AGREEMENT The undersigned reporting persons hereby agree that the statements filed pursuant to this Schedule 13D, to which this Agreement is filed as an exhibit, are filed on behalf of each of them. Date: September 7, 1999 3TEC ENERGY CORPORATION

   1

                                                                    EXHIBIT 99.1


                                    AGREEMENT

         The undersigned reporting persons hereby agree that the statements
filed pursuant to this Schedule 13D, to which this Agreement is filed as an
exhibit, are filed on behalf of each of them.

Date: September 7, 1999                    3TEC ENERGY CORPORATION



                                           By:   /s/   Xxxxx Xxxxxx
                                                 ------------------------------
                                                 Xxxxx Xxxxxx
                                                 Managing Director


Date: September 7, 1999                    ENCAP INVESTMENTS L.L.C.



                                           By:   /s/   D. Xxxxxx Xxxxxxxx
                                                 ------------------------------
                                                 D. Xxxxxx Xxxxxxxx
                                                 Managing Director