SANTA FE ENERGY RESOURCES INC
S-4, 1999-02-02
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>
 
   As filed with the Securities and Exchange Commission on February 2, 1999.
 
                                                 Registration No. 333-
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
 
                                ---------------
 
                                    FORM S-4
 
                             REGISTRATION STATEMENT
                                     Under
                           THE SECURITIES ACT OF 1933
 
                                ---------------
 
                        SANTA FE ENERGY RESOURCES, INC.
             (Exact name of registrant as specified in its charter)
 
<TABLE>
<CAPTION>
                Delaware                                     36-2722169
<S>                                                     <C>
  (State or other jurisdiction                            (I.R.S. Employer
of incorporation or organization)                       Identification Number)
</TABLE>
 
                              1616 South Voss Road
                              Houston, Texas 77057
                                 (713) 507-5000
              (Address, including zip code, and telephone number,
       including area code, of registrant's principal executive offices)
 
                                ---------------
 
                                 David L. Hicks
                    Vice President--Law and General Counsel
                        Santa Fe Energy Resources, Inc.
                              1616 South Voss Road
                              Houston, Texas 77057
                                 (713) 507-5000
               (Name, address, including zip code, and telephone
               number, including area code, of agent for service)
 
                                ---------------
 
                                   copies to:
 
<TABLE>
<CAPTION>

<S>                                                  <C> 
           G. Michael O'Leary                           Jeffrey E. Eldredge
         Andrews & Kurth L.L.P.                       Vinson & Elkins L.L.P.
         600 Travis, Suite 4200                      3700 Trammell Crow Center
          Houston, Texas 77002                           2001 Ross Avenue
             (713) 220-4200                             Dallas, Texas 75201
                                                          (214) 220-7700
</TABLE>
 
   Approximate date of commencement of proposed sale to the public: As soon as
practicable after the registration statement becomes effective and the
satisfaction or waiver of all other conditions to the merger, pursuant to the
Agreement and Plan of Merger, dated as of January 13, 1999, described in the
enclosed Joint Proxy Statement/Prospectus.
 
                                ---------------
 
   If the securities being registered on this Form are being offered in
connection with the formation of a holding company and there is compliance with
General Instruction G, check the following box. [_]
   If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering. [_]
   If this Form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]
 
                        Calculation of Registration Fee
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                        Proposed maximum Proposed maximum
Title of each class of                      offering        aggregate
securities to be          Amount to be   price per unit   offering price     Amount of
registered               registered (2)        (3)              (3)       registration fee
- ------------------------------------------------------------------------------------------
<S>                      <C>            <C>              <C>              <C>
Common stock, $0.01 par
 value (1)..............  73,695,219        $5.32012       $392,067,409       $108,995
- ------------------------------------------------------------------------------------------
</TABLE>
- --------------------------------------------------------------------------------
(1) Includes associated rights to purchase shares of the registrant's Series A
    Junior Participating Preferred Stock. The rights are not currently
    separable from the shares of common stock, par value $0.01 per share, of
    registrant and are not currently exercisable.
(2) Consists of up to 73,695,219 shares of common stock, par value $0.01 per
    share, of registrant issuable upon the conversion, pursuant to the merger
    described herein, of (i) 33,364,567 shares of common stock, par value $0.01
    per share of Snyder Oil Corporation outstanding on January 27, 1999 and
    (ii) up to 2,584,320 shares of Snyder common stock which may be issued
    pursuant to outstanding options between January 27, 1999 and consummation
    of the merger.
(3) Estimated solely for the purpose of calculating the registration fee
    pursuant to Rule 457(f)(1) and Rule 457(c), based on the product of
    $10.90625 (the average of the high and low prices of Snyder common stock on
    January 28, 1999 on the New York Stock Exchange Composite Transaction Tape)
    times 35,948,887 (the number of shares of Snyder common stock outstanding
    and reserved for issuance upon the exercise of outstanding options to
    purchase Snyder common stock on January 27, 1999).
 
                                ---------------
 
   The registrant hereby amends this registration statement on such date or
dates as may be necessary to delay its effective date until the registrant
shall file a further amendment which specifically states that this registration
statement shall thereafter become effective in accordance with Section 8(a) of
the Securities Act of 1933 or until the registration statement shall become
effective on such date as the Securities and Exchange Commission, acting
pursuant to said Section 8(a), may determine.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
 
                             SNYDER OIL CORPORATION
                          777 Main Street, Suite 1400
                            Fort Worth, Texas 76102
 
                   NOTICE OF SPECIAL MEETING OF STOCKHOLDERS
                            TO BE HELD ON    , 1999
 
To the Stockholders of Snyder Oil Corporation:
 
   A special meeting of the holders of common stock of Snyder Oil Corporation,
a Delaware corporation ("Snyder"), will be held at [TIME] local time, on [DAY],
[DATE], 1999 at [LOCATION], [ADDRESS]. At the Snyder special meeting, the
holders of common stock of Snyder will:
 
  1. Consider and vote upon a proposal to approve and adopt the Agreement and
     Plan of Merger, dated as of January 13, 1999, between Snyder and Santa
     Fe Energy Resources, Inc., a Delaware corporation ("Santa Fe"), relating
     to the merger of Snyder with and into Santa Fe, with Santa Fe surviving
     the merger. In the merger, each outstanding share of Snyder common stock
     will be converted to 2.05 shares of common stock of Santa Fe, and a
     corresponding number of preferred stock purchase rights under the Santa
     Fe Preferred Stock Purchase Rights Plan. A description of the merger and
     the merger agreement is contained in the accompanying Joint Proxy
     Statement/Prospectus, which includes a copy of the merger agreement; and
 
  2. Transact such other business as may properly come before the special
     meeting or any adjournments or postponements thereof.
 
   The board of directors has fixed the close of business on     , 1999 as the
record date for determining which stockholders are entitled to notice of, and
to vote at, the special meeting or any adjournments or postponements thereof.
Complete lists of such stockholders will be available for examination at the
offices of Snyder during normal business hours by any holder of Snyder common
stock, for any purpose relevant to the special meeting, for a period of ten
days prior to the special meeting.
 
   The board of directors of Snyder unanimously recommends that you vote for
the approval and adoption of the merger agreement, as they intend to do with
respect to each of their personal Snyder shareholdings. The affirmative vote of
the holders of the majority of the outstanding shares of Snyder common stock is
required to approve and adopt the merger agreement and the merger.
 
   If you do not send in your proxy or vote at the special meeting, it will
have the same effect as if you voted against the merger.
 
   Holders of Snyder common stock, even if they expect to be present at the
special meeting, are requested to sign, vote and date the enclosed proxy and
return it promptly in the enclosed envelope. Any stockholder giving a proxy has
the power to revoke it any time prior to the special meeting. Stockholders who
are present at the special meeting may withdraw their proxies and vote in
person.
 
                                          By Order of the Board of Directors,
 
     , 1999
 
                                          John H. Karnes
                                          Corporate Secretary
<PAGE>
 
                        SANTA FE ENERGY RESOURCES, INC.
                              1616 South Voss Road
                              Houston, Texas 77057
 
                   NOTICE OF SPECIAL MEETING OF STOCKHOLDERS
                            TO BE HELD ON     , 1999
 
To the Stockholders of Santa Fe Energy Resources, Inc.:
 
   A special meeting of the holders of common stock of Santa Fe Energy
Resources, Inc., a Delaware corporation ("Santa Fe"), will be held at [TIME]
local time, on [DAY], [DATE], 1999 at [LOCATION], [ADDRESS]. At the Santa Fe
special meeting, the holders of common stock of Santa Fe will:
 
  1. Consider and vote upon a proposal to approve and adopt the Agreement and
     Plan of Merger, dated as of January 13, 1999, between Snyder Oil
     Corporation, a Delaware corporation ("Snyder"), and Santa Fe, relating
     to the merger of Snyder into Santa Fe, with Santa Fe surviving the
     merger, and, in connection therewith, to approve the issuance of 2.05
     shares of common stock of Santa Fe and a corresponding number of
     preferred stock purchase rights under the Santa Fe Preferred Stock
     Purchase Rights Plan for each share of common stock of Snyder. Approval
     of the merger will also constitute approval of certain amendments to
     Santa Fe's certificate of incorporation to change Santa Fe's name to
     "Santa Fe Snyder Corporation" and increase the number of authorized
     shares of capital stock to 300,000,000. A description of the merger and
     the merger agreement is contained in the accompanying Joint Proxy
     Statement/Prospectus, which includes a copy of the merger agreement;
 
 
  2. Consider and vote upon a proposal to elect, subject to the consummation
     of the merger, five individuals designated by Snyder to serve on the
     board of directors of Santa Fe Snyder (resulting in an increase of the
     number of directors of Santa Fe to eleven) as follows:
 
    .   one person to serve as Class I director with a term expiring at
        Santa Fe's 1999 Annual Meeting of Stockholders;
 
    .   two persons to serve as Class II directors with a term expiring at
        Santa Fe's 2000 Annual Meeting of Stockholders;
 
    .   two persons to serve as Class III directors with a term expiring at
        Santa Fe's 2001 Annual Meeting of Stockholders; and
 
  3. Transact such other business as may properly come before the special
     meeting or any adjournments or postponements thereof.
 
   The board of directors has fixed the close of business on      , 1999 as the
record date for determining which stockholders are entitled to notice of, and
to vote at, the special meeting or any adjournments or postponements thereof.
Complete lists of such stockholders will be available for examination at the
offices of Santa Fe during normal business hours by any holder of Santa Fe's
common stock, for any purpose relevant to the special meeting, for a period of
ten days prior to the special meeting.
 
   The board of directors of Santa Fe unanimously recommends that you vote for
the approval and adoption of the merger agreement, including the issuance of
shares of Santa Fe common stock in connection therewith, and for each of the
nominees for director identified above. The affirmative vote of the holders of
the majority of the outstanding shares of Santa Fe common stock is required to
approve and adopt the merger agreement and the merger, and the affirmative vote
of a plurality of the votes cast where a quorum is present is required to
approve the election of a director. Each member of Santa Fe's board of
directors intends to vote his or her shares of Santa Fe common stock "for" all
of these proposals.
 
   If you do not send in your proxy or vote at the special meeting, it will
have the same effect as if you voted against the merger.
 
   Holders of Santa Fe common stock, even if they expect to be present at the
special meeting, are requested to sign, vote and date the enclosed proxy and
return it promptly in the enclosed envelope. Any stockholder giving a proxy has
the power to revoke it any time prior to the special meeting. Stockholders who
are present at the special meeting may withdraw their proxies and vote in
person.
 
                                        By Order of the Board of Directors,
 
    , 1999
                                        Mark A. Older
                                        Corporate Secretary
<PAGE>

*******************************************************************************
*  The information in this prospectus is not complete and may be changed.     *
*  We may not sell these securities until the registration statement filed    *
*  with the Securities and Exchange Commission is effective. This             *
*  prospectus is not an offer to sell these securities and it is not          *
*  soliciting an offer to buy these securities in any state where the offer   *
*  or sale is not permitted.                                                  *
*******************************************************************************


 
                 SUBJECT TO COMPLETION, DATED FEBRUARY 2, 1999
 
[SANTA FE ENERGY RESOURCES, INC. LOGO]           [SNYDER OIL CORPORATION LOGO]
 
                    PROPOSED MERGER--YOUR VOTE IS IMPORTANT
 
   The boards of directors of Santa Fe Energy Resources, Inc. and Snyder Oil
Corporation have agreed upon a merger of the two companies. The merger is
intended to create a larger, more diversified, financially stronger and more
cost efficient enterprise. If we complete the merger, Snyder will be merged
into Santa Fe and Snyder stockholders will receive 2.05 shares of Santa Fe
common stock for each share of Snyder common stock that they own. Santa Fe
stockholders will continue to own their existing shares of Santa Fe common
stock after the merger. In connection with the merger, Santa Fe will be renamed
"Santa Fe Snyder Corporation." The common stock to be issued to Snyder
stockholders in the merger will represent approximately 40 percent of the
outstanding common stock of Santa Fe Snyder after the merger and the current
Santa Fe stockholders will hold approximately 60 percent of the outstanding
common stock of Santa Fe Snyder after the merger. The Santa Fe common stock
trades on the New York Stock Exchange under the symbol "SFR." The trading
symbol will be changed concurrently with the merger to "SFS."
 
  We cannot complete the merger unless the Santa Fe stockholders and the Snyder
stockholders approve the merger. The Santa Fe stockholders are also asked to
approve the election of five individuals designated by Snyder as additional
members of the Santa Fe Snyder board of directors. We have scheduled special
meetings for the Santa Fe stockholders and the Snyder stockholders to vote on
these matters.
 
  Your Vote is Very Important. Whether or not you plan to attend your special
meeting, please take the time to vote by completing and mailing the enclosed
proxy card to us. If you date and mail your proxy card without indicating how
you want to vote, your proxy will be counted as a vote for the merger in the
case of the Snyder meeting, or as a vote for the merger and the election of
directors in the case of the Santa Fe meeting. If you do not return your card,
or do not instruct your broker how to vote any shares held for you in your
broker's name, the effect will be a vote against the merger.
 
  This document constitutes a prospectus of Santa Fe relating to the issuance
of Santa Fe common stock in connection with the merger and a joint proxy
statement for both Santa Fe and Snyder in connection with the solicitation of
proxies by the Santa Fe board of directors for use at the Santa Fe special
meeting and by the Snyder board of directors at the Snyder special meeting.
This document provides you with detailed information about the proposed merger.
In addition, you may obtain information about our companies from other
documents that we have filed with the Securities and Exchange Commission. We
encourage you to read this entire document carefully.
 
  Each of our boards of directors has determined that the terms of the merger
agreement and the merger are fair to and in the best interests of our
stockholders and has approved and adopted the merger agreement. Accordingly,
the Santa Fe board of directors recommends that Santa Fe stockholders vote for
approval and adoption of the merger agreement, including the issuance of Santa
Fe common stock in the merger, and the election of the five nominees for
director and the Snyder board of directors recommends that Snyder stockholders
vote for approval and adoption of the merger agreement.

   See "Risk Factors" beginning on page 14 for a discussion of certain matters
 which you should consider before voting on the merger at the special meetings.
 
  Neither the Securities and Exchange Commission nor any state securities
regulators have approved the merger, the Santa Fe common stock to be issued in
the merger or the fairness or the merits of the merger or has determined
whether the information contained in this document is accurate or adequate. Any
representation to the contrary is a criminal offense.
 
  Joint Proxy Statement/Prospectus dated      , 1999, and first mailed to 
Santa Fe and Snyder stockholders on      , 1999.

<PAGE>
 
                               TABLE OF CONTENTS
<TABLE>
<S>                                                                          <C>
Questions and Answers about the Merger.....................................    i
Summary....................................................................    1
 The Companies.............................................................    1
 Special Meetings..........................................................    1
 The Merger................................................................    2
 Comparative Per Share Market Price Information............................    4
 Listing of Santa Fe Common Stock..........................................    4
 Forward Looking Statements................................................    4
 Recent Developments.......................................................    5
 Commonly Used Oil and Gas Terms...........................................    5
 Selected Historical Consolidated Financial and Operating Data.............    7
  Santa Fe.................................................................    7
  Snyder...................................................................    9
 Summary Unaudited Pro Forma Combined Financial Data.......................   11
 Summary Oil and Gas Reserve Information...................................   12
 Comparative Per Share Data................................................   13
Risk Factors...............................................................   14
 Risk Factors Relating to the Merger.......................................   14
  Inherent Challenges in Combining Santa Fe and Snyder.....................   14
  Value of Santa Fe Stock to be Received in the Merger May Fluctuate.......   14
  Santa Fe Snyder's Business Will Be Affected By Different Factors.........   14
 Risk Factors Relating to the Combined Company.............................   14
  Volatility of Oil and Natural Gas Prices May Affect Financial Results....   14
  Possible Writedowns of Properties' Carrying Values.......................   15
  International Operations May Be Subject to Additional Risks .............   15
  Costs Related to Environmental and Other Governmental Regulations........   16
  Estimates of Proved Reserves May Change..................................   16
  Santa Fe Snyder Faces Strong Competition.................................   16
  Santa Fe Snyder May Not Be Able to Replace Reserves......................   17
  Some Hazard Losses May Not Be Insured....................................   17
  Restrictions on Payment of Dividends.....................................   17
Business of Santa Fe Snyder Following the Merger...........................   18
The Merger.................................................................   20
 General...................................................................   20
 Consideration.............................................................   20
 Amendments to Santa Fe's Certificate of Incorporation.....................   20
 Election of New Directors and Appointment of Executive Management.........   20
 Ownership of Santa Fe Snyder Following the Merger.........................   20
 Background of the Merger..................................................   20
 Reasons for the Merger--Santa Fe..........................................   24
 Reasons for the Merger--Snyder............................................   26
 Opinions of Financial Advisors............................................   27
  Santa Fe's Financial Advisors............................................   27
  Chase Opinion............................................................   28
  DLJ Opinion..............................................................   33
  Snyder's Financial Advisor...............................................   38
 Accounting Treatment......................................................   50
 Material U.S. Federal Income Tax Consequences.............................   50
 Regulatory Matters; Certain Legal Matters.................................   51
 No Appraisal Rights.......................................................   52
 Federal Securities Laws Consequences; Resale Restrictions.................   52
Comparative per Share Market Price and Dividend Information................   53
</TABLE>
<TABLE>
<S>                                                                         <C>
Interests of Certain Directors and Officers in the Merger..................  54
The Merger Agreement.......................................................  57
 Structure; Effective Time.................................................  57
 Conversion or Cancellation of Shares of Snyder Common Stock in the
  Merger...................................................................  57
 Santa Fe Board of Directors and Board Committees..........................  57
 Employee Stock Options....................................................  57
 Conversion of Shares......................................................  58
 Conduct of Business Prior to Merger.......................................  58
 Covenants and Agreements..................................................  59
 Certain Representations and Warranties....................................  61
 Conditions to the Merger..................................................  61
 Termination of the Merger Agreement.......................................  62
 Termination Expenses......................................................  63
 Amendments; No Waivers....................................................  64
Snyder Special Meeting.....................................................  65
 Time and Place; Purpose...................................................  65
 Record Date; Voting Rights and Proxies....................................  65
 Solicitation of Proxies...................................................  65
 Quorum....................................................................  66
 Required Vote, Failure to Vote and Broker Non-Votes.......................  66
Santa Fe Special Meeting...................................................  67
 Time and Place; Purpose...................................................  67
 Record Date; Voting Rights and Proxies....................................  67
 Solicitation of Proxies...................................................  68
 Quorum....................................................................  68
 Required Vote, Failure to Vote and Broker Non-Votes.......................  68
Directors and Officers of Santa Fe Snyder Following the Merger.............  69
Comparison of Stockholder Rights...........................................  69
 General...................................................................  69
 Summary Comparison of Terms of Santa Fe Common Stock and Snyder Common
  Stock....................................................................  70
  Authorized Capital Stock; Amendment of Charter...........................  70
  Board of Directors.......................................................  70
  Adjournment of Stockholder Meetings......................................  71
  Notice of Stockholder Meetings...........................................  72
  Special Meetings of Stockholders.........................................  73
  Stockholder Consent in Lieu of Meeting...................................  73
  Amendment of Corporate Charter and Bylaws................................  73
  Removal of Officers......................................................  74
  Snyder Rights Plan.......................................................  74
  Santa Fe Rights Plan.....................................................  75
Description of Santa Fe Capital Stock......................................  77
 Authorized Capital Stock..................................................  77
 Common Stock..............................................................  77
 Preferred Stock...........................................................  77
 Transfer Agent and Registrar..............................................  77
 Stock Exchange Listing; Delisting and Deregistration of Snyder Common
  Stock....................................................................  77
Election of Directors......................................................  78
Legal Matters..............................................................  79
Experts....................................................................  79
Future Stockholder Proposals...............................................  79
Where You Can Find More Information........................................  80
Index To Financial Statements.............................................. F-1
 Annex A--Agreement and Plan of Merger
 Annex B--Opinion of Donaldson, Lufkin & Jenrette Securities Corporation
 Annex C--Opinion of Chase Securities Inc.
 Annex D--Opinion of Petrie Parkman & Co., Inc.
</TABLE>
<PAGE>
 
                     QUESTIONS AND ANSWERS ABOUT THE MERGER
 
   Q: Why are Santa Fe and Snyder proposing to merge? How will I benefit?
 
   A: The combination of Santa Fe and Snyder is intended to create a larger,
more diversified, financially stronger and more cost efficient enterprise. We
believe that the merger will result in many benefits to the combined company
not available to either Santa Fe or Snyder alone, including the following:
 
  . A more balanced asset and cash flow base, with estimated 1999 production
    comprised of 55% gas and 45% oil;
 
  . An improved balance of domestic and international operations, with
    estimated 1998 pro forma combined year-end reserves of 65% domestic and
    35% international;
 
  . A stronger balance sheet, with improved credit statistics and greater
    financial flexibility and access to capital;
 
  . A greater financial capacity to pursue domestic and international
    acquisitions;
 
  . A more competitive cost structure, enabling the combined company to
    compete more effectively over the long term; and
 
  . A larger scale operation in the Gulf of Mexico, creating increased
    operational efficiencies and lower general and administrative costs, and
    affording the opportunity to select among the highest quality projects of
    the two companies.
 
   The merger is subject to risks, including:
 
  . Challenges inherent in combining two independent companies; and
 
  . The exchange ratio at which Snyder common stock will be exchanged for
    Santa Fe common stock in the merger is fixed and will not be adjusted for
    changes in the stock price of either company before the merger is
    completed.
 
   To review the reasons for the merger and related risks in greater detail,
see pages 14-27.
 
   Q: How will the merger work?
 
   A: Snyder will merge into Santa Fe and Santa Fe will be the surviving
corporation. Santa Fe will issue its common stock to the existing Snyder
stockholders in exchange for their existing Snyder common stock. In connection
with the merger, Santa Fe will be renamed "Santa Fe Snyder Corporation."
 
   Q: How will the merger affect Snyder stockholders? What will Snyder
stockholders receive for their shares?
 
   A: Each outstanding share of Snyder common stock will be converted to 2.05
shares of Santa Fe common stock. As a result, the Snyder common stockholders as
a group will hold approximately 40% of the total number of outstanding shares
of Santa Fe Snyder's common stock after the merger.
 
   Q: Will Santa Fe stockholders receive any shares in the merger?
 
   A: No. Santa Fe stockholders will continue to hold the Santa Fe common stock
they own at the time of the merger. After the merger, these shares will
represent approximately 60% of the outstanding shares of common stock of Santa
Fe Snyder. Santa Fe stockholders do not need to take any action with respect to
their stock certificates.
 
   Q: Where will my shares trade after the merger?
 
   A: We expect that the common stock of Santa Fe Snyder will trade on the New
York Stock Exchange under the new trading symbol "SFS."
 
   Q: What do I need to do now?
 
   A: Indicate on the enclosed proxy how you want to vote, sign it and mail it
in the enclosed return envelope as soon as possible so that your shares will be
represented at your special meeting. If you sign and send in your proxy card
and do not indicate how you want to vote, your proxy will be counted as a vote
in favor of the proposals submitted
<PAGE>
 
at your special meeting. The failure to return your proxy card will have the
same effect as voting against the merger.
 
   The Santa Fe special meeting and the Snyder special meeting will each take
place on      , 1999. You may attend your special meeting and vote your shares
in person, rather than signing and mailing your proxy card. In addition, you
may revoke your proxy on or before the day of your special meeting by
following the instructions on pages 65-68. You then may either change your
vote or attend your special meeting and vote in person.
 
   Q: Should I send in my stock certificates now?
 
   A: No. If the merger is completed we will send Snyder stockholders written
instructions for exchanging their share certificates. Santa Fe stockholders
will keep their certificates.
 
   Q: What do I do if I want to change my vote?
 
   A: Send in a later-dated, signed proxy card before your special meeting or
attend the meeting in person and vote.
 
   Q: If my shares are held in "street name" by my broker, will my broker vote
my shares for me?
 
   A: Your broker will vote your shares only if you provide instructions on
how to vote. You should instruct your broker to vote your shares, following
the directions provided by your broker. Without instructions, your shares will
not be voted.
 
   Q: Will I have appraisal rights if I do not vote for the merger and the
merger occurs anyway?
 
   A. Holders of Snyder and Santa Fe common stock will not have any appraisal
rights in connection with the merger, even if they do not vote at the special
meeting or they vote against the merger.
 
   Q: Will I owe any federal income tax as a result of the merger?
 
   A: No, unless you receive cash for fractional Santa Fe shares. Each Snyder
stockholder will have to pay tax on the difference, if any, between the cash
received for fractional shares and such stockholder's adjusted tax basis in
the stockholder's fractional share interest. The exchange of shares by Snyder
stockholders will be otherwise tax-free to Snyder stockholders for federal
income tax purposes. Santa Fe stockholders will not incur taxes upon
consummation of the merger.
 
   Q: When do you expect the merger to be completed?
 
   A: We are working toward completing the merger as quickly as possible. Both
Snyder and Santa Fe stockholders must approve the merger. We hope to complete
the merger by      , 1999.
 
   Q: What happens to my future dividends?
 
   A: Currently Snyder is paying quarterly dividends in the amount of $.065
per share, while Santa Fe is not paying dividends. The dividend policy for
Santa Fe Snyder following the merger has not yet been established. The amount
of dividends, if any, paid by Santa Fe Snyder in the future will depend on
business conditions, its financial condition and earnings, and other factors.
 
   Q: Whom should I call with questions?
 
   A: If you have any questions about the merger, please call Snyder Investor
Relations, at (817) 882-5937 or Santa Fe Investor Relations, at
(713) 507-5307. In addition, you may contact our proxy solicitor,
                 , at (800)                .
 
   If you would like copies of any of the documents we refer to in this
document, you should call Santa Fe at (   )           if the document relates
to Santa Fe, or call Snyder at (   )         if the document relates to
Snyder.
 
   Q: Where can I find more information about the companies?
 
   A: Both of our companies file periodic reports with the Securities and
Exchange Commission. You may read and copy this information at the Securities
and Exchange Commission's public reference facilities. Please call the
Securities and Exchange Commission at 1-800-SEC-0330 for information about
these facilities. This information is also available through the Internet at
the Edgar database maintained by the SEC at http://www.sec.gov and at the
offices of the New York Stock Exchange.
 
                                      ii
<PAGE>
 
                                    SUMMARY
 
   This summary highlights selected information from this document and may not
contain all of the information that is important to you. To understand the
merger fully and for a more detailed description of the legal terms of the
merger, you should read carefully this entire document and the documents to
which we have referred you. See "Where You Can Find More Information" on page
80.
                                 The Companies
 
Snyder Oil Corporation
 
777 Main Street, Suite 1400
Fort Worth, Texas 76102
Telephone: (817) 338-4043
 
Snyder is engaged in the production, development, acquisition and exploration
of domestic oil and gas properties, primarily in the Gulf of Mexico, the Rocky
Mountains and northern Louisiana. Snyder also has investments in two
international exploration and production companies, SOCO International plc and
Cairn Energy plc. Snyder's shares are traded on the New York Stock Exchange
under the symbol "SNY."
 
At December 31, 1998, Snyder had estimated proved net reserves of oil and
natural gas totaling 100.3 MMBOE, of which approximately 82% were natural gas.
Average daily production by Snyder during 1998 was 30.9 MBOE per day, of which
83% was gas.
 
Santa Fe Energy Resources, Inc.
 
1616 South Voss Road, Suite 1000
Houston, Texas 77057
Telephone: (713) 507-5000
 
Santa Fe is a worldwide oil and gas exploration and development company with
domestic operations in the Permian basin of West Texas and Southeast New
Mexico, the Gulf of Mexico and international activities in Indonesia,
Argentina, Gabon, China, Brazil, Cote d'Ivoire, Malaysia and Ghana. Santa Fe is
listed on the New York Stock Exchange under the symbol "SFR."
 
At December 31, 1998, Santa Fe had estimated worldwide proved net reserves of
oil and natural gas totaling 214.9 million barrels of oil equivalent,
consisting of approximately 168.5 million barrels of oil and approximately
278.1 billion cubic feet of natural gas, of which approximately 53% were
international and 47% were domestic. Average daily production by Santa Fe
during 1998 was approximately 70.4 MBOE per day, of which 58% was oil.
 
                                Special Meetings
 
Time and Location of Special Meetings
 
Snyder. The Snyder special meeting will be held at [TIME] on [DATE], 1999, at
[LOCATION], [ADDRESS], Texas.
 
Santa Fe. The Santa Fe special meeting will be held at [TIME] on [DATE], 1999,
at [LOCATION], [ADDRESS], Texas.
 
Board Recommendations to Stockholders (see pages 24--27)
 
Snyder Stockholders. The Snyder board of directors believes that the merger is
fair to you and in your best interests and unanimously recommends that you vote
"for" approval of the merger and the related merger agreement.
 
Santa Fe Stockholders. The Santa Fe board of directors believes that the merger
is fair to you and in your best interests and unanimously recommends that you
vote "for"
 
 . approval of the merger, the related merger agreement and the issuance of
  Santa Fe common stock in exchange for Snyder common stock, and
 
 . the election of the five Snyder nominees to the Santa Fe Snyder board of
  directors.
 
Record Date; Voting Power
 
Snyder. You are entitled to vote at the Snyder special meeting if you owned
Snyder shares as of the close of business on      , 1999, the
<PAGE>
 
Snyder record date. You may cast one vote for each share of Snyder common stock
you own.
 
Santa Fe. You are entitled to vote at the Santa Fe special meeting if you owned
Santa Fe shares as of the close of business on      , 1999, the Santa Fe record
date. You may cast one vote for each share of Santa Fe common stock you own.
 
Stockholder Vote Required to Approve the Merger
 
Snyder. Approval of the merger and the related merger agreement requires the
favorable vote of the holders of a majority of the outstanding shares of Snyder
common stock. Your failure to vote will have the effect of a vote against the
merger.
 
Santa Fe. Approval of the merger, the related merger agreement and the issuance
of Santa Fe common stock in exchange for Snyder common stock requires the
favorable vote of the holders of a majority of the outstanding shares of Santa
Fe common stock. Your failure to vote will have the effect of a vote against
the merger.
 
The election by Santa Fe stockholders of each of the five Snyder nominees
requires the favorable vote of the holders of at least a plurality of the votes
cast where a quorum is present. In a contest among more than two candidates, a
candidate receiving more votes than any other candidate has received a
plurality of the votes. Your failure to vote will have the effect of a vote
against the election of the Snyder nominees.
 
Share Ownership of Snyder Management
 
As of the record date for the Snyder special meeting, Snyder directors and
executive officers owned approximately 7.65% of the outstanding shares of
Snyder common stock.
 
The directors and executive officers of Snyder have indicated that they intend
to vote the Snyder common stock owned by them "for" approval of the merger and
the related merger agreement.
 
Share Ownership of Santa Fe Management
 
As of the record date for the Santa Fe special meeting, Santa Fe directors and
executive officers owned approximately 5.76% of the outstanding shares of Santa
Fe common stock. These shares include shares that may be deemed owned by a
partnership of which one of the directors is a partner.
 
The directors and executive officers of Santa Fe have indicated that they
intend to vote the Santa Fe common stock owned by them "for" approval of the
merger and the related merger agreement and the election of the five Snyder
nominees to the board of Santa Fe Snyder.
 
                                   The Merger
 
The merger agreement is attached at the back of this document as Annex A. We
encourage you to read this agreement, as it is the legal document that governs
the merger.
 
Directors and Officers of Santa Fe Snyder Following the Merger (see page 69)
 
In connection with the merger, Santa Fe stockholders will be asked to elect
five director nominees to serve on the Santa Fe Snyder board of directors. The
Snyder board of directors designated these individuals. The persons nominated
to serve as such directors are John C. Snyder,       ,       ,        and
      . Mr. Snyder will become the Chairman of the Board.
 
After the merger, the management of Santa Fe Snyder will include the following
executive officers:
 
James L. Payne--Chief Executive Officer (currently Chairman of the Board,
President and Chief Executive Officer of Santa Fe).
 
Hugh L. Boyt--President--International (currently President and Chief Operating
Officer of Santa Fe).
 
William G. Hargett--President--North America (currently President, Chief
Operating Officer and director of Snyder).
 
Duane C. Radtke--Executive Vice President--Production (currently Senior Vice
President--Production of Santa Fe).
 
Tim S. Parker--Executive Vice President--Exploration (currently Senior Vice
President--Exploration of Santa Fe).
 
Mark A. Jackson--Executive Vice President and Chief Financial Officer
(currently Senior Vice President and Chief Financial Officer of Snyder).
 
                                       2
<PAGE>
 
 
Janet F. Clark--Executive Vice President--Corporate Development and
Administration (currently Senior Vice President, Chief Financial Officer and
Treasurer of Santa Fe).
 
David L. Hicks--Vice President--Law and General Counsel (currently Vice
President--Law and General Counsel of Santa Fe).
 
Interests of Certain Snyder Officers and Directors in the Merger (See page 54)
 
You should be aware that certain Snyder officers and directors have agreements,
stock options and other benefit plans that may provide them with interests in
the merger that are different from yours. Generally, the merger would result in
the acceleration of severance and payment rights under such agreements, options
and plans. The board of Snyder was aware of these interests and considered them
in approving the merger.
 
Interests of Certain Santa Fe Officers and Directors in the Merger (See page
55)
 
You should be aware that Melvyn N. Klein, a director of Santa Fe, is also the
sole stockholder of a general partner of GKH Partners, L.P. Santa Fe has agreed
to pay to GKH Partners, L.P. a financial advisory fee in the amount of $500,000
upon consummation of the merger.
 
You should be aware that certain Santa Fe officers and directors have
agreements, stock options and other benefit plans that may provide them with
interests in the merger that are different from yours. Generally, the merger
would result in the acceleration of severance and payment rights under such
agreements, options and plans. The board of Santa Fe was aware of these
interests and considered them in approving the merger.
 
Conditions to the Merger (See page 61)
 
Snyder and Santa Fe will not complete the merger unless the conditions of the
merger agreement are satisfied or, if permitted, waived by them. We cannot
guarantee that all of the required conditions will be satisfied or waived or
that the merger will take place. Please refer to the main body of this document
for a detailed description of the required conditions.
 
Termination of the Merger Agreement (See page 62)
 
The boards of directors of Snyder and Santa Fe may jointly agree in writing to
terminate the merger agreement without completing the merger. The merger
agreement may also be terminated in other circumstances including the
following:
 
 . the merger is not completed by June 30, 1999;
 
 . the stockholders of either company fail to approve the merger; or
 
 . either of our boards of directors accepts a merger or business combination
  with or acquisition by another company after concluding that such action is
  necessary for such board to act in a manner consistent with its fiduciary
  duties.
 
Termination Fee (See page 63)
 
Each of Santa Fe and Snyder would be required to pay to the other party a $25
million termination fee and reimburse the other party's expenses, if:
 
 . it accepts a merger or business combination with or acquisition by another
  company;
 
 . its board of directors withdraws or modifies its recommendation of the
  merger; or
 
 . its stockholders fail to approve the merger or it materially breaches any
  covenant or agreement in the merger agreement, and within nine months
  thereafter it accepts a merger or business combination with or acquisition by
  another company.
 
Regulatory Approvals (See page 51)
 
The Hart-Scott-Rodino Antitrust Improvements Act of 1976 prohibits us from
completing the merger until after we have provided certain information and
materials to the United States Federal Trade Commission and the Antitrust
Division of the United States Department of Justice, and we have waited the
required period of time. We expect to file premerger notification forms with
the Federal Trade Commission and the Department of Justice on or about February
8, 1999. The waiting period would expire 30 days after such filing, although
the Federal Trade Commission may terminate it on an earlier date.
 
                                       3
<PAGE>
 
 
Fairness Opinions of Financial Advisors (See page 27)
 
Snyder's Fairness Opinion. In deciding to approve the combination with Santa
Fe, Snyder's board of directors considered, as one of many factors, an oral
opinion of January 13, 1999 from Petrie Parkman & Co., Inc. to Snyder's board
of directors that, as of that date and based upon and subject to the matters
described in the opinion, the exchange ratio is fair from a financial point of
view to holders of Snyder common stock. Petrie Parkman subsequently confirmed
that opinion in writing. A copy of this opinion is attached as Annex D to this
document. We encourage you to read this opinion carefully before voting on the
merger.
 
Santa Fe's Fairness Opinions. In deciding to approve the merger, Santa Fe's
board of directors considered, as one of many factors, oral opinions of January
13, 1999 from Donaldson, Lufkin & Jenrette Securities Corporation and Chase
Securities Inc. to Santa Fe's board of directors that, as of that date and
based upon and subject to the matters described in the opinions, the exchange
ratio is fair to the Santa Fe stockholders from a financial point of view. DLJ
and Chase subsequently confirmed these opinions in writing. A copy of each of
these opinions is attached as Annexes B and C to this document. We encourage
you to read these opinions carefully before voting on the merger.
 
Material U.S. Federal Income Tax Consequences (See page 50)
 
We have structured the merger so that you will not recognize any gain or loss
for U.S. federal income tax purposes as a result of the merger, except for
taxes payable by each Snyder stockholder on the difference, if any, between
cash received for fractional shares and such stockholder's adjusted tax basis
in the stockholder's fractional share interest. The adjusted tax basis and
holding periods of the Santa Fe common stock received by Snyder stockholders
will be the same as the adjusted tax basis (reduced by any tax basis allocable
to fractional shares exchanged for cash) and holding periods of the shares of
Snyder common stock exchanged therefor.
 
As a condition to the merger, both Santa Fe and Snyder must receive an opinion
from their respective tax counsels that the merger will be tax-free unless such
conditions are waived. Neither Santa Fe nor Snyder intends to waive these
conditions.
 
Tax matters are very complicated and the tax consequences of the merger to you
will depend on the facts of your own situation. You are urged to consult your
own tax advisor for a full understanding of the tax consequences of the merger
to you.
 
Accounting Treatment (See page 50)
 
The merger will be accounted for by the combined company under the "purchase"
method of accounting.
 
No Appraisal Rights (See page 52)
 
Under Delaware law, neither Snyder stockholders nor Santa Fe stockholders have
any right to an appraisal of the value of their shares in connection with the
merger.
 
                       Comparative Per Share Market Price
                           Information (See page 53)
 
Snyder. On January 13, 1999, the last full trading day prior to the public
announcement of the proposed merger, Snyder common stock closed at $13 7/16 per
share. On      , 1999, Snyder common stock closed at $   per share.
 
Santa Fe. On January 13, 1999, the last full trading day prior to the public
announcement of the proposed merger, Santa Fe common stock closed at $6 9/16
per share. On      , 1999, Santa Fe common stock closed at $   per share.
 
                        Listing of Santa Fe Common Stock
 
Santa Fe will list the shares of its common stock to be issued in the merger on
the New York Stock Exchange.
 
                           Forward Looking Statements
 
This document includes "forward looking statements" as defined by the
Securities and Exchange Commission. Such statements are those concerning the
companies' plans, expectations and objectives for future operations. All
statements, other than statements of historical facts,
 
                                       4
<PAGE>
 
included in this document that address activities, events or developments that
the companies expect, believe or anticipate will or may occur in the future are
forward looking statements. This includes completion of the proposed merger,
reserve estimates, future production of oil and gas, future financial
performance and other matters. These statements are based on assumptions, which
the companies believe are reasonable, but which are subject to a wide range of
uncertainties and business risks. Factors that could cause actual results to
differ materially from those anticipated are discussed in both companies'
periodic filings with the Securities and Exchange Commission, including their
Annual Reports on Form 10-K for the year ended December 31, 1997.
 
"Safe Harbor" Statement under the Private Securities Litigation Reform Act of
1995: Statements in this document regarding each company's business which are
not historical facts are "forward looking statements" that involve risks and
uncertainties. For a discussion of such risks and uncertainties, which could
cause actual results to differ from those contained in the forward looking
statements, see "Risk Factors" on page 14 of this document.
 
                              Recent Developments
 
Santa Fe 1998 Financial Results. On January 27, 1999, Santa Fe reported
financial results for the year ended December 31, 1998. Santa Fe reported a net
loss of $98.7 million, or $0.96 per share, for 1998, including a pre-tax charge
of $87.8 million for property impairments ($57.1 million on an after-tax basis)
compared with pro forma earnings to common stock of $23.2 million, or $0.24 per
share, for the full year 1997, excluding the results of Monterey Resources
which was spun off to the stockholders of Santa Fe in July 1997. The impairment
charge relates primarily to properties located in the Gulf of Mexico and was
required principally due to lower commodity price expectations. Santa Fe's 1998
cash flow from operations declined to $115.1 million compared with $193.2
million for 1997, despite a 34 percent increase in oil production. The primary
cause of the decline in cash flow from operations was a 35 percent decline in
crude oil prices and a 15 percent decline in natural gas prices. Total reserves
at year end were estimated to be 214.9 million barrels of oil equivalent, a 26
percent increase from the 171.1 million barrels of oil equivalent at the
beginning of the year. The estimates of proved reserves are based on a report
of Ryder Scott Company Petroleum Engineers as of January 1, 1999, except that
reserves attributable to Santa Fe's interest in the Jabung field in Indonesia
are based on company estimates.
 
Stockholder Litigation. On January 15, 1999, a stockholder of Snyder filed a
putative class action complaint in the Delaware Court of Chancery, No. 16900-
NC, seeking to enjoin the merger on the proposed terms and seeking damages.
Defendants named in the complaint are Snyder, each of its directors and Santa
Fe. The plaintiff alleges numerous breaches of the duties of care and loyalty
owed by Snyder and its directors to the purported class in connection with
entering into the merger agreement with Santa Fe. The plaintiff further alleges
that Santa Fe aided and abetted Snyder and its directors in their alleged
breaches of fiduciary duty. The defendants believe the complaint is without
merit and intend to vigorously defend the action.
 
                        Commonly Used Oil and Gas Terms
 
The following are abbreviations and definitions of terms commonly used in the
oil and gas industry and this document. Unless otherwise indicated in this
document, natural gas volumes are stated at the legal pressure base of the
state or area in which the reserves are located and at 60 degrees Fahrenheit.
 
"Bbl" means a barrel of 42 U.S. gallons of oil.
 
"Bcf" means billion cubic feet of natural gas.
 
"BOE" means barrels of oil equivalent. BOEs are determined using the ratio of
six Mcf of natural gas to one Bbl of oil.
 
"BOEPD" means barrels of oil equivalent per day.
 
"Btu" or "British Thermal Unit" means the quantity of heat required to raise
the temperature of one pound of water by one degree Fahrenheit.
 
                                       5
<PAGE>
 
 
"MBbls" means thousand barrels of oil.
 
"MBOE" means thousand barrels of oil equivalent.
 
"Mcf" means thousand cubic feet of natural gas.
 
"Mcfe" means a thousand cubic feet equivalent, which is determined using the
ratio of one barrel of oil, condensate or natural gas liquids to six Mcf of
natural gas.
 
"MMBbls" means million barrels of oil.
 
"MMBOE" means million barrels of oil equivalent.
 
"MMBtu" means million British Thermal Units.
 
"MMcf" means million cubic feet of natural gas.
 
"Present Value of Future Net Revenues" or "Present Value of Proved Reserves"
means the present value of estimated future revenues to be generated from the
production of proved reserves calculated in accordance with Securities and
Exchange Commission guidelines, net of estimated production and future
development costs, using prices and costs as of the date of estimation without
future escalation, without giving effect to non-property related expenses such
as general and administrative expenses, debt service, future income tax expense
and depreciation, depletion and amortization, and discounted using an annual
discount rate of 10%.
 
"Standardized Measure of Discounted Future Net Cash Flows" means the Present
Value of Future Net Revenues after income taxes discounted at 10%.
 
                                       6
<PAGE>
 
         Selected Historical Consolidated Financial and Operating Data
 
                        Santa Fe Energy Resources, Inc.
 
   The following table sets forth selected financial information of Santa Fe
for the five years ended December 31, 1997 and for the nine months ended
September 30, 1998 and September 30, 1997. Such financial information was
derived from the consolidated financial statements of Santa Fe. This data
should be read in conjunction with the consolidated financial statements of
Santa Fe, the related notes thereto, and Management's Discussion and Analysis
of Financial Condition and Results of Operations contained in the reports
incorporated herein by reference.
 
<TABLE>
<CAPTION>
                                                                            Nine Months
                                                                               Ended
                                   Year Ended December 31,                 September 30,
                         -----------------------------------------------  ----------------
                          1997      1996      1995      1994      1993     1998     1997
                         -------  --------  --------  --------  --------  -------  -------
                                    (in millions, except per share data)
<S>                      <C>      <C>       <C>       <C>       <C>       <C>      <C>
Consolidated Selected
 Financial Data,
 including Monterey
Income Statement Data
 Revenues............... $ 514.7  $  583.3  $  449.4  $  404.2  $  449.5  $ 222.5  $ 425.5
 Production and
  operating expenses....   180.9     209.2     162.3     162.8     180.6     81.3    156.3
 Exploration expenses...    49.1      34.5      23.4      20.4      31.0     43.2     29.0
 General and
  administrative........    28.1      30.1      26.9      27.3      32.3     14.1     22.2
 Depreciation, depletion
  and amortization .....   127.8     148.2     133.2     121.3     152.7     98.6    100.0
 Impairments............      --      57.4      30.2        --      99.3       --       --
 Income (loss) from
  operations............   110.8      89.5      53.9      48.2    (113.0)   (28.4)   103.8
 Interest expense, net..    17.1      32.4      26.7      23.9      41.5      9.6     15.5
 Income (loss) before
  extraordinary item....    54.7      42.4      26.6      17.1     (77.1)   (17.7)    55.8
 Extraordinary item.....      --      (6.0)       --        --        --       --       --
 Net income (loss)......    54.7      36.4      26.6      17.1     (77.1)   (17.7)    51.1
 Earnings (loss)
  attributable to
  common shares.........    42.7     (10.8)     11.8       5.4     (84.1)   (17.7)    39.0
 Basic and diluted per
  share data
  Before extraordinary
   item................. $  0.43  $  (0.05) $   0.13  $   0.06  $  (0.94) $ (0.17) $  0.40
  Extraordinary item--
   debt extinguishment..      --     (0.07)       --        --        --       --       --
  Per common share...... $  0.43  $  (0.12) $   0.13  $   0.06  $  (0.94) $ (0.17) $  0.40
 Weighted average number
  of shares
  outstanding...........    98.6      90.6      90.2      89.9      89.7    102.7     97.1
Statement of Cash Flows
 Data
 Net cash provided by
  operating activities..   254.6     228.1     174.5     124.5     160.2     90.3    220.3
 Net cash provided by
  (used in) investing
  activities............  (375.6)   (206.8)   (160.8)    (57.7)   (121.4)  (257.8)  (322.2)
 Net cash provided by
  (used in) financing
  activities............   112.0     (49.3)    (24.8)    (17.9)   (117.8)   175.7     92.7
Balance Sheet Data (at
 period end)
 Properties and
  equipment, net........ $ 649.7  $  909.8  $  889.5  $  843.0  $  832.7  $ 765.7  $ 612.5
 Total assets...........   788.9   1,129.1   1,073.8   1,081.0   1,076.9    901.5    725.9
 Long-term debt.........   121.7     278.5     344.4     350.4     405.4    306.2    102.5
 Convertible preferred
  stock.................      --      19.7      80.0      80.0      80.0       --       --
 Stockholders' equity...   454.7     526.8     437.7     423.3     323.6    430.1    450.6
 Cash dividends declared
  per common share...... $    --  $     --  $     --  $     --  $   0.12  $    --  $    --
</TABLE>
 
                                       7
<PAGE>
 
 
   On July 25, 1997 Santa Fe completed the spin-off of Monterey Resources, Inc.
As a result of this transaction, in management's opinion, the consolidated
historical results are not representative of the Santa Fe's on-going
operations. The following unaudited supplemental financial information reflects
the financial results of Santa Fe adjusted to exclude the financial results
attributable to Monterey and its predecessor operations, the Western Division
of Santa Fe.
 
<TABLE>
<CAPTION>
                                                                     Nine Months
                                                                        Ended
                               Year Ended December 31,              September 30,
                         ----------------------------------------  ----------------
                          1997     1996    1995    1994    1993     1998     1997
                         -------  ------  ------  ------  -------  -------  -------
                                 (in millions, except per share data)
<S>                      <C>      <C>     <C>     <C>     <C>      <C>      <C>
Income Statement Data
 Revenues............... $ 333.5  $290.4  $230.7  $212.3  $ 250.0  $ 222.5  $ 244.3
 Production and
  operating expenses....    87.6    80.6    69.7    63.7     67.8     81.3     63.0
 Exploration expenses...    48.2    32.8    21.0    19.0     29.3     43.2     28.1
 General and
  administrative........    20.5    21.1    19.6    19.5     23.1     14.1     14.6
 Depreciation, depletion
  and amortization......   105.5   110.7   100.8    89.3    111.5     98.6     77.7
 Impairments............      --    57.4    30.2      --     50.2       --       --
 Income (loss) from
  operations............    60.6   (17.2)  (22.2)    6.1    (78.1)   (28.4)    53.6
 Interest expense, net..     6.4     8.6     1.6    (1.9)    14.6      9.6      4.8
 Income (loss) before
  extraordinary item....    35.2    (6.8)   (4.3)    6.6    (53.3)   (17.7)    31.6
 Extraordinary item.....      --    (1.5)     --      --       --       --       --
 Net income (loss)......    35.2    (8.3)   (4.3)    6.6    (53.3)   (17.7)    31.6
 Earnings (loss)
  attributable to
  common shares......... $  23.2  $(55.5) $(19.1) $ (5.1) $ (60.3) $ (17.7) $  19.5
 Basic and diluted per
  share data
  Before extraordinary
   item................. $  0.24  $(0.59) $(0.21) $(0.06) $ (0.67) $ (0.17) $  0.20
  Extraordinary item--
   debt extinguishment..      --   (0.02)     --      --       --       --       --
  Per common share...... $  0.24  $(0.61) $(0.21) $(0.06) $ (0.67) $ (0.17) $  0.20
 Weighted average number
  of shares
  outstanding...........    98.6    90.6    90.2    89.9     89.7    102.7     97.1
Statement of Cash Flows
 Data
 Net cash provided by
  operating activities..   193.2   141.8    98.8    78.8    112.7     90.3    158.8
 Net cash provided by
  (used in) investing
  activities............  (208.3)  (92.2)  (85.1)  (24.6)   (79.3)  (257.8)  (154.9)
 Net cash provided by
  (used in) financing
  activities............    15.4   (86.9)  (24.8)   (5.2)  (112.4)   175.7     (3.8)
Balance Sheet Data (at
 period end)
 Properties and
  equipment, net........ $ 649.7  $530.8  $523.0  $494.2  $ 477.3  $ 765.7  $ 612.5
 Total assets...........   788.9   681.8   674.3   696.1    690.5    901.5    725.9
 Long-term debt.........   121.7   103.5    99.4   105.4    149.0    306.2    102.5
 Convertible preferred
  stock.................      --    19.7    80.0    80.0     80.0       --       --
 Stockholders' equity...   454.7   368.9   312.6   307.6    203.7    430.1    450.6
 Cash dividends declared
  per common share...... $    --  $   --  $   --  $   --  $  0.12  $    --  $    --
</TABLE>
 
                                       8
<PAGE>
 
                             Snyder Oil Corporation
 
   The following table sets forth selected financial information of Snyder for
the five years ended December 31, 1997 and for the nine months ended September
30, 1998 and September 30, 1997. Such financial information was derived from
the consolidated financial statements of Snyder. This data should be read in
conjunction with the consolidated financial statements of Snyder, the related
notes thereto, and Management's Discussion and Analysis of Financial Condition
and Results of Operations contained in the reports incorporated herein by
reference.
 
<TABLE>
<CAPTION>
                                                                   Nine Months
                                                                      Ended
                               Year Ended December 31,            September 30,
                          --------------------------------------  ---------------
                           1997    1996    1995    1994    1993    1998     1997
                          ------  ------  ------  ------  ------  -------  ------
                                (in millions, except per share data)
<S>                       <C>     <C>     <C>     <C>     <C>     <C>      <C>
Consolidated Selected
 Financial Data,
 including Patina
 Income Statement Data
  Revenues..............  $255.7  $285.1  $197.3  $262.3  $228.9  $ 107.1  $217.9
  Production and
   operating expenses...    55.2    64.7    81.9   140.4   130.5     29.7    46.0
  Exploration expenses..    17.0     4.2     8.0     6.5     3.0     35.2    12.6
  General and
   administrative.......    20.4    17.1    17.7    12.9     6.8     12.2    16.0
  Depreciation,
   depletion and
   amortization.........    79.9    84.5    76.4    70.8    58.8     39.7    68.3
  Interest expense,
   net..................    23.0    22.9    21.7     9.7     5.3      9.3    20.6
  Income (loss) before
   extraordinary item...    35.5    63.0   (39.8)   12.4    22.5    (12.3)   29.6
  Net income (loss).....    32.6    63.0   (39.8)   12.4    19.5    (12.3)   26.7
  Earnings (loss)
   attributable to
   common shares........    26.6    56.7   (46.0)    1.6    10.4    (12.3)   22.1
  Basic and diluted per
   share data
  Before extraordinary
   item.................  $ 0.96  $ 1.81  $(1.53) $ 0.07  $ 0.58  $  0.37  $ 0.83
  Extraordinary item--
   debt extinguishment..   (0.09)     --      --      --   (0.13)      --   (0.10)
  Per common share......  $ 0.87  $ 1.81  $(1.53) $ 0.07  $ 0.45  $ (0.37) $ 0.73
  Weighted average
   number of shares
   outstanding..........    30.6    31.3    30.2    23.7    23.1     33.4    30.1
 Statement of Cash Flows
  Data
  Net cash provided by
   operating
   activities...........   122.0   101.7    69.1    86.4    68.7     55.5   104.3
  Net cash provided by
   (used in) investing
   activities...........    31.8   (62.4)   32.4  (245.5) (207.9)  (131.3)  (55.0)
  Net cash provided by
   (used in) financing
   activities...........   (92.3)  (38.7)  (96.0)  169.9   129.6     (7.3)  (54.4)
 Balance Sheet Data (at
  period end)
  Properties and
   equipment, net.......  $289.1  $651.7  $454.0  $557.5  $362.1  $ 357.2  $643.4
  Total assets..........   546.1   879.5   555.5   673.3   453.3    430.0   856.5
  Long-term debt........   173.6   372.1   234.1   300.0   115.0    173.8   343.3
  Convertible preferred
   stock................      --    10.0    10.0    10.0    22.0       --    10.0
  Stockholders' equity..   263.8   294.7   235.4   274.1   274.7    159.8   297.1
  Cash dividends
   declared per common
   share................  $ 0.26  $ 0.26  $ 0.26  $ 0.26  $ 0.26  $ 0.195  $0.195
</TABLE>
 
                                       9
<PAGE>
 
 
   In October 1997 Snyder sold its 74% interest in Patina Oil and Gas
Corporation. As a result of this transaction, in management's opinion, the
consolidated historical results are not representative of Snyder's on-going
operations. The following unaudited supplemental financial information reflects
the financial results of Snyder adjusted to exclude the financial results
attributable to Patina.
 
<TABLE>
<CAPTION>
                                                                  Nine Months
                                                                     Ended
                              Year Ended December 31,            September 30,
                         --------------------------------------  ---------------
                          1997    1996    1995    1994    1993    1998     1997
                         ------  ------  ------  ------  ------  -------  ------
                               (in millions, except per share data)
<S>                      <C>     <C>     <C>     <C>     <C>     <C>      <C>
Income Statement Data
 Revenues............... $181.7  $209.2  $152.1  $194.5  $164.0  $ 107.1  $144.5
 Production and
  operating expenses....   41.7    50.1    73.0   132.3   120.6     29.7    32.5
 Exploration expenses...   16.9     4.0     7.6     5.7     0.9     35.2    12.5
 General and
  administrative........   16.6    11.0    11.7     5.4     0.8     12.2    12.2
 Depreciation, depletion
  and amortization......   43.6    39.7    43.8    27.7    33.6     39.7    32.0
 Impairments............    7.3      --      --      --      --       --     5.1
 Interest expense, net..   10.6     8.6    16.2     5.8     2.9      9.3     8.2
 Income (loss) before
  extraordinary item....   31.1    59.4   (37.7)    9.4     9.0    (12.3)   25.2
 Extraordinary item.....   (2.8)     --      --      --      --       --      --
 Net income (loss)......   28.2    59.4   (37.7)    9.4     9.0    (12.3)   22.3
 Earnings (loss)
  attributable to common
  shares................ $ 22.3  $ 53.2  $(43.9) $ (1.4) $ (0.1) $ (12.3) $ 17.7
 Basic and diluted per
  share data
  Before extraordinary
   item................. $ 0.82  $ 1.70  $(1.46) $(0.06) $   --  $ (0.37) $ 0.68
  Extraordinary item--
   debt extinguishment..  (0.09)     --      --      --      --       --   (0.09)
  Per common share...... $ 0.73  $ 1.70  $(1.46) $(0.06) $   --  $ (0.37) $ 0.59
 Weighted average number
  of shares
  outstanding...........   30.6    31.3    30.2    23.7    23.1     33.4    30.1
Statement of Cash Flows
 Data
 Net cash provided by
  operating activities..   73.3    48.7    50.7    38.8    29.8     55.5    55.6
 Net cash provided by
  (used in) investing
  activities............   42.5   (52.6)   53.5  (149.0) (110.4)  (131.3)  (44.2)
 Net cash provided by
  (used in) financing
  activities............  (58.0)   (0.1)  (98.7)  121.2    70.9     (7.3)  (20.0)
Balance Sheet Data (at
 period end)
 Properties and
  equipment, net........ $289.1  $251.6  $239.1  $322.7  $181.0  $ 357.2  $269.5
 Total assets...........  546.1   449.2   331.0   426.6   257.4    430.0   455.0
 Long-term debt.........  173.6   174.5   234.1   220.4    54.1    173.8   173.6
 Convertible preferred
  stock.................     --    10.0    10.0    10.0    22.0       --    10.0
 Stockholders' equity...  263.8   294.7   235.4   274.1   274.7    159.8   297.1
 Cash dividends declared
  per common share...... $ 0.26  $ 0.26  $ 0.26  $ 0.26  $ 0.26  $ 0.195  $0.195
</TABLE>
 
 
                                       10
<PAGE>
 
              Summary Unaudited Pro Forma Combined Financial Data
 
   The following table sets forth summary unaudited pro forma combined
financial data that is presented to give effect to the merger, which will be
accounted for as a purchase business combination in accordance with generally
accepted accounting principles. The income statement data for the year ended
December 31, 1997 and the nine months ended September 30, 1998 is presented as
if the merger had been consummated on January 1, 1997. The balance sheet data
is presented as if the merger had been consummated on September 30, 1998. The
unaudited pro forma combined financial data are not necessarily indicative of
the results of operations or the financial position that would have occurred
had the merger been consummated on January 1, 1997, nor are they necessarily
indicative of future results of operations or financial position. The unaudited
pro forma combined revenue and expense data exclude the cost savings expected
to be realized through the consolidation of the corporate headquarters of the
two companies and the elimination of duplicate staff and expenses. The
unaudited pro forma combined financial statements should be read in conjunction
with the historical consolidated financial statements of Santa Fe and Snyder,
including the notes thereto, incorporated by reference in this document and the
unaudited pro forma condensed combined financial statements contained elsewhere
herein. See "Where You Can Find More Information" on page 80.
 
<TABLE>
<CAPTION>
                                                                   Nine Months
                                                      Year Ended      Ended
                                                     December 31, September 30,
                                                         1997         1998
                                                     ------------ -------------
                                                        (in millions, except
                                                          per share data)
<S>                                                  <C>          <C>
Income Statement Data
 Revenues...........................................    $474.4      $  325.0
 Production and operating expenses..................     114.6         104.2
 Exploration expenses...............................      65.2          78.4
 General and administrative.........................      37.0          26.3
 Depreciation, depletion, and amortization..........     183.6         170.4
 Impairments........................................       7.3            --
 Income (loss) from operations......................      87.5         (69.8)
 Interest expense, net..............................     (20.1)        (21.4)
 Net income (loss)..................................      43.9         (50.9)
 Earnings (loss) attributable to common shares......      25.9         (50.9)
 
 Earnings (loss) per common share before
  extraordinary item,
  basic and diluted.................................    $ 0.16      $  (0.30)
 Weighted average number of shares outstanding......     161.3         171.1
 
Balance Sheet Data (at period end)
 Properties and equipment, net......................                $1,511.2
 Total assets.......................................                 1,719.7
 Long-term debt.....................................                   477.2
 Stockholders' equity...............................                   844.6
 
 Cash dividends declared on common stock per share..    $ 0.05      $   0.04
</TABLE>
 
                                       11
<PAGE>
 
                    Summary Oil and Gas Reserve Information
 
   The following table sets forth summary information with respect to Santa
Fe's and Snyder's proved oil and gas reserves at December 31, 1997, and the
summary pro forma combined information with respect to proved oil and gas
reserves, assuming the merger had taken place on December 31, 1997. Snyder and
Santa Fe's historical, and Santa Fe Snyder's pro forma combined, proved oil and
gas reserve information set forth below and incorporated by reference in this
document are only estimates based primarily on reports prepared by independent
petroleum engineers as of December 31, 1997. The reserve information as of
December 31, 1997 is based upon the prices of oil and gas as of such time.
Since December 31, 1997, the prices of oil and gas have decreased substantially
and those decreases will likely have a material effect on the present value of
estimated future revenues to be generated from the production of proved
reserves as of December 31, 1998. The discounted future net cash flows set
forth or incorporated by reference in this document should not be considered as
the current market value of the estimated oil and gas reserves attributable to
Snyder's or Santa Fe's properties. In accordance with applicable requirements
of the Securities and Exchange Commission, the estimated discounted future net
cash flows from proved reserves are generally based on prices and costs as of
the date of the estimate, while actual future prices and costs may be
materially higher or lower. In addition, the 10% discount factor, which is
required by the Securities and Exchange Commission to be used to calculate
discounted future net cash flows for reporting purposes, is not necessarily the
most appropriate discount factor based on interest rates in effect from time to
time and risks associated with Snyder, Santa Fe or the oil and gas industry in
general.
 
        Summary Historical and Pro Forma Oil and Gas Reserve Information
<TABLE>
<CAPTION>
                                                  Crude             Barrels of
                                                   Oil     Natural  Equivalents
                                                 (MMBbls) Gas (Bcf)   (MMBOE)
   Net Proved Reserves (Historical):             -------- --------- -----------
   <S>                                           <C>      <C>       <C>
   Santa Fe:
    Developed..................................   105.0     220.5       141.8
    Undeveloped................................    24.0      32.1        29.3
                                                  -----     -----    --------
      Total....................................   129.0     252.6       171.1
                                                  =====     =====    ========
   Snyder:
    Developed..................................    16.1     297.5        65.7
    Undeveloped................................     0.7      65.7        11.6
                                                  -----     -----    --------
      Total....................................    16.8     363.2        77.3
                                                  =====     =====    ========
   Net Proved Reserves (Pro Forma Combined):
    Developed..................................   121.1     518.0       207.5
    Undeveloped................................    24.7      97.8        40.9
                                                  -----     -----    --------
      Total....................................   145.8     615.8       248.4
                                                  =====     =====    ========
   Reserve Valuation Information (in millions):
   Santa Fe:
    Estimated Future Net Cash Flows (before
     income taxes).............................                      $1,250.8
    Present Value of Future Net Cash Flows
     (before income taxes) discounted at 10%...                      $  759.7
    Standardized Measure of Discounted
     Future Net Cash Flows.....................                      $  579.7
   Snyder:
    Estimated Future Net Cash Flows (before
     income taxes).............................                      $  613.2
    Present Value of Future Net Cash Flows
     (before income taxes) discounted at 10%...                      $  375.3
    Standardized Measure of Discounted
     Future Net Cash Flows.....................                      $  291.8
</TABLE>
 
                                       12
<PAGE>
 
                           Comparative Per Share Data
                                  (Unaudited)
 
   The following table summarizes the per share information for Snyder and
Santa Fe on a historical, pro forma combined and equivalent basis. The pro
forma information gives effect to the merger accounted for by Santa Fe as a
purchase business combination and is adjusted to exclude the results
attributable to Monterey, in the case of Santa Fe, and Patina, in the case of
Snyder. You should read this information together with the historical financial
statements (and related notes) included in the annual reports on Form 10-K and
other information that each of Santa Fe and Snyder has filed with the
Securities and Exchange Commission. See "Where You Can Find More Information"
on page 80. You should not rely on the pro forma combined information as being
indicative of the results that would have been achieved had the companies been
combined or the future results that the combined company will experience after
the merger.
 
<TABLE>
<CAPTION>
                                                  Year Ended  Nine Months Ended
                                                 December 31,   September 30,
                                                     1997           1998
                                                 ------------ -----------------
<S>                                              <C>          <C>
Historical--Snyder:
  Earnings (loss) Per Share Before
   Extraordinary Item (1)
    Basic......................................     $0.82          $(0.37)
    Diluted....................................      0.81           (0.37)
  Book Value Per Share (2).....................      7.91            4.79
  Cash Dividends Per Common Share..............     $0.26          $ 0.195
Historical--Santa Fe:
  Earnings (loss) Per Share Before
   Extraordinary Item (1)
    Basic......................................     $0.24          $(0.17)
    Diluted....................................      0.24           (0.17)
  Book Value Per Share (2).....................      4.41            4.20
  Cash Dividends Per Common Share..............        --            --
Equivalent Pro Forma Combined Per Snyder Common
 Share (3):
  Earnings (loss) Per Share Before
   Extraordinary Item (1)
    Basic......................................     $0.33          $(0.61)
    Diluted....................................      0.33           (0.61)
  Book Value Per Share (2).....................                     10.13
  Cash Dividends Declared Per Common Share.....        --            --
Pro Forma Combined--Santa Fe Snyder:
  Earnings (loss) Per Share Before
   Extraordinary Item (1)
    Basic......................................     $0.16          $(0.30)
    Diluted....................................      0.16           (0.30)
  Book Value Per Share (2).....................                      4.94
  Cash Dividends Declared Per Common Share.....        --            --
</TABLE>
- --------
(1) This calculation uses the weighted average number of common shares
    outstanding, including common share equivalents, if dilutive.
(2) Computed by dividing stockholders' equity by the number of shares of common
    stock outstanding at the end of the period on a historical or pro forma
    combined basis.
(3) Amounts are calculated by multiplying the respective unaudited pro forma
    combined Santa Fe Snyder per share amounts by the exchange ratio of 2.05
    shares of Santa Fe common stock for each share of Snyder common stock.
 
                                       13
<PAGE>
 
                                  RISK FACTORS
 
   You should carefully consider the following risk factors in determining
whether to vote to approve the merger and the related merger agreement and, in
the case of Santa Fe stockholders, the issuance of the shares of Santa Fe
common stock in exchange for Snyder common stock and the election of the Snyder
nominees to the Santa Fe board of directors.
 
                      Risk Factors Relating to the Merger
 
Inherent Challenges in Combining Santa Fe and Snyder
 
   The merger involves the integration of two companies that have previously
operated independently. Santa Fe Snyder may encounter difficulties in
integrating the two companies' organizations and operations. Santa Fe Snyder
may experience operational interruptions or the loss of key employees,
customers or suppliers. The integration of the operations of Santa Fe and
Snyder will require substantial attention from the management of the combined
company. The diversion of management's attention and any difficulties
encountered in the transition and integration processes could have an adverse
effect on the revenues, levels of expenses and operating results of the
combined company. The combined company may not realize any of the anticipated
benefits of the merger, including the expected cost savings of approximately
$20 million per year.
 
Value of Santa Fe Stock to be Received in the Merger May Fluctuate
 
   The number of shares of Santa Fe common stock to be received in the merger
for each share of Snyder common stock is fixed. Therefore, because the market
price of Santa Fe common stock is subject to fluctuation, the value at the time
of the merger of the consideration to be received by the Snyder stockholders
will depend on the market price of Santa Fe common stock at that time. For
historical and current market prices of Santa Fe common stock, see "Comparative
Per Share Market Price and Dividend Information" on page 53.
 
Santa Fe Snyder's Business Will Be Affected By Different Factors
 
   The businesses of Santa Fe and Snyder are different. Santa Fe's production
and reserves are heavily weighted towards oil, while Snyder's are predominantly
gas. Santa Fe has substantial international exposure, while Snyder is wholly
domestic.
 
