APACHE CORP
DEF 14A, 1999-03-30
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1
 
                                  SCHEDULE 14A
                                 (RULE 14A-101)
 
                    INFORMATION REQUIRED IN PROXY STATEMENT
 
                            SCHEDULE 14A INFORMATION
 
          PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES
                EXCHANGE ACT OF 1934 (AMENDMENT NO.           )
 
     Filed by the Registrant [X]
     Filed by a Party other than the Registrant [ ]
     Check the appropriate box:
     [ ] Preliminary Proxy Statement       [ ] Confidential, for Use of the
                                               Commission Only (as permitted by
                                               Rule 14a-6(e)(2))
     [X] Definitive Proxy Statement
     [ ] Definitive Additional Materials
     [ ] Soliciting Material Pursuant to sec. 240.14a-11(c) or sec. 240.14a-12

                               APACHE CORPORATION
- - --------------------------------------------------------------------------------
                (Name of Registrant as Specified in its Charter)
 
- - --------------------------------------------------------------------------------
    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)
 
Payment of Filing Fee (Check the appropriate box):
     [X] No fee required.
     [ ] Fee computed on table below per Exchange Act Rules 14a-6(i)(l) and
         0-11.
 
     (1) Title of each class of securities to which transaction applies:
 
- - --------------------------------------------------------------------------------
     (2) Aggregate number of securities to which transaction applies:
 
- - --------------------------------------------------------------------------------
     (3) Per unit price or other underlying value of transaction computed
pursuant to Exchange Act Rule 0-11 (Set forth the amount on which the filing fee
is calculated and state how it was determined):
 
- - --------------------------------------------------------------------------------
     (4) Proposed maximum aggregate value of transaction:
 
- - --------------------------------------------------------------------------------
     (5) Total fee paid:
 
- - --------------------------------------------------------------------------------
 
     [ ] Fee paid previously with preliminary materials.
 
     [ ] Check box if any part of the fee is offset as provided by Exchange Act
Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid
previously. Identify the previous filing by registration statement number, or
the Form or Schedule and the date of its filing.
 
     (1) Amount Previously Paid:
 
- - --------------------------------------------------------------------------------
     (2) Form, Schedule or Registration Statement No.:
 
- - --------------------------------------------------------------------------------
     (3) Filing Party:
 
- - --------------------------------------------------------------------------------
     (4) Date Filed:
 
- - --------------------------------------------------------------------------------
<PAGE>   2
 
                                  APACHE LOGO
 
                              ONE POST OAK CENTRAL
                       2000 POST OAK BOULEVARD, SUITE 100
                           HOUSTON, TEXAS 77056-4400
 
                                                                  March 30, 1999
 
FELLOW STOCKHOLDERS:
 
I am pleased to invite you to attend the annual meeting of stockholders of
Apache Corporation to be held on Thursday, May 6, 1999, at 10:00 a.m. (Houston
time), at the Doubletree Hotel at Post Oak, 2001 Post Oak Boulevard, Houston,
Texas.
 
At the annual meeting, stockholders will be asked to vote upon the election of
four directors to the board of directors and to transact any other business that
may properly come before the meeting. In addition, we will present a brief
report to stockholders on the Company's results and direction.
 
We hope you will be able to attend the annual meeting. Whether or not you plan
to be present in person, please vote your shares promptly using one of the
methods explained in the attached proxy statement. Your participation is
appreciated and will ensure that your shares are represented at the meeting and
voted in accordance with your wishes.
 
                                         /s/ RAYMOND PLANK
                                         -----------------------------
                                             RAYMOND PLANK
                                         Chairman of the Board
                                           and Chief Executive Officer
<PAGE>   3
 
                               APACHE CORPORATION
                              ONE POST OAK CENTRAL
                       2000 POST OAK BOULEVARD, SUITE 100
                           HOUSTON, TEXAS 77056-4400
 
 ------------------------------------------------------------------------------
 
                    NOTICE OF ANNUAL MEETING OF STOCKHOLDERS
 ------------------------------------------------------------------------------
 
TO THE STOCKHOLDERS OF APACHE CORPORATION:
 
The 1999 annual meeting of stockholders of Apache Corporation, a Delaware
corporation, will be held on Thursday, May 6, 1999, at 10:00 a.m. (Houston
time), at the Doubletree Hotel at Post Oak, 2001 Post Oak Boulevard, Houston,
Texas, for the following purposes:
 
     1. To elect four directors to serve until the annual meeting of
        stockholders in 2002; and
 
     2. To transact any other business that may properly come before the meeting
        or any adjournment thereof.
 
Holders of record of the Company's common stock as of the close of business on
March 17, 1999, are entitled to notice of, and to vote at, the annual meeting.
The Company's stock transfer books will not be closed. A complete list of
stockholders entitled to vote at the annual meeting will be available for
examination by any Apache stockholder at 2000 Post Oak Boulevard, Suite 100,
Houston, Texas, for purposes relating to the annual meeting, during normal
business hours for a period of ten days before the meeting.
 
It is important that your shares are represented at the meeting. We encourage
you to designate the proxies named on the enclosed proxy card to vote your
shares on your behalf and per your instructions. This action does not limit your
right to vote in person or to attend the meeting.
 
                                         By order of the Board of Directors
 
                                         APACHE CORPORATION

                                         /s/ C. L. PEPER
                                         -------------------
                                             C. L. PEPER
                                         Corporate Secretary
 
Houston, Texas
March 30, 1999
<PAGE>   4
 
                       PROXY STATEMENT TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
General.....................................................    1
Purpose of the Annual Meeting...............................    1
Who Can Vote................................................    1
How to Vote.................................................    1
Revoking a Proxy............................................    2
Quorum and Votes Needed.....................................    2
How the Votes are Counted...................................    2
Election of Directors (Proposal No. 1)......................    2
      Nominees for Election as Directors....................    3
      Continuing Directors..................................    4
      Standing Committees and Meetings of the Board of
       Directors............................................    6
      Director Compensation.................................    7
      Voting Securities and Principal Holders...............    8
      Section 16(a) Beneficial Ownership Reporting
       Compliance...........................................   10
      Executive Officers of the Company.....................   10
      Summary Compensation Table............................   12
      Option/SAR Grants Table...............................   13
      Option/SAR Exercises and Year-End Value Table.........   15
      The Management Development and Compensation Committee
         Report on Executive Compensation...................   16
      Performance Graph.....................................   21
      Employment Contracts and Termination of Employment and
         Change-in-Control Arrangements.....................   22
      Compensation Committee Interlocks and Insider
       Participation........................................   23
      Certain Business Relationships and Transactions.......   23
Independent Public Accountants..............................   24
Stockholder Proposals.......................................   24
Solicitation of Proxies.....................................   24
</TABLE>
<PAGE>   5
 
                               APACHE CORPORATION
                              ONE POST OAK CENTRAL
                       2000 POST OAK BOULEVARD, SUITE 100
                           HOUSTON, TEXAS 77056-4400
 
                                                                  March 30, 1999
 
                                PROXY STATEMENT
 
GENERAL
 
This proxy statement contains information about the 1999 annual meeting of
stockholders of Apache Corporation. In this proxy statement "Apache" and "the
Company" both refer to Apache Corporation. This proxy statement and the enclosed
proxy card are being mailed to you by the Company's board of directors starting
on or about March 30, 1999.
 
PURPOSE OF THE ANNUAL MEETING
 
At the Company's annual meeting, stockholders will vote on the election of
directors as outlined in the accompanying notice of meeting, and on any other
business that properly comes before the meeting. As of the date of this proxy
statement, the Company is not aware of any business to come before the meeting
other than the election of directors.
 
WHO CAN VOTE
 
Only stockholders of record at the close of business on the record date, March
17, 1999, are entitled to receive notice of the annual meeting and to vote the
shares of Apache common stock they held on that date. As of March 17, 1999,
there were 97,812,383 shares of Apache common stock issued and outstanding.
Holders of Apache common stock are entitled to one vote per share and are not
allowed to cumulate votes in the election of directors. The enclosed proxy card
shows the number of shares that you are entitled to vote.
 
HOW TO VOTE
 
If your shares of Apache common stock are held by a broker, bank or other
nominee (in "street name"), you will receive instructions from them on how to
vote your shares.
 
If you hold shares of Apache common stock in your own name (as a "stockholder of
record"), you may give instructions on how your shares are to be voted by:
 
     - marking, signing, dating and returning the enclosed proxy card in the
       postage-paid envelope provided.
 
     - using the toll-free telephone number or Internet voting site listed on
       the enclosed proxy card. Specific directions for using the telephone and
       Internet voting systems are shown on the proxy card.
 
When using telephone or Internet voting, the systems verify that you are a
stockholder through the use of a company number for Apache and a unique control
number for you. If you vote by telephone or Internet, please do not mail the
enclosed proxy card.
 
Whichever of these methods you use to transmit your instructions, your shares of
Apache common stock will be voted as you direct. If you sign and return the
enclosed proxy card or otherwise designate the proxies named on the proxy card
to vote on your behalf, but do not
 
                                        1
<PAGE>   6
 
specify how to vote, your shares will be voted FOR the election of the nominees
for director. If other matters of business not presently known are properly
raised at the meeting, the proxies will vote on the matters in accordance with
their best judgment.
 
REVOKING A PROXY
 
You may revoke a proxy before it is voted by submitting a new proxy with a later
date (by mail, telephone or Internet), by voting at the meeting, or by filing a
written revocation with Apache's corporate secretary. Your attendance at the
annual meeting will not automatically revoke your proxy.
 
QUORUM AND VOTES NEEDED
 
The presence at the annual meeting, in person or by proxy, of the holders of a
majority of the shares of Apache common stock outstanding on the record date
will constitute a quorum, permitting the business of the meeting to be
conducted. The affirmative vote of a plurality of the votes cast at the annual
meeting is required for the election of directors.
 
HOW THE VOTES ARE COUNTED
 
Representatives of Norwest Bank Minnesota, N.A., will tabulate the votes and act
as inspectors of election. A properly signed proxy marked to "withhold"
authority for the election of one or more directors will be counted for quorum
purposes but not for voting purposes. If a broker indicates on a proxy that they
do not have discretionary authority to vote certain shares of Apache common
stock on a matter, those shares will not be considered present and entitled to
vote at the meeting.
 
