PURE RESOURCES INC
S-8, 2000-05-25
OIL & GAS FIELD EXPLORATION SERVICES
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<PAGE>

      As filed with the Securities and Exchange Commission on May 25,2000
                                             Registration Statement No. 333-
================================================================================
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549
                           ------------------------

                            REGISTRATION STATEMENT
                                  ON FORM S-8
                       UNDER THE SECURITIES ACT OF 1933
                           ------------------------

                             PURE RESOURCES, INC.
            (Exact name of registrant as specified in its charter)

           Delaware                                      74-2952918
(State or other jurisdiction                (I.R.S. Employer Identification No.)
of incorporation or organization)

       500 West Texas, Suite 200                           79701
         Midland, Texas  79701                           (Zip Code)
(Address of principal executive offices)

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

                          Pure Resources 401(k) Plan
                             (Full title of  plan)
                           ------------------------

                               Jack D. Hightower
                           500 West Texas, Suite 200
                              Midland, Texas 79701
                                 (915) 498-8600
           (Name, address and telephone number of agent for service)

                                    Copy to:
                                Joe Dannenmaier
                            Thompson & Knight L.L.P.
                        1700 Pacific Avenue, Suite 3300
                              Dallas, Texas 75201
                                 (214) 969-1700
                            ------------------------

                        CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
===================================================================================================================================
       Title of securities to be           Amount to be    Proposed maximum offering        Proposed maximum           Amount of
               registered                 registered (1)      price per share(2)        aggregate offering price    registration fee
                                                                                                  (2)
<S>                                       <C>              <C>                          <C>                         <C>
Common Stock, par value $.01 per share..     500,000               $13.36                      $6,682,450                $1,765
                                             shares
===================================================================================================================================
</TABLE>

(1)  Pursuant to Rule 416 under the Securities Act of 1933, this Registration
     Statement shall also be deemed to register (a) an indeterminate amount of
     interests to be offered or sold pursuant to the Pure 401(k) Plan and (b)
     such additional indeterminate shares as may be issuable as a result of a
     stock split, stock dividend or similar transaction with respect to the
     shares covered hereby.

(2)  Estimated solely for the purpose of determining the registration fee
     pursuant to Rule 457, with price per share based on the market value of the
     Titan Exploration, Inc. Common Stock to be exchanged in the merger
     described in "Introductory Statement"), as the quotient of (a) $5.75 (the
     average of the high and low sales prices for Titan Exploration, Inc. Common
     Stock on the Nasdaq National Market on May 19, 2000) by  (b) the exchange
     ratio for the merger of .4302314 shares of Pure Resources, Inc. Common
     Stock for each outstanding share of Titan Exploration, Inc. Common Stock.

================================================================================
<PAGE>

                             INTRODUCTORY STATEMENT

   Pursuant to an Agreement and Plan of Merger (the "Merger Agreement") dated as
of December 13, 1999, as amended, Titan Exploration, Inc. ("Titan") and the
Registrant intend to consummate on May 25, 2000 a merger (the "Merger") whereby
a wholly-owned subsidiary of the Registrant will be  merged with and into Titan,
with Titan surviving the Merger as a wholly-owned subsidiary of the Registrant.
In the Merger, shares of Titan common stock will be converted into the right to
receive shares of the Registrant's common stock.   In addition, in connection
with and effective upon consummation of the merger, the Titan 401(k) Plan will
be amended to change its name to the Pure Resources 401(k) Plan and substitute
references to the Registrant's common stock for references to Titan's common
stock.  This Registration Statement  relates to 500,000 shares of the
Registrant's common stock which may be purchased after the Merger under the Pure
Resources 401(k) Plan and an indeterminate number of interests in the Pure
Resources 401(k) Plan.

