EXHIBIT 2.2




                         BUSINESS OPPORTUNITY AGREEMENT


     This Business Opportunity Agreement (this "Agreement"),  dated as of May 2,
1996,  is made by and among  Snyder  Oil  Corporation,  a  Delaware  corporation
("Snyder"), and Patina Oil & Gas Corporation, a Delaware corporation ("Patina").

                                    RECITALS:

     WHEREAS, Snyder, Patina, Patina Merger Corporation, a Delaware corporation,
and Gerrity Oil & Gas  Corporation,  a Delaware  corporation  ("Gerrity"),  have
entered into that certain Amended and Restated Agreement and Plan of Merger (the
"Merger Agreement") dated as of January 16, 1996  and as amended and restated as
of March 20, 1996;

     WHEREAS,  as a result of the  transactions  contemplated  under the  Merger
Agreement, Gerrity is a wholly-owned subsidiary of Patina and Patina is majority
owned by Snyder with minority ownership  initially in the former stockholders of
Gerrity;

     WHEREAS,  Snyder and Patina now desire to  delineate  rights as between the
two companies and certain of their  affiliates with respect to certain  business
opportunities arising after the consummation of the transactions contemplated by
the Merger Agreement;

     NOW THEREFORE,  in consideration of premises and mutual covenants set forth
herein  and in the  Merger  Agreement,  as  well  as  other  good  and  valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, the
parties hereto agree as follows:

     Section 1. Certain Definitions.  When used herein the following terms shall
have the meanings indicated:

     "Business  Opportunity"  shall mean any actual or potential  opportunity to
enter into an Energy Business Transaction.

     "Control" and its correlative terms shall mean the possession,  directly or
indirectly,  of the  power to direct or cause the  direction  of  management  or
policies  (whether  through  ownership of securities or any partnership or other
ownership  interest,  by contract or otherwise) of a Person. For the purposes of
the  preceding  sentence,  control  shall  include the  possession,  directly or
indirectly,  through  one or  more  intermediaries,  of  (A) in  the  case  of a
corporation,  50% or more of the outstanding voting securities  thereof;  (B) in
the case of a limited liability  company,  partnership,  limited  partnership or
venture,  the  right to 50% or more of the  distributions  therefrom  (including
liquidating distributions); and (C) in the case of any other Person, 50% or more
of the economic or beneficial interest therein.

     "Energy Business  Transaction" shall mean any transaction pursuant to which
any Person would acquire  (whether by purchase,  lease,  or other  transaction),
own, invest in, finance, lend funds

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to,  contribute  capital to,  manage,  operate or otherwise  participate  in any
Person, assets, or transaction involving any energy-related business,  including
all phases of energy exploration, production and transportation.

     "Patina  Entity"  shall mean  Patina and any  Person  Controlled  by Patina
(together, the "Patina Entities").

     "Person"  means  any  natural  person,  corporation,  limited  partnership,
limited  liability  company,  general  partnership,  joint stock company,  joint
venture, association,  company, trust, bank, trust company, land trust, business
trust, or other organization, whether or not a legal entity.

     "Significant Steps" means the commitment of human or financial resources in
pursuit of a Business Opportunity including,  without limitation, the commitment
of  engineering,  financial,  legal,  accounting or other  resources  (including
in-house resources) to the process of evaluating the Business  Opportunity,  the
signing of a confidentiality or lockup agreement, letter of intent or memorandum
of  understanding,  or the exchange of proposals or negotiations with management
of a Person that is the  subject of the  Business  Opportunity  or that owns the
property that is the subject of the Business Opportunity.

     "Snyder Entity" shall mean Snyder and any Person Controlled by Snyder other
than Patina and the Patina Entities (together, the "Snyder Entities").

     "Wattenberg Field" means the area from Townships 2 South to 7 North, Ranges
62 to 69 West, Adams, Weld, Larimer and Boulder Counties, Colorado.