                             ELECTION OF DIRECTORS
                         (PROPOSAL NO. 1 ON PROXY CARD)
 
The Company's bylaws provide that the board of directors shall consist of a
minimum of seven and a maximum of 13 directors. The Company's certificate of
incorporation provides that, as nearly as numerically possible, one-third of the
directors shall be elected at each annual meeting of stockholders. Unless
directors earlier resign or are removed, their terms are for three years, and
continue thereafter until their successors are elected and qualify as directors.
 
The present terms of directors G. Steven Farris, Randolph M. Ferlic, A.D.
Frazier, Jr. and John A. Kocur expire at the 1999 annual meeting. Each has been
recommended by the Company's nominating committee and nominated by the board of
directors for election by the stockholders to an additional three-year term. If
elected, each will serve beginning upon his election until the annual meeting of
stockholders in 2002.
 
Unless otherwise instructed, all proxies will be voted in favor of these
nominees. If one or more of the nominees is unwilling or unable to serve, the
proxies will be voted only for the remaining named nominees. Proxies cannot be
voted for more than four nominees. The board of directors knows of no nominee
for director who is unwilling or unable to serve.
 
                                        2
<PAGE>   7
 
                       NOMINEES FOR ELECTION AS DIRECTORS
 
Biographical information, including principal occupation and business experience
during the last five years, of each nominee for director is set forth below.
Unless otherwise stated, the principal occupation of each nominee has been the
same for the past five years.
 
<TABLE>
<CAPTION>
                                                                     DIRECTOR
                                                                       SINCE
  <S>                                                           <C>
  G. STEVEN FARRIS, 51, has been president and chief operating         1994
  officer of the Company since May 1994, and was elected to
  the Company's board of directors in December 1994. He was
  senior vice president of the Company from 1991 to 1994, and
  vice president -- exploration and production from 1988 to
  1991. Prior to that, Mr. Farris was vice president of
  finance and acquisitions for Terra Resources, Inc., a Tulsa,
  Oklahoma oil and gas company, from 1983 to 1988, and
  executive vice president for Robert W. Berry, Inc., a Tulsa,
  Oklahoma oil and gas company, from 1978 to 1983.

  RANDOLPH M. FERLIC, 62, retired in December 1993 from his            1986
  practice as a thoracic and cardiovascular surgeon. He is the
  founder of Surgical Services of the Great Plains, P.C., and
  served as its president from 1974 to 1991. Dr. Ferlic is a
  member of the audit committee, the executive committee, and
  the nominating committee.

  A. D. FRAZIER, JR., 54, became, in April 1997, president and         1997
  chief executive officer of INVESCO, Inc., a U.S. affiliate
  of AMVESCAP, PLC, a London-based independent global
  investment management firm. He joined INVESCO in November
  1996 as executive vice president and a director of INVESCO,
  PLC. Mr. Frazier was chief operating officer of the Atlanta
  Olympic Games Committee from 1991 to October 1996, and
  served as executive vice president, North American Banking
  Group, of First Chicago Corporation and First National Bank
  of Chicago from 1982 to 1991. He is also a director of
  AMVESCAP, PLC, Magellan Health Services, Inc., Atlanta,
  Georgia, and Rock-Tenn Company, a Norcross, Georgia
  manufacturer of packaging and paperboard products. Mr.
  Frazier is a member of the management development and
  compensation committee and the stock option plan committee.

  JOHN A. KOCUR, 71, is engaged in the private practice of             1977
  law. He served as vice chairman of the Company's board of
  directors from 1988 to 1991. Mr. Kocur was employed by the
  Company from 1969 until his retirement in 1991, and served
  as the Company's president from 1979 to 1988. He is chairman
  of the executive committee, chairman of the nominating
  committee, and a member of the management development and
  compensation committee.
</TABLE>
 
                                        3
<PAGE>   8
 
                              CONTINUING DIRECTORS
 
Biographical information, including principal occupation and business experience
during the last five years, for each continuing member of the board of directors
whose term is not expiring at the 1999 annual meeting is set forth below. Unless
otherwise stated, the principal occupation of each director has been the same
for the past five years.
 
<TABLE>
<CAPTION>
                                                                 DIRECTOR              TERM
                                                                   SINCE              EXPIRES
  <S>                                                       <C>                 <C>
  FREDERICK M. BOHEN, 61, has been executive vice                  1981                2000
  president and chief operating officer of The Rockefeller
  University since 1990. He was senior vice president of
  Brown University from 1983 to 1990, and served as vice
  president of finance and operations at the University of
  Minnesota from 1981 to 1983. Mr. Bohen was with the U.S.
  Department of Health, Education and Welfare as assistant
  secretary for management and budget from 1977 to 1981.
  He is a director of American Council of Learned
  Societies and chairman of its finance committee. Mr.
  Bohen is chairman of the management development and
  compensation committee and chairman of the stock option
  plan committee.

  EUGENE C. FIEDOREK, 67, has been the managing director           1988                2001
  of EnCap Investments L.C., a Dallas, Texas energy
  investment banking firm, since 1988. Mr. Fiedorek was
  the managing director of the Energy Banking Group of
  First RepublicBank Corp. in Dallas, Texas from 1978 to
  1988. He is a director of Energy Capital Investment
  Company, a U.S. oil and gas investment firm listed on
  the London Stock Exchange, and of Aviva Petroleum
  Corporation, Dallas, Texas. Mr. Fiedorek is a member of
  the audit committee.

  STANLEY K. HATHAWAY, 74, has been a senior partner in            1977                2000
  the law firm of Hathaway, Speight & Kunz LLC since 1976.
  From June through October 1975, he served as the U.S.
  Secretary of the Interior, and was Governor of the State
  of Wyoming from 1967 to 1975. Mr. Hathaway is chairman
  of the audit committee.

  GEORGE D. LAWRENCE JR., 48, is a private investor, and           1996                2000
  joined the Company's board of directors in May 1996.
  Formerly, he was president, chief executive officer and
  a director of The Phoenix Resource Companies, Inc. from
  1990 until May 1996, when Phoenix became a wholly-owned
  subsidiary of the Company. Mr. Lawrence is a member of
  the executive committee and the management development
  and compensation committee.
</TABLE>
 
                                        4
<PAGE>   9
 
<TABLE>
<CAPTION>
                                                                 DIRECTOR              TERM
                                                                   SINCE              EXPIRES
  <S>                                                       <C>                 <C>
  MARY RALPH LOWE, 52, has been president and chief                1996                2001
  executive officer of Maralo, LLC, (formerly Maralo,
  Inc.), a Houston, Texas independent oil and gas
  exploration and production company, and ranching
  operation, since 1988, and a member of its board of
  directors since 1975. Ms. Lowe is a member of the audit
  committee and the nominating committee.

  F. H. MERELLI, 62, joined the Company's board of                 1997                2001
  directors in July 1997. Since 1991, he has been chairman
  of the board, president and chief executive officer of
  Key Production Company, Inc., a Denver, Colorado
  independent oil and gas exploration and production
  company. Formerly, he served as the Company's president
  and chief operating officer from 1988 to 1991. Prior to
  that, he was president of Terra Resources, Inc., a
  Tulsa, Oklahoma oil and gas company, from 1979 to 1988.
  Mr. Merelli is a member of the executive committee.

  RAYMOND PLANK, 76, has been chairman of the board of             1954                2001
  directors and chief executive officer of the Company
  since 1979, and served as the Company's president from
  1954 to 1979. Mr. Plank is a member of the executive
  committee and the nominating committee.

  JOSEPH A. RICE, 74, retired in 1988 as chairman of the           1989                2000
  board, chief executive officer and a director of Irving
  Trust Company and Irving Bank Corporation, having served
  in those capacities since 1984. Mr. Rice served as
  president, chief operating officer and a director of
  those organizations from 1975 to 1984. He was a director
  of Avon Products, Inc. from 1982 to May 1997. Mr. Rice
  is a member of the management development and
  compensation committee and the stock option plan
  committee.
</TABLE>
 
                                        5
<PAGE>   10
 
                        STANDING COMMITTEES AND MEETINGS
                           OF THE BOARD OF DIRECTORS
 
The board of directors has an audit committee, a management development and
compensation committee, a stock option plan committee, an executive committee,
and a nominating committee. Actions taken by these committees are reported to
the board of directors at the next board meeting. During the last fiscal year,
each of the Company's directors attended at least 75 percent of all meetings of
the board of directors and of all committees of which they were members, except
A. D. Frazier, Jr. who attended 70 percent.
 
<TABLE>
<CAPTION>
- - ------------------------------------------------------------------------------------------------------------------
                                                MEMBERSHIP ROSTER
- - ------------------------------------------------------------------------------------------------------------------
 NAME                              BOARD      AUDIT      MD&C       STOCK OPTION     EXECUTIVE      NOMINATING
- - ------------------------------------------------------------------------------------------------------------------
<S>                              <C>        <C>        <C>        <C>               <C>          <C>
 Frederick M. Bohen                  X                    X*             X*
- - ------------------------------------------------------------------------------------------------------------------
 G. Steven Farris                    X
- - ------------------------------------------------------------------------------------------------------------------
 Randolph M. Ferlic                  X          X                                        X               X
- - ------------------------------------------------------------------------------------------------------------------
 Eugene C. Fiedorek                  X          X
- - ------------------------------------------------------------------------------------------------------------------
 A. D. Frazier, Jr.                  X                     X             X
- - ------------------------------------------------------------------------------------------------------------------
 Stanley K. Hathaway                 X          X*
- - ------------------------------------------------------------------------------------------------------------------
 John A. Kocur                       X                     X                             X*              X*
- - ------------------------------------------------------------------------------------------------------------------
 George D. Lawrence Jr.              X                     X                             X
- - ------------------------------------------------------------------------------------------------------------------
 Mary Ralph Lowe                     X          X                                                        X
- - ------------------------------------------------------------------------------------------------------------------
 F. H. Merelli                       X                                                   X
- - ------------------------------------------------------------------------------------------------------------------
 Raymond Plank                       X*                                                  X               X
- - ------------------------------------------------------------------------------------------------------------------
 Joseph A. Rice                      X                     X             X
- - ------------------------------------------------------------------------------------------------------------------
 No. of Meetings in 1998             6          6          6             5               0               1
- - ------------------------------------------------------------------------------------------------------------------
</TABLE>
 
* Chairperson
 
The audit committee reviews with the independent accountants and internal
auditors of the Company their respective audit and review programs and
procedures, and the scope and results of their audits. It also examines
professional services provided by the Company's independent accountants and
evaluates their costs and related fees. Additionally, the audit committee
reviews the Company's financial statements and the adequacy of the Company's
system of internal accounting controls. The audit committee makes
recommendations to the board of directors concerning the Company's independent
accountants and their engagement or discharge.
 