                                     PART I

              INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS

Item 1.  Plan Information.*
         ----------------

Item 2.  Registrant Information and Employee Plan Annual Information.*
         -----------------------------------------------------------

_____________

*  Information required by Part I to be contained in the Section 10(a)
   prospectus is omitted from this Registration Statement in accordance with
   Rule 428 under the Securities Act of 1933 and the Note to Part I of Form S-8.
<PAGE>

                                    PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3.  Incorporation of Documents by Reference.
         ---------------------------------------

   The following documents have been filed by the Registrant with the Securities
and Exchange Commission and are incorporated by reference in this Registration
Statement:

   (1) The proxy statement/prospectus included in the Registrant's Registration
   Statement on Form S-4 (No. 333-34970) filed on April 18, 2000.

   (2) The description of the Registrant's Common Stock, $.01 par value per
   share, contained in the Registration Statement on Form 8-A of the Company
   heretofore filed with the Commission, including any amendments or reports
   filed for the purpose of updating such description.

   In addition, all documents filed by the Registrant pursuant to Sections
13(a), 13(c), 14 and 15(d) of the Securities Exchange Act of 1934 subsequent to
the date of this Registration Statement and prior to the filing of a post-
effective amendment which indicates that all securities offered have been sold
or which deregisters all securities then remaining unsold shall be deemed to be
incorporated by reference in this Registration Statement and to be a part hereof
from the date of filing of such documents.  Any statement contained in a
document incorporated or deemed to be incorporated by reference herein shall be
deemed to be modified or superseded for purposes of this Registration Statement
to the extent that a statement contained herein or in any other subsequently
filed document which also is or is deemed to be incorporated by reference herein
modifies or supersedes such statement.  Any statement so modified or superseded
shall not be deemed, except as so modified or superseded, to constitute a part
of this Registration Statement.  Upon the written or oral request of any person
to whom a copy of this Registration Statement has been delivered, the Company
will provide without charge to such person a copy of any and all documents
(excluding exhibits thereto unless such exhibits are specifically incorporated
by reference into such documents) that have been incorporated by reference into
this Registration Statement but not delivered herewith.  Requests for such
documents should be addressed to Pure Resources, Inc., 500 West Texas, Suite
200, Midland, Texas  79701, Attention:  Corporate Secretary, (915) 498-8600.


Item 4.  Description of Securities.
         -------------------------

   Not applicable.


Item 5.  Interests of Named Experts and Counsel.
         --------------------------------------

   Not Applicable.


Item 6.  Indemnification of Directors and Officers.
         -----------------------------------------

   Section 102(b) of the Delaware General Corporation Law ("DGCL") allows a
corporation to include in its certificate of incorporation a provision to
eliminate or limit the personal liability of a director to the registrant or its
stockholders for monetary damages for breach of fiduciary duty as a director,
except in cases where the director breached his or her duty of loyalty to the
registrant or its stockholders, failed to act in good faith, engaged in
intentional misconduct or a knowing violation of a law, willfully or negligently
authorized the unlawful payment of a dividend or approved an illegal stock
repurchase (as provided in Section 174 of the DGCL) or obtained an improper
personal benefit.  The registrant's certificate of incorporation, as amended,
contains provisions that eliminate directors' personal liability, in certain
circumstances, as set forth below.

                                      II-1
<PAGE>

   The registrant's certificate of incorporation, as amended, provides, that a
director will not be personally liable to the registrant or its stockholders for
monetary damages for breach of duty as a director, except for liability (i) for
any breach of the director's duty of loyalty to the registrant 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 DGCL or (iv) for any transaction from which the director derived an improper
personal benefit.

   The registrant's certificate of incorporation, as amended, provides that each
person who was or is made a party or is threatened to be made a party to or is
involved in any action, suit or proceeding, whether civil, criminal,
administrative or investigative (hereinafter a "proceeding"), by reason of the
fact that he or she, or a person of whom he or she is the legal representative,
is or was a director or officer of the registrant, or serves, in any capacity,
any corporation, partnership or other entity in which the registrant has a
partnership or other interest, including service with respect to employee
benefit plans, whether the basis of such proceeding is alleged action in an
official capacity as a director, officer, employee or agent or in any other
capacity while serving as a director, officer, employee or agent, shall be
indemnified and held harmless by the registrant to the fullest extent authorized
by the DGCL, as the same exists or may hereafter be amended (but, in case of any
such amendment, only to the extent that such amendment permits the registrant to
provide broader indemnification rights than said law permitted the registrant to
provide prior to such amendment), against all expense, liability and loss
(including attorneys' fees, judgments, fines, ERISA excise taxes or penalties
and amounts paid or to be paid in settlement) reasonably incurred or suffered by
such person in connection therewith and such indemnification shall continue as
to a person who has ceased to be a director, officer, employee or agent and
shall inure to the benefit of his or her heirs, executors and administrators.

