly
         Compensated Employee when he or she separated from service with the
         Company and all Affiliated Entities, as well as any former Employee who
         was a Highly Compensated Employee at any time after attaining age 55.

4.       Subsection 6.1(c) shall be replaced in its entirety by the following.

                  (c) Waiver of QPSA.

                           (i) General. In order for the QPSA to be waived, the
                  Participant must be provided with an explanation of the QPSA
                  and then elect to waive the QPSA (which the Participant may do
                  by naming a beneficiary other than his or her Spouse) and the
                  Spouse must consent to the Participant's election.

                           (ii) Spouse's Consent. The Spouse's consent must be
                  in writing. The Spouse's signature must be witnessed by a
                  Committee member of by a notary public. The Spouse must
                  acknowledge the effect of the consent. The Spouse may limit
                  his or her consent to a specific beneficiary or may allow the
                  Participant to thereafter

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                  designate a different beneficiary. The Spouse may limit his or
                  her consent to a specific form of benefit. (The Spouse's
                  consent is not needed if the Spouse cannot be located or in
                  certain other special circumstances identified in IRS
                  guidance.)

                           (iii) Timing of Waiver. The Participant may waive the
                  QPSA, or revoke the QPSA waiver, at any time; however, if the
                  Participant elects to waive the QPSA, with the consent of his
                  or her Spouse, before the first day of the Plan Year in which
                  the Participant attains age 35, the waiver shall become
                  invalid on the first day of the Plan Year in which the
                  Participant attains age 35.

                           (iv) Explanation. The Committee shall provide the
                  Participant with a written explanation that describes the
                  terms and conditions of the QPSA, the Participant's right to
                  choose another beneficiary, the rights of the Participant's
                  Spouse to insist upon a QPSA, and the Participant's right to
                  revoke his or her election. The written explanation must be
                  provided within the following time limits. If the Participant
                  terminates employment prior to age 35, the explanation must be
                  provided within the period beginning one year before and
                  ending one year after the termination of employment. If the
                  Participant terminates employment on or after age 35, the
                  explanation must be provided within the one of the following
                  periods (whichever period ends last): (i) the period beginning
                  on the first day of the Plan Year in which the Participant
                  attains age 32 and ending on the last day of the Plan Year in
                  which the Participant attains age 34; (ii) the period
                  beginning one year before, and ending one year after, the
                  Participant first becomes eligible to participate in the Plan;
                  and (iii) the period beginning one year before, and ending one
                  year after, a married Participant is fully or partially vested
                  in his or her Account (which will normally occur either when
                  the Participant gets married or when the Participant completes
                  one Year of Service).

5.        Paragraphs 6.3(a)(iii) and 6.3(a)(iv) shall be replaced in their
entirety by the following.

                           (iii) Method of Spouse's Consent. The consent of a
                  Participant's Spouse must be in writing. The consent is not
                  valid unless the Committee has provided the written
                  explanation described in paragraph (iv). The Spouse must
                  acknowledge the affect of his or her consent. The Spouse's
                  consent must be witnessed by a Committee member or by a notary
                  public. The Spouse may limit his or her consent to a specific
                  beneficiary or may allow the Participant to thereafter
                  designate a different beneficiary. The Spouse may limit his or
                  her consent to a specific form of

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                  benefit. (The Spouse's consent is not needed if the Spouse
                  cannot be located or in certain other special circumstances
                  identified in IRS guidance.)

                           (iv) Distribution Procedure.

                                    (A) General. The Committee shall provide the
                           Participant with a written explanation that contains
                           the information required by the Code and Treasury
                           Regulations, as explained in subparagraph (B). The
                           timing of the explanation, the consent, and the
                           distribution are discussed in subparagraph (C). The
                           Participant may revoke his or her election at any
                           time before the distribution is processed.

                                    (B) Contents of Explanation. The information
                           in the explanation shall include, at a minimum, the
                           terms and conditions of the QJSA, the Participant's
                           right to elect a single payment in lieu of a QJSA,
                           the effect of the Participant electing a single
                           payment in lieu of a QJSA, the right of the
                           Participant's Spouse to insist upon a QJSA, and the
                           Participant's right to revoke his or her distribution
                           election.

                                    (C) Timing. The explanation shall be
                           provided no more than 90 days before the annuity
                           starting date. The explanation shall be provided no
                           fewer than 30 days before the annuity starting date,
                           unless all the following conditions are satisfied (1)
                           the Participant affirmatively elects a single sum
                           distribution (and the Participant's Spouse, if any,
                           consents), (2) the explanation mentions that the
                           Participant has a right to at least 30 days to
                           consider whether to waive the QJSA and consent to a
                           single sum, and (3) the Participant is permitted to
                           revoke an affirmative distribution election until the
                           annuity starting date (or, if later, the 8th day
                           after the Participant is provided with the
                           explanation).

                                    (D) Annuity Starting Date. The annuity
                           starting date, for a single sum payment, is the date
                           the payment is processed, which may be any business
                           day. The annuity starting date for a QJSA is the day
                           as of which the annuity payments begin. The annuity
                           starting date for an annuity must be the first day of
                           a month, must occur on or after the Participant's
                           termination of employment or 65th birthday, must
                           occur after the date the explanation is provided, but
                           may precede the date the Participant provides any

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                           affirmative distribution election. In any event, the
                           first payment from the annuity shall not precede the
                           8th day after the explanation is provided.