The management development and compensation committee reviews the Company's
management resources and structure, and administers the Company's compensation
programs and retirement, stock purchase and similar plans. The duties of the
stock option plan committee include the award and administration of option
grants under the Company's stock option plans and of conditional grants under
the Company's 1996 Share Price Appreciation Plan.
 
The executive committee is vested with the authority to exercise the full power
of the board of directors, within established policies, in the intervals between
meetings of the board of directors.
 
                                        6
<PAGE>   11
 
In addition to the general authority vested in it, the executive committee may
be vested with specific power and authority by resolution of the board of
directors.
 
The duties of the nominating committee include recommending to the board of
directors the slate of director nominees submitted to the stockholders for
election at the annual meeting, and proposing qualified candidates to fill
vacancies on the board of directors without regard to race, sex, age, religion
or physical disability.
 
Stockholders wishing to recommend candidates for consideration by the nominating
committee should forward written recommendations, together with appropriate
biographical information and details of qualifications, to Apache's corporate
secretary. In order to be considered, recommendations must be received by the
deadline for submitting stockholder proposals set forth under the heading
"Stockholder Proposals."
 
                             DIRECTOR COMPENSATION
 
Employee directors do not receive additional compensation for serving on the
board of directors or any committee of the board. During 1998, non-employee
directors received an annual retainer of $30,000, of which $10,000 value was
paid in the form of shares of Apache common stock; plus $1,000 for each board of
directors or committee meeting attended, together with reimbursement of expenses
incurred in attending meetings. Non-employee directors receive an annual
retainer of $2,000 for each committee of which they are members. In addition,
the chairman of each committee receives $4,000 annually for chairing his or her
respective committees.
 
Under the terms of the Company's non-employee directors' compensation plan, as
amended in 1998, non-employee directors can elect to defer receipt of all or any
portion of their retainers or meeting attendance fees and, subject to certain
parameters, can defer those amounts in the form of cash or in the form of shares
of Apache common stock. Amounts deferred in the form of cash accrue interest
equal to the Company's rate of return on its short-term marketable securities;
amounts deferred in the form of Apache common stock accrue dividends as if the
stock were issued and outstanding when such dividends were payable. All deferred
amounts, as well as accrued interest and dividends, are maintained in a separate
memorandum account for each participating non-employee director. Amounts are
paid out in cash and/or stock, as applicable, upon the non-employee director's
retirement or other termination of his or her directorship, or on a specific
date, in a lump sum or in annual installments over a ten-year (or shorter)
period. Three non-employee directors deferred a portion of their fees during
1998.
 
An unfunded retirement plan for non-employee directors was established in
December 1992. The plan is administered by the management development and
compensation committee and pays retired non-employee directors benefits equal to
two-thirds of the annual retainer for a period based on length of service.
Payments are made on a quarterly basis, for a maximum of ten years, and are paid
from the general assets of the Company. In the event of the director's death
prior to receipt of all benefits payable under the plan, the remaining benefits
are payable to the director's surviving spouse or designated beneficiary until
the earlier of the termination of the payment period or the death of the
surviving spouse or designated beneficiary. Benefits were paid under this plan
to three former directors who retired from the Company's board of directors
during 1997 and 1998.
 
The Company established an equity compensation plan for non-employee directors
in February 1994, which is administered by the management development and
compensation
 
                                        7
<PAGE>   12
 
committee. Each non-employee director will be awarded 1,000 restricted shares of
the Company's common stock every five years, beginning July 1, 1994. The shares
vest at a rate of 200 shares annually, with unvested shares forfeited at the
time the non-employee director ceases to be a member of the board. Awards are
made from treasury stock and are automatic and non-discretionary. New
non-employee directors will receive 1,000-share awards on the July 1 next
succeeding their election to the board. All shares awarded under the plan have
full dividend and voting rights. The plan expires July 1, 2009, with a maximum
of 50,000 shares that may be awarded during the term of the plan. On July 1,
1998, an award of 1,000 shares was made to one non-employee director who joined
the board in mid-July 1997.
 
                    VOTING SECURITIES AND PRINCIPAL HOLDERS
 
The following table sets forth, as of February 28, 1999, the beneficial
ownership of each director or nominee for director of the Company, the chief
executive officer, the four other most highly compensated executive officers,
and all directors and executive officers of the Company as a group. All
ownership information is based upon filings made by those persons with the
Securities and Exchange Commission (the "SEC") or upon information provided to
the Company.
 
<TABLE>
<CAPTION>
- - ----------------------------------------------------------------------------------------------------------------
                                                                                AMOUNT AND          PERCENT OF
                                                                           NATURE OF BENEFICIAL        CLASS
     TITLE OF CLASS                 NAME OF BENEFICIAL OWNER                   OWNERSHIP(1)         OUTSTANDING
- - ----------------------------------------------------------------------------------------------------------------
<S>                      <C>                                             <C>                       <C>
 Common Stock, par value
 $1.25                    Frederick M. Bohen                                    6,953(2)(3)           *
- - ----------------------------------------------------------------------------------------------------------------
                          G. Steven Farris                                    206,455(4)(5)           *
                          --------------------------------------------------------------------------------------
                          Randolph M. Ferlic                                  240,367(2)(6)           *
                          --------------------------------------------------------------------------------------
                          Eugene C. Fiedorek                                    7,467(2)              *
                          --------------------------------------------------------------------------------------
                          A. D. Frazier, Jr.                                    2,011(2)              *
                          --------------------------------------------------------------------------------------
                          Stanley K. Hathaway                                   8,402(2)              *
                          --------------------------------------------------------------------------------------
                          John A. Kocur                                        40,597(2)(7)           *
                          --------------------------------------------------------------------------------------
                          George D. Lawrence Jr.                              239,838(2)(3)(8)        *
                          --------------------------------------------------------------------------------------
                          Mary Ralph Lowe                                      34,367(2)              *
                          --------------------------------------------------------------------------------------
                          F. H. Merelli                                         8,299(2)(3)(5)        *
                          --------------------------------------------------------------------------------------
                          Raymond Plank                                       339,630(4)(5)           *
                          --------------------------------------------------------------------------------------
                          Joseph A. Rice                                        6,467(2)              *
                          --------------------------------------------------------------------------------------
                          Roger B. Plank                                      165,101(4)(5)           *
                          --------------------------------------------------------------------------------------
                          H. Craig Clark                                       52,699(4)(5)           *
                          --------------------------------------------------------------------------------------
                          Lisa A. Floyd                                        46,851(4)(5)           *
                          --------------------------------------------------------------------------------------
                          All directors, nominees, and executive
                          officers as a group (including the above named
                          persons)                                          1,602,612(4)(5)            1.64
- - ----------------------------------------------------------------------------------------------------------------
</TABLE>
 
 *  Represents less than one percent of the outstanding shares.
 
(1) All ownership is sole and direct unless otherwise noted. Inclusion of any
    shares not owned directly shall not be construed as an admission of
    beneficial ownership. Fractional shares have been rounded to the nearest
    whole share.
 
(2) Includes 1,000 shares of restricted stock awarded under the Company's equity
    compensation plan for non-employee directors.
 
                                         (footnotes continued on following page)
 
                                        8
<PAGE>   13
 
(3) Includes the following share equivalents related to retainer fees deferred
    under the Company's non-employee directors' compensation plan: Mr.
    Bohen -- 2,789; Mr. Lawrence -- 335; and Mr. Merelli -- 335.
 
(4) Includes the following shares issuable upon the exercise of outstanding
    employee stock options which are exercisable within 60 days: Mr.
    Farris -- 117,250; Mr. Raymond Plank -- 144,300; Mr. Roger Plank -- 86,325;
    Mr. Clark -- 45,400; Ms. Floyd -- 41,025; and all directors and executive
    officers as a group -- 599,750.
 
(5) Includes units held by the trustee of the Company's 401(k) Savings Plan
    equivalent to the following shares: Mr. Farris -- 17,871; Mr.
    Merelli -- 6,842; Mr. Raymond Plank -- 938; Mr. Roger Plank -- 14,444; Mr.
    Clark -- 7,299; Ms. Floyd -- 5,826; and all directors and executive officers
    as a group -- 84,879.
 
(6) Includes 17,500 shares owned indirectly by Dr. Ferlic through his interest
    in Surgical Services of the Great Plains, P.C. Employee Benefit Trust, and
    6,000 shares owned directly by Ferlic Investments, Ltd. in which Dr. Ferlic
    owns a 36-percent interest. Also includes a total of 5,400 shares held by
    Dr. Ferlic's daughters, son and grandchildren, as to which he disclaims
    beneficial ownership.
 
(7) Includes 3,940 shares owned by Mrs. Kocur.
 
(8) Includes 185,625 shares issuable upon the exercise of outstanding stock
    options which are fully exercisable. See "Certain Business Relationships and
    Transactions".
 