     Section 2.  Business  Opportunities  Outside  the Areas of  Interest.  With
respect  to  any  Business   Opportunity   relating   primarily  to  operations,
properties,  assets,  rights,  liabilities,  and obligations  outside either the
Patina Area of Interest or the Snyder  Area of Interest  (each,  as  hereinafter
defined, and together, the "Areas of Interest"),  then such Business Opportunity
may be  pursued  by the  Initial  Recipient  (as  hereinafter  defined)  without
offering such Business  Opportunity to the other party. For purposes hereof, the
term "Initial  Recipient" shall mean the Snyder Entities or Patina Entities,  as
the  case  may be,  that  first  was  initially  contacted  by a third  party in
connection  with  such  Business  Opportunity;  provided,  however,  that if the
individual  that was  initially  contacted  in  connection  with  such  Business
Opportunity is an officer or director of one or more Snyder  Entities and one or
more Patina Entities,  then the characterization of the Business Opportunity for
purposes  of this  Agreement  shall  depend  solely  upon  which  capacity  such
individual  was serving in connection  with  receiving such third party contact;
provided  further  that if the  capacity  is not  specified,  then the  Business
Opportunity may be pursued by the Snyder Entities  without any  participation by
Patina.

     Section 3.  Patina  Business  Opportunities.  (a) Snyder  hereby  grants to
Patina  a  right  of  first  refusal  (the  "Patina  Option")  on  all  Business
Opportunities  primarily  involving  operations,   properties,  assets,  rights,
liabilities  and/or  obligations in or centered on the Wattenberg Field,  except
from the surface to the base of the Lyons  formation  in Sections 2, 3, 4, 9, 10
and 11 of Township 7 North, Range 67 West and Sections 33, 34 and 35 of Township
8  North,  Range  67  West  (the  "Patina  Area  of  Interest")  (each  Business
Opportunity  subject to a Patina  Option  hereinafter  referred  to as a "Patina
Business Opportunity"). Notwithstanding the foregoing, the term "Patina Business

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Opportunity" shall not include those Business Opportunities  primarily involving
the current operations,  properties,  assets, rights, liabilities,  obligations,
claims and  contracts  listed (or  required  to be listed) in Section 1.3 of the
Snyder Disclosure Schedule to the Merger Agreement.

     (b) Snyder shall notify Patina of any Patina Business  Opportunity a Snyder
Entity  desires to pursue,  and in  connection  with such  notice  Snyder  shall
furnish to Patina all information in its possession  regarding such  opportunity
that is material to Patina's  decision  regarding whether or not to exercise the
Patina Option.  Within 10 days of receipt of such notice and information (twenty
days in the event  Snyder  notifies  Patina  of more than one such  opportunity)
Patina shall notify Snyder as to whether  Patina will exercise the Patina Option
with regard to such opportunity,  unless such opportunity  reasonably requires a
shorter  response  time, in which case Snyder shall  describe the  circumstances
giving rise to the need for a shorter  response time in its notice to Patina and
Patina shall be required to respond within such shorter time period.

     (c) If Patina  notifies  Snyder of its intent to  exercise a Patina  Option
pursuant to subsection  (b) above then,  subject to the provisions of subsection
(d) below, a Patina Entity may pursue the relevant Patina  Business  Opportunity
to the  exclusion of the Snyder  Entities or may  otherwise  pursue the relevant
Patina  Business  Opportunity.  The Snyder  Entities shall refrain from pursuing
such  opportunity,  unless  and until  Patina  informs  Snyder  that the  Patina
Entities have ceased their efforts to pursue such opportunity.  Upon exercise of
the Patina Option, a Patina Entity that pursues a Patina Business Opportunity is
not required to do so on terms identical to those under which Snyder intended to
pursue such opportunity.