         6. Section 5.8 shall be replaced in its entirety by the following.

                  A rehired Participant shall have two Accounts, an "old"
         Account for the contributions from his or her earlier episode of
         employment, and a "new" Account for his or her later episode of
         employment. The vested percentage applicable to such Accounts shall be
         determined pursuant to sections 5.1 and 5.6, unless an amount was
         distributed from the old Account before the Participant was rehired, in
         which case the vested percentage of the old Account, after any
         forfeiture has been restored to it, shall be determined pursuant to
         subsection 5.3(c). If a Participant becomes fully vested in both the
         old and the new Accounts, they shall be merged into a single Account.

         7. The last section 10.1 shall be replaced in its entirety by the
following.

                  Apache expects to continue the Plan indefinitely, but the
         continuance of the Plan and the payment of contributions are not
         assumed as contractual obligations. Apache may terminate the Plan or
         discontinue contributions at any time. Upon the termination of the
         Plan, each Participant's Account shall become fully vested. Upon the
         partial termination of the Plan, the Accounts of all affected
         Participants shall become fully vested. The only Participants who are
         affected by a partial termination are those whose employment with the
         Company or Affiliated Entity is terminated as a result of the corporate
         event causing the partial termination; Employees terminated for cause
         and those who leave voluntarily are not affected by a partial
         termination.

                    EXECUTED this 21st day of October, 1999.

                                     APACHE CORPORATION

                                     By: Daniel L. Schaeffer
                                        -------------------------------------
                                     Title: Vice President, Human Resources
                                           ----------------------------------

                                  Page 5 of 5<PAGE>   1
                                                                   EXHIBIT 10.23

                               APACHE CORPORATION

                             1995 STOCK OPTION PLAN

                   (AS AMENDED AND RESTATED FEBRUARY 10, 2000)

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                                TABLE OF CONTENTS
<TABLE>
<CAPTION>

                                                                                                       PAGE
                                                                                                       ----

<S>     <C>                                                                                          <C>
Section 1 - Introduction.................................................................................1

         1.1      Establishment..........................................................................1
         1.2      Purposes...............................................................................1
         1.3      Effective Date.........................................................................1

Section 2 - Definitions..................................................................................1

         2.1      Definitions............................................................................1
         2.2      Headings; Gender and Number............................................................3

Section 3 - Plan Administration..........................................................................3

Section 4 - Stock Subject to the Plan....................................................................4

         4.1      Number of Shares.......................................................................4
         4.2      Other Shares of Stock..................................................................4
         4.3      Adjustments for Stock Split, Stock Dividend, Etc.......................................4
         4.4      Dividend Payable in Stock of Another Corporation, Etc..................................5
         4.5      Other Changes in Stock.................................................................5
         4.6      Rights to Subscribe....................................................................5
         4.7      General Adjustment Rules...............................................................5
         4.8      Determination by the Committee, Etc....................................................6

Section 5 - Reorganization or Liquidation................................................................6

Section 6 - Participation................................................................................6

Section 7 - Stock Options................................................................................7

         7.1      Grant of Stock Options.................................................................7
         7.2      Stock Option Agreements................................................................7
         7.3      Stockholder Privileges................................................................12
</TABLE>

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<TABLE>

<S>     <C>                                                                                            <C>
Section 8 - Change in Control...........................................................................12

         8.1      In General............................................................................12
         8.2      Limitation on Payments................................................................13
         8.3      Definition............................................................................13

Section 9 - Rights of Employees; Participants...........................................................13

         9.1      Employment............................................................................13
         9.2      Nontransferability....................................................................13

Section 10 - General Restrictions.......................................................................14

         10.1     Investment Representations............................................................14
         10.2     Compliance with Securities Laws.......................................................14

Section 11 - Other Employee Benefits....................................................................14

Section 12 - Plan Amendment, Modification and Termination...............................................15

Section 13 - Withholding................................................................................15

         13.1     Withholding Requirement...............................................................15
         13.2     Satisfaction of Required Withholding..................................................15
         13.3     Excess Withholding....................................................................16
         13.4     Section 16 Requirements...............................................................16

Section 14 - Requirements of Law........................................................................16

         14.1     Requirements of Law...................................................................16
         14.2     Federal Securities Laws Requirements..................................................17
         14.3     Governing Law.........................................................................17

Section 15 - Duration of the Plan.......................................................................17
</TABLE>

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                               APACHE CORPORATION

                             1995 STOCK OPTION PLAN

                                    SECTION 1

                                  INTRODUCTION

1.1 Establishment. Apache Corporation, a Delaware corporation (hereinafter
referred to, together with its Affiliated Corporations (as defined in Section
2.1 hereof) as the "Company" except where the context otherwise requires),
hereby establishes the Apache Corporation 1995 Stock Option Plan (the "Plan")
for certain key employees of the Company. The Plan permits the grant of stock
options to certain key employees of the Company.

1.2 Purposes. The purposes of the Plan are to provide the key management
employees selected for participation in the Plan with added incentives to
continue in the long-term service of the Company and to create in such employees
a more direct interest in the future success of the operations of the Company by
relating incentive compensation to increases in stockholder value, so that the
income of the key management employees is more closely aligned with the
interests of the Company's stockholders. The Plan is also designed to attract
key employees and to retain and motivate participating employees by providing an
opportunity for investment in the Company.

1.3 Effective Date. The Effective Date of the Plan (the "Effective Date") shall
be May 4, 1995. This Plan and each option granted hereunder is conditioned on
and shall be of no force or effect until approval of the Plan by the holders of
the shares of voting stock of the Company unless the Company, on the advice of
counsel, determines that stockholder approval is not necessary. The Committee
(as defined in Section 2.1 hereof) may grant options the exercise of which shall
be expressly subject to the condition that the Plan shall have been approved by
the stockholders of the Company.