The following table sets forth the only persons known to the Company, as of
February 28, 1999, to be the owners of more than five percent of outstanding
shares of the Company's common stock, according to reports filed with the SEC:
 
<TABLE>
<CAPTION>
                                                                      AMOUNT AND NATURE
                                                                        OF BENEFICIAL     PERCENT OF CLASS
 TITLE OF CLASS                NAME AND ADDRESS OF BENEFICIAL OWNER       OWNERSHIP         OUTSTANDING
 <S>                          <C>                                    <C>                 <C>
 Common Stock,                 Merrill Lynch & Co., Inc.                8,104,293(1)            8.29
 par value $1.25               Merrill Lynch Asset Management Group
                               World Financial Center, North Tower
                               250 Vesey Street
                               New York, New York 10381

                               FMR Corp                                 5,907,545(2)(3)         6.04
                               82 Devonshire St.
                               Boston, Massachusetts 02109

                               College Retirement Equities Fund         5,285,824(4)            5.41
                               TIAA Separate Account VA-1
                               TIAA - CREF Life Funds
                               730 Third Avenue
                               New York, New York 10017
</TABLE>
 
(1) Per Schedule 13G filed with the SEC, dated January 29, 1999.
 
(2) Per Schedule 13G filed with the SEC, dated February 1, 1999.
 
(3) Does not include 1,226,760 shares held by Fidelity Management Trust Company
    ("FMTC") as trustee of the Company's 401(k) Savings Plan. FMTC is a
    wholly-owned subsidiary of FMR Corp.
 
(4) Per Schedule 13G filed with the SEC, dated February 11, 1999.
 
                                        9
<PAGE>   14
            SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE
 
Section 16(a) of the Securities Exchange Act of 1934 requires the Company's
directors and officers, as well as beneficial owners of ten percent or more of
the Company's common stock, to report their holdings and transactions in the
Company's securities. To the Company's knowledge, based on information furnished
to it and contained in reports provided pursuant to Section 16(a), as well as
written representations that no other reports were required for 1998, it appears
that Mr. Frazier, a director of the Company, filed one late report relating to a
small purchase of shares made with additional cash investments through the
Company's dividend reinvestment plan.
 
                       EXECUTIVE OFFICERS OF THE COMPANY
 
Biographical information concerning the executive officers of the Company is set
forth below. Biographical information concerning Raymond Plank and G. Steven
Farris is set forth above under the captions "Information about Nominees for
Election as Directors" and "Information about Continuing Directors."
 

- - --------------------------------------------------------------
  MICHAEL S. BAHORICH, 42, was appointed vice
  president -- exploration technology in December 1997,
  having been the Company's chief geophysicist since 1996.
  From 1981 until he joined the Company, Mr. Bahorich held
  positions of increasing responsibility at Amoco
  Corporation in Denver, Colorado and Tulsa, Oklahoma, most
  recently as a resource manager for Amoco's mid-continent
  business unit.
- - --------------------------------------------------------------
  H. CRAIG CLARK, 42, has been vice president of the
  Company's Western Region Exploration & Production and
  North America Gas Marketing since July 1998, having been
  on assignment serving as chairman and chief executive
  officer of Producers Energy Marketing LLC ("ProEnergy"),
  the Company's joint-venture natural gas marketing
  company, from October 1997 through June 1998, when
  ProEnergy was sold to Cinergy Corp. ("Cinergy"). Mr.
  Clark became a vice president of the Company in 1994,
  with responsibility for North American production from
  1994 to 1996, and for North American exploration and
  production from May 1996 through September 1997. He was
  general manager of the Company's southern division from
  1993 to 1994, and production manager of the Company's
  Gulf Coast region from 1989 to 1993.
- - --------------------------------------------------------------
  MATTHEW W. DUNDREA, 45, was appointed vice president and
  treasurer in July 1997, having been the Company's
  treasurer since March 1996 and assistant treasurer since
  1994. Prior to that, he was assistant treasurer from 1991
  to 1994, manager -- cash management from 1986 to 1991,
  and manager -- economic analysis from 1984 to 1986, for
  Union Texas Petroleum Holdings, Inc., Houston, Texas.
- - --------------------------------------------------------------
  ROBERT J. DYE, 43, was appointed vice
  president -- investor relations in May 1997, having been
  director of investor relations since 1995. Prior to that,
  Mr. Dye held positions of increasing responsibility in
  the corporate planning area since joining the Company in
  1992. Formerly, he was planning manager for the offshore
  division of BP Exploration, Houston, Texas, from 1988 to
  1992.
- - --------------------------------------------------------------
  LISA A. FLOYD, 41, has been vice president -- business
  development and E&P services since December 1998, having
  been vice president -- business development since
  September 1997, and vice president -- technical services
  since January 1995. Ms. Floyd has held positions of
  increasing responsibility in the reservoir engineering
  area since joining the Company in 1984.
- - --------------------------------------------------------------
 
                                       10
<PAGE>   15

- - --------------------------------------------------------------
  ZURAB S. KOBIASHVILI, 56, has been vice president and
  general counsel of the Company since 1994. From 1991 to
  1994, he was with Falcon Seaboard Resources, Inc., a
  privately-held company involved in the development,
  construction and operation of electric cogeneration power
  plants, and in oil and gas exploration and production,
  initially as a legal consultant and from 1993 as vice
  president and general counsel. Mr. Kobiashvili was vice
  president and general counsel for Conquest Exploration
  Company, Houston, Texas, from 1984 to 1991.
- - ---------------------------------------------------------------
  ANTHONY R. LENTINI, JR., 49, has been vice
  president -- public and international affairs since January
  1995. Prior to joining the Company, he was vice president
  of public affairs for Mitchell Energy & Development Corp.,
  The Woodlands, Texas, from 1988 through 1994.
- - ---------------------------------------------------------------
  THOMAS L. MITCHELL, 38, was appointed vice president and
  controller in July 1997, having been the Company's
  controller and chief accounting officer since February
  1996. He held various positions in the Company's natural
  gas marketing operation from 1990 through 1995, and served
  as accounting manager for the Company's Gulf Coast
  operations from 1989 to 1990. Prior to joining the Company,
  Mr. Mitchell was a manager with Arthur Andersen & Co., an
  independent public accounting firm, from 1982 through 1988.
- - ---------------------------------------------------------------
  ROGER B. PLANK, 42, was appointed vice president and chief
  financial officer in July 1997, having been vice
  president -- planning and corporate development since March
  1996 and vice president -- corporate planning since 1994.
  Prior to that, he was the Company's vice president --
  external affairs from 1993 to 1994, and vice
  president -- corporate communications from 1987 to 1993.
  The Company's chairman and chief executive officer is Mr.
  Plank's father.
- - ---------------------------------------------------------------
  FLOYD R. PRICE, 49, has been vice
  president -- international exploration and production since
  December 1994, and president of the Company's international
  exploration and production subsidiaries since May 1996. He
  served as exploration manager from 1991 to 1994, and
  geologic manager from 1990 to 1991, for the Company's
  Midcontinent Region. Prior to that, Mr. Price was vice
  president of exploration and development from 1988 to 1989,
  and vice president of mid-continent exploration from 1989
  to 1990, for Pacific Enterprises Oil Company, Dallas,
  Texas.
- - ---------------------------------------------------------------
  DANIEL L. SCHAEFFER, 49, was appointed vice
  president -- human resources in July 1997, having been
  director of human resources since 1990. He was director of
  training and organizational development for the Company
  from 1987 to 1990.
- - ---------------------------------------------------------------
  CHERI L. PEPER, 45, was appointed corporate secretary of
  the Company in May 1995, having been assistant secretary
  since 1992. Prior to joining the Company, she was assistant
  secretary for Panhandle Eastern Corporation (subsequently
  PanEnergy Corp.) since 1988.
- - ---------------------------------------------------------------

 
                                       11
<PAGE>   16
 
                           SUMMARY COMPENSATION TABLE
 
The table below summarizes the annual and long-term compensation paid to the
individuals listed below for all services rendered to the Company and its
subsidiaries during the last three fiscal years, in accordance with SEC rules
relating to disclosure of executive compensation. The persons included in this
table are the Company's chief executive officer and the four other most highly
compensated executive officers who were serving as executive officers of the
Company at year-end 1998.
 
<TABLE>
<CAPTION>
- - ---------------------------------------------------------------------------------------------------------------------------------
                                                          ANNUAL COMPENSATION           LONG-TERM COMPENSATION
                                                   ---------------------------------            AWARDS
                                                                           OTHER     -----------------------------
                                                                           ANNUAL     RESTRICTED     SECURITIES      ALL OTHER
                                                     SALARY     BONUS     COMPEN-       STOCK        UNDERLYING     COMPENSATION
NAME AND PRINCIPAL POSITION                  YEAR     ($)      ($)(1)    SATION($)    AWARDS($)   OPTIONS/SARS(#)       ($)
- - ---------------------------------------------------------------------------------------------------------------------------------
<S>                                         <C>    <C>        <C>       <C>          <C>          <C>              <C>
 Raymond Plank                               1998   750,000     65,000         0          0            42,700(2)     134,988(4)
   Chairman of the Board and                 1997   750,000    374,900         0          0            24,900(2)     138,708(4)
   Chief Executive Officer                   1996   750,000    405,900         0          0            44,800(2)     112,464(3)
- - ---------------------------------------------------------------------------------------------------------------------------------
 G. Steven Farris                            1998   529,178     60,000     6,855(6)       0(8)         35,600(2)     109,406(4)(5)
   President and Chief Operating Officer     1997   491,680    245,700     4,752(6)       0            16,600(2)      99,606(4)(5)
                                             1996   450,000    243,500         0          0            26,900(2)      66,096(3)
- - ---------------------------------------------------------------------------------------------------------------------------------
 Roger B. Plank                              1998   254,383     80,400     1,500(6)       0            21,300(2)      48,316(4)(5)
   Vice President and                        1997   226,670    113,300       902(6)       0            32,000(2)      42,490(4)(5)
   Chief Financial Officer                   1996   203,750    109,400         0          0            26,900(2)      32,646(3)
- - ---------------------------------------------------------------------------------------------------------------------------------
 H. Craig Clark(7)                           1998   215,000    115,000       896(6)       0            13,800(2)      40,786(4)(5)
   Vice President -- Western Region E&P      1997   213,333    107,000     1,234(6)       0             7,100(2)      42,957(4)(5)
   and North America Gas Marketing           1996   195,000    120,000         0          0            26,400(2)      38,400(3)
- - ---------------------------------------------------------------------------------------------------------------------------------
 Lisa A. Floyd                               1998   214,670     72,300     1,054(6)       0            13,200(2)      40,284(4)(5)
   Vice President -- Business                1997   197,500    100,000     1,157(6)       0            26,100(2)      38,328(4)(5)
   Development and E&P Services              1996   182,500     98,800         0          0            26,100(2)      29,640(3)
- - ---------------------------------------------------------------------------------------------------------------------------------
</TABLE>
 
(1) Includes amounts awarded under the Company's incentive compensation plans
    for performance in the year indicated.
 