     (d) If Patina has given Snyder  notice of the intent of a Patina  Entity to
pursue a Patina Business  Opportunity  under subsection (c) above and the Patina
Entities fail to take Significant  Steps under the  circumstances to pursue such
opportunity  within a  reasonable  time of  delivering  such  notice  under  the
circumstances,  or if the Patina  Entities  cease to continue  with  Significant
Steps  to  pursue  such  opportunity  for  an  unreasonable   period  under  the
circumstances,  then  notwithstanding any other provision of this Section 3, the
Snyder  Entities  may pursue the relevant  Patina  Business  Opportunity  if (i)
Snyder  provides notice to Patina of its intent to do so and (ii) within 20 days
of such  notice  the  Patina  Entities  have  not  begun  or  continued  to take
Significant Steps to pursue such opportunity.

     Section 4.  Snyder  Business  Opportunities.  (a) Patina  hereby  grants to
Snyder  the  right  of first  refusal  (the  "Snyder  Option")  on all  Business
Opportunities  primarily  involving  operations,   properties,  assets,  rights,
liabilities and/or obligations in or centered in the areas described on Appendix
I attached  hereto (the "Snyder Area of Interest")  (each  Business  Opportunity
subject  to a  Snyder  Option  hereinafter  referred  to as a  "Snyder  Business
Opportunity").

     (b) Patina shall notify Snyder of any Snyder Business  Opportunity a Patina
Entity  desires to pursue,  and in  connection  with such  notice  Patina  shall
furnish to Snyder all information in its possession  regarding such  opportunity
that is material to Snyder's  decision  regarding whether or not to exercise the
Snyder Option.  Within 10 days of receipt of such notice and information (twenty
days in the  event  Patina  notifies  Snyder  of more  than  one  such  Business
Opportunity)  Snyder shall notify Patina as to whether  Snyder will exercise the
Snyder  Option  with  regard  to  such  opportunity,   unless  such  opportunity
reasonably requires a shorter response time, in which case Patina shall describe
the

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circumstances  giving rise to the need for a shorter response time in its notice
to Snyder and Snyder  shall be required  to respond  within  such  shorter  time
period.

     (c) If Snyder  notifies  Patina of its intent to  exercise a Snyder  Option
pursuant to subsection  (b) above then,  subject to the provisions of subsection
(d) below, a Snyder Entity may pursue the relevant Snyder  Business  Opportunity
to the  exclusion of the Patina  Entities or may  otherwise  pursue the relevant
Snyder  Business  Opportunity.  The Patina  Entities shall refrain from pursuing
such opportunity unless and until Snyder informs Patina that the Snyder Entities
have ceased  their  efforts to pursue  such  opportunity.  Upon  exercise of the
Snyder Option, a Snyder Entity that pursues a Snyder Business Opportunity is not
required to do so on terms  identical  to those under which  Patina  intended to
pursue such opportunity.

     (d) If Snyder  has  given  Patina  notice of its  intent to pursue a Snyder
Business  Opportunity under subsection (c) above and the Snyder Entities fail to
take Significant Steps under the circumstances to pursue such opportunity within
a reasonable time of delivering such notice under the  circumstances,  or if the
Snyder  Entities  cease  to  continue  with  Significant  Steps to  pursue  such
opportunity  for  an   unreasonable   period  under  the   circumstances,   then
notwithstanding  any other  provision  of this  Section 4, Patina may pursue the
relevant Snyder Business  Opportunity if (i) Patina provides notice to Snyder of
its intent to do so and (ii) within 20 days of such  notice the Snyder  Entities
have  not  begun  or  continued  to  take  Significant   Steps  to  pursue  such
opportunity.

