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                                                                     EXHIBIT 4.3

November 19, 1998

VIA FACSIMILE: 212/262-0596

Joseph M. Rinaldi
Stratum Corp.
1330 Sixth Avenue, 33rd Floor
New York, NY 10019

Re:   Stratum Group Energy Partners, L.P. Loan to
      Venus Development, Inc.
      Settlement of all Obligations


Dear Joe:

Here are the terms of the proposed settlement of all obligations of the Venus
companies and of the former Venus Energy Plc shareholders to the Stratum
companies that arose out of the Term Loan and Security Master Agreement between
Venus Development, Inc., and Stratum Group Energy Partners, L.P. dated October
8, 1996, and the other agreements executed concurrently with that agreement.

In return for a full and final release from those obligations from all of the
Stratum entities and their assigns and for a reassignment to Venus Development,
Inc., or its designee of all real and personal property interests conveyed, or
agreed to be conveyed, to any of the Stratum entities, Venus Exploration, Inc.,
will issue Stratum Corp. or its designee ("Stratum") One Million One Hundred
Thousand (1,100,000) shares of its Common Stock, par value $0.01.

Those securities will be issued without registration under the Securities Act of
1933 and will be restricted securities. As a condition of the settlement offer,
Stratum must agree that:

         i) those securities will be acquired for its own account, for
         investment purposes only, and without any intent to distribute the
         shares; provided, however, that subject to compliance with applicable
         securities laws, Stratum may transfer said shares to Stratum's existing
         partners as a dividend or other similar distribution to partners;


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Mr. Joseph M. Rinaldi
November 19, 1998
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         ii) none of the Venus entities is making any representations or
         warranties with regard to the shares or the companies' businesses; and

         iii) Stratum is relying solely on the representations and statements
         made by Venus Exploration, Inc., in its publicly-filed reports made
         under the Securities Exchange Act of 1934.


The effective date of the settlement is November 12, 1998, and in addition to
the return and cancellation of the promissory note, the documents that are
required to complete the settlement transaction include, without limitation, the
following:

         a)       Reassignment to Venus Development, Inc., of all overriding 
                  royalty interests assigned to Stratum Group Energy Partners,
                  L.P.;

         b)       Cancellation of Hydrocarbon Purchase and Sale Option
                  Agreements

         c)       Release of Mortgage and Deed of Trust

         d)       Mutual releases by Stratum and the Venus companies of all
                  claims, causes of action and other liabilities against the
                  other under or related to the Term Loan and Security Master
                  Agreement and any related documents and/or transactions

         e)       UCC-3's for all states and counties

         f)       Letters in Lieu of Transfer Orders

         g)       Release of Assignment of Proceeds

         h)       Termination of Swap Agreements



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Mr. Joseph M. Rinaldi
November 19, 1998
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         i)       Assignment of Amended and Restated Equity Conversion Agreement
                  dated May 21, 1997, between The New Venus Exploration, Inc.,
                  and Stratum Group, L.P.

         j)       Assignment of Rights under Escrow Agreement dated May 21,
                  1997, among Frost National Bank, Stratum Group, L.P., The New
                  Venus Exploration, Inc., and Venus Oil Company

         k)       Cancellation of Stock Pledge and Security Agreement

         l)       Termination of Energy Risk Management Association Master
                  Energy Price Swap Agreement

         m)       Various filings and agreements necessary for compliance with
                  state and federal securities laws and regulations

         n)       Registration Rights Agreement containing customary terms and
                  conditions and including the following terms:

                  (i)      Venus Exploration, Inc. will file a registration
                           statement covering the resale of the shares within 90
                           days following the consummation of the transaction
                           contemplated hereby and will use its reasonable best
                           efforts to cause the SEC to declare such registration
                           statement effective.

                  (ii)     The Registration Rights Agreement will contain
                           provisions prohibiting sales of shares during certain
                           "blackout" periods as required by any underwriter
                           that Venus Exploration, Inc., may engage with regard
                           to any debt or equity transaction under
                           consideration. Those blackout periods will apply to
                           Stratum only if they also apply and are enforced
                           against the directors of Venus Exploration, Inc., and
                           its large shareholders; e.g., Range Resources
                           Corporation.