   Pursuant to the registrant's certificate of incorporation, as amended, it
shall indemnify and hold harmless in such manner any person designated by the
Board of Directors, or any authorized committee thereof, as a person subject to
this indemnification provision, and who was or is made a party or is threatened
to be made a party to a proceeding by reason of the fact that he, she or a
person of whom he or she is the legal representative, is or was serving at the
request of the Board of Directors of the registrant as a director, officer,
employee or agent of another corporation or a partnership, joint venture, trust
or other enterprise whether such request is made before or after the acts taken
or allegedly taken or events occurring or allegedly occurring which give rise to
such proceeding.

   The registrant has a duty to indemnify any person seeking indemnification
pursuant to the registrant's certificate of incorporation in connection with a
proceeding (or part thereof) initiated by that person only if the proceeding (or
part thereof) was authorized by the Board of Directors of the registrant.

   The registrant may, by action of its Board of Directors, provide
indemnification to employees or agents of the registrant with the same scope and
effect as the foregoing indemnification of directors and officers.

   The registrant may maintain insurance, at its expense, to protect itself and
any director officer, employee or agent of the registrant or another
corporation, partnership, joint venture, trust or other enterprise against any
such expense, liability or loss, whether or not the registrant would have the
power to indemnify such person against such expense, liability or loss under the
DGCL.

Item 7.  Exemption from Registration Claimed.
         -----------------------------------

   Not Applicable.


Item 8.  Exhibits.
         --------

   The following documents are filed as exhibits to this Registration Statement:

       4.1     Titan 401(k) Plan (filed as Exhibit 4.1 to Titan Exploration,
               Inc.'s Registration Statement on Form S-8 (No. 333-62115) filed
               on August 24, 1998 and incorporated herein by reference).

       4.1.1   Amendment to Titan 401(k) Plan, renaming it the Pure Resources
               401(k) Plan and otherwise amending the plan, in each case as of
               effectiveness of the merger described in "Introductory Statement"
               above.

                                      II-2
<PAGE>

       4.2   Agreement and Plan of Merger, dated as of December 13, 1999, by and
             among Union Oil Company of California, Pure Resources, Inc.
             (formerly named Titan Resources Holdings, Inc.), TRH, Inc. and
             Titan Exploration, Inc. and Amendment No. 1 to Merger Agreement
             dated as of April 14, 2000 (filed as Exhibit 2.1 to Titan
             Exploration, Inc.'s Current Report on Form 8-K filed on December
             23, 1999 and Exhibit 2.2 to the Registrant's Form S-4 (No. 333-
             34970) and incorporated herein by reference).

       5.1   Opinion of Thompson & Knight L.L.P.

       23.1  Consent of Thompson & Knight L.L.P. (included in the opinion of
             Thompson & Knight L.L.P. filed herewith as Exhibit 5.1).

       23.2  Consent of KPMG LLP.

       23.3  Consent of PricewaterhouseCoopers LLP

       23.4  Consent of Williamson Petroleum Consultants, Inc., independent
             petroleum engineers.

       23.5  Consent of Gary Dupriest, Vice President of Pure Resources.

       23.6  Consent of Twachtman Snyder & Byrd, Inc., independent consultants.

       24.1  Power of Attorney (included on signature page of this Registration
             Statement).

   In lieu of the opinion of counsel concerning compliance with the requirements
of ERISA and an IRS determination letter regarding qualification under Section
401 of the Internal Revenue Code, the Registrant undertakes that it will submit
or has submitted the Pure 401(k) Plan and any amendment thereto to the IRS in a
timely manner and has made or will make all changes required by the IRS in order
to qualify the plan.