     Section 5.  Other  Rights to  Purchase  by  Patina.  If any  Snyder  Entity
acquires  any  corporation,  trust,  partnership,   limited  liability  company,
division, or other group of assets that do not primarily involve the Patina Area
of Interest, but which involve operations,  properties, assets or rights located
in the Patina Area of Interest  (together  with any associated  liabilities  and
obligations,  the "Patina Area of Interest Assets"),  then Patina shall have the
right,  exercisable in the manner set forth herein, to acquire all, but not less
than all, of such Patina Area of Interest Assets.  Snyder shall notify Patina of
any Patina Area of Interest  Assets,  and such notice  Snyder  shall  furnish to
Patina all information in its possession  regarding such Patina Area of Interest
Assets  that is  material  to  Patina's  decision  regarding  whether  or not to
exercise  the option set forth in this  Section 5.  Within 10 days of receipt of
such notice and information  (twenty days in the event Snyder notifies Patina of
more than one such opportunity)  Patina shall notify Snyder as to whether Patina
will  exercise  such  option  with  regard  to  such  opportunity,  unless  such
opportunity  reasonably  requires a shorter  response time, in which case Snyder
shall describe the circumstances  giving rise to the need for a shorter response
time in its notice to Patina and Patina shall be required to respond within such
shorter time period.  If Patina  notifies  Snyder of its intent to exercise such
option pursuant to this Section 5, then the closing of such exercise shall occur
on a mutually agreeable date not more than 20 business days after the receipt of
the appraisal  described  below.  The purchase price,  which shall be payable in
immediately  available  funds,  shall be equal to the fair  market  value of the
Patina Area of Interest Assets. Such fair market value shall be determined by an
appraisal  performed  by an  investment  banking  firm or other  valuation  firm
experienced in valuing oil and gas properties (the  "Appraiser").  The Appraiser
shall be appointed by Snyder,  and must be reasonably  acceptable to Patina. The
fees and expenses of the Appraiser shall be paid one-half by Snyder and one-half
by Patina,  subject to the  provisions of the final  sentence of this Section 5.
The parties shall furnish such  information  to the Appraiser as shall be needed
to perform the appraisal  contemplated hereby. Such appraisal shall be completed
within 30 days after the  appointment  of the  Appraiser.  Patina may revoke its
election to

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purchase the Patina Area of Interest  Assets  within five days after the receipt
of the appraisal, provided that if Patina so elects to revoke, it shall pay 100%
of the fees and expenses of the Appraiser.

     Section 6.  Other  Rights to  Purchase  by  Snyder.  If any  Patina  Entity
acquires  any  corporation,  trust,  partnership,   limited  liability  company,
division, or other group of assets that do not primarily involve the Snyder Area
of Interest, but which involve operations,  properties, assets or rights located
in the  Snyder  Area  of  Interest  (together  any  associated  liabilities  and
obligations,  the "Snyder  Area of  Interest  Assets"),  then Snyder  shall have
right,  exercisable in the manner set forth herein, to acquire all, but not less
than all, of such Snyder Area of Interest Assets.  Patina shall notify Snyder of
any Snyder Area of Interest  Assets,  and such notice  Patina  shall  furnish to
Snyder all information in its possession  regarding such Snyder Area of Interest
Assets  that is  material  to  Snyder's  decision  regarding  whether  or not to
exercise  the option set forth in this  Section 6.  Within 10 days of receipt of
such notice and information  (twenty days in the event Patina notifies Snyder of
more than one such opportunity)  Snyder shall notify Patina as to whether Snyder
will  exercise  such  option  with  regard  to  such  opportunity,  unless  such
opportunity  reasonably  requires a shorter  response time, in which case Patina
shall describe the circumstances  giving rise to the need for a shorter response
time in its notice to Snyder and Snyder shall be required to respond within such
shorter time period.  If Snyder  notifies  Patina of its intent to exercise such
option pursuant to this Section 6, then the closing of such exercise shall occur
on a mutually agreeable date not more than 20 business days after the receipt of
the appraisal  described  below.  The purchase price,  which shall be payable in
immediately  available  funds,  shall be equal to the fair  market  value of the
Snyder Area of Interest Assets. Such fair market value shall be determined by an
appraisal performed by an Appraiser. The Appraiser shall be appointed by Patina,
and must be  reasonably  acceptable  to  Snyder.  The fees and  expenses  of the
Appraiser  shall be paid  one-half by Patina and one-half by Snyder,  subject to
the  provisions  of the final  sentence  of this  Section 5. The  parties  shall
furnish  such  information  to the  Appraiser  as shall be needed to perform the
appraisal  contemplated hereby. Such appraisal shall be completed within 30 days
after the  appointment  of the  Appraiser.  Snyder may revoke  its  election  to
purchase the Snyder Area of Interest  Assets  within five days after the receipt
of the appraisal, provided that if Snyder so elects to revoke, it shall pay 100%
of the fees and expenses of the Appraiser.