                 Risk Factors Relating to the Combined Company
 
Volatility of Oil and Natural Gas Prices May Affect Financial Results
 
   Even relatively modest changes in oil and natural gas prices may
significantly change Santa Fe Snyder's revenues, results of operations, cash
flows and proved reserves. Unlike Santa Fe which is more sensitive to changes
in oil prices and Snyder which is more sensitive to changes in natural gas
prices, since the combined company will have a relatively balanced production
of natural gas and oil (estimated to be 55% natural gas and 45% oil during
1999), a change in the price paid for either natural gas or oil production will
significantly affect our results of operations. Prices for oil and natural gas
reflect the supply and demand for such commodities and, with respect to oil,
the world political situation as it affects OPEC, the Middle East, the former
Soviet Union and other producing countries. The price of natural gas may be
affected by the price and availability of alternative sources of energy,
weather conditions, the level of natural gas in storage and other economic
factors. If the industry experiences significant prolonged future price
decreases, Santa Fe Snyder may be unable to
 
                                       14
<PAGE>
 
generate sufficient cash flow from operations to meet its obligations and make
planned capital expenditures. In order to reduce its exposure to risks in the
sale of its oil and natural gas, Santa Fe Snyder may from time to time enter
into price hedging or swap transactions covering a portion of its production
volumes.
 
Possible Writedowns of Properties' Carrying Values
 
   Accounting rules require that Santa Fe Snyder periodically review the
carrying value of its oil and gas properties for possible impairment. Based on
specific market factors and circumstances at the time of prospective impairment
reviews, and the continuing evaluation of development plans, production data,
economics and other factors, as appropriate, Santa Fe Snyder may be required to
write down the carrying value of its oil and gas properties. For example, at
year-end 1998, Santa Fe recorded an $87.8 million writedown of its oil and gas
properties. Such a writedown constitutes a charge to earnings which does not
impact Santa Fe Snyder's cash flow from operating activities. However, such a
writedown does impact the amount of Santa Fe Snyder's stockholders' equity. The
risk that Santa Fe Snyder will be required to write down the carrying value of
its oil and natural gas properties increases when oil and natural gas prices
are depressed.
 
   Also, the merger will be accounted for as a purchase under the provisions of
Accounting Principles Board Opinion No. 16. Since the SEC staff takes the
position that goodwill is not created in connection with acquisitions for
companies in the natural resources business, the purchase price will be
allocated to the estimated fair values of the acquired net assets of Snyder
with any valuation differences attributed to oil and gas properties. The effect
of such allocation is to write up the carrying value of Snyder's historical net
assets to reflect the fair value of the Santa Fe shares that Snyder's
stockholders receive in the merger. As a result of such allocation, Santa Fe
Snyder will incur a substantially higher depletion expense than either Santa Fe
or Snyder would incur independently. This increased level of depletion expense
will materially reduce Santa Fe Snyder's net income below that which would
prevail if the carrying value was at a lower level.
 
   Based on the closing price of Santa Fe stock on the date of the merger
agreement, management believes that the resulting purchase price allocation
could cause the carrying value of Snyder's historical assets to significantly
exceed future amounts realizable from the assets, creating the likelihood of a
material post-merger writedown of the assets in future periods unless commodity
prices increase above their current levels or other future developments
substantiate the recoverability of the new, higher carrying value of Snyder's
assets. The amount and timing of any writedowns will be determined in the
future by management in accordance with applicable accounting rules based upon
circumstances existing at the time of the review. For example, if after the
merger management's long-term outlook for future commodities prices is
reflective of current NYMEX gas prices of approximately $1.95 per Mcfe, an
impairment would be necessary to the carrying value of Santa Fe Snyder's oil
and gas properties. On such basis, impairments could range from approximately
$150 million to $250 million, on a pre-tax basis, pursuant to the provisions of
Financial Accounting Standard No. 121. Any future writedown would likely have a
material adverse effect on Santa Fe Snyder's net income in the period(s) taken,
but would not affect the company's cash flows.
 
International Operations May Be Subject to Additional Risks
 
   General. Unlike Snyder which operates only in the United States and offshore
in the Gulf of Mexico, Santa Fe has substantial international operations. Upon
the merger, Santa Fe Snyder will similarly have substantial international
operations. Santa Fe Snyder's foreign properties and operations may be
adversely affected by local political and economic developments, including,
among others:
 
  . the risk of war, revolution, border disputes, expropriation,
    renegotiation or modification of existing contracts, import, export and
    transportation regulations and tariffs;
 
  . taxation policies, including royalty and tax increases and retroactive
    tax claims; and
 
  . exchange controls, currency fluctuations and other uncertainties arising
    out of foreign government sovereignty over our international operations.
 
                                       15
<PAGE>
 
   In addition, in the event of a dispute arising from foreign operations,
Santa Fe Snyder may be subject to the exclusive jurisdiction of foreign courts
or may not be successful in subjecting foreign persons to the jurisdiction of
courts in the United States. Santa Fe Snyder may also be hindered or prevented
from enforcing its rights against a governmental agency because of the doctrine
of sovereign immunity.
 
   Indonesia. Approximately 20% of Santa Fe Snyder's estimated pro forma
combined year end 1998 reserves are located in Indonesia. The political,
economic and social stability of Indonesia could, therefore, have a material
impact on the operations and financial results of the company after the merger.
During the last two years, Indonesia and many other Asian countries experienced
significant devaluations in their currencies and hyper-inflation, which have
resulted in disruptions and uncertainties in financial markets, and political
and social instability. This resulted in the resignation in May 1998 of
Indonesia's President Suharto after 32 years in office. Although Indonesia has
a well-established history of honoring its contractual commitments and
concession terms, it is uncertain which political party will take control over
Indonesia's government in elections scheduled this summer or whether the new
government will seek reforms in, or take other actions with respect to,
governmental concessions and production sharing contracts.
 
   One effect of the currency devaluation has been to reduce certain operating
and administrative costs incurred by Santa Fe in its Indonesian operations,
thus reducing the number of equivalent barrels of oil that it retains in
reimbursement of costs and expenses incurred, and to reduce the value of
receivables and payables that are denominated in the local currency, the
rupiah. In addition, Santa Fe has experienced delays in collecting some
receivables. Santa Fe has experienced disruptions in the delivery of some
services and goods which has led to delays in certain operations and associated
production. Further political, economic and social instability in Indonesia
could have a material adverse effect on the operations and future financial
performance of Santa Fe Snyder.
 
Costs Related to Environmental and Other Governmental Regulations
 
   Environmental and other governmental regulations have increased the costs to
plan, design, drill, install, operate and abandon oil and natural gas wells and
other facilities of Santa Fe Snyder. Santa Fe and Snyder have expended
significant resources, both financial and managerial, to comply with
environmental regulations and permitting requirements. We anticipate that Santa
Fe Snyder will continue to do so in the future. It is possible that other
developments, such as increasingly strict environmental laws, regulations and
enforcement policies thereunder, and claims for damages to property, employees,
other persons and the environment resulting from our operations, could result
in substantial costs and liabilities in the future.
 
Estimates of Proved Reserves May Change
 
   The estimates of proved reserves of crude oil and natural gas included in
this document are based on various assumptions and are inherently speculative.
The accuracy of any reserve estimate is a function of the quality of available
data and engineering and geological interpretation and judgment and the
assumptions used regarding quantities of recoverable oil and natural gas
reserves and prices for crude oil, natural gas liquids and natural gas. Actual
prices, production, development expenditures, operating expenses and quantities
of recoverable oil and natural gas reserves will vary from those assumed in our
estimates, and such variances may be significant. Any significant variance from
the assumptions used could result in the actual quantity of Santa Fe Snyder's
reserves and future net cash flow being materially different from the estimates
in our reserve reports. In addition, results of drilling, testing and
production and changes in crude oil, natural gas liquids and natural gas prices
after the date of the estimate may result in substantial upward or downward
revisions.
 
Santa Fe Snyder Faces Strong Competition
 
   There is strong competition relating to all aspects of the oil and natural
gas industry, and in particular in the exploration and development of new oil
and natural gas reserves. Santa Fe Snyder must compete with a substantial
number of other oil and natural gas companies, many of which have greater
resources.
 
                                       16
<PAGE>
 
Santa Fe Snyder May Not Be Able to Replace Reserves
 
   Without successful exploration, development or acquisition activities, Santa
Fe Snyder's reserves and revenues will decline over time. Exploration, the
continuing development of reserves and acquisition activities will require
significant expenditures. If Santa Fe Snyder's cash flow from operations is not
sufficient for this purpose, we may not be able to obtain the necessary funds.
The inability to replace reserves could reduce the amount of credit available
to Santa Fe Snyder since the maximum amount of borrowing capacity available
under its revolving credit facility will be based, at least in part, on the
estimated quantities of its proved reserves.
 
Some Hazard Losses May Not Be Insured
 
   Santa Fe Snyder will carry insurance against some, but not all, of the
hazards associated with its business. This is standard practice for both Santa
Fe and Snyder and we believe this is standard practice in our industry. Because
of this practice, however, Santa Fe Snyder may be subject to liability or
losses that could be substantial due to events that are not insured.
 
Restrictions on Payment of Dividends
 
   The determination of the amount of future cash dividends, if any, to be
declared and paid is in the sole discretion of Santa Fe Snyder's board of
directors and will depend on the following factors:
 
  . Santa Fe Snyder's financial condition;
 
  . earnings and funds from operations;
 
  . the level of Santa Fe Snyder's capital and exploration expenditures;
 
  . dividend restrictions in Santa Fe Snyder's financing agreements;
 
  . Santa Fe Snyder's future business prospects; and
 
  . other matters that Santa Fe Snyder's board of directors deems relevant.
 
   Santa Fe Snyder's credit agreements limit the payment of dividends to the
holders of its capital stock, including the Santa Fe Snyder common stock.
 
                                       17
<PAGE>
 
                BUSINESS OF SANTA FE SNYDER FOLLOWING THE MERGER
 
   The combination of Santa Fe and Snyder is intended to create a larger, more
diversified, financially stronger and more cost efficient enterprise. On a pro
forma combined basis, Santa Fe Snyder will have estimated proved reserves of
315 million barrels of oil equivalent at year end 1998 and estimated production
of 110,000 BOEPD in 1999 (55% gas and 70% domestic). The larger size and scale
of the combined company is intended to allow Santa Fe Snyder to capitalize on a
wider range of opportunities and to develop and operate larger exploration and
development projects than either Santa Fe or Snyder alone. Management also
believes that this larger size will allow Santa Fe Snyder to operate more
competitively in the current low commodity price environment and to make
opportunistic acquisitions too large for either Santa Fe or Snyder alone.
 
   Santa Fe Snyder's asset base will be comprised of both domestic and
international assets. Combined, Santa Fe and Snyder will have interests in the
Permian basin of West Texas and Southeast New Mexico, the Gulf of Mexico, the
Rocky Mountains, northern Louisiana, Indonesia, Argentina, Gabon, China,
Brazil, Cote d'Ivoire, Malaysia and Ghana. Santa Fe and Snyder believe that the
stable cash flow generated from their existing North American production will
allow Santa Fe Snyder to continue to fund and develop their combined portfolio
of domestic and international exploration and development projects.
 
   Santa Fe and Snyder are developing plans to integrate their operations
immediately after the merger to take full advantage of the benefits that the
merger will create. Those benefits include increased financial strength and
flexibility, more efficient allocation of capital, a balanced asset base,
substantial cost savings and an increased ability to pursue acquisitions.
 
   Increased Financial Strength and Flexibility. Santa Fe Snyder's larger
capitalization should enhance its access to capital to explore and exploit the
prospects and projects available to the combined company. Pro forma for the
merger, Santa Fe Snyder would have had EBITDAX of approximately $220.0 million
for the year ended December 31, 1998 and a long-term debt-to-book
capitalization ratio of approximately 40% as of December 31, 1998. Santa Fe
Snyder's increased size should make available additional forms of cost
effective financing to allow Santa Fe Snyder to manage capital costs and to
pursue further growth opportunities.
 
   More Efficient Allocation of Capital. The combination will also allow Santa
Fe Snyder the opportunity to select the best opportunities contained in the two
companies' combined exploration project inventories and to focus on those
exploitation projects with the highest predicted rates of return. As a result,
Santa Fe Snyder plans to enhance its expected return on investment by
allocating capital more efficiently than either Snyder or Santa Fe alone. Santa
Fe Snyder's increased geographic diversity will additionally enable the company
to match domestic and international cash flow requirements and sources,
minimizing repatriation and tax issues and facilitating improved cash
management efficiency.
 
   Balanced Asset Base. Santa Fe Snyder's reserves will be diversified
geographically, with approximately 65% of its estimated pro forma combined year
end 1998 proved reserves being domestic and 35% international. The companies
believe that the balance between domestic and international properties will
lower the overall risk profile of current production by further diversifying
the revenue and cash flow sources for Santa Fe Snyder. In addition, the
combined companies' balance of oil and natural gas investment opportunities
will allow Santa Fe Snyder to adjust its capital program in response to
relative changes in commodity prices.
 
   Cost Savings. After the merger Santa Fe Snyder will be reorganized,
including the consolidation of the two companies' corporate offices and Gulf of
Mexico operations. Santa Fe and Snyder believe that this operational and
organizational consolidation will allow for substantial overhead cost savings
through the consolidation of duplicative corporate and field offices and staff.
Santa Fe and Snyder estimate that they will realize approximately $20 million
of annualized cost savings as a result of the merger. Based on these cost
savings, the merger is expected to be accretive on a cash flow basis to Santa
Fe and Snyder stockholders in 1999.
 
                                       18
<PAGE>
 
   Santa Fe Snyder intends to aggressively work toward reducing total per
barrel costs in order to achieve higher operating margins. In addition to the
approximately $20 million of anticipated cost savings, the effort will involve
focusing on production growth, reducing lease operating expense and interest
expense and ongoing asset portfolio rationalization aimed at selling lower
growth and/or higher cost properties. These steps are intended to better
position Santa Fe Snyder to operate more competitively in a low commodity price
environment and to achieve greater cash flow and reinvestment benefits in
higher price environments.
 
   Increased Ability to Pursue Acquisitions. The combination of Santa Fe and
Snyder is expected to position Santa Fe Snyder to participate in further
consolidation among independent exploration and production companies. Santa Fe
Snyder's strategy in the current commodity market will include actively
pursuing domestic and international acquisition opportunities that enhance its
reserve and production base or allow for further cost savings. Santa Fe and
Snyder believe that Santa Fe Snyder's enhanced financial position and stature
in the industry will allow it to pursue acquisitions on a more effective basis
than either of the companies could have on an individual basis.
 
                                       19
<PAGE>
 
                                   THE MERGER
 
General
 
   The merger agreement provides that following the satisfaction or waiver of
the conditions contained in the merger agreement, Snyder will be merged into
Santa Fe. The common stock to be issued to Snyder common stockholders in the
merger and the common stock to remain outstanding with Santa Fe stockholders
following the merger is referred to herein as Santa Fe common stock. The
combined company is referred to herein as Santa Fe Snyder.
 
Consideration
 
   Upon consummation of the merger each share of Snyder common stock issued and
outstanding immediately prior to the effective time will be converted into 2.05
shares of Santa Fe common stock. In addition, each outstanding option of Snyder
to purchase shares of Snyder common stock will be canceled at the effective
time of the merger and, except for holders receiving severance packages, Santa
Fe Snyder will grant the holder of such former Snyder option an option to
purchase common stock of Santa Fe Snyder on substantially the same terms,
except that the number of shares subject to such new option will be 2.05 times
the number of shares subject to the Snyder option and the exercise price will
be the former exercise price divided by 2.05.
 
Amendments to Santa Fe's Certificate of Incorporation
 
   The merger agreement provides that upon the effective time of the merger,
Santa Fe's certificate of incorporation will be amended to
 
  . increase the number of authorized shares of Santa Fe common stock from
    200,000,000 to 300,000,000, and
 
  . change the name of Santa Fe to "Santa Fe Snyder Corporation."
 
These amendments will occur automatically if the merger is completed and will
not be effected if the merger is not completed. Further, promptly after such
effective time, Santa Fe Snyder's board of directors will amend the certificate
of designations for Santa Fe's Series A Junior Participating Preferred Stock to
increase to 3,000,000 the number of shares of preferred stock subject to such
designation.
 
Election of New Directors and Appointment of Executive Management
 
   The merger agreement provides for the Santa Fe board to be increased to 11
members, five of whom will be designated for nomination by the Snyder board. In
addition, the merger agreement designates the persons who are to serve as the
executive officers of Santa Fe Snyder beginning immediately after the merger.
See "Directors and Officers of Santa Fe Snyder Following the Merger" on page
69.
 
Ownership of Santa Fe Snyder Following the Merger
 
   The shares of Santa Fe common stock to be issued to holders of Snyder common
stock in the merger will constitute approximately 40% of all of the issued and
outstanding Santa Fe common stock immediately after the merger. The existing
stockholders of Santa Fe will hold approximately 60% of all of the issued and
outstanding Santa Fe common stock immediately after the merger.
 
Background of the Merger
 
   General--Snyder. In March 1997, Snyder engaged the investment banking firm
of Petrie Parkman & Co., Inc. to assist Snyder in developing an acquisition
strategy directed toward public corporations and in conducting a review of
numerous corporate acquisition candidates within its industry. Through this
effort, Snyder hoped to identify one or more peer companies with complementary
assets which could be acquired for a
 
                                       20
<PAGE>
 
rational price. During the first quarter of 1998, Snyder held exploratory
meetings with numerous companies to discuss the feasibility of a merger with or
sale to Snyder, including a meeting with Santa Fe in March 1998. These meetings
involved no exchange of data, no discussion of fundamental issues, such as
value or structure, and none of the meetings resulted in Snyder making or
receiving any formal proposal. Throughout this period, Snyder remained open to
preliminary discussions about its willingness to be acquired. None of these
meetings resulted in discussions implicating a range of values comparable to
those Snyder believed to be attainable through the continued execution of its
long-term strategic plan involving independent internal and acquisitive growth,
and Snyder received no formal acquisition proposals.
 
   To complement Snyder's exploration of acquisition transactions, Snyder also
explored the possibility of engaging in a "merger of equals" transaction with a
company that possessed complementary asset holdings, in terms of quality,
nature and location, and with a compatible or complementary strategy,
capitalization, management and culture. During the second and third quarters of
1998, Snyder had exploratory meetings with a number of exploration and
production companies to discuss the merits of a strategic combination through a
merger or joint venture, without a significant premium being paid by either
party, and where the stockholders of the constituent corporations would retain
their proportionate ownership in the resulting entity. Generally, the companies
with which Snyder met failed one or more of Snyder's strategic criteria
relating to financial strength, operational focus, executive leadership or
strategic direction. As a result, none of these meetings resulted in Snyder
making or receiving any formal proposal.
 
   General--Santa Fe. From time to time during the prior two years, members of
Santa Fe's board of directors and senior management have internally reviewed
and evaluated merger, acquisition and other combination opportunities in the
oil and gas exploration and production industry. At times during this period,
Santa Fe engaged investment banking firms, including DLJ and Chase, to assist
it in evaluating certain of these opportunities. Exploratory and, in some
cases, more extensive discussions were held by Santa Fe with numerous publicly
traded and private domestic and international companies over such two-year
period (including the referenced meeting with Snyder in March 1998), which
discussions included strategic combinations, mergers, acquisitions, joint
ventures and other combination structures with larger and smaller independent
oil and gas companies. None of these discussions resulted in a proposal that
was determined by Santa Fe's board of directors or management to be in the best
interests of Santa Fe and its stockholders.
 
   Recent Discussions and Due Diligence Evaluations Leading to Combination
Proposal. On December 3, 1998, Petrie Parkman contacted James L. Payne, chief
executive officer of Santa Fe, regarding Mr. Payne's interest in meeting with
John C. Snyder, chief executive officer of Snyder, to discuss the possibility
of Santa Fe and Snyder collaborating on acquiring additional oil and gas
assets. On December 9, 1998, Mr. Snyder, accompanied by a representative of
Petrie Parkman, met with Mr. Payne to discuss a potential joint acquisition
strategy relating to an acquisition candidate previously identified by Mr.
Snyder. During the course of the meeting, each of Mr. Snyder and Mr. Payne
briefly summarized their respective operations, management and organization. As
the meeting evolved, the conversation digressed from the joint acquisition
opportunity to the merits of a strategic combination of Snyder and Santa Fe,
and the men discussed the two companies' complementary asset bases, strong
balance sheets and similar growth strategies. In addition, other acquisition
candidates of mutual interest were discussed. At the conclusion of the meeting,
the two men agreed to reflect on the idea of a merger for a few days. On
December 11, 1998, the two chief executives agreed to meet on December 14, 1998
to continue discussion regarding the merits of a strategic combination of the
two companies.
 
   On December 13, 1998, Santa Fe requested that DLJ and Chase assist Santa Fe
in evaluating a possible strategic combination with Snyder.
 
   On December 14, 1998, Mr. Snyder, Mark A. Jackson, Chief Financial Officer
of Snyder, Mr. Payne, Janet F. Clark, Chief Financial Officer of Santa Fe,
representatives of Petrie Parkman and representatives of DLJ met primarily to
discuss the merits of a strategic combination between Snyder and Santa Fe. At
this
 
                                       21
<PAGE>
 
meeting, the two chief executive officers discussed the potential social issues
attendant in any strategic combination of the companies, including
organizational issues and issues relating to relocating one of the companies'
headquarters. They also discussed in very preliminary terms the basis for
determining an appropriate exchange ratio in any strategic combination of the
companies. In this regard, they agreed that it should generally reflect the
ratio of the two companies' trading prices, but did not agree over what period
of time the prices should be compared. Mr. Snyder urged that the ratio should
reflect the two companies' current relative trading prices, yielding an
exchange ratio between 2.1 and 2.2 Santa Fe shares to each share of Snyder. Mr.
Payne took the position that the ratio should be consistent with the companies'
relative trading prices over the preceding three months, resulting in a ratio
of approximately 1.9 Santa Fe shares to each share of Snyder. The two men
agreed to defer further discussion of the exchange ratio to a later date
pending further review of the merits of the combination. They also discussed
the feasibility of independently financing a sizable joint acquisition.
 
   On December 22, 1998, Messrs. Payne and Snyder and their respective senior
management, financial advisors and counsel met at Santa Fe's offices to discuss
organizational, financial and structural issues with respect to a possible
strategic combination, the relative strengths of the two companies, the
advantages of a combined entity and various due diligence matters. During this
day-long meeting, each company made a lengthy presentation on its operations,
organization, financial position and growth strategy. The purpose of this
meeting was to enable the management of each company to thoroughly understand
the other company, to evaluate the merits of combining the companies through a
merger, and to identify integration issues and cost savings opportunities. At
the conclusion of the meeting, management of both companies agreed to meet the
following day to continue exploring the merits of a strategic combination.
 
   On December 23, 1998, the senior management of both companies and their
financial advisors met at the offices of Petrie Parkman for further discussions
regarding the proposed strategic combination. During this meeting, Mr. Snyder
and Mr. Payne agreed that the apparent merits of a strategic combination
between the two companies warranted focusing the companies' efforts towards the
combination discussions as a higher priority than any further pursuit of
potential joint acquisition strategies at that time, and that discussion of
future acquisitions could be postponed until a later date. Both men agreed on a
process and schedule for performing operational, financial and legal reviews of
each other as a condition for continued combination discussions. Mr. Snyder and
Mr. Payne instructed their respective management teams to begin negotiating
draft merger documentation based upon a stock-for-stock merger with a fixed
exchange ratio to be determined, subject to the companies' agreement on
material terms and approval by their respective boards of directors. Prior to
adjourning the meeting, the two men and their financial advisors engaged in an
active discussion concerning an appropriate exchange ratio to apply in any
strategic combination between the companies. The two men tentatively chose the
ratio of 2.05-to-1 and agreed to consider this ratio over the next several days
in light of any changes in either company's stock price.
 
   Negotiation of Definitive Agreement. During the period from December 24,
1998 to January 11, 1999, Santa Fe's outside counsel prepared drafts of the
merger agreement and delivered it to Snyder's outside counsel. Each party
provided several rounds of comments and Santa Fe's counsel prepared and
delivered several revised drafts. Various issues remained unresolved, including
the amount of the termination fee and the circumstances under which the
termination fee would be payable, board composition and executive management of
the combined company, as well as conditions to closing of the merger. During
the same period, representatives of the two companies, including their
respective financial advisers, counsel and accountants, held numerous due
diligence meetings covering properties and prospects, engineering, financial,
legal, tax and accounting matters and held additional meetings to complete
their respective factual investigations, to resolve open issues and to finalize
the documentation relating to the merger.
 
   On January 8, 1999, Messrs. Snyder and Payne met to discuss details of the
potential strategic combination as well as issues raised as a result of the
companies' operational and financial reviews. During this meeting, both men
confirmed that they would recommend to their respective boards of directors an
exchange ratio of 2.05 Santa Fe shares to each Snyder share, provided that the
relative trading values did not change substantially during the following days.
 
                                       22
<PAGE>
 
   Review and Approval by Snyder's and Santa Fe's Board of Directors. On
January 11, 1999, Snyder's board of directors met to receive a report on the
status of the strategic combination with Santa Fe. During the weeks preceding
the meeting, Mr. Snyder discussed the merits of the proposed strategic
combination with each member of the Snyder board, provided them with
substantial financial and operational information relating to Santa Fe, and
kept them apprised of developments in the discussions. At this meeting, the
board received a memorandum outlining the due diligence process and certain due
diligence matters, and reviewed certain pro forma financial information
prepared giving effect to the combination. The board was provided copies of the
draft merger agreement, which was subject to on-going negotiation, and was
briefed on its salient terms. The board received a thorough report from
representatives of Petrie Parkman regarding its valuation of Snyder and Santa
Fe and certain analyses of a combined entity. See "--Opinions of Financial
Advisors--Snyder's Financial Advisor." Petrie Parkman advised the Snyder board
that it was prepared to deliver an opinion as to the fairness of the exchange
ratio to Snyder's stockholders from a financial point of view, assuming the
final exchange ratio was consistent with levels discussed during the meeting.
After extensive discussion, the board directed management to continue the
discussions with Santa Fe and scheduled a meeting for January 13 in order to
allow time for the members to reflect on the information provided.
 
   On January 12, 1999, the Santa Fe board held a special meeting at which all
members were present. At various times during the three-week period prior to
such meeting, Mr. Payne had orally discussed the merits of the proposed
strategic combination with each member of Santa Fe's board of directors,
provided them with financial and operational information relating to Snyder and
kept them apprised of developments in the discussions. At this meeting, members
of the Santa Fe board were provided with reports prepared by Chase and DLJ that
included the analyses supporting DLJ's and Chase's opinions to the Santa Fe
board of directors as summarized under "--Opinions of Financial Advisors--Santa
Fe's Financial Advisors." Senior management also presented a detailed
discussion regarding financial and operational results and the terms and
structure of the proposed merger and related transactions. Both Chase and DLJ
made a presentation regarding the proposed merger, the strategic benefits to
Santa Fe and its stockholders of a combination with Snyder and the financial
attributes of the combined company and advised the board that they were
prepared to deliver opinions as to the fairness of the exchange ratio to Santa
Fe's stockholders from a financial point of view, assuming the final exchange
ratio was consistent with levels discussed during the meeting. The Santa Fe
board discussed the advantages and benefits of a strategic combination of the
two companies. The Santa Fe board then directed management to continue to
pursue a combination with Snyder and to finalize the merger agreement and
scheduled a meeting for January 13 to resume consideration of the combination
with Snyder after the board members had reflected on the information provided
at the meeting.
 
   On January 13, 1999, Snyder's board of directors held a telephonic meeting
to receive a report on the status of the transaction and to consider the
proposed strategic combination with Santa Fe. As a preliminary matter, the
board was updated on certain due diligence matters and changes negotiated to
the draft merger agreement since the January 11 meeting. A representative of
Petrie Parkman then delivered the firm's oral opinion (which was subsequently
confirmed in writing as of January 13, 1999) to the effect that, as of the date
thereof and subject to the matters set forth therein, an exchange ratio of 2.05
shares of Santa Fe common stock per share of Snyder common stock was fair to
the stockholders of Snyder from a financial point of view. The board of Snyder
then voted and unanimously approved the merger, the terms of the merger
agreement and the transactions contemplated thereby, agreed to call the Snyder
special meeting and recommended that all Snyder stockholders vote their shares
"for" approval of the merger agreement and the other matters contemplated
thereby. In addition, each board member expressed his intention to vote his
personal holdings in Snyder stock "for" approval and adoption of the merger and
the merger agreement.
 
   On January 13, 1999, the Santa Fe board held a telephonic special meeting to
discuss the strategic combination with Snyder. At this meeting, Santa Fe's
senior management advised Santa Fe's board of directors that the negotiations
on the merger agreement were finalized. Management advised Santa Fe's board of
 
                                       23
<PAGE>
 
directors that it recommended an exchange ratio of 2.05 shares of Santa Fe
common stock for each outstanding share of Snyder common stock. Management
further advised the Santa Fe board of directors that they continued to believe
that the benefits of a strategic combination with Snyder identified during the
previous meeting could be achieved. Further, each of DLJ and Chase delivered
its oral opinion to the Santa Fe board (subsequently confirmed in writing as of
January 13, 1999) to the effect that as of such date and based upon and subject
to certain matters stated therein, such exchange ratio is fair to Santa Fe's
stockholders from a financial point of view. After such presentations and a
discussion and consideration of the factors described under "--Reasons for the
Merger--Santa Fe," the Santa Fe board unanimously approved the proposed
strategic combination and authorized the Santa Fe officers to execute the
merger agreement and related documents using an exchange ratio of 2.05 shares
of Santa Fe for each outstanding Snyder share, the issuance of Santa Fe common
stock in connection therewith and the other transactions contemplated thereby,
agreed to call the Santa Fe special meeting and recommended that all Santa Fe
stockholders vote their shares "for" approval of the merger agreement, the
issuance of Santa Fe common stock and the other matters contemplated thereby.
In addition, each board member expressed an intention to vote his or her shares
of Santa Fe stock "for" approval and adoption of the merger and the merger
agreement, including the issuance of shares of Santa Fe common stock in the
merger and the election of the five Snyder nominees to the board of Santa Fe
Snyder.
 
   Execution of Definitive Agreement and Public Announcement. Following the
January 13, 1999 special meetings of the Santa Fe and Snyder boards of
directors, Santa Fe and Snyder executed the merger agreement. On the same day,
the parties publicly announced in a joint press release that they had entered
into the merger agreement.
 
Reasons for the Merger--Santa Fe
 
   At its meeting held on January 13, 1999, the Santa Fe board of directors by
unanimous vote of the members of such board (all of whom were present and
acting throughout such meeting) approved the merger, the merger agreement and
the transactions contemplated thereby, and recommended that the Santa Fe
stockholders approve and adopt same. The Santa Fe board of directors believes
that the merger agreement and the terms of the merger are fair to, and in the
best interests of, Santa Fe and the Santa Fe stockholders and recommends that
the stockholders of Santa Fe vote for adoption of the merger agreement and the
transactions contemplated thereby. The Santa Fe board also recommends that the
stockholders of Santa Fe vote for the election of each of the five Snyder
nominees to the Santa Fe Snyder board of directors.
 
   In reaching its determination, the Santa Fe board of directors consulted
with Santa Fe's management, as well as its financial and legal advisors, and
considered the following material factors:
 
  . that the merger would increase the percentage of Santa Fe's gas
    production from approximately 42% on a stand-alone basis to approximately
    55% on a pro forma combined company basis, reducing Santa Fe's exposure
    to oil price changes and providing a more balanced ratio of gas to oil
    reserves;
 
  . that the combined company will have a much improved balance of domestic
    to international reserves, with approximately 65% of Santa Fe Snyder's
    proved reserves located in North America and the remaining 35% located
    internationally;
 
  . that Santa Fe Snyder would be a larger company with an improved balance
    sheet, debt and cash flow levels consistent with investment grade
    companies and greater financial flexibility and access to capital than
    Santa Fe alone, which Santa Fe management believes will result in
    improved liquidity and lower cost of funding than Santa Fe had alone, and
    an improved ability to withstand the current low pricing environment, to
    grow reserves through exploration and development using internally
    generated funds, and to be an active participant in continued industry
    consolidation;
 
  . the opportunity to realize approximately $20 million in annualized cost
    savings through the merger, including the consolidation of the corporate
    headquarters of the two companies and the elimination of duplicative
    staff and expenses;
 
                                       24
<PAGE>
 
  . the fact that the merger is expected to be accretive on a cash flow basis
    to the Santa Fe stockholders in 1999 and 2000, taking into effect the
    cost savings referred to above;
 
  . the ability to optimize capital allocations among an increased number of
    projects and enhanced flexibility to allocate capital among gas or oil
    projects and domestic or international projects as the combined company
    determines appropriate under the circumstances;
 
  . the ability to enhance Santa Fe's Gulf of Mexico operations by allocating
    capital and personnel to those projects of the combined company with the
    highest return at acceptable risk levels;
 
  . the structure of the merger, in which Santa Fe will be the surviving
    corporation in a tax-free merger and, immediately after the merger, its
    stockholders will own approximately 60% of Santa Fe Snyder's outstanding
    common stock;
 
  . the continued involvement in the management of the combined company of
    key members of Santa Fe management, including James L. Payne as Chief
    Executive Officer, Hugh L. Boyt as President--International, Janet F.
    Clark as Executive Vice President--Corporate Development and
    Administration, Duane C. Radtke as Executive Vice President--Production
    and Tim S. Parker as Executive Vice President--Exploration, and key
    members of Snyder's management, including John C. Snyder as Chairman of
    the Board, William G. Hargett as President--North America and Mark A.
    Jackson as Executive Vice President and Chief Financial Officer, and that
    members of Santa Fe's board of directors would constitute a majority of
    the members of the Santa Fe Snyder board of directors;
 
  . the opinions of Chase and DLJ to the Santa Fe board of directors to the
    effect that as of such date and based upon and subject to certain matters
    stated therein, the exchange ratio was fair to the Santa Fe stockholders
    from a financial point of view; and
 
  . the strategic combination with Snyder will not foreclose the Santa Fe
    stockholders from the opportunity to receive a premium for their shares
    in any "change of control" transaction that may be proposed with respect
    to the combined company in the future.
 
   In reaching the determination that the merger, the merger agreement and the
transactions contemplated thereby are advisable and fair to and in the best
interests of Santa Fe and its stockholders, the Santa Fe board of directors
also considered a number of additional factors, including its discussions with
Santa Fe's management concerning the results of Santa Fe's investigation of
Snyder, the strategic, operational and financial opportunities available to
Santa Fe in the normal course of its business compared to those that might be
available following the merger, the historical and current market prices of
Santa Fe common stock and Snyder common stock and the proposed structure of the
transaction and the other terms of the merger agreement and related agreements.
 
   The Santa Fe board of directors also considered certain risks and potential
disadvantages associated with the merger, including the risk that the
operations of the two companies may not be successfully integrated, the risk
that anticipated cost savings may not be realized to the degree anticipated,
the risk that the business combination might not be completed as a result of a
failure to satisfy the conditions to the merger agreement and other matters
described under "Risk Factors" on pages 14-17. In the judgment of the Santa Fe
board of directors, the potential benefits of the merger outweigh these
considerations.
 
   The foregoing discussion of the information and factors that were given
weight by the Santa Fe board of directors is not intended to be exhaustive, but
it is believed to include all material factors considered by the Santa Fe board
of directors. In view of the variety of factors considered in connection with
its evaluation of the proposed merger and the terms of the merger agreement,
the Santa Fe board of directors did not deem it practical to, and did not,
quantify or otherwise assign relative weights to the specific factors
considered in reaching its conclusion, and individual directors may have given
different weights to different factors.
 
   After considering all such factors, at its meeting held on January 13, 1999
the Santa Fe board of directors by the unanimous vote of all of its members
(each of which was present at the meeting and acting throughout)
 
                                       25
<PAGE>
 
approved the merger, the merger agreement, including the issuance of shares of
Santa Fe common stock in the merger, and the other transactions contemplated
thereby.
 
   The Santa Fe board of directors has by the unanimous vote of all of its
members approved the merger agreement. The Santa Fe board of directors
recommends that the stockholders of Santa Fe vote "for" approval and adoption
of the merger agreement and the transactions contemplated thereby.
 
   In considering the recommendation of the Santa Fe board of directors with
respect to the merger, the merger agreement, including the issuance of shares
of Santa Fe common stock in the merger, and the other transactions contemplated
thereby, Santa Fe stockholders should be aware that certain officers and
directors of Santa Fe have interests in the proposed merger that are different
from and in addition to the interests of Santa Fe stockholders generally. The
Santa Fe board of directors was aware of these conflicts of interest and
considered them in approving the merger and merger agreement. For a description
of such interests, see "Interests of Certain Directors and Officers in the
Merger" that begins on page 54 of this document.
 
Reasons for the Merger--Snyder
 
   The Snyder board of directors has determined that the merger is fair to, and
in the best interest of, Snyder and its stockholders. Accordingly, the Snyder
board has unanimously approved the merger and recommends that the Snyder
stockholders vote "for" approval and adoption of the merger and the merger
agreement.
 
   The merger is intended to achieve several important financial, operational
and organizational objectives designed to:
 
  . ensure Snyder's continued strong financial position, enabling the company
    to continue to grow its reserves through internal drilling and through
    acquisitions despite the prospect for continued depressed commodity
    prices;
 
  . diversify Snyder's reserves and production, both geographically and as to
    the mix of oil and gas;
 
  . expose Snyder's stockholders to additional opportunities to participate
    in long-term reserve and production growth, with a mix of exploitation
    opportunities and high impact exploratory plays;
 
  . enhance Snyder's competitive position, both in the short term, in light
    of prevailing low product prices, and over the long term if prices
    improve;
 
  . position Snyder stockholders to benefit from larger, high-impact
    acquisition opportunities than Snyder could prudently pursue alone; and
 
  . improve stockholder liquidity and Snyder's appeal to large institutional
    investors.
 
   The principal reasons for the merger considered by Snyder's board of
directors are as follows:
 
  . The merger is intended to result in a combined company with a more robust
    financial structure, enjoying greater access to capital, lower cost of
    capital, increased flexibility in capital allocation and added resilience
    against fluctuations in commodity prices.
 
  . The merger is intended to result in a combined company with greater
    discretionary cash flow and debt capacity than either Snyder or Santa Fe
    alone. This will increase the combined company's ability to grow reserves
    through exploration and development using internally generated funds and
    will position the resulting company to more aggressively pursue large,
    high impact domestic and international transactions without excessive
    risk to the company's balance sheet.
 
  . The merger will result in a combined company with a very competitive cost
    structure, able to compete more effectively over the long term given the
    pessimistic outlook for commodity prices and the
 
                                       26
<PAGE>
 
    increasing trend toward consolidation in the exploration and production
    industry. The merger is expected to yield an annualized cost savings of
    approximately $20 million.
 
  . Operationally, the merger is intended to result in a combined company
    having a well balanced asset and cash flow base with significant
    predictable internal production growth and numerous high impact
    exploration opportunities. The combined company's estimated 1999
    production will consist of 55% gas and 45% oil, mitigating Snyder's
    vulnerability to regional pricing disparities while exposing Snyder's
    stockholders to significant upside potential in any oil price recovery.
    Combining Snyder and Santa Fe's Gulf of Mexico assets should allow the
    combined companies to achieve a critical mass in the Gulf, creating
    increased operational efficiencies and lower general and administrative
    costs. Combining the two companies should also result in a much larger,
    more diverse inventory of exploration and exploitation projects,
    facilitating more effective management of the combined company's risk
    profile. The combined company will possess a breadth of lower risk
    exploration and development opportunities in the Rocky Mountains, Permian
    Basin, Gulf of Mexico, Brazil and Argentina, against which to offset the
    risk associated with higher impact exploratory plays in Indonesia, West
    Africa, China and North Louisiana.
 
  . Organizationally, the merger will result in a combined company whose
    personnel will be chosen from a substantially larger executive and
    technical talent pool than is available to Snyder alone. By combining the
    two companies through the merger, Snyder stockholders will additionally
    benefit from Santa Fe's international managerial infrastructure.
 
  . The merger is intended to result in a combined company whose common stock
    will trade on the New York Stock Exchange (the "NYSE") in substantially
    greater dollar volumes than that of Snyder alone, providing greater
    liquidity for Snyder stockholders and for new institutional investors.
 
  . The ratio at which shares of Snyder common stock will be exchanged for
    shares of Santa Fe common stock in the merger was determined to be fair
    to holders of Snyder common stock from a financial point of view by
    management and Snyder's financial advisor, Petrie Parkman.
 
  . The merger will not foreclose the Snyder stockholders' opportunity to
    receive a premium for their shares in any "change of control" transaction
    that may be proposed with respect to the combined company in the future.
 
   In reaching its determination with respect to the merger, the Snyder board
considered a number of factors, including the reasons for the merger set forth
above and the matters described under "Risk Factors" on pages 14-17. In view of
the numerous factors taken into consideration, the Snyder board did not
consider it practical to, and did not attempt to, quantify or assign relative
weights to the factors considered by it in reaching its decision.
 
   In considering the recommendations of the Snyder board with respect to the
merger, the merger agreement and the transactions contemplated thereby, Snyder
stockholders should be aware that certain officers and directors of Snyder have
interests in the proposed merger that are different from and in addition to the
interests of Snyder stockholders generally. The Snyder board was aware of these
conflicts of interests and considered them in approving the merger and merger
agreement. See "Interests of Certain Directors and Officers in the Merger" that
begins on page 54 of this document.
 
Opinions of Financial Advisors
 
   Santa Fe's Financial Advisors.
 
   Santa Fe engaged Chase and DLJ as its financial advisors based on Chase's
and DLJ's experience and expertise. Chase and DLJ are internationally
recognized investment banking firms that have substantial experience in
transactions similar to the merger. The Santa Fe financial advisors, as part of
their investment banking businesses, are continuously engaged in the valuation
of businesses and securities in connection with mergers and acquisitions,
negotiated underwritings, competitive biddings, secondary distributions of
listed and unlisted securities, private placements and valuations for corporate
and other purposes.
 
                                       27
<PAGE>
 
   At the January 13, 1999 meeting of the Santa Fe board of directors, Chase
and DLJ delivered their oral opinions (subsequently confirmed separately by
each in writing, with such separate opinions hereafter referred to as the
"Chase opinion" and the "DLJ opinion," respectively, and, together, as the
"Santa Fe financial advisors opinions") to the effect that, as of the date
thereof, and subject to certain matters set forth therein, the exchange ratio
of 2.05 shares of Santa Fe common stock for each share of Snyder common stock
was fair to the stockholders of Santa Fe from a financial point of view.
 
   The full text of the Chase opinion, which sets forth the assumptions made,
matters considered and qualifications and limitations on the review undertaken
by Chase, is attached as Annex C to this document, and is incorporated herein
by reference. The full text of the DLJ opinion, which sets forth the
assumptions made, matters considered and qualifications and limitations on the
review undertaken by DLJ, is attached as Annex B to this document, and is
incorporated herein by reference. The summary of the Santa Fe financial
advisors opinions set forth in this document, which sets forth all of the
material provisions of such fairness opinions, is qualified in its entirety by
reference to the full text of the Chase opinion and of the DLJ opinion, as
applicable. Santa Fe stockholders are urged to read carefully each of the Santa
Fe financial advisors opinions in their entirety. The Santa Fe financial
advisors opinions were provided to the Santa Fe board for its information and
are directed only to the fairness, from a financial point of view, of the
exchange ratio to the stockholders of Santa Fe. The Santa Fe financial advisors
opinions did not constitute a recommendation to the Santa Fe board in
connection with the merger, do not address the merits of the underlying
decision by Santa Fe to engage in the merger or the price or range of prices at
which shares of Santa Fe common stock may trade subsequent to the announcement
or consummation of the merger. The Santa Fe financial advisors opinions also do
not constitute a recommendation to any Santa Fe stockholder as to how such
stockholder should vote on the Santa Fe proposal, or any matter related
thereto.
 
   Although the Santa Fe financial advisors each evaluated the fairness, from a
financial point of view, of the exchange ratio of 2.05 shares of Santa Fe
common stock for each share of Snyder common stock to the Santa Fe
stockholders, the exchange ratio of 2.05 shares of Santa Fe common stock for
each share of Snyder stock itself was determined by Santa Fe and Snyder through
arm's-length negotiations. The Santa Fe financial advisors provided advice to
Santa Fe during the course of such negotiations. Santa Fe did not provide
specific instructions to, or place any limitation on, the Santa Fe financial
advisors with respect to the procedures to be followed or factors to be
considered by the Santa Fe financial advisors in performing their analyses or
providing the Santa Fe Financial Advisors Opinions. The Santa Fe financial
advisors were not requested to, and did not, solicit offers from third parties
to acquire all or part of Santa Fe.
 
Chase Opinion
 
   In connection with the Chase opinion, Chase:
 
  . reviewed the merger agreement;
 
  . reviewed certain publicly available business and financial information
    that Chase deemed relevant relating to Santa Fe and Snyder and the
    industry in which they operate;
 
  . reviewed certain internal non-public financial and operating data
    provided to it by or on behalf of the managements of Snyder and Santa Fe
    relating to such businesses, including certain information as to the
    future financial results of such businesses, as well as the amount and
    timing of the cost savings and related expenses and synergies expected to
    result from the merger (the "Expected Synergies");
 
  . discussed with members of the senior management and representatives of
    Santa Fe and Snyder the operations, historical financial statements and
    future prospects (before and after giving effect to the merger) of Santa
    Fe and Snyder, as well as their views of the business, operational and
    strategic benefits and other implications of the merger, including the
    Expected Synergies and such other matters as Chase deemed necessary or
    appropriate;
 
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<PAGE>
 
  . compared the financial and operational performance of Snyder and Santa Fe
    with publicly available information concerning certain other companies
    Chase deemed relevant and reviewed the relevant historical stock prices
    and trading volumes of the Santa Fe common stock, the Snyder common stock
    and certain publicly traded securities of such other companies;
 
  . reviewed the financial terms of certain recent business combinations and
    acquisition transactions Chase deemed relevant to the merger and
    otherwise relevant to Chase's inquiry; and
 
  . made such other analyses and examinations as Chase deemed necessary or
    appropriate.
 
   Chase assumed and relied upon, without assuming any responsibility for
verification, the accuracy and completeness of all of the financial and other
information provided to, discussed with, or reviewed by or for it, or publicly
available, for purposes of the Chase opinion. Chase relied upon the assurances
of management of Santa Fe and Snyder that they were not aware of any facts that
would make such information inaccurate or misleading. Chase neither made nor
obtained any independent evaluations or appraisals of the reserves or other
assets or liabilities of Santa Fe or Snyder, nor did it conduct a physical
inspection of the properties and facilities of Santa Fe or Snyder. With respect
to the oil and natural gas reserves of Santa Fe and Snyder, Chase relied upon
and assumed the accuracy of the reserve information provided to Chase by
management of Santa Fe and Snyder. Chase assumed that the non-historical
financial information and the Expected Synergies provided to or discussed with
it were reasonably determined on bases reflecting the best currently available
estimates and judgments of the managements of Santa Fe and Snyder as to the
future financial performance of Santa Fe and Snyder, as the case may be, and
the Expected Synergies. Chase further assumed that, in all material respects,
such future results and Expected Synergies will be realized in the amounts and
times indicated thereby. Chase expressed no view as to such non-historical
information or the assumptions on which they were based.
 
   For purposes of rendering the Chase opinion, Chase assumed, in all respects
material to its analysis, that the representations and warranties of each party
contained in the merger agreement were true and correct, that each party will
perform all of the covenants and agreements required to be performed by it
under the merger agreement and that all conditions to the consummation of the
merger will be satisfied without waiver thereof. Chase also assumed that all
material governmental, regulatory or other consents and approvals will be
obtained and that, in the course of obtaining any necessary governmental,
regulatory or other consents and approvals, or any amendments, modifications,
or waivers to any documents to which either Santa Fe or Snyder is a party, no
restrictions will be imposed or amendments, modifications or waivers made that
would have any material adverse effect on the contemplated benefits to Snyder
and Santa Fe of the merger. In addition, Chase assumed that the merger will
qualify as a tax-free reorganization for U.S. federal income tax purposes.
 
   The following summarizes the material analyses performed by Chase and
reviewed with the Santa Fe board at its meeting on January 12, 1999 in
connection with Chase's presentation and its opinion to the Santa Fe board
delivered at a meeting held on January 13, 1999.
 
   Relative Equity Performance Analysis. Chase compared the stock prices of the
Santa Fe common stock and the Snyder common stock for the period from August 1,
1997 to January 11, 1999 against the average stock prices for the following 12
publicly traded companies: Apache Corporation, Barrett Resources Corporation,
Cabot Oil & Gas Corporation, Cross Timbers Oil Company, Devon Energy
Corporation, Louis Dreyfus Natural Gas Corp., Newfield Exploration Company,
Noble Affiliates, Inc., Pogo Producing Company, The Houston Exploration
Company, Tom Brown, Inc. and Vintage Petroleum, Inc. This comparison showed
that during such period Santa Fe's share price fell by 20%, Snyder's share
price fell by 23% and the share prices for the 12 subject companies fell by an
average of 30%.
 
   Historical Exchange Ratio Analysis. Chase reviewed the historical trading
price of Snyder common stock relative to Santa Fe common stock based on closing
sale prices during the period from July 8, 1998 to January 11, 1999. This
analysis indicated an average ratio of 2.051 to one for the five trading days
ending on January 11, 1999, 1.971 to one for the 10 trading days ending on
January 11, 1999, 2.010 to one for the 20 trading days
 
                                       29
<PAGE>
 
ending on January 11, 1999, 1.959 to one for the 30 trading days ending on
January 11, 1999, 1.909 to one for the 60 trading days ending on January 11,
1999, 1.926 to one for the 90 trading days ending on January 11, 1999, and
1.940 to one for the six months ending on January 11, 1999.
 
   Net Asset Value Based on Discounted Cash Flow Analysis. Using a discounted
cash flow methodology based in part on information provided by Santa Fe and
Snyder, Chase calculated a range of net asset values of Santa Fe and Snyder and
a range of implied exchange ratios. In the analysis, Chase assumed two
alternative sets of prevailing prices at which oil and natural gas would sell:
$13.00 per Bbl of oil increasing by 3% per year and $1.90 per MMBtu of natural
gas increasing by 3% per year (the "Base Case") and $15.00 per Bbl of oil
increasing by 3% per year and $2.10 per MMBtu of natural gas increasing by 3%
per year (the "Alternative Case"). Chase also assumed a discount rate of 10%
for all domestic divisions and the Argentina division of Santa Fe, and a
discount rate of 15% for all other international divisions. In calculating the
values of proved reserves, probable and possible reserves, and exploration
potential, Chase assumed that proved reserves were equal to 100% of present
value, that probable reserves were equal to 35% to 70% of present value, that
possible reserves were equal to 10% to 25% of present value and that
exploration potential was equal to 5% to 10% of present value. Based on such
analysis, Chase calculated an implied exchange ratio of 2.13 for the
Alternative Case and 2.52 for the Base Case.
 
   Contribution Analysis. Chase analyzed the relative contributions of Santa Fe
and Snyder to the pro forma combined Santa Fe Snyder based in part on
information provided by Santa Fe and Snyder. The analysis indicated that Santa
Fe would contribute approximately 59% of firm value (defined as the market
value of equity plus total debt and preferred stock, if any, less cash), 69.4%
of estimated 1998 reserves and 59% of equity market value. The analysis also
indicated that the expected contributions of Santa Fe for 1998, 1999 and 2000
would be 62.4%, 59.2% and 62.1%, respectively, for EBITDAX (earnings before
interest, taxes, depreciation, amortization and exploration expense), 71.8%,
70.1% and 68.2%, respectively, for production and 66.2%, 60.7% and 62.7%,
respectively, for discretionary cash flow ("DCF") (DCF is equal to net income
plus depreciation, depletion and amortization, taxes and exploration expense
and any extraordinary items). Based on such analysis Chase calculated an
implied exchange ratio range of 1.21 to 2.15.
 
   Accretion/Dilution Analysis. Chase analyzed the expected pro forma impact of
the merger on earnings per share, cash flow per share and net asset value per
share for Santa Fe and Snyder for 1999, 2000 and 2001. The analysis assumed $20
million in synergies per year and was based on the diluted shares outstanding
and the proposed exchange ratio of 2.05. The pro forma results were calculated
based in part on information provided by Santa Fe and Snyder. Chase noted that
the merger would be accretive to Santa Fe's earnings per share and cash flow
per share in each of 1999, 2000 and 2001. Chase also noted that the merger
would be accretive to the net asset value per share of Santa Fe.
 
   Comparable Company Public Market Valuation. Chase compared certain financial
ratios for Santa Fe and Snyder to those for selected groups of companies. Such
comparisons were based in part on information provided by Santa Fe and Snyder
to Chase and on pro forma estimates for the selected companies which were based
on available public consensus estimates. Santa Fe was compared to the following
five companies: Apache Corporation, Devon Energy Corporation, Noble Affiliates,
Inc., Pogo Producing Company and Vintage Petroleum, Inc. (collectively, the
"Santa Fe Group"). Snyder was compared to the following seven companies:
Barrett Resources Corporation, Cabot Oil & Gas Corporation, Cross Timbers Oil
Company, Louis Dreyfus Natural Gas Corp., Newfield Exploration Company, The
Houston Exploration Company and Tom Brown, Inc. (collectively, the "Snyder
Group"). Chase noted that firm equity value as a multiple of estimated EBITDAX
ranged from 5.4x to 9.1x for 1998 and 4.2x to 6.5x for 1999 for the Santa Fe
Group, and from 5.1x to 8.4x for 1998 and 4.3x to 5.7x for 1999 for the Snyder
Group. Using the multiples for the Santa Fe Group, Chase calculated an implied
firm value for Santa Fe of $942.5 million to $1,087.0 million based on 1998
estimated EBITDAX, and of $836.7 million to $1,004.0 million based on 1999
estimated EBITDAX. Using the multiples for the Snyder Group, Chase calculated
an implied firm value for Snyder of $517.5 million to $603.7 million based on
1998 estimated EBITDAX, and of $546.8 million to $656.2 million based on 1999
estimated EBITDAX. Using the multiples for the Santa Fe Group, Chase calculated
an implied
 
                                       30
<PAGE>
 
share price for Santa Fe of $6.29 to $7.70 based on 1998 estimated EBITDAX, and
of $5.27 to $6.89 based on 1999 estimated EBITDAX. Using the multiples for the
Snyder Group, Chase calculated an implied share price for Snyder of $11.15 to
$13.73 based on 1998 estimated EBITDAX, and of $12.03 to $15.30 based on 1999
estimated EBITDAX.
 
   Chase also examined equity values as multiples of 1998 and 1999 estimated
DCF and noted that equity values as a multiple of estimated DCF ranged from
4.0x to 8.7x for 1998 and 4.4x to 7.3x for 1999 for the Santa Fe Group, and
from 4.3x to 7.9x for 1998 and 3.2x to 6.7x for 1999 for the Snyder Group.
Using the multiples for the Santa Fe Group, Chase calculated an implied firm
value for Santa Fe of $1,002.4 million to $1,144.4 million based on 1998
estimated DCF, and of $932.7 million to $1,075.0 million based on 1999
estimated DCF. Using the multiples for the Snyder Group, Chase calculated an
implied firm value for Snyder of $529.7 million to $602.1 million based on 1998
estimated DCF, and of $577.3 million to $668.4 million based on 1999 estimated
DCF. Using the multiples for the Santa Fe Group, Chase calculated an implied
share price for Santa Fe of $6.87 to $8.25 based on 1998 estimated DCF, and of
$6.20 to $7.58 based on 1999 estimated DCF. Using the multiples for the Snyder
Group, Chase calculated an implied share price for Snyder of $11.51 to $13.68
based on 1998 estimated DCF, and of $12.94 to $15.66 based on 1999 estimated
DCF (including $0.67 per share attributable to current market values of certain
equity investments of Snyder).
 
   Based on such analysis, Chase calculated an average implied firm value
ranging from $928.6 million to $1,077.7 million for Santa Fe and from $542.8
million to $632.6 million for Snyder. The average implied share price was
calculated to range from $6.16 to $7.60 for Santa Fe and from $11.91 to $14.59
for Snyder. Based on such analyses, Chase calculated an implied exchange ratio
range of 1.57 to 2.37.
 
   None of the selected companies reviewed were identical to Santa Fe or
Snyder, and, accordingly, an analysis of the foregoing necessarily involves
complex considerations and judgments concerning differences in financial and
operational characteristics of the companies involved and other factors that
could affect the companies compared to Santa Fe and Snyder.
 
   Precedent Transaction Public Market Valuation. Chase analyzed the purchase
price and transaction value multiples of 17 selected transactions in the oil
and gas industry that were announced in 1997 and 1998. Such analyses were based
on publicly available information for the exchange ratios in the relevant
transactions and the information for Santa Fe and Snyder provided to Chase.
Chase noted that firm values as a multiple of 1998 estimated EBITDAX ranged
from 4.2x to 12.8x, that firm values per 1998 proved BOE ranged from $4.95 to
$14.66, and that firm values as a multiple of 1998 estimated after tax present
value of proved reserves ranged from 0.9x to 2.4x. Based upon these
comparisons, Chase calculated an average implied firm value ranging from
$1,052.3 million to $1,225.7 million for Santa Fe and from $610.9 million to
$712.2 million for Snyder, and an average implied share price ranging from
$7.05 to $8.73 for Santa Fe and from $13.36 to $16.39 for Snyder. Based on such
analysis Chase calculated an implied exchange ratio range from 1.53 to 2.32.
 
   None of the selected transactions reviewed were identical to the merger,
and, accordingly, an analysis of the foregoing necessarily involves complex
considerations and judgments concerning differences in financial and
operational characteristics of the companies involved in the selected
transactions and other factors that could affect the acquisition of the
transactions selected compared to the merger.
 
   Premiums Paid Analysis. Using publicly available information, Chase analyzed
stock premiums paid in 15 selected completed or pending transactions that were
not limited to the oil and gas industry that were announced as mergers of
equals between January 1, 1995 and January 11, 1999 with transaction values
between $1 billion and $3 billion. Chase examined the premiums over the trading
prices based upon stock prices one day, one week and four weeks prior to the
announcement of the selected transactions. The average premiums for the
selected transactions over the trading prices one day, one week and four weeks
prior to the announcement dates were 5.3%, 7.0% and 10.6%, respectively. The
high premiums for the selected transactions over the trading prices based on
stock prices one day, one week and four weeks prior to the announcement
 
                                       31
<PAGE>
 
dates were 34.0%, 31.8% and 35.7%, respectively, and the low premiums were
- -16.1%, -9.8% and -10.6%, respectively. Using the January 11, 1999 stock prices
of $14.25 for Snyder and $6.63 for Santa Fe, the premiums paid analysis led to
an implied exchange ratio range of 1.80 to 2.88.
 
   None of the selected transactions reviewed were identical to the merger,
and, accordingly, an analysis of the foregoing necessarily involves complex
considerations and judgments concerning differences in financial and
operational characteristics of the companies involved in the selected merger of
equals transactions and other factors that could affect the acquisition of the
transactions selected compared to the merger.
 
   The preparation of a fairness opinion is a complex process and involves
various judgments and determinations as to the most appropriate and relevant
assumptions and financial analyses and the application of these methods to the
particular circumstances involved. Such an opinion is, therefore, not readily
susceptible to partial analysis or summary description and taking portions of
the analyses set out above, without considering the analysis as a whole, would,
in the opinion of Chase, create an incomplete and misleading picture of the
processes underlying the analyses considered in rendering the Chase opinion.
Chase did not form an opinion as to whether any individual analysis, considered
in isolation, supported or failed to support the Chase opinion. In arriving at
its opinion, Chase considered the results of all such analyses and did not
attribute particular weight to any one analysis or factor considered by it. The
analyses performed by Chase, particularly those based on forecasts, are not
necessarily indicative of actual values or actual future results, which may be
significantly more or less favorable than suggested by such analyses. Such
analyses were prepared solely as part of Chase's analysis of the fairness, from
a financial point of view, to the stockholders of Santa Fe, other than Snyder
and its affiliates, of the exchange ratio in the merger. The foregoing summary
does not purport to be a complete description of the analyses prepared by Chase
and is qualified in its entirety by reference to the full text of the Chase
opinion.
 
   Chase, as part of its financial advisory business, is continually engaged in
the valuation of businesses and their securities in connection with mergers and
acquisitions and valuations for estate, corporate and other purposes. The Chase
Manhattan Corporation and its affiliates, including Chase, in the ordinary
course of business, have, from time to time, provided, and in the future may
continue to provide, commercial and/or investment banking services to Santa Fe
and Snyder, including serving as agent bank under Santa Fe's senior credit
facility. In the ordinary course of business, Chase or its affiliates may trade
in the debt and equity securities of Santa Fe and Snyder for its own accounts
and for the accounts of its customers and, accordingly, may at any time hold a
long or short position in such securities.
 
   During 1997, Chase participated in an underwriting syndicate related to
Snyder's offering of $175 million principal amount of 8.75% Senior Subordinated
Notes for which Chase received customary commissions and fees. Chase is also
one of the lending banks under Snyder's credit facility. Neither Santa Fe nor
Chase believe this prior dealing created any risk of a meaningful conflict
precluding Chase's objective representation of Santa Fe for purposes of opining
on the fairness to Santa Fe stockholders of the exchange ratio in the merger
from a financial point of view.
 
   The terms of the engagement of Chase by Santa Fe are set forth in a letter
agreement, dated January 11, 1999, between Chase and Santa Fe (the "Engagement
Letter"). Pursuant to the terms of the Engagement Letter, a fee of $500,000 was
payable to Chase upon the date on which Chase advised the Santa Fe board that
it was prepared to render an opinion. Chase will receive an additional
$1,500,000 upon consummation of the merger, and in the alternative, a fee if
the merger transaction fails to occur and Santa Fe receives a termination fee
from Snyder. In addition, Santa Fe has agreed to reimburse Chase for its
reasonable out-of-pocket expenses, including reasonable fees and disbursements
of its counsel and reasonable travel and other out-of-pocket expenses, and to
indemnify Chase against certain liabilities relating to or arising out of its
engagement. To the extent that such indemnification includes liabilities
arising under the federal securities laws, it may not be enforceable as it may
be determined to be against public policy.
 
 
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<PAGE>
 
DLJ Opinion
 
   In arriving at its opinion, DLJ reviewed the merger agreement; reviewed
certain publicly available business and financial information relating to Santa
Fe and Snyder; reviewed certain business and financial information, including
certain information as to future financial results, relating to Santa Fe and
Snyder, prepared by the respective managements based on, among other things,
(1) certain estimates of proved and non-proved reserves, (2) projected annual
production of such reserves in certain domestic and international areas and (3)
amounts and timing of the cost savings and operating synergies expected to
result from a combination of the businesses of Santa Fe and Snyder; discussed
the historical operating and financial data and performance of Santa Fe and
Snyder with management and operating personnel of each company; discussed
operating and other information prepared by the respective managements of Santa
Fe and Snyder with management and operating personnel of Santa Fe and Snyder as
well as their views of the business, operating and strategic benefits of the
merger, including the amount and timing of cost savings and operating synergies
expected to result from the merger; compared certain financial, operating and
securities data of Santa Fe and Snyder with various other companies that DLJ
deemed relevant; reviewed the historical stock prices and trading volumes of
the Santa Fe common stock and the Snyder common stock; compared financial terms
of the merger with the financial terms of certain other transactions that DLJ
deemed relevant; and conducted such other financial studies, analyses and
investigations as DLJ deemed necessary and appropriate for purposes of its
opinion.
 
   In rendering its opinion, DLJ relied upon and assumed the accuracy and
completeness of all of the financial and other information that was available
to it from public sources and that was provided to DLJ by Santa Fe and Snyder
or their respective representatives. In particular, DLJ relied upon the
estimates of the managements of Santa Fe and Snyder of the operating synergies
achievable as a result of the merger and its discussion of such synergies with
the managements of Santa Fe and Snyder. With respect to the non-historical
financial information supplied to DLJ, DLJ assumed that such information was
reasonably prepared on the basis reflecting the best currently available
estimates and judgments of the managements of Santa Fe and Snyder as to the
future operating and financial performance of each company, respectively. DLJ
did not assume any responsibility for making any independent evaluation of
Santa Fe's and Snyder's assets or liabilities or for making any independent
verification of any of the information reviewed by DLJ.
 
   In addition, DLJ assumed, in all respects material to its analysis, that the
representations and warranties of each party contained in the merger agreement
were true and correct, that each party will perform all of the covenants and
agreements required to be performed by it under the merger agreement and that
all conditions to the consummation of the merger will be satisfied without
waiver thereof. DLJ also assumed that all material governmental, regulatory or
other consents and approvals will be obtained and that, in the course of
obtaining any necessary governmental, regulatory or other consents and
approvals, or any amendments, modifications, or waivers to any documents to
which either Santa Fe or Snyder is a party, no restrictions will be imposed or
amendments, modifications or waivers made that would have any material adverse
effect on the contemplated benefits to Santa Fe and Snyder of the merger. In
addition, DLJ assumed that the merger will qualify as a tax-free reorganization
for U.S. federal income tax purposes.
 
   The following summarizes the material analysis performed by DLJ and reviewed
with the Santa Fe board at its meeting on January 12, 1999 in connection with
DLJ's presentation and its opinion to the Santa Fe board at a meeting held on
January 13, 1999.
 
   The DLJ opinion was necessarily based on economic, market, financial and
other conditions as they existed on, and on the information made available to
it as of, the date of the DLJ opinion. It should be understood that, although
subsequent developments may affect its opinion, DLJ does not have any
obligation to update, revise or reaffirm the DLJ opinion. The DLJ opinion does
not address the relative merits of the proposed merger or other business
strategies being considered by the Santa Fe board, nor does it address the
Santa Fe board's decision to proceed with the proposed merger.
 
                                       33
<PAGE>
 
   Set forth below is a summary of the material analyses performed by DLJ in
connection with the preparation of the DLJ opinion and included in the
presentation made by DLJ to the Santa Fe board on January 12, 1999.
 
   Net Asset Value Based on Discounted Cash Flow Analysis. DLJ estimated, at a
range of discount rates and risk factors and under two oil and gas price
scenarios, the present value of the future cash flows that Santa Fe could be
expected to generate from its proved, probable and possible reserves as of
January 1, 1999 based on reserve, production and production cost estimates
provided by Santa Fe management. DLJ also estimated a range of present values
for cash flows from identified potential exploration prospects. DLJ arrived at
a range of present values of future cash flows by using the price scenarios,
discount rates and risk factors described below.
 
   The range of discount rates used was chosen by DLJ and based on an analysis
of the weighted average cost of capital of Santa Fe, as well as various
industry benchmarks and assumptions provided by and discussed with Santa Fe
management. The range of risk factors used was chosen by DLJ and based on
various industry benchmarks and assumptions provided by and discussed with
Santa Fe management. DLJ added to such estimated values for proved, probable
and possible reserves and potential exploration prospects assessments of the
value of certain other assets and liabilities of Santa Fe, including other land
and acreage, working capital and debt to arrive at a net asset value ("NAV")
for Santa Fe. These assessments were made by DLJ based on information provided
by Santa Fe's management and on various industry benchmarks and assumptions
provided by and discussed with Santa Fe management.
 
   DLJ estimated, at a range of discount rates and risk factors and under two
oil and gas price scenarios, the present value of the future cash flows that
Snyder could be expected to generate from its proved, probable and possible
reserves as of January 1, 1999 based on reserve, production and production cost
estimates provided by Snyder management. DLJ also estimated a range of present
values for cash flows from identified potential exploration prospects. DLJ
arrived at a present value of future cash flows by using the price scenarios,
discount rates and risk factors described below.
 
   The range of discount rates used was chosen by DLJ and based on an analysis
of the weighted average cost of capital of Snyder, as well as various industry
benchmarks and assumptions provided by and discussed with the managements of
Snyder and Santa Fe. The range of risk factors used was chosen by DLJ and based
on various industry benchmarks and assumptions provided by and discussed with
Santa Fe management. DLJ added to such estimated values for proved, probable
and possible reserves and potential exploration prospects assessments of the
value of certain other assets and liabilities of Snyder, including other land
and acreage, working capital and debt to arrive at an NAV for Snyder. These
assessments were made by DLJ based on information provided by the managements
of Snyder and Santa Fe and on various industry benchmarks and assumptions
provided by and discussed with Santa Fe management.
 