(2) Shares of the Company's common stock subject to options awarded during 1998,
    1997 and 1996. These stock options were granted on September 17, 1998, April
    29, 1998, July 17, 1997, May 1, 1997, July 11, 1996, April 29, 1996, April
    22, 1996 and March 26, 1996 under the terms of the 1995 Stock Option Plan or
    the 1998 Stock Option Plan. There were no adjustments or amendments during
    the last fiscal year to the exercise price of stock options previously
    granted to any of the named executive officers.
 
(3) Represents Company contributions under the Company's Retirement/401(k)
    Savings Plan and related Non-Qualified Retirement/Savings Plan.
 
(4) Includes Company contributions under the Company's 401(k) Savings Plan, the
    Company's Money Purchase Retirement Plan, and related Non-Qualified
    Retirement/Savings Plan for 1998 and 1997 in the following amounts: Mr.
    Raymond Plank -- $134,988 and $138,708; Mr. Farris -- $92,985 and $88,222;
    Mr. Roger Plank -- $44,722 and $40,329; Mr. Clark -- $38,640 and $40,000;
    and Ms. Floyd -- $37,760 and $35,556.
 
(5) Includes premium for executive life insurance benefits for 1998 and 1997 in
    the following amounts: Mr. Farris -- $16,421 and $11,384; Mr. Roger
    Plank -- $3,594 and $2,161; Mr. Clark -- $2,146 and $2,957; and Ms. Floyd --
    $2,524 and $2,772.
 
(6) Amounts reimbursed for the payment of taxes relating to executive life
    insurance benefits.
 
(7) Mr. Clark was on assignment from October 1997 through June 1998, serving as
    chairman and chief executive officer of ProEnergy. See "Executive Officers
    of the Company".
 
                                         (footnotes continued on following page)
 
                                       12
<PAGE>   17
 
(8) On December 17, 1998, the Company's board of directors granted a conditional
    stock award to Mr. Farris for a total of 100,000 shares of the Company's
    common stock. The award is composed of five periodic installments,
    commencing on January 1st of each of the next five years, and vesting on the
    fifth anniversary following the applicable commencement date (subject to
    acceleration under specific circumstances). To receive each installment,
    which is payable 40 percent in cash and 60 percent in stock, Mr. Farris must
    be employed by the Company on the applicable commencement and vesting dates.
    The per share closing price of the Company's common stock for January 4,
    1999, the first business day of 1999, was $24.125, and for December 17, 1998
    was $23.875. Mr. Farris has all voting, dividend and liquidation rights for
    each installment of shares as of the applicable commencement date listed
    below:
 
        6,667 shares commencing January 1, 1999, vesting January 1, 2004
        13,333 shares commencing January 1, 2000, vesting January 1, 2005
        20,000 shares commencing January 1, 2001, vesting January 1, 2006
        26,667 shares commencing January 1, 2002, vesting January 1, 2007
        33,333 shares commencing January 1, 2003, vesting January 1, 2008
 
                            OPTION/SAR GRANTS TABLE
 
The table below provides supplemental information relating to the Company's
grants of options during 1998 to the executive officers named in the Summary
Compensation Table above, including the relative size of each grant, and each
grant's exercise price and expiration date. There were no stock appreciation
rights ("SARs") granted during the last fiscal year. Also included, in
compliance with SEC rules on disclosure of executive compensation, is
information relating to the estimated present value of the options granted,
based upon principles of the Black-Scholes option pricing model. The
Black-Scholes model utilizes numerous arbitrary assumptions about financial
variables such as interest rates, stock price volatility and future dividend
yield. Neither the option values reflected in the table nor the assumptions
utilized in arriving at the values should be considered indicative of future
stock performance.
 
                     OPTION/SAR GRANTS IN LAST FISCAL YEAR
 
<TABLE>
<CAPTION>
- - ---------------------------------------------------------------------------------------------------------------------------------
                                                              INDIVIDUAL GRANTS
                                 ----------------------------------------------------------------------------
                                     NUMBERS OF
                                     SECURITIES       PERCENT OF TOTAL
                                     UNDERLYING         OPTIONS/SARS
                                    OPTIONS/SARS         GRANTED TO        EXERCISE OR                            GRANT DATE
                                       GRANTED          EMPLOYEES IN        BASE PRICE        EXPIRATION         PRESENT VALUE
NAME                                  (#)(1)(2)          FISCAL YEAR        ($/SH)(3)            DATE               ($)(4)
- - ---------------------------------------------------------------------------------------------------------------------------------
<S>                              <C>                 <C>                 <C>              <C>                 <C>
 Raymond Plank                        42,700/0             3.44/0             35.125          04/29/2008            523,801
- - ---------------------------------------------------------------------------------------------------------------------------------
 G. Steven Farris                     35,600/0             2.86/0             35.125          04/29/2008            436,705
- - ---------------------------------------------------------------------------------------------------------------------------------
 Roger B. Plank                       14,200/0             1.14/0             35.125          04/29/2008            174,191
                                       7,100/0             0.57/0             27.000          09/17/2008             64,390
- - ---------------------------------------------------------------------------------------------------------------------------------
 H. Craig Clark                        9,200/0             0.74/0             35.125          04/29/2008            112,856
                                       4,600/0             0.37/0             27.000          09/17/2008             41,717
- - ---------------------------------------------------------------------------------------------------------------------------------
 Lisa A. Floyd                         8,800/0             0.71/0             35.125          04/29/2008            107,950
                                       4,400/0             0.35/0             27.000          09/17/2008             39,904
- - ---------------------------------------------------------------------------------------------------------------------------------
</TABLE>
 
(1) This column sets forth the number of shares of the Company's common stock
    subject to options granted on April 29, 1998 under the terms of the 1995
    Plan and on September 17, 1998 under the terms of the 1998 Plan. Options are
    generally nontransferable and become exercisable ratably over four years.
    The options were granted for a term of ten years, subject to earlier
    termination in specific circumstances related to termination of employment,
    and are not intended to qualify as incentive stock options under Section 422
    of the Internal
 
                                         (footnotes continued on following page)
 
                                       13
<PAGE>   18
 
    Revenue Code. The exercise price and any withholding tax requirements may be
    paid by cash and/or delivery of already-owned shares of the Company's common
    stock.
 
    Options granted under the 1995 Plan and the 1998 Plan are subject to
    appropriate adjustment in the event of a reorganization, stock split, stock
    dividend, combination of shares, merger, consolidation or other
    recapitalization of the Company. If there is a change in control of the
    Company, the stock option plan committee may accelerate the exercise date of
    any outstanding options; make any outstanding options fully vested and
    exercisable; grant a cash bonus award to any participant in an amount
    necessary to pay the exercise price of all or any portion of the options
    then held by the participant; 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 exercise price of the 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 cancellations; or make any
    other adjustments or amendments to the outstanding options.
 
    A change in control occurs when a person, partnership or corporation acting
    in concert, or any or all of them, acquires more than 20 percent of the
    Company's outstanding voting securities. A change in control shall not occur
    if, prior to the acquisition of more than 20 percent of the Company's voting
    securities, the Company's board of directors by majority vote designates the
    person, partnership or corporation as an approved acquirer and resolves that
    a change in control will not have occurred.
 
(2) There were no SARs granted during 1998. There were no adjustments or
    amendments during 1998 to the exercise price of stock options previously
    granted to any of the named executive officers. The 1995 Plan, the 1998 Plan
    and the 1990 Stock Incentive Plan were amended in December 1998 to remove
    unused provisions allowing for the repricing of outstanding stock options.
 
(3) The exercise price is the closing price per share of the Company's common
    stock on the date of grant, as reported on The New York Stock Exchange, Inc.
    Composite Transactions Reporting System.
 
(4) The grant date present value is based on the Black-Scholes option pricing
    model adapted for use in valuing executive stock options, using the
    following assumptions for the grants made April 29, 1998 and September 17,
    1998, respectively: volatility -- 30.56 and 32.65 percent; risk free rate of
    return -- 5.79 and 4.76 percent; dividend yield -- 0.80 and 1.04 percent;
    and expected option life -- five years. There were no adjustments made to
    the model for non-transferability or risk of forfeiture. The actual value,
    if any, an executive may realize will depend on the excess of the market
    price over the exercise price on the date the option is exercised. There is
    no assurance the value realized by an executive will be at or near the value
    estimated by the Black-Scholes model.
 
                                       14
<PAGE>   19
 
                 OPTION/SAR EXERCISES AND YEAR-END VALUE TABLE
 
The table below provides supplemental information relating to the value realized
upon the exercise of stock options during the last fiscal year by the executive
officers named in the Summary Compensation Table above and the number and
intrinsic value of stock options held at year end. Year-end values are based
arbitrarily on the closing price of the Company's common stock for December 31,
1998, do not reflect the actual amounts, if any, which may be realized upon the
future exercise of remaining stock options, and should not be considered
indicative of future stock performance.
 