     Section 7. Arbitration.

     (a) Agreement to Arbitrate.  Any and all claims, demands, causes of action,
disputes, controversies and other matters in question arising out of or relating
to any provision of this  Agreement or the alleged  breach  thereof  ("Claims"),
including claims that are allegedly  extra-contractual  in nature,  whether such
Claims are based in  contract,  tort or  otherwise,  at law or in equity,  under
state or federal law, whether provided by statute or the common law, for damages
or any other  relief,  shall be  resolved  and  decided  exclusively  by binding
arbitration  pursuant  to the Federal  Arbitration  Act in  accordance  with the
Commercial  Arbitration  Rules of the American  Arbitration  Association then in
effect and the provisions of this section.

     (b) Procedural  Matters.  The arbitration  proceeding shall be conducted in
Denver,  Colorado. The arbitration shall be before a panel of three arbitrators.
Each party to such dispute shall select one arbitrator  and the two  arbitrators
selected  by the  parties  shall  select  the  third  arbitrator  (together  the
"Arbitrators").   The   Arbitrators   are  authorized  to  issue  subpoenas  for
depositions and

                                                      -5-


other discovery mechanisms,  as well as trial subpoenas,  in accordance with the
Federal  Rules of Civil  Procedure.  Any party may initiate a proceeding  in the
appropriate  United States District Court to enforce the provisions of the prior
sentence.  This agreement to arbitrate shall be enforceable in either federal or
state court.  Judgment upon any award rendered in any arbitration  hereunder may
be entered by any federal or state court having jurisdiction. The enforcement of
this  agreement  to  arbitrate  and all  procedural  aspects  of an  arbitration
hereunder,  including without  limitation the construction and interpretation of
this agreement to arbitrate, the scope of the arbitrable issues,  allegations of
waiver, delay or defenses to arbitrability,  and the rules governing the conduct
of the arbitration,  shall be governed by and construed  pursuant to the Federal
Arbitration Act.

     (c)  Remedies;  Amounts  Awarded.  The  Arbitrators  may grant such  relief
(including,  without limitation,  injunctive relief and specific performance) as
may  be  consistent  with  the  provisions  of  this  Agreement  and  which  the
Arbitrators deem appropriate except that, while the Arbitrators may award actual
damages to a party,  they shall have no  authority  under any  circumstances  to
award punitive  (including,  without limitation,  any exemplary damages,  treble
damages or any other sort of penalty or punitive type  damages),  consequential,
incidental or indirect damages (in tort, contract or otherwise).

     (d)  Costs.  The  Arbitrators  shall  be  entitled  to  award  costs of the
arbitration  and  reasonable  fees and expenses of attorneys as the  Arbitrators
deem appropriate.
 
     Section 8. Miscellaneous.

     (a)  Contracts  and  Agreements.  Neither  party shall from the date hereof
enter into any contracts or agreements  that will prevent it from performing its
duties and  obligations  under this  Agreement or prevent the other party hereto
from realizing the benefits of this Agreement.

     (b) Third Party  Beneficiaries.  This  Agreement  is also  intended for the
benefit of each Patina Entity,  each Snyder Entity,  and members of the Board of
Directors of Patina, each Patina Entity,  Snyder and each Snyder Entity, each of
which shall be considered a third party beneficiary of this Agreement.

     (c)  Confidentiality.  The provisions of this  Agreement,  all  information
regarding  Business  Opportunities  and all other  information  exchanged by the
parties under this  Agreement  (collectively,  the  "Information")  shall not be
disclosed by any party to this Agreement unless otherwise publicly disclosed and
except as otherwise  required by law. Each of Patina and Snyder may disclose the
Information  on a need to know basis to its  employees and agents but shall take
steps to ensure that such  employees  and agents,  and the Patina  Entities  and
Snyder Entities, abide by the confidentiality provisions of this Section 8(c).