   The NAV analysis was performed utilizing two pricing scenarios. The base
case assumed NYMEX West Texas Intermediate oil prices of $13.00/barrel with 3%
annual escalation and NYMEX Henry Hub natural gas prices of $1.80/MMBtu with 3%
annual escalation. The alternative case used $15.00/barrel and $2.00/MMBtu for
oil and natural gas prices, respectively, with 3% annual escalation. Discount
rates and risk factors were assigned based upon domestic and international
determination. Domestic operations were assigned discount rates between 8% and
10% while international operations were assigned discount rates of between 10%
and 20%. Reserve category risks were assigned weightings as follows: proved
reserves, 90% to 100% of present value; probable reserves, 50% to 70% of
present value and possible reserves, 20% of present value. Potential
exploration prospects were assigned 0% to 10% of estimated present value,
valued at $1.00 to $2.00 per barrel of oil equivalent risked reserve potential.
 
                                       34
<PAGE>
 
   The exchange ratio of Santa Fe shares per Snyder share implied from this
analysis ranged from a high of 2.33x to a low of 1.98x. Because the proposed
exchange ratio of 2.05x was within this range, this analysis supported the DLJ
opinion.
 
   Contribution Analysis. Based in part upon information provided by Santa Fe
and Snyder, DLJ analyzed the relative contributions of each company to the pro
forma combined company for the years 1999 through 2000. DLJ analyzed the
respective contributions of each company's earnings before interest, taxes,
depreciation, amortization and exploration expense ("EBITDAX") and net income
plus deferred taxes, depreciation, amortization, exploration expense and other
non-cash charges ("After-Tax Cash Flow") for the last twelve-month reporting
period before the announcement ended on September 30, 1998 ("LTM"), and for the
estimated twelve-month periods ending December 31 of 1998 ("1998E"), 1999
("1999E") and 2000 ("2000E"). DLJ also analyzed the respective contributions of
each company's 1998E, 1999E and 2000E production as well as 1998E proved
reserves.
 
   Based upon this analysis, DLJ determined that Santa Fe would contribute
EBITDAX on a pro forma basis as follows: 66.6% of LTM; 62.6% of 1998E; 60.5% of
1999E and 62.5% of 2000E. Therefore, adjusting for different levels of leverage
at the two companies, the implied percentage of equity value contributed by
Santa Fe based on pro forma EBITDAX was as follows: 68.0% of LTM; 62.3% of
1998E; 59.2% of 1999E and 62.1% of 2000E.
 
   Based upon this analysis, Santa Fe would contribute After-Tax Cash Flow on a
pro forma basis as follows: 73.4% of LTM; 66.2% of 1998E; 60.7% of 1999E and
62.8% of 2000E. The implied percentage of equity contributed by Santa Fe's
After-Tax Cash Flow on a pro forma basis was equivalent to the above
percentages.
 
   Based upon this analysis, Santa Fe would contribute total production on a
pro forma basis as follows: 69.2% of 1998E; 68.1% of 1999E; 66.7% of 2000E. The
implied percentage of equity value contributed by Santa Fe based on a pro forma
production was as follows: 71.7% of 1998E; 70.1% of 1999E; 68.2% of 2000E.
 
   In addition, DLJ reviewed 1998E proved reserves contributions of each
company on an MMBOE basis and concluded that Santa Fe would contribute 67.6% of
pro forma reserves which implies 69.3% of equity value.
 
   The contribution analysis as performed using EBITDAX, production and proved
reserves relates to respective contributions to pro forma combined Enterprise
Value (as defined below). Therefore, the contribution analysis based on these
measures was adjusted for leverage at Santa Fe and Snyder. The implied percent
of equity value denotes each respective company's share of pro forma equity
based on its contribution to Enterprise Value, accounting for the debt
contributed by each of Santa Fe and Snyder, respectively.
 
   The exchange ratio of Santa Fe shares per Snyder share implied from this
analysis ranged from a high of 2.21x to a low of 1.12x. Because the proposed
exchange ratio of 2.05x was within this range, this analysis supported the DLJ
opinion.
 
   Comparable Company Analysis. To provide contextual data and comparative
market information, DLJ compared selected share price, earnings and operating
and financial ratios for Santa Fe and Snyder to the corresponding data and
ratios of two separate groups of companies whose securities are publicly
traded. Although no company used in the comparable company analysis is
identical to either Santa Fe or Snyder, DLJ believes the selected groups of
companies to be appropriate comparisons to the respective companies. Santa Fe
was compared to Apache Corporation; Enron Oil & Gas Company; Noble Affiliates,
Inc.; Nuevo Energy Company; Pogo Producing Company; and Vintage Petroleum, Inc.
Snyder was compared to Barrett Resources Corporation; Cross Timbers Oil
Company; Devon Energy Corporation; Tom Brown, Inc.; Burlington Resources Inc.;
and Louis Dreyfus Natural Gas Corp.
 
   Such data and ratios included measures of value defined by market
capitalization of common stock ("Equity Value") plus total debt, preferred
stock and minority interest less cash and cash equivalents of the
 
                                       35
<PAGE>
 
comparable companies ("Enterprise Value") as a multiple of LTM EBITDAX, 1998E
EBITDAX, 1999E EBITDAX, 1997 proved reserves and 1997 pre-tax SEC PV-10. In
addition, ratios included Equity Value as a multiple of LTM After-Tax Cash
Flow, 1998E After-Tax Cash Flow and 1999E After-Tax Cash Flow. The comparable
company analysis was conducted based upon closing share prices on January 8,
1999.
 
   DLJ analyzed Enterprise Value as a multiple of estimated EBITDAX for both
companies. In the analysis of the Santa Fe group, this ranged from 4.2x to 6.8x
for LTM, 4.9x to 10.7x for 1998E and 4.9x to 8.3x for 1999E. Based upon these
multiples, implied Santa Fe per share values were between $3.81 and $8.12 for
LTM, $3.74 and $11.91 for 1998E and $4.83 and $10.37 for 1999E. In the analysis
of the Snyder group, the Enterprise Value multiples ranged from 6.2x to 8.7x
for LTM, 6.5x to 11.2x for 1998E and 5.5x to 8.5x for 1999E. Based upon these
multiples, implied Snyder per share values were between $10.24 and $16.62 for
LTM, $11.19 and $23.32 for 1998E and $12.42 and $22.24 for 1999E.
 
   DLJ also analyzed Equity Value as a multiple of estimated After-Tax Cash
Flow for both companies. In the analysis of the Santa Fe group, this ranged
from 3.1x to 5.4x for LTM, 3.6x to 6.0x for 1998E and 3.7x to 5.1x for 1999E.
Based upon these multiples, implied Santa Fe per share values were between
$5.36 and $9.34 for LTM, $4.97 and $8.28 for 1998E and $5.10 and $7.02 for
1999E. In the analysis of the Snyder group, the After-Tax Cash Flow multiples
ranged from 3.9x to 9.0x for LTM, 3.9x to 8.3x for 1998E and 3.2x to 7.4x for
1999E. Based upon these multiples, implied Snyder per share values were between
$7.53 and $17.37 for LTM, $8.46 and $18.00 for 1998E and $8.72 and $20.17 for
1999E.
 
   DLJ also analyzed Enterprise Value per BOE of year-end 1997 Reserves for
both companies. In the analysis of the Santa Fe group, this ranged from $2.27
to $6.47 per BOE. Based upon these values, implied Santa Fe per share values
were between $0.63 and $7.63. In the analysis of the Snyder group, the reserve
values ranged from $5.40 to $6.71 per BOE. Based upon these values, implied
Snyder per share values were between $6.90 and $9.93.
 
   DLJ also analyzed Enterprise Value as a percent of year-end 1997 pre-tax SEC
PV-10 for both companies. In the analysis of the Santa Fe group, this ranged
from 53% to 175%. Based upon these values, implied Santa Fe per share values
were between $0.77 and $9.80. In the analysis of the Snyder group, the pre-tax
SEC PV-10 percentage ranged from 97% to 146%. Based upon these values, implied
Snyder per share values were between $5.30 and $10.81.
 
   The implied exchange ratio of Santa Fe shares per Snyder share was
calculated by taking the ratio of implied Santa Fe per share values to implied
Snyder per share values from this analysis. These ratios ranged from a high of
2.79x to a low of 1.55x. Because the proposed exchange ratio of 2.05x was
within this range, this analysis supported the DLJ opinion.
 
   Comparable Transactions Analysis. DLJ reviewed publicly available
information for a number of selected transactions involving the combination of
exploration and production companies completed since January 1, 1997. The
transactions selected were not intended to represent a complete list of
exploration and production company transactions that have occurred during the
last two years. Rather, they include transactions involving combinations of
companies with operating characteristics, size or geographical focus that DLJ
believed to be comparable to such characteristics of Santa Fe or of Snyder.
Santa Fe valuations were compared to the valuations of the following
transactions: Mesa, Inc. / Greenhill Petroleum Corporation; Mesa, Inc. / Parker
& Parsley Petroleum Company; Burlington Resources Inc. / The Louisiana Land and
Exploration Company; Belco Oil & Gas Corp. / Coda Energy, Inc.; Ocean Energy,
Inc. / United Meridian Corporation; and Atlantic Richfield Company / Union
Texas Petroleum Holdings, Inc. Snyder valuations were compared to the
valuations of the following transactions: TPG Partners II L.P. / Belden & Blake
Corporation; Forcenergy, Inc. / Edisto Resources Corporation; Louis Dreyfus
Natural Gas Corp. / American Exploration Company; Chesapeake Energy
Corporation / Hugoton Energy Corporation; and Sonat Inc. / Zilkha Energy
Company.
 
 
                                       36
<PAGE>
 
   Although these transactions were used for comparison purposes, none of such
transactions is directly comparable to the merger. An analysis of comparable
transactions is not purely mathematical, rather it involves complex
considerations and judgments concerning similarities and differences in
financial, operational and other characteristics of potentially comparable
transactions. DLJ reviewed the consideration paid in such comparable
transactions in terms of valuation parameters commonly used in the valuation of
exploration and production companies in the oil and gas industry.
 
   DLJ reviewed the consideration paid in such comparable transactions in terms
of Enterprise Value as a multiple of LTM EBITDAX for both groups of comparable
transactions. In the analysis of the Santa Fe group, this ranged from multiples
of 5.6x to 8.3x which implied Santa Fe per share values of between $6.09 and
$10.57. In the analysis of the Snyder group, this ranged from multiples of 6.1x
to 9.1x which implied Snyder per share values of between $10.05 and $17.73.
 
   DLJ reviewed the consideration paid in such comparable transactions in terms
of Enterprise Value per BOE based upon year end 1997 reserves for both groups
of comparable transactions. In the analysis of the Santa Fe group, this ranged
from values of $5.76 to $10.98 per BOE which implied Santa Fe per share values
of between $6.46 and $15.16. In the analysis of the Snyder group, this ranged
from values of $7.32 to $12.64 per BOE which implied Snyder per share values of
between $11.33 and $23.64.
 
   DLJ reviewed the consideration paid in such comparable transactions in terms
of Enterprise Value to 1997 pre-tax SEC PV-10 for both groups of comparable
transactions. In the analysis of the Santa Fe group, this ranged from values of
61% to 221% which implied Santa Fe per share values of between $1.33 and
$13.22. In the analysis of the Snyder group, this ranged from values of 87% to
293% which implied Snyder per share values of between $4.15 and $27.35.
 
   DLJ also reviewed the consideration paid in such comparable transactions in
terms of Equity Value to LTM After-Tax Cash Flow for both groups of comparable
transactions. In the analysis of the Santa Fe group, this ranged from multiples
of 5.8x to 9.8x which implied Santa Fe per share values of between $10.00 and
$16.87. In the analysis of the Snyder group, this ranged from multiples of 5.6x
to 8.8x which implied Snyder per share values of between $10.83 and $17.07.
 
   The implied exchange ratio of Santa Fe shares per Snyder share calculated by
taking the ratio of implied Santa Fe per share values to implied Snyder per
share values from this analysis ranged from a high 2.47x to a low of 1.28x.
Because the proposed exchange ratio of 2.05x was within this range, this
analysis supported the DLJ opinion.
 
   Historical Exchange Ratio Analysis. DLJ reviewed the relative valuation of
common stock between Santa Fe and Snyder for the six month period ending
January 8, 1999. DLJ determined that as of the close of trading on January 8,
the exchange ratio was 2.21x Santa Fe common shares per Snyder common share.
DLJ also determined that for the five trading days ending on January 8, 1999
the average exchange ratio was 1.98x, for the month prior to January 8, 1999
the average exchange ratio was 2.01x, for the 60 days prior thereto the average
exchange ratio was 1.88x, for the 90 days prior thereto the average exchange
ratio was 1.91x and for the six months prior thereto the average exchange ratio
was 1.94x. Because the proposed exchange ratio of 2.05x was within the range of
historical exchange ratios, this analysis supported the DLJ opinion.
 
   Pro Forma Merger Analysis. DLJ also performed a pro forma merger analysis
for the years ending December 31, 1999, 2000 and 2001 based in part on
information provided by the management of Santa Fe and Snyder to determine the
impact of the merger on Santa Fe's net income per share ("EPS") and After-Tax
Cash Flow per share. DLJ determined, based upon various assumptions, including
estimation of future realized prices of oil and gas, that the merger would be
accretive to Santa Fe EPS for the years ending December 31, 1999, 2000 and
2001. In addition, DLJ determined that the merger would be accretive to After-
Tax Cash Flow per share in the years ended December 31, 1999, 2000 and 2001.
DLJ included synergies related to the elimination of $20.0 million in pro forma
general and administrative, operating and exploration expenses in its analysis.
 
                                       37
<PAGE>
 
Because this analysis indicates the merger will be accretive to Santa Fe
shareholders on both an EPS and an After-Tax Cash Flow basis, this analysis
supported the DLJ opinion.
 
   The summary set forth above, which sets forth all of the material provisions
of such fairness opinions, does not purport to be a complete description of the
analyses performed by DLJ. The preparation of a fairness opinion involves
various determinations as to the most appropriate and relevant methods of
financial analysis and the application of these methods to the particular
circumstances and, therefore, such an opinion is not readily susceptible to
summary description. Each of the analyses conducted by DLJ was carried out in
order to provide a different perspective on the merger and add to the total mix
of information available. DLJ did not form a conclusion as to whether any
individual analysis, considered in isolation, supported or failed to support an
opinion as to fairness. Rather, in reaching its conclusion, DLJ considered the
results of the analyses in light of each other and ultimately reached its
opinion based on the results of all analyses taken as a whole. DLJ did not
place particular reliance or weight on any individual analysis, but instead
concluded that its analyses, taken as a whole, supported its determination.
Accordingly, notwithstanding the separate factors summarized above, DLJ
believes that its analyses must be considered as a whole and that selecting
portions of its analysis and the factors considered by it, without considering
all analyses and factors, could create an incomplete or misleading view of the
evaluation process underlying its opinion. In performing its analyses, DLJ made
numerous assumptions with respect to industry performance, business and
economic conditions and other matters. The analyses performed by DLJ are not
necessarily indicative of actual values or future results, which may be
significantly more or less favorable than suggested by such analyses.
 
   Pursuant to terms of an engagement letter agreement, dated January 11, 1998,
between DLJ and Santa Fe, (1) a fee of $500,000 was payable to DLJ upon the
date on which DLJ advised the board that it was prepared to render an opinion
and (2) Santa Fe has agreed to pay an additional fee of $1.5 million to DLJ
upon the successful completion of the merger, and, in the alternative, a fee if
the merger transaction fails to occur and Santa Fe receives a termination fee
from Snyder. Santa Fe has also agreed to reimburse DLJ for its reasonable
expenses (including, without limitation, professional and legal fees and
disbursements) incurred in connection with its engagement, and to indemnify DLJ
and related persons against certain liabilities in connection with its
engagement, including certain liabilities that may arise under the federal
securities laws (which may be unenforceable as it may be determined to be
against public policy). DLJ has previously rendered financial advisory and
investment banking services to Santa Fe, for which it has received customary
compensation.
 
   In the ordinary course of business, DLJ may actively trade the securities of
Santa Fe and Snyder for its own account and for the accounts of its customers
and, accordingly, may at any time hold a long or short position in such
securities.
 
   Snyder's Financial Advisor.
 
   Snyder engaged Petrie Parkman as its financial advisor in March 1997 to
provide advisory and investment banking services with respect to advancing
Snyder's strategic objectives. On January 8, 1999, Snyder entered into an
amended engagement with Petrie Parkman in connection with a potential
combination between Snyder and Santa Fe. On January 13, 1999, Petrie Parkman
rendered to the Snyder board its oral opinion (which was subsequently confirmed
in writing) that, as of such date and based upon and subject to the matters set
forth therein, the exchange ratio of 2.05 shares of Santa Fe common stock for
each share of Snyder common stock was fair from a financial point of view to
the holders of Snyder common stock. No limitations were imposed by Snyder upon
Petrie Parkman with respect to the investigations made or procedures followed
by Petrie Parkman in rendering its opinion.
 
   Set forth below is a summary of Petrie Parkman's fairness opinion, which
summary discloses all of the material provisions of such fairness opinion. The
full text of Petrie Parkman's opinion dated January 13, 1999, which contains a
description of the assumptions made, the matters considered by Petrie Parkman
and the limits of its review, is attached hereto as Annex D and is incorporated
herein by reference. Snyder stockholders are encouraged to read the opinion
carefully in its entirety. Petrie
 
                                       38
<PAGE>
 
Parkman's opinion was provided to the Snyder board for its information and is
directed to the fairness from a financial point of view, to the holders of the
Snyder common stock, of the exchange ratio of 2.05 shares of Santa Fe common
stock for each share of Snyder common stock. Petrie Parkman's opinion does not
constitute a recommendation to any holder of Snyder common stock as to how such
holder should vote at the Snyder special meeting. Petrie Parkman's opinion and
its presentation to the Snyder board on January 11, 1999 were among many
factors taken into consideration by the Snyder board in making its
determination to approve and recommend the merger as contemplated in the merger
agreement.
 
   In arriving at its opinion, Petrie Parkman, among other things:
 
  .  reviewed certain publicly available business and financial information
     relating to Snyder and Santa Fe, including (a) the Annual Report on Form
     10-K and related audited financial statements for the fiscal year ended
     December 31, 1997, (b) the unaudited financial statements for the fiscal
     quarters ended March 31, 1998, June 30, 1998 and September 30, 1998, (c)
     the unaudited financial statements of Snyder for the year to date period
     ended October 31, 1998, which includes an income statement for the month
     of October 1998, prepared by the management of Snyder, (d) a projection
     dated December 14, 1998 of the balance sheet of Snyder as of December
     31, 1998 and the related income statement for the year ended December
     31, 1998, prepared by the management of Snyder, (e) a projection dated
     December 16, 1998 of the balance sheet of Santa Fe as of December 31,
     1998, prepared by the management of Santa Fe and (f) a projection dated
     December 16, 1998 of the income statement for the fiscal quarter ended
     December 31, 1998, prepared by the management of Santa Fe;
 
  .  reviewed certain estimates of Snyder's reserves, including (a) estimates
     of proved oil and gas reserves prepared by Netherland, Sewell &
     Associates, Inc. as of December 31, 1997, (b) unaudited proved,
     probable, possible and other oil and gas reserves prepared by the
     management and staff of Snyder as of June 30, 1998 and (c) preliminary
     estimates of proved, probable, possible and other oil and gas reserves
     prepared by the management and staff of Snyder as of December 31, 1998;
 
  .  reviewed certain estimates of Santa Fe's reserves, including (a)
     preliminary estimates of proved, probable and possible oil and gas
     reserves of Santa Fe in the United States offshore Gulf of Mexico,
     onshore United States Gulf Coast and Argentina prepared by Ryder Scott
     Petroleum Engineers as of January 1, 1999, (b) preliminary estimates of
     proved, probable and possible oil and gas reserves of Santa Fe in the
     Jabung field in Indonesia prepared by DeGolyer and MacNaughton as of
     October 31, 1998 and (c) preliminary estimates of proved, probable,
     possible and other oil and gas reserves of Santa Fe prepared by the
     management and staff of Santa Fe as of January 1, 1999;
 
  .  analyzed certain historical and other financial and operating data of
     Snyder and Santa Fe prepared by the management of Snyder and Santa Fe,
     respectively;
 
  .  discussed the current and projected operations and prospects of Snyder
     and Santa Fe with the management and operating staff of Snyder and Santa
     Fe, respectively;
 
  .  reviewed the historical trading history of the Snyder common stock and
     the Santa Fe common stock;
 
  .  compared recent stock market capitalization indicators for Snyder and
     Santa Fe with the recent stock market capitalization indicators for
     certain other publicly traded independent energy companies;
 
  .  compared the financial terms of the merger with the financial terms of
     certain other transactions that they deemed to be relevant;
 
  .  reviewed the merger agreement; and
 
  .  reviewed such other financial studies and analyses and performed such
     other investigations and took into account such other matters as they
     deemed necessary or appropriate.
 
                                       39
<PAGE>
 
   In rendering its opinion, Petrie Parkman assumed and relied upon, without
assuming any responsibility for verification, the accuracy and completeness of
any information supplied or otherwise made available to it by Snyder and Santa
Fe. Petrie Parkman further relied upon the assurances of the management of
Snyder and Santa Fe that they were unaware of any facts that would make the
information provided to Petrie Parkman incomplete or misleading in any material
respect. With respect to non-historical financial and operating data, Petrie
Parkman assumed that they had been reasonably prepared on bases reflecting the
best currently available estimates and judgment of the management of Snyder and
Santa Fe, respectively, relating to the future financial and operational
performance of Snyder and Santa Fe. With respect to the estimates of oil and
gas reserves, Petrie Parkman assumed that they had been reasonably prepared on
bases reflecting the best available estimates and judgments of Snyder and Santa
Fe or their respective engineering consultants relating to the oil and gas
properties of Snyder and Santa Fe. Petrie Parkman did not make an independent
evaluation or appraisal of the assets or liabilities of Snyder or Santa Fe nor,
except for the estimates of oil and gas reserves referred to above, was Petrie
Parkman furnished with such an evaluation or appraisal. Consistent with the
merger agreement, Petrie Parkman assumed that the merger will be treated for
federal income tax purposes as a reorganization within the meaning of Section
368(a) of the Internal Revenue Code of 1986.
 
   The following is a summary of certain analyses performed by Petrie Parkman
in connection with the preparation of its opinion dated January 13, 1999 and
reviewed with the Snyder board on January 11, 1999.
 
   Discounted Cash Flow Analysis--Snyder. Petrie Parkman conducted a discounted
cash flow analysis for the purpose of determining the equity reference value
range per share of Snyder common stock. Petrie Parkman calculated the net
present value of estimates of future after-tax cash flows for Snyder's oil and
gas reserve assets based on the reserve estimates referred to above and for its
non-reserve assets utilizing information provided by Snyder.
 
   Petrie Parkman evaluated three scenarios in which the principal variables
were oil and gas prices. The three pricing scenarios were based on benchmarks
for spot sales of West Texas Intermediate crude oil and for spot sales of Henry
Hub gas ("Pricing Case I," "Pricing Case II" and "Pricing Case III," and
collectively "Pricing Cases I, II, and III"). Petrie Parkman applied
appropriate quality and transportation adjustments to these benchmarks.
Benchmark oil prices for Pricing Cases I, II and III were projected to be
$13.00, $15.00 and $17.00 per barrel, respectively, for 1999 and were escalated
annually thereafter at the rates of 3.0%, 3.0% and 4.0%, respectively; oil
prices in each pricing case were capped at $60.00 per barrel. Benchmark gas
prices for Pricing Cases I, II and III were projected to be $2.00, $2.20 and
$2.40 per MMBtu, respectively, for 1999 and were escalated annually thereafter
at the rates of 3.0%, 3.0% and 4.0%, respectively; gas prices in each pricing
case were capped at $6.00 per MMBtu. Operating and capital costs were escalated
at 3.0% per year.
 
   Assuming a carry-over of Snyder's existing tax positions, and applying
after-tax discount rates ranging from 10.0% to 40.0% to the after tax cash
flows, depending on reserve category, the discounted cash flow analysis
indicated asset reference value ranges of $465.8 million to $568.5 million for
Pricing Case I, $548.6 million to $668.5 million for Pricing Case II and $677.8
million to $827.1 million for Pricing Case III. After deducting long-term
obligations of Snyder of $214.7 million from the asset reference value ranges
and dividing by the number of shares of Snyder common stock outstanding, the
indicated equity reference value ranges per share of Snyder common stock
outstanding were $7.53 to $10.61 for Pricing Case I, $10.02 to $13.61 for
Pricing Case II and $13.89 to $18.37 for Pricing Case III.
 
   Comparable Transactions Analysis--Snyder. Petrie Parkman reviewed certain
publicly available information on 135 oil and gas property acquisition
transactions involving Rocky Mountain, Gulf of Mexico and East Texas / Gulf
Coast assets that took place between January 1996 and December 1998 (and four
such transactions for which Petrie Parkman had non-public information). Petrie
Parkman calculated purchase price multiples of equivalent reserves for the
acquired assets in each transaction. The highest, average and lowest multiples
of equivalent reserves for the Rocky Mountain transactions were $2.91, $0.74
and $0.22 per Mcfe cubic feet equivalent using a 6.0 Mcf to one barrel of oil
conversion ratio ("Mcfe6"), respectively. The highest, average and lowest
multiples of Mcfe6 for the Gulf of Mexico transactions were $1.49, $1.08 and
 
                                       40
<PAGE>
 
$0.59, respectively. The highest, average and lowest multiples of Mcfe6 for the
East Texas / Gulf Coast transactions were $4.37, $0.95 and $0.33, respectively.
Petrie Parkman determined that, with respect to Snyder, the appropriate
benchmark multiples for equivalent proved reserves for the Rocky Mountain, Gulf
of Mexico and East Texas / Gulf Coast assets were in the ranges of $0.80 to
$0.95 per Mcfe6, $1.00 to $1.25 per Mcfe6, and $0.70 to $1.00 per Mcfe6,
respectively. Petrie Parkman applied the benchmarks to Snyder's corresponding
proved reserve figures for each of the geographic regions to yield asset
reference value ranges for Snyder's reserves. Following adjustments for
Snyder's non-reserve assets, Petrie Parkman determined from the asset reference
value ranges implied by these multiples a composite asset reference value range
of $600.0 million to $725.0 million. After deducting long-term obligations of
Snyder of $214.7 million from the composite asset reference value range and
dividing by the number of shares of Snyder common stock outstanding, the
resulting composite equity reference value range per share of Snyder common
stock outstanding was $11.56 to $15.31.
 
                                       41
<PAGE>
 
   In addition, Petrie Parkman reviewed certain publicly available information
on the following 41 company acquisition transactions and offers for control in
the oil and gas exploration and production industry that took place between
January 1996 and December 1998:
 
<TABLE>
<CAPTION>
Acquiror or Bidder for                                              Date of
Control                                  Target                  Announcement
- ----------------------                   ------                -----------------
<S>                       <C>                                  <C>
Chevron Corp.             Rutherford-Moran Oil Corp.           December 23, 1998
Exxon Corp.               Mobil Corp.                           December 1, 1998
Seagull Energy Corp.      Ocean Energy, Inc.                   November 25, 1998
Kerr-McGee Corp.          Oryx Energy Company                   October 15, 1998
British Petroleum Co.     Amoco Corp.                            August 11, 1998
Devon Energy Corp.        Northstar Energy                         June 29, 1998
USX-Marathon Group        Tarragon Oil & Gas Ltd.                   May 30, 1998
Pogo Producing Company    Arch Petroleum Inc.                       May 29, 1998
Lomak Petroleum, Inc.     Domain Energy Corp.                       May 12, 1998
Atlantic Richfield
 Company                  Union Texas Petroleum Holdings, Inc.       May 4, 1998
Seneca Resources Corp.    Harcor Energy, Inc.                     March 31, 1998
Dominion Energy, Inc.     Archer Resources, Ltd.                  March 11, 1998
Union Pacific Resources
 Group, Inc.              Norcen Energy Resources, Inc.         January 26, 1998
Ocean Energy, Inc.        United Meridian Corp.                December 23, 1997
Sonat, Inc.               Zilkha Energy Company                November 24, 1997
Chesapeake Energy Corp.   Hugoton Energy Corp.                 November 13, 1997
Belco Oil & Gas Corp.     Coda Energy, Inc.                     November 3, 1997
Titan Exploration, Inc.   Offshore Energy Development Corp.    September 9, 1997
Pioneer Natural
 Resources Company        Chauvco Resources Ltd.               September 3, 1997
Texaco Inc.               Monterey Resources, Inc.               August 18, 1997
Burlington Resources
 Inc.                     Louisiana Land & Exploration Company     July 17, 1997
The Meridian Resource
 Corporation              Cairn Energy USA, Inc.                    July 8, 1997
Crestar Energy Inc.       Grad & Walker Energy Corp.                July 2, 1997
Louis Dreyfus Natural
 Gas Corp.                American Exploration Company             June 24, 1997
Union Pacific Resources
 Group Inc.               Pennzoil Company                         June 23, 1997
Forcenergy Inc            Convest Energy Corporation               June 20, 1997
Monterey Resources, Inc.  McFarland Energy, Inc.                   June 17, 1997
The Columbia Gas System
 Inc.                     Alamco, Inc.                              May 27, 1997
Mesa Inc.                 Parker & Parsley Petroleum Company       April 7, 1997
Texas Pacific Group       Belden & Blake Corp.                    March 31, 1997
Northstar Energy Corp.    Morrison Petroleum Ltd.              February 13, 1997
Forcenergy Inc            Great Western Resources Inc.         December 12, 1996
KCS Energy, Inc.          InterCoast Oil and Gas                October 17, 1996
Tom Brown, Inc.           Presidio Oil Company                    August 5, 1996
Seagull Energy
 Corporation              Global Natural Resources Inc.            July 22, 1996
Kaiser Francis Oil
 Company                  Petrocorp Incorporated                   June 17, 1996
Enron Capital & Trade
 Resources Corp.          Clinton Gas Systems, Inc.                 May 24, 1996
Apache Corporation        The Phoenix Resource Companies, Inc.    March 28, 1996
Mobil Corporation         Ampolex Limited                      February 28, 1996
HS Resources, Inc.        Tide West Oil Company                February 26, 1996
Snyder Oil Corporation    Gerrity Oil and Gas Corporation       January 17, 1996
</TABLE>
 
   Using publicly available information, Petrie Parkman calculated total
investment (which Petrie Parkman defined for the purposes of this analysis as
purchase price of equity plus net obligations assumed) multiples of gross pre-
tax cash flow for the target company in each transaction. For these 41
transactions, the highest, average and lowest multiples of gross pre-tax cash
flow were 29.8x, 7.9x and 2.8x, respectively. Petrie
 
                                       42
<PAGE>
 
Parkman also calculated purchase price multiples of discretionary cash flow and
implied purchase price (which Petrie Parkman defined for the purposes of this
analysis as total investment less estimated values of non-reserve assets)
multiples of equivalent proved reserves and standardized measure of discounted
future net cash flows ("SEC Value") for the target company in each transaction.
The highest, average and lowest multiples of discretionary cash flow were
24.6x, 7.5x and 3.1x, respectively. The highest, average and lowest multiples
of equivalent proved reserves were $3.99, $1.31 and $0.54 per Mcfe6,
respectively. The highest, average and lowest multiples of SEC Value for 33 of
the 41 transactions for which data was available were 5.8x, 1.3x and 0.6x,
respectively. Petrie Parkman determined that, with respect to Snyder, the
appropriate benchmark multiples for gross pre-tax cash flow, discretionary cash
flow, equivalent proved reserves and SEC Value were in the ranges of 7.0 to
10.0x, 6.0 to 9.0x, $0.80 to $1.50 per Mcfe6 and 1.7 to 2.5x, respectively.
Petrie Parkman applied these benchmark multiples to Snyder's historical gross
pre-tax cash flow, discretionary cash flow, equivalent proved reserves and SEC
Value.
 
   Petrie Parkman also performed a premium analysis, which compared the offer
price per target company share with the target company's share price for the
periods of one day, 30 days and 60 days prior to public announcement of the
offer. The highest, average and lowest premiums (which Petrie Parkman defined
for the purposes of this analysis as excess of offer price over target
company's price stated as a percentage above the target company's share price)
were 86.6%, 22.5% and -9.8% for one day prior, respectively, 75.6%, 30.1% and-
7.5% for 30 days prior, respectively, and 86.6%, 24.7% and -55.2% for 60 days
prior, respectively. Petrie Parkman determined that, with respect to Snyder,
the appropriate benchmarks for premium to target company's price one day prior,
30 days prior, and 60 days prior were in the ranges of 5% to 25%, 10% to 30%,
and 10% to 35%, respectively. Petrie Parkman applied these premium benchmarks
to the corresponding stock prices of Snyder. Petrie Parkman determined from the
asset reference value ranges implied by these multiples a composite asset
reference value range of $650.0 million to $800.0 million. After deducting
long-term obligations of Snyder of $214.7 million from the composite asset
reference value range and dividing by the number of shares of Snyder common
stock outstanding, the resulting composite equity reference value range per
share of Snyder common stock outstanding was $13.06 to $17.56.
 
   Common Stock Comparison--Snyder. Using publicly available information,
Petrie Parkman calculated adjusted capitalization multiples of historical
financial criteria for earnings before interest, income taxes, depletion,
depreciation and amortization, and exploration expense ("EBITDX"), operating
cash flow and SEC Value and of equivalent proved reserves for 103 publicly
traded independent oil and gas companies. Petrie Parkman also calculated market
capitalization (which Petrie Parkman defined for purpose of this analysis as
market value of common equity) multiples of historical financial criteria for
discretionary cash flow for such companies. The adjusted capitalization of each
company was obtained by adding the sum of its long-term and short-term debt to
the sum of the market value of its common equity, the market value of its
preferred stock (or, if not publicly traded, liquidation or book value) and the
book value of its minority interest in other companies and subtracting its
cash.
 
   Petrie Parkman determined that 11 companies were relevant to an evaluation
of Snyder in the context of reserve location, reserve mix, and reserve life.
Accordingly, Petrie Parkman examined in greater detail the following companies:
 
  .  Barrett Resources Corporation
  .  Cabot Oil and Gas Corporation
  .  Cross Timbers Oil Company
  .  Devon Energy Corporation
  .  Forest Oil Corporation
  .  HS Resources, Inc.
  .  KCS Energy, Inc.
  .  Kelley Oil and Gas Corporation
  .  Louis Dreyfus Natural Gas Corporation
  .  Newfield Exploration Company
  .  Tom Brown, Inc.
 
                                       43
<PAGE>
 
   For these 11 companies, the highest, average and lowest adjusted
capitalization multiples of latest twelve months ("LTM") EBITDX were 21.1x,
7.7x and 4.2x, respectively. The highest, average and lowest adjusted
capitalization multiples of 1998 estimated EBITDX were 13.7x, 7.4x and 5.6x,
respectively. The highest, average and lowest adjusted capitalization multiples
of LTM operating cash flow were 14.9x, 6.3x and 3.8x, respectively. The
highest, average and lowest adjusted capitalization multiples of equivalent
proved reserves were $2.36, $1.09 and $0.57 per Mcfe6, respectively. The
highest, average and lowest adjusted capitalization multiples of SEC Value were
2.0x, 1.5x and 1.0x, respectively. The highest, average and lowest market
capitalization multiples of LTM discretionary cash flow were 6.4x, 4.1x and
1.4x, respectively. The highest, average and lowest market capitalization
multiples of 1998 estimated discretionary cash flow were 8.2x, 4.7x and 1.7x,
respectively. The highest, average and lowest market capitalization multiples
of 1999 estimated discretionary cash flow were 7.2x, 4.1x and 1.6x,
respectively. Petrie Parkman determined that, with respect to Snyder, the
appropriate benchmarks for adjusted capitalization multiples for LTM EBITDX,
1998 estimated EBITDX, LTM operating cash flow, equivalent proved reserves and
SEC Value were in the ranges of 7.0 to 9.0x, 7.0 to 9.0x, 6.0 to 7.5x, $1.00 to
$1.20 per Mcfe6 and 1.7 to 2.1x, respectively, and that the appropriate
benchmark market capitalization multiples for LTM discretionary cash flow, 1998
estimated discretionary cash flow, and 1999 estimated discretionary cash flow
were in the range of 5.0 to 6.5x, 5.5 to 7.5x, and 5.0 to 7.0x, respectively.
Petrie Parkman applied these benchmark multiples to Snyder's LTM and 1998
estimated EBITDX, LTM operating cash flow, SEC Value, LTM, 1998 estimated and
1999 estimated discretionary cash flow and equivalent proved reserves based on
the reserve estimates referred to above. From the asset reference value ranges
implied by these multiples, Petrie Parkman determined a composite asset
reference value range under this method of $600.0 million to $750.0 million.
After subtracting long-term obligations of Snyder of $214.7 million and
dividing by the number of shares of Snyder common stock outstanding, the
composite equity reference value range per share of Snyder common stock
outstanding was $11.56 to $16.06.
 
   Going Concern Analysis--Snyder. Petrie Parkman projected the potential
financial performance of Snyder without giving effect to the merger for the
five year period beginning on January 1, 1999 using Pricing Cases I, II and
III. Petrie Parkman prepared these projections utilizing information prepared
or provided by Snyder management and two capital cases. The first case (the
"$0.75/Mcfe6 Finding and Development Cost Case") was based on Snyder's internal
company plan dated December 14, 1998 with capital in excess of that provided
for in the company plan reinvested for reserve additions at $0.75/Mcfe6. The
second case (the "$1.00/Mcfe6 Finding and Development Cost Case") employed the
same assumptions as the $0.75/Mcfe6 Finding and Development Cost Case but
assumed reinvestment for reserve additions based on a finding and development
cost of $1.00/Mcfe6. Capital expenditure levels were based on Snyder's
estimated capital budget plus an additional $75 million, $100 million, and $100
million in 2001, 2002, and 2003, respectively, when using Pricing Case II and
Pricing Case III. Petrie Parkman calculated a range of terminal equity values
by applying terminal multiples of 5.0x, 6.0x and 7.0x to projected 2003
discretionary cash flow. It applied discount rates of 15.0% to 17.5% to
terminal equity values. Throughout its analysis, it utilized Snyder's existing
tax position.
 
   A terminal multiple of 5.0x projected 2003 discretionary cash flow yielded
equity reference values per share of Snyder common stock outstanding under the
$0.75/Mcfe6 Finding and Development Cost ("$0.75/Mcfe6 Finding and Development
Costs") Case of $7.21 to $7.86 using Pricing Case I, $12.23 to $13.33 using
Pricing Case II and $16.51 to $17.99 using Pricing Case III, and under the
$1.00/Mcfe6 Finding and Development Cost ("$1.00/Mcfe6 Finding and Development
Costs") Case of $7.21 to $7.86 using Pricing Case I, $11.22 to $12.23 using
Pricing Case II and $14.91 to $16.25 using Pricing Case III. A terminal
multiple of 6.0x projected 2003 discretionary cash flow yielded equity
reference values per share of Snyder common stock outstanding under the
$0.75/Mcfe6 Finding and Development Cost Case of $8.56 to $9.53 using Pricing
Case I, $14.71 to $16.03 using Pricing Case II and $19.56 to $21.31 using
Pricing Case III, and under the $1.00/Mcfe6 Finding and Development Cost Case
of $8.56 to $9.53 using Pricing Case I, $13.50 to $14.71 using Pricing Case II
and $17.22 to $19.31 using Pricing Case III. A terminal multiple of 7.0x
projected 2003 discretionary cash flow yielded equity reference values per
share of Snyder common stock outstanding under the $0.75/Mcfe6 Finding and
Development Cost Case of $9.91 to $10.80 using Pricing Case I, $17.19 to $18.73
using Pricing Case II and $22.60 to $24.63 using Pricing Case III, and under
the $1.00/Mcfe6 Finding
 
                                       44
<PAGE>
 
and Development Cost Case of $9.91 to $10.80 using Pricing Case I, $15.78 to
$17.79 using Pricing Case II and $20.53 to $22.37 using Pricing Case III. From
these equity reference value ranges, Petrie Parkman determined a composite
equity reference value range per share of Snyder common stock outstanding of
$18.00 to $23.50 for the $0.75/Mcfe6 Finding and Development Cost Case and
$14.00 to $18.50 for the $1.00/Mcfe6 Finding and Development Cost Case.
 
   The following is a summary of Snyder's implied reference ranges of asset and
equity values derived from Petrie Parkman's discounted cash flow analysis,
comparable transaction analysis, capital market comparison and going-concern
analysis.
<TABLE>
<CAPTION>
                                                         Asset
                                                       Reference      Equity
                                                      Value Range    Reference
                                                         ($ in      Value Range
                    Method of Analysis                 millions)      ($/Sh.)
                    ------------------               ------------- -------------
      <S>                                            <C>           <C>
      Discounted Cash Flow
      Pricing Case I................................ $465.8-$568.5  $7.53-$10.61
      Pricing Case II............................... $548.6-$668.5 $10.02-$13.61
      Pricing Case III.............................. $677.8-$827.1 $13.89-$18.37
      Comparable Transactions
      Property Transactions......................... $600.0-$725.0 $11.56-$15.31
      Company Transactions.......................... $650.0-$800.0 $13.06-$17.56
      Capital Market Comparison
      Peer Multiples................................ $600.0-$750.0 $11.56-$16.06
      Going Concern Analysis
      $0.75/Mcfe6 F&D Costs......................... $814.7-$998.1 $18.00-$23.50
      $1.00/Mcfe6 F&D Costs......................... $681.4-$831.4 $14.00-$18.50
</TABLE>
 
   Discounted Cash Flow Analysis--Santa Fe. Petrie Parkman conducted a
discounted cash flow analysis for the purpose of determining the equity
reference value range per share of Santa Fe common stock. Petrie Parkman
calculated the net present value of estimates of future after-tax cash flows
for Santa Fe's oil and gas reserve assets based on the reserve estimates
referred to above and its non-reserve assets utilizing information provided by
Santa Fe under Pricing Cases I, II and III described above. Assuming a carry-
over of Santa Fe's existing tax position and applying after-tax discount rates
ranging from 10.0% to 30.0%, depending on reserve category, to the after tax
cash flow, the discounted cash flow analysis indicated asset reference value
ranges of $619.7 million to $805.3 million for Pricing Case I, $838.4 million
to $1,070.2 million for Pricing Case II and $1,130.9 million to $1,427.4
million for Pricing Case III. After deducting long-term obligations of Santa Fe
of $332.0 million from the asset reference value ranges and dividing by the
number of shares of Santa Fe common stock outstanding, the indicated equity
reference value ranges per share of Santa Fe common stock outstanding are $2.81
to $4.63 for Pricing Case I, $4.95 to $7.22 for Pricing Case II and $7.82 to
$10.72 for Pricing Case III.
 
   Comparable Transactions Analysis--Santa Fe. Petrie Parkman reviewed certain
publicly available information on 68 oil and gas property acquisition
transactions involving Permian, Gulf of Mexico/Gulf Coast and international
assets that took place between January 1996 and December 1998 (and one such
transaction for which Petrie Parkman had non-public information). Petrie
Parkman calculated purchase price multiples of equivalent reserves for the
acquired assets in each transaction. The highest, average and lowest multiples
of equivalent reserves for the Permian transactions were $11.33, $4.66 and
$1.39 per barrel of oil equivalent using a 6.0 Mcf to one barrel of oil
conversion ratio ("Boe6"), respectively. The highest, average and lowest
multiples of Boe6 for the Gulf of Mexico/Gulf Coast transactions were $8.96,
$6.51 and $3.69, respectively. The highest, average and lowest multiples of
Boe6 for the international transactions were $9.76, $4.96 and $0.64,
respectively. Petrie Parkman determined that, with respect to Santa Fe, the
appropriate benchmark multiples for equivalent proved reserves for the Permian,
Gulf of Mexico/Gulf Coast and International assets were in the ranges of $3.75
to $4.75 per Boe6, $6.00 to $7.50 per Boe6, and $4.50 to $6.50 per Boe6,
respectively. Petrie Parkman applied the benchmarks to Santa Fe's corresponding
proved reserve figures for each of the geographic regions to yield asset
reference value ranges for Santa Fe's reserves. Following
 
                                       45
<PAGE>
 
adjustments for Santa Fe's non-reserve assets, Petrie Parkman determined from
the asset reference value ranges implied by these multiples a composite asset
reference value range of $950.0 million to $1.3 billion. After deducting long-
term obligations of Santa Fe of $332.0 million from the composite asset
reference value range and dividing by the number of shares of Santa Fe common
stock outstanding, the resulting composite equity reference value range per
share of Santa Fe common stock outstanding was $6.05 to $9.47.
 
   In addition, Petrie Parkman reviewed certain publicly available information
on the 41 company acquisition transactions and offers for control described
above. Petrie Parkman determined that, with respect to Santa Fe, the
appropriate benchmark multiples for gross pre-tax cash flow, discretionary cash
flow, equivalent proved reserves and SEC Value were in the ranges of 5.0 to
8.0x, 4.0 to 7.5x, $4.50 to $7.00 per Boe6 and 1.5 to 2.0x, respectively.
Petrie Parkman applied these benchmark multiples to Santa Fe's historical gross
pre-tax cash flow, discretionary cash flow, equivalent proved reserves and SEC
Value. Petrie Parkman also performed a premium analysis as described above.
Petrie Parkman determined that, with respect to Santa Fe, the appropriate
benchmarks for premium to target company's price one day prior, 30 days prior,
and 60 days prior were in the ranges of 5% to 25%, 10% to 30%, and 10% to 35%,
respectively. Petrie Parkman applied these premium benchmarks to the
corresponding stock prices of Santa Fe. Petrie Parkman determined from the
asset reference value ranges implied by these multiples a composite asset
reference value range under this method of $1.0 billion to $1.3 billion. After
deducting long-term obligations of Santa Fe of $332.0 million from the
composite asset reference value range and dividing by the number of shares of
Santa Fe common stock outstanding, the resulting composite equity reference
value range per share of Santa Fe common stock outstanding was $6.53 to $9.47.
 
   Common Stock Comparisons--Santa Fe. Using publicly available information,
Petrie Parkman calculated adjusted capitalization multiples of historical
financial criteria for EBITDX, operating cash flow and SEC Value and of
equivalent proved reserves for 103 publicly traded independent oil and gas
companies. Petrie Parkman also calculated market capitalization multiples of
historical financial criteria for discretionary cash flow for such companies.
 
   Petrie Parkman determined that 13 companies were relevant to an evaluation
of Santa Fe in the context of reserve location, reserve mix and reserve life.
Accordingly, Petrie Parkman examined in greater detail the following companies:
 
  .  Anadarko Petroleum Corporation
  .  Apache Corporation
  .  EEX Corporation
  .  Enron Oil & Gas Company
  .  Kerr-McGee Corporation
  .  Ocean Energy, Inc.
  .  Oryx Energy Company
  .  PennzEnergy Company
  .  Pioneer Natural Resources Company
  .  Pogo Producing Company
  .  Seagull Energy Corporation
  .  Triton Energy Limited
  .  Vintage Petroleum, Inc.
 
   For these 13 companies, the highest, average and lowest adjusted
capitalization multiples of LTM EBITDX were 15.1x, 6.7x and 3.1x, respectively.
The highest, average and lowest adjusted capitalization multiples of 1998
estimated EBITDX were 18.3x, 7.0x and 3.9x, respectively. The highest, average
and lowest adjusted capitalization multiples of LTM operating cash flow were
12.0x, 5.3x and 3.1x, respectively. The highest, average and lowest adjusted
capitalization multiples of equivalent proved reserves were $8.04, $5.35 and
$2.09 per Boe6, respectively. The highest, average and lowest adjusted
capitalization multiples of SEC Value were 2.5x, 1.6x and 0.7x, respectively.
The highest, average and lowest market capitalization multiples
 
                                       46
<PAGE>
 
of LTM discretionary cash flow were 13.2x, 4.0x and 1.6x, respectively. The
highest, average and lowest market capitalization multiples of 1998 estimated
discretionary cash flow were 46.7x, 8.3x and 1.7x, respectively. The highest,
average and lowest market capitalization multiples of 1999 estimated
discretionary cash flow were 16.7x, 5.5x and 1.4x, respectively. Petrie Parkman
determined that, with respect to Santa Fe, the appropriate benchmarks for
adjusted capitalization multiples for LTM EBITDX, 1998 estimated EBITDX, LTM
operating cash flow, equivalent proved reserves and SEC Value were in the
ranges of 4.5 to 6.5x, 5.5 to 7.0x, 4.0 to 6.0x, $4.00 to $5.25 per Boe6 and
1.0 to 1.5x, respectively, and that the appropriate benchmark market
capitalization multiples for LTM discretionary cash flow, 1998 estimated
discretionary cash flow and 1999 estimated discretionary cash flow were in the
range of 3.5 to 5.0x, 4.0 to 6.0x and 3.0 to 5.0x, respectively. Petrie Parkman
applied these benchmark multiples to Santa Fe's LTM and 1998 estimated EBITDX,
LTM operating cash flow, SEC Value, LTM, 1998 estimated and 1999 estimated
discretionary cash flow and equivalent proved reserves based on the reserve
estimates referred to above. From the asset reference value ranges implied by
these multiples, Petrie Parkman determined a composite asset reference value
range under this method of $900.0 million to $1.2 billion. After subtracting
long-term obligations of Santa Fe of $332.0 million and dividing by the number
of shares of Santa Fe common stock outstanding, the composite equity reference
value range per share of Santa Fe common stock outstanding was $5.56 to $8.49.
 
   Going Concern Analysis--Santa Fe. Petrie Parkman projected the potential
financial performance of Santa Fe without giving effect to the merger for the
five year period beginning on January 1, 1999 using Pricing Cases I, II and
III. Petrie Parkman prepared these projections utilizing information prepared
or provided by Santa Fe management and two capital cases. The first case (the
"$4.50/Boe6 Finding and Development Cost Case") was based on Santa Fe's
internal company plan dated December 16, 1998 with capital in excess of the
company plan reinvested for reserve additions at $4.50/Boe6. The second case
(the "$6.00/Boe6 Finding and Development Cost Case") employed the same
assumptions as the $4.50/Boe6 Finding and Development Cost Case but assumed
reinvestment for reserve additions based on a finding and development cost of
$6.00/Boe6. Capital expenditure levels were based on Santa Fe's estimated
capital budget plus an additional $200 million and $250 million in 2002 and
2003, respectively, when using Pricing Cases II and III. Petrie Parkman
calculated a range of terminal equity values by applying terminal multiples of
4.0x, 5.0x and 6.0x to projected 2003 discretionary cash flow. It applied
discount rates of 15.0% to 17.5% to terminal equity values. Throughout its
analysis, it utilized Santa Fe's existing tax position.
 
   A terminal multiple of 4.0x projected 2003 discretionary cash flow yielded
equity reference values per share of Santa Fe common stock outstanding under
the $4.50/Boe6 Finding and Development Cost ("$4.50/Boe6 Finding and
Development Costs") Case of $5.22 to $5.69 using Pricing Case I, $8.31 to $9.05
using Pricing Case II and $10.76 to $11.72 using Pricing Case III, and under
the $6.00/Boe6 Finding and Development Cost ("$6.00/Boe6 Finding & Development
Costs") Case of $5.22 to $5.69 using Pricing Case I, $7.91 to $8.62 using
Pricing Case II and $10.45 to $11.39 using Pricing Case III. A terminal
multiple of 5.0x projected 2003 discretionary cash flow yielded equity
reference values per share of Santa Fe common stock outstanding under the
$4.50/Boe6 Finding and Development Cost Case of $6.53 to $7.11 using Pricing
Case I, $10.38 to $11.31 using Pricing Case II and $13.45 to $14.66 using
Pricing Case III, and under the $6.00/Boe6 Finding and Development Cost Case of
$6.53 to $7.11 using Pricing Case I, $9.89 to $10.77 using Pricing Case II and
$13.07 to $14.24 using Pricing Case III. A terminal multiple of 6.0x projected
2003 discretionary cash flow yielded equity reference values per share of Santa
Fe common stock outstanding under the $4.50/Boe6 Finding and Development Cost
Case of $7.83 to $8.54 using Pricing Case I, $12.46 to $13.58 using Pricing
Case II and $16.14 to $17.59 using Pricing Case III, and under the $6.00/Boe6
Finding and Development Cost Case of $7.83 to $8.54 using Pricing Case I,
$11.86 to $12.93 using Pricing Case II and $15.68 to $17.09 using Pricing Case
III. From these equity reference value ranges, Petrie Parkman determined a
composite equity reference value range per share of Santa Fe common stock
outstanding of $8.25 to $13.00 for the $4.50/Boe6 Finding and Development Cost
Case and $6.75 to $10.25 for the $6.00/Boe6 Finding and Development Cost Case.
 
                                       47
<PAGE>
 
   The following is a summary of Santa Fe's implied reference ranges of asset
and equity values derived from Petrie Parkman's discounted cash flow analysis,
comparable transaction analysis, capital market comparison and going-concern
analysis.
<TABLE>
<CAPTION>
                                                                       Equity
                                                   Asset Reference   Reference
                                                     Value Range    Value Range
                  Method of Analysis               ($ in millions)    ($/Sh.)
                  ------------------              ----------------- ------------
      <S>                                         <C>               <C>
      Discounted Cash Flow
      Pricing Case I.............................     $619.7-$805.3  $2.81-$4.63
      Pricing Case II............................   $838.4-$1,070.2  $4.95-$7.22
      Pricing Case III........................... $1,130.9-$1,427.4 $7.82-$10.72
      Comparable Transactions
      Property Transactions......................   $950.0-$1,300.0  $6.05-$9.47
      Company Transactions....................... $1,000.0-$1,300.0  $6.53-$9.47
      Capital Market Comparison
      Peer Multiples.............................   $900.0-$1,200.0  $5.56-$8.49
      Going Concern Analysis
      $4.50/Boe6 F&D Costs....................... $1,175.3-$1,660.9 $8.25-$13.00
      $6.00/Boe6 F&D Costs....................... $1,022.0-$1,379.8 $6.75-$10.25
</TABLE>
 
   Contribution Analysis. Petrie Parkman analyzed certain historical and
projected financial and operational effects of the merger for the three-year
period beginning January 1, 1997. Petrie Parkman calculated relative
contributions of year-end reserves, daily production, sales revenues, EBITDX,
discretionary cash flow, book asset value, shareholders equity, net debt,
market value and enterprise value. The analysis was based on historical
measures and management forecasts for each of Snyder and Santa Fe. The
following table sets forth the contribution Snyder would make to combined
financial position results and operations of Santa Fe Snyder.
 
<TABLE>
<CAPTION>
                                                  Year
                                                 Ending  Year Ending Year Ending
                                                12/31/97  12/31/98    12/31/99
                       Measure                  (Actual) (Estimated) (Estimated)
                       -------                  -------- ----------- -----------
      <S>                                       <C>      <C>         <C>
      Reserves.................................    31%        32%         32%
      Production...............................    29%        30%         32%
      Sales Revenue............................    35%        33%         34%
      EBITDX...................................    28%        36%         38%
      Discretionary Cash Flow..................    22%        33%         37%
      Book Asset Value.........................    39%        35%         33%
      Shareholders' Equity.....................    34%        32%         34%
      Net Debt.................................   n.a.        36%         32%
      Market Value.............................    33%        37%        n.a.
      Enterprise Value.........................    37%        38%        n.a.
</TABLE>
 
   Pro Forma Merger Analysis. Petrie Parkman analyzed certain pro forma
financial effects of the merger for the three-year period beginning January 1,
1999 using Pricing Cases I, II and III as described above. In connection with
such analysis, Petrie Parkman assessed the past performance of the managements
of Snyder and Santa Fe, reviewed the estimates and projections prepared or
provided by the managements of Snyder and Santa Fe and had discussions with
members of the management of Snyder and Santa Fe, respectively, with respect to
the current operations and the future financial and operating performance of
Santa Fe on a stand-alone basis and after giving effect to the merger, but
relied only to a limited degree on these estimates and projections in
conducting its pro forma merger analysis. In its analysis, Petrie Parkman
utilized the exchange ratio of 2.05 shares of Santa Fe common stock for each
share of Snyder common stock as set forth in the merger agreement and made
certain assumptions about cost savings and depreciation, depletion and
amortization expenses. This analysis indicated that the merger would be
accretive to projected Santa Fe earnings per share over the three-year period
ending December 31, 2001 using Pricing Case I, neutral to
 
                                       48
<PAGE>
 
accretive over the three-year period using Pricing Case II, and dilutive for
the fiscal years ending December 31, 1999 and 2000 and slightly accretive for
the fiscal year ending December 31, 2001 using Pricing Case III. The analysis
indicated that the merger would be slightly accretive to Santa Fe's
discretionary cash flow per share over the three-year period ending December
31, 2001 using Pricing Case I and slightly dilutive to neutral over the three-
year period using Pricing Case II and Pricing Case III. The analysis also
indicated that the merger would result in lower total debt to total book
capitalization ratios than projected for Santa Fe on a stand-alone basis for
the three-year period ending December 31, 2001 using Pricing Cases I, II and
III. The analysis also indicated that for the same three-year period, and using
Pricing Cases I, II and III, the merger would result in improved debt coverage
(debt to cash flow ratio) than projected for Santa Fe on a stand-alone basis.
 
   The description set forth above constitutes a summary of the analyses
employed by Petrie Parkman in rendering its opinion to the Snyder board. Petrie
Parkman believes that its analyses must be considered as a whole and that
selecting portions of its analyses considered by it, without considering all
analyses and factors, could create an incomplete view of the process underlying
its opinion. The preparation of a fairness opinion is a complex, analytical
process involving various determinations as to the most appropriate and
relevant methods of financial analysis and the application of those methods to
the particular circumstances and is not necessarily susceptible to partial
analysis or summary description. In arriving at its opinion, Petrie Parkman did
not attribute any particular weight to any analysis considered by it, but
rather made qualitative judgements as to the significance and relevance of each
analysis. Any estimates resulting therefrom are not necessarily indicative of
actual values, which may be significantly more or less favorable than as set
forth herein. In addition, analyses based on forecasts of future results are
not necessarily indicative of future results, which may be significantly more
or less favorable than suggested by such analyses. Estimates of reference
values of companies do not purport to be appraisals or necessarily reflect the
prices at which companies may actually be sold. Because such estimates are
inherently subject to uncertainty and based upon numerous factors or events
beyond the control of the parties or their respective advisors, no assurances
can be given that such estimates will prove to be accurate.
 
   No company used in the analysis of other publicly traded companies nor any
transaction used in the analyses of comparable transactions summarized above is
identical to Snyder, Santa Fe or the merger. Accordingly, such analyses must
take into account differences in the financial and operating characteristics of
the selected companies and the companies in the selected transactions and other
factors that would affect the public trading value and acquisition value of the
selected companies and the selected transactions, respectively.
 
   Petrie Parkman, as part of its investment banking business, is continually
engaged in the evaluation of energy-related businesses and their securities in
connection with mergers and acquisitions, negotiated underwritings, secondary
distributions of listed and unlisted securities, private placements and
valuations for corporate and other purposes. Snyder selected Petrie Parkman as
its financial advisor because it is a nationally recognized investment banking
firm that has substantial experience in transactions similar to the merger.
 
   Petrie Parkman has in the past provided financial advisory services to
Snyder and Santa Fe and has received customary fees for such services. In
particular, Petrie Parkman advised Santa Fe in connection with Santa Fe's
initial public offering of shares of, and the 1997 spin-off of its remaining
shares of, its subsidiary, Monterey. Additionally, a representative of Petrie
Parkman actively involved in advising Snyder in the merger negotiation and
preparation of the fairness opinion previously served as a senior executive of
Santa Fe and subsequently Monterey. None of Snyder, Santa Fe or Petrie Parkman
believe that this prior advisory or employment relationship created any risk of
a meaningful conflict precluding Petrie Parkman's objective representation of
Snyder for purposes of opining on the fairness of the exchange ratio to holders
of Snyder common stock.
 
   Pursuant to the terms of the engagement letter between Petrie Parkman and
Snyder dated March 26, 1997, as amended on January 8, 1999, Snyder has agreed
to pay Petrie Parkman a transaction fee (the "Transaction Fee"), contingent and
payable upon the consummation of the merger of Santa Fe and Snyder, in an
amount of $3 million. Whether or not the merger is consummated, Snyder has also
agreed to reimburse Petrie Parkman for
 
                                       49
<PAGE>
 
its out-of-pocket expenses, including reasonable fees and expenses of counsel,
and to indemnify Petrie Parkman and certain related persons against certain
liabilities relating to or arising out of its engagement, including certain
liabilities under federal securities laws. To the extent that such
indemnification includes liabilities arising under the federal securities laws,
it may not be enforceable as it may be determined to be against public policy.
 
Accounting Treatment
 
   The merger will be treated for accounting purposes in accordance with the
rules for purchase accounting. Under those rules, the assets and liabilities of
Snyder will be recorded on Santa Fe's books at their estimated fair market
values. See the "Notes to Unaudited Pro Forma Condensed Combined Financial
Statements" included elsewhere in this document.
 
Material U.S. Federal Income Tax Consequences
 
   The following is a summary of the material federal income tax consequences
that are expected to result from the merger. The summary does not purport to
deal with all aspects of federal income taxation that may affect particular
Snyder stockholders in light of their individual circumstances and is not
intended for holders of Snyder common stock subject to special treatment under
federal income tax law (including insurance companies, tax-exempt
organizations, financial institutions, broker-dealers, foreign persons or
entities, holders of Snyder common stock who do not hold their stock as capital
assets and holders of Snyder common stock who have acquired their stock upon
the exercise of employee options or otherwise as compensation). In addition,
this discussion does not consider the effect of any applicable state, local or
foreign tax laws. Accordingly, each Snyder stockholder is strongly urged to
consult with his tax advisor to determine the tax consequences of the merger.
 
   The following summary is based upon current provisions of the Internal
Revenue Code of 1986 (referred to as the Internal Revenue Code) currently
applicable Treasury regulations, and judicial and administrative decisions and
rulings. Future legislative, judicial or administrative changes or
interpretations could alter or modify the statements and conclusions set forth
herein, and any such changes or interpretations could be retroactive and could
affect the tax consequences to the Snyder stockholders.
 
   Tax Opinions Regarding the Merger. Consummation of the merger is conditioned
upon the receipt by Santa Fe of an opinion of Andrews & Kurth L.L.P. in form
and substance satisfactory to Santa Fe, and the receipt by Snyder of an opinion
of Vinson & Elkins L.L.P. in form and substance satisfactory to Snyder, and
which opinions, dated the effective time, will be based on certain facts,
representations and assumptions set forth in such opinions, to the effect that
the merger will qualify as a tax-free reorganization within the meaning of
Section 368(a) of the Internal Revenue Code and Santa Fe and Snyder will each
be a "party to a reorganization" as such phrase is described in Section 368(b)
of the Internal Revenue Code. Consummation of the merger is also conditioned
upon receipt by Snyder of an opinion of Vinson & Elkins L.L.P. to the effect
that, subject to the discussion below under "--Cash in Lieu of Fractional
Shares," Snyder stockholders will recognize no gain or loss by reason of the
merger upon the exchange of shares of Snyder common stock for shares of Santa
Fe common stock. There can be no assurance that the Internal Revenue Service
(also referred to as the IRS) will not take a contrary view, and no ruling from
the IRS has been or will be sought concerning the federal income tax
consequences of the merger. An opinion is not a guarantee of a certain tax
treatment and is not binding on the IRS or the courts. The following discussion
assumes that the merger will be treated in the manner described in the opinions
of Andrews & Kurth L.L.P. and Vinson & Elkins L.L.P.
 
   Treatment of Santa Fe and Snyder. Santa Fe and Snyder will each be "a party
to a reorganization" within the meaning of Section 368(b) of the Internal
Revenue Code. For federal income tax purposes, no gain or loss will be
recognized by Santa Fe or Snyder with respect to the exchange of Santa Fe
common stock and Snyder common stock as a result of the merger.
 
                                       50
<PAGE>
 
   Treatment of Holders of Snyder Common Stock. Except as discussed below under
"--Cash in Lieu of Fractional Shares," a holder of Snyder common stock who,
pursuant to the merger, exchanges Snyder common stock for Santa Fe common stock
generally will not recognize gain or loss upon such exchange. Such holder's
aggregate tax basis in Santa Fe common stock received pursuant to the merger
will be equal to its aggregate tax basis in Snyder common stock surrendered in
the exchange (reduced by any tax basis allocable to fractional shares exchanged
for cash) and its holding period for Santa Fe common stock will include its
holding period for Snyder common stock surrendered.
 
   Cash in Lieu of Fractional Shares. No fractional shares of Santa Fe common
stock will be issued upon the surrender for exchange of certificates
representing shares of Snyder common stock. A holder of Snyder common stock who
receives cash in lieu of fractional shares of Santa Fe common stock in exchange
for its Snyder common stock will be treated as having received such fractional
shares pursuant to the merger and then as having received cash for such
fractional shares in a redemption by Santa Fe. Any gain or loss attributable to
fractional shares generally will be capital gain or loss. The amount of such
gain or loss will be equal to the difference between the portion of the tax
basis of Snyder common stock surrendered in the merger that is allocated to
such fractional shares and the cash received in lieu thereof. Any such capital
gain or loss will constitute long-term capital gain or loss if Snyder common
stock has been held by the holder for more than one year at the effective time.
Capital gain on assets held for more than one year recognized by a non-
corporate stockholder is generally subject to federal income tax at a 20%
capital gain rate.
 
   Backup Withholding. Unless an exemption applies under the applicable law and
regulations, the exchange agent may be required to withhold, and, if required,
will withhold, 31% of any cash payments to a holder of Snyder common stock in
the merger unless such holder provides the appropriate form. A holder should
complete and sign the Substitute Form W-9 enclosed with the letter of
transmittal sent by the exchange agent so as to provide the information
(including the holder's taxpayer identification number) and certification
necessary to avoid backup withholding, unless an applicable exemption exists
and is proved in a manner satisfactory to the exchange agent.
 
   The foregoing summary of certain material federal income tax consequences of
the merger is without reference to the particular facts and circumstances of
any particular holder of Snyder common stock. In addition, the foregoing
summary does not address any non-income tax or any foreign, state or local tax
consequences of the merger nor does it address the tax consequences of any
transactions other than the merger or any aspect of the merger not involving
the exchange of Snyder common stock. Accordingly, each holder of Snyder common
stock is strongly urged to consult with such holder's tax advisor to determine
the particular United States federal, state, local or foreign income or other
tax consequences of the merger to such holder.
 
Regulatory Matters; Certain Legal Matters
 
   Under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, and the
rules promulgated thereunder by the Federal Trade Commission (referred to as
the FTC), the merger may not be consummated until the following steps have been
taken:
 
  . Premerger Notification and Report Forms have been submitted and certain
    information has been furnished to the FTC and the Antitrust Division of
    the United States Department of Justice; and
 
  . required waiting periods have expired or terminated.
 
   Santa Fe and Snyder have agreed, pursuant to the merger agreement, to use
reasonable efforts to file or cause to be filed with the FTC and the Antitrust
Division such notifications as are required to be filed under the Hart-Scott-
Rodino Antitrust Improvements Act and the rules and regulations promulgated
thereunder, and to respond to any requests for additional information made by
either the FTC or the Antitrust Division. Accordingly, Santa Fe and Snyder each
intend to file Premerger Notification and Report Forms with the FTC and the
Antitrust Division, on or before February 8, 1999. The statutory waiting period
would expire 30 days after such filing.
 
                                       51
<PAGE>
 
   At any time before or after the consummation of the merger and
notwithstanding the expiration or termination of the Hart-Scott-Rodino
Antitrust Improvements Act waiting period, any federal or state antitrust
authorities could take action under the antitrust laws as they deem necessary
or desirable in the public interest. Such action could include seeking to
enjoin the consummation of the merger or seeking divestiture of all or part of
the assets of Santa Fe or Snyder. Private parties may also seek to take legal
action under the antitrust laws, if circumstances permit.
 
   If the Antitrust Division, or any federal or state antitrust authority, were
to challenge the merger, the consummation of the merger could be postponed
beyond June 30, 1999, in which event, either Santa Fe or Snyder may terminate
the merger agreement, pursuant to its terms, at any time thereafter. See "The
Merger Agreement--Termination of the Merger Agreement" on page 62.
 