              AGGREGATED OPTION/SAR EXERCISES IN LAST FISCAL YEAR
                     AND FISCAL YEAR-END OPTION/SAR VALUES
<TABLE>
<CAPTION>
- - -----------------------------------------------------------------------------------------------
 
                                                            NUMBER OF SECURITIES UNDERLYING
                           SHARES                             UNEXERCISED OPTIONS/SARS AT
                        ACQUIRED ON         VALUE                    FY-END(#)(3)
                          EXERCISE         REALIZED     ---------------------------------------
NAME                       (#)(1)           ($)(2)          EXERCISABLE        UNEXERCISABLE
- - -----------------------------------------------------------------------------------------------
<S>                   <C>              <C>              <C>                 <C>
 Raymond Plank               0                0               133,625              93,775
- - -----------------------------------------------------------------------------------------------
 G. Steven Farris            0                0               108,350              66,750
- - -----------------------------------------------------------------------------------------------
 Roger B. Plank              0                0                77,775              60,625
- - -----------------------------------------------------------------------------------------------
 H. Craig Clark              0                0                38,100              34,450
- - -----------------------------------------------------------------------------------------------
 Lisa A. Floyd               0                0                32,825              48,575
- - -----------------------------------------------------------------------------------------------
 
<CAPTION>
- - ---------------------  ---------------------------------------
                                VALUE OF UNEXERCISED
                              IN-THE-MONEY OPTIONS/SARS
                                 AT FY-END($)(3)(4)
                       ---------------------------------------
 
NAME                       EXERCISABLE        UNEXERCISABLE
- - ---------------------  ---------------------------------------
<S>                    <C>                 <C>
 Raymond Plank                     0                  0
- - --------------------------------------------------------------
 G. Steven Farris                  0                  0
- - --------------------------------------------------------------
 Roger B. Plank              330,344                  0
- - --------------------------------------------------------------
 H. Craig Clark               49,141                  0
- - --------------------------------------------------------------
 Lisa A. Floyd                 5,438              1,812
- - --------------------------------------------------------------
</TABLE>
 
(1)  Number of shares with respect to which stock options were exercised during
     1998.
 
(2)  Fair market value on date of exercise minus the exercise price of stock
     options.
 
(3)  There were no SARs settled or outstanding at any time during the last
     fiscal year for any of the named executive officers.
 
(4)  Based on the closing price of $25.3125 per share of the Company's common
     stock as reported on The New York Stock Exchange, Inc. Composite
     Transactions Reporting System for December 31, 1998.
 
                                       15
<PAGE>   20
 
             THE MANAGEMENT DEVELOPMENT AND COMPENSATION COMMITTEE
                        REPORT ON EXECUTIVE COMPENSATION
 
This report is issued by the management development and compensation committee
of the board of directors to set out the executive compensation policies and
programs of the Company.
 
The objective of the Company's executive compensation program is to attract and
retain executives capable of leading the Company in a complex, competitive and
changing industry. A capable, highly-motivated senior management is an integral
part of the Company's continued success. The Company's financial performance is
in large part due to the talent and efforts of the Company's executive officers.
The program ties a significant portion of executive compensation to the
Company's success and is primarily comprised of a base salary, an incentive
bonus, and a long-term incentive component.
 
BASE SALARY
 
The committee believes that the most effective way to compete in the executive
labor market is to offer executives a competitive base salary. To achieve this
balance, the committee analyzes each executive's compensation using a four-step
process. First, the key executive positions within the Company are defined
carefully in terms of scope and responsibility, job complexity, knowledge and
experience required, and other relevant factors. Second, the positions are
ranked internally on the basis of these definitions to establish a logical
relationship among them. Third, the committee identifies the Company's direct
competitors which it believes share comparable operations, employee composition,
and capitalization, and obtains comparative compensation data about the
identified companies from independent, national executive compensation
consultants with expertise in salary and incentive plan structure. Finally,
easily-compared positions are priced in terms of salary ranges by reviewing the
comparative industry data and other surveys to establish relative salary ranges
for all key executive positions in the Company. Base salaries are targeted to
fall at or above the median of executive salaries paid by comparable companies,
and for 1998 they generally correspond to that practice. The committee sets each
executive's salary taking into account the individual's contribution to the
Company's success, how well the individual's responsibilities are fulfilled, the
individual's specific performance, growth in qualifications for the individual's
job, and other relevant aspects of performance.
 
Base salaries of all executives are generally reviewed every 12 to 24 months.
Salary adjustments are made within updated, market-confirmed salary ranges
according to the committee's assessment of the executive's individual
performance and the performance of the Company as a whole. However, changes in
the circumstances of a particular executive can prompt an interim compensation
adjustment. In 1998, the committee retained the services of an outside
compensation consultant, who was proposed by management and approved by the
committee, to review the base salaries of the Company's executives and confirm
that the salaries are competitive with those of comparable companies. That
review included comparative data from part but not all of the companies
comprising the Secondary Oils Index reflected in the stock performance chart set
forth below, as some of those companies have integrated operations or operate in
diversified industries.
 
Based on the factors discussed above and taking into consideration the outside
consultant's July 1998 report on their review, plus additional compensation data
available to the Company from other sources, ten of the Company's officers
received increases in compensation during 1998 to reflect market changes and
increased responsibilities. Each of the executives named in the
 
                                       16
<PAGE>   21
 
Summary Compensation Table, except Mr. Raymond Plank and Mr. Clark, received an
increase in base salary during 1998.
 
INCENTIVE BONUS
 
Executives, other than the Company's chief executive officer ("CEO") and the
Company's president (separate plan described below), are eligible to receive an
incentive bonus tied directly to the Company's achievement of specified
strategic objectives and the executive's achievement of personal objectives. In
the early months of the year, the committee establishes a listing of strategic
corporate objectives based on those submitted by senior management and the
executive officers submit personal goals relating to cost reduction, operational
improvements, program or project enhancements, or other objectively determinable
goals. Personal goals must be approved by the executive's superior and the
corporate strategic objectives are approved by both the committee and the full
board of directors. In 1998, 75 percent of each executive's bonus depended upon
the Company's achievement of the specified strategic corporate objectives, with
intermediate factors ranging from zero if none of the objectives were met, to
100 percent if the maximum number of objectives were achieved. The remaining 25
percent of each executive's bonus depended upon the percentage of the
executive's personal goals which were successfully accomplished, as well as the
Company's achievement of the specified strategic corporate objectives. This
incentive compensation plan effectively correlates a large portion of executive
compensation to predetermined strategic corporate objectives and other
objectively determinable goals, all designed to translate into value for the
Company's stockholders. Committee policy provides for bonuses targeted at 50
percent of each executive's base salary, subject to corporate performance.
 
Executive bonuses paid in 1999 were based on management's achievement during
1998 of specific strategic corporate objectives (a) established by the committee
to enhance the Company's financial position, create greater interaction and
involvement by management, and encourage and develop a longer-term strategic
perspective, and (b) which were outside of the historical measurements of
earnings, cash flow, production and reserves. The Company has elected not to
detail the individual items within the specified strategic corporate objectives
as disclosure of such information could provide a competitive advantage to one
or more of the Company's peers; however, the objectives were annualized for
incentive purposes and were broad enough to have potential impact beyond 1998.
Each item in the listing of strategic corporate objectives, as adjusted during
the year in response to changing business conditions, (i) was weighted to
designate its overall importance and impact and assigned a corresponding
percentage of the total weighting, based on a maximum percentage total of 100
percent, and (ii) was written so as to have a defined, measurable outcome, a
time frame for achievement, and assigned responsibility. The committee approved
incentive payments for attainment in 1998 based on a factor of 44.65 percent.
This achievement level includes a 50-percent reduction in earned bonuses for
eligible executives, reflecting the depressed state of the oil and gas industry,
but recognizing many significant accomplishments which left the Company with a
strong balance sheet at year-end 1998.
 
The CEO and the president are each eligible to receive an incentive bonus under
a separate incentive compensation plan, which functions and is administered in
the same way as the plan described above except that the corporate performance
goals are tied directly to the Company's annual financial and operational
results as compared to the results of a group of its peer companies. The goals
include earnings, production, finding costs, reserves and ratio of debt to
capitalization. The CEO and the president requested the committee not to award
them any bonuses under this plan. However, the committee determined to pay the
CEO and the president
 
                                       17
<PAGE>   22
 
nominal bonuses of approximately 17 percent and 22 percent, respectively, of
earned potential in recognition of their leadership during difficult industry
times.
 
In addition to the Company's incentive compensation plans, the committee may
elect to award a special achievement bonus to an executive officer who has
rendered services during the year that substantially exceed those normally
required. Special achievement bonuses (a) reflect the committee's decision to
reward any executive whose extraordinary effort has substantially benefited the
Company and its stockholders during the year, (b) are awarded only in
exceptional circumstances, and (c) are in amounts relative to the benefit
provided to the Company. Special achievement bonuses were paid to three of the
executive officers named in the Summary Compensation Table in recognition of
their leadership during 1998 in the following areas: Mr. Roger Plank in
connection with the Company's key financing arrangements, Mr. Clark in
connection with the sale of ProEnergy, and Ms. Floyd in connection with
strategic property sales and trades.
 
LONG-TERM INCENTIVES
 
Long-term incentives in forms relating to the Company's common stock serve to
align the interests of executive officers with the Company's stockholders by
tying a significant portion of each executive's total long-term compensation to
the continued growth of the Company and appreciation of its common stock. In
1998, the Company's executive officers received stock option grants under the
Company's 1995 and 1998 Stock Option Plans, both of which were amended in
December 1998 to remove unused provisions allowing for the repricing of
outstanding stock options. The grants of stock options made in 1998 to the
Company's officers named in the Summary Compensation Table presented above are
reflected in the Option/SAR Grants Table. In May 1997, the Company's
stockholders approved the 1996 Share Price Appreciation Plan (the "Appreciation
Plan"), under which conditional grants were made to the Company's executive
officers in October 1996.
 
Stock options and conditional grants awarded to executives are proportionate to
each officer's base salary and benefit them only if stockholders also benefit
from appreciating stock prices. Individual stock option grants are targeted at
the 50th percentile of similar plans maintained by comparable companies, taking
into account options previously granted, vest over four years, and have an
exercise price equal to the per share closing price of the Company's common
stock on the date of grant. The conditional grants under the Appreciation Plan
are intended to provide specific individual incentives to focus on achieving
significant share price appreciation for the balance of the decade. Benefits are
payable under the conditional grants only if the Company's common stock attains
price goals based on $50 and $60 per share, respectively, prior to January 1,
2000.
 
In recognition of his past contributions and expected future contributions to
the Company, G. Steven Farris, the Company's president and chief operating
officer, was granted a conditional stock award for a total of 100,000 shares of
the Company's common stock in December 1998. The award is composed of five
periodic installments, commencing on January 1st of each of the next five years
(1999-2003). Each installment vests on the fifth anniversary following the
applicable commencement date (subject to acceleration under specific
circumstances), and is payable 40 percent in cash and 60 percent in the form of
stock. To receive each installment, Mr. Farris must be employed by the Company
on the applicable commencement and vesting dates. In the event Mr. Farris elects
to terminate his employment with the Company or his employment is terminated for
cause, any unvested installments will be forfeited.
 
