| 491310 | Jan 24, 2000 | Jan 24, 2000 | Houston Exploration Company, The | Zapata | Asche #45 | 10,700 | 50534073 |
| 491308 | Jan 24, 2000 | Jan 24, 2000 | Houston Exploration Company, The | Zapata | Garza, A. #12 | 10,700 | 50534072 |
| 490649 | Dec 23, 1999 | Dec 23, 1999 | Houston Exploration Company, The | Zapata | Garza, A. #11 | 11,000 | 50534061 |
| 490648 | Dec 23, 1999 | Dec 23, 1999 | Houston Exploration Company, The | Zapata | Daisy #4 | 14,700 | 50534062 |
| 489589 | Nov 17, 1999 | Nov 17, 1999 | Houston Exploration Company, The | Zapata | Alfonso #12 | 10,320 | 50534039 |
| 489588 | Nov 17, 1999 | Nov 17, 1999 | Houston Exploration Company, The | Zapata | Asche #44 | 10,700 | 50534040 |
| 488831 | Nov 3, 1999 | Nov 3, 1999 | Houston Exploration Company, The | Gregg | Tolar, Joe #2 | 7,800 | 18330776 |
| 488528 | Oct 15, 1999 | Oct 15, 1999 | Houston Exploration Company, The | Zapata | J. O. D. #11 | 12,000 | 50534021 |
| 488527 | Oct 15, 1999 | Oct 15, 1999 | Houston Exploration Company, The | Zapata | J. O. D. #10 | 14,500 | 50534020 |
| 487159 | Sep 2, 1999 | Sep 2, 1999 | Houston Exploration Company, The | Zapata | Garza, L. Estate of et Al #3 | 14,500 | 50533995 |
| 487158 | Sep 2, 1999 | Sep 2, 1999 | Houston Exploration Company, The | Zapata | Alfonso #11 | 10,370 | 50533996 |
| 487157 | Sep 2, 1999 | Sep 2, 1999 | Houston Exploration Company, The | Zapata | Garza, A. #10 | 10,500 | 50533997 |
| 487157Amendment | Sep 2, 1999 | Sep 2, 1999 | Houston Exploration Company, The | Zapata | Garza, A. #10 | 10,500 | 50533997 |
| 486585 | Aug 17, 1999 | Aug 17, 1999 | Houston Exploration Company, The | Zapata | Flores, L. G. #21 | 14,000 | 50533794 |
| 485589 | Jul 2, 1999 | Jul 2, 1999 | Houston Exploration Company, The | Zapata | J.O.D. #9 | 14,800 | 50533962 |
| 485589Amendment | Jul 2, 1999 | Jul 2, 1999 | Houston Exploration Company, The | Zapata | J.O.D. #9 | 14,800 | 50533962 |
| 485490 | Jun 29, 1999 | Jun 29, 1999 | Houston Exploration Company, The | Zapata | Flores, L. G. #23 | 11,800 | 50533960 |
| 485490Amendment | Jun 29, 1999 | Jun 29, 1999 | Houston Exploration Company, The | Zapata | Flores, L. G. #23 | 11,800 | 50533960 |
| 485489 | Jun 29, 1999 | Jun 29, 1999 | Houston Exploration Company, The | Zapata | Asche #43 | 12,000 | 50533961 |
| 485489Amendment | Jun 29, 1999 | Jun 29, 1999 | Houston Exploration Company, The | Zapata | Asche #43 | 12,000 | 50533961 |
| 484573 | May 18, 1999 | May 18, 1999 | Houston Exploration Company, The | Zapata | Asche #42 | 13,800 | 50533945 |
| 484572 | May 18, 1999 | May 18, 1999 | Houston Exploration Company, The | Zapata | Gutierrez, J. M. #9 | 10,800 | 50533942 |
| 484571 | May 18, 1999 | May 18, 1999 | Houston Exploration Company, The | Zapata | Garza, L. Estate of et Al #2 | 14,700 | 50533944 |
| 484570 | May 18, 1999 | May 18, 1999 | Houston Exploration Company, The | Zapata | Porras Gas Unit #5 | 10,800 | 50533943 |
| 484137 | Apr 27, 1999 | Apr 27, 1999 | Houston Exploration Company, The | Navarro | Henderson, Clarence F. #1 | 11,520 | 34934600 |
| 483912 | Apr 19, 1999 | Apr 19, 1999 | Houston Exploration Company, The | Zapata | Alfonso #10 | 11,000 | 50533930 |