No Appraisal Rights
 
   Under the laws of the state of Delaware, which is the jurisdiction of
incorporation of both Snyder and Santa Fe, the common stockholders of Snyder
and Santa Fe are not entitled to appraisal rights with respect to the merger.
 
Federal Securities Laws Consequences; Resale Restrictions
 
   This document does not cover resales of the Santa Fe common stock to be
received by the stockholders of Snyder upon consummation of the merger, and no
person is authorized to make any use of this document in connection with any
such resale.
 
   All shares of Santa Fe common stock received by Snyder stockholders in the
merger will be freely transferable, except that shares of Santa Fe common stock
received by persons who are deemed to be "affiliates" as defined under the
Securities Act of 1933 of Snyder may be resold by them only in transactions
permitted by the resale provisions of Rule 145 (or Rule 144 in the case of such
persons who become affiliates of Santa Fe) or as otherwise permitted under the
Securities Act of 1933. Persons who may be deemed to be affiliates of Snyder or
Santa Fe generally include individuals or entities that control, are controlled
by, or are under common control with, such party and may include certain
officers and directors of Snyder or Santa Fe as well as significant
stockholders. The merger agreement requires Snyder to use its reasonable
efforts to cause each of its affiliates to execute a written agreement to the
effect that such persons will not offer or sell or otherwise dispose of any of
the shares of Santa Fe common stock issued to them in the merger in violation
of the Securities Act of 1933 or the rules and regulations promulgated by the
Securities and Exchange Commission thereunder.
 
                                       52
<PAGE>
 
          COMPARATIVE PER SHARE MARKET PRICE AND DIVIDEND INFORMATION
 
   The table below sets forth, for the calendar quarters indicated, the
reported high and low closing prices of Santa Fe common stock and Snyder common
stock as reported on the NYSE Composite Transaction Tape, in each case based on
published financial sources, and the dividends declared on such stock.
 
<TABLE>
<CAPTION>
                                Snyder Common Stock            Santa Fe Common Stock
                         ------------------------------- ------------------------------------
                            Market Price         Cash        Market Price             Cash
                         -----------------     Dividends --------------------      Dividends
                          High       Low       Declared   High         Low          Declared
                         ------     ------     --------- -------      -------      ----------
<S>                      <C>        <C>        <C>       <C>          <C>          <C>
1997
  First Quarter......... $  19 1/8  $  14 5/8   $0.065   $   15 7/8   $   12 1/2      $   --
  Second Quarter........     19        15 1/4    0.065       15 3/4       12 5/8          --
  Third Quarter (1).....    23 5/8     18 3/16   0.065       15 1/2        8 1/16         --
  Fourth Quarter........    24 7/8     16 3/4    0.065       14 1/16       9 7/8          --
 
1998
  First Quarter.........    21 7/16     15      $0.065   $   11 11/16 $    8 13/16        --
  Second Quarter........    22 1/2     17 3/8    0.065       11 9/16       9 3/8          --
  Third Quarter.........    21 1/4     14 9/16   0.065        11           6 27/32        --
  Fourth Quarter........    17 5/16    11 1/4    0.065        9 3/16       5 3/8          --
 
1999
  First Quarter (through
        , 1999).........
</TABLE>
- --------
(1) On July 25, 1997 Santa Fe distributed pro rata to its common stockholders
    all of the shares of Monterey Resources, Inc. that it owned by means of a
    tax-free distribution. The market price of Santa Fe's common stock declined
    to reflect the distribution of 0.44 common shares of Monterey for each
    common share of Santa Fe. Between the distribution date and November 4,
    1997, the date that Monterey's common shares were exchanged for shares of
    Texaco, Inc. pursuant to the merger agreement between the two companies,
    the market price of Monterey's common shares ranged from a low of $13.875
    to a high of $21.1875 in the third quarter of 1997 and ranged from a low of
    $19.9375 to a high of $21.5625 in the fourth quarter of 1997.
 
   Snyder and Santa Fe stockholders are urged to obtain current market
quotations prior to making any decision with respect to the merger.
 
                                       53
<PAGE>
 
           INTERESTS OF CERTAIN DIRECTORS AND OFFICERS IN THE MERGER
 
Snyder
 
   Snyder stockholders should note that a number of directors and executive
officers of Snyder have interests in the merger as employees and directors that
are different from, or in addition to, those of the Snyder stockholders, as
described below.
 
   Snyder Employment Agreement. Snyder has entered into an employment agreement
with William G. Hargett, which employment agreement will be replaced at the
effective time with a Santa Fe Snyder employment agreement. If within a period
of two years after the effective time, Santa Fe Snyder terminates Mr. Hargett's
employment other than for misconduct (as defined therein) or Mr. Hargett
terminates his employment for good reason (as defined therein), he would be
entitled to receive two years' compensation under his Santa Fe Snyder
employment agreement. For a description of the Santa Fe Snyder employment
agreement, see "--Santa Fe" beginning on page 55.
 
   Snyder Option Agreements. Stock options issued under Snyder's 1990 Stock
Plan for Non-Employee Directors and Amended and Restated 1989 Stock Option Plan
for employees would become fully vested and exercisable immediately prior to
the merger, but would be canceled upon consummation of the merger. As of
January 19, 1999, officers and directors of Snyder held a total of 1,386,522
shares of Snyder common stock subject to purchase pursuant to stock options
outstanding under such Snyder stock option plans that would become fully vested
and exercisable immediately prior to the merger, the weighted average exercise
price of which is $16.90 per share of Snyder common stock. The merger agreement
provides that at the effective time each Snyder stock option held by officers
continuing their employment with Santa Fe Snyder after the merger and by Snyder
directors would be replaced with options to purchase shares of Santa Fe Snyder
common stock in such number and at an exercise price based on the exchange
ratio and otherwise upon the same terms and conditions as are set forth in the
canceled Snyder stock options, except that the Santa Fe Snyder stock options
would be fully exercisable upon their grant.
 
   Snyder Change in Control Severance Agreements. Snyder has entered into
change in control severance agreements with each of its officers (other than
William G. Hargett whose employment agreement is discussed above). The merger
will constitute a "change in control" under the change in control severance
agreements. Any officer not offered employment with Santa Fe Snyder or who
terminates his employment because of a change in duties (as defined therein)
will be entitled to receive severance benefits equal to two years' salary under
his Snyder agreement.
 
   Notwithstanding the foregoing, the merger agreement provides that any
officer of Snyder who is offered employment with Santa Fe Snyder shall
surrender his Snyder change in control severance agreement in exchange for an
employment agreement with Santa Fe Snyder. The Santa Fe Snyder employment
agreement will contain severance and other terms (other than as to title and
compensation) available to similarly situated employees within Santa Fe Snyder.
For purposes of all such Santa Fe Snyder employment agreements, the merger
would constitute a "change in control." However, no employee would be entitled
to compensation and benefits under his Santa Fe employment agreement unless
within a period of two years after the effective time either Santa Fe
terminates the employee's employment other than for misconduct (as defined
therein) or the employee terminates his employment for good reason (as defined
therein). For a description of the Santa Fe Snyder employment agreement, see
"--Santa Fe" beginning on page 55.
 
   Certain Other Snyder Employee Benefit Plans. Several of the executive
officers and directors of Snyder participate in the Snyder Oil Corporation
Deferred Compensation Plan for Select Employees and the Snyder Oil Corporation
Directors Deferral Plan. For purposes of the Employee Deferral Plan, the merger
would constitute a "change in control" and employee benefits thereunder would
become immediately vested. The aggregate amount of deferred compensation
benefits accelerating for the benefit of all directors participating in
 
                                       54
<PAGE>
 
the Employee Deferral Plan is approximately $86,000. All benefits are vested
under the Director Deferral Plan and no acceleration of benefits accrues to
Snyder directors under the plan as a result of the merger.
 
Santa Fe
 
   Thirteen of Santa Fe's executives have employment agreements with Santa Fe
for which the merger will begin a two-year period during which the executive
will be entitled to receive severance benefits if his employment is terminated
either by Santa Fe for any reason other than for "misconduct" or by the
executive for a "good reason," as each such term is defined in the Santa Fe
employment agreements.
 
   Under the Santa Fe employment agreements, on a qualifying termination the
executive will be entitled to receive a lump sum payment equal to the sum of
 
  . two times the executive's annual base salary and
 
  . the maximum bonus payable to the executive that year under the annual
    bonus plan. However, Mr. Payne will be entitled to receive three times
    and Messrs. Boyt and Radtke two times the sum of their annual base salary
    and the greater of
 
     --their target bonus for that year and
 
     --their average bonus for the three preceding years.
 
In addition, Santa Fe will provide the executive with
 
  . continued welfare benefits in the form of life, health, accident and
    disability insurance for two years, and three years in the case of Mr.
    Payne,
 
  . outplacement services, and
 
  . cancel all stock-based awards granted to the executive after the merger
    by payment of a cash amount equal to the "spread" or fair market value of
    the award, as applicable.
 
   To the extent that any payments to these executives other than Mr. Payne,
whether under their employment agreement or otherwise, are subject to the
"golden parachute" excise tax imposed by Section 4999 of the Internal Revenue
Code, the amount payable pursuant to the employment agreement will be reduced
automatically if such reduction will avoid "golden parachute" tax consequences
and result in a greater net after-tax benefit to the executive than if no
reduction were made. If a golden parachute excise tax will be imposed with
respect to any payment made to Mr. Payne, he will be entitled to receive an
additional cash payment sufficient to make him "whole" on a net after-tax basis
for the excise tax and all taxes on the "make-whole" payment, including any
interest or penalties with respect thereto.
 
   In the event all executives with Santa Fe employment agreements were to be
terminated by Santa Fe other than for "misconduct" or were to resign with "good
reason" on the effective time, Santa Fe's aggregate additional liability under
the Santa Fe employment agreements based on December 31, 1998 compensation
levels without giving effect to the limitations described above is estimated to
be approximately $9.3 million.
 
   The merger will constitute a "change in control" for purposes of Santa Fe's
stock compensation plans, annual bonus plans and severance plan. As a result,
at the effective time:
 
  . all stock options held by Santa Fe employees and directors will become
    exercisable;
 
  . with respect to all shares of restricted stock held by Santa Fe employees
    and directors, all restrictions thereon will lapse;
 
  . all goals associated with phantom stock awards held by Santa Fe employees
    will be deemed met and such awards will become payable in cash; and
 
                                       55
<PAGE>
 
  . each participant in Santa Fe's incentive compensation plans who remains
    employed at year-end will be entitled to receive a cash bonus at the end
    of 1999 equal to the maximum bonus that would have been payable to the
    participant if all performance goals for 1999 had been met in full. The
    1999 bonus will be prorated for participants who terminate prior to year-
    end and is not payable to any executive who receives payments under his
    employment agreement for a qualifying termination in 1999.
 
   As of February 1, 1999, there were a total of
 
  . 1,533,588 shares of Santa Fe common stock subject to purchase pursuant to
    stock options of officers that will become fully exercisable upon
    consummation of the merger, the weighted average exercise price of which
    is $9.26 per share,
 
  . 188,322 shares of restricted stock held by officers, the restrictions on
    which will lapse upon consummation of the merger, and
 
  . 713,899 phantom units held by officers which will be paid upon
    consummation of the merger in cash in an amount equal to the aggregate
    value of the same number shares of Santa Fe common stock.
 
   Also, the Santa Fe board of directors has agreed to pay GKH Partners, L.P. a
fee for financial advisory services rendered to Santa Fe in connection with the
merger in the amount of $500,000 upon consummation of the merger. Melvyn N.
Klein, a director of Santa Fe, is the sole stockholder of a general partner of
GKH Partners, L.P. An affiliate of GKH Partners, L.P. owns approximately 5.1%
of Santa Fe's common stock and is party to a registration rights agreement with
Santa Fe.
 
                                       56
<PAGE>
 
                              THE MERGER AGREEMENT
 
   The description of the merger agreement set forth below describes all of the
material terms, but does not purport to describe all the terms, of the merger
agreement. The full text of the merger agreement is attached as Annex A to this
document and is incorporated by reference herein. You are urged to read the
merger agreement in its entirety.
 
Structure; Effective Time
 
   The merger agreement contemplates the merger of Snyder with and into Santa
Fe, with Santa Fe surviving the merger. The merger will become effective at the
time of the filing of a certificate of merger with the Secretary of State of
the State of Delaware (or such later time as agreed in writing by the parties
and specified in the certificate of merger), which is expected to occur as soon
as practicable after the last condition precedent to the merger set forth in
the merger agreement has been satisfied or waived.
 
Conversion or Cancellation of Shares of Snyder Common Stock in the Merger
 
   The merger agreement provides that each share of Snyder common stock
outstanding immediately prior to the effective time (except as described in the
following sentence) will, at the effective time, be converted into 2.05 shares
of Santa Fe common stock (see "The Merger--General"). All shares of Snyder
common stock that are owned by Snyder as treasury stock and any shares of
Snyder common stock owned by Santa Fe or any subsidiary of Santa Fe will, at
the effective time, be canceled and no payment will be made for such shares.
 
Santa Fe Snyder Board of Directors and Board Committees
 
   The merger agreement provides that immediately after the effective time
Santa Fe shall take such action as shall be required to cause the Santa Fe
board of directors to increase to eleven members, divided into three classes.
In accordance with the merger agreement, on      , 1999 the Santa Fe board
nominated      ,      ,      ,       and       (such individuals being
designated by the Snyder board as contemplated in the merger agreement) to
stand for election as directors of Santa Fe at the Santa Fe special meeting.
 
   The Santa Fe board of directors unanimously recommends that the Santa Fe
stockholders vote for each of such individuals to be members of the Santa Fe
Snyder board of directors, commencing immediately after the merger. For a
description of each such nominee's background and the class of Santa Fe
Snyder's board of directors for which they have been nominated, see "Election
of Directors" on page 78. Immediately after the effective time, John C. Snyder
shall be the chairman of the board of directors of Santa Fe Snyder and the
persons listed under "Directors and Officers of Santa Fe Snyder Following the
Merger" on page 69 will be named as the senior executive officers of Santa Fe
Snyder.
 
   Under the merger agreement we have agreed that Santa Fe Snyder will have a
nominating committee consisting of Messrs. Snyder, Payne and two additional
members of the board of directors, one of which will be designated by Mr.
Snyder and the other by Mr. Payne.
 
Employee Stock Options
 
   At the effective time, each option to purchase shares of Snyder common stock
outstanding under any employee stock option or compensation plan or arrangement
of Snyder, whether or not vested or exercisable, shall be canceled. All holders
of Snyder options to be canceled in the merger other than Snyder employees
receiving severance will each be entitled to receive from Santa Fe replacement
options to purchase common stock of Santa Fe Snyder on terms comparable to
those of the canceled Snyder options. The number of shares of common stock of
Santa Fe Snyder subject to such option and the exercise price thereunder shall
be computed in compliance with the requirements of Section 424(a) of the
Internal Revenue Code. Snyder has agreed that it will, prior to the effective
time, use all commercially reasonable efforts to obtain such consents, if any,
and take any such other permitted action, if any, as may be necessary to give
effect to the transactions contemplated by this paragraph. Except as
contemplated by this paragraph, Snyder has agreed that it will not, without the
written consent of Santa Fe, amend any outstanding options to purchase shares
of Snyder common stock (including accelerating the vesting thereof).
 
                                       57
<PAGE>
 
Conversion of Shares
 
   Prior to the effective time, Santa Fe will appoint an exchange agent for the
purpose of exchanging certificates representing shares of Snyder common stock
for the shares of Santa Fe common stock to be issued in exchange for the Snyder
common stock,which Santa Fe will make available to the exchange agent. Promptly
after the effective time, Santa Fe or the exchange agent will send each holder
of Snyder common stock a letter of transmittal for use in the exchange and
instructions explaining how to surrender certificates to the exchange agent.
Holders of Snyder common stock who surrender their certificates to the exchange
agent, together with a properly completed letter of transmittal, will receive
2.05 shares of Santa Fe common stock for each surrendered share of Snyder
common stock. Holders of unexchanged shares of Snyder common stock will not be
entitled to receive any dividends or other distributions payable by Santa Fe
after the effective time until their certificates are surrendered. Upon
surrender, however, such holders will receive accumulated dividends and
distributions payable on the related shares of Santa Fe common stock subsequent
to the effective time, without interest, together with (if applicable) cash in
lieu of fractional shares of Santa Fe common stock (paid as described in the
following sentence). Holders of Snyder common stock will receive a check in the
amount of the net proceeds from the sale of fractional shares of Santa Fe
common stock in the market by the exchange agent.
 
Conduct of Business Prior to Merger
 
   From the date of the execution of the merger agreement until the effective
time, Snyder and its subsidiaries and Santa Fe and its subsidiaries are
required to conduct their business only in the ordinary course consistent with
past practice and oil field practices standard in the industry and to use their
reasonable best efforts to preserve intact their business organizations and
relationships with third parties and to keep available the services of their
officers and employees. In particular, except as otherwise provided in the
merger agreement, during this period, Snyder may not, without Santa Fe's prior
written consent, and Santa Fe may not, without Snyder's prior written consent:
 
  . settle any material tax audit, make or change any material tax election,
    or file any material amended tax return,
 
  . issue any securities, amend the terms of any of its outstanding
    securities, incur indebtedness outside the ordinary course of business,
    fail to make a required contribution to an employee benefit plan,
    increase the compensation payable or modify the employment or severance
    agreements with any executive officer or former employee or enter into
    any settlement of litigation outside the ordinary course of business,
 
  . change any of its accounting policies (except for any such change
    required by GAAP),
 
  . take any action giving rise to a claim under the Worker Adjustment and
    Retraining Notification Act or any similar state laws or regulation,
 
  . amend any engagement letter with its financial advisor(s) or
 
  . agree or commit to any of the foregoing.
 
   In addition, during this period, except as provided for in the merger
agreement, neither Snyder nor any of its subsidiaries may, without Santa Fe's
prior written consent, and neither Santa Fe nor any of its subsidiaries may,
without Snyder's prior written consent:
 
  . adopt any amendments to its organizational documents,
 
  . enter into any mergers or consolidations exceeding $10 million
    individually or $30 million in the aggregate,
 
  . pay dividends other than Snyder's regular dividend or intercompany
    dividends or repurchase, redeem or otherwise acquire any of its or its
    subsidiaries' outstanding stock other than intercompany acquisitions of
    capital stock,
 
                                       58
<PAGE>
 
  . become bound to participate in any operation with respect to oil and gas
    interests that will cost in excess of $10 million individually or $50
    million in the aggregate (unless the operation is a currently existing
    obligation of such company),
 
  . enter into certain hedging transactions not in accordance with such
    company's hedging policy,
 
  . sell, lease or otherwise dispose of or create a lien on any of its
    material assets outside its ordinary course of business (other than
    pursuant to existing contracts or commitments),
 
  . take, commit to take or fail to take any action that would cause a
    representation or warranty made in the merger agreement to be inaccurate
    or
 
  . agree or commit to any of the foregoing.
 
Covenants and Agreements
 
   Special Meetings; Proxy Material. Santa Fe and Snyder have agreed to cause
the special meetings of their stockholders to be duly called and held as
promptly as practicable for the purpose of voting on the approval and adoption
of the merger agreement, and, in the case of Santa Fe, the election of
directors, as discussed herein.
 
   No Solicitation. The merger agreement provides that until it is terminated,
Santa Fe and Snyder and their respective subsidiaries will not, and will not
cause their respective officers, directors, employees or other agents to,
directly or indirectly, take any action to solicit, initiate or encourage any
acquisition proposal (as defined below) or engage in negotiations with, or
disclose any nonpublic information relating to Santa Fe or Snyder or their
respective subsidiaries, or afford access to their respective properties, books
or records to any person that has made or may be considering making an
acquisition proposal. However, Santa Fe and Snyder and their respective boards
are permitted to take and disclose a position with respect to a tender offer by
a third party pursuant to Rules 14d-9 and 14e-2(a) promulgated by the
Securities and Exchange Commission under the Securities Exchange Act of 1934.
In addition, Santa Fe and Snyder and their respective boards may furnish
information to or enter into negotiations with, any person or entity that has
indicated its willingness to make an unsolicited bona fide proposal to acquire
Santa Fe or Snyder, as the case may be, pursuant to a merger, consolidation,
share exchange, purchase of a substantial portion of the assets, business
combination or similar transaction, or withdraw, modify or change their
recommendation of the merger agreement or the merger or recommend an
acquisition proposal which is a superior acquisition proposal (as defined
below), if, and only to the extent that:
 
  . the Santa Fe or Snyder board, as the case may be, after considering the
    written advice of outside legal counsel, determines in good faith that
    such action is required for the board to comply with its fiduciary duties
    to stockholders imposed by applicable law;
 
  . contemporaneously with furnishing such information to, or entering into
    discussions or negotiations with, such person or entity either Santa Fe
    or Snyder, as the case may be, provides written notice to the other party
    to the effect that it is furnishing information to, or entering into
    discussions or negotiations with, such person or entity; and
 
  . Santa Fe or Snyder, as the case may be, uses all reasonable efforts to
    keep the other party informed in all material respects of the status and
    terms of any such negotiations or discussions (including the identity of
    the person or entity with whom such negotiations or discussions are being
    held) and provides the other party with copies of such written proposals
    and any amendments or revisions thereto or correspondence related
    thereto.
 
   The merger agreement defines the term "acquisition proposal" to mean any
offer or proposal for, or any indication of interest in, a merger or other
business combination directly or indirectly involving Santa Fe or Snyder or any
of their respective subsidiaries or the acquisition of a substantial equity
interest in, or a substantial portion of the assets of, any such party, other
than the transactions contemplated by the merger
 
                                       59
<PAGE>
 
agreement. The merger agreement defines the term "superior acquisition
proposal" to mean a bona fide written acquisition proposal which the board of
directors concludes in good faith after consultation with its financial
advisors and legal counsel, taking into account all legal, financial,
regulatory and other aspects of the proposal and the person making the
proposal,
 
  . would, if consummated, result in a transaction that is more favorable to
    their company's stockholders from a strategic and financial point of
    view, than the transactions contemplated by the merger agreement and
 
  . is reasonably capable of being completed.
 
   Reasonable Commercial Efforts. Each party has agreed to use all reasonable
commercial efforts to take, or cause to be taken, all actions and to do, or
cause to be done, all things necessary, proper or advisable under applicable
laws and regulations to consummate the transactions contemplated by the merger
agreement.
 
   Certain Employee Benefits Matters. The merger agreement provides that, as
soon as reasonably practicable on or after the effective time, Santa Fe Snyder
will establish compensation and employee benefit plan programs for the
continuing employees of Santa Fe Snyder that provide similarly situated
employees with compensation and benefits on substantially the same basis, to
the extent reasonably practicable. Until such programs are established, Santa
Fe Snyder shall provide that the continuing employees shall be eligible to
continue to participate in the respective employee benefit plans of Santa Fe
and Snyder, or shall be eligible to participate in any combination of such
plans or new plans as Santa Fe Snyder deems appropriate. The employees of
Snyder shall be given credit for their service with Snyder prior to the
effective time for all purposes under the compensation and employee benefit
plans of Santa Fe Snyder, other than the accrual of benefits under any defined
benefit plan. However, any member of the senior management of Snyder who
continues employment with Santa Fe Snyder who is receiving compensation and
benefits immediately prior to the effective time in excess of that being
received at that time by similarly situated Santa Fe employees shall continue
to receive such level of compensation and benefits, but shall not be eligible
for upward compensation and benefits adjustments until the compensation and
benefits of such former member of Snyder's senior management are in the
aggregate equal to that received by a similarly situated Santa Fe employee.
 
   Following the effective time, most former Snyder employees who are employed
by Santa Fe Snyder will be eligible for grants commensurate with grants
provided to similarly situated Santa Fe employees under the applicable stock
option plans maintained by Santa Fe Snyder. In addition, most persons who were
employees of Snyder immediately prior to the effective time who become
employees of Santa Fe Snyder will receive an annual grant of stock options
during the summer of 1999 on terms as established by the past practices of
Santa Fe and commensurate with grants usually provided to similarly situated
Santa Fe employees subject to the availability of shares under the applicable
stock option plans of Santa Fe Snyder.
 
   Indemnification and Insurance of Snyder Officers and Directors. Santa Fe has
agreed that for six years after the effective time, it will indemnify and hold
harmless the present and former directors and officers of Snyder, and any
Snyder employee who acts as a fiduciary under any of the Snyder employee
benefit plans, to the extent provided by the Delaware General Corporation Law
and Snyder's certificate of incorporation and bylaws in effect at the effective
time, against certain liabilities. Santa Fe also agreed to maintain Snyder's
officers' and directors' liability insurance policy, or to purchase a "tail"
policy thereunder, for a period of at least six years after the effective time,
provided that the aggregate amount of premiums paid for such insurance during
this period shall not exceed $500,000.
 
   Certain Other Covenants. The merger agreement contains certain mutual
covenants of the parties, including covenants relating to: actions to be taken
so as not to jeopardize the intended tax treatment of the merger; public
announcements; preparation of this document; notification of certain matters;
access to information; further assurances; cooperation in connection with
certain governmental filings and in obtaining consents and approvals; the
listing of the Santa Fe common stock to be issued in conjunction with the
merger; and confidential treatment of non-public information.
 
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<PAGE>
 
Certain Representations and Warranties
 
   The merger agreement contains substantially reciprocal representations and
warranties of Snyder and Santa Fe as to various matters.
 
   In addition, the merger agreement contains representations and warranties of
Snyder and Santa Fe that neither Section 203 of the Delaware General
Corporation Law nor any other antitakeover or similar statute or regulation
applies or purports to apply to the transactions contemplated by the merger
agreement, and that both Santa Fe and Snyder have taken all action necessary to
render the rights issued pursuant to the terms of their respective rights
agreements inapplicable to the merger agreement and the transactions
contemplated therein.
 
   The merger agreement defines the term "material adverse effect" to mean any
event, circumstance, condition, development or occurrence causing, resulting in
or having a material adverse effect on the financial condition, business,
operations, assets, properties, prospects or results of operations of Santa Fe
or its subsidiaries, taken as a whole, or Snyder and its subsidiaries, taken as
a whole, as the case may be; provided, that such term shall not include effects
on Santa Fe or Snyder resulting from general economic conditions or from market
conditions (including, without limitation, changes in the market prices for oil
and gas) then prevailing generally in the oil and gas industry. Many of the
representations and warranties in the merger agreement are qualified by the
absence of a material adverse effect.
 
   The representations and warranties in the merger agreement do not survive
the effective time.
 
Conditions to the Merger
 
   Conditions to the Obligations of Each Party. The obligations of Santa Fe and
Snyder to consummate the merger are subject to the satisfaction of the
following conditions:
 
  . the merger agreement shall have been approved by the requisite vote of
    the stockholders of Santa Fe and Snyder;
 
  . any applicable waiting period under the Hart-Scott-Rodino Antitrust
    Improvements Act of 1976 relating to the merger shall have expired or
    been terminated;
 
  . the absence of any statute, regulation, judgment, injunction, order or
    decree that would prohibit the consummation of the merger;
 
  . the registration statement to register the shares of Santa Fe common
    stock to be issued in the merger shall have been filed by Santa Fe with
    the Securities and Exchange Commission and been declared effective and no
    stop order suspending the effectiveness of the registration statement
    shall be in effect and no proceedings for such purpose shall be pending
    before or threatened by the Securities and Exchange Commission; and
 
  . the shares of Santa Fe common stock to be issued in the merger shall have
    been approved for listing on the NYSE, subject to official notice of
    issuance.
 
   Conditions to the Obligations of Santa Fe. The obligation of Santa Fe to
consummate the merger is further subject to the satisfaction of the following
conditions:
 
  . Snyder shall have performed in all material respects the obligations
    required to be performed by it at or prior to the effective time and each
    of the representations and warranties contained in the merger agreement
    that is qualified as to materiality shall be true and correct in all
    respects and each of the representations not so qualified shall be true
    and correct in all material respects as of the effective time as if made
    at such time (except that the accuracy of representations and warranties
    that by their terms speak as of a specified date other than as of the
    date of the merger agreement will be determined as of such specified
    date), and Santa Fe shall have received a certificate signed by an
    executive officer of Snyder to the foregoing effect;
 
                                       61
<PAGE>
 
  . all proceedings to be taken by Snyder in connection with the transactions
    contemplated by the merger agreement and all documents, instruments and
    certificates to be delivered by Snyder in connection with such
    transactions will be reasonably satisfactory in form and substance to
    Santa Fe and its counsel; and
 
  . Santa Fe shall have received an opinion from Andrews & Kurth L.L.P. that
 
     --the merger shall constitute a reorganization under Section 368(a) of
  the Internal Revenue Code;
 
     --Santa Fe and Snyder will each be a party to that reorganization; and
 
     --no gain or loss will be recognized by Santa Fe or Snyder by reason of
  the merger.
 
   Conditions to the Obligations of Snyder. The obligation of Snyder to
consummate the merger is further subject to the satisfaction of the following
conditions:
 
  . Santa Fe shall have performed in all material respects the obligations
    required to be performed by it at or prior to the effective time and each
    of the representations and warranties contained in the merger agreement
    that is qualified as to materiality shall be true and correct in all
    respects and each of the representations not so qualified shall be true
    and correct in all material respects as of the effective time as if made
    at such time (except that the accuracy of representations and warranties
    that by their terms speak as of a specified date other than as of the
    date of the merger agreement will be determined as of such specified
    date), and Snyder shall have received a certificate signed by an
    executive officer of Santa Fe to the foregoing effect;
 
  . all proceedings to be taken by Santa Fe in connection with the
    transactions contemplated by the merger agreement and all documents,
    instruments and certificates to be delivered by Santa Fe in connection
    with such transactions will be reasonably satisfactory in form and
    substance to Snyder and its counsel; and
 
  . Snyder shall have received an opinion from Vinson & Elkins L.L.P. that
 
     --the merger shall constitute a reorganization under Section 368(a) of
  the Internal Revenue Code;
 
     --Santa Fe and Snyder will each be a party to that reorganization;
 
     --no gain or loss will be recognized by Snyder by reason of the merger;
  and
 
    --no gain or loss will be recognized by holders of Snyder common stock
     by reason of the merger upon the conversion of shares of Snyder common
     stock into Santa Fe common stock, except with respect to cash received
     in lieu of fractional shares.
 
Termination of the Merger Agreement
 
   Right to Terminate. The merger agreement may be terminated at any time prior
to the effective time, whether before or after approval by the boards of
directors or stockholders of Snyder or Santa Fe:
 
  . by the mutual written consent of Snyder and Santa Fe;
 
  . by either Snyder or Santa Fe if the effective time has not occurred on or
    before June 30, 1999; provided, that this right to terminate the merger
    agreement shall not be available to any party whose breach of any of its
    covenants or agreements under the merger agreement results in the failure
    of the merger to be consummated by June 30, 1999;
 
  . by either Snyder or Santa Fe if there is any applicable law, rule or
    regulation that makes consummation of the merger illegal or otherwise
    prohibited or if any final and non-appealable judgment, injunction, order
    or decree enjoining any party from consummating the merger is entered;
 
  . by either Snyder or Santa Fe if the requisite stockholder approval is not
    obtained by a vote at a duly held meeting of stockholders or at any
    adjournment or postponement thereof;
 
 
                                       62
<PAGE>
 
  . by Snyder, if Santa Fe is in material breach of the merger agreement and
    such breach is not cured in all material respects within 20 business days
    after notice of such breach;
 
  . by Santa Fe, if Snyder is in material breach of the merger agreement and
    such breach is not cured in all material respects within 20 business days
    after notice of such breach;
 
  . by Snyder, if the Santa Fe board withdraws, modifies or changes its
    recommendation of the merger agreement or the merger in a manner adverse
    to Snyder or the Santa Fe board recommends to the stockholders of Santa
    Fe any acquisition proposal or resolves to do any of the foregoing or a
    tender offer or exchange offer for outstanding shares of capital stock of
    Santa Fe representing 50% or more of the combined power to vote generally
    for the election of directors is commenced, and the Santa Fe board does
    not, within the applicable period required by law, recommend that
    stockholders not tender their shares into such tender or exchange offer;
 
  . by Santa Fe, if the Snyder board withdraws, modifies or changes its
    recommendation of the merger agreement or the merger in a manner adverse
    to Santa Fe or the Snyder board recommends to the stockholders of Snyder
    any acquisition proposal or resolves to do any of the foregoing or a
    tender offer or exchange offer for outstanding shares of capital stock of
    Snyder representing 50% or more of the combined power to vote generally
    for the election of directors is commenced, and the Snyder board does
    not, within the applicable period required by law, recommend that
    stockholders not tender their shares into such tender or exchange offer;
 
  . by Snyder or Santa Fe, if Snyder accepts a bona fide written acquisition
    proposal which the board of directors of Snyder concludes in good faith
    is a superior acquisition proposal and pays the applicable termination
    fee to Santa Fe; or
 
  . by Santa Fe or Snyder, if Santa Fe accepts a bona fide written
    acquisition proposal which the board of directors of Santa Fe concludes
    in good faith is a superior acquisition proposal and pays the applicable
    termination fee to Snyder.
 
 
   If the merger agreement is validly terminated, no provision thereof shall
survive (except for, among others, provisions relating to confidentiality,
termination fees and expenses, public announcements, information supplied for
use in this document, the right to participate in the defense of stockholder
lawsuits, notices, governing law, jurisdiction and waiver of a jury trial) and
such termination shall be without any liability on the part of any party,
unless such party is in willful, reckless, or grossly negligent breach of any
provision of the merger agreement. The confidentiality agreement entered into
between Santa Fe and Snyder on December 16, 1998 will continue in effect
notwithstanding termination of the merger agreement.
 
Termination Expenses
 
   The merger agreement provides that, except as provided below, all expenses
incurred by the parties to the merger agreement shall be borne solely and
entirely by the party that has incurred such expenses. If the merger agreement
is terminated for any reason, Santa Fe or Snyder will share equally in all
expenses (excluding all reasonable fees and expenses of counsel, accountants,
investment bankers, experts and consultants) incurred by a party related to the
preparation, printing, filing and mailing of this document, and all SEC and
other regulatory filing fees incurred in connection with the registration
statement regarding the issuance of Santa Fe common stock, this document and
the Hart-Scott-Rodino Antitrust Improvements Act of 1976.
 
   Snyder Termination Expenses. The merger agreement generally provides that
Snyder shall pay Santa Fe a termination fee of $25 million, plus Santa Fe's
reasonable out-of-pocket expenses, if the merger agreement is terminated in the
following circumstances:
 
  . Snyder stockholder approval is not obtained;
 
  . the Snyder board withdraws, modifies or changes its recommendation of the
    merger agreement or the merger in a manner adverse to Santa Fe,
    recommends to the stockholders of Snyder any acquisition proposal for
    Snyder or does not recommend that the stockholders do not tender or
    exchange their
 
                                       63
<PAGE>
 
    shares pursuant to a tender offer or exchange offer for Snyder capital
    stock representing 50% or more of the power to vote generally for the
    election of directors;
 
  . Snyder accepts a superior proposal; or
 
  . in the event of a material breach of any covenant or agreement in the
    merger agreement by Snyder.
 
   If the merger agreement is terminated in the manner set forth in the second
and third bullet points above, Snyder will be obligated to pay Santa Fe the
termination fee and Santa Fe's reasonable expenses without any further
requirements or pre-conditions to the payment obligation. If, however, the
merger agreement is terminated in the manner set forth in either the first or
fourth bullet points above, Snyder will be obligated to pay Santa Fe's
reasonable expenses, but will only be obligated to pay Santa Fe the
termination fee if within nine months after such termination Snyder accepts a
written offer with respect to, or enters into a written agreement to
consummate or consummates, a transaction which, if offered or proposed, would
constitute an acquisition proposal.
 
   Santa Fe Termination Expenses. The merger agreement generally provides that
Santa Fe shall pay Snyder a termination fee of $25 million, plus Snyder's
reasonable out-of-pocket expenses, if the merger agreement is terminated in
the following circumstances:
 
  . Santa Fe stockholder approval is not obtained;
 
  . the Santa Fe board withdraws, modifies or changes its recommendation of
    the merger agreement or the merger in a manner adverse to Snyder,
    recommends to the stockholders of Santa Fe any acquisition proposal for
    Santa Fe or does not recommend that the stockholders do not tender or
    exchange their shares pursuant to a tender offer or exchange offer for
    Santa Fe capital stock representing 50% or more of the power to vote
    generally for the election of directors;
 
  . Santa Fe accepts a superior proposal; or
 
  . in the event of a material breach of any covenant or agreement in the
    merger agreement by Santa Fe.
 
   If the merger agreement is terminated in the manner set forth in the second
and third bullet points above, Santa Fe will be obligated to pay Snyder the
termination fee and Snyder's reasonable expenses without any further
requirements or pre-conditions to the payment obligation. If, however, the
merger agreement is terminated in the manner set forth in either the first or
fourth bullet points above, Santa Fe will be obligated to pay Snyder's
reasonable expenses but will only be obligated to pay Snyder the termination
fee if within nine months after such termination Santa Fe accepts a written
offer with respect to, or enters into a written agreement to consummate or
consummates, a transaction which if offered or proposed, would constitute an
acquisition proposal.
 
Amendments; No Waivers
 
   Any provision of the merger agreement may be amended or waived prior to the
effective time only if the amendment or waiver is in writing and signed, in
the case of any amendment, by Santa Fe and Snyder, or, in the case of a
waiver, by the party against whom the waiver is to be effective; provided,
that
 
  . after the approval of the merger agreement by the stockholders of Snyder,
    no amendment or waiver shall, without the further approval of the Snyder
    stockholders, reduce the amount or change the kind of consideration to be
    received in exchange for any shares of capital stock of Snyder, and
 
  . after the approval of the merger agreement by the stockholders of Santa
    Fe, no amendment or waiver shall, without the further approval of the
    Santa Fe stockholders, modify or change the exchange ratio of 2.05 shares
    of Santa Fe common stock per share of Snyder common stock in a manner
    adverse to the Santa Fe stockholders.
 
                                      64
<PAGE>
 
                             SNYDER SPECIAL MEETING
 
   This document is furnished in connection with the solicitation of proxies
from the holders of Snyder common stock by the Snyder board for use at the
Snyder special meeting. This document and accompanying form of proxy are first
being mailed to the stockholders of Snyder on or about      , 1999.
 
Time and Place; Purpose
 
   The Snyder special meeting will be held at [TIME], local time, on [DATE] at
[LOCATION], [ADDRESS], Texas. At the Snyder special meeting (and any
adjournment or postponement thereof), the stockholders of Snyder will be asked
to consider and vote upon the approval and adoption of the merger agreement and
the merger and such other matters as may properly come before the Snyder
special meeting.
 
   Snyder stockholder approval and adoption of the merger and the merger
agreement is required by the Delaware General Corporation Law.
 
   The Snyder board has unanimously approved the terms of the merger agreement
and the consummation of the merger contemplated thereby, unanimously believes
that the terms of the merger and the merger agreement are fair to, and in the
best interests of, Snyder and its stockholders, and unanimously recommends that
holders of Snyder common stock vote "for" approval and adoption of the merger
and the merger agreement.
 
   One or more representatives of Petrie Parkman are expected to be present at
the special meeting to answer appropriate questions of stockholders of Snyder
and to make a statement if so desired.
 
Record Date; Voting Rights and Proxies
 
   Only holders of record of Snyder common stock at the close of business on
     , 1999 (the "Snyder Record Date") are entitled to notice of and to vote at
the Snyder special meeting. As of the Snyder Record Date, there were    shares
of Snyder common stock outstanding, each of which entitled the holder thereof
to one vote. There were approximately    holders of record on the Snyder Record
Date.
 
   All shares of Snyder common stock represented by properly executed proxies
will, unless such proxies have been previously revoked, be voted in accordance
with the instructions indicated in such proxies. If no instructions are
indicated, such shares of Snyder common stock will be voted "for" approval and
adoption of the merger and the merger agreement. Snyder does not know of any
matters other than the approval of the merger and the merger agreement that are
to come before the Snyder special meeting. If any other matter or matters are
properly presented for action at the Snyder special meeting, the persons named
in the enclosed form of proxy and acting thereunder will have the discretion to
vote on such matters in accordance with their best judgment. A stockholder who
has given a proxy may revoke it at any time prior to its exercise by giving
written notice of revocation to Snyder by signing and returning a later dated
proxy, or by voting in person at the Snyder special meeting. Votes cast by
proxy or in person at the Snyder special meeting will be tabulated by the
inspector of election appointed for the meeting.
 
Solicitation of Proxies
 
   Proxies are being solicited by and on behalf of the Snyder board. In
addition to solicitation by use of the mails, proxies may be solicited by
directors, officers and employees of Snyder in person or by telephone, telegram
or other means of communication. Such directors, officers and employees will
not be additionally compensated, but may be reimbursed for out-of-pocket
expenses incurred in connection with such solicitation. Arrangements have also
been made with brokerage firms, banks, custodians, nominees and fiduciaries for
the forwarding of proxy solicitation materials to owners of Snyder common stock
held of record by such persons and in connection therewith such firms will be
reimbursed for reasonable expenses incurred in forwarding such
 
                                       65
<PAGE>
 
materials. Snyder and Santa Fe have retained     to assist in the solicitation
of proxies from Snyder's and Santa Fe's stockholders. The total fees and
expenses of      are estimated to aggregate $   and will be shared by Snyder
and Santa Fe.
 
   Snyder stockholders should not send any certificates representing Snyder
common stock with their proxy cards. Following the effective time, Snyder
stockholders will receive instructions for the surrender and exchange of such
stock certificates.
 
Quorum
 
   The presence in person or by properly executed proxy of a majority of the
issued and outstanding shares of Snyder common stock entitled to vote is
necessary to constitute a quorum at the Snyder special meeting.
 
Required Vote, Failure to Vote and Broker Non-Votes
 
   Approval and adoption of the merger and the merger agreement requires the
affirmative vote of a majority of the outstanding shares of Snyder common
stock. On      , 1999, Snyder directors and executive officers owned and were
entitled to vote    shares of Snyder common stock, or approximately  % of the
shares of Snyder common stock outstanding on that date. The Snyder directors
and executive officers have agreed to vote their shares of Snyder common stock
"for" approval of the merger agreement.
 
   Any failure to vote, or a vote to abstain, will have the effect of a vote
against the merger and the merger agreement.
 
   Under NYSE rules, brokers who hold shares in street name for customers have
the authority to vote on certain "routine" proposals when they have not
received instructions from beneficial owners. However, such brokers are
precluded from exercising their voting discretion with respect to the approval
and adoption of non-routine matters such as the merger and the merger agreement
and, thus, absent specific instructions from the beneficial owner of such
shares, brokers are not empowered to vote such shares with respect to the
merger and the merger agreement. These "broker non-votes" will therefore have
the effect of a vote against the merger and the merger agreement.
 
                                       66
<PAGE>
 
                            SANTA FE SPECIAL MEETING
 
   This document is furnished in connection with the solicitation of proxies
from the holders of Santa Fe common stock by the Santa Fe board for use at the
Santa Fe special meeting. This document and accompanying form of proxy are
first being mailed to the stockholders of Santa Fe on or about      , 1999.
 
Time and Place; Purpose
 
   The Santa Fe special meeting will be held at [TIME], local time, on [DATE]
at [LOCATION], [ADDRESS], Texas. At the Santa Fe special meeting and any
adjournment or postponement thereof, the stockholders of Santa Fe will be asked
to consider and vote upon
 
  . the approval and adoption of the merger agreement and the merger,
    including the issuance of Santa Fe common stock in the merger, the change
    in the company's name to "Santa Fe Snyder Corporation" and the increase
    in the authorized shares of common stock to 300,000,000 shares of common
    stock of Santa Fe Snyder;
 
  . subject to the consummation of the merger, the election of five persons
    to serve as additional directors of Santa Fe Snyder commencing
    immediately after the merger; and
 
  . such other matters as may properly come before the Santa Fe special
    meeting.
 
   Santa Fe stockholder approval and adoption of the merger and the merger
agreement and the related issuance of shares of Santa Fe common stock is
required by the Delaware General Corporation Law and the rules of the NYSE.
 
   The Santa Fe board has unanimously approved the terms of the merger
agreement, the consummation of the merger contemplated thereby and the issuance
of Santa Fe common stock, unanimously believes that the terms of the merger and
the merger agreement are fair to, and in the best interests of, Santa Fe and
its stockholders, and unanimously recommends that holders of Santa Fe common
stock vote "for" approval and adoption of the merger, the merger agreement and
the issuance of Santa Fe common stock pursuant to the merger agreement. The
Santa Fe board also unanimously recommends that the holders of Santa Fe common
stock vote, subject to the consummation of the merger, "for" the election of
each of the five Snyder nominees to Santa Fe Snyder's board of directors.
 
   One or more representatives of each of DLJ and Chase are expected to be
present at the special meeting to answer appropriate questions of stockholders
of Santa Fe and to make a statement if so desired.
 
Record Date; Voting Rights and Proxies
 
   Only holders of record of Santa Fe common stock at the close of business on
     , 1999 (the "Santa Fe Record Date") are entitled to notice of and to vote
at the Santa Fe special meeting. As of the Santa Fe Record Date, there were
shares of Santa Fe common stock outstanding, each of which entitled the holder
thereof to one vote. There were approximately    holders of record on the Santa
Fe Record Date.
 
   All shares of Santa Fe common stock represented by properly executed proxies
will, unless such proxies have been previously revoked, be voted in accordance
with the instructions indicated in such proxies. If no instructions are
indicated, such shares of Santa Fe common stock will be voted "for" approval
and adoption of the merger and the merger agreement and the issuance of Santa
Fe common stock in the merger and "for" approval of each of the five nominees
to Santa Fe Snyder's board of directors. Santa Fe does not know of any matters
other than the approval of the merger and the merger agreement, the issuance of
Santa Fe common stock in the merger and the election of directors to fill the
vacancies on Santa Fe Snyder's board of directors that are to come before the
Santa Fe special meeting. If any other matter or matters are properly presented
for action at the Santa Fe special meeting, the persons named in the enclosed
form of proxy and acting thereunder
 
                                       67
<PAGE>
 
will have the discretion to vote on such matters in accordance with their best
judgment. A stockholder who has given a proxy may revoke it at any time prior
to its exercise by giving written notice of revocation to Santa Fe by signing
and returning a later dated proxy, or by voting in person at the Santa Fe
special meeting. Votes cast by proxy or in person at the Santa Fe special
meeting will be tabulated by the inspector of election appointed for the
meeting.
 
Solicitation of Proxies
 
   Proxies are being solicited by and on behalf of the Santa Fe board. In
addition to solicitation by use of the mails, proxies may be solicited by
directors, officers and employees of Santa Fe in person or by telephone,
telegram or other means of communication. Such directors, officers and
employees will not be additionally compensated, but may be reimbursed for out-
of-pocket expenses incurred in connection with such solicitation. Arrangements
have also been made with brokerage firms, banks, custodians, nominees and
fiduciaries for the forwarding of proxy solicitation materials to owners of
Santa Fe common stock held of record by such persons and in connection
therewith such firms will be reimbursed for reasonable expenses incurred in
forwarding such materials. Santa Fe and Snyder have retained      to assist in
the solicitation of proxies from Santa Fe's and Snyder's stockholders. The
total fees and expenses of      are estimated to aggregate $    and will be
shared by Santa Fe and Snyder.
 
Quorum
 
   The presence in person or by properly executed proxy of a majority of the
issued and outstanding shares of Santa Fe common stock entitled to vote is
necessary to constitute a quorum at the Santa Fe special meeting.
 
Required Vote, Failure to Vote and Broker Non-Votes
 
   Approval and adoption of the merger and the merger agreement and the
issuance of Santa Fe common stock in the merger requires the affirmative vote
of a majority of the outstanding shares of Santa Fe common stock. The election
of each of the five Snyder nominees requires a plurality of the votes cast by
the shares entitled to vote in the election at a meeting at which a quorum is
present. On      , 1999, Santa Fe directors and executive officers owned and
were entitled to vote    shares of Santa Fe common stock, or approximately   %
of the shares of Santa Fe common stock outstanding on that date. The Santa Fe
directors and executive officers have agreed to vote their shares of Santa Fe
common stock "for" approval of the merger agreement and the issuance of Santa
Fe common stock in the merger and "for" each of the five nominees as directors
of Santa Fe Snyder.
 
   Any failure to vote, or a vote to abstain, will have the effect of a vote
against the merger and the merger agreement.
 
   Under NYSE rules, brokers who hold shares in street name for customers have
the authority to vote on certain "routine" proposals when they have not
received instructions from beneficial owners. However, such brokers are
precluded from exercising their voting discretion with respect to the approval
and adoption of non-routine matters such as the merger and the merger agreement
and, thus, absent specific instructions from the beneficial owner of such
shares, brokers are not empowered to vote such shares with respect to the
merger and the merger agreement. These "broker non-votes" will therefore have
the effect of a vote against the merger and the merger agreement.
 
                                       68
<PAGE>
 
         DIRECTORS AND OFFICERS OF SANTA FE SNYDER FOLLOWING THE MERGER
 
   It is anticipated that the board of directors or the executive officers of
Santa Fe will change as a result of the merger. The names of the persons who
will be the directors and officers of Santa Fe Snyder following the merger are
set forth below:
 
   Directors
 
     John C. Snyder--Chairman
     William E. Greehey
     Melvyn N. Klein
     Allan V. Martini
     James L. Payne
     Reuben F. Richards
     Kathryn D. Wriston
     Class I Nominee
     Class II Nominee
     Class III Nominee
     Class III Nominee
 
   Executive Officers
 
     James L. Payne, Chief Executive Officer
     Hugh L. Boyt, President--Production
     William G. Hargett, President--North America
     Duane C. Radtke, Executive Vice President--Production
     Tim S. Parker, Executive Vice President--Exploration
     Mark A. Jackson, Executive Vice President and Chief Financial Officer
     Janet F. Clark, Executive Vice President--Corporate Development and
  Administration
     David L. Hicks, Vice President--Law and General Counsel
 
                        COMPARISON OF STOCKHOLDER RIGHTS
 
General
 
   The rights of Santa Fe stockholders are currently governed by the Delaware
General Corporation Law and the certificate of incorporation and bylaws of
Santa Fe (also referred to as the Santa Fe charter and the Santa Fe bylaws).
The rights of Snyder stockholders are currently governed by the Delaware
General Corporation Law and the certificate of incorporation and bylaws of
Snyder (also referred to as the Snyder charter and the Snyder bylaws).
Accordingly, upon consummation of the merger, the rights of Santa Fe
stockholders and of Snyder stockholders who become Santa Fe stockholders in the
merger will be governed by the Delaware General Corporation Law, the Santa Fe
charter and the Santa Fe bylaws. The following is a summary of the principal
differences between the current rights of Snyder stockholders and those of
Santa Fe stockholders following the merger.
 
   The following summary of the material differences between the Santa Fe
charter, the Santa Fe bylaws, the Snyder charter and the Snyder bylaws may not
contain all the information that is important to you. To review all provisions
and differences of such documents in full detail, please read the full text of
such documents and the Delaware General Corporation Law. For information as to
how such documents may be obtained, see "Where You Can Find More Information"
on page 80.
 
   Copies of the Snyder charter, Snyder bylaws, Santa Fe charter and Santa Fe
bylaws will be sent to holders of shares of Santa Fe common stock and Snyder
common stock upon request. See "Where You Can Find More Information" on page
80.
 
                                       69
<PAGE>
 
   The Snyder and Santa Fe bylaws are not being amended in conjunction with the
merger. The Santa Fe charter is being amended to increase the number of
authorized shares of capital stock, as discussed below.
 
   A summary of the terms of the Snyder and Santa Fe rights plans follows the
summary comparison of terms of Santa Fe and Snyder common stock.
 
Summary Comparison of Terms of Santa Fe Common Stock and Snyder Common Stock
 
<TABLE>
<CAPTION>
                                Snyder                Santa Fe
                                ------                --------
<S>                    <C>                        <C> 
Authorized Capital
Stock; Amendment of
Charter..............  The authorized capital     Concurrently with
                       stock of Snyder consists   consummation of the merger,
                       of 75,000,000 shares of    the Santa Fe charter will be
                       Snyder common stock and    amended to increase Santa
                       10,000,000 shares of       Fe's authorized capital
                       preferred stock. The       stock to 300,000,000 shares
                       Snyder charter is not      of Santa Fe common stock,
                       being amended in           par value $.01 per share,
                       conjunction with the       and 50,000,000 shares of
                       merger.                    Santa Fe preferred stock,
                                                  par value $.01 per share,
                                                  and to change the corporate
                                                  name of the surviving
                                                  corporation to Santa Fe
                                                  Snyder Corporation. Promptly
                                                  after the merger, the Santa
                                                  Fe Snyder board of directors
                                                  will amend the certificate
                                                  of designation for the
                                                  Series A Junior
                                                  Participating Preferred
                                                  Stock to increase the number
                                                  of shares of preferred stock
                                                  so designated thereby to
                                                  3,000,000. See "Description
                                                  of Santa Fe Capital Stock--
                                                  Authorized Capital Stock" on
                                                  page 77.
 
Board of Directors...  The Snyder bylaws          The Santa Fe bylaws provide
                       provide that the number    that the number of directors
                       of directors shall be      shall be not fewer than 3
                       one or more persons,       nor greater than 15 persons,
                       with the exact number to   with the exact number to be
                       be determined by the       determined by a resolution
                       Snyder board of            of a majority of the Santa
                       directors. Snyder          Fe board of directors. Santa
                       currently has 9            Fe currently has 6
                       directors. The Snyder      directors. Pursuant to the
                       bylaws do not provide      Santa Fe charter, the Santa
                       for a classified board;    Fe board is classified into
                       all directors are          three classes, with
                       elected annually. A        directors of each class
                       quorum consisting of       serving until the third
                       one-third of the total     annual meeting of
                       number of Snyder           stockholders after the
                       directors then in office   annual meeting at which that
                       (but not less than two     class was elected. A quorum
                       if the number of           consisting of a majority of
                       directors is greater       the Santa Fe directors
                       than one) is required      holding office is required
                       for the transaction of     for the transaction of
                       business at a meeting of   business at a meeting of the
                       the Snyder board.          Santa Fe board. Neither the
                       Neither the Snyder         Santa Fe charter nor the
                       charter nor the Snyder     Santa Fe bylaws provide for
                       bylaws provide for         cumulative voting for
                       cumulative voting for      election of directors.
                       the election of
                       directors.
</TABLE> 
 
                                       70
<PAGE>
 
<TABLE>
<S>  <C>
                                Snyder                      Santa Fe
                                ------                      --------
 
                       Nominations of persons     Nominations of persons for
                       for election to the        election to the Santa Fe
                       Snyder board may be made   board may be made by or at
                       by the Snyder board, or    the direction of the Santa
                       by any Snyder              Fe board, or by any Santa Fe
                       stockholder according to   stockholder according to the
                       the procedures described   procedures described in the
                       in the Snyder bylaws.      Santa Fe bylaws. Under the
                       Under the Snyder bylaws,   Santa Fe bylaws, vacancies
                       vacancies in the Snyder    in the Santa Fe board may be
                       board may be filled by a   filled by resolution of a
                       vote of the stockholders   majority of the remaining
                       or their written           Santa Fe board, and any
                       consent, or by a vote of   director so appointed will
                       the Snyder board or by     hold office for the
                       the directors' written     remaining term of the class
                       consent, and any           to which such directorship
                       director so appointed      is assigned, until his
                       will hold office until     successor is elected and
                       the earlier to occur of    qualified or until his
                       the next annual election   resignation or removal, in
                       of directors, his          any case, whichever occurs
                       successor is elected and   first. Pursuant to the Santa
                       qualified or his death,    Fe charter and bylaws any
                       resignation or removal.    director may be removed from
                       The Snyder bylaws          office, but only for cause,
                       provide that the           by the affirmative vote of
                       directors may be removed   the holders of a majority of
                       from office, with or       the shares entitled to vote
                       without cause, at any      in the election of
                       time by vote of the        directors.
                       holders of a majority of
                       shares entitled to vote
                       at an election of
                       directors, or by written
                       consent of the
                       stockholders.
 
                                                  Under the merger agreement
                                                  we have agreed that Santa Fe
                                                  Snyder will have a
                                                  nominating committee
                                                  consisting of Messrs.
                                                  Snyder, Payne and two
                                                  additional members of the
                                                  board of directors, one of
                                                  which will be designated by
                                                  Mr. Snyder and the other by
                                                  Mr. Payne.
 
Adjournment of
Stockholder Meetings.. Under the Delaware         The Santa Fe bylaws provide
                       General Corporation Law,   that if a quorum (consisting
                       a quorum for a meeting     of a majority) is not
                       of the Snyder              present, in person or by
                       stockholders consists of   proxy, at any meeting of the
                       a majority of the shares   stockholders, the Santa Fe
                       entitled to vote,          Chairman or the stockholders
                       present in person or by    entitled to vote thereat who
                       proxy. If a quorum is      are present, in person or by
                       not present at a meeting   proxy, may adjourn the
                       of the Snyder              meeting from time to time,
                       stockholders, no action    provided that, if the
                       may be taken at the        adjournment is for more than
                       meeting.                   30 days or if after the
                                                  adjournment a new record
                                                  date is fixed for the
                                                  adjourned meeting, a notice
                                                  of the adjourned meeting
                                                  shall be given to each
                                                  stockholder of record
                                                  entitled to vote at the
                                                  adjourned meeting.
</TABLE>
 
                                       71
<PAGE>
 
<TABLE>
<S>  <C>
                                Snyder                      Santa Fe
                                ------                      --------
 
Notice of Stockholder
Meetings.............  The Snyder bylaws          The Santa Fe bylaws
                       establish notice           establish advance notice
                       procedures in connection   procedures with regard to
                       with the nomination of     the nomination, other than
                       candidates for election    by or at the direction of
                       of directors and with      the Santa Fe board, of
                       regard to certain          candidates for election as
                       matters to be brought      directors and with regard to
                       before an annual meeting   certain matters to be
                       of stockholders. These     brought before an annual
                       procedures provide that    meeting of stockholders.
                       the notice of proposed     These procedures provide
                       stockholder nominations    that the notice of proposed
                       for the election of        stockholder nominations for
                       directors must be timely   the election of directors
                       given in writing to the    must be timely given in
                       Secretary of Snyder at     writing to the Secretary of
                       least 90 days prior to     Santa Fe. To be timely, such
                       the anniversary date of    notice must be delivered to
                       the immediately            the principal executive
                       preceding annual meeting   offices of Santa Fe not less
                       of stockholders or no      than 90 days nor more than
                       later than 10 days         120 days prior to the
                       following the day on       meeting; provided, however,
                       which notice of a          that if less than 100 days'
                       special meeting of the     notice or prior public
                       stockholders was mailed    disclosure of the date of
                       or public disclosure of    the meeting is given or made
                       the date of the special    to stockholders, notice by
                       meeting was made,          the stockholder to be timely
                       whichever first occurs.    must be so received not
                       The procedures also        later than the close of
                       provide that at any        business on the 10th day
                       annual meeting, and        following the day on which
                       subject to any other       such notice of the date of
                       applicable requirements,   the meeting was mailed or
                       only such business may     such public disclosure was
                       be conducted as has been   made. The procedures also
                       brought before the         provide that at any annual
                       meeting, by, or at the     meeting of the stockholders
                       direction of, the Snyder   of Santa Fe, and subject to
                       board or by a              any other applicable
                       stockholder who has        requirements, only such
                       given timely prior         business may be conducted as
                       written notice to the      has been brought before the
                       Secretary of Snyder of     meeting by, or at the
                       such stockholder's         direction of, the Santa Fe
                       intention to bring such    board or by a stockholder
                       business before the        who has given timely prior
                       meeting. To be timely, a   written notice to the
                       stockholder's notice       Secretary of Santa Fe, of
                       must be delivered to or    such stockholder's intention
                       mailed and received at     to bring such business
                       the principal executive    before the meeting. To be
                       offices of Snyder not      timely, such notice must be
                       less than 120 days prior   delivered or mailed and
                       to the anniversary date    received at the principal
                       of the proxy statement     executive offices of Santa
                       for the preceding annual   Fe not less than 120 days
                       meeting of the             from the date of the release
                       stockholders of Snyder.    of Santa Fe's proxy
                       The notice must contain    statement relating to the
                       certain information        prior year's annual meeting
                       specified in the Snyder    of stockholders; provided,
                       bylaws.                    however, if no annual
                                                  meeting was held in the
                                                  prior year or if the current
                                                  year's annual meeting shall
                                                  be held more than 30 days
                                                  prior to or after the date
                                                  of the previous year's
                                                  annual meeting, a
                                                  stockholder's notice shall
                                                  be timely if received by
                                                  Santa Fe
</TABLE>
 
                                       72
<PAGE>
 
<TABLE>
<S>  <C>
                                Snyder                      Santa Fe
                                ------                      --------
 
                                                  not later than the close of
                                                  business on the 10th day
                                                  following the date on which
                                                  such notice of the date of
                                                  Santa Fe's annual meeting
                                                  was mailed or public
                                                  disclosure thereof was made.
                                                  The notice must contain
                                                  certain information
                                                  specified in the Santa Fe
                                                  bylaws.
 
Special Meetings of
Stockholders.........  The Snyder bylaws          The Santa Fe bylaws provide
                       provide that special       that special meetings of
                       meetings of the            stockholders may be called
                       stockholders may be        by the Santa Fe board. Santa
                       called by the Snyder       Fe stockholders may not call
                       board, by Snyder's         a special meeting.
                       Chairman, Vice Chairman,
                       President or Secretary,
                       or by the record holders
                       of a majority of the
                       shares of Snyder common
                       stock then issued and
                       outstanding.
 
Stockholder Consent in
Lieu of Meeting......  The Snyder charter does    The Santa Fe charter
                       not restrict action by     provides that no action may
                       written consent of the     be taken by the stockholders
                       stockholders in lieu of    except at an annual or
                       a meeting of the           special meeting of such
                       stockholders. The Snyder   stockholders and that the
                       bylaws provide that        stockholders of Santa Fe may
                       stockholder action         not act by written consent.
                       required or permitted to
                       be taken at an annual or
                       at a special meeting of
                       the stockholders may be
                       taken by written consent
                       if such consent is
                       signed by the holders of
                       outstanding stock having
                       not less than the
                       minimum number of votes
                       that would be required
                       to authorize or take
                       such action at a meeting
                       at which all shares
                       entitled to vote on such
                       action were present and
                       voted.
 
Amendment of Corporate
Charter and Bylaws...  The Snyder charter does    The Santa Fe charter
                       not provide special        provides that certain
                       provisions regarding its   provisions relating to,
                       amendment; therefore,      among others, the
                       the Snyder charter may     composition and
                       be amended pursuant to     classification of the Santa
                       the Delaware General       Fe board, amendment of the
                       Corporation Law. The       Santa Fe bylaws, issuance of
                       Delaware General           rights to purchase Santa Fe
                       Corporation Law provides   capital stock and
                       that a charter amendment   limitations on the liability
                       requires the approval of   of directors contained
                       a majority of the          therein may only be amended
                       company's board of         by the affirmative vote of
                       directors and the          at least 80% of the voting
                       approval of the holders    power of all of the then
                       of a majority of the       outstanding shares of Santa
                       voting power of the then   Fe capital stock entitled to
                       outstanding capital        vote in an election of
                       stock of the company.      directors, voting together
                                                  as a single class. Amendment
                                                  of any other provision
</TABLE>
 
                                       73
<PAGE>
 
<TABLE>
<S>  <C>
                                Snyder                      Santa Fe
                                ------                      --------
 
                                                  of the Santa Fe charter or
                                                  any provision of the Snyder
                                                  charter is governed by the
                                                  Delaware General Corporation
                                                  Law. The Delaware General
                                                  Corporation Law provides
                                                  that a charter amendment
                                                  requires the approval of a
                                                  majority of the company's
                                                  board of directors and the
                                                  approval of the holders of a
                                                  majority of the voting power
                                                  of the then outstanding
                                                  capital stock of the
                                                  company.
 
                       The Snyder charter         The Santa Fe charter
                       authorizes the Snyder      authorizes the Santa Fe
                       board to adopt, amend      board to alter, amend or
                       and repeal the Snyder      repeal the Santa Fe bylaws
                       bylaws. The Snyder         or adopt new Santa Fe
                       bylaws expressly provide   bylaws. The Santa Fe charter
                       for their amendment or     and bylaws require an
                       repeal by the Snyder       affirmative vote of not less
                       board, by the directors'   than 80% of the voting power
                       written consent, by the    of all outstanding shares of
                       vote or written consent    Santa Fe capital stock
                       of holders of a majority   entitled to vote in the
                       of the shares then         election of directors,
                       entitled to vote at an     voting as a single class,
                       election of directors.     for the Santa Fe
                                                  stockholders to amend the
                                                  Santa Fe bylaws. The Santa
                                                  Fe bylaws authorize the
                                                  Santa Fe board to make,
                                                  repeal, alter, amend or
                                                  rescind any of the Santa Fe
                                                  bylaws by an affirmative
                                                  vote of a majority of the
                                                  entire Santa Fe board.
 
Removal of Officers..  The Snyder bylaws permit   The Santa Fe bylaws permit
                       the removal of any         the removal of any officer
                       officer at any time with   elected by the board at any
                       or without cause by the    time with or without cause
                       Snyder board or the        by the Santa Fe board.
                       Snyder stockholders.
</TABLE>
 
Snyder Rights Plan
 
   Snyder has entered into a rights agreement with ChaseMellon Shareholder
Services, L.L.C., as rights agent. Pursuant to the Snyder rights agreement,
rights attach to each share of Snyder common stock outstanding and entitle the
registered holder to purchase from Snyder one one-thousandth of a share of
Junior Participating Preferred Stock, par value $.01 per share, of Snyder at a
purchase price of $70 which is subject to adjustment as described in the Snyder
rights agreement. Each share of Snyder common stock outstanding has attached
thereto one Snyder right.
 
   The Snyder rights will separate from the Snyder common stock upon the
earlier of
 
  . 10 business days following a public announcement that a person or group
    of affiliated or associated persons (also referred to as a Snyder
    acquiring person) has acquired or obtained the right to acquire
    beneficial ownership of 20% or more of the outstanding shares of Snyder
    common stock and
 
  . 10 business days or such later date as may be fixed by the Snyder board
    following the commencement of a tender offer or exchange offer that would
    result in a person or group beneficially owning 20% or more of such
    outstanding shares of Snyder common stock.
 
   The date of any such event is referred to as the Snyder distribution date.
 
   Until the Snyder distribution date,
 
  . the Snyder rights will be evidenced by Snyder common stock certificates
    and will be transferred with and only with Snyder common stock
    certificates,
 
                                       74
<PAGE>
 
  . new Snyder common stock certificates will contain a notation
    incorporating the Snyder rights agreement by reference, and
 
  . the transfer of any certificates representing outstanding Snyder common
    stock will also constitute the transfer of the Snyder rights associated
    with the Snyder common stock represented by such certificate.
 
   If Snyder is acquired in a merger or other business combination transaction
or 50% or more of its consolidated assets or earning power are sold after a
person or group has become a Snyder acquiring person, each holder of a Snyder
right will thereafter have the right to receive, upon the exercise thereof at
the then current exercise price of the Snyder right, that number of shares of
common stock of the acquiring company which at the time of such transaction
will have a market value of two times the exercise price of the Snyder right.
In the event that any person or group of affiliated or associated persons
becomes a Snyder acquiring person, each holder of a Snyder right, other than
Snyder rights beneficially owned by the Snyder acquiring person which will
thereafter be void, will thereafter have the right to receive upon exercise
that number of shares of Snyder common stock having a market value of two times
the exercise price of the Snyder right.
 
   At any time after any person or group becomes a Snyder acquiring person and
prior to the acquisition by such person or group of 50% or more of the
outstanding Snyder common stock, the Snyder board may exchange the Snyder
rights other than Snyder rights owned by such person or group which will have
become void, in whole or in part, generally at an exchange ratio of one share
of Snyder common stock, or one one-thousandth of a share of Snyder Junior
Participating Preferred Stock, for each two shares of Snyder common stock for
which each Snyder right is then exercisable.
 
   The Snyder rights are not exercisable until the Snyder distribution date and
will expire at the close of business on May 21, 2007 unless earlier redeemed by
Snyder as further described in the Snyder rights agreement. At no time will the
holder of the Snyder rights as such have any voting power or any rights as a
stockholder. Subject to certain exceptions, any of the provisions of the Snyder
rights agreement may be amended by the Snyder board prior to the Snyder
distribution date.
 