                                    SECTION 2

                                   DEFINITIONS

2.1 Definitions. The following terms shall have the meanings set forth below:

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         (a) "Affiliated Corporation" means any corporation or other entity
(including but not limited to a partnership) which is affiliated with Apache
Corporation through stock ownership or otherwise and is treated as a common
employer under the provisions of Sections 414(b) and (c) or any successor
section(s) of the Internal Revenue Code.

         (b) "Board" means the Board of Directors of the Company.

         (c) "Committee" means the Stock Option Plan Committee of the Board,
which is empowered hereunder to take actions in the administration of the Plan.
The Committee shall be constituted at all times as to permit the Plan to comply
with: (i) Rule 16b-3 or any successor rule(s) promulgated under the Securities
Exchange Act of 1934, as amended (the "1934 Act"), and (ii) Section 162(m) or
any successor section(s) of the Internal Revenue Code and the regulations
promulgated thereunder.

         (d) "Deferred Delivery Plan" means the Company's Deferred Delivery
Plan, effective as of February 10, 2000 and as it may be amended from time to
time, or any successor plan.

         (e) "Depositary Shares" means the depositary shares representing the
Company's preferred stock convertible into Stock.

         (f) "Eligible Employees" means those full-time key employees
(including, without limitation, officers and directors who are also employees)
of the Company or any division thereof, upon whose judgment, initiative and
efforts the Company is, or will become, largely dependent for the successful
conduct of its business.

         (g) "Fair Market Value" means the closing price of the Stock as
reported on the New York Stock Exchange, Inc. Composite Transactions Reporting
System for a particular date. If there are no Stock transactions on such date,
the Fair Market Value shall be determined as of the immediately preceding date
on which there were Stock transactions.

         (h) "Internal Revenue Code" means the Internal Revenue Code of 1986, as
it may be amended from time to time.

         (i) "Option" means a right to purchase Stock at a stated price for a
specified period of time. All Options granted under the Plan shall be Options
which are not "incentive stock options" as described in Section 422 or any
successor section(s) of the Internal Revenue Code.

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         (j) "Option Price" means the price at which shares of Stock subject to
an Option may be purchased, determined in accordance with subsection 7.2(b)
hereof.

         (k) "Participant" means an Eligible Employee designated by the
Committee from time to time during the term of the Plan to receive one or more
Options under the Plan.

         (l) "Stock" means the $1.25 par value Common Stock of the Company.

2.2 Headings; Gender and Number. The headings contained in the Plan are for
reference purposes only and shall not affect in any way the meaning or
interpretation of the Plan. Except when otherwise indicated by the context, the
masculine gender shall also include the feminine gender, and the definition of
any term herein in the singular shall also include the plural.

                                    SECTION 3

                               PLAN ADMINISTRATION

The Plan shall be administered by the Committee. In accordance with the
provisions of the Plan, the Committee shall, in its sole discretion, select the
Participants from among the Eligible Employees, determine the Options to be
granted pursuant to the Plan, the number of shares of Stock to be issued
thereunder, the time at which such Options are to be granted, fix the Option
Price, and establish such other terms and requirements as the Committee may deem
necessary, or desirable and consistent with the terms of the Plan. The Committee
shall determine the form or forms of the agreements with Participants which
shall evidence the particular provisions, terms, conditions, rights and duties
of the Company and the Participants with respect to Options granted pursuant to
the Plan, which provisions need not be identical except as may be provided
herein. The Committee may from time to time adopt such rules and regulations for
carrying out the purposes of the Plan as it may deem proper and in the best
interests of the Company. The Committee may correct any defect, supply any
omission or reconcile any inconsistency in the Plan, or in any agreement entered
into hereunder, in the manner and to the extent it shall deem expedient and it
shall be the sole and final judge of such expediency. No member of the Committee
shall be liable for any action or determination made in good faith. The
determination, interpretations and other actions of the Committee pursuant to
the provisions of the Plan shall be binding and conclusive for all purposes and
on all persons.

The Plan is intended to comply with the requirements of Section 162 or any
successor section(s) of the Internal Revenue Code ("Section 162") as to any
"covered employee" as defined in Section 162, and shall be administered,
interpreted and construed consistently

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therewith. In accordance with this intent, the amount of income a Participant
may receive from Options granted under the Plan shall be based solely on an
increase in the value of the Stock after the date of the grant of the Option, or
such other bases as may be permitted by applicable law. The Committee is
authorized to take such additional action, if any, that may be required to
ensure that the Plan satisfies the requirements of Section 162 and the
regulations promulgated or revenue rulings published thereunder.

                                    SECTION 4

                            STOCK SUBJECT TO THE PLAN

4.1 Number of Shares. Subject to Section 7.1 and to adjustment pursuant to
Section 4.3 hereof, two million five hundred thousand (2,500,000) shares of
Stock are authorized for issuance under the Plan in accordance with the
provisions of the Plan and subject to such restrictions or other provisions as
the Committee may from time to time deem necessary. This authorization may be
increased from time to time by approval of the Board and the stockholders of the
Company if, in the opinion of counsel for the Company, such stockholder approval
is required. Shares of Stock which may be issued upon exercise of Options shall
be applied to reduce the maximum number of shares of Stock remaining available
for use under the Plan. The Company shall at all times during the term of the
Plan and while any Options are outstanding retain as authorized and unissued
Stock, or as Stock in the Company's treasury, at least the number of shares from
time to time required under the provisions of the Plan, or otherwise assure
itself of its ability to perform its obligations hereunder.