     (d) Amendment;  Waivers;  Termination.  This Agreement may only be altered,
supplemented,  amended or waived by the  written  consent of each party  hereto.
This Agreement shall terminate upon the mutual  agreement by the parties hereto;
provided, however, that the provisions of Sections 3, 4, 5 and 6 shall terminate
on the third  anniversary  of the  Effective  Time.  Any action  taken by Patina
pursuant to this  Agreement  (including  without  limitation any action taken by
Patina

                                                      -6-


in connection with any alteration, supplement, amendment, waiver or termination)
shall be  approved  in the  manner  set  forth  in  Section  7.22 of the  Merger
Agreement.

     (e)  Assignment.  The terms and conditions of this Agreement shall inure to
the  benefit  of and be binding  upon the  parties  hereto  and their  permitted
successors and assigns;  provided,  however, that no party hereto shall have the
right to assign this Agreement without the consent of the other party hereto.

     (f)  Notices.  Any  and  all  notices,   designations,   consents,  offers,
acceptances, or other communications provided for herein (each a "Notice") shall
be given in writing by personal delivery,  overnight courier, certified mail, or
telecopy  addressed,  or sent, to the following  addresses or telecopy  numbers,
except as either party  hereto may  otherwise  specify in writing in  accordance
with this Section 8(f):

If to Patina to:

                  Patina Oil & Gas Corporation
                  1625 Broadway
                  Denver, Colorado 80202
                  Attention:  Rodney L. Waller
                  Telecopy No.: (303) 592-8600

If to Snyder to:

                  Snyder Oil Corporation
                  777 Main Street, Suite 2500
                  Fort Worth, Texas 76012
                  Attention: General Counsel
                  Telecopy No.: (817) 882-5982

Any Notice  hereunder shall be deemed  effective,  delivered and received (a) if
given by personal  delivery,  when such Notice is  personally  delivered  at the
address  specified  above;  (b) if given by  telecopy,  when  such  telecopy  is
transmitted  to the  telecopy  number  specified  above and  receipt  thereof is
confirmed;  (c) if given by overnight  courier,  on the business day immediately
following  the day on which such Notice is  delivered  to a reputable  overnight
courier  service;  or (d) if  given by  certified  mail,  when  such  Notice  is
delivered at the address specified above.

     (g)   Counterparts.   This  Agreement  may  be  executed  in  two  or  more
counterparts,  each of  which  shall  be  deemed  to be an  original  and  which
counterparts together shall constitute one and the same agreement of the parties
hereto.

     (h) Choice of Law. This Agreement shall be governed by the internal laws of
the State of Delaware  without  giving  effect to the  principles of conflict of
laws thereof.


                                                      -7-


     (i) Entire Agreement.  This Agreement contains the entire  understanding of
the parties hereto respecting the subject matter hereof and supersedes all prior
agreements, discussions and understandings with respect thereto.

     (j) No  Partnership.  No  term or  provision  of this  Agreement  shall  be
construed to establish any relationship of partnership,  agency or joint venture
among the parties hereto.

     (k)  Severability.  In the  event  that  any one or more of the  provisions
contained  in this  Agreement  is,  for any  reason,  held  invalid,  illegal or
unenforceable in any respect,  such invalidity,  illegality or  unenforceability
shall not affect any other provision of this Agreement.

     IN WITNESS  WHEREOF,  the parties hereto have executed this Agreement as of
the date first listed above.

                                                   PATINA OIL & GAS CORPORATION.



                                                         By:  \s\  Rodney Waller
                                                                   Rodney Waller
                                                                  Vice President


                                                          SNYDER OIL CORPORATION



                                                       By: \s\ Thomas J. Edelman
                                                               Thomas J. Edelman
                                                                       President





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