   Pursuant to the merger agreement, Snyder has amended the Snyder rights
agreement so as to render the Snyder rights inapplicable to the merger and the
other transactions contemplated by the merger agreement. See "The Merger
Agreement--Certain Representations and Warranties" on page 61.
 
   The above summary of the Snyder rights agreement may not contain all the
information that is important to you. For a more detailed description of the
Snyder rights, you should read the Snyder rights agreement, which is
incorporated by reference into this document. See "Where You Can Find More
Information" on page 80.
 
Santa Fe Rights Plan
 
   Santa Fe has entered into a rights agreement with First Chicago Trust
Company of New York as rights agent. Pursuant to the Santa Fe rights agreement,
rights attach to each share of Santa Fe common stock outstanding and entitle
the registered holder to purchase from Santa Fe one one-hundredth of a share of
Series A Junior Participating Preferred Stock at a purchase price of $42 (also
referred to as the Santa Fe purchase price) which is subject to adjustment as
described in the Santa Fe rights agreement. Each share of Santa Fe common stock
outstanding has attached thereto one Santa Fe right.
 
   The Santa Fe rights will separate from the Santa Fe common stock upon the
earlier of:
 
  . 10 business days following a public announcement that, subject to certain
    exceptions, a person or group of affiliated or associated persons (also
    referred to as a Santa Fe acquiring person) has acquired or obtained the
    right to acquire beneficial ownership of 15% or more of the outstanding
    shares of Santa Fe common stock, with the date of any such event referred
    to as the Santa Fe stock acquisition date; or
 
  . 10 business days or such later date as may be fixed by the Santa Fe board
    following the commencement of, or announcement of an intention to make, a
    tender offer or exchange offer that would result in a person or group
    beneficially owning 15% or more of such outstanding shares of Santa Fe
    common stock.
 
                                       75
<PAGE>
 
  The date of any such event is referred to as the Santa Fe distribution
    date.
 
   Until the Santa Fe distribution date:
 
  . the Santa Fe rights will be evidenced by Santa Fe common stock
    certificates with a copy of a summary of the terms of the Santa Fe rights
    attached and will be transferred with and only with Santa Fe common stock
    certificates;
 
  . new Santa Fe common stock certificates will contain a notation
    incorporating the Santa Fe rights agreement by reference; and
 
  . the transfer of any certificates representing outstanding Santa Fe common
    stock will also constitute the transfer of the Santa Fe rights associated
    with Santa Fe common stock represented by such certificate.
 
   The Santa Fe rights will not be exercisable until the Santa Fe distribution
date and will cease to be exercisable at the close of business on July 25,
1999, unless this date is extended or unless the Santa Fe rights are earlier
redeemed or exchanged by Santa Fe, as described below.
 
   If Santa Fe is acquired in a merger or other business combination
transaction or 50% or more of its consolidated assets or earning power are sold
after a person or group has become a Santa Fe acquiring person, each holder of
a Santa Fe right, other than Santa Fe rights beneficially owned by a Santa Fe
acquiring person which will be void, will have the right to receive, upon the
exercise thereof at the then-current exercise price of the Santa Fe right, that
number of shares of common stock of the Santa Fe acquiring person which at the
time of such transaction will have a market value of two times the exercise
price of the Santa Fe right. In the event that any person or group of
affiliated or associated persons becomes a Santa Fe acquiring person, each
holder of a Santa Fe right, other than Santa Fe rights beneficially owned by
the Santa Fe acquiring person which will thereafter be void, will have the
right to receive upon exercise that number of shares of Santa Fe common stock
having a market value of two times the exercise price of the Santa Fe right.
 
   In general, Santa Fe may redeem the Santa Fe rights in whole, but not in
part, at any time until 10 days following the Santa Fe stock acquisition date,
which period may be extended at any time while the Santa Fe rights are still
redeemable, at a price of $.01 per Santa Fe right, payable in cash, Santa Fe
common stock or other consideration deemed appropriate by the Santa Fe board.
Immediately upon the action of the Santa Fe board ordering redemption of the
Santa Fe rights, the Santa Fe rights will terminate and the only right of the
holders of Santa Fe rights will be to receive the $.01 per Santa Fe right
redemption price.
 
   Until a Santa Fe right is exercised, the holder thereof, as such, will have
no rights as a stockholder of Santa Fe, including the right to vote or to
receive dividends.
 
   Other than reducing the Santa Fe purchase price of the Santa Fe rights, any
of the provisions of the Santa Fe rights agreement may be amended by the Santa
Fe board prior to the Santa Fe distribution date, without the consent of the
holders of the Santa Fe rights, to shorten or lengthen any time period or
otherwise. After the Santa Fe distribution date, the provisions of the Santa Fe
rights agreement may be amended by the Santa Fe board, without the consent of
the holders of the Santa Fe rights, except that:
 
  . no amendment can be made to reduce the Santa Fe purchase price;
 
  . no amendment may adversely affect the interests of the holders of the
    Santa Fe rights; and
 
  . the redemption right cannot be reinstated.
 
   The Santa Fe rights agreement is inapplicable to the merger and the other
transactions contemplated by the merger agreement. See "The Merger Agreement--
Certain Representations and Warranties" on page 61.
 
   The above summary of the Santa Fe rights agreement may not contain all the
information that is important to you. For a more detailed description of the
Santa Fe rights, you should read the Santa Fe rights agreement, which is
incorporated by reference into this document. See "Where You Can Find More
Information" on page 80.
 
                                       76
<PAGE>
 
                     DESCRIPTION OF SANTA FE CAPITAL STOCK
 
   The summary of the terms of the capital stock of Santa Fe set forth below
may not contain all the information that is important to you and is qualified
in its entirety by reference to the Santa Fe Charter and the Santa Fe Bylaws.
Copies of the Santa Fe Charter and Santa Fe Bylaws will be sent to holders of
shares of Santa Fe common stock and Snyder common stock upon request. See
"Where You Can Find More Information" on page 80. For a comparison of certain
provisions of the Santa Fe Charter and the Snyder Charter, see "Comparison of
Stockholder Rights" on page 69.
 
Authorized Capital Stock
 
   Under the Santa Fe Charter, Santa Fe's authorized capital stock consists of
200,000,000 shares of Santa Fe common stock, par value $.01 per share, and
50,000,000 shares of Santa Fe preferred stock, par value $.01 per share. In
connection with the merger, the Santa Fe Charter is being amended to increase
Santa Fe's authorized capital stock to 300,000,000 shares of Santa Fe common
stock and 50,000,000 shares of Santa Fe preferred stock.
 
Common Stock
 
   The holders of Santa Fe common stock are entitled to one vote per share for
each share held of record on all matters submitted to a vote of stockholders.
Subject to preferences that may be applicable to any outstanding Santa Fe
preferred stock, holders of Santa Fe common stock are entitled to receive
ratably such dividends as may be declared by the Santa Fe board out of funds
legally available therefor. In the event of a liquidation or dissolution of
Santa Fe, holders of Santa Fe common stock are entitled to share ratably in all
assets remaining after payment of liabilities and the liquidation preference of
any outstanding Santa Fe preferred stock.
 
   Holders of Santa Fe common stock have no preemptive rights and have no
rights to convert their Santa Fe common stock into any other securities. All of
the outstanding shares of Santa Fe common stock are, and the shares of Santa Fe
common stock issued pursuant to the merger will be, duly authorized, validly
issued, fully paid and nonassessable.
 
Preferred Stock
 
   The Santa Fe board is authorized to designate any series of Santa Fe
preferred stock and the powers, preferences and rights of the shares of such
series and the qualifications, limitations or restrictions thereof without
further action by the holders of the Santa Fe common stock. There are 2,000,000
shares designated as Series A Junior Participating Preferred Stock, which
designation is expected to be increased to 3,000,000 shares after the merger.
As of February 1, 1999, there were no shares of Series A Junior Participating
Preferred Stock outstanding.
 
Transfer Agent and Registrar
 
   First Chicago is the transfer agent and registrar for the Santa Fe common
stock.
 
Stock Exchange Listing; Delisting and Deregistration of Snyder Common Stock
 
   It is a condition of the merger that the shares of Santa Fe common stock
issuable in the merger be approved for listing on the NYSE on or prior to the
effective time, subject to official notice of issuance. If the merger is
consummated, Snyder common stock will cease to be listed on the NYSE.
 
                                       77
<PAGE>
 
                             ELECTION OF DIRECTORS
 
   The Santa Fe stockholders will vote on the election of five directors to the
Santa Fe Snyder board at the Santa Fe special meeting, subject to the
consummation of the merger. Santa Fe's bylaws provide for a classified board of
directors. The Santa Fe board of directors is divided into Classes I, II and
III, the terms of which are currently scheduled to expire respectively on the
dates of Santa Fe's Annual Meeting of Stockholders in 1999, 2000 and 2001.
Pursuant to the terms of the merger agreement, at the effective time, the size
of Santa Fe Snyder's board of directors will be increased from Santa Fe's
current number of six directors to eleven directors for Santa Fe Snyder, and
five individuals identified below, each of which was designated by the Snyder
board of directors in accordance with the merger agreement and whose nomination
has been unanimously approved by the Santa Fe board of directors, will, subject
to consummation of the merger, be elected to serve on the Santa Fe Snyder board
of directors. Of these individuals, one will be a Class I director of Santa Fe
Snyder, two will be Class II directors and two will be Class III directors.
 
   The terms of the directors elected at the Santa Fe special meeting will
expire at the Santa Fe Snyder annual meeting of stockholders in the year
indicated above applicable to their class and until their respective successors
shall have been elected and qualified. Each of the individuals designated by
Snyder currently serves as a director of Snyder.
 
   A plurality of the votes cast in person or by proxy at the Santa Fe special
meeting by the holders of Santa Fe common stock is required to elect a
director. Accordingly, under Delaware law and Santa Fe's charter and bylaws,
abstentions and broker non-votes will have no effect on the election of
directors. Stockholders may not cumulate their votes in the election of
directors.
 
   Unless otherwise instructed or unless authority to vote is withheld, the
enclosed proxy will be voted "for" the election of the nominees to the Santa Fe
Snyder board of directors listed in the table below. Although the Santa Fe
board does not contemplate that any of the nominees will be unable to serve, if
such a situation arises prior to the Santa Fe special meeting, the persons
named in the enclosed proxy will vote for the election of such other person(s)
as may be designated by the Snyder board of directors, in accordance with the
terms of the merger agreement.
 
Nominees
 
   The following table sets forth information regarding the names, ages,
principal occupations and directorships in other companies held by the nominees
for director, whose terms will commence immediately after the merger:
 
<TABLE>
<CAPTION>
     Nominees       Age          Current Position          Position with Santa Fe Snyder
     --------       ---          ----------------          -----------------------------
<S>                 <C> <C>                                <C>
Class I Nominee
  [one]
 
Class II Nominees
  John C. Snyder     57 Chairman and director of Snyder,
                        Director, SOCO International plc,
                        Director of Snyder since prior to
                        1993
  [one additional]
 
Class III Nominees
  [two]
</TABLE>
 
   Each of the nominees named above has been engaged in the principal
occupation set forth opposite his name for the past five years except as
follows:
 
   [Insert as necessary.]
 
                                       78
<PAGE>
 
   The Santa Fe board recommends that Santa Fe Stockholders vote "for" the
election of each of the above-named nominees.
 
                                 LEGAL MATTERS
 
   The validity of the Santa Fe common stock to be issued to Snyder
stockholders pursuant to the merger will be passed upon by Andrews & Kurth
L.L.P., counsel to Santa Fe. It is a condition to the consummation of the
merger that Snyder receive an opinion from Vinson & Elkins L.L.P. and Santa Fe
receive an opinion from Andrews & Kurth L.L.P., each opinion stating that the
merger is tax-free to each company's stockholders except, with respect to the
Snyder stockholders, to the extent they receive cash in lieu of fractional
shares. See "The Merger--Material U.S. Federal Income Tax Consequences" and
"The Merger Agreement--Conditions to the Merger" on pages 50 and 61,
respectively.
 
                                    EXPERTS
 
   The consolidated financial statements incorporated in this Joint Proxy
Statement/Prospectus by reference to the Annual Report on Form 10-K of Santa Fe
Energy Resources, Inc. for the year ended December 31, 1997, have been so
incorporated in reliance on the report of PricewaterhouseCoopers LLP,
independent accountants, given on the authority of said firm as experts in
auditing and accounting.
 
   The consolidated financial statements of Snyder for the year ended December
31, 1997, incorporated by reference in this document have been audited by
Arthur Andersen LLP, independent accountants, as indicated in their report with
respect thereto, and are incorporated herein in reliance on their report given
upon their authority as experts in accounting and auditing in giving such
reports.
 
                          FUTURE STOCKHOLDER PROPOSALS
 
   Santa Fe has announced that its 1999 annual meeting will be held on      ,
1999 instead of May 11, 1999, as announced previously. Pursuant to Santa Fe's
bylaws and the applicable securities laws, stockholder proposals submitted for
consideration at Santa Fe's 1999 annual meeting of stockholders have to be
submitted to the Secretary of Santa Fe by            , 1999. If such timely
notice of a stockholder proposal is not given, the proposal may not be brought
before the annual meeting. If timely notice is given but is not accompanied by
a written statement to the extent required by applicable securities laws, Santa
Fe may exercise discretionary voting authority over proxies with respect to
such proposal if presented at Santa Fe's 1999 annual meeting of stockholders.
 
   Snyder expects to hold an annual meeting of stockholders in the second
calendar quarter of 1999 unless the merger is completed prior thereto. Pursuant
to Snyder's bylaws and the applicable securities laws, stockholder proposals
submitted for consideration at Snyder's 1999 annual meeting of stockholders (if
one should occur) should have been submitted to the Secretary of Snyder by
December 17, 1998. If such timely notice of a stockholder proposal was not
given, the proposal may not be brought before the annual meeting. If timely
notice was given but was not accompanied by a written statement to the extent
required by applicable securities laws, Snyder may exercise discretionary
voting authority over proxies with respect to such proposal if presented at
Snyder's 1999 annual meeting of stockholders.
 
   Securities and Exchange Commission rules set forth standards as to what
stockholder proposals are required to be included in a proxy statement for an
annual meeting.
 
                                       79
<PAGE>
 
                      WHERE YOU CAN FIND MORE INFORMATION
 
   Santa Fe and Snyder file annual, quarterly and special reports, proxy
statements and other information with the Commission. You may read and copy any
reports, statements or other information filed by Santa Fe and Snyder at the
Commission's public reference room at 450 Fifth Street, N.W., Washington, D.C.
20549, or at the Commission's public reference rooms in New York, New York and
Chicago, Illinois. Please call the Securities and Exchange Commission at 1-800-
SEC-0330 for further information on the public reference rooms. The filings of
Santa Fe and Snyder with the Securities and Exchange Commission are also
available to the public from commercial document retrieval services and at the
web site maintained by the Securities and Exchange Commission at
http://www.sec.gov.
 
   Santa Fe filed a registration statement on Form S-4 to register with the
Securities and Exchange Commission Santa Fe common stock to be issued to Snyder
stockholders in the merger. The registration statement on Form S-4 also covers
Santa Fe common stock that may be issued upon exercise of Snyder stock options
assumed by Santa Fe in the merger. This document is a part of that registration
statement and constitutes a prospectus of Santa Fe in addition to being a proxy
statement of each of Snyder and Santa Fe. As allowed by Securities and Exchange
Commission rules, this document does not contain all the information you can
find in the registration statement or the exhibits to the registration
statement.
 
   The Securities and Exchange Commission allows Santa Fe and Snyder to
"incorporate by reference" information into this document, which means that
they can disclose important information to you by referring you to another
document filed separately with the Commission. The information incorporated by
reference is deemed to be part of this document, except for any information
superseded by information in this document. This document incorporates by
reference the documents set forth below that Santa Fe and Snyder have
previously filed with the Commission. These documents contain important
information about Santa Fe and Snyder and their finances.
 
<TABLE>
<CAPTION>
    Santa Fe Securities and Exchange
 Commission Filings (File No. 1-07667)                 Period
 -------------------------------------                 ------
 <C>                                    <S>
 Annual Report on Form 10-K             Year Ended December 31, 1997
 Quarterly Reports on Form 10-Q         Quarters Ended March 31, 1998, June
                                         30, 1998 and September 30, 1998
 Current Reports on Form 8-K            Filed December 11, 1998, January 20,
                                         1999 and
                                         January 29, 1999
 Proxy Statement on Schedule 14A for    Filed March 20, 1998
  1998 Annual Meeting
 
<CAPTION>
     Snyder Securities and Exchange
 Commission Filings (File No. 1-10509)                 Period
 -------------------------------------                 ------
 <C>                                    <S>
 Annual Report on Form 10-K             Year Ended December 31, 1997
 Quarterly Reports on Form 10-Q         Quarters Ended March 31, 1998, June
                                         30, 1998 and September 30, 1998
 Current Report on Form 8-K             Filed June 1, 1998
 Proxy Statement on Schedule 14A for    Filed April 16, 1998
  1998 Annual Meeting
</TABLE>
 
   Santa Fe and Snyder are also incorporating by reference additional documents
that they file with the Securities and Exchange Commission between the date of
this document and the date of the special meeting.
 
   Santa Fe has supplied all information contained or incorporated by reference
in this document relating to Santa Fe, and Snyder has supplied all such
information relating to Snyder.
 
   If you are a stockholder, Santa Fe and Snyder may have sent you some of the
documents incorporated by reference, but you can obtain any of them through
Santa Fe, Snyder or the Securities and Exchange
 
                                       80
<PAGE>
 
Commission. Documents incorporated by reference are available from Santa Fe and
Snyder without charge. Exhibits to the documents will not be sent, however,
unless those exhibits have specifically been incorporated by reference as
exhibits in this document. Stockholders may obtain documents incorporated by
reference in this document by requesting them in writing or by telephone from
the appropriate party at the following addresses:
 
  Santa Fe Energy Resources, Inc.    Snyder Oil Corporation
  1616 South Voss Road               777 Main Street, Suite 1400
  Houston, Texas 77057               Fort Worth, Texas 76102
  (713) 507-5000                     (817) 338-4043
  Attention: Investor Relations      Attention: Investor Relations
 
   If you would like to request documents from Santa Fe or Snyder, please do so
by          , 1999 to receive them before the special meeting.
 
   You should rely only on the information contained or incorporated by
reference in this document to vote on the merger. We have not authorized anyone
to give any information other than what is in this document, and, if given or
made, you must not rely on such information as having been authorized by either
Santa Fe or Snyder. Neither the delivery of this document nor any distribution
of securities made hereunder shall create an implication that there has been no
change in the affairs of Santa Fe or Snyder since the date of this document or
that the information in this document is correct as of any time subsequent to
the date of this document. All information contained in this document with
respect to Santa Fe has been furnished by Santa Fe, and all information herein
with respect to Snyder has been furnished by Snyder.
 
                                       81
<PAGE>
 
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                           Page
                                                                           ----
<S>                                                                        <C>
Santa Fe Energy Resources, Inc.
  Unaudited Pro Forma Combined Financial Statements--Basis of
   Presentation........................................................... F-2
  Unaudited Pro Forma Condensed Combined Balance Sheet.................... F-3
  Unaudited Pro Forma Condensed Combined Statements of Operations......... F-4
  Notes to Unaudited Pro Forma Condensed Combined Financial Statements.... F-6
</TABLE>
 
                                      F-1
<PAGE>
 
                        SANTA FE ENERGY RESOURCES, INC.
 
               UNAUDITED PRO FORMA COMBINED FINANCIAL STATEMENTS
                             BASIS OF PRESENTATION
 
   The following unaudited pro forma combined financial statements of Santa Fe
Energy Resources, Inc. ("Santa Fe"), and related notes thereto, illustrate the
effects of the proposed merger of Snyder Oil Corporation ("Snyder") into Santa
Fe.
 
   Under the terms of the Merger Agreement, upon consummation of the merger,
each share of Snyder common stock issued and outstanding immediately prior to
the effective time, other than shares owned directly or indirectly by Snyder or
any of its subsidiaries, will be automatically converted into 2.05 shares of
Santa Fe common stock. In addition, each outstanding option of Snyder to
purchase shares of Snyder common stock will be canceled at the effective time
of the merger and, with certain exceptions as described in the Merger
Agreement, Santa Fe Snyder will grant the holder of such former Snyder option
an option to purchase Santa Fe common stock. The number of shares subject to
such Santa Fe option will equal the product of 2.05 times the number of shares
subject to the Snyder option and the exercise price will equal the former
exercise price divided by 2.05.
 
   The merger has been accounted for in the Pro Forma Statements using the
purchase method of accounting. Consequently, the unaudited pro forma condensed
combined balance sheet (the "Pro Forma Balance Sheet") as of September 30, 1998
reflects the recording of assets acquired and liabilities assumed of Snyder at
estimated fair value as if the merger had occurred on that date. The pro forma
combined statements of operations are prepared for the nine months ended
September 30, 1998 and for the year ended December 31, 1997 and illustrate the
effects of the merger as if it had occurred on January 1, 1997.
 
   Based on the closing price of Santa Fe stock on the date of the merger
agreement, management believes that the resulting purchase price allocation
could cause the carrying value of Snyder's historical assets to significantly
exceed future amounts realizable from the assets, creating the likelihood of a
material post-merger writedown of the assets in future periods unless commodity
prices increase above their current levels or other future developments
substantiate the recoverability of the new, higher carrying value of Snyder's
assets. The amount and timing of any writedowns will be determined in the
future by management in accordance with applicable accounting rules based upon
circumstances existing at the time of the review. For example, if after the
merger management's long-term outlook for future commodities prices is
reflective of current NYMEX gas prices of approximately $1.95 per Mcfe, an
impairment would be necessary to the carrying value of Santa Fe Snyder's oil
and gas properties. On such basis, impairments could range from approximately
$150 million to $250 million, on a pre-tax basis, pursuant to the provisions of
Financial Accounting Standard No. 121. Any future writedown would likely have a
material adverse effect on Santa Fe Snyder's net income in the period(s) taken,
but would not affect the company's cash flows.
 
   The Pro Forma Statements should be read in conjunction with the historical
consolidated financial statements of Santa Fe and Snyder, including the notes
thereto, incorporated herein by reference. The management of Santa Fe believes
that the assumptions utilized provide a reasonable basis for presenting the
significant effects of the merger and that the pro forma adjustments give
appropriate effect to those assumptions and are properly applied in the pro
forma financial information. The Pro Forma Statements do not purport to be
indicative of the financial position or results of operations of Santa Fe had
the merger occurred on the dates mentioned above, nor are the Pro Forma
Statements necessarily indicative of the future financial position or results
of operations of Santa Fe.
 
                                      F-2
<PAGE>
 
                        SANTA FE ENERGY RESOURCES, INC.
 
              UNAUDITED PRO FORMA CONDENSED COMBINED BALANCE SHEET
                                 (In Millions)
 
<TABLE>
<CAPTION>
                                              September 30, 1998
                                    -------------------------------------------
                                                         Pro Forma
                                                         Combining    Pro Forma
                                    Santa Fe   Snyder   Adjustments   Combined
              ASSETS                ---------  -------  -----------   ---------
<S>                                 <C>        <C>      <C>           <C>
Current assets..................... $   123.9  $  38.4    $   --      $   162.3
Investments........................               34.3                     34.3
                                                          (537.6)(a)
Property, plant and equipment, at
 cost..............................   1,900.8    537.6     621.0 (b)    2,646.3
                                                           124.5 (b)
Accumulated depletion,
 depreciation, amortization
 and impairment....................  (1,135.1)  (180.3)    180.3 (a)   (1,135.1)
                                    ---------  -------    ------      ---------
Property, plant and equipment,
 net...............................     765.7    357.3     388.2        1,511.2
Other Assets.......................      11.9       --        --           11.9
                                    ---------  -------    ------      ---------
    Total Assets................... $   901.5  $ 430.0    $388.2      $ 1,719.7
                                    =========  =======    ======      =========
<CAPTION>
   LIABILITIES AND SHAREHOLDERS'
              EQUITY
<S>                                 <C>        <C>      <C>           <C>
Current liabilities................ $    97.9  $  77.3    $  9.5 (b)  $   189.4
                                                             4.7 (c)
Long-term debt.....................     306.2    173.8      (2.8)(a)      477.2
Deferred revenues and other
 liabilities.......................      40.9     19.1        --           60.0
Deferred income taxes..............      26.4       --     124.5 (b)      148.5
                                                            (2.4)(c)
Shareholders' equity
  Common stock.....................       1.0      0.4      (0.4)(a)        1.7
                                                             0.7 (b)
  Paid-in capital..................     728.1    238.4    (238.4)(a)    1,144.2
                                                           416.1 (b)
 
                                                           (25.6)(a)
  Retained Earnings (Deficit)......    (291.4)    25.6      (4.3)(c)     (295.7)
  Treasury stock...................      (5.6)   (46.2)     46.2 (a)       (5.6)
  Unamortized restricted stock
   awards..........................      (2.0)      --       2.0 (c)         --
  Unrealized gain or loss on
   investments.....................        --    (58.4)     58.4 (a)         --
                                    ---------  -------    ------      ---------
    Total Liabilities and
     Shareholders' Equity.......... $   901.5  $ 430.0    $388.2      $ 1,719.7
                                    =========  =======    ======      =========
</TABLE>
 
    The accompanying notes are an integral part of these pro forma condensed
                         combined financial statements.
 
                                      F-3
<PAGE>
 
                        SANTA FE ENERGY RESOURCES, INC.
 
   UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENTS OF OPERATIONS
                    (In Millions, Except Per Share Amounts)
 
<TABLE>
<CAPTION>
                                      Nine Months Ended September 30, 1998
                                      ----------------------------------------
                                                        Pro Forma
                                                        Combining    Pro Forma
                                      Santa Fe Snyder  Adjustments   Combined
                                      -------- ------  -----------   ---------
<S>                                   <C>      <C>     <C>           <C>
Revenues:
  Sales of crude oil, liquids and
   natural gas.......................  $222.1  $100.0    $   --       $322.1
  Gas transportation, processing and
   marketing.........................      --     2.5        --          2.5
  Other..............................     0.4      --        --          0.4
                                       ------  ------    ------       ------
    Total revenues...................   222.5   102.5        --        325.0
                                       ------  ------    ------       ------
Costs and expenses:
  Production and operating...........    81.3    22.9        --        104.2
  Cost of gas and transportation.....      --     1.3        --          1.3
  Exploration, including dry hole
   costs.............................    43.2    35.2        --         78.4
  Depletion, depreciation and
   amortization......................    98.6    39.7      32.1 (b)    170.4
  General and administration.........    14.1    12.2        --         26.3
  Taxes other than income............    12.3     5.5        --         17.8
  Loss (gain) on disposition of
   assets............................     1.4    (5.0)       --         (3.6)
                                       ------  ------    ------       ------
    Total costs and expenses.........   250.9   111.8      32.1        394.8
                                       ------  ------    ------       ------
Income (loss) from operations........   (28.4)   (9.3)    (32.1)       (69.8)
  Interest income....................     3.6     2.3        --          5.9
  Interest expense...................   (15.2)  (11.8)       --        (27.0)
  Interest capitalized...............     5.6      --        --          5.6
  Other income (expense).............    (0.2)   (0.1)       --         (0.3)
                                       ------  ------    ------       ------
Income (loss) before income taxes....   (34.6)  (18.9)    (32.1)       (85.6)
  Current income tax (expense)
   benefit...........................     4.4      --        --          4.4
  Deferred income tax (expense)
   benefit...........................    12.5     6.6      11.2 (c)     30.3
                                       ------  ------    ------       ------
Net income (loss)....................  $(17.7) $(12.3)   $(20.9)      $(50.9)
                                       ======  ======    ======       ======
Net income (loss) per common share,
 basic and diluted...................  $(0.17) $(0.37)                $(0.30)
                                       ======  ======                 ======
Weighted average number of shares
 outstanding.........................   102.7    33.4                  171.1
                                       ======  ======                 ======
</TABLE>
 
    The accompanying notes are an integral part of these pro forma condensed
                         combined financial statements.
 
                                      F-4
<PAGE>
 
                        SANTA FE ENERGY RESOURCES, INC.
 
        UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENTS OF OPERATIONS
                    (In Millions, Except Per Share Amounts)
 
<TABLE>
<CAPTION>
                                         Year Ended December 31, 1997
                                  ---------------------------------------------
                                   Santa Fe    Snyder    Pro Forma
                                   Excluding  Excluding  Combining    Pro Forma
                                  Monterey(a) Patina(a) Adjustments   Combined
                                  ----------- --------- -----------   ---------
<S>                               <C>         <C>       <C>           <C>
Revenues:
  Sales of crude oil, liquids
   and natural gas..............    $333.5     $133.9     $   --       $467.4
  Gas transportation, processing
   and marketing................        --        7.0         --          7.0
                                    ------     ------     ------       ------
    Total revenues..............     333.5      140.9         --        474.4
                                    ------     ------     ------       ------
Costs and expenses:
  Production and operating......      87.6       27.0         --        114.6
  Cost of gas and
   transportation...............        --        6.7         --          6.7
  Exploration, including dry
   hole costs...................      48.2       17.0         --         65.2
  Depletion, depreciation and
   amortization.................     105.5       43.6       34.5 (b)    183.6
  Impairment of oil and gas
   properties...................        --        7.3         --          7.3
  General and administrative....      20.5       16.5         --         37.0
  Taxes other than income.......      14.7        8.3         --         23.0
  Loss (gain) on sales of equity
   interests in investees.......        --      (32.8)        --        (32.8)
  Loss (gain) on disposition of
   assets.......................      (3.6)     (14.1)        --        (17.7)
                                    ------     ------     ------       ------
    Total costs and expenses....     272.9       79.5       34.5        386.9
                                    ------     ------     ------       ------
Income (loss) from operations...      60.6       61.4      (34.5)        87.5
  Interest income...............       1.5        2.4         --          3.9
  Interest expense..............     (12.1)     (13.7)        --        (25.8)
  Interest capitalized..........       5.7         --         --          5.7
  Other income (expense)........      (0.6)      (0.5)        --         (1.1)
                                    ------     ------     ------       ------
Income (loss) before income
 taxes, minority
 interest and extraordinary
 item...........................      55.1       49.6      (34.5)        70.2
  Current income tax (expense)
   benefit......................       6.0       (1.0)        --          5.0
  Deferred income tax (expense)
   benefit                           (25.9)     (16.9)      12.1 (c)    (30.7)
                                    ------     ------     ------       ------
Income (loss) before minority
 interest and
 extraordinary item.............      35.2       31.7      (22.4)        44.5
  Minority interest.............        --       (0.6)        --         (0.6)
                                    ------     ------     ------       ------
Income (loss) before
 extraordinary item.............      35.2       31.1      (22.4)        43.9
  Preferred dividend
   requirement..................      (3.6)      (6.0)        --         (9.6)
  Convertible preferred
   premium......................      (8.4)        --         --         (8.4)
                                    ------     ------     ------       ------
Earnings (loss) before
 extraordinary item attributable
 to common shares...............    $ 23.2     $ 25.1     $(22.4)      $ 25.9
                                    ======     ======     ======       ======
Earnings per common share before
 extraordinary item
  Basic.........................    $ 0.24     $ 0.82                  $ 0.16
  Diluted.......................    $ 0.24     $ 0.81                  $ 0.16
Weighted average number of
 shares outstanding
  Basic.........................      98.6       30.6                   161.3
                                    ======     ======                  ======
  Diluted.......................     100.6       31.1                   164.4
                                    ======     ======                  ======
</TABLE>
 
    The accompanying notes are an integral part of these pro forma condensed
                         combined financial statements.
 
                                      F-5
<PAGE>
 
                        SANTA FE ENERGY RESOURCES, INC.
 
      NOTES TO UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS
 
Note 1. Basis of Presentation
 
   The Pro Forma Balance Sheet is presented assuming the merger of Snyder into
Santa Fe occurred on September 30, 1998. The Pro Forma Statements of Operations
have been prepared as if the merger had been consummated as of January 1, 1997.
 
   The merger of Snyder has been accounted for in the Pro Forma Statements
using the purchase method of accounting. The total value to be allocated
between the net assets of Snyder was determined based on the estimated fair
value of the Santa Fe common stock offered to the Snyder stockholders, as
increased to reflect the incremental cash expenses incurred to effect the
merger. The fair value of Santa Fe common stock utilized in the purchase price
allocation was $6.09375, which represents the average market prices prior to
and after the public announcement of the proposed merger.
 
Note 2. Pro Forma Adjustments
 
 Pro Forma Balance Sheet
 
  (a)  To reverse Snyder's historical property, plant and equipment,
       accumulated depletion, depreciation and amortization and shareholders'
       equity as a result of the application of purchase accounting and to
       adjust long-term debt to fair market value.
 
  (b)  To record the preliminary pro forma allocation of the purchase price of
       the merger of Snyder to property, plant and equipment using the purchase
       method of accounting. The total of the value of the 68.4 million shares
       issued ($416.8 million), the fair value of the net liabilities assumed
       ($194.7 million, which is the remainder of liabilities assumed minus
       assets acquired) and the value of certain liabilities incurred as a
       result of the merger has been allocated to property, plant and equipment
       as follows:
<TABLE>
<CAPTION>
                                                                     In Millions
                                                                     -----------
      <S>                                                            <C>
      Common stock issued...........................................   $416.8
      Other accrued merger costs....................................      6.0
                                                                       ------
          Sub-total.................................................    422.8
      Liabilities assumed:
        Current liabilities.........................................     80.8
        Long-term debt at fair value................................    171.0
        Other long-term obligations.................................     19.1
      Assets acquired:
        Current assets..............................................    (38.4)
        Investments.................................................    (34.3)
                                                                       ------
      Allocated to property, plant and equipment....................   $621.0
                                                                       ======
</TABLE>
 
    Other accrued merger costs include those capitalizable costs incurred
    to consummate the transaction, consisting primarily of professional
    fees. These costs, along with the write off of certain lease
    obligations ($3.5 million) are reflected in current liabilities on the
    pro forma balance sheet. Management is in the process of assessing and
    formulating its integration plans, which are expected to include
    employee separations, employee relocations, elimination of duplicative
    facilities and other restructuring actions. These restructuring costs
    are anticipated to qualify as assumed liabilities in the merger upon
    finalization of these plans. Such amounts cannot be estimated at this
    time.
 
    In addition, Santa Fe has recorded a $124.5 million deferred tax
    liability related to the difference between the book basis and the tax
    basis in the oil and gas properties acquired. Such amount is allocated
    to property, plant and equipment.
 
  (c)  As a result of the merger, certain restricted stock and phantom unit
       awards of Santa Fe will vest, resulting in a charge to earnings, net of
       tax, of the unrecognized portion of such awards.
 
                                      F-6
<PAGE>
 
                        SANTA FE ENERGY RESOURCES, INC.
 
     NOTES TO UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS--
                                  (Continued)
 
 
 Pro Forma Statements of Operations
 
   Certain reclassification adjustments to line items were made to the Snyder
statements of operations to conform to Santa Fe's presentation. The material
adjustment made was a reclassification of production taxes ($5.5 million and
$12.9 million for the nine months ended September 30, 1998 and the year ended
December 31, 1997, respectively) from production and operating expense to taxes
other than income taxes. These adjustments do not affect net income and are not
presented on the pro forma statements.
 
  (a)  As a result of Santa Fe's spin-off of Monterey and Snyder's sale of
       Patina, management believes that the consolidated results for 1997 are
       not representative of the companies' on-going operations. Consequently,
       in order to provide investors with more relevant information, the
       following unaudited pro forma statement of operations was derived from
       the historical consolidated financial statements of Santa Fe and Snyder,
       incorporated herein by reference, and adjusted for the exclusion of
       Monterey and Patina.
 
 
                  UNAUDITED PRO FORMA STATEMENT OF OPERATIONS
                    (In Millions, Except Per Share Amounts)
 
<TABLE>
<CAPTION>
                                       Year Ended December 31, 1997
                            -----------------------------------------------------
                                              Santa Fe                   Snyder
                                              Excluding                 Excluding
                            Santa Fe Monterey Monterey  Snyder  Patina   Patina
                            -------- -------- --------- ------  ------  ---------
<S>                         <C>      <C>      <C>       <C>     <C>     <C>
Revenues..................   $514.7   $181.2   $333.5   $214.2  $73.3    $140.9
Costs and expenses:
  Production and
   operating..............    158.9     71.3     87.6     35.6    8.6      27.0
  Cost of gas and
   transportation.........       --       --       --      6.7     --       6.7
  Cost of crude oil
   purchased..............     22.0     22.0       --       --     --        --
  Exploration, including
   dry hole costs.........     49.1      0.9     48.2     17.0     --      17.0
  Depletion, depreciation
   and amortization.......    127.8     22.3    105.5     79.9   36.3      43.6
  Impairment of oil and
   gas properties.........       --       --       --      7.3     --       7.3
  General and
   administrative.........     28.1      7.6     20.5     20.4    3.9      16.5
  Taxes other than
   income.................     21.6      6.9     14.7     13.2    4.9       8.3
  Loss (gain) on sales of
   equity interests in
   investees..............       --       --       --    (32.8)    --     (32.8)
  Loss (gain) on
   disposition of assets..     (3.6)      --     (3.6)   (14.1)    --     (14.1)
                             ------   ------   ------   ------  -----    ------
   Total costs and
    expenses..............    403.9    131.0    272.9    133.2   53.7      79.5
                             ------   ------   ------   ------  -----    ------
Income from operations....    110.8     50.2     60.6     81.0   19.6      61.4
  Interest expense, net...    (17.1)   (10.7)    (6.4)   (26.2) (12.5)    (13.7)
  Other income (expense)..      1.9      1.0      0.9      2.6    0.7       1.9
                             ------   ------   ------   ------  -----    ------
Income before income
 taxes, minority interest
 and extraordinary item...     95.6     40.5     55.1     57.4    7.8      49.6
  Income tax (expense)
   benefit................    (36.2)   (16.3)   (19.9)   (17.9)    --     (17.9)
                             ------   ------   ------   ------  -----    ------
Income before minority
 interest and
 extraordinary item.......     59.4     24.2     35.2     39.5    7.8      31.7
  Minority interest.......     (4.7)    (4.7)      --     (4.1)  (3.5)     (0.6)
                             ------   ------   ------   ------  -----    ------
Income before
 extraordinary item.......     54.7     19.5     35.2     35.4    4.3      31.1
  Preferred dividend
   requirement............     (3.6)      --     (3.6)    (6.0)    --      (6.0)
  Convertible preferred
   premium................     (8.4)      --     (8.4)      --     --        --
                             ------   ------   ------   ------  -----    ------
Earnings before
 extraordinary item
 attributable to common
 shares...................   $ 42.7   $ 19.5   $ 23.2   $ 29.4  $ 4.3    $ 25.1
                             ======   ======   ======   ======  =====    ======
Earnings per common share
 before extraordinary item
  Basic...................   $ 0.43            $ 0.24   $ 0.96           $ 0.82
  Diluted.................   $ 0.43            $ 0.24   $ 0.95           $ 0.81
Weighted average number of
 shares outstanding
  Basic...................     98.6              98.6     30.6             30.6
                             ======            ======   ======           ======
  Diluted.................    100.6             100.6     31.1             31.1
                             ======            ======   ======           ======
</TABLE>
 
                                      F-7
<PAGE>
 
                        SANTA FE ENERGY RESOURCES, INC.
 
                NOTES TO UNAUDITED PRO FORMA CONDENSED COMBINED
                       FINANCIAL STATEMENTS--(Continued)
 
(b) To record the additional depletion, depreciation and amortization expense
    of $34.5 million, and $32.1 million related to the excess of the estimated
    fair value over the historical basis of the property, plant and equipment
    for the twelve months ended December 31, 1997 and the nine months ended
    September 30, 1998, respectively.
 
(c) To record income taxes at an effective rate of 35%.
 
 
                                      F-8
<PAGE>
 
                                                                         ANNEX A
 
 
                          AGREEMENT AND PLAN OF MERGER
 
                                  dated as of
 
                                January 13, 1999
 
                                    between
 
                             SNYDER OIL CORPORATION
 
                                      and
 
                        SANTA FE ENERGY RESOURCES, INC.
<PAGE>
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
                                   ARTICLE I
 
                                   The Merger
 
<S>                                                                         <C>
Section 1.01 The Merger....................................................   1
Section 1.02 Tax Treatment.................................................   2
Section 1.03 Accounting Treatment..........................................   2
Section 1.04 Conversion of Shares..........................................   2
Section 1.05 Surrender and Payment.........................................   2
Section 1.06 Stock Options.................................................   4
Section 1.07 Fractional Shares.............................................   5
Section 1.08 Withholding Rights............................................   6
Section 1.09 Lost Certificates.............................................   6
Section 1.10 Closing.......................................................   6
 
                                   ARTICLE II
 
                           The Surviving Corporation
 
Section 2.01 Certificate of Incorporation..................................   6
Section 2.02 Bylaws........................................................   7
Section 2.03 Directors and Officers........................................   7
 
                                  ARTICLE III
 
                     Representations and Warranties of SOCO
 
Section 3.01 Corporate Existence and Power.................................   7
Section 3.02 Corporate Authorization.......................................   8
Section 3.03 Governmental Authorization....................................   8
Section 3.04 Non-contravention.............................................   8
Section 3.05 Capitalization................................................   9
Section 3.06 Subsidiaries..................................................   9
Section 3.07 SEC Filings...................................................  10
Section 3.08 Financial Statements..........................................  11
Section 3.09 Absence of Certain Changes....................................  11
Section 3.10 No Undisclosed Material Liabilities...........................  13
Section 3.11 Compliance with Laws and Court Orders.........................  13
Section 3.12 Litigation....................................................  14
Section 3.13 Advisor's Fees................................................  14
Section 3.14 Taxes.........................................................  14
Section 3.15 Employee Benefit Plans........................................  15
Section 3.16 Environmental Matters.........................................  17
Section 3.17 Tax Treatment.................................................  18
Section 3.18 Opinion of Financial Advisor..................................  19
Section 3.19 Patents and Other Proprietary Rights..........................  19
Section 3.20 Status and Operation of Oil and Gas Properties ...............  20
Section 3.21 Reserve Reports...............................................  21
Section 3.22 Antitakeover Statutes and Rights Agreement....................  21
Section 3.23 Required Stockholder Vote or Consent..........................  22
Section 3.24 Hedging.......................................................  22
Section 3.25 Year 2000 Issues..............................................  22
</TABLE>
 
                                       i
<PAGE>
 
<TABLE>
<CAPTION>
                                                                          Page
                                                                          ----
 
                                   ARTICLE IV
 
                   Representations and Warranties of Santa Fe
 
<S>                                                                       <C>
Section 4.01 Corporate Existence and Power...............................  22
Section 4.02 Corporate Authorization.....................................  22
Section 4.03 Governmental Authorization..................................  23
Section 4.04 Non-contravention...........................................  23
Section 4.05 Capitalization..............................................  24
Section 4.06 Subsidiaries................................................  24
Section 4.07 SEC Filings.................................................  25
Section 4.08 Financial Statements........................................  26
Section 4.09 Absence of Certain Changes..................................  26
Section 4.10 No Undisclosed Material Liabilities.........................  28
Section 4.11 Compliance with Laws and Court Orders.......................  28
Section 4.12 Litigation..................................................  28
Section 4.13 Advisors' Fees..............................................  29
Section 4.14 Taxes.......................................................  29
Section 4.15 Employee Benefit Plans......................................  29
Section 4.16 Environmental Matters.......................................  31
Section 4.17 Tax Treatment...............................................  32
Section 4.18 Opinion of Financial Advisor................................  33
Section 4.19 Patents and Other Proprietary Rights........................  33
Section 4.20 Status and Operation of Oil and Gas Properties..............  34
Section 4.21 Reserve Reports.............................................  34
Section 4.22 Antitakeover Statutes and Rights Agreement..................  35
Section 4.23 Required Stockholder Vote or Consent........................  35
Section 4.24 Hedging.....................................................  35
Section 4.25 Year 2000 Issues............................................  35
 
                                   ARTICLE V
 
                       Conduct of Business Pending Merger
 
Section 5.01 Conduct of SOCO ............................................  35
Section 5.02 Conduct of Santa Fe.........................................  37
 
                                   ARTICLE VI
 
                             Additional Agreements
 
Section 6.01 Access and Information......................................  39
Section 6.02 Acquisition Proposals.......................................  39
Section 6.03 Directors' and Officers' Indemnification and Insurance......  41
Section 6.04 Fees and Expenses...........................................  42
Section 6.05 Cooperation.................................................  44
Section 6.06 Filings.....................................................  44
Section 6.07 Consents....................................................  44
Section 6.08 Board, Committees and Executive Officers....................  44
Section 6.09 Stockholder Meetings........................................  45
Section 6.10 Preparation of the Proxy Statement/Prospectus and
 Registration Statement .................................................  46
Section 6.11 Stock Exchange Listing......................................  48
</TABLE>
 
 
                                       ii
<PAGE>
 
<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
Section 6.12 Employee Benefits.............................................  48
Section 6.13 Reasonable Commercial Efforts.................................  49
Section 6.14 Certain Filings...............................................  49
Section 6.15 Public Announcements..........................................  50
Section 6.16 Further Assurances............................................  50
Section 6.17 Notices of Certain Events.....................................  50
Section 6.18 Tax-free Reorganization.......................................  50
Section 6.19 Affiliates....................................................  50
Section 6.20 Stockholder Litigation........................................  51
Section 6.21 Indenture Matters.............................................  51
 
                                  ARTICLE VII
 
                            Conditions to the Merger
 
Section 7.01 Conditions to the Obligations of Each Party...................  51
Section 7.02 Conditions to the Obligations of Santa Fe.....................  51
Section 7.03 Conditions to the Obligations of SOCO.........................  52
 
                                  ARTICLE VIII
 
                                  Termination
 
Section 8.01 Termination...................................................  53
Section 8.02 Effect of Termination.........................................  55
 
                                   ARTICLE IX
 
                                 Miscellaneous
 
Section 9.01 Notices.......................................................  55
Section 9.02 Survival of Representations and Warranties....................  56
Section 9.03 Amendments; No Waivers........................................  56
Section 9.04 Successors and Assigns........................................  57
Section 9.05 Governing Law.................................................  57
Section 9.06 Jurisdiction..................................................  57
Section 9.07 Waiver of Jury Trial..........................................  57
Section 9.08 Attorneys' Fees...............................................  57
Section 9.09 No Third Party Beneficiaries..................................  57
Section 9.10 Disclosure Schedule...........................................  58
Section 9.11 Counterparts; Effectiveness...................................  58
Section 9.12 Entire Agreement..............................................  58
Section 9.13 Captions......................................................  58
Section 9.14 Severability..................................................  58
Section 9.15 Definitions and Usage.........................................  58
</TABLE>
 
EXHIBITS
 
Exhibit A--Form of Affiliate Letter
Exhibit 6.08(b)--Surviving Corporation Executive Officers
 
                                      iii
<PAGE>
 
                          AGREEMENT AND PLAN OF MERGER
 
   This AGREEMENT AND PLAN OF MERGER, dated as of January 13, 1999
("Agreement"), is by and between Snyder Oil Corporation, a Delaware corporation
("SOCO"), and Santa Fe Energy Resources, Inc., a Delaware corporation ("Santa
Fe").
 
                                R E C I T A L S:
 
   WHEREAS, the respective Board of Directors of SOCO and Santa Fe deem it
advisable and in the best interests of their respective stockholders that on
the terms and subject to the conditions set forth herein, SOCO and Santa Fe
effect a strategic combination of their companies, such combination to be
effected by a merger of SOCO with and into Santa Fe (the "Merger"), and such
Boards of Directors have approved the Merger and recommended that their
respective stockholders approve and adopt this Agreement; and
 
   WHEREAS, for federal income tax purposes, SOCO and Santa Fe intend that the
Merger will qualify as a reorganization under the provisions of Section 368(a)
of the Internal Revenue Code of 1986, as amended (the "Code");
 
   NOW, THEREFORE, in consideration of the mutual representations, warranties,
covenants and agreements set forth herein, the parties hereto agree as follows:
 
                                   ARTICLE I
 
                                   The Merger
 
   Section 1.01 The Merger. (a) Upon the terms and subject to the conditions
hereof, at the Effective Time (as defined herein), SOCO shall merge with and
into Santa Fe in accordance with the General Corporation Law of the State of
Delaware ("DGCL"), whereupon the separate existence of SOCO shall cease, and
Santa Fe shall be the surviving corporation (the "Surviving Corporation"). The
Merger shall have the effects set forth in Section 259 of the DGCL, including,
without limitation, the Surviving Corporation's succession to and assumption of
all rights and obligations of SOCO.
 
   (b) As soon as practicable after satisfaction or, to the extent permitted
hereunder, waiver of all conditions to the Merger set forth herein Santa Fe
will file a certificate of merger (the "Certificate of Merger") with the
Delaware Secretary of State and make all other filings or recordings required
by Delaware Law in connection with the Merger. The Merger shall become
effective at such time (the "Effective Time") as the Certificate of Merger is
duly filed with the Delaware Secretary of State (or at such later time as may
be agreed in writing by the parties hereto and specified in the Certificate of
Merger).
 
   (c) From and after the Effective Time, the Surviving Corporation shall
possess all the rights, assets, powers, privileges and franchises and be
subject to all of the obligations, liabilities, restrictions and disabilities
of Santa Fe and SOCO, all as provided under the DGCL.
 
   Section 1.02 Tax Treatment. It is intended that the Merger shall constitute
a reorganization under Section 368(a) of the Code (a "368 Reorganization").
 
   Section 1.03 Accounting Treatment. It is intended that the Merger shall be
accounted for as a purchase transaction for financial accounting purposes.
 
                                      A-1
<PAGE>
 
   Section 1.04 Conversion of Shares. At the Effective Time, by virtue of the
Merger and without any action on the part of the holders of any capital stock
described below:
 
     (a) Each share of common stock, par value $0.01 per share, of SOCO,
  including, without limitation, all of the associated preferred stock
  purchase rights (the "SOCO Common Stock"), issued and outstanding
  immediately prior to the Effective Time shall (except as otherwise provided
  in this Section 1.04 and Section 1.07) be converted into the right to
  receive 2.05 shares (the "Exchange Ratio") of common stock, par value $0.01
  per share, and a corresponding number of preferred stock purchase rights
  issued under the Santa Fe Plan (as defined in the Santa Fe Plan) of Santa
  Fe (collectively "Santa Fe Common Stock"). All such SOCO Common Stock, when
  so converted, shall cease to be outstanding and shall automatically be
  canceled and retired and shall cease to exist, and the holder of a
  certificate ("SOCO Stock Certificate") that, immediately prior to the
  Effective Time, represented outstanding shares of SOCO Common Stock shall
  cease to have any rights with respect thereto, except the right to receive,
  upon the surrender of such SOCO Stock Certificate, the Santa Fe Common
  Stock (the "Merger Consideration") to which such holder is entitled
  pursuant to this Section 1.04(a), without interest. Until surrendered as
  contemplated by Section 1.05, each SOCO Stock Certificate shall be deemed
  at any time after the Effective Time to represent only the right to receive
  upon such surrender the Merger Consideration as contemplated by this
  Section 1.04.
 
     (b) Each share of SOCO Common Stock held by SOCO as treasury stock or
  owned by Santa Fe or any of its subsidiaries immediately prior to the
  Effective Time shall be canceled, and no payment shall be made with respect
  thereto.
 
     (c) Each share of Santa Fe Common Stock issued and outstanding
  immediately prior to the Effective Time shall not be affected by the
  Merger.
 
   Section 1.05 Surrender and Payment. (a) Prior to the Effective Time, Santa
Fe shall appoint an agent, which shall be Santa Fe's Transfer Agent or such
other person or persons reasonably satisfactory to SOCO (the "Exchange Agent"),
for the purpose of exchanging SOCO Stock Certificates for the Merger
Consideration. As of the Effective Time, Santa Fe will make available to the
Exchange Agent, as needed, the Merger Consideration to be paid in respect of
shares of SOCO Common Stock for exchange in accordance with this Section 1.05
through the Exchange Agent. Promptly after the Effective Time, but in any event
not later than five business days thereafter, Santa Fe will send, or will cause
the Exchange Agent to send, to each holder of shares of SOCO Common Stock at
the Effective Time a letter of transmittal and instructions for use in
effecting such exchange (which shall specify that the delivery shall be
effected, and risk of loss and title shall pass, only upon proper delivery of
the SOCO Stock Certificates to the Exchange Agent). Provision also shall be
made for holders of SOCO Stock Certificates to procure in person immediately
after the Effective Time a letter of transmittal and instructions and to
deliver in person immediately after the Effective Time such letter of
transmittal and SOCO Stock Certificates in exchange for the Merger
Consideration.
 
   (b) Each holder of shares of SOCO Common Stock that have been converted into
the right to receive the Merger Consideration will be entitled to receive, upon
surrender to the Exchange Agent of a SOCO Stock Certificate, together with a
properly completed letter of transmittal and pursuant to irrevocable
instructions, the Merger Consideration in respect of the SOCO Common Stock
represented by such certificate.
 
   (c) If any portion of the Merger Consideration is to be paid to a person (as
defined in Section 9.15) other than the person in whose name the SOCO Stock
Certificate is registered, it shall be a condition to such payment that the
SOCO Stock Certificate so surrendered shall be properly endorsed or otherwise
be in proper form for transfer and that the person requesting such payment
shall pay to the Exchange Agent any transfer or other taxes required as a
result of such payment to a person other than the registered holder of such
SOCO Stock Certificate or establish to the satisfaction of the Exchange Agent
that such tax has been paid or is not payable.
 
                                      A-2
<PAGE>
 
   (d) After the Effective Time, the stock transfer books of SOCO shall be
closed and there shall be no further registration of transfers of shares of
SOCO Common Stock outstanding prior to the Effective Time. If, after the
Effective Time, SOCO Stock Certificates are presented to the Surviving
Corporation, they shall be canceled and exchanged for the consideration
provided for, and in accordance with the procedures set forth, in this Article.
 
   (e) Any portion of the Merger Consideration made available to the Exchange
Agent pursuant to Section 1.05(a) that remains unclaimed by the holders of
shares of SOCO Common Stock six months after the Effective Time shall be
returned to Santa Fe, upon demand, and any such holder who has not exchanged
shares of SOCO Common Stock for the Merger Consideration in accordance with
this Section prior to that time shall thereafter look only to Santa Fe for
payment of the Merger Consideration in respect of such shares of SOCO Common
Stock. Notwithstanding the foregoing, Santa Fe shall not be liable to any
holder of shares of SOCO Common Stock for any amount paid to a public official
pursuant to applicable abandoned property laws. Any amounts remaining unclaimed
by holders of shares of SOCO Common Stock six years after the Effective Time
(or such earlier date immediately prior to such time as such amounts would
otherwise escheat to or become property of any governmental entity) shall, to
the extent permitted by applicable law, become the property of Santa Fe free
and clear of any claims or interest of any person previously entitled thereto.
 
   (f) No dividends or other distributions with respect to securities of Santa
Fe constituting part of the Merger Consideration shall be paid to the holder of
any unsurrendered SOCO Stock Certificates until such SOCO Stock Certificates
are surrendered as provided in this Section 1.05. Upon such surrender, there
shall be paid, without interest, to the person in whose name the securities of
Santa Fe have been registered, all dividends and other distributions payable in
respect of such securities on a date subsequent to, and in respect of a record
date after, the Effective Time.
 
   Section 1.06 Stock Options. (a) At the Effective Time, automatically and
without any action on the part of the holder thereof, each option to purchase
shares of SOCO Common Stock outstanding under any stock option or compensation
plan or other arrangement of SOCO, whether or not exercisable, and whether or
not vested ("SOCO Stock Options"), shall be canceled pursuant to its terms.
With respect to SOCO Stock Options so canceled at the Effective Time that were
held by (i) employees or directors of SOCO who continue with the Surviving
Corporation after the Effective Time or (ii) former employees of SOCO with
severance or employment agreements that provide for an extended period to
exercise such SOCO Stock Option or non-employee directors of SOCO who do not
continue in office with the Surviving Corporation, Santa Fe shall grant such
holder an option immediately following the Effective Time to purchase that
number of shares of Santa Fe Common Stock ("Santa Fe Stock Options") equal to
the product of the number of shares of SOCO Common Stock subject to issuance
upon exercise of such option times the Exchange Ratio and with an exercise
price equal to the exercise price per share of such SOCO Stock Option divided
by the Exchange Ratio, and otherwise upon the same terms and conditions as are
set forth in such SOCO Stock Option or severance agreement, including, but not
limited to, the existing terms of such SOCO Stock Option; provided, however,
that (i) the exercise price, the number of shares of Santa Fe Common Stock
purchasable upon exercise of such Santa Fe Stock Option and the terms and
conditions of exercise of such option shall comply with Section 424(a) of the
Code, without regard to whether Section 421 of the Code applied to such
canceled SOCO Stock Option, and (ii) each such Santa Fe Stock Option shall be
fully exercisable on its grant. Notwithstanding the foregoing, any SOCO
employee who receives a Santa Fe Agreement pursuant to Section 6.12(c) and
whose employment terminates with the Surviving Corporation during the two-year
period following the Effective Time for any reason other than such employment
being involuntarily terminated pursuant to a written notice of termination by
the Surviving Corporation shall be entitled either to receive in cash the
positive spread (if any) between the then current market price of the Common
Stock of the Surviving Corporation and the exercise price of such option, or to
elect to exercise such option for a period of up to 90 days following such
termination or the remaining term of such option, whichever is shorter. Any
option that is unexercised or is not cashed out following such period shall be
canceled. For purposes of such option "Good Reason" termination, as defined in
the Santa Fe change in control agreement shall be deemed to be a voluntary
termination. If, and
 
                                      A-3
<PAGE>
 
only if, such a former SOCO employee is involuntarily terminated during the
two-year period following the Effective Time, pursuant to a written notice of
termination by the Surviving Corporation, such employee shall have a period of
three years following such involuntary termination or the period of time of the
remaining term of such option, whichever is shorter, in which to exercise such
option. To the extent reasonably practicable, with respect to a canceled SOCO
Stock Option that was an incentive stock option for purposes of Section 422 of
the Code, the replacement Santa Fe Stock Option shall be designed to constitute
an incentive stock option. Prior to the Effective Time, SOCO will use all
commercially reasonable efforts to obtain such consents, if any, as may be
necessary to give effect to the transactions contemplated by this Section 1.06.
In addition, prior to the Effective Time, SOCO will, to the extent commercially
reasonable and permitted by the relevant stock option agreements, make any
amendments to the terms of such stock option or compensation plans or
arrangements that are necessary to give effect to the transactions contemplated
by this Section 1.06. Except as contemplated by this Section 1.06, SOCO will
not, after the date hereof, without the written consent of Santa Fe, grant any
new options or amend any outstanding options to purchase shares of SOCO Common
Stock (including accelerating the vesting).
 
   (b) Santa Fe shall take all corporate actions necessary to reserve for
issuance a sufficient number of shares of Santa Fe Common Stock for delivery
upon exercise of the Santa Fe Stock Options granted by Santa Fe pursuant to
Section 1.06(a) above. As promptly as practicable after the Effective Time,
Santa Fe shall file a Registration Statement on Form S-8 (or any successor or
other appropriate forms) with respect to the shares of Santa Fe Common Stock
subject to such Santa Fe Stock Options and shall use all reasonable commercial
efforts to maintain the effectiveness of such registration statement or
registration statements (and maintain the current status of the prospectus or
prospectuses contained therein) for so long as such options remain outstanding.
 
   Section 1.07 Fractional Shares. No fractional shares of Santa Fe Common
Stock shall be issued in the Merger, but in lieu thereof each holder of SOCO
Common Stock otherwise entitled to a fractional share of Santa Fe Common Stock
will be entitled to receive, from the Exchange Agent in accordance with the
provisions of this Section 1.07, a cash payment in lieu of such fractional
shares of Santa Fe Common Stock representing such holder's proportionate
interest, if any, in the net proceeds from the sale by the Exchange Agent in
one or more transactions (which sale transactions shall be made at such times,
in such manner and on such terms as the Exchange Agent shall determine in its
reasonable discretion) on behalf of all such holders of the aggregate of the
fractional shares of Santa Fe Common Stock which would otherwise have been
issued (the "Excess Shares"). The sale of the Excess Shares by the Exchange
Agent shall be executed on the New York Stock Exchange ("NYSE") through one or
more member firms of the NYSE and shall be executed in round lots to the extent
practicable. Until the net proceeds of such sale or sales have been distributed
to the holders of SOCO Common Stock, the Exchange Agent will hold such proceeds
in trust for the holders of SOCO Common Stock. Santa Fe shall pay all
commissions, transfer taxes and other out-of-pocket transaction costs,
including, without limitation, the expenses and compensation of the Exchange
Agent, incurred in connection with such sale or sales. As soon as practicable
after the determination of the amount of cash, if any, to be paid to holders of
SOCO Common Stock in lieu of any fractional shares of Santa Fe Common Stock,
the Exchange Agent shall make available such amounts to such holders, without
interest.
 
   Section 1.08 Withholding Rights. The Surviving Corporation shall be entitled
to deduct and withhold from the consideration otherwise payable to any person
pursuant to this Article I such amounts as it is required to deduct and
withhold with respect to the making of such payment under any provision of
federal, state, local or foreign tax law. To the extent that amounts are so
withheld by the Surviving Corporation, such withheld amounts shall be treated
for all purposes of this Agreement as having been paid to the holder of the
shares of SOCO Common Stock in respect of which such deduction and withholding
was made by the Surviving Corporation.
 
   Section 1.09 Lost Certificates. If any SOCO Stock Certificate shall have
been lost, stolen or destroyed, upon the making of an affidavit of that fact by
the person claiming such SOCO Stock Certificate to be lost,
 
                                      A-4
<PAGE>
 
stolen or destroyed and, if required by the Surviving Corporation, the posting
by such person of a bond, in such reasonable amount as the Surviving
Corporation may direct, as indemnity against any claim that may be made against
it with respect to such SOCO Stock Certificate, the Exchange Agent will issue
in exchange for such lost, stolen or destroyed SOCO Stock Certificate the
Merger Consideration to be paid in respect of the shares of SOCO Common Stock
represented by such SOCO Stock Certificates as contemplated by this Article I.
 
   Section 1.10 Closing. The closing of the transactions contemplated by this
Agreement (the "Closing") shall take place at the offices of Andrews & Kurth
L.L.P., 600 Travis, Suite 4200, Houston, Texas 77002 at 10:00 a.m., local time,
on the first business day immediately following the date on which all of the
conditions set forth in Article VII hereof are satisfied or waived, or at such
other date and time as Santa Fe and SOCO shall otherwise agree (the "Closing
Date").
 
                                   ARTICLE II
 
                           The Surviving Corporation
 
   Section 2.01 Certificate of Incorporation. The certificate of incorporation
of Santa Fe, as amended and in effect immediately prior to the Effective Time
(the "Charter"), shall be the certificate of incorporation of the Surviving
Corporation until amended in accordance with applicable law, provided that, as
of the Effective Time, such Charter shall be amended as follows:
 
     (a) Article FIRST of the Charter shall be amended to read in its
  entirety as follows:
 
       "FIRST: The name of the corporation (hereinafter referred to as the
    "Corporation") is Santa Fe Snyder Corporation."
 
     (b) The first paragraph of Article FOURTH of the Charter shall be
  amended to read in its entirety as follows:
 
       "FOURTH: The total number of shares of all classes of capital stock
    which the Corporation shall have authority to issue is 350,000,000, of
    which 50,000,000 shares shall be Preferred Stock, par value $.01 per
    share, and 300,000,000 shares shall be Common Stock, par value $.01 per
    share."
 
     (c) The certificate of designations for Santa Fe's Series A Junior
  Participating Preferred Stock shall be amended to increase to 3,000,000 the
  number of shares of Junior Preferred Stock subject to such designation.
 
   Section 2.02 Bylaws. The bylaws of Santa Fe in effect immediately prior to
the Effective Time shall be the bylaws of the Surviving Corporation until
amended in accordance with applicable law.
 
   Section 2.03 Directors and Officers. From and after the Effective Time,
until successors are duly elected or appointed and qualified or until their
earlier death, resignation or removal in accordance with the Surviving
Corporation's certificate of incorporation and bylaws, the directors and
executive officers of the Surviving Corporation shall be as set forth in
Section 6.08.
 
                                  ARTICLE III
 
                     Representations and Warranties of SOCO
 
   SOCO represents and warrants to Santa Fe that, except as disclosed in the
SOCO Schedule of Exceptions (the "SOCO Schedule"), as of the date hereof:
 
   Section 3.01 Corporate Existence and Power. SOCO is a corporation duly
incorporated, validly existing and in good standing under the laws of the State
of Delaware and has all corporate powers and all governmental licenses,
authorizations, permits, consents and approvals required to carry on its
business as now
 
                                      A-5
<PAGE>
 
conducted, except for those licenses, authorizations, permits, consents and
approvals the absence of which would not, individually or in the aggregate,
have a SOCO Material Adverse Effect (as defined in Section 3.06). SOCO is duly
qualified to do business as a foreign corporation and is in good standing in
each jurisdiction specified in Section 3.01 of the SOCO Schedule, which are the
only jurisdictions where such qualification is necessary or appropriate, except
for those jurisdictions where failure to be so qualified would not,
individually or in the aggregate, have a SOCO Material Adverse Effect. SOCO has
heretofore delivered to Santa Fe true and complete copies of the certificate of
incorporation and bylaws of SOCO as currently in effect, and SOCO's certificate
of incorporation and bylaws as so delivered are in full force and effect. SOCO
is not in default in any respect in the performance, observation or fulfillment
of any provision of its certificate of incorporation or bylaws.
 
   Section 3.02 Corporate Authorization. (a) The execution, delivery and
performance by SOCO of this Agreement and the consummation of the transactions
contemplated hereby are within SOCO's corporate powers and, except for the
required approval of SOCO's stockholders in connection with the consummation of
the Merger, have been duly authorized by all necessary corporate action. The
affirmative vote of the holders of a majority of the outstanding shares of SOCO
Common Stock is the only vote of the holders of any of SOCO's capital stock
necessary in connection with the consummation of the Merger. No other vote of
the holders of SOCO's capital stock is necessary in connection with this
Agreement or the consummation of the transactions contemplated hereby. This
Agreement has been duly and validly executed and delivered by SOCO and
constitutes a valid and binding agreement of SOCO.
 
   (b) SOCO's Board of Directors, at a meeting duly called and held, has (i)
determined that this Agreement and the transactions contemplated hereby
(including, without limitation, the Merger) are fair to and in the best
interests of SOCO's stockholders, (ii) approved and adopted this Agreement and
the transactions contemplated hereby (including, without limitation, the
Merger), and (iii) recommended approval and adoption of this Agreement by its
stockholders.
 
   Section 3.03 Governmental Authorization. The execution, delivery and
performance by SOCO of this Agreement and the consummation by SOCO of the
transactions contemplated hereby require no action by or in respect of, or
filing with, any governmental body, agency, official or authority other than
(a) the filing of a certificate of merger in accordance with Delaware Law, (b)
compliance with any applicable requirements of the Hart-Scott-Rodino Antitrust
Improvements Act of 1976 ("HSR Act"), the Securities Act of 1933 ("1933 Act"),
the Securities Exchange Act of 1934 ("1934 Act"), state laws relating to
takeovers, if applicable, and foreign or state securities or Blue Sky laws, and
(c) any other filings, approvals or authorizations which are ministerial in
nature and are customarily obtained from governmental authorities after the
effective time in connection with transactions of the same nature as are
contemplated hereby ("Customary Post Closing Consents") or which, if not
obtained, would not, individually or in the aggregate, have a SOCO Material
Adverse Effect or materially impair the ability of SOCO to consummate the
transactions contemplated by this Agreement.
 