4.2 Other Shares of Stock. Any shares of Stock that are subject to an Option
which expires, is forfeited, is cancelled, or for any reason is terminated
unexercised, and any shares of Stock that for any other reason are not issued to
a Participant or are forfeited shall automatically become available for use
under the Plan.

4.3 Adjustments for Stock Split, Stock Dividend, Etc. If the Company shall at
any time increase or decrease the number of its outstanding shares of Stock or
change in any way the rights and privileges of such shares by means of the
payment of a Stock dividend or any other distribution upon such shares payable
in Stock, or through a Stock split, subdivision, consolidation, combination,
reclassification or recapitalization involving the Stock, then in relation to
the Stock that is affected by one or more of the above events, the numbers,
rights and privileges of the following shall be increased, decreased or changed
in like manner as if they had been issued and outstanding, fully paid and
nonassessable at the time of such occurrence: (i) the shares of Stock as to
which Options may be granted under the Plan; and (ii) the shares of the Stock
then included in each outstanding Option granted hereunder.

                                       4
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4.4 Dividend Payable in Stock of Another Corporation, Etc. If the Company shall
at any time pay or make any dividend or other distribution upon the Stock
payable in securities or other property (except money or Stock), a proportionate
part of such securities or other property shall be set aside and delivered to
any Participant then holding an Option for the particular type of Stock for
which the dividend or other distribution was made, upon exercise thereof. Prior
to the time that any such securities or other property are delivered to a
Participant in accordance with the foregoing, the Company shall be the owner of
such securities or other property and shall have the right to vote the
securities, receive any dividends payable on such securities, and in all other
respects shall be treated as the owner. If securities or other property which
have been set aside by the Company in accordance with this Section are not
delivered to a Participant because an Option is not exercised, then such
securities or other property shall remain the property of the Company and shall
be dealt with by the Company as it shall determine in its sole discretion.

4.5 Other Changes in Stock. In the event there shall be any change, other than
as specified in Sections 4.3 and 4.4 hereof, in the number or kind of
outstanding shares of Stock or of any stock or other securities into which the
Stock shall be changed or for which it shall have been exchanged, and if the
Committee shall in its discretion determine that such change equitably requires
an adjustment in the number or kind of shares subject to outstanding Options or
which have been reserved for issuance pursuant to the Plan but are not then
subject to an Option, then such adjustments shall be made by the Committee and
shall be effective for all purposes of the Plan and on each outstanding Option
that involves the particular type of stock for which a change was effected.

4.6 Rights to Subscribe. If the Company shall at any time grant to the holders
of its Stock rights to subscribe pro rata for additional shares thereof or for
any other securities of the Company or of any other corporation, there shall be
reserved with respect to the shares then under Option to any Participant of the
particular class of Stock involved the Stock or other securities which the
Participant would have been entitled to subscribe for if immediately prior to
such grant the Participant had exercised his entire Option. If, upon exercise of
any such Option, the Participant subscribes for the additional shares or other
securities, the Option Price shall be increased by the amount of the price that
is payable by the Participant for such additional shares or other securities.

4.7 General Adjustment Rules. No adjustment or substitution provided for in this
Section 4 shall require the Company to sell a fractional share of Stock under
any Option, or otherwise issue a fractional share of Stock, and the total
substitution or adjustment with respect to each Option shall be limited by
deleting any fractional share. In the case of any such substitution or
adjustment, the total Option Price for the shares of Stock then subject to the
Option shall remain unchanged but the Option Price per share under each such

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Option shall be equitably adjusted by the Committee to reflect the greater or
lesser number of shares of Stock or other securities into which the Stock
subject to the Option may have been changed.

4.8 Determination by the Committee, Etc. Adjustments under this Section 4 shall
be made by the Committee, whose determinations with regard thereto shall be
final and binding upon all parties thereto.

                                    SECTION 5

                          REORGANIZATION OR LIQUIDATION

In the event that the Company is merged or consolidated with another corporation
and the Company is not the surviving corporation, or if all or substantially all
of the assets or more than 20 percent of the outstanding voting stock of the
Company is acquired by any other corporation, business entity or person, or in
case of a reorganization (other than a reorganization under the United States
Bankruptcy Code) or liquidation of the Company, and if the provisions of Section
8 hereof do not apply, the Committee, or the board of directors of any
corporation assuming the obligations of the Company, shall, as to the Plan and
outstanding Options either (i) make appropriate provision for the adoption and
continuation of the Plan by the acquiring or successor corporation and for the
protection of any such outstanding Options by the substitution on an equitable
basis of appropriate stock of the Company or of the merged, consolidated or
otherwise reorganized corporation which will be issuable with respect to the
Stock, provided that no additional benefits shall be conferred upon the
Participants holding such Options as a result of such substitution, and the
excess of the aggregate Fair Market Value of the shares subject to the Options
immediately after such substitution over the Option Price thereof is not more
than the excess of the aggregate Fair Market Value of the shares subject to such
Options immediately before such substitution over the Option Price thereof, or
(ii) upon written notice to the Participants, provide that all unexercised
Options shall be exercised within a specified number of days of the date of such
notice or such Options will be terminated. In the latter event, the Committee
shall accelerate the vesting dates of outstanding Options so that all Options
become fully vested and exercisable prior to any such event.