                                       18
<PAGE>   23
 
CHIEF EXECUTIVE OFFICER
 
Raymond Plank, the Company's CEO, directs Apache's intensive, on-going programs
to monitor, analyze and respond creatively to the changes and new requirements
in the oil and gas industry. His activities include leadership in implementing
the Company's capital expenditure programs, and maintenance of sound business
relationships with the management of many of the nation's large oil and gas
companies. These relationships are important to Apache's strategic alliances and
to its acquisition approach, which emphasizes privately negotiated transactions
that develop and achieve mutual business benefits. Mr. Plank has also been
responsible for the Company's developing interest and successful exploration
efforts going forward in international areas such as Egypt, Australia, Poland
and China. As an active chief executive, he oversees all of the Company's major
business units and guides and develops Apache's senior management. Reporting
directly to Mr. Plank are the president and chief operating officer, the vice
president and chief financial officer, and the vice president and general
counsel.
 
Mr. Plank's base salary, incentive bonus and long-term incentives are determined
in the same manner as is the compensation for the Company's other executive
officers and are reflected in the Summary Compensation Table above. His last
base salary adjustment was effective January 1, 1996, and his bonus paid in 1999
was based on the Company's 1998 performance, as discussed above. Mr. Plank, as
the Company's most senior executive officer, prepares his personal goals in
consultation with the committee and periodically reports to the committee on his
progress toward achievement of those goals. Mr. Plank's employment agreement
prohibits the reduction of his salary below a specified amount. See "Employment
Contracts and Termination of Employment and Change-in-Control Arrangements."
 
Mr. Plank's 1998 base salary was within the committee's percentile targets and
took into account the following: Mr. Plank's active role in the Company's
management and leadership of successful acquisitions; the Company's financial
performance during 1997; the challenges and expectations for the Company in
1998; Mr. Plank's recognized stature as a spokesman for the oil and gas
industry; and his role as a Company founder and his 44 years of service as the
Company's senior executive officer. Mr. Plank's bonus paid in 1999 represented
approximately 17 percent of his eligible bonus amount under the incentive
compensation plan, reflecting the committee's election to award him a nominal
amount as discussed above.
 
OMNIBUS BUDGET RECONCILIATION ACT OF 1993
 
The Omnibus Budget Reconciliation Act of 1993 ("OBRA") imposes a limit, with
certain exceptions, on the amount that a publicly held corporation may deduct in
any tax year commencing on or after January 1, 1994, for the compensation paid
or accrued with respect to its chief executive officer and its four most highly
compensated executive officers (other than the chief executive officer). In
December 1995, the Internal Revenue Service issued final regulations
implementing the legislation, with the regulations effective as of January 1,
1994. Certain performance-based compensation is specifically exempt from the
limit if it meets the requirements contained in these final regulations. The
committee continues to review the Company's compensation plans based upon these
regulations and, from time to time, determines what further actions or changes
to the Company's compensation plans, if any, are appropriate. The Company
anticipates no loss of deductibility attributable to compensation paid or
accrued in 1998.
 
Grants of stock options made under the Company's 1990 Stock Incentive Plan, 1995
Stock Option Plan and 1998 Stock Option Plan qualify as "performance-based"
under the regulations.
 
                                       19
<PAGE>   24
 
Conditional awards made under the Appreciation Plan also qualify as
performance-based. The Company's existing incentive compensation plans and
special achievement bonuses do not currently meet the requirements of the
regulations, although they are designed to reward the contribution and
performance of employees and to provide a meaningful incentive for achieving the
Company's goals, which in turn enhances stockholder value. While the committee
cannot predict with certainty how the Company's compensation policies may be
further impacted by OBRA, it is anticipated that executive compensation paid or
accrued pursuant to any of the Company's compensation plans that do not meet the
requirements of the regulations will not result in any significant loss of tax
deductions in the foreseeable future.
 
SUMMARY
 
According to information provided to the committee in July 1998 by its
independent compensation consultant, the amount of the Company's cash
compensation paid to all of its executive officers during 1998 was competitive
and slightly above the median for comparable companies. As shown on the
Performance Graph following this report, the cumulative total return on the
Company's common stock has substantially equaled that of the Dow Jones Secondary
Oil Index over the last five years. In view of the Company's competitive
performance, the committee believes that its current executive compensation
policy is successful in providing stockholders with talented, dedicated
executives at competitive compensation levels.
 
March 22, 1999                          Management Development and Compensation
                                        Committee
 
                                        Frederick M. Bohen
                                        A. D. Frazier, Jr.
                                        John A. Kocur
                                        George D. Lawrence Jr.
                                        Joseph A. Rice
 
                                       20
<PAGE>   25
 
                               PERFORMANCE GRAPH
 
The following stock price performance graph is included in accordance with the
SEC's executive compensation disclosure rules and is intended to allow
stockholders to review the Company's executive compensation policies in light of
corresponding stockholder returns, expressed in terms of the appreciation of the
Company's common stock relative to two broad-based stock performance indices.
The information is included for historical comparative purposes only and should
not be considered indicative of future stock performance. The graph compares the
yearly percentage change in the cumulative total stockholder return on the
Company's common stock with the cumulative total return of the Standard & Poor's
Composite 500 Stock Index and of the Dow Jones Secondary Oils Stock Index from
December 31, 1993 through December 31, 1998.
 
                COMPARISON OF FIVE YEAR CUMULATIVE TOTAL RETURN
                      FOR THE YEAR ENDED DECEMBER 31, 1998
 
<TABLE>
<CAPTION>
                                                                         S&P'S               DJ
                                                                       COMPOSITE         SECONDARY
               MEASUREMENT PERIOD                      APACHE          500 STOCK         OILS STOCK
             (FISCAL YEAR COVERED)                  CORPORATION          INDEX             INDEX
           <S>                                         <C>             <C>               <C>
           1993                                        100               100                 100
           1994                                        107               101                  97
           1995                                        126               139                 112
           1996                                        150               171                 138
           1997                                        150               229                 147
           1998                                        108               294                 107
</TABLE>
 
                                       21
<PAGE>   26
 
                    EMPLOYMENT CONTRACTS AND TERMINATION OF
                 EMPLOYMENT AND CHANGE-IN-CONTROL ARRANGEMENTS
 
Mr. Raymond Plank serves the Company under an employment agreement entered into
in December 1975, amended and restated in December 1990 and amended in April
1996. The agreement has an undefined term and is terminable at will by the
Company's board of directors. Mr. Plank's annual compensation under the
agreement is determined by the board of directors, but may not be less than
$450,000. If his service as director and chief executive officer is terminated
by the board of directors, Mr. Plank will serve as advisor and consultant to the
Company for the remainder of his life at annual compensation equal to 50 percent
of his then-current annual compensation and will receive health, dental and
vision benefits for himself, his spouse and his eligible dependents during the
remainder of his life. Pursuant to the agreement and in exchange for
surrendering life insurance coverage, an annuity was purchased for Mr. Plank
that pays $31,500 annually until 2008. Mr. Plank has agreed not to render
service to any of the Company's competitors for the entire period covered by the
agreement. Upon Mr. Plank's death, a total of $750,000 shall be paid (a) to his
designee in equal monthly installments over ten years, or (b) if he has made no
designation, in a lump sum to his estate.
 
Mr. Farris serves the Company pursuant to an employment agreement, dated June 6,
1988, under which he receives a current annual salary of $550,000. The agreement
has an undefined term and may be terminated by either the Company or Mr. Farris
on 30 days advance written notice. If Mr. Farris' employment is terminated
without cause, or if he terminates his employment within 30 days of a reduction
in his salary without a proportionate reduction in the salaries of all other
Company executives, Mr. Farris will receive, for 36 months thereafter, (a) an
amount equal to his base salary as it existed 60 days prior to termination and
(b) 50 percent of the maximum amount for which he qualified under the Company's
incentive compensation plan, calculated on his base compensation as it existed
60 days prior to termination. In the event of Mr. Farris' death during the
36-month period, the amounts described above shall be paid to his heirs or
estate. Mr. Farris has agreed not to render service to any of the Company's
competitors for the term of his employment or, unless he is terminated without
cause, for 36 months thereafter.
 
On December 17, 1998, Mr. Farris was granted a conditional stock award, the
basic provisions of which are discussed above in the footnotes to the Summary
Compensation Table and under the caption "Long-Term Incentives" in the report on
executive compensation. Under the terms of the agreement for this award, the
vesting of one or more of the five periodic installments is subject to
acceleration under specific circumstances. Those circumstances generally relate
to (a) termination of Mr. Farris' employment other than for cause, (b) his death
or total disability, (c) an individual other than Mr. Raymond Plank or Mr.
Farris becoming the Company's chief executive officer, and (d) merger,
acquisition or other "change-in-control" of the Company.
 
In addition to the foregoing, the Company has established an income continuance
plan. The plan provides that all officers of the Company, including the officers
named in the Summary Compensation Table, and all employees who have either
reached the age of 40, served the Company for more than ten years, or have been
designated for participation based upon special skills or experience, will
receive monthly payments approximating their monthly income and continued
medical and health benefits from the Company for up to two years, if their
employment is terminated as a result of a "change in control" of the Company, as
defined in the plan.
 
                                       22
<PAGE>   27
 
                       COMPENSATION COMMITTEE INTERLOCKS
                           AND INSIDER PARTICIPATION
 
Frederick M. Bohen, John A. Kocur, A. D. Frazier, Jr., George D. Lawrence Jr.
and Joseph A. Rice served on the management development and compensation
committee of the Company's board of directors for all of 1998.
 
Mr. Kocur, a member of the committee since September 1991 and a director of the
Company since 1977, retired as an executive officer in June 1991. Pursuant to
the terms of an employment agreement in place at the time of his retirement, Mr.
Kocur and his spouse receive health, dental and vision benefits throughout his
life.
 