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Mr. Joseph M. Rinaldi
November 19, 1998
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                  (iii)    Venus Exploration, Inc., will advise Stratum by
                           written notice at least two weeks prior to the filing
                           of any registration statement under the Securities
                           Act of 1933 that covers its Common Stock and, upon
                           Stratum's request, will include in any such
                           registration statement such information as may be
                           required to permit a public offering of these
                           settlement shares. If, in the good faith judgment of
                           the managing underwriter of such public offering, the
                           inclusion of all of the settlement shares covered by
                           a request for registration would reduce the number of
                           shares to be offered by Venus Exploration, Inc., or
                           would interfere with the successful marketing of the
                           shares of stock offered by Venus Exploration, Inc.,
                           the number of settlement shares otherwise to be
                           included in the underwritten public offering may be
                           reduced or may be excluded in their entirety if so
                           required by the underwriter, provided that such
                           reduction will be not greater than, on a proportional
                           basis, the reduction experienced by the directors of
                           Venus Exploration, Inc., and its large shareholders;
                           e.g., Range Resources Corporation. If only a portion
                           of the settlement shares is included in the
                           underwritten public offering, those settlement shares
                           that are thus excluded from the underwritten public
                           offering shall be withheld from the market by Stratum
                           for the period that the managing underwriter
                           reasonably determines is necessary in order to effect
                           the underwritten public offering. Stratum will be
                           required to withhold those shares from the market
                           only to the extent that the directors of Venus
                           Exploration, Inc., and its large shareholders; e.g.,
                           Range Resources Corporation, are equally affected, on
                           a proportional basis, by such direction to withhold.
                           Furthermore, if the managing underwriter requires a
                           shorter withholding period for the directors of Venus
                           Exploration, Inc., and its large shareholders, that
                           shorter period will also apply to Stratum.


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Mr. Joseph M. Rinaldi
November 19, 1998
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                           Venus Exploration, Inc., will bear the entire cost
                           and expense of any registration of securities
                           initiated by it under Subsection (n)(iii)
                           notwithstanding that the settlement shares may be
                           included in any such registration. Stratum will,
                           however, bear the fees of its own counsel and any
                           registration fees, transfer taxes or underwriting
                           discounts or commissions applicable to the settlement
                           shares.

                  (iv)     If Stratum and its affiliates beneficially own less
                           than 5% of the outstanding shares of Common Stock of
                           Venus Exploration, Inc., the blackout period and
                           withhold-from-market requirements described in
                           Subsection (n)(ii) and Subsection (n)(iii) will be
                           waived by Venus Exploration, Inc.

It is agreed that Stratum and all of its affiliates and assigns will reassign to
Venus Development, Inc., or its designee all rights and property acquired as a
result of the Term Loan and Security Master Agreement, and nothing will be
retained by Stratum, its affiliates or assigns, provided that Stratum will
retain the rights to indemnification to which it is entitled under Section 10.5
of the Term Loan and Security Master Agreement.

If you agree with this settlement offer on the terms included, please
countersign this letter in the space provided below and return a copy to me as
evidence of your acceptance. Upon that acceptance, we will begin drafting the
various releases, assignments and other instruments necessary to document the
agreement. Unless such releases, assignments and other instruments are fully
executed and delivered on or before November 30, 1998, this settlement will be
of no force and effect, and the Venus companies and Stratum will be restored to
their respective positions that they occupied prior to this settlement.

This settlement offer will expire on November 19, 1998, at 5:00 P.M., Central
Standard Time, and may be withdrawn at any time before receipt of your
acceptance as required above.



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Mr. Joseph M. Rinaldi
November 19, 1998
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Very truly yours,

/s/ JOHN Y. AMES

John Y. Ames
President &
Chief Operating Officer


AGREED AND ACCEPTED:

STRATUM GROUP ENERGY PARTNERS, L.P.,
for itself and its affiliates

By:  STRATUM CORP., its general partner


By:  /s/ JOSEPH M. RINALDI
     ----------------------------------
     Joseph M. Rinaldi, President & CEO