| 483911 | Apr 19, 1999 | Apr 19, 1999 | Houston Exploration Company, The | Zapata | Flores, L. G. #22 | 11,800 | 50533929 |
| 483911Amendment | Apr 19, 1999 | Apr 19, 1999 | Houston Exploration Company, The | Zapata | Flores, L. G. #22 | 14,500 | 50533929 |
| 483910 | Apr 19, 1999 | Apr 19, 1999 | Houston Exploration Company, The | Zapata | Asche #41 | 12,000 | 50533928 |
| 483442 | Mar 23, 1999 | Mar 23, 1999 | Houston Exploration Company, The | Zapata | Garza, L. et Al #1 | 14,500 | 50533917 |
| 483110 | Mar 10, 1999 | Mar 10, 1999 | Houston Exploration Company, The | Mustang IS-LB | S. T. 842-L SE/4 #1 | 15,000 | 70230248 |
| 482789 | Feb 22, 1999 | Feb 22, 1999 | Houston Exploration Company, The | Zapata | Flores, L. G. #17R | 14,000 | 50533242 |
| 482552 | Feb 10, 1999 | Feb 10, 1999 | Houston Exploration Company, The | Zapata | Ramirez, Ramiro #1 | 11,200 | 50533899 |
| 482551 | Feb 10, 1999 | Feb 10, 1999 | Houston Exploration Company, The | Zapata | J. O. D. #8 | 12,000 | 50533900 |
| 482550 | Feb 10, 1999 | Feb 10, 1999 | Houston Exploration Company, The | Zapata | Jacoba #4 | 14,500 | 50533901 |
| 479970 | Nov 5, 1998 | Nov 5, 1998 | Houston Exploration Company, The | Zapata | Garza-Irene Gas Unit #1 | 14,500 | 50533814 |
| 480454 | Oct 26, 1998 | Oct 26, 1998 | Houston Exploration Company, The | Navarro | Grantham Heirs #2 | 8,000 | 34934597 |
| 480453 | Oct 26, 1998 | Oct 26, 1998 | Houston Exploration Company, The | Navarro | Granthan Heirs #1 | 8,000 | 34934596 |
| 480197 | Oct 16, 1998 | Oct 16, 1998 | Houston Exploration Company, The | Zapata | Asche #40 | 11,700 | 50533864 |
| 480196 | Oct 16, 1998 | Oct 16, 1998 | Houston Exploration Company, The | Zapata | Yzaguirre-Leo Gas Unit #9 | 11,500 | 50533865 |
| 480195 | Oct 16, 1998 | Oct 16, 1998 | Houston Exploration Company, The | Zapata | Garza, A. #9 | 10,500 | 50533866 |
| 479969 | Oct 13, 1998 | Oct 13, 1998 | Houston Exploration Company, The | Zapata | Asche #39 | 13,500 | 50533755 |
| 479734 | Sep 29, 1998 | Sep 29, 1998 | Houston Exploration Company, The | Zapata | Leonardo #20 | 10,200 | 50533860 |
| 479461 | Sep 16, 1998 | Sep 16, 1998 | Houston Exploration Company, The | Zapata | Yzaguirre-Leo Gas Unit #8 | 11,700 | 50533856 |
| 478946 | Aug 31, 1998 | Aug 31, 1998 | Houston Exploration Company, The | Zapata | Garza, A. #2 | 10,531 | 50531502 |
| 478946Amendment | Aug 31, 1998 | Aug 31, 1998 | Houston Exploration Company, The | Zapata | Garza, A. #2 | 10,531 | 50531502 |
| 478994 | Aug 26, 1998 | Aug 26, 1998 | Houston Exploration Company, The | Zapata | Porras Gas Unit #4 | 11,700 | 50533849 |
| 478994Amendment | Aug 26, 1998 | Aug 26, 1998 | Houston Exploration Company, The | Zapata | Porras Gas Unit #4 | 11,700 | 50533849 |
| 478993 | Aug 26, 1998 | Aug 26, 1998 | Houston Exploration Company, The | Zapata | J. O. D. #7 | 11,700 | 50533850 |
| 478993Amendment | Aug 26, 1998 | Aug 26, 1998 | Houston Exploration Company, The | Zapata | J. O. D. #7 | 12,000 | 50533850 |
| 478607 | Aug 10, 1998 | Aug 10, 1998 | Houston Exploration Company, The | Zapata | Ramirez, Abel #4 | 9,500 | 50533844 |