Item 9.  Undertakings.
         ------------

   The Registrant hereby undertakes:

       (1)  To file, during any period in which offers or sales are being made,
   a post-effective amendment to this Registration Statement:

          (i)  To include any prospectus required by Section 10(a)(3) of the
       Securities Act of 1933;

          (ii) To reflect in the prospectus any facts or events arising after
       the effective date of this Registration Statement (or the most recent
       post-effective amendment thereof) which, individually or in the
       aggregate, represent a fundamental change in the information set forth in
       this Registration Statement.  Notwithstanding the foregoing, any increase
       or decrease in volume of securities offered (if the total dollar value of
       securities offered would not exceed that which was registered) and any
       deviation from the low or high end of the estimated maximum offering
       range may be reflected in the Form of prospectus filed with the
       Commission pursuant to Rule 424(b) if, in the aggregate, the changes in
       volume and price represent no more than a 20% change in the maximum
       aggregate offering price set forth in the "Calculation of Registration
       Fee" table in the effective registration statement; and

          (iii)  To include any material information with respect to the plan of
       distribution not previously disclosed in this Registration Statement or
       any material change to such information in this Registration Statement;

   provided, however, that paragraphs (1)(i) and (1)(ii) do not apply if the
   information required to be included in a post-effective amendment by those
   paragraphs is contained in periodic reports filed by the Registrant pursuant
   to

                                      II-3
<PAGE>

   Section 13 or Section 15(d) of the Securities Exchange Act of 1934 that
   are incorporated by reference in this Registration Statement.

       (2) That, for the purpose 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.

       (3) To remove from registration by means of a post-effective amendment
   any of the securities being registered which remain unsold at the termination
   of the offering.

       (4) 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 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.

       (5) 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 foregoing provisions,
   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 Act 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 Act and will be governed by the final
   adjudication of such issue.

                                      II-4
<PAGE>

                                   SIGNATURES

   Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in Sugarland, Texas (with respect
to Pure Resources,Inc.) and in Midland, Texas, on the 24th day of May, 2000.

                                   PURE RESOURCES, INC.


                                   By: /s/ Timothy H. Ling
                                       ----------------------------------------
                                       Timothy H. Ling
                                       President


                                   TITAN 401(K) PLAN (to be amended and renamed
                                   PURE 401(K) PLAN upon effectiveness of the
                                   merger described in "Introductory Statement"
                                   above)

                                   By: Titan Resources, I, Inc., Administrator


                                   By: /s/ Jack Hightower
                                       ----------------------------------------
                                       Jack Hightower
                                       President

     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities and on the dates indicated.  Each person whose signature appears
below constitutes and appoints Barry Hoffman and Phillip Ballard, and each of
them (with full power to each of them to act alone), his true and lawful
attorney-in-fact and agent, with full power of substitution and resubstitution,
for him and in his name, place and stead, in any and all capacities to sign on
his behalf individually and in each capacity stated below any amendment,
including post-effective amendments, to this Registration Statement, and to file
the same, with all exhibits thereto and other documents in connection therewith
with the Securities and Exchange Commission, granting unto said 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, as fully to all intents and purposes as he might or could do in
person, hereby ratifying and confirming all that said attorneys-in-fact and
agents and either of them, or their substitutes, may lawfully do or cause to be
done by virtue hereof.

          Signature                    Title                      Date
          ---------                    -----                      ----


/s/ Timothy H. Ling            President and Director         May 24, 2000
- -----------------------------
Timothy H. Ling                (Principal Executive Officer)



/s/ Darrell Chessum            Vice President, Treasurer      May 24, 2000
- -----------------------------
Darrell Chessum                and Director
                               (Principal Financial and
                               Accounting Officer)

                                      II-5
<PAGE>

                               INDEX TO EXHIBITS

Exhibit Number                           Exhibit
- --------------                           -------


       4.1           Titan 401(k) Plan (filed as Exhibit 4.1 to Titan
                     Exploration, Inc.'s Registration Statement on Form S-8 (No.
                     333-62115) filed on August 24, 1998 and incorporated herein
                     by reference).