                                    SECTION 6

                                  PARTICIPATION

Participants in the Plan shall be those Eligible Employees who, in the judgment
of the Committee, are performing, or during the term of their incentive
arrangement will perform, vital services in the management, operation and
development of the Company or

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an Affiliated Corporation, and significantly contribute, or are expected to
significantly contribute, to the achievement of the Company's long-term
corporate economic objectives. Participants may be granted from time to time one
or more Options; provided, however, that the grant of each such Option shall be
separately approved by the Committee, and receipt of one such Option shall not
result in automatic receipt of any other Option. Upon determination by the
Committee that an Option is to be granted to a Participant, written notice shall
be given to such person, specifying the terms, conditions, rights and duties
related thereto. Each Participant shall, if required by the Committee, enter
into an agreement with the Company, in such form as the Committee shall
determine and which is consistent with the provisions of the Plan, specifying
such terms, conditions, rights and duties. Options shall be deemed to be granted
as of the date specified in the grant resolution of the Committee, which date
shall be the date of any related agreement with the Participant. In the event of
any inconsistency between the provisions of the Plan and any such agreement
entered into hereunder, the provisions of the Plan shall govern.

                                    SECTION 7

                                  STOCK OPTIONS

7.1 Grant of Stock Options. Coincident with or following designation for
participation in the Plan, an Eligible Employee may be granted one or more
Options. Grants of Options under the Plan shall be made by the Committee. In no
event shall the exercise of one Option affect the right to exercise any other
Option or affect the number of shares of Stock for which any other Option may be
exercised, except as provided in subsection 7.2(j) hereof. During the life of
the Plan, no Eligible Employee may be granted Options which in the aggregate
pertain to in excess of 25 percent of the total shares of Stock authorized under
the Plan.

7.2 Stock Option Agreements. Each Option granted under the Plan shall be
evidenced by a written stock option agreement which shall be entered into by the
Company and the Participant to whom the Option is granted (the "Stock Option
Agreement"), and which shall contain the following terms and conditions, as well
as such other terms and conditions, not inconsistent therewith, as the Committee
may consider appropriate in each case.

         (a) Number of Shares. Each Stock Option Agreement shall state that it
covers a specified number of shares of Stock, as determined by the Committee.

                                       7
<PAGE>   11

         (b) Price. The price at which each share of Stock covered by an Option
may be purchased shall be determined in each case by the Committee and set forth
in the Stock Option Agreement, but in no event shall the price be less than the
Fair Market Value of the Stock on the date the Option is granted.

         (c) Duration of Options; Employment Required For Exercise. Each Stock
Option Agreement shall state the period of time, determined by the Committee,
within which the Option may be exercised by the Participant (the "Option
Period"). The Option Period must end, in all cases, not more than ten years from
the date an Option is granted. Except as otherwise provided in Sections 5 and 8
and subsection 7.2(d)(iv) hereof, each Option granted under the Plan shall
become exercisable in increments such that 25 percent of the Option will become
exercisable on each of the four subsequent one-year anniversaries of the date
the Option is granted, but each such additional 25-percent increment shall
become exercisable only if the Participant has been continuously employed by the
Company from the date the Option is granted through the date on which each such
additional 25-percent increment becomes exercisable.

         (d) Termination of Employment, Death, Disability, Etc. Each Stock
Option Agreement shall provide as follows with respect to the exercise of the
Option upon termination of the employment or the death of the Participant:

                  (i) If the employment of the Participant by the Company is
terminated within the Option Period for cause, as determined by the Company, the
Option shall thereafter be void for all purposes. As used in this subsection
7.2(d), "cause" shall mean a gross violation, as determined by the Company, of
the Company's established policies and procedures, provided that the effect of
this subsection 7.2(d) shall be limited to determining the consequences of a
termination and that nothing in this subsection 7.2(d) shall restrict or
otherwise interfere with the Company's discretion with respect to the
termination of any employee.

                  (ii) If the Participant retires from employment by the Company
on or after attaining age 65, the Option may be exercised by the Participant
within 36 months following his or her retirement (provided that such exercise
must occur within the Option Period), but not thereafter. In the event of the
Participant's death during such 36-month period, each Option may be exercised by
those entitled to do so in the manner referred to in (iv) below. In any such
case the Option may be exercised only as to the shares as to which the Option
had become exercisable on or before the date of the Participant's retirement.

                                       8
<PAGE>   12

                  (iii) If the Participant becomes disabled (as determined
pursuant to the Company's Long-Term Disability Plan or any successor plan),
during the Option Period while still employed, or within the three-month period
referred to in (v) below, or within the 36-month period referred to in (ii)
above, the Option may be exercised by the Participant or by his or her guardian
or legal representative, within twelve months following the Participant's
disability, or within the 36-month period referred to in (ii) if applicable and
if longer (provided that such exercise must occur within the Option Period), but
not thereafter. In the event of the Participant's death during such twelve-month
period, each Option may be exercised by those entitled to do so in the manner
referred to in (iv) below. In any such case, the Option may be exercised only as
to the shares of Stock as to which the Option had become exercisable on or
before the date of the Participant's disability.

                  (iv) In the event of the Participant's death while still
employed by the Company, each Option of the deceased Participant may be
exercised by those entitled to do so under the Participant's will or under the
laws of descent and distribution within twelve months following the
Participant's death (provided that in any event such exercise must occur within
the Option Period), but not thereafter, as to all shares of Stock which are
subject to such Option, including each 25-percent increment of the Option, if
any, which has not yet become exercisable at the time of the Participant's
death. In the event of the Participant's death within the 36-month period
referred to in (ii) above or within the twelve-month period referred to in (iii)
above, each Option of the deceased Participant that is exercisable at the time
of death may be exercised by those entitled to do so under the Participant's
will or under the laws of descent and distribution within twelve months
following the Participant's death or within the 36-month period referred to in
(ii), if applicable and if longer (provided that in any event such exercise must
occur within the Option Period). The provisions of this paragraph (iv) of
subsection 7.2(d) shall be applicable to each Stock Option Agreement as if set
forth therein word for word. Each Stock Option Agreement executed by the Company
prior to the adoption of this provision shall be deemed amended to include the
provisions of this paragraph and all Options granted pursuant to such Stock
Option Agreements shall be exercisable as provided herein.