   Section 3.04 Non-contravention. The execution, delivery and performance by
SOCO of this Agreement and the consummation by SOCO of the transactions
contemplated hereby do not and will not (i) subject to obtaining the SOCO
Stockholders' Approval (as defined in Section 3.23), violate the certificate of
incorporation or bylaws of SOCO, or the certificate of incorporation or bylaws
(or similar organizational documents) of any of SOCO's subsidiaries, (ii)
assuming compliance with the matters referred to in Section 3.03, violate any
applicable law, rule, regulation, judgment, writ, injunction, order or decree,
(iii) require any consent or other action by any person under, give rise to any
right of first refusal or similar right of any third party under, constitute a
default under, or give rise to any right of termination, cancellation or
acceleration of any right or obligation of SOCO or any of its subsidiaries or
to guaranteed payments or a loss of any benefit to which SOCO or any of its
subsidiaries is entitled under any provision of any agreement or other
instrument binding upon SOCO or any of its subsidiaries or any license,
franchise, permit, certificate, approval or other similar authorization
affecting, or relating in any way to, the assets or business of SOCO or any of
its subsidiaries, (iv) result in the creation or imposition of any Lien on any
shares of capital stock or any material properties or
 
                                      A-6
<PAGE>
 
assets of SOCO or any of its subsidiaries, or (v) result in any holder of any
securities of SOCO being entitled to appraisal, dissenters' or similar rights,
except, in the case of clauses (ii), (iii) and (iv), for such matters as would
not, individually or in the aggregate, have a SOCO Material Adverse Effect or
materially impair the ability of SOCO to consummate the transactions
contemplated by this Agreement. "Lien" means, with respect to any property or
asset, any mortgage, lien, pledge, charge, security interest, encumbrance or
other adverse claim of any kind in respect of such property or asset.
 
   Section 3.05 Capitalization. The authorized capital stock of SOCO consists
of a total of 85,000,000 shares, of which 75,000,000 shares are SOCO Common
Stock and 10,000,000 shares are preferred stock, par value $0.01 per share, of
SOCO ("SOCO Preferred Stock"). No shares of SOCO Preferred Stock are issued or
outstanding, although a series of SOCO Preferred Stock consisting of 75,000
shares has been designated as Junior Participating Preferred Stock and is
subject to issuance under SOCO's Preferred Stock Purchase Rights Plan, dated as
of May 27, 1997 (the "SOCO Plan"). As of January 11, 1999, there were
33,364,567 shares of SOCO Common Stock issued and outstanding and options to
purchase an aggregate of 2,584,320 shares of SOCO Common Stock at an average
exercise price of $15.86 per share (of which 1,184,248 were exercisable). All
outstanding shares of capital stock of SOCO have been duly authorized and
validly issued and are fully paid and non-assessable. Except as set forth in
this Section 3.05 or in the SOCO Plan and except for changes since January 11,
1999 resulting from the exercise of employee or non-employee director stock
options outstanding on such date, there are no outstanding (i) shares of
capital stock or voting securities of SOCO, (ii) securities of SOCO convertible
into or exchangeable for shares of capital stock or voting securities of SOCO
or (iii) options or other rights to acquire from SOCO or other obligation of
SOCO to issue, any capital stock, voting securities or securities convertible
into or exchangeable for capital stock or voting securities of SOCO. There are
no outstanding obligations of SOCO or any of its subsidiaries to repurchase,
redeem or otherwise acquire any securities referred to in clauses (i), (ii) or
(iii) above. Except for any amendments filed with the SOCO SEC Filings (as
defined below) made prior to the date hereof, the SOCO Plan has not been
amended except to provide that the SOCO Plan is inapplicable to the execution
and delivery of this Agreement and the transactions contemplated hereby and any
other agreements executed and delivered in connection herewith. A "Distribution
Date" has not occurred within the meaning of the SOCO Plan, and the
consummation of the transactions contemplated hereby will not result in the
occurrence of a Distribution Date.
 
   Section 3.06 Subsidiaries. (a) SOCO has previously furnished Santa Fe with a
list of the name and jurisdiction of organization of each subsidiary (as
defined in Section 9.15) of SOCO, which list is true and correct. Each such
subsidiary is a corporation duly incorporated or an entity duly organized,
validly existing and in good standing under the laws of its jurisdiction of
incorporation or organization, as the case may be, has all corporate,
partnership or other entity derived powers and all governmental licenses,
authorizations, permits, consents and approvals required to carry on its
business as now conducted, except for those licenses, authorizations, permits,
consents and approvals the absence of which would not, individually or in the
aggregate, have a SOCO Material Adverse Effect. Each subsidiary of SOCO is duly
qualified to do business as a foreign corporation or entity, as the case may
be, and is in good standing in each jurisdiction where such qualification is
necessary, except for those jurisdictions where failure to be so qualified
would not, individually or in the aggregate, have a SOCO Material Adverse
Effect. SOCO has made available to Santa Fe a complete and correct copy of the
certificate of incorporation and bylaws (or similar organizational documents)
of each of SOCO's subsidiaries, each as amended to date, and the certificate of
incorporation and bylaws (or similar organizational documents) as so delivered
are in full force and effect. No SOCO subsidiary is in default in any respect
in the performance, observation or fulfillment of any provision of its
certificate of incorporation or bylaws (or similar organizational documents).
Other than SOCO's subsidiaries, its ownership of (i) 7,822,000 ordinary shares
of SOCO International plc ("International") (representing approximately 15.8%
of International's outstanding shares as reported as of June 30, 1998); (ii)
11,731,000 ordinary shares of Cairn Energy plc ("Cairn") (representing
approximately 6.9% of Cairn's outstanding shares as reported as of June 30,
1998); and (iii) 27% of Great Divide Gas Services, LLC, a Colorado limited
liability company; SOCO does not beneficially own or control, directly or
indirectly, 5% or more of any class of equity or similar securities of any
corporation or other organization, whether incorporated or unincorporated. For
purposes of this Agreement
 
                                      A-7
<PAGE>
 
a "SOCO Material Adverse Effect" shall mean any event, circumstance, condition,
development or occurrence causing, resulting in or having a material adverse
effect on the financial condition, business, assets, properties, prospects or
results of operations of SOCO and its subsidiaries, taken as a whole, provided
that such term shall not include effects on SOCO resulting from general
economic conditions or from market conditions (including, without limitation,
changes in the market prices for oil and gas) then prevailing generally in the
oil and gas industry.
 
   (b) All of the outstanding capital stock of, or other voting securities or
ownership interests in, each subsidiary of SOCO is owned by SOCO, directly or
indirectly, free and clear of any Lien and free of any other limitation or
restriction (including, without limitation, any restriction on the right to
vote, sell or otherwise dispose of such capital stock or other voting
securities or ownership interests), other than any restrictions imposed under
the 1933 Act. Except as set forth in this Section 3.06, there are no
outstanding (i) shares of capital stock or other voting securities or ownership
interests in any of SOCO's subsidiaries, (ii) securities of SOCO or any of its
subsidiaries convertible into or exchangeable for shares of capital stock or
other voting securities or ownership interests in any of SOCO's subsidiaries or
(iii) options or other rights to acquire from SOCO or any of its subsidiaries,
or other obligation of SOCO or any of its subsidiaries to issue, any capital
stock or other voting securities or ownership interests in, or any securities
convertible into or exchangeable for any capital stock or other voting
securities or ownership interests in, any of SOCO's subsidiaries. There are no
outstanding obligations of SOCO or any of its subsidiaries to repurchase,
redeem or otherwise acquire any of the securities referred to in clauses (i),
(ii) or (iii) of this Section 3.06(b).
 
   Section 3.07 SEC Filings. (a) SOCO has filed with the Securities and
Exchange Commission (the "SEC"), and has heretofore made available to Santa Fe
true and complete copies of, each form, registration statement, report,
schedule, proxy or information statement and other document (including, without
limitation, exhibits and amendments thereto), including, without limitation,
its Annual Reports to Stockholders incorporated by reference in certain of such
reports, required to be filed by it or its predecessors with the SEC since
December 31, 1995 under the 1933 Act or the 1934 Act (collectively, the "SOCO
SEC Filings").
 
   (b) As of its respective filing date (or, if any SOCO SEC Filing was
amended, as of the date such amendment was filed), each SOCO SEC Filing,
including, without limitation, any financial statements or schedules included
therein, complied as to form in all material respects with the applicable
requirements of the 1933 Act and the 1934 Act.
 
   (c) As of its filing date (or, if any SOCO SEC Filing was amended, as of the
date such amendment was filed), each SOCO SEC Filing filed pursuant to the 1934
Act did not contain any untrue statement of a material fact or omit to state
any material fact necessary in order to make the statements made therein, in
the light of the circumstances under which they were made, not misleading.
 
   (d) Each such registration statement, as amended or supplemented, if
applicable, filed by SOCO pursuant to the 1933 Act and constituting a SOCO SEC
Filing did not, as of the date such statement or amendment became effective,
contain any untrue statement of a material fact or omit to state any material
fact required to be stated therein or necessary to make the statements therein
not misleading.
 
   Section 3.08 Financial Statements. The audited consolidated financial
statements and unaudited consolidated interim financial statements of SOCO
included in the SOCO SEC Filings fairly present, in conformity with United
States generally accepted accounting principles ("GAAP") applied on a
consistent basis (except as may be indicated in the notes thereto), the
consolidated financial position of SOCO and its subsidiaries as of the dates
thereof and their consolidated results of operations and cash flows for the
periods then ended (subject to normal year-end adjustments and the absence of
financial footnotes in the case of any unaudited interim financial statements).
For purposes of this Agreement, "SOCO Balance Sheet" means the consolidated
balance sheet of SOCO as of September 30, 1998 set forth in the SOCO quarterly
report on Form 10-Q for the quarter ended September 30, 1998 and "SOCO Balance
Sheet Date" means September 30, 1998.
 
                                      A-8
<PAGE>
 
   Section 3.09 Absence of Certain Changes. Except as disclosed in the SOCO SEC
Filings made prior to the date hereof or as contemplated by this Agreement or
with respect to any of the actions referred to in any of clauses (b) through
(f) or (h) through (l) below to which Santa Fe has given its consent as
contemplated by Section 5.01, since the SOCO Balance Sheet Date, the business
of SOCO and its subsidiaries has been conducted in all material respects in the
ordinary course consistent with past practices and there has not been:
 
     (a) any event, occurrence, development or state of circumstances or
  facts which has had, individually or in the aggregate, a SOCO Material
  Adverse Effect;
 
     (b) any declaration, setting aside or payment of any dividend or other
  distribution with respect to any shares of capital stock of SOCO or any of
  its subsidiaries (other than dividends paid by direct or indirect wholly
  owned subsidiaries), or any repurchase, redemption or other acquisition by
  SOCO or any of its subsidiaries of any outstanding shares of capital stock
  or other securities of, or other ownership interests in, SOCO or any of its
  subsidiaries;
 
     (c) except for amendments to the SOCO Plan contemplated by Section 3.22,
  any amendment of any material term of any outstanding security of SOCO or
  any of its subsidiaries;
 
     (d) any incurrence, assumption or guarantee by SOCO or any of its
  subsidiaries of any material indebtedness for borrowed money other than
  trade debt incurred in the ordinary course and debt incurred pursuant to
  existing credit facilities and arrangements;
 
     (e) any creation or other incurrence by SOCO or any of its subsidiaries
  of any Lien on any material asset other than in the ordinary course
  consistent with past practices;
 
     (f) any making of any material loan, advance or capital contributions to
  or investment in any person other than loans, advances or capital
  contributions to or investments in wholly-owned subsidiaries of SOCO made
  in the ordinary course consistent with past practices;
 
     (g) any damage, destruction or other casualty loss affecting the
  business or assets of SOCO or any of its subsidiaries which, without
  considering the effect of any insurance, would, individually or in the
  aggregate, have a SOCO Material Adverse Effect;
 
     (h) except for sales of Hydrocarbons (as defined in Section 3.20)
  produced by SOCO and its subsidiaries in the ordinary course of business,
  any transaction or commitment made, or any contract or agreement entered
  into, by SOCO or any of its subsidiaries relating to its assets or business
  (including, without limitation, the acquisition or disposition of any
  assets) or any relinquishment by SOCO or any of its subsidiaries of any
  contract or other right, in either case, in excess of $10 million
  individually;
 
     (i) any change in any method of financial accounting or tax accounting
  or any accounting practice by SOCO or any of its subsidiaries, except for
  any such change required by reason of a change in GAAP or Regulation S-X
  promulgated under the 1934 Act;
 
     (j) any (i) grant of any severance or termination pay to (x) any
  employee of SOCO or any of its subsidiaries (other than officers (as
  defined in Section 9.15) or directors) other than ordinary course grants in
  amounts consistent with past practices or (y) any director or officer of
  SOCO or any of its subsidiaries, (ii) increase in benefits payable under
  any existing severance or termination pay policies or employment
  agreements, (iii) entering into of any employment, deferred compensation or
  other similar agreement (or any amendment to any such existing agreement)
  with any director, officer or employee of SOCO or any of its subsidiaries,
  (iv) establishment, adoption or amendment (except as required by applicable
  law) of any collective bargaining, bonus, profit sharing, thrift, pension,
  retirement, deferred compensation, compensation, stock option, restricted
  stock or other benefit plan or arrangement covering any director, officer,
  employee or former employee of SOCO or any of its subsidiaries, or (v)
  increase in compensation, bonus or other benefits payable to directors or
  officers other than ordinary course increases implemented prior to the date
  hereof consistent with past practices;
 
                                      A-9
<PAGE>
 
     (k) any material labor dispute, other than routine individual
  grievances, or, to the knowledge of SOCO, any activity or proceeding by a
  labor union or representative thereof to organize any material number of
  employees of SOCO or any of its subsidiaries, which employees were not
  subject to a collective bargaining agreement at the SOCO Balance Sheet
  Date, or any material lockouts, strikes, slowdowns, work stoppages or
  threats thereof by or with respect to such employees; or
 
     (l) any tax election, other than those consistent with past practice,
  not required by law or any settlement or compromise of any tax liability in
  either case that is material to SOCO and its subsidiaries, taken as a
  whole.
 
   Section 3.10 No Undisclosed Material Liabilities. There are no liabilities
of SOCO or any of its subsidiaries of any kind whatsoever, whether accrued,
contingent, absolute, determined, determinable or otherwise, and there is no
existing condition, situation or set of circumstances which could reasonably be
expected to result in such a liability, other than:
 
     (a) liabilities or obligations disclosed in the SOCO SEC Filings made
  prior to the date hereof or provided for in the SOCO Balance Sheet or
  disclosed in the notes thereto;
 
     (b) liabilities or obligations which would not, individually or in the
  aggregate, have a SOCO Material Adverse Effect; and
 
     (c) liabilities or obligations under this Agreement.
 
   Section 3.11 Compliance with Laws and Court Orders. SOCO and each of its
subsidiaries hold all approvals, licenses, permits, certificates, consents,
entitlements, plans, surveys, registrations and similar type authorizations
("Permits") necessary for the lawful conduct of its respective businesses, as
now conducted, except for Permits the lack of which, individually or in the
aggregate, would not have a SOCO Material Adverse Effect. Except as set forth
in the SOCO SEC Filings made prior to the date hereof, SOCO and each of its
subsidiaries is and has been in compliance with, and to the knowledge (as
defined in Section 9.15) of SOCO, is not under investigation with respect to
and has not been threatened to be charged with or given notice of any violation
of, any applicable law, rule, regulation, judgment, injunction, order or
decree, except for such matters as would not, individually or in the aggregate,
have a SOCO Material Adverse Effect; provided, however, notwithstanding the
foregoing, no representation or warranty in this Section 3.11 is made with
respect to Environmental Laws or Environmental Permits, which are covered
exclusively by the provisions set forth in Section 3.16.
 
   Section 3.12 Litigation. Except as set forth in the SOCO SEC Filings made
prior to the date hereof, there is no action, suit, investigation, audit or
proceeding pending against, or to the knowledge of SOCO threatened against or
affecting, SOCO or any of its subsidiaries or any of their respective
properties or any of the directors or officers of SOCO or any of its
subsidiaries in their capacity as such before any court or arbitrator or any
governmental body, agency or official which would, individually or in the
aggregate, have a SOCO Material Adverse Effect. Neither SOCO nor any of its
subsidiaries, nor any director or employee of SOCO or any of its subsidiaries,
has been permanently or temporarily enjoined by any order, judgment or decree
of any court or any other governmental authority from engaging in or continuing
any conduct or practice in connection with the business, assets or properties
of SOCO or such subsidiary nor, to the knowledge of SOCO, is SOCO, any
subsidiary or any officer, director or employee of SOCO or its subsidiaries
under investigation by any governmental authority. Except as disclosed in the
SOCO SEC Filings made prior to the date hereof, there is not in existence any
order, judgment or decree of any court or other tribunal or other agency
enjoining or requiring SOCO or any of its subsidiaries to take any action of
any kind with respect to its business, assets or properties, which would,
individually or in the aggregate, have a SOCO Material Adverse Effect.
Notwithstanding the foregoing, no representation or warranty in this Section
3.12 is made with respect to Environmental Laws, which are covered exclusively
by the provisions set forth in Section 3.16.
 
   Section 3.13 Advisor's Fees. Except for Petrie Parkman & Co., copies of
whose engagement agreements have been provided to Santa Fe, there is no
investment banker, broker, finder or other intermediary which has
 
                                      A-10
<PAGE>
 
been retained by or is authorized to act on behalf of SOCO or any of its
subsidiaries who might be entitled to any fee or commission in connection with
the transactions contemplated by this Agreement.
 
   Section 3.14 Taxes. (a) Except as set forth in the SOCO Balance Sheet
(including, without limitation, the notes thereto) and except as would not,
individually or in the aggregate, have a SOCO Material Adverse Effect, (i) all
tax returns, statements, reports and forms (collectively, the "SOCO Returns")
required to be filed with any taxing authority by, or with respect to, SOCO and
its subsidiaries and any partnerships of which SOCO or its subsidiaries is a
partner have been duly and timely filed in accordance with all applicable laws;
(ii) SOCO and its subsidiaries have timely paid all taxes due and payable,
whether or not shown on any SOCO Return, and the SOCO Returns correctly and
completely reflect the income, business, assets, operations, activities and the
status of SOCO and its subsidiaries (other than taxes which are being contested
in good faith and for which adequate reserves are reflected on the SOCO Balance
Sheet); (iii) SOCO and its subsidiaries have made provision for all taxes
payable by SOCO and its subsidiaries for which no SOCO Return has yet been
filed; (iv) SOCO and its subsidiaries have duly withheld and paid all taxes
required by applicable law to have been withheld and paid in connection with
amounts paid or owing to any employee, independent contractor, creditor, or
other third party; (v) there are no Liens for taxes upon any property or asset
of SOCO or any of its subsidiaries, except for Liens for taxes not yet due or
with respect to matters being contested by SOCO in good faith and for which
adequate reserves are reflected on the SOCO Balance Sheet; (vi) the charges,
accruals and reserves for taxes with respect to SOCO and its subsidiaries
reflected on the SOCO Balance Sheet are adequate under GAAP to cover the tax
liabilities accruing through the date thereof; (vii) there is no action, suit,
proceeding, audit or claim now proposed or pending against or with respect to
SOCO or any of its subsidiaries in respect of any tax where there is a
reasonable possibility of an adverse determination; and (viii) neither SOCO nor
any of its subsidiaries has been a member of an affiliated, consolidated,
combined or unitary group other than one of which SOCO was the common parent.
 
   (b) Neither SOCO nor any of its subsidiaries has given or been requested to
give any waiver of the statute of limitations relating to the payment of taxes
or have executed powers of attorney with respect to tax matters, in either case
that will be outstanding as of the Effective Time. There are no issues of law
or fact which, to the knowledge of SOCO, exist or which arise out of a formal
or informal notice of deficiency, proposed deficiency or assessment or request
for information from the Internal Revenue Service or any other governmental
taxing authority with respect to taxes of SOCO or any of its subsidiaries.
There are no outstanding rulings of, or requests for rulings with, any tax
authority addressed that are, or if issued would be, binding on SOCO and its
subsidiaries.
 
   (c) Prior to the date hereof, SOCO has provided or made available true and
correct copies of all material tax sharing, tax indemnity or similar agreements
to which SOCO or any of its subsidiaries is a party, is bound by or has any
obligation or liability for taxes. Neither SOCO nor any of its subsidiaries is
a party to any agreement providing for the allocation or sharing of taxes with
any entity that is not, directly or indirectly, a wholly-owned subsidiary of
SOCO. No consent under Section 341(f) of the Code has been filed with respect
to SOCO or any of its subsidiaries.
 
   (d) No "foreign person" held more than 5% of the SOCO Common Stock during
the applicable period specified in Section 897(c)(1)(A)(ii) of the Code.
 
   Section 3.15 Employee Benefit Plans. (a) SOCO has provided Santa Fe with a
list identifying each material "employee benefit plan," as defined in Section
3(3) of the Employee Retirement Income Security Act of 1974 ("ERISA"), each
employment, severance or similar contract, plan, arrangement or policy
applicable to any director, officer or employee of SOCO or any of its
subsidiaries and each material plan or arrangement (written or oral) providing
for compensation, bonuses, profit-sharing, stock option or other stock related
rights or other forms of incentive or deferred compensation, vacation benefits,
insurance coverage (including, without limitation, any self-insured
arrangements), health or medical benefits, disability benefits, workers'
compensation, supplemental unemployment benefits, severance benefits and post-
employment or retirement benefits (including, without limitation, compensation,
pension, health, medical or life insurance benefits) which
 
                                      A-11
<PAGE>
 
is maintained, administered or contributed to by SOCO or any of its affiliates
(as defined in Section 9.15) and covers any employee or former employee of SOCO
or any of its affiliates, or under which SOCO or any of its affiliates has any
liability (secondary, contingent or otherwise), including, without limitation,
any such plan, program or arrangement that has been terminated. Such plans are
referred to collectively herein as the "SOCO Employee Plans." Copies of all
such SOCO Employee Plans (and, if applicable, related trust agreements or
insurance contracts) and all amendments thereto and written interpretations
thereof have been furnished to Santa Fe together with the most recent annual
report (Form 5500 including, without limitation, if applicable, Schedule B
thereto) prepared in connection with any such SOCO Employee Plan.
 
   (b) Each SOCO Employee Plan has been funded and maintained in compliance
with its terms and with the requirements prescribed by any and all statutes,
orders, rules and regulations (including, without limitation, but not limited
to ERISA and the Code) which are applicable to such plan, except where failure
to so comply would not, individually or in the aggregate, have a SOCO Material
Adverse Effect.
 
   (c) No SOCO Employee Plan is subject to Title IV of ERISA.
 
   (d) Each SOCO Employee Plan which is intended to be qualified under Section
401(a) of the Code is so qualified and has been so qualified during the period
from its adoption to date, and each trust forming a part thereof is exempt from
tax pursuant to Section 501(a) of the Code.
 
   (e) No director or officer or, to the knowledge of SOCO, other employee of
SOCO or any of its subsidiaries will become entitled to any retirement,
severance or similar benefit or enhanced or accelerated benefit solely as a
result of the transactions contemplated hereby. Without limiting the generality
of the foregoing, no amount required to be paid or payable to or with respect
to any employee of SOCO or any of its subsidiaries in connection with the
transactions contemplated hereby (either solely as a result thereof or as a
result of such transactions in conjunction with any other event) will be an
"excess parachute payment" within the meaning of Section 280G of the Code.
 
   (f) Since the SOCO Balance Sheet Date, there has been no adoption of or
amendment to, written interpretation or announcement (whether or not written)
by SOCO or any of its affiliates relating to, or change in employee
participation or coverage under, any SOCO Employee Plan which would increase
materially the annual expense of maintaining such SOCO Employee Plan above the
level of the expense incurred in respect thereof for the 12 months ended on the
SOCO Balance Sheet Date.
 
   (g) Except for defined benefit plans (if applicable), the SOCO Employee
Plans may be terminated on a prospective basis without any continuing liability
for benefits other than benefits accrued to the date of such termination.
 
   (h) No SOCO Employee Plan is a "multiemployer plan" (as defined in Section
4001(a) (3) of ERISA) or a "multiple employer plan" (within the meaning of
Section 413(c) of the Code).
 
   (i) There are no actions, suits or claims pending (other than routine claims
for benefits) or, to the knowledge of SOCO, threatened against, or with respect
to, any of the SOCO Employee Plans or their assets.
 
   (j) To the knowledge of SOCO, there is no matter pending (other than routine
qualification determination filings) with respect to any of the SOCO Employee
Plans before the Internal Revenue Service, the Department of Labor or the
Pension Benefit Guaranty Corporation.
 
   Section 3.16 Environmental Matters. Except as set forth in the SOCO SEC
Filings made prior to the date hereof and except as would not, individually or
in the aggregate, have a SOCO Material Adverse Effect:
 
     (i) the businesses of SOCO and its subsidiaries have been and are
  operated in material compliance with all Environmental Laws and
  Environmental Permits;
 
                                      A-12
<PAGE>
 
     (ii) neither SOCO nor any of its subsidiaries has caused or allowed the
  generation, treatment, manufacture, processing, distribution, use, storage,
  discharge, release, disposal, transport or handling of any chemicals,
  pollutants, contaminants, wastes, toxic substances, hazardous substances,
  petroleum, petroleum products or any substance regulated under any
  Environmental Law ("Hazardous Substances") at any properties or facilities
  owned, leased or operated by SOCO or any of its subsidiaries, except in
  material compliance with all Environmental Laws;
 
     (iii) there are no pending, or to the knowledge of SOCO, threatened,
  claims, suits, actions, proceedings or investigations with respect to the
  businesses or operations of SOCO or any of its subsidiaries alleging or
  concerning any material violation of or responsibility or liability under
  any Environmental Law that, if adversely determined, could reasonably be
  expected to have a SOCO Material Adverse Effect, nor does SOCO have any
  knowledge of any fact or condition that could give rise to such a claim,
  suit, action, proceeding or investigation;
 
     (iv) SOCO and its subsidiaries are in possession of or have timely filed
  for all material Environmental Permits with respect to the operation of the
  businesses of SOCO and its subsidiaries; there are no pending or, to the
  knowledge of SOCO, threatened, actions, proceedings or investigations
  seeking to restrict, revoke or deny renewal of any of such Environmental
  Permits; and SOCO does not have knowledge of any fact or condition that is
  reasonably likely to give rise to any action, proceeding or investigation
  to restrict, revoke or deny renewal of any of such Environmental Permits;
 
     (v) no notice, notification, demand, request for information, citation,
  summons or order has been received, no complaint has been filed, no penalty
  has been assessed, and no investigation, action, claim, suit, proceeding or
  review is pending or, to the knowledge of SOCO, is threatened by any
  governmental entity or other person relating to or arising out of any
  Environmental Law; and
 
     (vi) there are no liabilities of or relating to SOCO or any of its
  subsidiaries of any kind whatsoever, whether accrued, contingent, absolute,
  determined, determinable or otherwise arising under or relating to any
  Environmental Law and SOCO does not have knowledge of any facts,
  conditions, situations or set of circumstances which could reasonably be
  expected to result in or be the basis for any such liability.
 
   (b) Neither SOCO nor any of its subsidiaries owns, leases or directly or
indirectly controls or has owned, leased or directly or indirectly controlled
any real property in New Jersey or Connecticut.
 
   (c) The following terms shall have the meaning set forth below:
 
   "SOCO" and "its subsidiaries" shall, solely for purposes of this Section
3.16, include any entity which is, in whole or in part, a corporate predecessor
of SOCO or any of its subsidiaries.
 
   "Environmental Laws" means any federal, state, local or foreign law
(including, without limitation, common law), treaty, judicial decision,
regulation, rule, judgment, order, decree, injunction, permit or governmental
restriction or requirement or any agreement with any governmental authority or
other third party, relating to human health and safety or the environment and
arising from the use, presence, disposal, discharge or release of Hazardous
Substances.
 
   "Environmental Permits" means, with respect to any person, all permits,
licenses, registrations, approvals and other similar authorizations of
governmental authorities relating to or required by Environmental Laws and
affecting, or relating in any way to, the business of such person as currently
conducted.
 
   Section 3.17 Tax Treatment. Neither SOCO nor any of its affiliates has taken
or agreed to take any action that would prevent the Merger from qualifying as a
368 Reorganization. Without limiting the generality of the foregoing:
 
     (a) Prior to and in connection with the Merger, (i) none of the SOCO
  Common Stock will be redeemed, (ii) no extraordinary distribution will be
  made with respect to SOCO Common Stock, and (iii)
 
                                      A-13
<PAGE>
 
  none of the SOCO Common Stock will be acquired by any person related (as
  defined in Treas. Reg. (S) 1.368-1(e)(3) without regard to (S) 1.368-
  1(e)(3)(i)(A)) to SOCO.
 
     (b) No assets of SOCO have been sold, transferred or otherwise disposed
  of which would prevent Santa Fe from continuing the historic business of
  SOCO or from using a significant portion of SOCO's historic business assets
  in a business following the Merger, and SOCO intends to continue its
  historic business or use a significant portion of its historic business
  assets in a business.
 
     (c) SOCO and the stockholders of SOCO will each pay their respective
  expenses, if any, incurred in connection with the Merger.
 
     (d) There is no intercorporate indebtedness existing between SOCO and
  Santa Fe that was issued, acquired, or will be settled at a discount.
 
     (e) SOCO is not an investment company as defined in section
  368(a)(2)(F)(iii) and (iv) of the Code.
 
     (f) SOCO is not under the jurisdiction of a court in a title 11 or
  similar case within the meaning of section 368(a)(3)(A) of the Code.
 
     (g) The liabilities of SOCO were incurred by SOCO in the ordinary course
  of its business.
 
   Section 3.18 Opinion of Financial Advisor. SOCO's Board of Directors has
received the opinion of Petrie Parkman & Co., financial advisor to SOCO, to
the effect that, as of the date of this Agreement, the Exchange Ratio is fair,
from a financial point of view, to the holders of SOCO Common Stock.
 
   Section 3.19 Patents and Other Proprietary Rights. SOCO and its
subsidiaries have rights to use, whether through ownership, licensing or
otherwise, all patents, trademarks, service marks, trade names, copyrights,
trade secrets, and other proprietary rights and processes of which SOCO is
aware that are material to its business as now conducted (collectively the
"SOCO Intellectual Property Rights"). Except for such matters as would not,
individually or in the aggregate, have a SOCO Material Adverse Effect, (a)
SOCO and its subsidiaries have not assigned, hypothecated or otherwise
encumbered any of the SOCO Intellectual Property Rights and (b) none of the
licenses included in the SOCO Intellectual Property Rights purports to grant
sole or exclusive licenses to another person including, without limitation,
sole or exclusive licenses limited to specific fields of use. To SOCO's
knowledge, the patents owned by SOCO and its subsidiaries are valid and
enforceable and any patent issuing from patent applications of SOCO and its
subsidiaries will be valid and enforceable, except as such invalidity or
unenforceability would not, individually or in the aggregate, have a SOCO
Material Adverse Effect. SOCO has no knowledge of any infringement by any
other person of any of the SOCO Intellectual Property Rights, and SOCO and its
subsidiaries have not, to SOCO's knowledge, entered into any agreement to
indemnify any other party against any charge of infringement of any of the
SOCO Intellectual Property Rights, except for such matters as would not,
individually or in the aggregate, have a SOCO Material Adverse Effect. To
SOCO's knowledge, SOCO and its subsidiaries have not and do not violate or
infringe any intellectual property right of any other person, and neither SOCO
nor any of its subsidiaries have received any communication alleging that it
violates or infringes the intellectual property right of any other person,
except for such matters as would not, individually or in the aggregate, have a
SOCO Material Adverse Effect. Except for such matters as would not,
individually or in the aggregate, have a SOCO Material Adverse Effect, SOCO
and its subsidiaries have not been sued for infringing any intellectual
property right of another person. None of the SOCO Intellectual Property
Rights or other know-how relating to the business of SOCO and its
subsidiaries, the value of which to SOCO is contingent upon maintenance of the
confidentiality thereof, has been disclosed by SOCO or any affiliate thereof
to any person other than those persons who are bound to hold such information
in confidence pursuant to confidentiality agreements or by operation of law.
 
   Section 3.20 Status and Operation of Oil and Gas Properties. (a) The Leases
of SOCO and its subsidiaries are in full force and effect in accordance with
their respective terms, all obligations of SOCO under such Leases have been
fully performed (to the extent required as of the date hereof) and there are
currently pending no requests or demands for payments, adjustments of payments
or performance pursuant to
 
                                     A-14
<PAGE>
 
obligations under the Leases, except where the failure of such Leases to be in
full force and effect in accordance with their terms, the failure to perform
thereunder or the pendency of such requests or demands, individually or in the
aggregate, would not have a SOCO Material Adverse Effect.
 
   (b) The Oil and Gas Contracts of SOCO or any of its subsidiaries are in full
force and effect in accordance with their respective terms, except for any such
Oil and Gas Contracts the termination of which, individually or in the
aggregate, would not have a SOCO Material Adverse Effect.
 
   (c) Neither SOCO nor any of its subsidiaries has (i) sold forward a material
amount of any Hydrocarbons, (ii) received any material advance, "take-or-pay"
or other similar payments under production sales contracts or otherwise that
entitle the purchasers to "make up" or otherwise receive deliveries of
Hydrocarbons without paying at such time the contract price therefor, (iii) any
commitment to deliver a minimum volume of Hydrocarbons to any person or to pay
a "make up" amount or transportation charge to such person for any shortfall,
or (iv) taken or received any material amount of Hydrocarbons under any gas
balancing agreements or any similar arrangements that permit any person
thereafter to receive any portion of the interest of SOCO or any of its
subsidiaries to "balance" any disproportionate allocation of Hydrocarbons.
 
   (d) For purposes of this Section 3.20 and Section 4.20:
 
   "Hydrocarbons" means oil, gas, minerals and other gaseous and liquid
hydrocarbons or any combination thereof.
 
   "Leases" means any oil, gas and mineral leasehold or fee interest, mineral
interests, royalty interests, net profits interests, licenses, concessions,
permits and other interests in Hydrocarbons in which (with respect to this
Section 3.20) SOCO or any of its subsidiaries, or (with respect to Section
4.20) Santa Fe or any of its subsidiaries, holds an interest.
 
   "Oil and Gas Contracts" means any lease, license, permit, assignment,
farmout, farmin, operating agreement, unit agreement, declaration or order,
joint venture or acquisition agreement, division order, production sales,
processing or transportation contract or other contract affecting the ownership
or operation of any of the properties constituting the Oil and Gas Interests or
the disposition of the Hydrocarbons produced therefrom.
 
   "Oil and Gas Interests" means (a) the interests of (with respect to this
Section 3.20) SOCO or any of its subsidiaries, or (with respect to Section
4.20) Santa Fe or any of its subsidiaries, as the case may be, in the Leases,
together with the interests (with respect to this Section 3.20) of SOCO or any
of its subsidiaries, or (with respect to Section 4.20) Santa Fe or any of its
subsidiaries, as the case may be, in and to all property and rights incident
thereto, including, without limitation, all rights in respect of any pooled or
unitized acreage by virtue of any Lease being a part thereof, all production
from the pool or unit allocated to any such Lease and all interests in any
wells within the pool or unit associated with the Leases; and (b) the interests
(with respect to this Section 3.20) of SOCO or any of its subsidiaries, or
(with respect to Section 4.20) Santa Fe or any of its subsidiaries, as the case
may be, in and to all of the personal property, fixtures and improvements
thereon, appurtenant thereto or used, held or obtained in connection with the
Leases or the production, treatment, sale, processing, transportation or
disposal of Hydrocarbons or water or other substances produced therefrom or
attributable thereto (whether located on or off the Leases, including, without
limitation, wells, equipment, casing, tanks, boilers, generators, crude oil,
condensate or other production in storage or in pipelines, flow lines, tubing,
pumps, motors, machinery and other equipment, gathering systems and field
separators) and all other tenements, hereditaments, improvements and
appurtenances thereunto belonging.
 
   Section 3.21 Reserve Reports. All information (including, without
limitation, the statement of the percentage of reserves from the oil and gas
wells and other interests evaluated therein to which SOCO or its subsidiaries
are entitled and the percentage of the costs and expenses related to such wells
or interests to be borne by SOCO or its subsidiaries) supplied to Netherland,
Sewell & Associates, Inc. by or on behalf of SOCO
 
                                      A-15
<PAGE>
 
and its subsidiaries that was material to such firm's estimates of proved oil
and gas reserves attributable to the Oil and Gas Interests of SOCO and its
subsidiaries in connection with the preparation of the proved oil and gas
reserve report concerning the Oil and Gas Interests of SOCO and its
subsidiaries as of December 31, 1997 and prepared by such engineering firm (the
"SOCO Reserve Report") was (at the time supplied or as modified or amended
prior to the issuance of the SOCO Reserve Report) true and correct in all
material respects.
 
   Section 3.22 Antitakeover Statutes and Rights Agreement. The Board of
Directors of SOCO has (i) approved this Agreement and the transactions
contemplated hereby and (ii) taken all action necessary to cause this Agreement
and the transactions contemplated hereby to be exempt from Section 203 of the
Delaware Law, and no other antitakeover or similar statute or regulation
applies or purports to apply to the transactions contemplated hereby. SOCO has
taken all action necessary to render the preferred share purchase rights issued
pursuant to the terms of the SOCO Plan inapplicable to the Merger, this
Agreement and the other transactions contemplated hereby.
 
   Section 3.23 Required Stockholder Vote or Consent. The only vote of the
holders of any class or series of SOCO's capital stock that will be necessary
to consummate the Merger and the other transactions contemplated by this
Agreement is the approval and adoption of this Agreement by the holders of a
majority of the votes entitled to be cast by holders of the SOCO Common Stock,
with each share of SOCO Common Stock being entitled to one vote per share (the
"SOCO Stockholders' Approval").
 
   Section 3.24 Hedging. As of the date of this Agreement and except as may be
implemented prior to the Effective Time in accordance with Section 5.01,
neither SOCO nor any of its subsidiaries is bound by futures, hedge, swap,
collar, put, call, floor, cap, option or other contracts that are intended to
benefit from, relate to or reduce or eliminate the risk of fluctuations in the
price of commodities, including, without limitation, Hydrocarbons, securities,
interest rates or any other matters.
 
   Section 3.25 Year 2000 Issues. The disclosures set forth in the SOCO SEC
Filings concerning potential computer hardware and software problems associated
with the year 2000 are true and correct in all material respects.
 
                                   ARTICLE IV
 
                   Representations and Warranties of Santa Fe
 
   Santa Fe represents and warrants to SOCO that, except as disclosed in the
Santa Fe Schedule of Exceptions (the "Santa Fe Schedule"), as of the date
hereof:
 
   Section 4.01 Corporate Existence and Power. Santa Fe is a corporation duly
incorporated, validly existing and in good standing under the laws of the State
of Delaware and has all corporate powers and all governmental licenses,
authorizations, permits, consents and approvals required to carry on its
business as now conducted, except for those licenses, authorizations, permits,
consents and approvals the absence of which would not, individually or in the
aggregate, have a Santa Fe Material Adverse Effect (as defined in Section
4.06). Santa Fe is duly qualified to do business as a foreign corporation and
is in good standing in each jurisdiction where such qualification is necessary
or appropriate, except for those jurisdictions where failure to be so qualified
would not, individually or in the aggregate, have a Santa Fe Material Adverse
Effect. Santa Fe has heretofore delivered to SOCO true and complete copies of
the certificate of incorporation and bylaws of Santa Fe as currently in effect,
and Santa Fe's certificate of incorporation and bylaws as so delivered are in
full force and effect. Santa Fe is not in default in any respect in the
performance, observation or fulfillment of any provision of its certificate of
incorporation or bylaws.
 
   Section 4.02 Corporate Authorization. (a) The execution, delivery and
performance by Santa Fe of this Agreement and the consummation of the
transactions contemplated hereby are within Santa Fe's corporate powers and,
except for the required approval of Santa Fe's stockholders in connection with
the consummation
 
                                      A-16
<PAGE>
 
of the Merger, have been duly authorized by all necessary corporate action. The
affirmative vote of the holders of a majority of the outstanding shares of
Santa Fe Common Stock is the only vote of the holders of any of Santa Fe's
capital stock necessary in connection with the consummation of the Merger. No
other vote of the holders of Santa Fe's capital stock is necessary in
connection with this Agreement or the consummation of the transactions
contemplated hereby. This Agreement has been duly and validly executed and
delivered by Santa Fe and constitutes a valid and binding agreement of Santa
Fe.
 
   (b) Santa Fe's Board of Directors, at a meeting duly called and held, has
(i) determined that this Agreement and the transactions contemplated hereby
(including, without limitation, the Merger) are fair to and in the best
interests of Santa Fe's stockholders, (ii) approved and adopted this Agreement
and the transactions contemplated hereby (including, without limitation, the
Merger), and (iii) recommended approval and adoption of this Agreement by its
stockholders.
 
   Section 4.03 Governmental Authorization. The execution, delivery and
performance by Santa Fe of this Agreement and the consummation by Santa Fe of
the transactions contemplated hereby require no action by or in respect of, or
filing with, any governmental body, agency, official or authority other than
(a) the filing of a certificate of merger in accordance with Delaware Law, (b)
compliance with any applicable requirements of the HSR Act, the 1933 Act, the
1934 Act, state laws relating to takeovers, if applicable, and foreign or state
securities or Blue Sky laws, and (c) any other filings, approvals or
authorizations which constitute Customary Post Closing Consents or which, if
not obtained, would not, individually or in the aggregate, have a Santa Fe
Material Adverse Effect or materially impair the ability of Santa Fe to
consummate the transactions contemplated by this Agreement.
 
   Section 4.04 Non-contravention. The execution, delivery and performance by
Santa Fe of this Agreement and the consummation by Santa Fe of the transactions
contemplated hereby do not and will not (i) subject to obtaining the Santa Fe
Stockholders' Approval (as defined in Section 4.23), violate the certificate of
incorporation or bylaws of Santa Fe, or the certificate of incorporation or
bylaws (or similar organizational documents) of any of Santa Fe's subsidiaries,
(ii) assuming compliance with the matters referred to in Section 4.03, violate
any applicable law, rule, regulation, judgment, writ, injunction, order or
decree, (iii) require any consent or other action by any person under, give
rise to any right of first refusal or similar right of any third party under,
constitute a default under, or give rise to any right of termination,
cancellation or acceleration of any right or obligation of Santa Fe or any of
its subsidiaries or to guaranteed payments or a loss of any benefit to which
Santa Fe or any of its subsidiaries is entitled under any provision of any
agreement or other instrument binding upon Santa Fe or any of its subsidiaries
or any license, franchise, permit, certificate, approval or other similar
authorization affecting, or relating in any way to, the assets or business of
Santa Fe or any of its subsidiaries, (iv) result in the creation or imposition
of any Lien on any shares of capital stock or any material properties or assets
of Santa Fe or any of its subsidiaries, or (v) result in any holder of any
securities of Santa Fe being entitled to appraisal, dissenters' or similar
rights, except, in the case of clauses (ii), (iii) and (iv), for such matters
as would not, individually or in the aggregate, have a Santa Fe Material
Adverse Effect or materially impair the ability of Santa Fe to consummate the
transactions contemplated by this Agreement.
 
   Section 4.05 Capitalization. The authorized capital stock of Santa Fe
consists of a total of 250,000,000 shares, of which 200,000,000 shares are
Santa Fe Common Stock and 50,000,000 shares are preferred stock, par value
$0.01 per share, of Santa Fe ("Santa Fe Preferred Stock"). No shares of Santa
Fe Preferred Stock are issued or outstanding, although a series of Santa Fe
Preferred Stock consisting of 2,000,000 shares has been designated as Series A
Junior Participating Preferred Stock and is subject to issuance under Santa
Fe's Preferred Stock Purchase Rights Plan, dated March 3, 1997 (the "Santa Fe
Plan"). As of January 11, 1999, there were outstanding 102,220,505 shares of
Santa Fe Common Stock and options to purchase an aggregate of 9,868,191 shares
of Santa Fe Common Stock at an average exercise price of $7.9853 per share (of
which 6,618,887 were exercisable). All outstanding shares of capital stock of
Santa Fe have been duly authorized and validly issued and are fully paid and
non-assessable. Except as set forth in this Section 4.05 or in the Santa Fe
Plan and except for changes since January 11, 1999 resulting from the exercise
of employee or non-employee
 
                                      A-17
<PAGE>
 
director stock options outstanding on such date, there are no outstanding (i)
shares of capital stock or voting securities of Santa Fe, (ii) securities of
Santa Fe convertible into or exchangeable for shares of capital stock or voting
securities of Santa Fe or (iii) options or other rights to acquire from Santa
Fe or other obligation of Santa Fe to issue, any capital stock, voting
securities or securities convertible into or exchangeable for capital stock or
voting securities of Santa Fe. There are no outstanding obligations of Santa Fe
or any of its subsidiaries to repurchase, redeem or otherwise acquire any
securities referred to in clauses (i), (ii) or (iii) above. Except for any
amendments filed with the Santa Fe SEC Filings (as defined below) made prior to
the date hereof, the Santa Fe Plan has not been amended except to provide that
the Santa Fe Plan is inapplicable to the execution and delivery of this
Agreement and the transactions contemplated hereby and any other agreements
executed and delivered in connection herewith. A Distribution Date has not
occurred within the meaning of the Santa Fe Plan, and the consummation of the
transactions contemplated hereby will not result in the occurrence of a
Distribution Date.
 
   Section 4.06 Subsidiaries. (a) Santa Fe has previously furnished SOCO with a
list of the name and jurisdiction of organization of each subsidiary (as
defined in Section 9.15) of Santa Fe, which list is true and correct. Each such
subsidiary is a corporation duly incorporated or an entity duly organized,
validly existing and in good standing under the laws of its jurisdiction of
incorporation or organization, as the case may be, has all corporate,
partnership or other entity derived powers and all governmental licenses,
authorizations, permits, consents and approvals required to carry on its
business as now conducted, except for those licenses, authorizations, permits,
consents and approvals the absence of which would not, individually or in the
aggregate, have a Santa Fe Material Adverse Effect. Each subsidiary of Santa Fe
is duly qualified to do business as a foreign corporation or entity, as the
case may be, and is in good standing in each jurisdiction where such
qualification is necessary, except for those jurisdictions where failure to be
so qualified would not, individually or in the aggregate, have a Santa Fe
Material Adverse Effect. Santa Fe has made available to SOCO a complete and
correct copy of the certificate of incorporation and bylaws (or similar
organizational documents) of each of Santa Fe's subsidiaries, each as amended
to date, and the certificate of incorporation and bylaws (or similar
organizational documents) as so delivered are in full force and effect. No
Santa Fe subsidiary is in default in any respect in the performance,
observation or fulfillment of any provision of its articles of incorporation or
bylaws (or similar organizational documents). Other than Santa Fe's
subsidiaries, Santa Fe does not beneficially own or control, directly or
indirectly, 5% or more of any class of equity or similar securities of any
corporation or other organization, whether incorporated or unincorporated. For
purposes of this Agreement (i) a "Santa Fe Material Adverse Effect" shall mean
any event, circumstance, condition, development or occurrence causing,
resulting in or having a material adverse effect on the financial condition,
business, assets, properties, prospects or results of operations of Santa Fe
and its subsidiaries, taken as a whole, provided that such term shall not
include effects on Santa Fe resulting from general economic conditions or from
market conditions (including, without limitation, changes in the market prices
for oil and gas) then prevailing generally in the oil and gas industry.
 
   (b) All of the outstanding capital stock of, or other voting securities or
ownership interests in, each subsidiary of Santa Fe is owned by Santa Fe,
directly or indirectly, free and clear of any Lien and free of any other
limitation or restriction (including, without limitation, any restriction on
the right to vote, sell or otherwise dispose of such capital stock or other
voting securities or ownership interests), other than any restrictions imposed
under the 1933 Act. Except as set forth in this Section 4.06, there are no
outstanding (i) shares of capital stock or other voting securities or ownership
interests in any of Santa Fe's subsidiaries, (ii) securities of Santa Fe or any
of its subsidiaries convertible into or exchangeable for shares of capital
stock or other voting securities or ownership interests in any of Santa Fe's
subsidiaries or (iii) options or other rights to acquire from Santa Fe or any
of its subsidiaries, or other obligation of Santa Fe or any of its subsidiaries
to issue, any capital stock or other voting securities or ownership interests
in, or any securities convertible into or exchangeable for any capital stock or
other voting securities or ownership interests in, any of Santa Fe's
subsidiaries. There are no outstanding obligations of Santa Fe or any of its
subsidiaries to repurchase, redeem or otherwise acquire any of the securities
referred to in clauses (i), (ii) or (iii) of this Section 4.06(b).
 
                                      A-18
<PAGE>
 
   Section 4.07 SEC Filings. (a) Santa Fe has filed with the SEC, and has
heretofore made available to SOCO true and complete copies of, each form,
registration statement, report, schedule, proxy or information statement and
other document (including, without limitation, exhibits and amendments
thereto), including, without limitation, its Annual Reports to Stockholders
incorporated by reference in certain of such reports, required to be filed by
it or its predecessors with the SEC since December 31, 1995 under the 1933 Act
or the 1934 Act (collectively, the "Santa Fe SEC Filings").
 
   (b) As of its respective filing date (or, if any Santa Fe SEC Filing was
amended, as of the date such amendment was filed), each Santa Fe SEC Filing,
including, without limitation, any financial statements or schedules included
therein, complied as to form in all material respects with the applicable
requirements of the 1933 Act and the 1934 Act.
 
   (c) As of its filing date (or, if any Santa Fe SEC Filing was amended, as of
the date such amendment was filed), each Santa Fe SEC Filing filed pursuant to
the 1934 Act did not contain any untrue statement of a material fact or omit to
state any material fact necessary in order to make the statements made therein,
in the light of the circumstances under which they were made, not misleading.
 
   (d) Each such registration statement, as amended or supplemented, if
applicable, filed by Santa Fe pursuant to the 1933 Act and constituting a Santa
Fe SEC Filing did not, as of the date such statement or amendment became
effective, contain any untrue statement of a material fact or omit to state any
material fact required to be stated therein or necessary to make the statements
therein not misleading.
 
   Section 4.08 Financial Statements. The audited consolidated financial
statements and unaudited consolidated interim financial statements of Santa Fe
included in the Santa Fe SEC Filings fairly present, in conformity with GAAP
applied on a consistent basis (except as may be indicated in the notes
thereto), the consolidated financial position of Santa Fe and its subsidiaries
as of the dates thereof and their consolidated results of operations and cash
flows for the periods then ended (subject to normal year-end adjustments and
the absence of financial footnotes in the case of any unaudited interim
financial statements). For purposes of this Agreement, "Santa Fe Balance Sheet"
means the consolidated balance sheet of Santa Fe as of September 30, 1998 set
forth in the Santa Fe quarterly report on Form 10-Q for the quarter ended
September 30, 1998 and "Santa Fe Balance Sheet Date" means September 30, 1998.
 
   Section 4.09 Absence of Certain Changes. Except as disclosed in the Santa Fe
SEC Filings made prior to the date hereof or as contemplated by this Agreement
or with respect to any of the actions referred to in any of clauses (b) through
(f) or (h) through (l) below to which SOCO has given its consent as
contemplated by Section 5.02, since the Santa Fe Balance Sheet Date, the
business of Santa Fe and its subsidiaries has been conducted in all material
respects in the ordinary course consistent with past practices and there has
not been:
 
     (a) any event, occurrence, development or state of circumstances or
  facts which has had, individually or in the aggregate, a Santa Fe Material
  Adverse Effect;
 
     (b) any declaration, setting aside or payment of any dividend or other
  distribution with respect to any shares of capital stock of Santa Fe or any
  of its subsidiaries (other than dividends paid by direct or indirect wholly
  owned subsidiaries), or any repurchase, redemption or other acquisition by
  Santa Fe or any of its subsidiaries of any outstanding shares of capital
  stock or other securities of, or other ownership interests in, Santa Fe or
  any of its subsidiaries;
 
     (c) except for amendments to the Santa Fe Plan contemplated by Section
  4.22, any amendment of any material term of any outstanding security of
  Santa Fe or any of its subsidiaries;
 
     (d) any incurrence, assumption or guarantee by Santa Fe or any of its
  subsidiaries of any material indebtedness for borrowed money other than
  trade debt incurred in the ordinary course and debt incurred pursuant to
  existing credit facilities and arrangements;
 
     (e) any creation or other incurrence by Santa Fe or any of its
  subsidiaries of any Lien on any material asset other than in the ordinary
  course consistent with past practices;
 
                                      A-19
<PAGE>
 
     (f) any making of any material loan, advance or capital contributions to
  or investment in any person other than loans, advances or capital
  contributions to or investments in wholly-owned subsidiaries of Santa Fe
  made in the ordinary course consistent with past practices;
 
     (g) any damage, destruction or other casualty loss affecting the
  business or assets of Santa Fe or any of its subsidiaries which, without
  considering the effect of any insurance, would, individually or in the
  aggregate, have a Santa Fe Material Adverse Effect;
 
     (h) except for sales of Hydrocarbons produced by Santa Fe and its
  subsidiaries in the ordinary course of business, any transaction or
  commitment made, or any contract or agreement entered into, by Santa Fe or
  any of its subsidiaries relating to its assets or business (including,
  without limitation, the acquisition or disposition of any assets) or any
  relinquishment by Santa Fe or any of its subsidiaries of any contract or
  other right, in either case, in excess of $10 million individually;
 
     (i) any change in any method of financial accounting or tax accounting
  or any accounting practice by Santa Fe or any of its subsidiaries, except
  for any such change required by reason of a change in GAAP or Regulation S-
  X promulgated under the 1934 Act;
 
     (j) any (i) grant of any severance or termination pay to (x) any
  employee of Santa Fe or any of its subsidiaries (other than officers (as
  defined in Section 9.15) or directors) other than ordinary course grants in
  amounts consistent with past practices or (y) any director or officer of
  Santa Fe or any of its subsidiaries, (ii) increase in benefits payable
  under any existing severance or termination pay policies or employment
  agreements, (iii) entering into of any employment, deferred compensation or
  other similar agreement (or any amendment to any such existing agreement)
  with any director, officer or employee of Santa Fe or any of its
  subsidiaries, (iv) establishment, adoption or amendment (except as required
  by applicable law) of any collective bargaining, bonus, profit sharing,
  thrift, pension, retirement, deferred compensation, compensation, stock
  option, restricted stock or other benefit plan or arrangement covering any
  director, officer, employee or former employee of Santa Fe or any of its
  subsidiaries, or (v) increase in compensation, bonus or other benefits
  payable to directors or officers other than ordinary course increases
  implemented prior to the date hereof consistent with past practices;
 
     (k) any material labor dispute, other than routine individual
  grievances, or, to the knowledge of Santa Fe, any activity or proceeding by
  a labor union or representative thereof to organize any material number of
  employees of Santa Fe or any of its subsidiaries, which employees were not
  subject to a collective bargaining agreement at the Santa Fe Balance Sheet
  Date, or any material lockouts, strikes, slowdowns, work stoppages or
  threats thereof by or with respect to such employees; or
 
     (l) any tax election, other than those consistent with past practice,
  not required by law or any settlement or compromise of any tax liability in
  either case that is material to Santa Fe and its subsidiaries, taken as a
  whole.
 
   Section 4.10 No Undisclosed Material Liabilities. There are no liabilities
of Santa Fe or any of its subsidiaries of any kind whatsoever, whether accrued,
contingent, absolute, determined, determinable or otherwise, and there is no
existing condition, situation or set of circumstances which could reasonably be
expected to result in such a liability, other than:
 
     (a) liabilities or obligations disclosed in the Santa Fe SEC Filings
  made prior to the date hereof or provided for in the Santa Fe Balance Sheet
  or disclosed in the notes thereto;
 
     (b) liabilities or obligations which would not, individually or in the
  aggregate, have a Santa Fe Material Adverse Effect; and
 
     (c) liabilities or obligations under this Agreement.
 
   Section 4.11 Compliance with Laws and Court Orders. Santa Fe and each of its
subsidiaries hold all Permits necessary for the lawful conduct of its
respective businesses, as now conducted, except for such Permits, the lack of
which, individually or in the aggregate, would not have a Santa Fe Material
Adverse
 
                                      A-20
<PAGE>
 
Effect. Except as set forth in the Santa Fe SEC Filings prior to the date
hereof, Santa Fe and each of its subsidiaries is and has been in compliance
with, and to the knowledge of Santa Fe, is not under investigation with respect
to and has not been threatened to be charged with or given notice of any
violation of, any applicable law, rule, regulation, judgment, injunction, order
or decree, except for such matters as would not, individually or in the
aggregate, have a Santa Fe Material Adverse Effect; provided, however,
notwithstanding the foregoing, no representation or warranty in this Section
4.11 is made with respect to Environmental Laws or Environmental Permits, which
are covered exclusively by the provisions set forth in Section 4.16.
 
   Section 4.12 Litigation. Except as set forth in the Santa Fe SEC Filings
prior to the date hereof, there is no action, suit, investigation, audit or
proceeding pending against, or to the knowledge of Santa Fe threatened against
or affecting, Santa Fe or any of its subsidiaries or any of their respective
properties or any of the directors or officers of Santa Fe or any of its
subsidiaries in their capacity as such before any court or arbitrator or any
governmental body, agency or official which would, individually or in the
aggregate, have a Santa Fe Material Adverse Effect. Neither Santa Fe nor any of
its subsidiaries, nor any director or employee of Santa Fe or any of its
subsidiaries, has been permanently or temporarily enjoined by any order,
judgment or decree of any court or any other governmental authority from
engaging in or continuing any conduct or practice in connection with the
business, assets or properties of Santa Fe or such subsidiary nor, to the
knowledge of Santa Fe, is Santa Fe, any subsidiary or any officer, director or
employee of Santa Fe or its subsidiaries under investigation by any
governmental authority. Except as disclosed in the Santa Fe SEC Filings made
prior to the date hereof, there is not in existence any order, judgment or
decree of any court or other tribunal or other agency enjoining or requiring
Santa Fe or any of its subsidiaries to take any action of any kind with respect
to its business, assets or properties, which would, individually or in the
aggregate, have a Santa Fe Material Adverse Effect. Notwithstanding the
foregoing, no representation or warranty in this Section 4.12 is made with
respect to Environmental Laws, which are covered exclusively by the provisions
set forth in Section 4.16.
 
   Section 4.13 Advisors' Fees. Except for Chase Securities Inc. and Donaldson,
Lufkin & Jenrette Securities Corporation, copies of whose engagement agreements
have been provided to SOCO, there is no investment banker, broker, finder or
other intermediary which has been retained by or is authorized to act on behalf
of Santa Fe or any of its subsidiaries who might be entitled to any fee or
commission in connection with the transactions contemplated by this Agreement.
 
   Section 4.14 Taxes. (a) Except as set forth in the Santa Fe Balance Sheet
(including, without limitation, the notes thereto) and except as would not,
individually or in the aggregate, have a Santa Fe Material Adverse Effect, (i)
all tax returns, statements, reports and forms (collectively, the "Santa Fe
Returns") required to be filed with any taxing authority by, or with respect
to, Santa Fe and its subsidiaries and any partnerships of which Santa Fe or its
subsidiaries is a partner have been duly and timely filed in accordance with
all applicable laws; (ii) Santa Fe and its subsidiaries have timely paid all
taxes due and payable, whether or not shown on any Santa Fe Return, and the
Santa Fe Returns correctly and completely reflect the income, business, assets,
operations, activities and the status of Santa Fe and its subsidiaries (other
than taxes which are being contested in good faith and for which adequate
reserves are reflected on the Santa Fe Balance Sheet); (iii) Santa Fe and its
subsidiaries have made provision for all taxes payable by Santa Fe and its
subsidiaries for which no Santa Fe Return has yet been filed; (iv) Santa Fe and
its subsidiaries have duly withheld and paid all taxes required by applicable
law to have been withheld and paid in connection with amounts paid or owing to
any employee, independent contractor, creditor, or other third party; (v) there
are no Liens for taxes upon any property or asset of Santa Fe or any of its
subsidiaries, except for Liens for taxes not yet due or with respect to matters
being contested by Santa Fe in good faith and for which adequate reserves are
reflected on the Santa Fe Balance Sheet; (vi) the charges, accruals and
reserves for taxes with respect to Santa Fe and its subsidiaries reflected on
the Santa Fe Balance Sheet are adequate under GAAP to cover the tax liabilities
accruing through the date thereof; (vii) there is no action, suit, proceeding,
audit or claim now proposed or pending against or with respect to Santa Fe or
any of its subsidiaries in respect of any tax where there is a reasonable
possibility of an adverse determination; and (viii) neither Santa Fe nor any of
its subsidiaries has been a member of an affiliated, consolidated, combined or
unitary group other than one of which Santa Fe was the common parent.
 
                                      A-21
<PAGE>
 
   Section 4.15 Employee Benefit Plans. (a) Santa Fe has provided SOCO with a
list identifying each material "employee benefit plan", as defined in Section
3(3) of ERISA, each employment, severance or similar contract, plan,
arrangement or policy applicable to any director, officer or employee of Santa
Fe or any of its subsidiaries and each material plan or arrangement (written or
oral) providing for compensation, bonuses, profit-sharing, stock option or
other stock related rights or other forms of incentive or deferred
compensation, vacation benefits, insurance coverage (including, without
limitation, any self-insured arrangements), health or medical benefits,
disability benefits, workers' compensation, supplemental unemployment benefits,
severance benefits and post-employment or retirement benefits (including,
without limitation, compensation, pension, health, medical or life insurance
benefits) which is maintained, administered or contributed to by Santa Fe or
any of its affiliates and covers any employee or former employee of Santa Fe or
any of its affiliates, or under which Santa Fe or any of its affiliates has any
liability (secondary, contingent or otherwise), including, without limitation,
any such plan, program or arrangement that has been terminated. Such plans are
referred to collectively herein as the "Santa Fe Employee Plans". Copies of all
such Santa Fe Employee Plans (and, if applicable, related trust agreements or
insurance contracts) and all amendments thereto and written interpretations
thereof have been furnished to SOCO together with the most recent annual report
(Form 5500 including, without limitation, if applicable, Schedule B thereto)
prepared in connection with any such Santa Fe Employee Plan.
 
   (b) Each Santa Fe Employee Plan has been funded and maintained in compliance
with its terms and with the requirements prescribed by any and all statutes,
orders, rules and regulations (including, without limitation, but not limited
to ERISA and the Code) which are applicable to such plan, except where failure
to so comply would not, individually or in the aggregate, have a Santa Fe
Material Adverse Effect.
 
   (c) No Santa Fe Employee Plan is subject to Title IV of ERISA.
 
   (d) Each Santa Fe Employee Plan which is intended to be qualified under
Section 401(a) of the Code is so qualified and has been so qualified during the
period from its adoption to date, and each trust forming a part thereof is
exempt from tax pursuant to Section 501(a) of the Code.
 
   (e) No director or officer or, to the knowledge of Santa Fe, other employee
of Santa Fe or any of its subsidiaries will become entitled to any retirement,
severance or similar benefit or enhanced or accelerated benefit solely as a
result of the transactions contemplated hereby. Without limiting the generality
of the foregoing, no amount required to be paid or payable to or with respect
to any employee of Santa Fe or any of its subsidiaries in connection with the
transactions contemplated hereby (either solely as a result thereof or as a
result of such transactions in conjunction with any other event) will be an
"excess parachute payment" within the meaning of Section 280G of the Code.
 
   (f) Since the Santa Fe Balance Sheet Date, there has been no adoption of or
amendment to, written interpretation or announcement (whether or not written)
by Santa Fe or any of its affiliates relating to, or change in employee
participation or coverage under, any Santa Fe Employee Plan which would
increase materially the annual expense of maintaining such Santa Fe Employee
Plan above the level of the expense incurred in respect thereof for the 12
months ended on the Santa Fe Balance Sheet Date.
 
   (g) Except for defined benefit plans (if applicable), the Santa Fe Employee
Plans may be terminated on a prospective basis without any continuing liability
for benefits other than benefits accrued to the date of such termination.
 
   (h) No Santa Fe Employee Plan is a "multiemployer plan" (as defined in
Section 4001(a)(3) of ERISA) or a "multiple employer plan" (within the meaning
of Section 413(c) of the Code).
 
   (i) There are no actions, suits or claims pending (other than routine claims
for benefits) or, to the knowledge of Santa Fe, threatened against, or with
respect to, any of the Santa Fe Employee Plans or their assets.
 
                                      A-22
<PAGE>
 
   (j) To the knowledge of Santa Fe, there is no matter pending (other than
routine qualification determination filings) with respect to any of the Santa
Fe Employee Plans before the Internal Revenue Service, the Department of Labor
or the Pension Benefit Guaranty Corporation.
 
   Section 4.16 Environmental Matters. (a) Except as set forth in the Santa Fe
SEC Filings made prior to the date hereof and except as would not, individually
or in the aggregate, have a Santa Fe Material Adverse Effect:
 
     (i) the businesses of Santa Fe and its subsidiaries have been and are
  operated in material compliance with all Environmental Laws and
  Environmental Permits;
 
     (ii) neither Santa Fe or any of its subsidiaries has caused or allowed
  the generation, treatment, manufacture, processing, distribution, use,
  storage, discharge, release, disposal, transport or handling of Hazardous
  Substances at any properties or facilities owned, leased or operated by
  Santa Fe or any of its subsidiaries, except in material compliance with all
  Environmental Laws;
 
     (iii) there are no pending, or to the knowledge of Santa Fe, threatened,
  claims, suits, actions, proceedings or investigations with respect to the
  businesses or operations of Santa Fe or any of its subsidiaries alleging or
  concerning any material violation of or responsibility or liability under
  any Environmental Law that, if adversely determined, could reasonably be
  expected to have a Santa Fe Material Adverse Effect, nor does Santa Fe have
  any knowledge of any fact or condition that could give rise to such a
  claim, suit, action, proceeding or investigation;
 
     (iv) Santa Fe and its subsidiaries are in the possession of or have
  timely filed for all material Environmental Permits with respect to the
  operation of the businesses of Santa Fe and its subsidiaries; there are no
  pending or, to the knowledge of Santa Fe, threatened, actions, proceedings
  or investigations seeking to restrict, revoke or deny renewal of any of
  such Environmental Permits; and Santa Fe does not have knowledge of any
  fact or condition that is reasonably likely to give rise to any action,
  proceeding or investigation to restrict, revoke or deny renewal of any of
  such Environmental Permits;
 
     (v) no notice, notification, demand, request for information, citation,
  summons or order has been received, no complaint has been filed, no penalty
  has been assessed, and no investigation, action, claim, suit, proceeding or
  review is pending or, to the knowledge of Santa Fe, is threatened by any
  governmental entity or other person relating to or arising out of any
  Environmental Law; and
 
     (vi) there are no liabilities of or relating to Santa Fe or any of its
  subsidiaries of any kind whatsoever, whether accrued, contingent, absolute,
  determined, determinable or otherwise arising under or relating to any
  Environmental Law and Santa Fe does not have knowledge of any facts,
  conditions, situations or set of circumstances which could reasonably be
  expected to result in or be the basis for any such liability.
 
   (b) Neither Santa Fe nor any of its subsidiaries owns, leases or directly or
indirectly controls or has owned, leased or directly or indirectly controlled
any real property in New Jersey or Connecticut.
 
   (c) "Santa Fe" and "its subsidiaries" shall, solely for purposes of this
Section 4.16, include any entity which is, in whole or in part, a corporate
predecessor of Santa Fe or any of its subsidiaries.
 
   Section 4.17 Tax Treatment. Neither Santa Fe nor any of its affiliates has
taken or agreed to take any action that would prevent the Merger from
qualifying as a 368 Reorganization. Without limiting the generality of the
foregoing:
 
     (a) In connection with the Merger, none of the SOCO Common Stock will be
  acquired by Santa Fe or a person related (as defined in Treas. Reg. (S)
  1.368-1(e)(3)) to Santa Fe for consideration other than Santa Fe Common
  Stock, respectively, except for any cash received in lieu of fractional
  share interests in Santa Fe Common Stock pursuant to Section 1.07 of this
  Agreement.
 
     (b) Following the Merger, Santa Fe will continue the historic business
  of SOCO or use a significant portion of its assets in a business, within
  the meaning of Treas. Reg. (S) 1.368-1(d).
 
                                      A-23
<PAGE>
 
     (c) There is no intercorporate indebtedness existing between SOCO and
  Santa Fe that was issued, acquired, or will be settled at a discount.
 
     (d) Santa Fe will pay its own expenses incurred in connection with or as
  part of the Merger or related transactions. Santa Fe has not paid and will
  not pay, directly or indirectly, any expenses (including, without
  limitation, transfer taxes) incurred by any holder of SOCO Common Stock in
  connection with or as part of the Merger or any related transactions. Santa
  Fe has not agreed to assume, nor will it directly or indirectly assume, any
  expense or other liability, whether fixed or contingent, of any holder of
  SOCO Common Stock.
 
     (e) Santa Fe is not an "investment company" as defined in Section
  368(a)(2)(F)(iii) and (iv) of the Code.
 