Mr. Lawrence, a member of the committee since May 1997 and a director of the
Company since May 1996, is the former president and chief executive officer of
The Phoenix Resource Companies, Inc. ("Phoenix"). See "Certain Business
Relationships and Transactions." Pursuant to the terms of his employment
agreement with Phoenix, Mr. Lawrence received medical and dental benefits
through December 1997. Since that time, he has purchased medical and dental
coverage through the Company.
 
                CERTAIN BUSINESS RELATIONSHIPS AND TRANSACTIONS
 
George D. Lawrence Jr., a member of the Company's board of directors and the
former president and chief executive officer of Phoenix, joined Apache's board
in conjunction with the Company's acquisition of Phoenix by a merger (the
"Merger") on May 20, 1996, through which Phoenix became a wholly-owned
subsidiary of Apache. Merger consideration totaled $396.3 million, consisting of
approximately 12,190,000 shares of Apache's common stock valued at $26.00 per
share, $14.9 million of net value associated with Phoenix stock options assumed
by Apache, and $64.5 million in cash.
 
Upon consummation of the Merger, Apache assumed Phoenix stock options that
remained outstanding on May 20, 1996, including those granted to Mr. Lawrence
pursuant to Phoenix's 1990 Employee Stock Option Plan. As of February 28, 1999,
there are options outstanding and exercisable by Mr. Lawrence covering a total
of 185,625 shares of Apache common stock at exercise prices ranging from $3.46
to $24.83 per share.
 
In the ordinary course of business, Apache paid to Maralo, LLC ("Maralo") during
1998 approximately $240,000 for Apache's proportionate share of drilling and
workover costs and routine expenses relating to nine oil and gas wells in which
Apache owns interests and for which Maralo is operator, and the Company received
approximately $523,000 in 1998 for its proportionate share of revenues from
those wells, of which approximately $208,000 was paid directly to Apache by
Maralo or related entities. During 1998, Apache paid approximately $4,000 to
Maralo relating to four oil and gas wells in which Maralo owns royalty interests
and of which the Company is operator. Mary Ralph Lowe, a member of the Company's
board of directors, is president, chief executive officer and the sole
stockholder of Maralo.
 
In the ordinary course of business, Key Production Company, Inc. ("Key") paid to
Apache during 1998 approximately $7.7 million for Key's proportionate share of
drilling and workover costs, mineral interests, and routine expenses relating to
369 oil and gas wells in which Key owns interests and of which Apache is the
operator. Key received approximately $5.7 million in 1998 for its proportionate
share of revenues from those interests, of which approximately $3.4 million
 
                                       23
<PAGE>   28
 
was paid directly to Key by Apache or related entities. F.H. Merelli, a member
of the Company's board of directors, is chairman of the board, president and
chief executive officer of Key.
 
As noted above under "Executive Officers of the Company," Mr. Clark was on
assignment from October 1997 through June 1998, serving as chairman and chief
executive officer of ProEnergy. In June 1998, the Company formed a strategic
alliance with Cinergy to market substantially all of the Company's natural gas
production from North America and sold its 57-percent interest in ProEnergy to
Cinergy. ProEnergy will continue to market the Company's North American gas
production for ten years, with an option to terminate after six years, under an
amended and restated gas purchase agreement effective July 1, 1998.
 
                         INDEPENDENT PUBLIC ACCOUNTANTS
 
Arthur Andersen LLP was the Company's independent public accounting firm for the
fiscal year 1998 and has been selected to continue in that capacity for 1999.
Representatives of Arthur Andersen LLP will be present at the annual meeting and
will have an opportunity to make a statement if they desire to do so and to
respond to appropriate questions.
 
                             STOCKHOLDER PROPOSALS
 
Stockholders are entitled to submit proposals on matters appropriate for
stockholder action consistent with regulations of the SEC and the Company's
bylaws. Should a stockholder wish to have a proposal appear in the Company's
proxy statement for next year's annual meeting, under the regulations of the
SEC, it must be received by the Company's corporate secretary (at 2000 Post Oak
Boulevard, Suite 100, Houston, Texas 77056-4400) on or before November 30, 1999.
 
                            SOLICITATION OF PROXIES
 
Solicitation of proxies for use at the annual meeting may be made in person or
by mail, telephone or telegram, by directors, officers and regular employees of
the Company. These persons will receive no special compensation for any
solicitation activities. The Company has requested banking institutions,
brokerage firms, custodians, trustees, nominees and fiduciaries to forward
solicitation materials to the beneficial owners of shares of the Company's
common stock for whom they are record holder, and the Company will, upon
request, reimburse reasonable forwarding expenses. The Company has retained
Georgeson & Company Inc. to assist in soliciting proxies from brokers, bank
nominees and other institutional holders for a fee not to exceed $7,500, plus
expenses. All costs of the solicitation will be borne by the Company.
 
                                         By order of the Board of Directors

                                         APACHE CORPORATION

                                         /s/ C. L. PEPER
                                         -------------------
                                             C. L. PEPER
                                         Corporate Secretary
 
NOTE: STOCKHOLDERS ARE REQUESTED TO PROMPTLY VOTE THEIR SHARES USING ONE OF THE
      METHODS EXPLAINED ON PAGE 1 OF THIS PROXY STATEMENT.
 
                                       24
<PAGE>   29
 
- - --------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------
 
                            NOTICE OF ANNUAL MEETING
 
                                OF STOCKHOLDERS
 
                                  MAY 6, 1999
 
                              AND PROXY STATEMENT
 
                                 [APACHE LOGO]
 
                              ONE POST OAK CENTRAL
 
                       2000 POST OAK BOULEVARD, SUITE 100
 
                           HOUSTON, TEXAS 77056-4400
 
                                                (LOGO)Printed on recycled paper.
- - --------------------------------------------------------------------------------
- - --------------------------------------------------------------------------------
<PAGE>   30
<TABLE>
<S>                                                                                        <C>
                                                                                           ------------------------
                                                                                              COMPANY #
                                                                                              CONTROL #
                                                                                           ------------------------     
THERE ARE THREE WAYS TO VOTE YOUR PROXY



YOUR TELEPHONE OR INTERNET VOTE AUTHORIZES THE NAMED PROXIES TO VOTE YOUR SHARES IN THE SAME MANNER AS IF YOU MARKED,
SIGNED AND RETURNED YOUR PROXY CARD.

VOTE BY TELEPHONE - TOLL FREE - 1-800-240-6326 - QUICK *** EASY *** IMMEDIATE

o       Use any touch-tone telephone to vote your proxy 24 hours a day, 7 days a week.

o       You will be prompted to enter your 3-digit Company Number and your 7-digit Control Number which are located above.

o       Follow the simple instructions provided.

VOTE BY INTERNET - http://www.eproxy.com/apa/ - QUICK *** EASY *** IMMEDIATE

o       Use the Internet to vote your proxy 24 hours a day, 7 days a week.
o       You will be prompted to enter your 3-digit Company Number and your 7-digit Control Number which are located above to
        obtain your records and create an electronic ballot.

VOTE BY MAIL

Mark, sign and date your proxy card and return it in the postage-paid envelope provided or return it to Apache
Corporation, c/o Shareowner ServicesSM, P.O. Box 64873, St. Paul, MN 55164-0873.




                         IF YOU VOTE BY TELEPHONE OR INTERNET, PLEASE DO NOT MAIL YOUR PROXY CARD
                                                    Please detach here


                                       THE DIRECTORS RECOMMEND A VOTE "FOR" ITEM 1.

1.  Election of directors -- director nominees:
         01  G. Steven Farris              03  A. D. Frazier, Jr.       [ ] Vote FOR          [ ] Vote WITHHELD
         02  Randolph M. Ferlic            04  John A. Kocur                all nominees          from all nominees

                                                                                -------------------------------------------
(Instructions: To  withhold  authority  to vote  for  any  individual nominee, 
write the number(s) of the nominee(s) in the box to the right.)
                                                                                -------------------------------------------

2.  The Proxies are authorized to vote in their best judgment upon such other business as may properly come before the
meeting.

PLEASE MARK, SIGN, DATE AND PROMPTLY RETURN THIS PROXY CARD USING THE ENCLOSED ENVELOPE.

Address Change?  Mark Box       [ ]                                                  Date                              
                                                                                           ----------------------------
Indicate change below:
                                                                         ------------------------------------------------------

                                                                         ------------------------------------------------------
                                                                         Signature(s) In Box
                                                                         Please sign exactly as your name(s) appear on
                                                                         Proxy.  If held in joint tenancy, all persons
                                                                         must sign. Trustees, administrators, etc.
                                                                         should include title and authority.
                                                                         Corporations should provide full name of
                                                                         corporation and title of authorized officer
                                                                         signing the proxy.
</TABLE>

<PAGE>   31

                                                                               
                                                                               
                                                                               
                                                                               
                                                                               
                               APACHE CORPORATION                              
                                                                               
                         ANNUAL MEETING OF STOCKHOLDERS                        
                                                                               
                             THURSDAY, MAY 6, 1999                             
                                   10:00 A.M.                                  
                                                                               
                          DOUBLETREE HOTEL AT POST OAK                         
                            2001 POST OAK BOULEVARD                            
                                 HOUSTON, TEXAS                                
                                                                               
                                                                               
                                                                               
                                                                               
                                                                               
                                                                               
                                                                               
                                                                               
- - --------------------------------------------------------------------------------
                                                                               
                                                                               
                        APACHE CORPORATION - 1999 PROXY                        
                                                                               
          THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS.         
                                                                               
The undersigned appoints Eugene C. Fiedorek, F. H. Merelli and George D.       
Lawrence Jr. as Proxies, with the power of substitution, and authorizes them to
represent the undersigned at the annual meeting of stockholders to be held May 
6, 1999, or any adjournment thereof, and to vote all the shares of common stock
of Apache Corporation held of record by the undersigned on March 17, 1999, as  
designated on the reverse side.                                                
                                                                               
This Proxy, when properly executed, will be voted in the manner directed by the
undersigned stockholder.  IF NO DIRECTION IS GIVEN, THIS PROXY WILL BE VOTED   
"FOR" THE ELECTION OF DIRECTORS.                                               
                                                                               
                                                                               
                                                                               
                                                                               
                                                                               
                  See reverse side for voting instructions.                    


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