                  (v) If the employment of the Participant by the Company is
terminated (which for this purpose means that the Participant is no longer
employed by the Company or by an Affiliated Corporation) within the Option
Period for any reason other than cause, the Participant's retirement on or after
attaining age 65, the Participant's disability or death, the Option may be
exercised by the Participant within three months following the date of such
termination (provided that such exercise must occur within the Option Period),
but not thereafter. In any such case, the Option may be exercised only as to the

                                       9
<PAGE>   13

shares as to which the Option had become exercisable on or before the date of
termination of the Participant's employment.

         (e) Transferability. Each Stock Option Agreement shall provide that the
Option granted therein is not transferable by the Participant except by will or
pursuant to the laws of descent and distribution, and that such Option is
exercisable during the Participant's lifetime only by him or her, or in the
event of the Participant's disability or incapacity, by his or her guardian or
legal representative.

         (f) Agreement to Continue in Employment. Each Stock Option Agreement
shall contain the Participant's agreement to remain in the employment of the
Company, at the pleasure of the Company, for a continuous period of at least one
year after the date of such Stock Option Agreement, at the salary rate in effect
on the date of such agreement or at such changed rate as may be fixed, from time
to time, by the Company.

         (g) Exercise, Payments, Etc.

                  (i) Each Stock Option Agreement shall provide that the method
for exercising the Option granted therein shall be by delivery to the Office of
the Secretary of the Company of written notice specifying the number of shares
of Stock with respect to which such Option is exercised and payment of the
Option Price. Such notice shall be in a form satisfactory to the Committee and
shall specify the particular Options (or portions thereof) which are being
exercised and the number of shares of Stock with respect to which the Options
are being exercised. The exercise of the Option shall be deemed effective on the
date such notice is received by the Office of the Secretary and payment is made
to the Company of the Option Price (the "Exercise Date"). If requested by the
Company, such notice shall contain the Participant's representation that he or
she is purchasing the Stock for investment purposes only and his or her
agreement not to sell any Stock so purchased in any manner that is in violation
of the Securities Act of 1933, as amended, or any applicable state law. Such
restriction, or notice thereof, shall be placed on the certificates representing
the Stock so purchased. The purchase of such Stock shall take place at the
principal offices of the Company upon delivery of such notice, at which time the
Option Price shall be paid in full by any of the methods or any combination of
the methods set forth in (iii) below.

                  (ii) Except as referenced below in connection with the
Deferred Delivery Plan, the shares of Stock to which the Participant is entitled
as a result of the exercise of the Option shall be issued by the Company and (A)
delivered by electronic means to an account designated by the Participant, or
(B) delivered to the Participant in the form of a properly executed certificate
or certificates representing such shares of Stock. If Shares of Stock and/or
Depositary Shares are used to pay all or part of the Option Price, the

                                       10
<PAGE>   14

Company shall issue and deliver to the Participant the additional shares of
Stock, in excess of the Option Price or portion thereof paid using shares of
Stock or Depositary Shares, to which the Participant is entitled as a result of
the Option exercise. If the Participant exercising an Option (x) is eligible for
participation in the Deferred Delivery Plan, (y) pays the Option Price pursuant
to (iii)(C) or (D) below, and (z) has made an irrevocable election at least six
months prior to the Exercise Date as required under the Deferred Delivery Plan,
the income resulting from the Option exercise shall be deferred into the
Participant's Deferred Delivery Plan account and no additional shares of Stock
shall be delivered to the Participant.

                  (iii) the Option Price shall be paid by any of the following
methods or any combination of the following methods:

                           (A) in cash, including the wire transfer of funds to
one of the Company's bank accounts located in the United States, with such bank
account to be designated from time to time by the Company;

                           (B) by personal, certified or cashier's check payable
to the order of the Company;

                           (C) by delivery to the Company of certificates
representing a number of shares of Stock then owned by the Participant, the Fair
Market Value (as of the Exercise Date) of which is not greater than the Option
Price of the Option being exercised, properly endorsed for transfer to the
Company; provided however, that the shares of Stock used for this purpose must
have been owned by the Participant for a period of at least six months;

                           (D) by certification or attestation to the Company of
the Participant's ownership as of the Exercise Date of the number of (1) shares
of Stock and/or (2) Depositary Shares, the Fair Market Value (as of the Exercise
Date) of which is not greater than the Option Price of the Option being
exercised; provided however, that the shares of Stock and/or Depositary Shares
used for this purpose must have been owned by the Participant for a period of at
least six months.

                           (E) by delivery to the Company of a properly executed
notice of exercise together with irrevocable instructions to a broker to
promptly deliver to the Company, by wire transfer or check as noted in (A) and
(B) above, the amount of the proceeds of the sale of all or a portion of the
Stock or of a loan from the broker to the Participant necessary to pay the
Option Price.

                                       11
<PAGE>   15

         (h) Date of Grant. An Option shall be considered as having been granted
on the date specified in the grant resolution of the Committee.

         (i) Tax Withholding. Each Stock Option Agreement shall provide that,
upon exercise of the Option, the Participant shall make appropriate arrangements
with the Company to provide for the amount of tax withholding required by
Sections 3102 and 3402 or any successor section(s) of the Internal Revenue Code
and applicable state and local income tax laws including, as provided in Section
13 hereof, payment of such taxes (A) through delivery of shares of Stock, (B) by
certification or attestation of shares of Stock or Depositary Shares, or (C) by
withholding shares of Stock otherwise issuable upon exercise of the Option.