       4.1.1         Amendment to Titan 401(k) Plan, renaming it the Pure
                     Resources 401(k) Plan and otherwise amending the plan, in
                     each case as of effectiveness of the merger described in
                     "Introductory Statement" above.

      4.2            Agreement and Plan of Merger, dated as of December 13,
                     1999, by and among Union Oil Company of California, Pure
                     Resources, Inc. (formerly named Titan Resources Holdings,
                     Inc.), TRH, Inc. and Titan Exploration, Inc. and Amendment
                     No. 1 to Merger Agreement dated as of April 14, 2000 (filed
                     as Exhibit 2.1 to Titan Exploration, Inc.'s Current Report
                     on Form 8-K filed on December 23, 1999 and Exhibit 2.2 to
                     the Registrant's Form S-4 (No. 333-34970) and incorporated
                     herein by reference).

      5.1            Opinion of Thompson & Knight L.L.P.

      23.1           Consent of Thompson & Knight L.L.P. (included in the
                     opinion of Thompson & Knight L.L.P. filed herewith as
                     Exhibit 5.1).

      23.2           Consent of KPMG LLP.

      23.3           Consent of PricewaterhouseCoopers LLP

      23.4           Consent of Williamson Petroleum Consultants, Inc.,
                     independent petroleum engineers.

      23.5           Consent of Gary Dupriest, Vice President of Pure Resources.

      23.6           Consent of Twachtman Snyder & Byrd, Inc., independent
                     consultants.

      24.1           Power of Attorney (included on signature page of this
                     Registration Statement).

                                      II-6

<PAGE>

                                                                   Exhibit 4.1.1

                                AMENDMENT NO. 1
                                    TO THE
                               TITAN 401(k) PLAN
          (As Amended and Restated Effective as of September 1, 1998)
           ---------------------------------------------------------

     This Amendment to the Titan 401(k) Plan (As Amended and Restated Effective
as of September 1, 1998) (the "Plan") made and executed by Titan Resources I,
Inc. (the "Company") and approved by Titan Exploration, Inc. ("Titan") and Pure
Resources, Inc. ("Pure"),

                        W I T N E S S E T H   T H A T :

     WHEREAS, the common stock of Titan is an investment option under the Plan;
and

     WHEREAS, Titan entered into an Agreement and Plan of Merger dated as of
December 13, 1999, as amended (the "Merger Agreement") by and among Titan, Union
Oil Company of California, Pure, a direct wholly-owned subsidiary of Union Oil
Company of California, and TRH, Inc., a wholly-owned subsidiary of Pure ("TRH");
and

     WHEREAS, the Merger Agreement relates to a reverse triangular merger of
Titan with and into TRH, pursuant to which at the effective time of the Merger
pursuant to applicable law (the "Effective Time"), Titan's stockholders would
receive stock of Pure in exchange for their shares in Titan (the "Merger"); and

     WHEREAS, the Company wishes to amend the Plan (and Titan and Pure wish to
approve such amendment) to reflect that shares of Pure will be available for
investment under the Plan as of the Effective Time, to change the Plan name and
to make certain other changes;

     NOW, THEREFORE, in consideration of the premises and pursuant to the
provisions of Section 8.1 thereof, the Company hereby amends the Plan in the
following respects only:

     FIRST:  Subject to the consummation of the Merger and effective as of the
     -----
Effective Time, the Plan is hereby amended to change the Plan name from the
"Titan 401(k) Plan" to the
<PAGE>

"Pure Resources 401(k) Plan."

     SECOND:  Subject to the consummation of the Merger and effective as of the
     ------
Effective Time, Section 1.1(g) of the Plan is hereby amended by restatement in
its entirety to read as follows:

          (g) A "Change of Control" shall be deemed to have occurred for
     purposes of the Plan if (i) Pure Resources, Inc. enters into any merger,
     consolidation or recapitalization pursuant to which the persons serving as
     directors of Pure Resources, Inc. immediately before such transaction cease
     to constitute at least 40% of the members of the board of directors of the
     surviving entity (whether Pure Resources, Inc. or another entity) following
     consummation of such transaction, (ii) Pure Resources, Inc. sells, leases
     or exchanges or agrees to sell, lease or exchange all or substantially all
     of its assets to any other person or entity, or (iii) Pure Resources, Inc.
     is to be dissolved and liquidated.