     (f) Santa Fe has no plan or intention to sell or otherwise dispose of
  any of the assets of SOCO except for dispositions made in the ordinary
  course of business or transfers or successive transfers to one or more
  corporations controlled (within the meaning of Section 368(c) of the Code)
  in each case by the transferor corporation, or to reacquire any of the
  Santa Fe Common Stock issued in the Merger.
 
   Section 4.18 Opinion of Financial Advisor. Santa Fe's Board of Directors has
received the opinion of either or both of Chase Securities Inc. and Donaldson,
Lufkin & Jenrette Securities Corporation, financial advisors to Santa Fe, to
the effect that, as of the date of this Agreement, the Exchange Ratio is fair
to Santa Fe's stockholders, from a financial point of view.
 
   Section 4.19 Patents and Other Proprietary Rights. Santa Fe and its
subsidiaries have rights to use, whether through ownership, licensing or
otherwise, all patents, trademarks, service marks, trade names, copyrights,
trade secrets, and other proprietary rights and processes of which Santa Fe is
aware that are material to its business as now conducted (collectively the
"Santa Fe Intellectual Property Rights"). Except for such matters as would not,
individually or in the aggregate, have a Santa Fe Material Adverse Effect, (a)
Santa Fe and its subsidiaries have not assigned, hypothecated or otherwise
encumbered any of the Santa Fe Intellectual Property Rights and (b) none of the
licenses included in the Santa Fe Intellectual Property Rights purports to
grant sole or exclusive licenses to another person including, without
limitation, sole or exclusive licenses limited to specific fields of use. To
Santa Fe's knowledge, the patents owned by Santa Fe and its subsidiaries are
valid and enforceable and any patent issuing from patent applications of Santa
Fe and its subsidiaries will be valid and enforceable, except as such
invalidity or unenforceability would not, individually or in the aggregate,
have a Santa Fe Material Adverse Effect. Santa Fe has no knowledge of any
infringement by any other person of any of the Santa Fe Intellectual Property
Rights, and Santa Fe and its subsidiaries have not, to Santa Fe's knowledge,
entered into any agreement to indemnify any other party against any charge of
infringement of any of the Santa Fe Intellectual Property Rights, except for
such matters as would not, individually or in the aggregate, have a Santa Fe
Material Adverse Effect. To Santa Fe's knowledge, Santa Fe and its subsidiaries
have not and do not violate or infringe any intellectual property right of any
other person, and neither Santa Fe nor any of its subsidiaries have received
any communication alleging that it violates or infringes the intellectual
property right of any other person, except for such matters as would not,
individually or in the aggregate, have a Santa Fe Material Adverse Effect.
Except for such matters as would not, individually or in the aggregate, have a
Santa Fe Material Adverse Effect, Santa Fe and its subsidiaries have not been
sued for infringing any intellectual property right of another person. None of
the Santa Fe Intellectual Property Rights or other know-how relating to the
business of Santa Fe and its subsidiaries, the value of which to Santa Fe is
contingent upon maintenance of the confidentiality thereof, has been disclosed
by Santa Fe or any affiliate thereof to any person other than those persons who
are bound to hold such information in confidence pursuant to confidentiality
agreements or by operation of law.
 
   Section 4.20 Status and Operation of Oil and Gas Properties. (a) The Leases
of Santa Fe and its subsidiaries are in full force and effect in accordance
with their respective terms, all obligations of Santa Fe under such Leases have
been fully performed (to the extent required as of the date hereof) and there
are currently pending no requests or demands for payments, adjustments of
payments or performance pursuant to
 
                                      A-24
<PAGE>
 
obligations under the Leases, except where the failure of such Leases to be in
full force and effect in accordance with their terms, the failure to perform
thereunder or the pendency of such requests or demands, individually or in the
aggregate, would not have a Santa Fe Material Adverse Effect.
 
   (b) Oil and Gas Contracts of Santa Fe or any of its subsidiaries are in full
force and effect in accordance with their respective terms, except for any such
Oil and Gas Contracts the termination of which, individually or in the
aggregate, would not have a Santa Fe Material Adverse Effect.
 
   (c) Neither Santa Fe nor any of its subsidiaries has (i) sold forward a
material amount of any Hydrocarbons, (ii) received any material advance, "take-
or-pay" or other similar payments under production sales contracts or otherwise
that entitle the purchasers to "make up" or otherwise receive deliveries of
Hydrocarbons without paying at such time the contract price therefor, (iii) any
commitment to deliver a minimum volume of Hydrocarbons to any person or to pay
a "make up" amount or transportation charge to such person for any shortfall,
or (iv) taken or received any material amount of Hydrocarbons under any gas
balancing agreements or any similar arrangements that permit any person
thereafter to receive any portion of the interest of Santa Fe or any of its
subsidiaries to "balance" any disproportionate allocation of Hydrocarbons.
 
   Section 4.21 Reserve Reports. All information (including, without
limitation, the statement of the percentage of reserves from the oil and gas
wells and other interests evaluated therein to which Santa Fe or its
subsidiaries are entitled and the percentage of the costs and expenses related
to such wells or interests to be borne by Santa Fe or its subsidiaries)
supplied to Ryder Scott Company by or on behalf of Santa Fe and its
subsidiaries that was material to such firm's estimates of proved oil and gas
reserves attributable to the Oil and Gas Interests of Santa Fe and its
subsidiaries in connection with the preparation of the proved oil and gas
reserve report concerning the Oil and Gas Interests of Santa Fe and its
subsidiaries as of December 31, 1997 and prepared by such engineering firm (the
"Santa Fe Reserve Report") was (at the time supplied or as modified or amended
prior to the issuance of the Santa Fe Reserve Report) true and correct in all
material respects.
 
   Section 4.22 Antitakeover Statutes and Rights Agreement. The Board of
Directors of Santa Fe has (i) approved this Agreement and the transactions
contemplated hereby and (ii) taken all action necessary to cause this Agreement
and the transactions contemplated hereby to be exempt from Section 203 of the
Delaware Law, and no other antitakeover or similar statute or regulation
applies or purports to apply to the transactions contemplated hereby. Santa Fe
has taken all action necessary to render the preferred stock purchase rights
issued pursuant to the terms of the Santa Fe Plan inapplicable to the Merger,
this Agreement and the other transactions contemplated hereby.
 
   Section 4.23 Required Stockholder Vote or Consent. The only vote of the
holders of any class or series of Santa Fe's capital stock that will be
necessary to consummate the Merger and the other transactions contemplated by
this Agreement is the approval and adoption of this Agreement by the holders of
a majority of the votes entitled to be cast by holders of the Santa Fe Common
Stock, with each share of Santa Fe Common Stock being entitled to one vote per
share (the "Santa Fe Stockholders' Approval").
 
   Section 4.24 Hedging. As of the date of this Agreement and except as may be
implemented prior to the Effective Time in accordance with Section 5.02,
neither Santa Fe nor any of its subsidiaries is bound by futures, hedge, swap,
collar, put, call, floor, cap, option or other contracts that are intended to
benefit from, relate to or reduce or eliminate the risk of fluctuations in the
price of commodities, including, without limitation, Hydrocarbons, securities,
interest rates or any other matters.
 
   Section 4.25 Year 2000 Issues. The disclosures set forth in the Santa Fe SEC
Filings concerning potential computer hardware and software problems associated
with the year 2000 are true and correct in all material respects.
 
                                      A-25
<PAGE>
 
                                   ARTICLE V
 
                       Conduct of Business Pending Merger
 
   Section 5.01 Conduct of SOCO. SOCO agrees that from the date hereof until
the Effective Time, except (i) with the prior written consent of Santa Fe, (ii)
as contemplated by this Agreement and (iii) as disclosed in the SOCO Schedule,
SOCO and its subsidiaries shall conduct their business only in the ordinary
course consistent with past practice and oil field practices standard in the
industry and shall use all reasonable commercial efforts to preserve intact
their business organizations and relationships with third parties and to keep
available the services of their present officers and employees. Without
limiting the generality of the foregoing, and except (i) with the prior written
consent of Santa Fe, (ii) as contemplated by this Agreement and (iii) as
disclosed in the SOCO Schedule, from the date hereof until the Effective Time:
 
     (a) neither SOCO nor any of its subsidiaries will adopt or propose any
  change in its certificate of incorporation or bylaws (or similar
  organizational documents);
 
     (b) SOCO will not, and will not permit any of its subsidiaries to, merge
  or consolidate with any other person or acquire assets of any other person
  in excess of $10 million individually or $30 million in the aggregate;
 
     (c) SOCO will not, and will not permit any of its subsidiaries to (i)
  declare, set aside or pay any dividend or other distribution with respect
  to any shares of capital stock of SOCO or its subsidiaries (except for
  intercompany dividends from direct or indirect wholly owned subsidiaries)
  or (ii) repurchase, redeem or otherwise acquire any outstanding shares of
  capital stock or other securities of, or other ownership interests in, SOCO
  or any of its subsidiaries, other than intercompany acquisitions of stock
  among SOCO and its wholly owned subsidiaries;
 
     (d) SOCO will not settle any material tax audit, make or change any
  material tax election or file any material amended tax return;
 
     (e) except as otherwise permitted by this Agreement, SOCO will not issue
  any securities (whether through the issuance or granting of options,
  warrants, rights or otherwise and except pursuant to existing obligations
  disclosed in the SOCO SEC Filings made prior to the date hereof), enter
  into any amendment of any term of any outstanding security of SOCO or of
  any of its subsidiaries, incur any indebtedness except trade debt in the
  ordinary course of business and debt pursuant to existing credit facilities
  or arrangements, fail to make any required contribution to any SOCO
  Employee Plan, increase compensation, bonus or other benefits payable to,
  or modify or amend any employment agreements or severance agreements with,
  any director, officer or former employee or enter into any settlement or
  consent with respect to any pending litigation other than settlements in
  the ordinary course of business;
 
     (f) SOCO will not change any method of accounting or accounting practice
  by SOCO or any of its subsidiaries, except for any such change required by
  GAAP;
 
     (g) SOCO will not take any action that would give rise to a claim under
  the WARN Act (as defined in Section 9.15) or any similar state law or
  regulations because of a "plant closing" or "mass layoff" (each as defined
  in the WARN Act);
 
     (h) SOCO will not amend or otherwise change the terms of the engagement
  letter with Petrie Parkman & Co.;
 
     (i) Neither SOCO nor any of its subsidiaries will become bound or
  obligated to participate in any operation, or consent to participate in any
  operation, with respect to any Oil and Gas Interests that will cost in
  excess of $10 million individually or $50 million in the aggregate, unless
  the operation is a currently existing obligation of SOCO or any of its
  subsidiaries;
 
     (j) Neither SOCO nor any of its subsidiaries will (i) enter into any
  futures, hedge, swap, collar, put, call, floor, cap, option or other
  contracts that are intended to benefit from or reduce or eliminate the risk
  of
 
                                      A-26
<PAGE>
 
  fluctuations in the price of commodities, including, without limitation,
  Hydrocarbons, securities, interest rates or other matters, other than
  hedges with a duration of less than eight months relating to SOCO's
  production of Hydrocarbons not in excess of 75% of SOCO's total daily
  production of Hydrocarbons in accordance with SOCO's hedging policy as in
  effect on the date hereof or (ii) enter into any commodity sales agreements
  with a duration of more than three months;
 
     (k) SOCO will not, and will not permit any of its subsidiaries to, sell,
  lease, license, encumber or otherwise dispose of or create a Lien on any
  material assets or property except (i) pursuant to existing contracts or
  commitments or (ii) in the ordinary course consistent with past practice;
 
     (l) SOCO will not, and will not permit any of its subsidiaries to, take,
  and will not omit or agree to omit to take, any action that would make any
  representation and warranty of SOCO hereunder materially inaccurate in any
  respect at, or as of any time prior to, the Effective Time; and
 
     (m) SOCO will not, and will not permit any of its subsidiaries to, agree
  or commit to do any of the foregoing.
 
   Section 5.02 Conduct of Santa Fe. Santa Fe agrees that from the date hereof
until the Effective Time, except (i) with the prior written consent of SOCO,
(ii) as contemplated in this Agreement and (iii) as described in the Santa Fe
Schedule, Santa Fe and its subsidiaries shall conduct their business only in
the ordinary course consistent with past practice and oil field practices
standard in the industry and shall use all reasonable commercial efforts to
preserve intact their business organizations and relationships with third
parties and to keep available the services of their present officers and
employees. Without limiting the generality of the foregoing, and except (i)
with the prior written consent of SOCO, (ii) as contemplated in this Agreement
and (iii) as described in the Santa Fe Schedule, from the date hereof until the
Effective Time:
 
     (a) neither Santa Fe nor any of its subsidiaries will adopt or propose
  any change in its certificate of incorporation or bylaws (or similar
  organizational documents);
 
     (b) Santa Fe will not, and will not permit any of its subsidiaries to,
  merge or consolidate with any other person or acquire assets of any other
  person in excess of $10 million individually or $30 million in the
  aggregate;
 
     (c) Santa Fe will not, and will not permit any of its subsidiaries to
  (i) declare, set aside or pay any dividend or other distribution with
  respect to any shares of capital stock of Santa Fe or its subsidiaries
  (except for intercompany dividends from direct or indirect wholly owned
  subsidiaries) or (ii) repurchase, redeem or otherwise acquire any
  outstanding shares of capital stock or other securities of, or other
  ownership interests in, Santa Fe or any of its subsidiaries, other than
  intercompany acquisitions of stock among Santa Fe and its wholly owned
  subsidiaries;
 
     (d) Santa Fe will not settle any material tax audit, make or change any
  material tax election or file any material amended tax return;
 
     (e) Except as otherwise permitted by this Agreement, Santa Fe will not
  issue any securities (whether through the issuance or granting of options,
  warrants, rights or otherwise and except pursuant to existing obligations
  disclosed in the Santa Fe SEC Filings made prior to the date hereof), enter
  into any amendment of any term of any outstanding security of Santa Fe or
  of any of its subsidiaries, incur any indebtedness except trade debt in the
  ordinary course of business and debt pursuant to existing credit facilities
  or arrangements, fail to make any required contribution to any Santa Fe
  Employee Plan, increase compensation, bonus or other benefits payable to,
  or modify or amend any employment agreements or severance agreements with,
  any director, officer or former employee or enter into any settlement or
  consent with respect to any pending litigation other than settlements in
  the ordinary course of business;
 
                                      A-27
<PAGE>
 
     (f) Santa Fe will not change any method of accounting or accounting
  practice by Santa Fe or any of its subsidiaries, except for any such change
  required by GAAP;
 
     (g) Santa Fe will not take any action that would give rise to a claim
  under the WARN Act or any similar state law or regulations because of a
  "plant closing" or "mass layoff" (each as defined in the WARN Act);
 
     (h) Santa Fe will not amend or otherwise change the terms of the
  engagement letters with Chase Securities Inc. and Donaldson, Lufkin &
  Jenrette Securities Corporation;
 
     (i) Neither Santa Fe nor any of its subsidiaries will become bound or
  obligated to participate in any operation, or consent to participate in any
  operation, with respect to any Oil and Gas Interests that will cost in
  excess of $10 million individually or $50 million in the aggregate, unless
  the operation is a currently existing obligation of Santa Fe or any of its
  subsidiaries;
 
     (j) Neither Santa Fe nor any of its subsidiaries will (i) enter into any
  futures, hedge, swap, collar, put, call, floor, cap, option or other
  contracts that are intended to benefit from or reduce or eliminate the risk
  of fluctuations in the price of commodities, including, without limitation,
  Hydrocarbons, securities, interest rates or other matters, other than
  hedges with a duration of less than eight months relating to Santa Fe's
  production of Hydrocarbons not in excess of 75% of Santa Fe's total daily
  production of Hydrocarbons in accordance with Santa Fe's hedging policy as
  in effect on the date hereof or (ii) enter into any commodity sales
  agreements with a duration of more than three months;
 
     (k) Santa Fe will not, and will not permit any of its subsidiaries to,
  sell, lease, license, encumber or otherwise dispose of or create a Lien on
  any material assets or property except (i) pursuant to existing contracts
  or commitments or (ii) in the ordinary course consistent with past
  practice;
 
     (l) Santa Fe will not, and will not permit any of its subsidiaries to,
  take, and will not omit or agree to omit to take, any action that would
  make any representation and warranty of Santa Fe hereunder materially
  inaccurate in any respect at, or as of any time prior to, the Effective
  Time; and
 
     (m) Santa Fe will not, and will not permit any of its subsidiaries to,
  agree or commit to do any of the foregoing.
 
                                   ARTICLE VI
 
                             Additional Agreements
 
   Section 6.01 Access and Information. The parties shall each afford to the
other and to the other's financial advisors, legal counsel, accountants,
consultants, financing sources, and other authorized representatives access
during normal business hours throughout the period prior to the Effective Time
to all of its books, records, properties, contracts, leases, plants and
personnel and, during such period, each shall furnish promptly to the other (a)
a copy of each report, schedule and other document filed or received by it
pursuant to the requirements of federal or state securities laws, and (b) all
other information as such other party reasonably may request, provided that no
investigation pursuant to this Section 6.01 shall affect any representations or
warranties made herein or the conditions to the obligations of the respective
parties to consummate the Merger. Notwithstanding the foregoing, the
Confidentiality Agreement dated December 16, 1998, between Santa Fe and SOCO
(the "Confidentiality Agreement") shall survive the execution and delivery of
this Agreement.
 
   Section 6.02 Acquisition Proposals.
 
   (a) From the date of this Agreement until the earlier to occur of the
termination hereof and the Effective Time, Santa Fe and its subsidiaries will
not, and will cause their respective officers, directors, employees or other
advisors and agents not to, directly or indirectly, (i) take any action to
solicit, initiate or encourage any Santa Fe Acquisition Proposal (as
hereinafter defined) or (ii) engage in negotiations with, or disclose any non-
public information relating to Santa Fe or its subsidiaries, respectively, or
afford access to their respective
 
                                      A-28
<PAGE>
 
properties, books or records to any person that may be considering making, or
has made, a Santa Fe Acquisition Proposal. Nothing contained in this Section
6.02(a) shall prohibit Santa Fe and its Board of Directors from (i) taking and
disclosing a position with respect to a tender offer by a third party pursuant
to Rules 14d-9 and 14e-2(a) promulgated by the SEC under the 1934 Act, or (ii)
furnishing information, including, without limitation, non-public information
to, or entering into negotiations with, any person or entity that has made a
Santa Fe Acquisition Proposal (as defined herein), provided that the Board of
Directors of Santa Fe has determined in good faith that such Santa Fe
Acquisition Proposal could reasonably be expected to be a Superior Santa Fe
Acquisition Proposal (as defined herein), or (iii) withdrawing, modifying or
changing its recommendation of this Agreement or the Merger in a manner adverse
to SOCO or recommending to the stockholders of Santa Fe any Santa Fe
Acquisition Proposal, provided that the Board of Directors of Santa Fe has
determined in good faith that such Santa Fe Acquisition Proposal is a Superior
Santa Fe Acquisition Proposal, and with respect to clauses (ii) and (iii) of
this sentence, if, and only if (A) the Board of Directors of Santa Fe, after
duly considering the advice of outside legal counsel to Santa Fe, determines in
good faith that such action is required for the Board of Directors of Santa Fe
to comply with its fiduciary duties to stockholders imposed by applicable law,
(B) contemporaneously with taking such action Santa Fe provides written notice
to SOCO, which notice shall include the identity of the person making such
Santa Fe Acquisition Proposal, the material terms and conditions of such Santa
Fe Acquisition Proposal (including, without limitation, a copy thereof, if such
Santa Fe Acquisition Proposal is in written form or is electronically or
magnetically stored) and a description of any information requested or
furnished and any discussions or negotiations requested or conducted and (C)
Santa Fe uses all reasonable commercial efforts to keep SOCO informed in all
material respects of the status and terms of any such negotiations or
discussions (including, without limitation, the identity of the person or
entity with whom such negotiations or discussions are being held) and provides
SOCO copies of such written proposals and any amendments or revisions thereto
or correspondence related thereto, provided that SOCO agrees to execute a
confidentiality agreement, in form reasonably acceptable to it, with respect to
any such information delivered to SOCO pursuant to clauses (B) and (C) of this
Section 6.02(a), which confidentiality agreement shall be subject to SOCO's
disclosure obligations arising under applicable law or securities exchange
regulations. The term "Santa Fe Acquisition Proposal" as used herein means any
offer or proposal for, or any indication of interest in, a merger or other
business combination directly or indirectly involving Santa Fe or any material
subsidiary of Santa Fe, or the acquisition of a substantial equity interest in,
or a substantial portion of the assets of, any such party, other than the
transactions contemplated by this Agreement. For purposes of this Agreement,
"Superior Santa Fe Acquisition Proposal" means a bona fide written Santa Fe
Acquisition Proposal which the Board of Directors of Santa Fe concludes in good
faith (after consultation with its financial advisors and legal counsel),
taking into account all legal, financial, regulatory and other aspects of the
proposal and the person making the proposal, (i) would, if consummated, result
in a transaction that is more favorable to Santa Fe's stockholders from a
strategic and financial point of view, than the transactions contemplated by
this Agreement and (ii) is reasonably capable of being completed.
 
   (b) From the date of this Agreement until the earlier to occur of the
termination hereof and the Effective Time, SOCO and its subsidiaries will not,
and will cause their respective officers, directors, employees or other
advisors or agents not to, directly or indirectly, (i) take any action to
solicit, initiate or encourage any SOCO Acquisition Proposal (as hereinafter
defined) or (ii) engage in negotiations with, or disclose any non-public
information relating to SOCO or its subsidiaries, respectively, or afford
access to their respective properties, books or records to any person that may
be considering making, or has made, a SOCO Acquisition Proposal. Nothing
contained in this Section 6.02(b) shall prohibit SOCO and its Board of
Directors from (i) taking and disclosing a position with respect to a tender
offer by a third party pursuant to Rules 14d-9 and 14e-2(a) promulgated by the
SEC under the 1934 Act, or (ii) furnishing information, including, without
limitation, non-public information to, or entering into negotiations with, any
person or entity that has made a SOCO Acquisition Proposal (as defined herein),
provided that the Board of Directors of SOCO has determined in good faith that
such SOCO Acquisition Proposal could reasonably be expected to be a Superior
SOCO Acquisition Proposal (as defined herein), or (iii) withdrawing, modifying
or changing its recommendation of this Agreement or the Merger in a manner
adverse to Santa Fe or recommending to the stockholders of SOCO any SOCO
 
                                      A-29
<PAGE>
 
Acquisition Proposal, provided that the Board of Directors of SOCO has
determined in good faith that such SOCO Acquisition Proposal is a Superior SOCO
Acquisition Proposal, and, with respect to clauses (ii) and (iii) of this
sentence, if, and only if, (A) the Board of Directors of SOCO, after duly
considering the advice of outside legal counsel to SOCO, determines in good
faith that such action is required for the Board of Directors of SOCO to comply
with its fiduciary duties to stockholders imposed by applicable law, (B)
contemporaneously with taking such action SOCO provides written notice to Santa
Fe, which notice shall include the identity of the person making such SOCO
Acquisition Proposal, the material terms and conditions of such SOCO
Acquisition Proposal (including, without limitation, a copy thereof, if such
SOCO Acquisition Proposal is in written form or is electronically or
magnetically stored) and a description of any information requested or
furnished and any discussions or negotiations requested or conducted and (C)
SOCO uses all reasonable commercial efforts to keep Santa Fe informed in all
material respects of the status and terms of any such negotiations or
discussions (including, without limitation, the identity of the person or
entity with whom such negotiations or discussions are being held) and provides
Santa Fe copies of such written proposals and any amendments or revisions
thereto or correspondence related thereto, provided that Santa Fe agrees to
execute a confidentiality agreement, in form reasonably acceptable to it, with
respect to any such information delivered to Santa Fe pursuant to clauses (B)
and (C) of this Section 6.02(b), which confidentiality agreement shall be
subject to Santa Fe's disclosure obligations arising under applicable law or
securities exchange regulations. The term "SOCO Acquisition Proposal" as used
herein means any offer or proposal for, or any indication of interest in, a
merger or other business combination directly or indirectly involving SOCO or
any material subsidiary of SOCO or the acquisition of a substantial equity
interest in, or a substantial portion of the assets of, any such party, other
than the transactions contemplated by this Agreement. For purposes of this
Agreement, "Superior SOCO Acquisition Proposal" means a bona fide written SOCO
Acquisition Proposal which the Board of Directors of SOCO concludes in good
faith (after consultation with its financial advisors and legal counsel),
taking into account all legal, financial, regulatory and other aspects of the
proposal and the person making the proposal, (i) would, if consummated, result
in a transaction that is more favorable to SOCO's stockholders from a strategic
and financial point of view, than the transactions contemplated by this
Agreement and (ii) is reasonably capable of being completed.
 
   Section 6.03 Directors' and Officers' Indemnification and Insurance.
 
   (a) From the Effective Time and continuing for six years thereafter, Santa
Fe shall indemnify, defend and hold harmless each person who is now or has been
at any time prior to the date hereof, or who becomes prior to the Effective
Time, an officer or director of SOCO or any of its subsidiaries or an employee
of SOCO or any of its subsidiaries who acts as a fiduciary under any of the
SOCO Employee Plans (each an "Indemnified Party") against all losses, claims,
damages, liabilities, fees and expenses (including, without limitation,
reasonable fees and disbursements of counsel and judgments, fines, losses,
claims, liabilities and amounts paid in settlement (provided that any such
settlement is effected with the prior written consent of Santa Fe, which will
not be unreasonably withheld)) arising in whole or in part out of actions or
omissions in their capacity as such occurring at or prior to the Effective Time
to the full extent as set forth under the DGCL, the certificate of
incorporation or the bylaws of SOCO, in each case as in effect at the Effective
Time, including, without limitation, provisions therein relating to the
advancement of expenses incurred in the defense of any action or suit;
provided, that if any claim or claims are asserted or made within such six-year
period, all rights to indemnification in respect of any such claim or claims
shall continue until disposition of any and all such claims. After the six-year
period referred to in the immediately preceding sentence (as such six-year
period is affected by the proviso of such sentence), the Indemnified Parties
shall have no rights to indemnification under this Agreement, and any rights of
any Indemnified Party to indemnification for actions or omissions occurring at
or prior to the Effective Time shall thereafter be limited to such
indemnification, if any, as is mandated under the DGCL.
 
   (b) Santa Fe shall maintain SOCO's officers' and directors' liability
insurance policy or purchase a "tail" thereunder ("D&O Insurance") for a period
of not less than six years after the Effective Time, but only to the extent
related to actions or omissions prior to the Effective Time; provided, that the
aggregate amount of
 
                                      A-30
<PAGE>
 
premiums to be paid with respect to the maintenance of such D&O Insurance for
such six-year period shall not exceed $500,000.
 
   Section 6.04 Fees and Expenses. (a) Except as provided in paragraphs (c) and
(d), all Expenses (as defined below) incurred by the parties hereto shall be
borne solely and entirely by the party that has incurred such Expenses;
provided, however, that if this Agreement is terminated for any reason, then
the allocable share of Santa Fe and SOCO for all Expenses (excluding the fees
and expenses of legal counsel, accountants, tax advisors and investment
bankers) related to preparing, printing, filing and mailing the Registration
Statement, the Proxy Statement/Prospectus and all SEC and other regulatory
filing fees incurred in connection with the Registration Statement, Proxy
Statement/Prospectus and the HSR Act, shall be allocated one-half each.
 
   (b) "Expenses" as used in this Agreement shall include all reasonable out-
of-pocket expenses (including, without limitation, all reasonable fees and
expenses of counsel, accountants, investment bankers, experts and consultants
to a party hereto and its affiliates) incurred by a party or on its behalf in
connection with or related to the authorization, preparation, negotiation,
execution and performance of this Agreement, the preparation, printing, filing
and mailing of the Registration Statement, the Proxy Statement/Prospectus, the
solicitation of stockholder approvals, requisite HSR Act filings and all other
matters related to the consummation of the transactions contemplated hereby.
 
   (c) SOCO shall pay Santa Fe a fee in immediately available funds (a "SOCO
Termination Fee") of $25,000,000 if this Agreement is terminated pursuant to
(i) Section 8.01(b)(iii) because the SOCO Stockholders' Approval is not
obtained, (ii) Section 8.01(e) or Section 8.01(g), or (iii) Section 8.01(d) in
respect of a breach by SOCO of a covenant or agreement that is a SOCO Breach
(as defined in Section 8.01(d)) and, in the case of clause (i) or (iii), if
within nine months of any such termination SOCO becomes a subsidiary of a
person, which person, immediately prior to SOCO becoming such a subsidiary, was
not an Affiliate of Santa Fe or SOCO, or accepts a written offer with respect
to, or enters into a written agreement to consummate or consummates, a SOCO
Acquisition Proposal. If the SOCO Termination Fee becomes payable pursuant to
this Section 6.04(c), it shall be paid prior to or at termination (and as a
condition to termination) of this Agreement in the case of clause (ii) above
and, in the case of clause (i) or (iii) above, it shall be paid upon the
acceptance of a written offer relating to, or the signing of a definitive
agreement relating to, a SOCO Acquisition Proposal or, if no such acceptance is
made or agreement is signed, then at the closing (and as a condition to
closing) of either SOCO becoming a subsidiary of a person, which person,
immediately prior to SOCO becoming such a subsidiary, was not an Affiliate of
Santa Fe or SOCO, or of such SOCO Acquisition Proposal. The SOCO Termination
Fee shall be paid by SOCO without reservation of rights or protests and SOCO,
upon making such payment, shall be deemed to have released and waived any and
all rights that it may have to recover such amounts. Santa Fe shall be entitled
to receive all Expenses incurred by it (in addition to the SOCO Termination
Fee, if payable) in immediately available funds if this Agreement is terminated
pursuant to Section 8.01(e), Section 8.01(g), Section 8.01(b)(iii) because the
SOCO Stockholders' Approval is not obtained or Section 8.01(d).
 
   (d) Santa Fe shall pay SOCO a fee in immediately available funds (a "Santa
Fe Termination Fee") of $25,000,000 if this Agreement is terminated pursuant to
(i) Section 8.01(b)(iii) because the Santa Fe Stockholders' Approval is not
obtained, (ii) Section 8.01(f) or Section 8.01(h), or (iii) Section 8.01(c) in
respect of a breach by Santa Fe of a covenant or agreement that is, a Santa Fe
Breach (as defined in Section 8.01(c)) and, in the case of clause (i) or (iii),
if within nine months of any such termination Santa Fe becomes a subsidiary of
a person, which person, immediately prior to Santa Fe becoming such a
subsidiary, was not an Affiliate of SOCO or Santa Fe, or accepts a written
offer with respect to, or enters into a written agreement to consummate or
consummates, a Santa Fe Acquisition Proposal. If the Santa Fe Termination Fee
becomes payable pursuant to this Section 6.04(d), it shall be paid prior to or
at termination (and as a condition to termination) of this Agreement in the
case of clause (ii) above and, in the case of clause (i) or (iii) above, it
shall be paid upon the acceptance of a written offer relating to, or the
signing of a definitive agreement relating to a Santa Fe Acquisition Proposal
or, if no such acceptance is made or agreement is signed, then at the closing
(and as a condition to closing) of either Santa Fe becoming a subsidiary of a
person, which person,
 
                                      A-31
<PAGE>
 
immediately prior to Santa Fe becoming such a subsidiary, was not an Affiliate
of SOCO or Santa Fe, or of such Santa Fe Acquisition Proposal. The Santa Fe
Termination Fee shall be paid by Santa Fe without reservation of rights or
protests and Santa Fe, upon making such payment, shall be deemed to have
released and waived any and all rights that it may have to recover such
amounts. SOCO shall be entitled to receive all Expenses incurred by it (in
addition to the Santa Fe Termination Fee, if payable) in immediately available
funds if this Agreement is terminated pursuant to Section 8.01(f), Section
8.01(h), Section 8.01(b)(iii) because the Santa Fe Stockholders' Approval is
not obtained or Section 8.01(c).
 
   (e) The parties hereto agree that any amounts paid in accordance with
Section 6.04(c) or 6.04(d) above shall constitute the sole or exclusive remedy
available to a party for a breach by the other party of any representation,
warranty, covenant or agreement of such other party in this Agreement, other
than a breach arising from an intentional, reckless or grossly negligent action
by such other party.
 
   Section 6.05 Cooperation. Subject to compliance with applicable law, from
the date hereof until the Effective Time, each of the parties hereto shall
confer on a regular and frequent basis with one or more representatives of the
other parties to report operational matters of materiality and the general
status of ongoing operations and shall promptly provide the other party or its
counsel with copies of all filings made by such party with any Governmental
Authority in connection with this Agreement and the transactions contemplated
hereby.
 
   Section 6.06 Filings. Each party hereto shall make all filings required to
be made by such party in connection herewith or desirable to achieve the
purposes contemplated hereby, and shall cooperate as needed with respect to any
such filing by any other party hereto.
 
   Section 6.07 Consents. Each of Santa Fe and SOCO shall use all reasonable
commercial efforts to obtain all consents necessary or advisable in connection
with its obligations hereunder.
 
   Section 6.08 Board, Committees and Executive Officers.
 
   (a) Santa Fe shall take such action as shall be required to cause the Board
of Directors immediately after the Effective Time to increase to 11 members
that are divided into three classes, the first class consisting of directors
whose current term expires at the 1999 Annual Meeting of Stockholders ("Class
I"), the second class consisting of directors whose current term expires at the
2000 Annual Meeting of Stockholders ("Class II") and the third class consisting
of directors whose current term expires at the 2001 Annual Meeting of
Stockholders ("Class III"), which classes shall have the respective terms set
forth in Santa Fe's Charter or Bylaws. Prior to the mailing to stockholders of
the Proxy Statement/Prospectus (as defined herein), (i) the Santa Fe Board of
Directors shall nominate as directors of Santa Fe to fill the vacancies created
thereby one individual selected by the Board of Directors of SOCO as a member
of Class I, two individuals selected by the Board of Directors of SOCO as
members of Class II and two individuals selected by the Board of Directors of
SOCO as members of Class III (the "SOCO Director Nominees") to stand for
election as directors of Santa Fe at the Santa Fe Special Meeting. If an
individual so selected and nominated consents to serve as a director, Santa Fe
shall use all reasonable commercial efforts to cause such individual to be
elected to its Board of Directors by the Santa Fe stockholders at the Santa Fe
Special Meeting (as defined in Section 6.09(b)), effective as of the Effective
Time, for a term expiring at Santa Fe's next annual meeting of stockholders
following the Effective Time at which the term of the class to which such
director belongs expires, subject to being renominated as a director at the
discretion of Santa Fe's Board of Directors. If at any time prior to the
Effective Time, any SOCO Director Nominee shall be unable to serve as a
director at the Effective Time, the Board of Directors of SOCO shall designate
another individual to serve in such individual's place.
 
   (b) Commencing immediately after the Effective Time, John C. Snyder shall be
Chairman of the Board of Directors of the Surviving Corporation for which he
shall be paid a monthly fee of $10,000 for so long as he serves in such
capacity, and those individuals set forth on Exhibit 6.08(b) hereto shall be
executive officers of Santa Fe having the titles and positions set forth
opposite their respective names on such Exhibit until the
 
                                      A-32
<PAGE>
 
earlier of the resignation or removal of any such individual or until their
respective successors are duly elected and qualified, as the case may be. SOCO
and Santa Fe agree that John C. Snyder shall continue to serve as Chairman of
the Board until the first to occur of (i) the annual meeting of the
stockholders of the Surviving Corporation held in the year 2000 and (ii) his
death, resignation or removal as a director. Prior to the Effective Time, Santa
Fe and SOCO may mutually agree to designate additional individuals to serve as
executive officers of Santa Fe subsequent to the Effective Time. If any
executive officer set forth on Exhibit 6.08(b) or designated in accordance with
this Section 6.08(b) ceases to be a full-time employee of either Santa Fe or
SOCO (or otherwise declines to serve in such designated capacity) before the
Effective Time, Santa Fe and SOCO will agree upon another person to serve in
such person's stead.
 
   (c) Prior to mailing of the definitive Proxy Statement/Prospectus to their
respective stockholders, SOCO and Santa Fe will agree upon the composition that
the various committees of the Board of Directors of the Surviving Corporation
will have upon consummation of the Merger and the definitive Proxy
Statement/Prospectus will identify such committees and their respective
members. Santa Fe and SOCO agree that the Nominating Committee of the Board of
Directors of the Surviving Corporation shall consist of John C. Snyder, James
L. Payne and two additional members of the Board of Directors of the Surviving
Corporation, of which one will be selected by Mr. Snyder and the other by Mr.
Payne. Each such member of the Nominating Committee shall continue to serve as
members of the Nominating Committee until the first to occur of (i) the annual
meeting of the stockholders of the Surviving Corporation held in the year 2000
and (ii) the death, resignation or removal of such person.
 
   Section 6.09 Stockholder Meetings.
 
   (a) Subject to Section 6.02(b), SOCO shall, as promptly as reasonably
practicable after the date hereof (i) take all steps reasonably necessary to
call, give notice of, convene and hold a special meeting of its stockholders
(the "SOCO Special Meeting") for the purpose of securing the SOCO Stockholders'
Approval, (ii) distribute to its stockholders the Proxy Statement/Prospectus in
accordance with applicable federal and state law and with its certificate of
incorporation and bylaws, which Proxy Statement/Prospectus shall contain the
recommendation of the Board of Directors of SOCO that its stockholders approve
and adopt this Agreement and the transactions contemplated hereby, (iii) use
all reasonable commercial efforts to solicit from its stockholders proxies in
favor of the approval and adoption of the this Agreement and the transactions
contemplated hereby and to secure the SOCO Stockholder's Approval, and (iv)
cooperate and consult with Santa Fe with respect to each of the foregoing
matters.
 
   (b) Subject to Section 6.02(a), Santa Fe shall, as promptly as reasonably
practicable after the date hereof (i) take all steps reasonably necessary to
call, give notice of, convene and hold a special meeting of its stockholders
(the "Santa Fe Special Meeting") for the purpose of securing the Santa Fe
Stockholders' Approval, (ii) distribute to its stockholders the Proxy
Statement/Prospectus in accordance with applicable federal and state law and
its articles of incorporation and bylaws, which Proxy Statement/Prospectus
shall contain the recommendation of the Santa Fe Board of Directors that its
stockholders approve this Agreement and the election of directors described in
Section 6.08 and (iii) use all reasonable commercial efforts to solicit from
its stockholders proxies in favor of approval of this Agreement and the
election of directors described in Section 6.08 and to secure the Santa Fe
Stockholders' Approval, and (iv) cooperate and consult with SOCO with respect
to each of the foregoing matters.
 
   (c) The Santa Fe Special Meeting and the SOCO Special Meeting shall be held
on the same day unless otherwise agreed by Santa Fe and SOCO.
 
   Section 6.10 Preparation of the Proxy Statement/Prospectus and Registration
Statement.
 
   (a) Santa Fe and SOCO shall promptly prepare and file with the SEC a
preliminary version of the Proxy Statement/Prospectus and will use all
reasonable commercial efforts to respond to the comments of the SEC in
connection therewith and to furnish all information required to prepare the
definitive Proxy
 
                                      A-33
<PAGE>
 
Statement/Prospectus. At any time from (and including, without limitation) the
initial filing with the SEC of the Proxy Statement/Prospectus, Santa Fe shall
file with the SEC the Registration Statement containing the Proxy
Statement/Prospectus so long as Santa Fe shall have provided to SOCO a copy of
the Registration Statement containing the Proxy Statement/Prospectus at least
10 days prior to any filing thereof and any supplement or amendment at least
two days prior to any filing thereof. Subject to the foregoing sentence, the
date that the Registration Statement is filed with SEC shall be determined
jointly by Santa Fe and SOCO. Each of Santa Fe and SOCO shall use all
reasonable commercial efforts to have the Registration Statement declared
effective under the Securities Act as promptly as practicable after such
filing. Santa Fe shall also take any action (other than qualifying to do
business in any jurisdiction in which it is not now so qualified or filing a
general consent to service of process in any jurisdiction required or filing a
general consent to service or process in any jurisdiction) required to be taken
under applicable state securities laws in connection with the issuance of Santa
Fe Common Stock in the Merger and SOCO shall furnish all information concerning
SOCO and the holders of shares of SOCO capital stock as may be reasonably
requested in connection with any such action. Promptly after the effectiveness
of the Registration Statement, each of Santa Fe and SOCO shall cause the Proxy
Statement/Prospectus to be mailed to its respective stockholders, and if
necessary, after the definitive Proxy Statement/Prospectus shall have been
mailed, promptly circulate amended, supplemented or supplemental proxy
materials and, if required in connection therewith, resolicit proxies. Santa Fe
shall advise SOCO and SOCO shall advise Santa Fe, as applicable, promptly after
it receives notice thereof, of the time when the Registration Statement shall
become effective or any supplement or amendment has been filed, the issuance of
any stop order, the suspension of the qualification of the Santa Fe Common
Stock for offering in any jurisdiction, or any request by the SEC for amendment
of the Proxy Statement/Prospectus or the Registration Statement or comments
thereon and responses thereto or requests by the SEC for additional
information.
 
   (b) None of the information to be supplied by SOCO for inclusion in (a) the
joint proxy statement relating to the SOCO Special Meeting and the Santa Fe
Special Meeting (as defined in Section 6.09(a) and 6.09(b), respectively) (also
constituting the prospectus in respect of Santa Fe Common Stock into which
shares of SOCO Common Stock will be converted) (the "Proxy
Statement/Prospectus"), to be filed by SOCO and Santa Fe with the SEC, and any
amendments or supplements thereto, or (b) the Registration Statement on Form S-
4 (the "Registration Statement") to be filed by Santa Fe with the SEC in
connection with the Merger, and any amendments or supplements thereto, will, at
the respective times such documents are filed, and, in the case of the Proxy
Statement/Prospectus, at the time the Proxy Statement/Prospectus or any
amendment or supplement thereto is first mailed to stockholders of SOCO, at the
time such stockholders vote on approval and adoption of this Agreement and at
the Effective Time, and, in the case of the Registration Statement, when it
becomes effective under the 1933 Act, contain any untrue statement of a
material fact or omit to state any material fact required to be made therein or
necessary in order to make the statements made therein, in light of the
circumstances under which they were made, not misleading.
 
   (c) None of the information to be supplied by Santa Fe for inclusion in (a)
the Proxy Statement/Prospectus, to be filed by SOCO and Santa Fe with the SEC,
and any amendments or supplements thereto, or (b) the Registration Statement to
be filed by Santa Fe with the SEC in connection with the Merger, and any
amendments or supplements thereto, will, at the respective times such documents
are filed, and, in the case of the Proxy Statement/Prospectus, at the time the
Proxy Statement/Prospectus or any amendment or supplement thereto is first
mailed to stockholders of Santa Fe, at the time such stockholders vote on
approval and adoption of this Agreement and at the Effective Time, and, in the
case of the Registration Statement, when it becomes effective under the 1933
Act, contain any untrue statement of a material fact or omit to state any
material fact required to be made therein or necessary in order to make the
statements made therein, in light of the circumstances under which they were
made, not misleading.
 
   (d) Following receipt by PricewaterhouseCoopers, Santa Fe's independent
auditors, of an appropriate request from SOCO pursuant to SAS No. 72, Santa Fe
shall use all reasonable commercial efforts to cause to be delivered to SOCO a
letter of PricewaterhouseCoopers, dated a date within two business days before
the effective date of the Registration Statement, and addressed to SOCO, in
form and substance reasonably
 
                                      A-34
<PAGE>
 
satisfactory to SOCO and customary in scope and substance for "cold comfort"
letters delivered by independent public accountants in connection with
registration statements and proxy statements similar to the Proxy
Statement/Prospectus.
 
   (e) Following receipt by Arthur Andersen LLP, SOCO's independent auditors,
of an appropriate request from Santa Fe pursuant to SAS No. 72, SOCO shall use
all reasonable commercial efforts to cause to be delivered to Santa Fe a letter
of Arthur Andersen LLP, dated a date within two business days before the
effective date of the Registration Statement, and addressed to Santa Fe in form
and substance satisfactory to Santa Fe and customary in scope and substance for
"cold comfort" letters delivered by independent public accountants in
connection with registration statements and proxy statements similar to the
Proxy Statement/Prospectus.
 
   Section 6.11 Stock Exchange Listing. Santa Fe shall use its reasonable
commercial efforts to cause the shares of Santa Fe Common Stock to be issued in
connection with the Merger (and the shares of Santa Fe Common Stock underlying
substitute options) to be listed on the NYSE, subject to official notice of
issuance.
 
   Section 6.12 Employee Benefits. (a) It is the intent of the parties that the
Surviving Corporation will establish, as soon as reasonably practicable on or
after the Effective Time, compensation and employee benefit plan programs for
the continuing employees of the Surviving Corporation that, except as provided
below, will provide similarly situated employees with compensation and benefits
on substantially the same basis to the extent reasonably practicable; i.e.,
employees of Santa Fe and SOCO shall receive levels of employee compensation
and employee benefits which are, in the aggregate (taking into account all
types of direct and indirect compensation, including base compensation,
incentive compensation and benefit plan participation), as comparable as
practicable to other employees of similar position, responsibility, pay grade,
length of service and performance level. Until such programs are established,
the Surviving Corporation shall provide that the continuing employees shall be
eligible to continue to participate (subject to satisfaction of the eligibility
provisions of any such plan) in the respective employee benefit plans of Santa
Fe or SOCO, as the case may be, or shall be eligible to participate in any
combination of such plans or new plans as the Surviving Corporation deems
appropriate. Nothing in this Section 6.12(a) shall prohibit the Surviving
Corporation from maintaining separate or different benefit plans for employees
of Santa Fe and SOCO, from amending, terminating or consolidating any existing
employee benefit plans, or from creating new employee benefit plans, subject in
each case to the continuing applicability of the foregoing provisions of this
Section 6.12(a). The employees of SOCO shall be given credit for their service
with SOCO prior to the Effective Time for all purposes under the compensation
and employee benefit plans of the Surviving Corporation, other than the accrual
of benefits under any defined benefit plan. Notwithstanding the foregoing, any
member of senior management of SOCO continuing employment with the Surviving
Corporation who is receiving compensation and benefits immediately prior to the
Effective Time in excess of that being received at the Effective Time by a
similarly situated Santa Fe employee shall be entitled to continue to receive
such level of compensation and benefits, but shall not be eligible for positive
compensation and benefits adjustments until the compensation and benefits of
such former member of SOCO's senior management are in the aggregate equal to
that received by a similarly situated Santa Fe employee.
 
   (b) An employee of SOCO who (i) is involuntarily terminated after the date
of this Agreement and either on or before, but in contemplation of, the Merger,
or (ii) becomes an employee of the Surviving Corporation and is terminated
within twelve months following the Effective Time, shall be eligible to elect
to receive benefits under either the Santa Fe severance plan or the SOCO
severance plan, but not both plans; provided, however, in no event shall such
employee be entitled to less than 12 weeks severance pay. For purposes of this
Section 6.12(b), the SOCO severance plan shall refer to the SOCO Change in
Control Severance Plan.
 
   (c) Any SOCO employee who is a party to a change in control agreement or
employment agreement ("SOCO Agreement") and is terminated on or prior to the
Effective Time or not offered continuing employment with the Surviving
Corporation shall be entitled to severance benefits only to the extent so
provided by his SOCO Agreement, and shall not be eligible to receive severance
benefits pursuant to Section
 
                                      A-35
<PAGE>
 
6.12(b). Any SOCO employee who is offered employment with the Surviving
Corporation as a condition thereto shall surrender his SOCO Agreement in
exchange for an employment agreement with Santa Fe ("Santa Fe Agreement")
containing the severance and other terms (other than as to title and
compensation) available to similarly situated employees within Santa Fe. For
purposes of all Santa Fe Agreements issued upon surrender of SOCO Agreements,
(i) the Merger shall be deemed to constitute a "Change in Control" thereunder,
and (ii) for those SOCO employees required to locate to Houston or otherwise
experiencing a "Change in Duties" (as defined under any SOCO Agreement), "Good
Reason" shall be deemed to exist entitling the employee to terminate the
employee's employment with Santa Fe for two years following the Effective Time
and receive the compensation and benefits provided in Paragraph 7(c)(i) of the
Santa Fe Agreements currently in effect.
 
   (d) Following the Effective Time, former SOCO employees (other than William
G. Hargett) who are employed by the Surviving Corporation shall be eligible for
grants, commensurate with grants provided to similarly situated Santa Fe
employees under the applicable stock option plans maintained by the Surviving
Corporation. Notwithstanding the foregoing, persons who were employees of SOCO
immediately prior to the Effective Time (including William G. Hargett) and who
become employees of the Surviving Corporation shall receive an annual grant
during the summer of 1999 on terms as established by past practices of Santa Fe
and commensurate with grants usually provided to similarly situated Santa Fe
employees, regardless of whether Santa Fe employees receive an annual grant
during the summer of 1999, subject to the availability of shares under the
applicable stock option plans of the Surviving Corporation.
 
   Section 6.13 Reasonable Commercial Efforts. Subject to the terms and
conditions of this Agreement, each party will use all reasonable commercial
efforts to take, or cause to be taken, all actions and to do, or cause to be
done, all things necessary, proper or advisable under applicable laws and
regulations to consummate the transactions contemplated by this Agreement.
 
   Section 6.14 Certain Filings. SOCO and Santa Fe shall cooperate with one
another (i) in connection with the preparation of the Proxy
Statement/Prospectus and the Registration Statement and the filing(s) necessary
under the HSR Act, (ii) in determining whether any action by or in respect of,
or filing with, any governmental body, agency, official, or authority is
required, or any actions, consents, approvals or waivers are required to be
obtained from parties to any material contracts in connection with the
consummation of the transactions contemplated by this Agreement and (iii) in
taking such actions or making any such filings, furnishing information required
in connection therewith or with the Proxy Statement/Prospectus, the
Registration Statement or the HSR Act and seeking timely to obtain any such
actions, consents, approvals, waivers or early termination of the applicable
waiting periods under the HSR Act.
 
   Section 6.15 Public Announcements. Santa Fe and SOCO will consult with each
other before issuing any press release or making any public statement with
respect to this Agreement or the transactions contemplated hereby. Except as
may be required by applicable law or any listing agreement with any national
securities exchange as advised by counsel, neither Santa Fe nor SOCO will issue
any such press release or make any such public statement prior to such
consultation.
 
   Section 6.16 Further Assurances. At and after the Effective Time, the
officers and directors of the Surviving Corporation will be authorized to
execute and deliver, in the name and on behalf of SOCO or Santa Fe, any deeds,
bills of sale, assignments or assurances and to take and do, in the name and on
behalf of SOCO or Santa Fe, any other actions and things to vest, perfect or
confirm of record or otherwise in the Surviving Corporation any and all right,
title and interest in, to and under any of the rights, properties or assets of
SOCO acquired or to be acquired by the Surviving Corporation as a result of, or
in connection with, the Merger.
 
   Section 6.17 Notices of Certain Events. Each of SOCO and Santa Fe shall
promptly notify the other party hereto of:
 
     (a) any notice or other communication from any person alleging that the
  consent of such person is or may be required in connection with the
  transactions contemplated by this Agreement;
 
                                      A-36
<PAGE>
 
     (b) any notice or other communication from any governmental or
  regulatory agency or authority in connection with the transactions
  contemplated by this Agreement; and
 
     (c) any actions, suits, claims, investigations or proceedings commenced
  or, to its knowledge threatened against, relating to or involving or
  otherwise affecting such party that, if pending on the date of this
  Agreement, would have been required to have been disclosed pursuant to
  Sections 3.11, 3.12, 3.14, 3.16, 3.20, 4.11, 4.12, 4.14, 4.16 or 4.20 (as
  the case may be) or that relate to the consummation of the transactions
  contemplated by this Agreement.
 
   Section 6.18 Tax-free Reorganization. Prior to the Effective Time, each
party shall use all reasonable commercial efforts to cause the Merger to
qualify as a 368 Reorganization, and will not take any action reasonably likely
to cause the Merger not to so qualify.
 
   Section 6.19 Affiliates. Within 45 days following the date of this
Agreement, SOCO shall deliver to Santa Fe a letter identifying all known
persons who may be deemed affiliates of SOCO under Rule 145 of the 1933 Act.
SOCO shall use its reasonable commercial efforts to obtain a written agreement
from each person who may be so deemed as soon as practicable and, in any event,
at least 30 days prior to the Effective Time, substantially in the form of
Exhibit A hereto.
 
   Section 6.20 Stockholder Litigation. Each of Santa Fe and SOCO shall give
the other the reasonable opportunity to participate in the defense of any
litigation against Santa Fe or SOCO, as applicable, and its directors relating
to the transactions contemplated by this Agreement.
 
   Section 6.21 Indenture Matters. Santa Fe and SOCO shall, and shall cause
their respective subsidiaries to, take all actions that are necessary or
appropriate (as mutually agreed by Santa Fe and SOCO) in order for the
Surviving Corporation to succeed to, assume, guarantee or modify (as required
or as Santa Fe and SOCO determine to be appropriate) the agreements governing
the outstanding publicly held debt securities of SOCO referred to in the SOCO
SEC Filings in order to avoid defaults thereunder.
 
                                  ARTICLE VII
 
                            Conditions to the Merger
 
   Section 7.01 Conditions to the Obligations of Each Party. The obligations of
SOCO and Santa Fe to consummate the Merger are subject to the satisfaction of
the following conditions:
 
     (a) the SOCO Stockholders' Approval and Santa Fe Stockholders' Approval
  shall have been obtained;
 
     (b) any applicable waiting period under the HSR Act relating to the
  Merger shall have expired or been terminated;
 
     (c) no provision of any applicable law or regulation and no judgment,
  injunction, order or decree shall prohibit the consummation of the Merger;
 
     (d) the Registration Statement shall have been declared effective and no
  stop order suspending the effectiveness of the Registration Statement shall
  be in effect and no proceedings for such purpose shall be pending before or
  threatened by the SEC; and
 
     (e) the shares of Santa Fe Common Stock to be issued in the Merger shall
  have been approved for listing on the NYSE, subject to official notice of
  issuance.
 
   Section 7.02 Conditions to the Obligations of Santa Fe. The obligations of
Santa Fe to consummate the Merger are subject to the satisfaction of the
following further conditions:
 
     (a) SOCO shall have performed in all material respects all of its
  obligations hereunder required to be performed by it at or prior to the
  Effective Time, each of the representations and warranties of SOCO
 
                                      A-37
<PAGE>
 
  contained in this Agreement and in any certificate or other writing
  delivered by SOCO pursuant hereto that is qualified as to materiality shall
  be true in all respects and each of those that is not so qualified shall be
  true in all material respects at and as of the Effective Time as if made at
  and as of such time (except that the accuracy of representations and
  warranties that by their terms speak as of a specified date other than as
  of the date of this Agreement will be determined as of such specified date)
  and Santa Fe shall have received a certificate signed by an executive
  officer of SOCO (which certificate shall not impose any personal liability
  on such officer) to the foregoing effect;
 
     (b) All proceedings to be taken by SOCO in connection with the
  transactions contemplated by this Agreement and all documents, instruments
  and certificates to be delivered by SOCO in connection with the
  transactions contemplated by this Agreement shall be reasonably
  satisfactory in form and substance to Santa Fe and its counsel;
 
     (c) Santa Fe shall have received an opinion of Andrews & Kurth LLP in
  form and substance reasonably satisfactory to Santa Fe, on the basis of
  certain facts, representations and assumptions set forth in such opinion,
  dated the Effective Time, to the effect that (i) the Merger will be treated
  for federal income tax purposes as a 368 Reorganization, (ii) Santa Fe and
  SOCO will each be a party to that reorganization and (iii) no gain or loss
  will be recognized by Santa Fe or SOCO by reason of the Merger.
 
   Section 7.03 Conditions to the Obligations of SOCO. The obligations of SOCO
to consummate the Merger are subject to the satisfaction of the following
further conditions:
 
     (a) Santa Fe shall have performed in all material respects all of its
  obligations hereunder required to be performed by it at or prior to the
  Effective Time, each of the representations and warranties of Santa Fe
  contained in this Agreement and in any certificate or other writing
  delivered by Santa Fe pursuant hereto that is qualified as to materiality
  shall be true in all respects and each of those that is not so qualified
  shall be true in all material respects at and as of the Effective Time as
  if made at and as of such time (except that the accuracy of representations
  and warranties that by their terms speak as of a specified date other than
  as of the date of this Agreement will be determined as of such specified
  date) and SOCO shall have received a certificate signed by an executive
  officer of Santa Fe (which certificate shall not impose any personal
  liability on such officer) to the foregoing effect;
 
     (b) All proceedings to be taken by Santa Fe in connection with the
  transactions contemplated by this Agreement and all documents, instruments
  and certificates to be delivered by Santa Fe in connection with the
  transactions contemplated by this Agreement shall be reasonably
  satisfactory in form and substance to SOCO and its counsel; and
 
     (c) SOCO shall have received an opinion of Vinson & Elkins L.L.P., in
  form and substance reasonably satisfactory to SOCO, on the basis of certain
  facts, representations and assumptions set forth in such opinion, dated the
  Effective Time, to the effect that (i) the Merger will be treated for
  federal income tax purposes as a 368 Reorganization, (ii) Santa Fe and SOCO
  will each be a party to that reorganization, (iii) no gain or loss will be
  recognized by SOCO by reason of the Merger, and (iv) no gain or loss will
  be recognized by holders of SOCO Common Stock by reason of the Merger upon
  the conversion of shares of SOCO Common Stock into Santa Fe Common Stock,
  except with respect to cash received in lieu of fractional shares.
 
                                  ARTICLE VIII
 
                                  Termination
 
   Section 8.01 Termination. This Agreement may be terminated and the Merger
may be abandoned at any time prior to the Effective Time (notwithstanding any
approval of this Agreement by the Board of Directors of SOCO or Santa Fe or the
stockholders of SOCO or Santa Fe):
 
     (a) by mutual written agreement of SOCO and Santa Fe;
 
                                      A-38
<PAGE>
 
     (b) by either SOCO or Santa Fe, if
 
       (i) the Effective Time of the Merger shall not have occurred on or
    before June 30, 1999; provided that the right to terminate this
    Agreement pursuant to this Section 8.01(b)(i) shall not be available to
    any party whose breach of any covenant or agreement of such party
    results in the failure of the Merger to be consummated by such time;
 
       (ii) there shall be any law, rule or regulation that makes
    consummation of the Merger illegal or otherwise prohibited or if any
    judgment, injunction, order or decree enjoining any party from
    consummating the Merger is entered and such judgment, injunction, order
    or decree shall have become final and non-appealable; or
 
       (iii) if, at a duly held meeting of stockholders or at any
    adjournment or postponement thereof, the SOCO Stockholders' Approval or
    the Santa Fe Stockholders' Approval referred to in Section 3.23 and
    Section 4.23, respectively, shall not have been obtained by reason of
    the failure to obtain the requisite vote;
 
     (c) by SOCO if there has been a breach by Santa Fe of (i) any
  representation, warranty, covenant or agreement set forth in this Agreement
  such that the condition set forth in Section 7.03(a) would not be satisfied
  if the Effective Time were deemed to occur on the date notice of such
  breach is given by SOCO to Santa Fe, which breach has not been cured in all
  material respects within 20 business days following receipt by Santa Fe of
  notice of such breach (a "Santa Fe Breach");
 
     (d) by Santa Fe, if there has been a breach by SOCO of (i) any
  representation, warranty, covenant or agreement set forth in this Agreement
  such that the condition set forth in Section 7.02(a) would not be satisfied
  if the Effective Time were deemed to occur on the date notice of such
  breach is given by Santa Fe to SOCO, which breach has not been cured in all
  material respects within 20 business days following receipt by SOCO of
  notice of such breach (a "SOCO Breach");
 
     (e) by Santa Fe, if (i) the Board of Directors of SOCO withdraws,
  modifies or changes its recommendation of this Agreement or the Merger in a
  manner adverse to Santa Fe or shall have resolved to do any of the
  foregoing or the Board of Directors of SOCO shall have recommended to the
  stockholders of SOCO any SOCO Acquisition Proposal or resolved to do so; or
  (ii) a tender offer or exchange offer for outstanding shares of capital
  stock of SOCO then representing 50% or more of the power to vote generally
  for the election of directors is commenced, and the Board of Directors of
  SOCO does not, within the applicable period required by law, recommend that
  stockholders not tender their shares into such tender or exchange offer;
 
     (f) by SOCO, if (i) the Board of Directors of Santa Fe withdraws,
  modifies or changes its recommendation of this Agreement or the Merger in a
  manner adverse to SOCO or shall have resolved to do any of the foregoing or
  the Board of Directors of Santa Fe shall have recommended to the
  stockholders of Santa Fe any Santa Fe Acquisition Proposal or resolved to
  do so; or (ii) a tender offer or exchange offer for outstanding shares of
  capital stock of Santa Fe then representing 50% or more of the power to
  vote generally for the election of directors is commenced, and the Board of
  Directors of Santa Fe does not, within the applicable period required by
  law, recommend that stockholders not tender their shares into such tender
  or exchange offer;
 
     (g) by SOCO or Santa Fe, if SOCO accepts a Superior SOCO Acquisition
  Proposal and makes payment of the SOCO Termination Fee and the Expenses
  required by Section 6.04(c); provided, however, that SOCO shall not be
  permitted to terminate this Agreement pursuant to this Section 8.01(g)
  unless (i) it has complied with the requirements of Section 6.02(b), (ii)
  it has provided Santa Fe with two business days prior written notice of its
  intent to so terminate this Agreement together with a detailed summary of
  the terms and conditions of such Superior SOCO Acquisition Proposal, (iii)
  prior to any such termination, SOCO shall, and shall cause its respective
  financial and legal advisors to, use all reasonable commercial efforts to
  negotiate in good faith with Santa Fe to make such adjustments in the terms
  and conditions of this Agreement as would enable SOCO to proceed with the
  transactions contemplated herein, and (iv) the
 
                                      A-39
<PAGE>
 
  SOCO Board of Directors shall have concluded in good faith, after duly
  considering advice of outside counsel of SOCO, that notwithstanding all
  concessions that may be offered by Santa Fe in the negotiations entered
  into pursuant to clause (iii) above, such action is necessary for the SOCO
  Board of Directors to act in a manner consistent with its fiduciary duties
  under applicable law;
 
     (h) by Santa Fe or SOCO, if Santa Fe accepts a Superior Santa Fe
  Acquisition Proposal and makes payment of the Santa Fe Termination Fee and
  the Expenses required by Section 6.04(d); provided, however, that Santa Fe
  shall not be permitted to terminate this Agreement pursuant to this Section
  8.01(h) unless (i) it has complied with the requirements of Section
  6.02(a), (ii) it has provided SOCO with two business days prior written
  notice of its intent to so terminate this Agreement together with a
  detailed summary of the terms and conditions of such Superior Santa Fe
  Acquisition Proposal, (iii) prior to any such termination, Santa Fe shall,
  and shall cause its respective financial and legal advisors to, use all
  reasonable commercial efforts to negotiate in good faith with SOCO to make
  such adjustments in the terms and conditions of this Agreement as would
  enable Santa Fe to proceed with the transactions contemplated herein, and
  (iv) the Santa Fe Board of Directors shall have concluded in good faith,
  after duly considering advice of outside counsel of Santa Fe, that
  notwithstanding all concessions that may be offered by SOCO in the
  negotiations entered into pursuant to clause (iii) above, such action is
  necessary for the Santa Fe Board of Directors to act in a manner consistent
  with its fiduciary duties under applicable law.
 
   Section 8.02 Effect of Termination. If this Agreement is terminated pursuant
to Section 8.01, this Agreement shall become void and of no effect with no
liability on the part of any party hereto, except that (i) the agreements
contained in this Section 8.02, the last sentence of Section 6.01 and Sections
6.04, 6.10(b), 6.10(c), 6.15, 6.20, 9.01, 9.05, 9.06, 9.07, 9.08, 9.09, 9.10,
9.11, 9.12, 9.13, 9.14 and 9.15 shall survive the termination hereof and (ii)
no such termination shall release any party of any liabilities or damages
resulting from any intentional, reckless or grossly negligent action by that
party resulting in a breach of any provision of this Agreement.
 
                                   ARTICLE IX
 
                                 Miscellaneous
 
   Section 9.01 Notices. All notices, requests and other communications to any
party hereunder shall be in writing (including, without limitation, facsimile
transmission) and shall be given,
 
   If to Santa Fe, to:
 
     Santa Fe Energy Resources, Inc.
     1616 South Voss Road
     10th Floor
     Houston, Texas 77057
     Attention:David L. Hicks
               Vice President, Law and General Counsel
     Facsimile No.: 713.507.5341
 
   with a copy to:
 
     Andrews & Kurth L.L.P.
     600 Travis, Suite 4200
     Houston, Texas 77002
     Attention: G. Michael O'Leary
     Facsimile No.: 713.220.4285
 
                                      A-40
<PAGE>
 
   If to SOCO, to:
 
     Snyder Oil Corporation
     777 Main Street
     Suite 1400
     Fort Worth, Texas 76102
     Attention: John H. Karnes
              Vice President and General Counsel
     Facsimile No.: 817.882.5905
 
   with a copy to:
 
     Vinson & Elkins L.L.P.
     3700 Trammell Crow Center
     2001 Ross Avenue
     Dallas, Texas 75201-2975
     Attention: Jeffrey E. Eldredge
     Facsimile No.: 214.999.7708
 
or such other address or fax number as such party may hereafter specify for the
purpose by notice to the other parties hereto. All such notices, requests and
other communications shall be deemed received on the date of receipt by the
recipient thereof if received prior to 5:00 p.m. in the place of receipt and
such day is a business day in the place of receipt. Otherwise, any such notice,
request or communication shall be deemed not to have been received until the
next succeeding business day in the place of receipt.
 
   Section 9.02 Survival of Representations and Warranties. The representations
and warranties and agreements contained herein and in any certificate or other
writing delivered pursuant hereto shall not survive the Effective Time except
for the agreements set forth in Sections 6.03, 6.08(b), 6.08(c), 6.12, 9.05,
9.06, 9.07, 9.08, 9.09 and 9.10.
 
   Section 9.03 Amendments; No Waivers. (a) Any provision of this Agreement may
be amended or waived prior to the Effective Time if, but only if, such
amendment or waiver is in writing and is signed, in the case of an amendment,
by each party to this Agreement or in the case of a waiver, by the party
against whom the waiver is to be effective; provided that (i) after the
approval and adoption of this Agreement by the stockholders of SOCO, no such
amendment or waiver shall, without the further approval of such stockholders,
reduce the amount or change the kind of consideration to be received in
exchange for any shares of capital stock of SOCO and (ii) after the approval
and adoption of this Agreement by the stockholders of Santa Fe, no such
amendment or waiver shall, without the further approval of such stockholders,
modify or change the Exchange Ratio in a manner adverse to Santa Fe's
stockholders.
 
   (b) No failure or delay by any party in exercising any right, power or
privilege hereunder shall operate as a waiver thereof nor shall any single or
partial exercise thereof preclude any other or further exercise thereof or the
exercise of any other right, power or privilege. The rights and remedies herein
provided shall be cumulative and not exclusive of any rights or remedies
provided by law.
 
   Section 9.04 Successors and Assigns. The provisions of this Agreement shall
be binding upon and inure to the benefit of the parties hereto and their
respective successors and assigns, provided that no party may assign, delegate
or otherwise transfer any of its rights or obligations under this Agreement
without the consent of each other party hereto.
 
   Section 9.05 Governing Law. This Agreement shall be governed by and
construed in accordance with the law of the State of Delaware, regardless of
the law that might otherwise govern under applicable principles of conflicts of
law.
 
                                      A-41
<PAGE>
 
   Section 9.06 Jurisdiction. Any suit, action or proceeding seeking to enforce
any provision of, or based on any matter arising out of or in connection with,
this Agreement or the transactions contemplated hereby may be brought in any
federal court located in Houston, Harris County, Texas or Ft. Worth, Tarrant
County, Texas, and each of the parties hereby consents to the jurisdiction of
such courts (and of the appropriate appellate courts therefrom) in any such
suit, action or proceeding and irrevocably waives, to the fullest extent
permitted by law, any objection which it may now or hereafter have to the
laying of the venue of any such suit, action or proceeding in any such court or
that any such suit, action or proceeding which is brought in any such court has
been brought in an inconvenient form. Process in any such suit, action or
proceeding may be served on any party anywhere in the world, whether within or
without the jurisdiction of any such court. Without limiting the foregoing,
each party agrees that service of process on such party as provided in Section
9.01 shall be deemed effective service of process on such party.
 