         (j) Adjustment of Options. Subject to the provisions of Sections 4, 5,
7, 8 and 12 hereof, the Committee may make any adjustment in the number of
shares of Stock covered by, or the terms of an outstanding Option and a
subsequent granting of an Option, by amendment or by substitution for an
outstanding Option; however, except as provided in Sections 4, 5, 8 and 12
hereof, the Committee may not adjust the Option Price of any outstanding Option.
Such amendment or substitution may result in terms and conditions (including the
number of shares of Stock covered, vesting schedule or Option Period) that
differ from the terms and conditions of the original Option. The Committee may
not, however, adversely affect the rights of any Participant to previously
granted Options without the consent of such Participant. If such action is
effected by amendment, the effective date of grant of such amendment will be the
date of grant of the original Option.

7.3 Stockholder Privileges. No Participant shall have any rights as a
stockholder with respect to any shares of Stock covered by an Option until the
Participant becomes the holder of record of such Stock. Except as provided in
Section 4 hereof, no adjustments shall be made for dividends or other
distributions or other rights as to which there is a record date preceding the
date on which such Participant becomes the holder of record of such Stock.

                                    SECTION 8

                                CHANGE IN CONTROL

8.1 In General. In the event of a change in control of the Company as defined in
Section 8.3 hereof, then the Committee may, in its sole discretion, without
obtaining stockholder approval, to the extent permitted in Section 12 hereof,
take any or all of the following actions: (a) accelerate the dates on which any
outstanding Options become exercisable or make all such Options fully vested and
exercisable; (b) grant a cash bonus

                                       12
<PAGE>   16

award to any Participant in an amount necessary to pay the Option Price of all
or any portion of the Options then held by such Participant; (c) pay cash to any
or all Participants in exchange for the cancellation of their outstanding
Options in an amount equal to the difference between the Option Price of such
Options and the greater of the tender offer price for the underlying Stock or
the Fair Market Value of the Stock on the date of the cancellation of the
Options; and (d) make any other adjustments or amendments to the outstanding
Options.

8.2 Limitation on Payments. If the provisions of this Section 8 would result in
the receipt by any Participant of a payment within the meaning of Section 280G
or any successor section(s) of the Internal Revenue Code, and the regulations
promulgated thereunder, and if the receipt of such payment by any Participant
would, in the opinion of independent tax counsel of recognized standing selected
by the Company, result in the payment by such Participant of any excise tax
provided for in Sections 280G and 4999 or any successor section(s) of the
Internal Revenue Code, then the amount of such payment shall be reduced to the
extent required, in the opinion of independent tax counsel, to prevent the
imposition of such excise tax; provided, however, that the Committee, in its
sole discretion, may authorize the payment of all or any portion of the amount
of such reduction to the Participant.

8.3 Definition. For purposes of the Plan, a "change in control" shall mean any
of the events specified in the Company's Income Continuance Plan or any
successor plan which constitute a change in control within the meaning of such
plan.

                                    SECTION 9

                        RIGHTS OF EMPLOYEES, PARTICIPANTS

9.1 Employment. Nothing contained in the Plan or in any Option granted under the
Plan shall confer upon any Participant any right with respect to the
continuation of his or her employment by the Company or any Affiliated
Corporation, or interfere in any way with the right of the Company or any
Affiliated Corporation, subject to the terms of any separate employment
agreement to the contrary, at any time to terminate such employment or to
increase or decrease the level of the Participant's compensation from the level
in existence at the time of the grant of an Option. Whether an authorized leave
of absence, or absence in military or government service, shall constitute a
termination of employment shall be determined by the Committee at the time.

9.2 Nontransferability. No right or interest of any Participant in an Option
granted pursuant to the Plan shall be assignable or transferable during the
lifetime of the Participant, either voluntarily or involuntarily, or subjected
to any lien, directly or

                                       13
<PAGE>   17

indirectly, by operation of law, or otherwise, including execution, levy,
garnishment, attachment, pledge or bankruptcy. In the event of a Participant's
death, a Participant's rights and interests in Options shall, to the extent
provided in Section 7 hereof, be transferable by testamentary will or the laws
of descent and distribution, and payment of any amounts due under the Plan shall
be made to, and exercise of any Options may be made by, the Participant's legal
representatives, heirs or legatees. If in the opinion of the Committee, a person
entitled to payments or to exercise rights with respect to the Plan is disabled
from caring for his or her affairs because of mental condition, physical
condition or age, payment due such person may be made to, and such rights shall
be exercised by, such person's guardian, conservator or other legal personal
representative upon furnishing the Committee with evidence satisfactory to the
Committee of such status.

                                   SECTION 10

                              GENERAL RESTRICTIONS

10.1 Investment Representations. The Company may require a Participant, as a
condition of exercising an Option, to give written assurances in substance and
form satisfactory to the Company and its counsel to the effect that such person
is acquiring the Stock subject to the Option for his own account for investment
and not with any present intention of selling or otherwise distributing the
same, and to such other effects as the Company deems necessary or appropriate in
order to comply with federal and applicable state securities laws.

10.2 Compliance with Securities Laws. Each Option shall be subject to the
requirement that, if at any time counsel to the Company shall determine that the
listing, registration or qualification of the shares of Stock subject to such
Option upon any securities exchange or under any state or federal law, or the
consent or approval of any governmental or regulatory body, is necessary as a
condition of, or in connection with, the issuance or purchase of shares of Stock
thereunder, such Option may not be accepted or exercised in whole or in part
unless such listing, registration, qualification, consent or approval shall have
been effected or obtained on conditions acceptable to the Committee. Nothing
herein shall be deemed to require the Company to apply for or to obtain such
listing, registration, qualification, consent or approval.