     THIRD:  Subject to the consummation of the Merger and effective as of the
     -----
day prior to the Effective Time, Section 1.1(u) of the Plan is hereby amended by
restatement in its entirety to read as follows:

          (u) "Entry Date" means the first day of each calendar quarter;
     provided, however, that if Titan Exploration, Inc., the Company or another
     Employer is a party to a transaction that results in a new group of
     employees being eligible to participate in the Plan, the Committee may
     establish additional Entry Dates if the Committee determines in its sole
     discretion such additional Entry Dates to be appropriate for purposes of
     allowing such new group of employees who become Covered Employees
     immediately following the transaction to enter the Plan.

     FOURTH:  Subject to the consummation of the Merger and effective as of the
     ------
Effective Time, Section 1.1(ee) of the Plan is hereby amended by restatement in
its entirety to read as follows:

          (ee) "Plan" means this Pure Resources 401(k) Plan, as amended and
     restated effective as of September 1, 1998, and as from time to time in
     effect thereafter.

     FIFTH:  Subject to the consummation of the Merger and effective as of the
     -----
Effective Time, Section 1.1(mm) and (nn) of the Plan are hereby amended by
restatement in their entirety to read as follows:
<PAGE>

          (mm) "Pure Resources Matching Plan" means the Pure Resources Matching
     Plan, effective as of September 1, 1998, and as from time to time in effect
     thereafter.

          (nn) "Pure Resources Stock" means the common stock of Pure Resources,
     Inc., a Delaware corporation, and any successor thereto.

     SIXTH:  Subject to the consummation of the Merger and effective as of the
     -----
Effective Time, all references in the Plan to the "Titan Matching Plan" are
hereby replaced with references to the "Pure Resources Matching Plan."

     SEVENTH:  Subject to the consummation of the Merger and effective as of the
     -------
Effective Time, all references in the Plan to the "Titan Stock" are hereby
replaced with references to the "Pure Resources Stock."

     EIGHTH:  Subject to the consummation of the Merger and effective as of the
     ------
Effective Time, all references in the Plan to the "Titan 401(k) Trust" are
hereby replaced with references to the "Pure Resources 401(k) Trust."

     IN WITNESS WHEREOF, this Amendment has been executed as of this ___ day of
May, 2000.

                                    TITAN RESOURCES I, INC.

                                    By:  /s/ William K. White
                                         ----------------------------------
                                         Name:  William K. White
                                                ---------------------------
                                         Title: Vice President-Finance, CFO
                                                ---------------------------

ACCEPTED AND APPROVED:              ACCEPTED AND APPROVED:

PURE RESOURCES, INC.                TITAN EXPLORATION, INC.



By:   /s/ P. R. Ballard             By:  /s/ William K. White
      -------------------------          ----------------------------------
     Name:  P. R. Ballard                Name:  William K. White
            -------------------                 ---------------------------
     Title: Vice President               Title: Vice President-Finance, CFO
            -------------------                 ---------------------------


<PAGE>

(214) 969-1700                                                       Exhibit 5.1

                                 May 25, 2000


Pure Resources, Inc.
500 West Texas, Suite 500
Midland, Texas 79701

   Re:  Registration Statement on Form S-8

Ladies and Gentlemen:

   We have acted as counsel for Pure Resources, Inc., a Delaware corporation
(the "Company"), in connection with the registration under the Securities Act of
1933, as amended (the "Securities Act"), of an aggregate of 500,000 shares of
the Company's Common Stock, $.01 par value per share (the "Shares"), for
issuance under the Pure Resources 401(k) Plan ( the "Plan") and of an
indeterminate amount of interests in the Plan (the "Interests").

   We have participated in the preparation of the Company's Registration
Statement on Form S-8 (the "Registration Statement"), filed with the Securities
and Exchange Commission, relating to the registration of the Shares and the
Interests under the Securities Act.