   Section 9.07 Waiver of Jury Trial. EACH OF THE PARTIES HERETO HEREBY
IRREVOCABLY WAIVES ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING
ARISING OUT OF OR RELATED TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED
HEREBY.
 
   Section 9.08 Attorneys' Fees. If any action at law or equity, including,
without limitation, an action for declaratory relief, is brought to enforce or
interpret any provision of this Agreement, the prevailing party shall be
entitled to recover reasonable attorneys' fees and expenses from the other
party, which fees and expenses shall be in addition to any other relief which
may be awarded.
 
   Section 9.09 No Third Party Beneficiaries. Except as provided in Section
6.03, 6.08(b), 6.08(c) and 6.12(c), no person or entity other than the parties
hereto is an intended beneficiary of this Agreement or any portion thereof.
 
   Section 9.10 Disclosure Schedule. The disclosures made on any disclosure
schedule, including, without limitation, the SOCO Schedule and the Santa Fe
Schedule, with respect to any representation or warranty shall be deemed to be
made with respect to any other representation or warranty requiring the same or
similar disclosure to the extent that the relevance of such disclosure to other
representations or warranties is evident from the face of the disclosure
schedule. The inclusion of any matter on any disclosure schedule will not be
deemed an admission by any party that such listed matter is material or that
such listed matter has or would have a SOCO Material Adverse Effect or a Santa
Fe Material Adverse Effect, as applicable.
 
   Section 9.11 Counterparts; Effectiveness. This Agreement may be signed in
any number of counterparts, each of which shall be an original, with the same
effect as if the signatures thereto and hereto were upon the same instrument.
This Agreement shall become effective when each party hereto shall have
received counterparts hereof signed by all of the other parties hereto.
 
   Section 9.12 Entire Agreement. This Agreement and the Confidentiality
Agreement constitute the entire agreement between the parties with respect to
the subject matter of this Agreement and supersedes all prior agreements and
understandings, both oral and written, between the parties with respect to the
subject matter hereof and thereof.
 
   Section 9.13 Captions. The captions herein are included for convenience of
reference only and shall be ignored in the construction or interpretation
hereof.
 
   Section 9.14 Severability. If any term, provision, covenant or restriction
of this Agreement is held by a court of competent jurisdiction or other
authority to be invalid, void or unenforceable, the remainder of the terms,
provisions, covenants and restrictions of this Agreement shall remain in full
force and effect and shall in no way be affected, impaired or invalidated so
long as the economic or legal substance of the transactions contemplated hereby
is not affected in any manner materially adverse to any party. Upon such a
holding of invalidity, voidness or unenforceability, the parties shall
negotiate in good faith to modify this Agreement so as to effect the original
intent of the parties as closely as possible in an acceptable manner in order
that the transactions contemplated hereby be consummated as originally
contemplated to the fullest extent possible.
 
                                      A-42
<PAGE>
 
   Section 9.15 Definitions and Usage. (a) For purposes of this Agreement:
 
   "affiliate" means, with respect to any person, any other person directly or
indirectly controlling, controlled by, or under common control with such
person.
 
   "knowledge" of any person which is not an individual means the knowledge of
such person's officers after reasonable inquiry.
 
   "officer" means in the case of Santa Fe and SOCO, any executive officer of
Santa Fe or SOCO, as applicable, within the meaning of Rule 3b-7 of the 1934
Act.
 
   "person" means an individual, corporation, partnership, limited liability
company, association, estate, trust or other entity or organization, including,
without limitation, a government or political subdivision or an agency or
instrumentality thereof.
 
   "subsidiary" means, with respect to any person, any entity of which (i)
securities or other ownership interests having ordinary voting power to elect a
majority of the board of directors or other persons performing similar
functions are at any time directly or indirectly owned by such person or (ii)
such party or any subsidiary of such party is a general partner of a
partnership or a manager of a limited liability company.
 
   "tax" means any income tax or similar assessment or any sales, excise,
occupation, use, ad valorem, property, production, severance, transportation,
employment, payroll, franchise, or other tax imposed by any United States
federal, state or local (or any foreign or provincial) taxing authority,
including, without limitation, any interest, penalties or additions
attributable thereto.
 
   "Treasury Regulations" means one or more treasury regulations promulgated
under the Code by the Treasury Department of the United States.
 
   "WARN Act" means the Federal Worker Adjustment and Retraining Notification
Act of 1988.
 
   A reference in this Agreement to any statute shall be to such statute as
amended from time to time, and to the rules and regulations promulgated
thereunder.
 
   (b) Each of the following terms is defined in the Section set forth
 
<TABLE>
      <S>                                                               <C>
      1933 Act.........................................................     3.03
      1934 Act.........................................................     3.03
      368 Reorganization...............................................     1.02
      Certificate of Merger............................................  1.01(b)
      Charter..........................................................     2.01
      Closing..........................................................     1.10
      Closing Date.....................................................     1.10
      Code............................................................. Recitals
      Confidentiality Agreement........................................     6.01
      Customary Post Closing Consents..................................     3.03
      DGCL.............................................................  1.01(a)
      D&O Insurance....................................................  6.03(b)
      Distribution Date................................................     3.05
      Effective Time...................................................  1.01(b)
      Environmental Laws...............................................  3.16(c)
      Environmental Permits............................................  3.16(c)
      ERISA............................................................  3.15(a)
      Excess Shares....................................................     1.07
      Exchange Agent...................................................  1.05(a)
      Exchange Ratio...................................................  1.04(a)
</TABLE>
 
                                      A-43
<PAGE>
 
<TABLE>
      <S>                                                            <C>
      Expenses......................................................     6.04(b)
      GAAP..........................................................        3.08
      HSR Act.......................................................        3.03
      Hazardous Substances.......................................... 3.16(a)(ii)
      Hydrocarbons..................................................     3.20(d)
      Indemnified Party.............................................     6.03(a)
      International.................................................        3.06
      Leases........................................................     3.20(d)
      Lien..........................................................        3.04
      Merger........................................................    Recitals
      Merger Consideration..........................................     1.04(a)
      NYSE..........................................................        1.07
      Oil and Gas Contracts.........................................     3.20(d)
      Oil and Gas Interests.........................................     3.20(d)
      Permits.......................................................        3.11
      Proxy Statement/Prospectus....................................     6.10(b)
      Registration Statement........................................     6.10(b)
      Santa Fe Acquisition Proposal.................................     6.02(a)
      Santa Fe Agreement............................................     6.12(c)
      Santa Fe Balance Sheet........................................        4.08
      Santa Fe Balance Sheet Date...................................        4.08
      Santa Fe Breach...............................................     8.01(c)
      Santa Fe Common Stock.........................................     1.04(a)
      Santa Fe Employee Plans.......................................     4.15(a)
      Santa Fe Intellectual Property Rights.........................        4.19
      Santa Fe Material Adverse Effect..............................     4.06(a)
      Santa Fe Plan.................................................        4.05
      Santa Fe Preferred Stock......................................        4.05
      Santa Fe Reserve Report.......................................        4.21
      Santa Fe Returns..............................................        4.14
      Santa Fe Schedule.............................................  Article IV
      Santa Fe SEC Filings..........................................     4.07(a)
      Santa Fe Special Meeting......................................     6.09(b)
      Santa Fe Stockholders' Approval...............................        4.23
      Santa Fe Stock Options........................................     1.06(a)
      Santa Fe Termination Fee......................................     6.04(d)
      SEC...........................................................     3.07(a)
      SOCO Acquisition Proposal.....................................     6.02(b)
      SOCO Agreement................................................     6.12(c)
      SOCO Balance Sheet............................................        3.08
      SOCO Balance Sheet Date.......................................        3.08
      SOCO Breach...................................................     8.01(d)
      SOCO Common Stock.............................................     1.04(a)
      SOCO Director Nominees........................................     6.08(a)
      SOCO Employee Plans...........................................     3.15(a)
      SOCO Intellectual Property Rights.............................        3.19
      SOCO Material Adverse Effect..................................     3.06(a)
      SOCO Plan.....................................................        3.05
      SOCO Preferred Stock..........................................        3.05
      SOCO Reserve Report...........................................        3.21
      SOCO Returns..................................................        3.14
</TABLE>
 
                                      A-44
<PAGE>
 
<TABLE>
      <S>                                                            <C>
      SOCO Schedule................................................. Article III
      SOCO SEC Filings..............................................     3.07(a)
      SOCO Special Meeting..........................................     6.09(a)
      SOCO Stock Certificate........................................     1.04(a)
      SOCO Stock Options............................................     1.06(a)
      SOCO Stockholders' Approval...................................        3.23
      SOCO Termination Fee..........................................     6.04(c)
      Superior Santa Fe Acquisition Proposal........................     6.02(a)
      Superior SOCO Acquisition Proposal............................     6.02(b)
      Surviving Corporation.........................................     1.01(a)
</TABLE>
 
   IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be duly
executed by their respective authorized officers as of the day and year first
above written.
 
                                          SANTA FE ENERGY RESOURCES, INC.
 
                                          /s/ JAMES L. PAYNE
                                          -------------------------------------
                                          James L. Payne
                                          Chairman of the Board and Chief
                                           Executive Officer
 
                                          SNYDER OIL CORPORATION
 
                                          /s/ JOHN C. SNYDER
                                          -------------------------------------
                                          John C. Snyder
                                          Chairman of the Board and Chief
                                           Executive Officer
 
                                      A-45
<PAGE>
 
                                                                       EXHIBIT A
 
                                MERGER AGREEMENT
                                AFFILIATE LETTER
 
                                        , 1999
 
TO:
Santa Fe
SOCO
 
Ladies and Gentlemen:
 
   The undersigned has been advised that as of the date of this letter the
undersigned may be deemed to be an "affiliate" of       , Inc., a Delaware
corporation ("Company"), as the term "affiliate" is defined for purposes of
paragraphs (c) and (d) of Rule 145 of the rules and regulations (the "Rules and
Regulations") of the Securities and Exchange Commission (the "Commission")
under the Securities Act of 1933, as amended (the "Act"). Pursuant to the terms
of the Agreement and Plan of Merger dated as of January   , 1999 (the
"Agreement") between Company and      Inc., a Delaware corporation ("Parent"),
Company will be merged with and into Parent with Parent to be the surviving
corporation in the merger (the "Merger").
 
   As a result of the Merger, the undersigned will receive shares of Common
Stock, par value $0.01 per share, of Parent (the "Parent Common Stock") in
exchange for shares of Common Stock, par value $0.01 per share, of Company (the
"Company Common Stock") owned by the undersigned immediately prior to the time
of the effectiveness of the Merger.
 
   The undersigned represents, warrants and covenants to Parent and Company
that as of the date the undersigned receives any Parent Common Stock as a
result of the Merger:
 
     A. The undersigned shall not make any sale, transfer or other
  disposition of the Parent Common Stock in violation of the Act or the Rules
  and Regulations.
 
     B. The undersigned has carefully read this letter and discussed the
  requirements of this letter and other applicable limitations upon the
  undersigned's ability to sell, transfer or otherwise dispose of the Parent
  Common Stock to the extent the undersigned felt necessary with the
  undersigned's counsel or counsel for Company.
 
     C. The undersigned has been advised that the issuance of Parent Common
  Stock to the undersigned pursuant to the Merger will be registered with the
  Commission under the Act on a Registration Statement on Form S-4. However,
  the undersigned has also been advised that, since at the time the Merger is
  submitted for a vote of the stockholders of Company, the undersigned may be
  deemed to be an affiliate of Company, the undersigned may not sell,
  transfer or otherwise dispose of the Parent Common Stock issued to the
  undersigned in the Merger unless (i) such sale, transfer or other
  disposition has been registered under the Act, (ii) such sale, transfer or
  other disposition is made in conformity with Rule 145 promulgated by the
  Commission under the Act, or (iii) in the opinion of counsel reasonably
  acceptable to Parent, or pursuant to a "no action" letter obtained by the
  undersigned from the staff of the Commission, such sale, transfer or other
  disposition is otherwise exempt from registration under the Act; provided,
  however, that, for so long as the undersigned holds any Parent Common Stock
  which is subject to the limitations of Rule 145, Parent will use its
  reasonable efforts to file all reports required to be filed by it pursuant
  to the Securities Exchange Act of 1934, as amended, and the Rules and
  Regulations thereunder, as the same shall be in effect at the time, so as
  to satisfy the requirements of paragraph (c) of Rule 144 under the Act that
  there be available current public information with respect to Parent, and
  to that extent to make available to the undersigned the exemption afforded
  by Rule 145 with respect to the sale, transfer or other disposition of the
  Parent Common Stock.
<PAGE>
 
     D. The undersigned understands that Parent is under no obligation to
  register the sale, transfer or other disposition of the Parent Common Stock
  by the undersigned or on the undersigned's behalf under the Act.
 
     E. The undersigned further understands and agrees that the
  representations, warranties, covenants and agreements of the undersigned
  set forth herein are for the benefit of Parent, Company and the Surviving
  Corporation (as defined in the Merger Agreement) and will be relied upon by
  such entities and their respective counsel and accountants.
 
     F. The undersigned understands and agrees that this letter agreement
  shall apply to all shares of the capital stock of Parent and Company that
  are deemed to be beneficially owned by the undersigned pursuant to
  applicable federal securities laws.
 
   The undersigned acknowledges and agrees that appropriate restrictive legends
will be placed on certificates representing Parent Common Stock received by the
undersigned in the Merger or held by a transferee thereof and that "stop
transfer" orders may be entered in the records of the transfer agent for
Parent's Common Stock. Such orders will be removed and such legends will be
removed by delivery of substitute certificates upon receipt of an opinion in
form and substance reasonably satisfactory to Parent from independent counsel
reasonably satisfactory to Parent to the effect that such legends are no longer
required to assure compliance with applicable provisions of the Act.
Notwithstanding the foregoing, any such legends will be removed by delivery of
substitute certificates upon written request of the undersigned if at the time
of making such request the undersigned, in the opinion of independent counsel
reasonably satisfactory to Parent, would otherwise be permitted to dispose of
the Parent Common Stock represented by such certificates pursuant to Rule
145(d)(2).
 
   Execution of this letter should not be considered an admission on the part
of the undersigned that the undersigned is an "affiliate" of Company as
described in the first paragraph of this letter or as a waiver of any rights
the undersigned may have to object to any claim that the undersigned is such an
affiliate on or after the date of this letter.
 
                                          Very truly yours,
 
                                          By: _________________________________
                                          Name: _______________________________
                                          Title: ______________________________
 
Agreed and accepted this      day
of                  , 1999.
 
PARENT
 
By: ___________________________
Name: _________________________
Title: ________________________
 
                                  Exhibit A-2
<PAGE>
 
                                                                 EXHIBIT 6.08(b)
 
                  EXECUTIVE OFFICERS OF SURVIVING CORPORATION
 
<TABLE>
 <C>                <S>
 James L. Payne     Chief Executive Officer
 Hugh L. Boyt       President--International
 William G. Hargett President--North America
 Duane C. Radke     Executive Vice President--Production
 Tim S. Parker      Executive Vice President--Exploration
 Mark A. Jackson    Executive Vice President and Chief Financial Officer
 Janet F. Clark     Executive Vice President--Corporate Development and
                     Administration
 David L. Hicks     Vice President and General Counsel
</TABLE>
<PAGE>
 
                                                                         ANNEX B
 
        [DONALDSON, LUFKIN & JENRETTE SECURITIES CORPORATION LETTERHEAD]
 
                                          January 13, 1999
 
Board of Directors
Santa Fe Energy Resources, Inc.
1616 South Voss, Suite 1000
Houston, TX 77057
 
Dear Sirs:
 
   You have requested our opinion as to the fairness from a financial point of
view to Santa Fe Energy Resources, Inc. (the "Company") and its stockholders of
the consideration to be paid by the Company pursuant to the terms of the
Agreement and Plan of Merger, dated as of January 13, 1999 (the "Agreement"),
by and between Snyder Oil Corporation ("Snyder") and the Company pursuant to
which Snyder will be merged (the "Merger") with and into Santa Fe Energy
Resources, Inc.
 
   Pursuant to the Agreement, each share of common stock, par value $0.01 per
share, of Snyder ("Snyder Common Stock") will be converted, subject to certain
exceptions, into the right to receive 2.05 shares (the "Exchange Ratio") of
common stock, par value $0.01 per share, of the Company ("Santa Fe Common
Stock").
 
   In arriving at our opinion, we reviewed the Agreement. We also reviewed
certain publicly available business and financial information relating to the
Company and Snyder and certain business and financial information, including
certain information as to future financial results, relating to the Company and
Snyder, prepared by the respective managements based on, among other things,
certain estimates of proved and non-proved reserves, projected annual
production of such reserves in certain domestic and international areas and
amounts and timing of the cost savings and operating synergies expected to
result from a combination of the business of the Company and Snyder. We
discussed the historical operating and financial data and performance of the
Company and Snyder with management and operating personnel of each company and
discussed operating and other information prepared by the respective
managements of the Company and Snyder with management and operating personnel
of the Company and Snyder as well as their views of the business, operating and
strategic benefits of the merger, including the amount and timing of cost
savings and operating synergies expected to result from the merger. In
addition, we compared certain financial, operating and securities data of the
Company and Snyder with various other companies that we deemed relevant;
reviewed the historical stock prices and trading volumes of Santa Fe Common
Stock and Snyder Common Stock; compared financial terms of the merger with the
financial terms of certain other transactions that we deemed relevant; and
conducted such other financial studies, analyses and investigations as we
deemed necessary and appropriate for purposes of its opinion.
 
   In rendering our opinion, we relied upon and assumed the accuracy and
completeness of all the financial and other information that was available to
it from public sources and that was provided to us by the Company and Snyder or
their respective representatives. In particular, we relied upon estimates of
the managements of the Company and Snyder of operating synergies achievable as
a result of the merger and its discussion of such synergies with the
managements of the Company and Snyder. With respect to the non-historical
financial information supplied by us, we assumed that such information was
reasonably prepared on the basis reflecting the best currently available
estimates and judgments of the managements of the Company and Snyder as to the
future operating and financial performance of each company, respectively. We
did not assume any responsibility for making any independent evaluation of the
Company's and Snyder's assets or liabilities or for making any independent
verification of any of the information reviewed by us.
<PAGE>
 
   In addition, we assumed, in all respects material to our analysis, that the
representations and warranties of each party contained in the merger agreement
were true and correct, that each party will perform all of the covenants and
agreements required to be performed by it under the merger agreement and that
all conditions to the consummation of the merger will be satisfied without
waiver thereof. We also assumed that all material governmental, regulatory or
other consents and approvals will be obtained and that, in the course of
obtaining any necessary governmental, regulatory or other consents and
approvals, or any amendments, modifications, or waivers to any documents to
which either the Company or Snyder is a party, no restrictions will be imposed
or amendments, modifications or waivers made that would have any material
adverse effect on the contemplated benefits to the Company and Snyder of the
merger. In addition, we assumed that the merger will qualify as a tax-free
reorganization for U.S. federal income tax purposes.
 
   Our opinion is necessarily based on economic, market, financial and other
conditions as they exist on, and on the information made available to us as of,
the date of this letter. It should be understood that, although subsequent
developments may affect this opinion, we do not have any obligation to update,
revise or reaffirm this opinion. We are expressing no opinion herein as to the
prices at which Santa Fe Common Stock will actually trade at any time. Our
opinion does not address the relative merits of the Merger and the other
business strategies being considered by the Company's Board of Directors, nor
does it address the Board's decision to proceed with the Merger. Our opinion
does not constitute a recommendation to any stockholder as to how such
stockholder should vote on the proposed transaction.
 
   Donaldson, Lufkin & Jenrette Securities Corporation ("DLJ"), as part of its
investment banking services, is regularly engaged in the valuation of
businesses and securities in connection with mergers, acquisitions,
underwritings, sales and distributions of listed and unlisted securities,
private placements and valuations for corporate and other purposes. DLJ has
performed investment banking and other services for the Company in the past and
has been compensated for such services.
 
   Based upon and subject to the foregoing and such other factors as we deem
relevant, we are of the opinion that the Exchange Ratio is fair to the Company
and holders of Santa Fe Common Stock from a financial point of view.
 
                                          Very truly yours,
 
                                          DONALDSON, LUFKIN & JENRETTE
                                          SECURITIES CORPORATION
 
                                          By: /s/ Ralph Eads
                                          -------------------------------------
                                          Ralph Eads
                                          Managing Director
 
                                   Annex B-2
<PAGE>
 
                                                                         ANNEX C
 
                       [CHASE SECURITIES INC. LETTERHEAD]
 
Chase Securities Inc.
600 Travis Street, 20th Floor
Houston, Texas 77002
 
                                          January 13, 1999
 
Board of Directors
Santa Fe Energy Resources, Inc.
1616 South Voss, Suite 1000
Houston, Texas 77057
 
Members of the Board:
 
   You have informed us that Santa Fe Energy Resources, Inc. ("Santa Fe
Energy") and Snyder Oil Corporation ("Snyder Oil") propose to enter into an
Agreement and Plan of Merger, dated as of January 13, 1999 (the "Merger
Agreement"), which provides, among other things, for the merger (the "Merger")
of Snyder Oil with and into Santa Fe Energy pursuant to a transaction in which
each outstanding share of the common stock, par value $0.01 per share, of
Snyder Oil, including the associated preferred stock purchase rights (the
"Snyder Oil Shares") will be converted into the right to receive 2.05 shares
(the "Exchange Ratio") of common stock, par value $0.01 per share, of Santa Fe
Energy, including the associated preferred stock purchase rights (the "Santa Fe
Energy Shares").
 
   You have requested that we render our opinion as to the fairness, from a
financial point of view, to the holders of Santa Fe Energy Shares (other than
Snyder Oil and its affiliates) of the Exchange Ratio in the Merger.
 
   In arriving at the opinion set forth below, we have, among other things:
 
     (a) reviewed a draft of the Merger Agreement in the form provided to us
  and have assumed that the final form of the Merger Agreement will not vary
  in any regard that is material to our analysis;
 
     (b) reviewed certain publicly available business and financial
  information that we deemed relevant relating to Snyder Oil and Santa Fe
  Energy and the industries in which they operate;
 
     (c) reviewed certain internal non-public financial and operating data
  provided to us by or on behalf of the managements of Snyder Oil and Santa
  Fe Energy relating to such businesses, including certain forecast and
  projection information as to the future financial results of such
  businesses, as well as the amount and timing of the cost savings and the
  related expenses and synergies expected to result from the Merger (the
  "Expected Synergies");
 
     (d) discussed with members of the senior management and representatives
  of Snyder Oil and Santa Fe Energy, the operations, historical financial
  statements and future prospects (before and after giving effect to the
  Merger) of Snyder Oil and Santa Fe Energy, as well as their views of the
  business, operational and strategic benefits and other implications of the
  Merger, including the Expected Synergies and such other matters as we
  deemed necessary or appropriate;
 
     (e) compared the financial and operating performance of Snyder Oil and
  Santa Fe Energy with publicly available information concerning certain
  other companies we deemed relevant and reviewed the relevant historical
  stock prices and trading volumes of the Snyder Oil Shares, the Santa Fe
  Energy Shares and certain publicly traded securities of such other
  companies;
 
     (f) reviewed the financial terms of certain recent business combinations
  and acquisition transactions we deemed relevant to the Merger and otherwise
  relevant to our inquiry; and
 
     (g) made such other analyses and examinations as we have deemed
  necessary or appropriate.
<PAGE>
 
   We have assumed and relied upon, without assuming any responsibility for
verification, the accuracy and completeness of all of the financial and other
information provided to, discussed with, or reviewed by or for us, or publicly
available, for purposes of this opinion, and have further relied upon the
assurances of management of Snyder Oil and Santa Fe Energy that they are not
aware of any facts that would make such information inaccurate or misleading.
We have neither made nor obtained any independent evaluations or appraisals of
the reserves or other assets or liabilities of Snyder Oil or Santa Fe Energy,
nor have we conducted a physical inspection of the properties and facilities of
Snyder Oil or Santa Fe Energy. With respect to the oil and natural gas reserves
of Santa Fe Energy and Snyder Oil, we have relied upon and assumed the accuracy
of the reserve information provided to us by management of Santa Fe Energy and
Snyder Oil. We have assumed that the financial forecast and projection
information and the Expected Synergies provided to or discussed with us by or
on behalf of Snyder Oil and/or Santa Fe Energy have been reasonably determined
on bases reflecting the best currently available estimates and judgements of
the managements of Snyder Oil and Santa Fe Energy as to the future financial
performance of Snyder Oil and Santa Fe Energy, as the case may be, and the
Expected Synergies. We have further assumed that, in all material respects,
such forecasts, projections and Expected Synergies will be realized in the
amounts and times indicated thereby. We express no view as to such forecast or
projection information or the assumptions on which they were based.
 
   We have not been asked to consider, and this opinion does not in any manner
address, the prices at which the Santa Fe Energy Shares or Snyder Oil Shares
will actually trade following the announcement or consummation of the Merger.
In addition, we were not requested to, and did not, solicit offers from third
parties to acquire all or part of Santa Fe Energy.
 
   For purposes of rendering our opinion, we have assumed, in all respects
material to our analysis, that the representations and warranties of each party
contained in the Merger Agreement are true and correct, that each party will
perform all of the covenants and agreements required to be performed by it
under the Merger Agreement and that all conditions to the consummation of the
Merger will be satisfied without waiver thereof. We have also assumed that all
material governmental, regulatory or other consents and approvals will be
obtained and that in the course of obtaining any necessary governmental,
regulatory or other consents and approvals, or any amendments, modifications or
waivers to any documents to which either of Snyder Oil or Santa Fe Energy are
party, as contemplated by the Merger Agreement, no restrictions will be imposed
or amendments, modifications or waivers made that would have any material
adverse effect on the contemplated benefits to Snyder Oil and Santa Fe Energy
of the Merger. We have further assumed that the Merger will qualify as a tax-
free reorganization for U.S. federal income tax purposes.
 
   Our opinion herein is necessarily based on market, economic and other
conditions as they exist and can be evaluated on the date of this letter. Our
opinion is limited to the fairness, from a financial point of view, to the
holders of Santa Fe Energy Shares (other than Snyder Oil and its affiliates) of
the Exchange Ratio in the Merger and we express no opinion as to the merits of
the underlying decision by Santa Fe Energy to engage in the Merger. This
opinion does not constitute a recommendation to any holder of Santa Fe Energy
Shares as to how such holder of Santa Fe Energy Shares should vote with respect
to the Merger or any matter related thereto.
 
   Chase Securities Inc., as part of its financial advisory business, is
continually engaged in the valuation of businesses and their securities in
connection with mergers and acquisitions and valuations for estate, corporate
and other purposes. We have acted as financial advisor to Santa Fe Energy in
connection with the Merger and will receive a fee for our services, including
for rendering this opinion. Our fee that is not payable for rendering this
opinion is contingent on the consummation of the Merger or the termination of
the Merger Agreement under circumstances where Santa Fe Energy is entitled to
the payment of a fee pursuant to Section 6.04(c) of the Merger Agreement. In
addition, Santa Fe Energy has agreed to indemnify us for certain liabilities
arising out of our engagement. As we have previously advised you, The Chase
Manhattan Corporation and its affiliates, including Chase Securities Inc., in
the ordinary course of business, have, from time to time, provided, and in the
future may continue to provide, commercial and/or investment banking services
to Santa Fe Energy and Snyder Oil, including serving as agent bank under Santa
Fe Energy's senior credit facility. In the ordinary
 
                                   Annex C-2
<PAGE>
 
course of business, we or our affiliates may trade in the debt and equity
securities of Santa Fe Energy and Snyder Oil for our own accounts and for the
accounts of our customers and, accordingly, may at any time hold a long or
short position in such securities.
 
   Based upon and subject to the foregoing, we are of the opinion, as of the
date hereof, that the Exchange Ratio in the Merger is fair, from a financial
point of view, to the holders of Santa Fe Energy Shares (other than Snyder Oil
and its affiliates).
 
   This opinion is for the use and benefit of the Board of Directors of Santa
Fe Energy in its evaluation of the Merger and shall not be used for any other
purpose without the prior written consent of Chase Securities Inc.
 
                                          Very truly yours,
 
                                          /s/ Chase Securities Inc.
                                          -------------------------------------
                                          CHASE SECURITIES INC.
 
                                   Annex C-3
<PAGE>
 
                                                                         ANNEX D
 
                    [PETRIE PARKMAN & CO., INC. LETTERHEAD]
 
                                January 13, 1999
 
The Board of Directors
Snyder Oil Corporation
777 Main Street
Fort Worth, TX 76102
 
Members of the Board:
 
   Santa Fe Energy Resources, Inc., a Delaware corporation ("Santa Fe"), and
Snyder Oil Corporation, a Delaware corporation ("Snyder"), propose to enter
into an agreement and plan of merger, dated as of January 13, 1999 (the "Merger
Agreement"), which provides for, among other things, the merger (the "Merger")
of Snyder with and into Santa Fe. Upon consummation of the Merger, each share
of common stock, par value $0.01 per share, including all of the associated
preferred stock purchase rights (the "Snyder Common Stock"), of Snyder issued
and outstanding immediately prior thereto (other than Snyder Common Stock held
by Snyder as treasury stock or owned by Santa Fe or any of its subsidiaries)
will be converted into the right to receive 2.05 shares (the "Exchange Ratio")
of common stock, par value $0.01 per share (the "Santa Fe Common Stock"), of
Santa Fe.
 
   You have requested our opinion as to whether the Exchange Ratio is fair from
a financial point of view to the holders of Snyder Common Stock.
 
   In arriving at our opinion, we have, among other things:
 
  1. reviewed certain publicly available business and financial information
     relating to Snyder and Santa Fe, including (a) the Annual Reports on
     Form 10-K and related audited financial statements for the fiscal year
     ended December 31, 1997, (b) the unaudited financial statements for the
     fiscal quarters ended March 31, 1998, June 30, 1998, and September 30,
     1998, (c) the unaudited financial statements of Snyder for the year to
     date period ended October 31, 1998, which includes an income statement
     for the month of October 1998, prepared by the management of Snyder, (d)
     a projection dated December 14, 1998 of the balance sheet of Snyder as
     of December 31, 1998 and the related income statement for the year ended
     December 31, 1998, prepared by the management of Snyder, (e) a
     projection dated December 16, 1998 of the balance sheet of Santa Fe as
     of December 31, 1998, prepared by the management of Santa Fe, and (f) a
     projection dated December 16, 1998 of the income statement for the
     fiscal quarter ended December 31, 1998, prepared by the management of
     Santa Fe;
 
  2. reviewed certain estimates of Snyder's reserves, including (a) estimates
     of proved oil and gas reserves prepared by Netherland, Sewell &
     Associates, Inc. as of December 31, 1997, (b) unaudited proved,
     probable, possible and other oil and gas reserves prepared by the
     management and staff of Snyder as of June 30, 1998, and (c) preliminary
     estimates of proved, probable, possible and other oil and gas reserves
     prepared by the management and staff of Snyder as of December 31, 1998;
 
  3. reviewed certain estimates of Santa Fe's reserves, including (a)
     preliminary estimates of proved, probable and possible oil and gas
     reserves of Santa Fe in the United States offshore Gulf of Mexico,
     onshore United States Gulf Coast, and Argentina prepared by Ryder Scott
     Petroleum Engineers as of January 1, 1999, (b) preliminary estimates of
     proved, probable and possible oil and gas reserves of Santa Fe in the
     Jabung field in Indonesia prepared by DeGolyer and MacNaughton as of
     October 31, 1998, and (c) preliminary estimates of proved, probable,
     possible and other oil and gas reserves of Santa Fe prepared by the
     management and staff of Santa Fe as of January 1, 1999;
<PAGE>
 
  4. analyzed certain historical and projected financial and operating data
     of Snyder and Santa Fe prepared by the management of Snyder and Santa
     Fe, respectively;
 
  5. discussed the current and projected operations and prospects of Snyder
     and Santa Fe with the management and operating staff of Snyder and Santa
     Fe, respectively;
 
 
  6. reviewed the historical trading history of the Snyder Common Stock and
     the Santa Fe Common Stock;
 
  7. compared recent stock market capitalization indicators for Snyder and
     Santa Fe with the recent stock market capitalization indicators for
     certain other publicly traded independent energy companies;
 
  8. compared the financial terms of the Merger with the financial terms of
     certain other transactions that we deemed to be relevant;
 
  9. reviewed a draft dated January 13, 1999 of the Merger Agreement; and
 
  10. reviewed such other financial studies and analyses and performed such
      other investigations and took into account such other matters as we
      have deemed necessary or appropriate.
 
   In preparing our opinion, we have assumed and relied upon, without assuming
any responsibility for verification, the accuracy and completeness of any
information supplied or otherwise made available to us by Snyder and Santa Fe.
We have further relied upon the assurances of the management of Snyder and
Santa Fe that they are unaware of any facts that would make the information
provided to us incomplete or misleading in any material respect. With respect
to projected financial and operating data, we have assumed that they have been
reasonably prepared on bases reflecting the best currently available estimates
and judgment of the management of Snyder and Santa Fe, respectively, relating
to the future financial and operational performance of Snyder and Santa Fe.
With respect to the estimates of oil and gas reserves, we have assumed that
they have been reasonably prepared on bases reflecting the best available
estimates and judgments of Snyder and Santa Fe or their respective engineering
consultants relating to the oil and gas properties of Snyder and Santa Fe,
respectively. We have not made an independent evaluation or appraisal of the
assets or liabilities of Snyder or Santa Fe nor, except for the estimates of
oil and gas reserves referred to above, have we been furnished with such an
evaluation or appraisal. Consistent with the Merger Agreement, we have assumed
that the Merger will be treated for federal income tax purposes as a
reorganization within the meaning of Section 368(a) of the Internal Revenue
Code of 1986, as amended.
 
   Our opinion relates solely to the fairness, from a financial point of view,
of the Exchange Ratio. This opinion is for the use and benefit of the Board of
Directors of Snyder and does not constitute a recommendation to any stockholder
as to how such stockholder should vote on the Merger. We have not been asked to
consider, and this opinion does not address, the after-tax consequences of the
Merger to any particular stockholder of Snyder or the price at which the Santa
Fe Common Stock will actually trade following the announcement or consummation
of the Merger. As you are aware, we have acted as financial advisor to Snyder
and we will receive a fee from Snyder, a substantial portion of which is
contingent upon the consummation of the Merger. We have also, in the past,
provided financial advisory services to Santa Fe and Snyder and have received
customary fees for such services.
 
   Our opinion is rendered on the basis of conditions in the securities markets
and the oil and gas markets prevailing as of the date hereof and the condition
and prospects, financial and otherwise, of Snyder and Santa Fe as they have
been represented to us as of the date hereof or as they were reflected in the
materials and discussions described above.
 
   Based upon and subject to the foregoing, it is our opinion that, as of the
date hereof, the Exchange Ratio is fair from a financial point of view to the
holders of Snyder Common Stock.
 
                                        Very truly yours,
 
                                        PETRIE PARKMAN & CO., INC.
<PAGE>
 
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
   All capitalized terms used and not defined in Part II of this registration
statement shall have the meanings assigned to them in the Prospectus which
forms a part of this registration statement.
 
Item 20. Indemnification of Directors and Officers.
 
   Subsection (a) of Section 145 of the General Corporation Law of the State of
Delaware empowers a corporation to indemnify any person who was or is a party
or is threatened to be made a party to any threatened, pending or completed
action, suit or proceeding, whether civil, criminal, administrative or
investigative (other than an action by or in the right of the corporation) by
reason of the fact that he is or was a director, officer, employee or agent of
the corporation, or is or was serving at the request of the corporation as a
director, officer, employee or agent of another corporation, partnership, joint
venture, trust or other enterprise, against expenses (including attorneys'
fees), judgments, fines and amounts paid in settlement actually and reasonably
incurred by him in connection with such action, suit or proceeding if he acted
in good faith and in a manner he reasonably believed to be in or not opposed to
the best interests of the corporation, and, with respect to any criminal action
or proceeding, had no reasonable cause to believe his conduct was unlawful.
 
   Subsection (b) of Section 145 empowers a corporation to indemnify any person
who was or is a party or is threatened to be made a party to any threatened,
pending or completed action or suit by or in the right of the corporation to
procure a judgment in its favor by reason of the fact that such person acted in
any of the capacities set forth above, against expenses (including attorneys'
fees) actually and reasonably incurred by him in connection with the defense or
settlement of such action or suit if he acted in good faith and in a manner he
reasonably believed to be in or not opposed to the best interests of the
corporation, except that no indemnification may be made in respect of any
claim, issue or matter as to which such person shall have been adjudged to be
liable to the corporation unless and only to the extent that the Court of
Chancery or the court in which such action or suit was brought shall determine
upon application that, despite the adjudication of liability but in view of all
the circumstances of the case, such person is fairly and reasonably entitled to
indemnity for such expenses which the Court of Chancery or such other court
shall deem proper.
 
   Section 145 further provides that to the extent a director or officer of a
corporation has been successful on the merits or otherwise in the defense of
any action, suit or proceeding referred to in subsections (a) and (b) of
Section 145 or in the defense of any claim, issue or matter therein, he shall
be indemnified against expenses (including attorneys' fees) actually and
reasonably incurred by him in connection therewith; that indemnification
provided for by Section 145 shall not be deemed exclusive of any other rights
to which the indemnified party may be entitled; that indemnification provided
by Section 145 shall, unless otherwise provided when authorized or ratified,
continue as to a person who has ceased to be a director, officer, employee or
agent and shall inure to the benefit of such person's heirs, executors and
administrators; and empowers the corporation to purchase and maintain insurance
on behalf of a director or officer of the corporation against any liability
asserted against him and incurred by him in any such capacity, or arising out
of his status as such, whether or not the corporation would have the power to
indemnify him against such liabilities under Section 145.
 
   Section 102(b)(7) of the General Corporation Law of the State of Delaware
provides that a certificate of incorporation may contain a provision
eliminating or limiting the personal liability of a director to the corporation
or its stockholders for monetary damages for breach of fiduciary duty as a
director, provided that such provision shall not eliminate or limit the
liability of a director (i) for any breach of the director's duty of loyalty to
the corporation or its stockholders, (ii) for acts or omissions not in good
faith or which involve intentional misconduct or a knowing violation of law,
(iii) under Section 174 of the Delaware General Corporation Law or (iv) for any
transaction from which the director derived an improper personal benefit.
 
                                      II-1
<PAGE>
 
   Article NINTH of Santa Fe's Restated Certificate of Incorporation states
that:
 
   "No director of the Corporation shall be personally liable to the
   Corporation or its stockholders for monetary damages for breach of
   fiduciary duty by such director as a director; provided, however,
   that this Article NINTH shall not eliminate or limit the liability
   of a director to the extent provided by applicable law (i) for any
   breach of the director's duty of loyalty to the Corporation or its
   stockholders, (ii) for acts or omissions not in good faith or which
   involve intentional misconduct or a knowing violation of law, (iii)
   under Section 174 of the General Corporation Law of the State of
   Delaware or (iv) for any transaction from which the director derived
   an improper personal benefit. No amendment to or repeal of this
   Article NINTH shall apply to, or have any effect on, the liability
   or alleged liability of any director of the Corporation for or with
   respect to any facts or omissions of such director occurring prior
   to such amendment or repeal. If the General Corporation Law of the
   State of Delaware is amended to authorize corporate action further
   eliminating or limiting the personal liability of directors, then
   the liability of a director of the Corporation shall be eliminated
   or limited to the fullest extent permitted by the General
   Corporation Law of the State of Delaware, as so amended."
 
   Article VI of Santa Fe's Bylaws further provides that Santa Fe shall
indemnify its officers, directors, employees and agents to the fullest extent
permitted by law. Pursuant to such provision, Santa Fe has entered into
agreements with various of its officers, directors and employees which provide
for indemnification of such persons.
 
   Item 21. List of Exhibits.
 
<TABLE>
<CAPTION>
 Exhibit
 Number  Description
 ------- -----------
 <C>     <S>
 *2.1    Agreement and Plan of Merger, dated as of January 13, 1999 between
         Snyder Oil Corporation and Santa Fe Energy Resources, Inc. (included
         as Annex A to the Joint Proxy Statement/Prospectus).
  4.1    Restated Certificate of Incorporation (incorporated by reference to
         Exhibit 3.1 of the Form S-2 registration statement of Santa Fe Energy
         Resources, Inc. ("Santa Fe") File No. 33-32831).
  4.2    Bylaws, as amended September 1, 1998 (incorporated by reference to
         Exhibit 3(a) to Santa Fe's Quarterly Report on Form 10-Q for the
         period ended September 30, 1998).
  4.3    Rights Agreement dated as of March 3, 1997, between Santa Fe and First
         Chicago Trust of New York, as Rights Agent (incorporated by reference
         to Exhibit 1 to Santa Fe's Form 8-A filed February 28, 1997).
  4.4    Form of Amended Certificate of Designation of Series A Junior
         Participating Preferred Stock of Santa Fe (incorporated by reference
         to Exhibit 1 to Santa Fe's Form 8-A filed February 28, 1997).
  4.5    Form of Indenture dated as of May 25, 1994 and Form of Debenture
         relating to Santa Fe's 11% Senior Subordinated Debentures due 2004
         (incorporated by reference to Exhibit 4.1 of the Form S-3 registration
         statement of Santa Fe File No. 33-52849).
  4.6    First Supplemental Indenture, dated as of October 21, 1996, between
         Santa Fe and State Street Bank and Trust Company, as Trustee, relating
         to Santa Fe's 11% Senior Subordinated Debentures due 2004
         (incorporated by reference to Exhibit 10.1 to Santa Fe's Quarterly
         Report on Form 10-Q for the quarter ended September 30, 1996).
 *5.1    Opinion of Andrews & Kurth L.L.P. regarding legality of the securities
         to be registered.
 *8.1    Opinion of Andrews & Kurth L.L.P. regarding tax matters.
</TABLE>
 
                                      II-2
<PAGE>
 
<TABLE>
<CAPTION>
 Exhibit
 Number  Description
 ------- -----------
 <C>     <S>
  *8.2   Opinion of Vinson & Elkins L.L.P. regarding tax matters.
 *23.1   Consents of Andrews & Kurth L.L.P. (included in the opinions filed as
         Exhibits 5.1 and 8.1 to this registration statement).
 *23.2   Consent of Vinson & Elkins L.L.P. (included in the opinion filed as
         Exhibit 8.2 to this registration statement).
 *23.3   Consent of PricewaterhouseCoopers LLP
 *23.4   Consent of Arthur Andersen LLP
 *23.5   Consent of Ryder Scott Company--Santa Fe
 *23.6   Consent of Netherland, Sewell & Associates, Inc.--Snyder
 *24.1   Powers of Attorney (included in the signature pages of this
         registration statement).
 *99.1   Consent of Donaldson, Lufkin & Jenrette Securities Corporation--
         Santa Fe
 *99.2   Consent of Chase Securities, Inc.--Santa Fe
 *99.3   Consent of Petrie Parkman & Co., Inc.--Snyder
 *99.4   Form of Santa Fe Proxy
 *99.5   Form of Snyder Proxy
</TABLE>
- --------
* Filed herewith
 
Item 22. Undertakings.
 
   Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers and controlling persons of the
registrant pursuant to the provisions described in Item 20 of this
registration statement, or otherwise, the registrant has been advised that in
the opinion of the Securities and Exchange Commission such indemnification is
against public policy as expressed in the Securities Act of 1933 and is,
therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the registrant of expenses
incurred or paid by a director, officer or controlling person of the
registrant in the successful defense of any action, suit or proceeding) is
asserted by such director, officer or controlling person in connection with
the securities being registered, the registrant will, unless in the opinion of
its counsel the matter has been settled by controlling precedent, submit to a
court of appropriate jurisdiction the question whether such indemnification by
it is against public policy as expressed in the Securities Act of 1933 and
will be governed by the final adjudication of such issue.
 
   The undersigned registrant hereby undertakes:
 
    (1) That, for purposes of determining any liability under the Securities
    Act of 1933, each filing of the registrant's annual report pursuant to
    Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934
    (and, where applicable, each filing of an employee benefit plans' annual
    report pursuant to Section 15(d) of the Securities Exchange Act of 1934)
    that is incorporated by reference in this registration statement shall be
    deemed to be a new registration statement relating to the securities
    offered therein, and the offering of such securities at that time shall be
    deemed to be the initial bona fide offering thereof;
 
    (2) To deliver or cause to be delivered with the prospectus, to each
    person to whom the prospectus is sent or given, the latest annual report
    to security holders that is incorporated by reference in the prospectus
    and furnished pursuant to and meeting the requirements of Rule 14a-3 or
    Rule 14c-3 under the Securities Exchange Act of 1934 and, where interim
    financial information required to be presented by Article 3 of Regulation
    S-X is not set forth in the prospectus, to deliver, or cause to be
    delivered to each person to whom the prospectus is sent or given, the
    latest quarterly report that is specifically incorporated by reference in
    the prospectus to provide such interim financial information;
 
                                     II-3
<PAGE>
 
    (3) That prior to any public reoffering of the securities registered
    hereunder through use of a prospectus which is a part of this registration
    statement, by any person or party who is deemed to be an underwriter
    within the meaning of Rule 145(c), the issuer undertakes that such
    reoffering prospectus will contain the information called for by the
    applicable registration form with respect to reofferings by persons who
    may be deemed underwriters, in addition to the information called for by
    the other items of the applicable form;
 
    (4) That every prospectus: (i) that is filed pursuant to paragraph (3)
    immediately preceding, or (ii) that purports to meet the requirements of
    Section 10(a)(3) of the Securities Act of 1933 and is used in connection
    with an offering of securities subject to Rule 415, will be filed as a
    part of an amendment to the registration statement and will not be used
    until such amendment is effective, and that, for purposes of determining
    any liability under the Securities Act of 1933, each such post-effective
    amendment shall be deemed to be a new registration statement relating to
    the securities offered therein, and the offering of such securities at
    that time shall be deemed to be the initial bona fide offering thereof;
 
    (5) To respond to requests for information that is incorporated by
    reference into this Joint Proxy Statement/Prospectus pursuant to Items 4,
    10(b), 11 or 13 of Form S-4, within one business day of receipt of such
    request, and to send the incorporated documents by first class mail or
    other equally prompt means. This includes information contained in
    documents filed subsequent to the effective date of the registration
    statement through the date of responding to the request; and
 
    (6) To supply by means of a post-effective amendment all information
    concerning a transaction, and the company being acquired involved therein,
    that was not the subject of and included in the registration statement
    when it became effective.
 
 
                                     II-4
<PAGE>
 
                                   SIGNATURES
 
   Pursuant to the requirements of the Securities Act of 1933, the registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-4 and has duly caused this registration
statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Houston, State of Texas, on the 2nd day of February,
1999.
 
                                          Santa Fe Energy Resources, Inc.
 
                                                    /s/ James L. Payne
                                          By: _________________________________
                                                      James L. Payne
                                                   Chairman of the Board
                                                and Chief Executive Officer
 
                               Power of Attorney
 
   KNOW ALL MEN BY THESE PRESENTS, that each of the undersigned officers and
directors of Santa Fe Energy Resources, Inc., hereby constitutes and appoints
James L. Payne and David L. Hicks (with full power to each of them to act
alone) his true and lawful attorney-in-fact and agent, with full power of
substitution, for him and on his behalf and in his name, place and stead, in
any and all capacities, to sign, execute and file this registration statement
under the Securities Act of 1933, as amended, and any or all amendments
(including, without limitation, post-effective amendments), with all exhibits
and any and all documents required to be filed with respect thereto, with the
Securities and Exchange Commission or any regulatory authority, granting unto
such attorneys-in-fact and agents, and each of them, full power and authority
to do and perform each and every act and thing requisite and necessary to be
done in and about the premises in order to effectuate the same, as fully to all
intents and purposes as he himself might or could do, if personally present,
hereby ratifying and confirming all that said attorneys-in-fact and agents, or
any of them, or their substitute or substitutes, may lawfully do or cause to be
done.
 
   Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed by the following persons in the
capacities indicated on February 2, 1999.
 
<TABLE>
<S>  <C> <C>
</TABLE>
              Signature                      Title
 
   /s/    James L. Payne             Chairman of the Board, Chief
- -----------------------------------  Executive Officer and Director
          James L. Payne             (Principal Executive Officer)
 
   /s/    Janet F. Clark             Senior Vice President and
- -----------------------------------  Chief Financial Officer
          Janet F. Clark             (Principal Financial and
                                     Accounting Officer)
 
   /s/  William E. Greehey           Director
- -----------------------------------
        William E. Greehey
 
   /s/    Melvyn N. Klein            Director
- -----------------------------------
          Melvyn N. Klein
 
                                      II-5
<PAGE>
 
<TABLE>
<S>  <C> <C>
</TABLE>
              Signature                      Title
 
   /s/   Allan V. Martini            Director
- -----------------------------------
         Allan V. Martini
 
   /s/  Reuben F. Richards           Director
- -----------------------------------
        Reuben F. Richards
 
   /s/  Kathryn D. Wriston           Director
- -----------------------------------
        Kathryn D. Wriston
 
                                      II-6
<PAGE>
 
                               INDEX TO EXHIBITS
 
<TABLE>
<CAPTION>
 Exhibit
 Number  Description
 ------- -----------
 <C>     <S>
  *2.1   Agreement and Plan of Merger, dated as of January 13, 1999 between
         Snyder Oil Corporation and Santa Fe Energy Resources, Inc. (included
         as Annex A to the Joint Proxy Statement/Prospectus).
   4.1   Restated Certificate of Incorporation (incorporated by reference to
         Exhibit 3.1 of the Form S-2 registration statement of Santa Fe Energy
         Resources, Inc. ("Santa Fe") File No. 33-32831).
   4.2   Bylaws, as amended September 1, 1998 (incorporated by reference to
         Exhibit 3(a) to Santa Fe's Quarterly Report on Form 10-Q for the
         period ended September 30, 1998).
   4.3   Rights Agreement dated as of March 3, 1997, between Santa Fe and First
         Chicago Trust of New York, as Rights Agent (incorporated by reference
         to Exhibit 1 to Santa Fe's Form 8-A filed February 28, 1997).
   4.4   Form of Amended Certificate of Designation of Series A Junior
         Participating Preferred Stock of Santa Fe (incorporated by reference
         to Exhibit 1 to Santa Fe's Form 8-A filed February 28, 1997).
   4.5   Form of Indenture dated as of May 25, 1994 and Form of Debenture
         relating to Santa Fe's 11% Senior Subordinated Debentures due 2004
         (incorporated by reference to Exhibit 4.1 of the Form S-3 registration
         statement of Santa Fe File No. 33-52849).
   4.6   First Supplemental Indenture, dated as of October 21, 1996, between
         Santa Fe and State Street Bank and Trust Company, as Trustee, relating
         to Santa Fe's 11% Senior Subordinated Debentures due 2004
         (incorporated by reference to Exhibit 10.1 to Santa Fe's Quarterly
         Report on Form 10-Q for the quarter ended September 30, 1996).
  *5.1   Opinion of Andrews & Kurth L.L.P. regarding legality of the securities
         to be registered.
  *8.1   Opinion of Andrews & Kurth L.L.P. regarding tax matters.
  *8.2   Opinion of Vinson & Elkins L.L.P. regarding tax matters.
 *23.1   Consents of Andrews & Kurth L.L.P. (included in the opinions filed as
         Exhibits 5.1 and 8.1 to this registration statement).
 *23.2   Consent of Vinson & Elkins L.L.P. (included in the opinion filed as
         Exhibit 8.2 to this registration statement).
 *23.3   Consent of PricewaterhouseCoopers LLP
 *23.4   Consent of Arthur Andersen LLP
 *23.5   Consent of Ryder Scott Company--Santa Fe
 *23.6   Consent of Netherland, Sewell & Associates, Inc.--Snyder
 *24.1   Powers of Attorney (included in the signature pages of this
         registration statement).
 *99.1   Consent of Donaldson, Lufkin & Jenrette Securities Corporation--
         Santa Fe
 *99.2   Consent of Chase Securities, Inc.--Santa Fe
 *99.3   Consent of Petrie Parkman & Co., Inc.--Snyder
 *99.4   Form of Santa Fe Proxy
 *99.5   Form of Snyder Proxy
</TABLE>
- --------
* Filed herewith
 
                                      II-7

<PAGE>
 
                                                                     EXHIBIT 5.1
 
                      [ANDREWS & KURTH L.L.P. LETTERHEAD]
 
                                February 1, 1999
 
Board of Directors
Santa Fe Energy Resources, Inc.
1616 South Voss Road
Houston, Texas 77057
 
Ladies and Gentlemen:
 
   We have acted as counsel to Santa Fe Energy Resources, Inc., a Delaware
corporation ("Santa Fe"), in connection with the proposed issuance by Santa Fe
of up to 73,695,219 shares (the "Shares") of common stock, par value $.01 per
share, of Santa Fe. The Shares are proposed to be offered to holders of common
stock of Snyder Oil Corporation, a Delaware corporation ("Snyder"), in
connection with the merger of Snyder with and into Santa Fe with Santa Fe as
the surviving corporation, pursuant to the Agreement and Plan of Merger dated
as of January 13, 1999 between Snyder and Santa Fe (the "Merger Agreement").
This opinion is being delivered in connection with Santa Fe's Registration
Statement on Form S-4 (the "Registration Statement") relating to the
registration of the offering and sale of the Shares under the Securities Act of
1933, as amended, pursuant to the Merger Agreement.
 
   As the basis for the opinion hereinafter expressed, we have examined such
statutes, regulations, corporate records and documents, certificates of
corporate and public officials and other instruments as we have deemed
necessary or advisable for the purposes of this opinion. In such examination,
we have assumed the authenticity of all documents submitted to us as originals
and the conformity with the original documents of all documents submitted to us
as copies.
 
   Based on the foregoing and on such legal considerations as we deem relevant,
we are of the opinion that the Shares to be issued by Santa Fe to shareholders
of Snyder as described in the Merger Agreement have been validly authorized
and, when issued and delivered in accordance with the Merger Agreement, will be
validly issued, fully paid and non-assessable.
 
   We hereby consent to the use of this opinion as an exhibit to the
Registration Statement and to the use of our name under the heading "Legal
Matters" in the Registration Statement.
 
                                          Very truly yours,
 
                                          /s/ ANDREWS & KURTH L.L.P.

<PAGE>
 
                                                                     EXHIBIT 8.1
 
                      [ANDREWS & KURTH L.L.P. LETTERHEAD]
 
                                February 1, 1999
 
Santa Fe Energy Resources, Inc.
1616 South Voss Road
10th Floor
Houston, Texas 77057
 
                                  TAX OPINION
 
Gentlemen:
 
   We have acted as counsel for Santa Fe Energy Resources, Inc., a Delaware
corporation ("Santa Fe"), in connection with the Agreement and Plan of Merger,
dated as of January 13, 1999 (the "Merger Agreement"), by and between Santa Fe
and Snyder Oil Corporation, a Delaware corporation ("Snyder"), pursuant to
which Snyder will be merged with and into Santa Fe.
 
   All statements of legal conclusions attributable to us in the discussion
under the caption "Material U.S. Federal Income Tax Consequences" in the joint
proxy statement/prospectus included in the Registration Statement on Form S-4
of Santa Fe filed in respect of the transactions contemplated in the Merger
Agreement reflect our opinion with respect to the matters set forth therein.
 
   We hereby consent to the references to our firm and this opinion contained
in the joint proxy statement/prospectus included in the Registration Statement.
 
                                          Very truly yours,
 
                                          /s/ Andrews & Kurth L.L.P.

<PAGE>
 
                                                                     EXHIBIT 8.2
 
                      [LETTERHEAD OF VINSON & ELKINS L.L.P.]
 
                                 February 1, 1999
 
Snyder Oil Corporation
777 Main Street, Suite 1400
Fort Worth, Texas 76102
 
Ladies and Gentlemen:
 
   We participated in the preparation of the registration statement on Form S-4
originally filed with the Securities and Exchange Commission by Santa Fe Energy
Resources, Inc. ("Santa Fe") on January 29, 1999 in connection with the merger
of Snyder Oil Corporation with and into Santa Fe (the "Registration
Statement"), including the discussion set forth in the joint proxy
statement/prospectus included in the Registration Statement under the heading
"Material U.S. Federal Income Tax Consequences." The discussion and the legal
conclusions with respect to United States federal income tax matters set forth
therein reflect our opinion, and we believe they are accurate and complete in
all material respects.
 
   Our opinion is based and conditioned upon the initial and continuing
accuracy of the facts and assumptions set forth in the Registration Statement.
Our opinion is also based upon provisions of the United States Internal Revenue
Code of 1986, as amended, regulations promulgated or proposed thereunder and
interpretations thereof by the Internal Revenue Service and the courts, all as
of the date of the Registration Statement, all of which are subject to change
with prospective or retroactive effect, and our opinion could be adversely
affected or rendered obsolete by any such change.
 
   We hereby consent to the use of our name in the Registration Statement and
to the filing of this opinion as part of the Registration Statement. This
consent does not constitute an admission that we are "experts" within the
meaning of such term as used in the United States Securities Act of 1933.
 
                                          Very truly yours,
 
                                          /s/ VINSON & ELKINS L.L.P.

<PAGE>
 
                                                                    Exhibit 23.3
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
We hereby consent to the incorporation by reference in the Joint Proxy
Statement/Prospectus constituting part of this Registration Statement on Form
S-4 of Santa Fe Energy Resources, Inc. of our report dated February 23, 1998
appearing on page 32 of Santa Fe Energy Resources, Inc.'s Annual Report on Form
10-K for the year ended December 31, 1997. We also consent to the reference to
us under the heading "Experts" in such Joint Proxy Statement/Prospectus.
 
/S/ PRICEWATERHOUSECOOPERS LLP
 
Houston, Texas
February 2, 1999

<PAGE>
 
                                                                    Exhibit 23.4
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
We hereby consent to the incorporation by reference in the Joint Proxy
Statement/Prospectus constituting part of this Registration Statement on Form
S-4 of Santa Fe Energy Resources, Inc. of our report dated February 10, 1998,
appearing on page 29 of Snyder Oil Corporation's Annual Report on Form 10-K for
the year ended December 31, 1997. We also consent to the reference to us under
the heading "Experts" in such Joint Proxy Statement/Prospectus.
 
                                          /s/ Arthur Andersen LLP
 
Fort Worth, Texas
February 1, 1999

<PAGE>
 
                                                                    Exhibit 23.5
 
           CONSENT OF INDEPENDENT PETROLEUM ENGINEERS AND GEOLOGISTS
 
   As independent petroleum engineers, we hereby consent to the incorporation
by reference in the Joint Proxy Statement/Prospectus constituting part of this
Registration Statement on Form S-4 of Santa Fe Energy Resources, Inc. of our
report in Santa Fe Energy Resources, Inc.'s Annual Report on Form 10-K for the
year ended December 31, 1997. We also consent to all references to our firm in
such Joint Proxy Statement/Prospectus.
 
                                        /s/ Ryder Scott Company
                                        Petroleum Engineers
                                        RYDER SCOTT COMPANY
                                        PETROLEUM ENGINEERS
 
Houston, Texas
January 29, 1999

<PAGE>
 
                                                                    Exhibit 23.6
 
           CONSENT OF INDEPENDENT PETROLEUM ENGINEERS AND GEOLOGISTS
 
   As independent petroleum consultants, we hereby consent to the incorporation
by reference in the Joint Proxy Statement/Prospectus constituting part of this
Registration Statement on Form S-4 of Santa Fe Energy Resources, Inc. of our
report in Snyder Oil Corporation's Annual Report on Form 10-K for the year
ended December 31, 1997. We also consent to all references to our firm in such
Prospectus.
 
                                      NETHERLAND, SEWELL & ASSOCIATES, INC.
 
                                      By:  /s/ Frederic D. Sewell
                                         --------------------------------------
                                          Frederic D. Sewell
                                          President
 
Dallas, Texas
January 29, 1999

<PAGE>
 
                                                                    EXHIBIT 99.1
 
   CONSENT OF DONALDSON, LUFKIN & JENRETTE SECURITIES CORPORATION
 
   We hereby consent to the use of our opinion letter, dated January 13, 1999,
to the Board of Directors of Santa Fe Energy Resources, Inc., which is included
as an exhibit to this Registration Statement, and all references to our firm
and such opinion letter included in the Joint Proxy Statement/Prospectus
forming a part of this Registration Statement. In giving such consent, we do
not admit that we come within the category of persons whose consent is required
under Section 7 of the Securities Act of 1933 and the rules and regulations
promulgated thereunder (the "Securities Act"), and we do not thereby admit that
we are experts with respect to any part of this Registration Statement under
the meaning of the term "expert" as used in the Securities Act.
 
                                        DONALDSON, LUFKIN & JENRETTE
                                           SECURITIES CORPORATION
 
                                                    /s/ Ralph Eads
                                        By: ___________________________________
                                        Name: Ralph Eads
 
                                        Title: Managing Director
 
Houston, Texas
January 29, 1999

<PAGE>
 
                                                                    Exhibit 99.2
 
                        CONSENT OF CHASE SECURITIES INC.
 
   We hereby consent to the use of our opinion letter to the Board of Directors
of Santa Fe Energy Resources, Inc., which is included as an exhibit to this
Registration Statement, and all references to our firm and such opinion letter
included in the Joint Proxy Statement/Prospectus forming a part of this
Registration Statement. In giving such consent, we do not admit that we come
within the category of persons whose consent is required under Section 7 of the
Securities Act of 1933 and the rules and regulations promulgated thereunder
(the "Securities Act"), and we do not thereby admit that we are experts with
respect to any part of this Registration Statement under the meaning of the
term "expert" as used in the Securities Act.
 
                                        CHASE SECURITIES INC.
 
                                                   /s/ James S. Bold
                                        By: ___________________________________
                                        Name:  James S. Bold
                                        Title:  Managing Director
 
New York, New York
January 29, 1999

<PAGE>
 
                                                                    Exhibit 99.3
 
                     CONSENT OF PETRIE PARKMAN & CO., INC.
 
   We hereby consent to the use of our opinion letter dated January 13, 1999 to
the Board of Directors of Snyder Oil Corporation, which is included as Annex D
to the Joint Proxy Statement/Prospectus forming a part of this Registration
Statement, and to references to our firm and such opinion letter in such Joint
Proxy Statement/Prospectus under the captions entitled "Summary--The Merger--
Fairness Opinions of Financial Advisors--Snyder's Fairness Opinion," "The
Merger--Background of the Merger," "The Merger--Reasons for the Merger--Snyder"
and "The Merger--Opinions of Financial Advisors--Snyder's Financial Advisor."
In giving such consent, we do not admit that we come within the category of
persons whose consent is required under Section 7 of Securities Act of 1933, as
amended, and the rules and regulations of the Securities and Exchange
Commission promulgated thereunder (the "Securities Act"), and we do not thereby
admit that we are experts with respect to any part of Registration Statement
under the meaning of the term "expert" as used in the Securities Act.
 
                                        PETRIE PARKMAN & CO., INC.
 
                                             /s/ Jim Parkman
                                        By: ___________________________________
 
                                                 Jim Parkman
                                        Name: _________________________________
 
                                                 President
                                        Title: ________________________________
 
Houston, Texas
January 29, 1999

<PAGE>
 
                                                                    Exhibit 99.4
 
                        SANTA FE ENERGY RESOURCES, INC.
                                   PROXY FOR
                        SPECIAL MEETING OF STOCKHOLDERS
                                       , 1999
 
  This Proxy is solicited on behalf of the Board of Directors. The undersigned
stockholder of Santa Fe Energy Resources, Inc., a Delaware corporation ("Santa
Fe"), hereby appoints James L. Payne and David L. Hicks, or either of them, as
proxies, each with power to act without the other and with full power of
substitution, for the undersigned to vote the number of shares of common stock
of Santa Fe that the undersigned would be entitled to vote if personally
present at the Special Meeting of Stockholders of Santa Fe to be held on
             ,             , at      a.m., local time, at
                                       , and at any adjournment or postponement
thereof, on the following matters that are more particularly described in the
Joint Proxy Statement/Prospectus dated             , 1999:
 
(1) Proposal to approve and adopt the Agreement and Plan of Merger, dated as of
    January 13, 1999, between Snyder Oil Corporation, a Delaware corporation
    ("Snyder"), and Santa Fe, relating to the merger of Snyder with and into
    Santa Fe, with Santa Fe surviving the merger including the issuance of
    shares of Santa Fe common stock in the merger, the change in the company's
    name to "Santa Fe Snyder Corporation" and the increase in the authorized
    shares of common stock to 300,000,000 shares of common stock of Santa Fe
    Snyder Corporation.
 
                     [_] FOR     [_] AGAINST    [_] ABSTAIN
 
(2) Proposal to elect, subject to the consummation of the merger, five
    individuals designated by Snyder to serve on the board of directors of
    Santa Fe.

       [_] FOR all nominees         [_] WITHHOLD AUTHORITY for all 
           listed below                 nominees listed below      

               to serve until Santa Fe's 1999 Annual Meeting of Stockholders,
               and                to serve until Santa Fe's 2000 Annual
  Meeting of Stockholders and               and              to serve until
  Santa Fe's 2001 Annual Meeting of Stockholders.

  INSTRUCTION: to withhold authority to vote for any individual nominee or
  nominees, write the appropriate name or names in the space provided here.

              --------------------------------------------------

(3) To consider and take action upon any other matter which may properly come
    before the meeting or any adjournment or postponement thereof.

                   (Continued and to be signed on other side)

                          (Continued from other side.)
 
  This proxy, when properly executed, will be voted in the manner directed
herein by the undersigned stockholder. If no direction is made, this proxy will
be voted "for" Proposal 1 and "for" Proposal 2. Receipt of the Joint Proxy
Statement/ Prospectus dated                 , 1999, is hereby acknowledged.
 
                                       ________________________________________

                                       ________________________________________
                                             Signature of Stockholder(s)
 
                                       Please sign your name exactly as it
                                       appears hereon. Joint owners must each
                                       sign. When signing as attorney,
                                       executor, administrator, trustee or
                                       guardian, please give your full title
                                       as it appears thereon.
 
                                       Date: ____________________________, 1999
 
        PLEASE MARK, SIGN, DATE AND RETURN USING THE ENCLOSED ENVELOPE.

<PAGE>
 
                                                                    Exhibit 99.5
 
                             SNYDER OIL CORPORATION
                                   PROXY FOR
                        SPECIAL MEETING OF STOCKHOLDERS
                                       , 1999
 
  This Proxy is solicited on behalf of the Board of Directors. The undersigned
stockholder of Snyder Oil Corporation, a Delaware corporation ("Snyder"),
hereby appoints                   and                   , or either of them, as
proxies, each with power to act without the other and with full power of
substitution, for the undersigned to vote the number of shares of common stock
of Snyder that the undersigned would be entitled to vote if personally present
at the Special Meeting of Stockholders of Snyder to be held on              ,
              , at          a.m., local time, at
                                       , and at any adjournment or postponement
thereof, on the following matters that are more particularly described in the
Joint Proxy Statement/Prospectus dated             , 1999:
 
(1) Proposal to approve and adopt the Agreement and Plan of Merger, dated as of
    January 13, 1999, between Snyder and Santa Fe Energy Resources, Inc., a
    Delaware corporation ("Santa Fe"), relating to the merger of Snyder with
    and into Santa Fe, with Santa Fe surviving the merger.
 
                     [_] FOR     [_] AGAINST    [_] ABSTAIN
 
(2) To consider and take action upon any other matter which may properly come
    before the meeting or any adjournment or postponement thereof.
 
                   (Continued and to be signed on other side)
                          (Continued from other side.)
 
  This proxy, when properly executed, will be voted in the manner directed
herein by the undersigned stockholder. If no direction is made, this proxy will
be voted "for" Proposal 1. Receipt of the Joint Proxy Statement/ Prospectus
dated                 , 1999, is hereby acknowledged.
 
                                       ----------------------------------------
                                       ----------------------------------------
                                             Signature of Stockholder(s)
 
                                       Please sign your name exactly as it
                                       appears hereon. Joint owners must each
                                       sign. When signing as attorney,
                                       executor, administrator, trustee or
                                       guardian, please give your full title
                                       as it appears thereon.
 
                                       Date: ____________________________, 1999
 
        PLEASE MARK, SIGN, DATE AND RETURN USING THE ENCLOSED ENVELOPE.


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