                                   SECTION 11

                            OTHER EMPLOYEE BENEFITS

The amount of any income deemed to be received by a Participant as a result of
the exercise of an Option shall not constitute "earnings" or "compensation" with
respect to which any other employee benefits of such Participant are determined,
including without limitation benefits under any pension, profit sharing, life
insurance or salary continuation plan.

                                       14
<PAGE>   18

                                   SECTION 12

                  PLAN AMENDMENT, MODIFICATION AND TERMINATION

The Board may at any time terminate, and from time to time may amend or modify
the Plan provided, however, that no amendment or modification may become
effective without approval of the amendment or modification by the Company's
stockholders if stockholder approval is required to enable the Plan to satisfy
any applicable statutory or regulatory requirements, or if the Company, on the
advice of counsel, determines that stockholder approval is otherwise necessary
or desirable.

No amendment, modification or termination of the Plan shall in any manner
adversely affect any Option theretofore granted under the Plan, without the
consent of the Participant holding such Option.

                                   SECTION 13

                                   WITHHOLDING

13.1 Withholding Requirement. The Company's obligations to deliver shares of
Stock upon the exercise of an Option, or to defer income resulting from an
Option exercise into the Deferred Delivery Plan, shall be subject to the
Participant's satisfaction of all applicable federal, state and local income and
other tax withholding requirements.

13.2 Satisfaction of Required Withholding. At the time the Committee grants an
Option, it may, in its sole discretion, grant the Participant an election to pay
all such amounts of required tax withholding, or any part thereof:

         (a) by the delivery to the Company of a number of shares of Stock then
owned by the Participant, the Fair Market Value (as of the Exercise Date) of
which is not greater than the amount required to be withheld, provided that such
shares have been held by the Participant for a period of at least six months;

         (b) by certification or attestation to the Company of the Participant's
ownership as of the Exercise Date of a number of shares of Stock and/or
Depositary Shares, the Fair Market Value (as of the Exercise Date) of which is
not greater than the amount required

                                       15
<PAGE>   19
to be withheld, provided that such shares of Stock and/or Depositary Shares have
been owned by the Participant for a period of at least six months; or

         (c) by the Company withholding from the shares of Stock otherwise
issuable to the Participant upon exercise of the Option, a number of shares of
Stock, the Fair Market Value (as of the Exercise Date) of which is not greater
than the amount required to be withheld. Any such elections by Participants to
have shares of Stock withheld for this purpose will be subject to the following
restrictions:

                  (i) all elections shall be made on or prior to the Exercise
Date; and

                  (ii) all elections shall be irrevocable.

13.3 Excess Withholding. At the time the Committee grants an Option, it may, in
its sole discretion, grant the Participant an election to pay additional or
excess amounts of tax withholding, beyond the required amounts and up to the
Participant's marginal tax rate:

         (a) by delivery to the Company of a number of Shares of Stock then
owned by the Participant, the Fair Market Value (as of the Exercise Date) of
which is not greater than such excess withholding amount, provided that such
shares of Stock have been owned by the Participant for a period of at least six
months; or

         (b) by certification or attestation to the Company of the Participant's
ownership as of the Exercise Date of a number of shares of Stock and/or
Depositary Shares, the Fair Market Value (as of the Exercise Date) of which is
not greater than such excess withholding amount, provided that such shares of
Stock and/or Depositary Shares have been owned by the Participant for a period
of at least six months.

13.4 Section 16 Requirements. If the Participant is an officer or director of
the Company within the meaning of Section 16 or any successor section(s) of the
1934 Act ("Section 16"), the Participant must satisfy the requirements of such
Section 16 and any applicable rules and regulations thereunder with respect to
the use of shares of Stock and/or Depositary Shares to satisfy such tax
withholding obligation.

                                   SECTION 14

                               REQUIREMENTS OF LAW

14.1 Requirements of Law. The issuance of Stock and the payment of cash pursuant
to the Plan shall be subject to all applicable laws, rules and regulations.

                                       16
<PAGE>   20

14.2 Federal Securities Laws Requirements. If a Participant is an officer or
director of the Company within the meaning of Section 16, Options granted
hereunder shall be subject to all conditions required under Rule 16b-3, or any
successor rule(s) promulgated under the 1934 Act, to qualify the Option for any
exception from the provisions of Section 16 available under such Rule. Such
conditions are hereby incorporated herein by reference and shall be set forth in
the agreement with the Participant which describes the Option.

14.3 Governing Law. The Plan and all Stock Option Agreements hereunder shall be
construed in accordance with and governed by the laws of the State of Texas.

                                   SECTION 15

                              DURATION OF THE PLAN

The Plan shall terminate at such time as may be determined by the Board, and no
Option shall be granted after such termination. If not sooner terminated under
the preceding sentence, the Plan shall fully cease and expire at midnight on May
4, 2000. Options outstanding at the time of the Plan termination shall continue
to be exercisable in accordance with the Stock Option Agreement pertaining to
such Option.

Dated:    February 10, 2000

                                           APACHE CORPORATION

ATTEST:

/s/ Cheri L. Peper                         By:      /s/ Daniel L. Schaeffer
-----------------------                             ----------------------------
Cheri L. Peper                                      Daniel L. Schaeffer
Corporate Secretary                                 Vice President

                                       17

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