   In connection with the foregoing, we have examined the originals or copies,
certified or otherwise authenticated to our satisfaction, of the resolutions of
the Company's Board of Directors establishing the Plan, the Registration
Statement and such corporate records of the Company, certificates of officers of
the Company, and other instruments and documents as we have deemed necessary to
require as a basis for the opinion hereinafter expressed.  As to various
questions of fact material to such opinion, we have, where relevant facts were
not independently established, relied upon statements of officers of the Company
whom we believe to be responsible.

   In rendering this opinion, we have assumed that prior to the issuance of the
Shares, the transactions contemplated by the merger agreement described in the
Registration Statement will have been consummated in accordance with the terms
thereof.

   Based upon the foregoing and in reliance thereon, we advise you that in our
opinion (i) the Shares, when issued and delivered in accordance with the
provisions of the Plan, will be legally issued, fully paid and nonassessable,
and (ii) the Interests, when offered and issued in accordance with the
provisions of the Plan, will be legally issued, fully paid and nonassessable.

   We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement.

                                         Respectfully submitted,



                                         THOMPSON & KNIGHT L.L.P.

<PAGE>

                                                                    Exhibit 23.2

                        CONSENT OF INDEPENDENT AUDITORS


The Board of Directors
Pure Resources, Inc.

     We consent to the use of our report dated February 1, 2000 on the
consolidated financial statements of Titan Exploration, Inc. as of December 31,
1999 and 1998 and for each of the years in the three-year period ended December
31, 1999, incorporated by reference herein.



                                       KPMG LLP


Midland Texas
May 25, 2000


<PAGE>

                                                                    EXHIBIT 23.3




                       CONSENT OF INDEPENDENT ACCOUNTANTS

The Board of Directors of Pure Resources, Inc.

     We hereby consent to the incorporation by reference in this Registration
Statement on Form S-8 of our report dated March 10, 2000 relating to the
financial statements of Pure Resources, Inc., formerly referred to as Union
Oil's Permian Basin business unit, which appears in Pure Resources, Inc.'s
Registration Statement on Form S-4 (File No. 333-34970).



PricewaterhouseCoopers LLP
Houston, Texas

May 25, 2000

<PAGE>

                                                                  EXHIBIT 23.4

               CONSENT OF WILLIAMSON PETROLEUM CONSULTANTS, INC.

     As independent oil and gas consultants, Williamson Petroleum Consultants,
Inc. hereby consents to the incorporation by reference in the registration
statement on Form S-8 to be filed by Pure Resources, Inc. on or about the date
hereof, of all references to our firm included in the proxy/statement prospectus
of Pure Resources, Inc. in its registration statement on Form S-4 (File No. 333-
34970), including under the heading of "Experts" in the proxy
statement/prospectus.



                                    WILLIAMSON PETROLEUM CONSULTANTS, INC.


Midland, Texas
May 25, 2000

<PAGE>

                                                                    Exhibit 23.5


                          CONSENT OF RESERVE ENGINEER

The Board of Directors of Pure Resources, Inc.

     I hereby consent to the incorporation by reference in the registration
statements on Form S-8 to be filed by Pure Resources, Inc. on or about the date
hereof, of references to my name included in the proxy/statement prospectus of
Pure Resources, Inc in its Registration Statement on Form S-4 (File No. 333-
34970), including under the heading "Experts" in the proxy statement/prospectus.


/s/ Gary M. Dupriest
- --------------------------------------
Gary Dupriest
Vice President - Pure Resources, Inc.

May 25, 2000

<PAGE>

                                                                    EXHIBIT 23.6

                        CONSENT OF INDEPENDENT ENGINEERS

The Board of Directors of Pure Resources, Inc.

     We hereby consent the incorporation by reference in the registration
statements on Form S-8 to be filed by Pure Resources, Inc. on or about the date
hereof, of references to our decommissioning estimates and references to our
firm included or incorporated in the proxy/statement prospectus of Pure
Resources, Inc in its Registration Statement on Form S-4 (File No. 333-34970),
including under the heading "Experts" in the proxy statement/prospectus.


 /s/ Robert C. Byrd
- -----------------------------------
Twachtman Snyder & Byrd, Inc
Robert C. Byrd
Vice President

May 25, 2000


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