| 478464 | Aug 4, 1998 | Aug 4, 1998 | Houston Exploration Company, The | Mustang IS-SB | St. 990-S S/2 #1 | 10,000 | 60230179 |
| 477762 | Jul 8, 1998 | Jul 8, 1998 | Houston Exploration Company, The | Zapata | Garza, L. "B-5" #5 | 10,700 | 50533826 |
| 477761 | Jul 8, 1998 | Jul 8, 1998 | Houston Exploration Company, The | Zapata | Araceli Gas Unit #1 | 11,700 | 50533825 |
| 477666 | Jul 2, 1998 | Jul 2, 1998 | Houston Exploration Company, The | Zapata | Yzaguirre-Leo Gas Unit #7 | 11,900 | 50533822 |
| 476983 | Jun 25, 1998 | Jun 25, 1998 | Houston Exploration Company, The | Zapata | Garza, A. #8 | 10,500 | 50533754 |
| 477378 | Jun 23, 1998 | Jun 23, 1998 | Houston Exploration Company, The | Zapata | Gutierrez, E. E. #4 | 11,700 | 50533820 |
| 477322 | Jun 22, 1998 | Jun 22, 1998 | Houston Exploration Company, The | Mustang IS-LB | S.T. 862-L N/2 SE/4 #1 | 13,000 | 70230246 |
| 476856 | Jun 4, 1998 | Jun 4, 1998 | Houston Exploration Company, The | Zapata | Garza-Irene Gas Unit #1 | 14,500 | 50533814 |
| 475518 | Apr 22, 1998 | Apr 22, 1998 | Houston Exploration Company, The | Zapata | J.O.D. #6 | 11,700 | 50533795 |
| 475513 | Apr 22, 1998 | Apr 22, 1998 | Houston Exploration Company, The | Zapata | Flores, L. G. #21 | 14,000 | 50533794 |
| 475094 | Apr 7, 1998 | Apr 7, 1998 | Houston Exploration Company, The | Zapata | Alfonso #9 | 11,000 | 50533788 |
| 475093 | Apr 7, 1998 | Apr 7, 1998 | Houston Exploration Company, The | Zapata | Flores, L. G. #20 | 11,700 | 50533787 |
| 473273 | Feb 12, 1998 | Feb 12, 1998 | Houston Exploration Company, The | Zapata | Leonardo #19 | 10,500 | 50533757 |
| 473272 | Feb 12, 1998 | Feb 12, 1998 | Houston Exploration Company, The | Zapata | Garza, A. #8 | 10,500 | 50533754 |
| 473271 | Feb 12, 1998 | Feb 12, 1998 | Houston Exploration Company, The | Zapata | Asche #39 | 13,500 | 50533755 |
| 472788 | Jan 30, 1998 | Jan 30, 1998 | Houston Exploration Company, The | Zapata | Flores, L. G. #11 | 14,038 | 50532997 |
| 472595 | Jan 26, 1998 | Jan 26, 1998 | Houston Exploration Company, The | Zapata | Flores, L. G. #19 | 11,700 | 50533751 |
| 472221 | Jan 15, 1998 | Jan 15, 1998 | Houston Exploration Company, The | Zapata | Asche #38 | 11,500 | 50533743 |
| 469953 | Nov 12, 1997 | Nov 12, 1997 | Houston Exploration Company, The | Zapata | Gutierrez, J. M. #8 | 10,400 | 50533708 |
| 469952 | Nov 12, 1997 | Nov 12, 1997 | Houston Exploration Company, The | Zapata | Leonardo #18 | 10,400 | 50533707 |
| 469951 | Nov 12, 1997 | Nov 12, 1997 | Houston Exploration Company, The | Zapata | Leonardo #17 | 10,400 | 50533706 |
| 469950 | Nov 12, 1997 | Nov 12, 1997 | Houston Exploration Company, The | Zapata | Leonardo #16 | 10,500 | 50533705 |
| 468887 | Oct 16, 1997 | Oct 16, 1997 | Houston Exploration Company, The | Zapata | Asche #36 | 11,300 | 50533692 |
| 468886 | Oct 16, 1997 | Oct 16, 1997 | Houston Exploration Company, The | Zapata | Asche #37 | 10,500 | 50533693 |
| 466888 | Sep 10, 1997 | Sep 10, 1997 | Houston Exploration Company, The | Zapata | Asche #29 | 10,500 | 50533563 |
| 467257 | Sep 8, 1997 | Sep 8, 1997 | Houston Exploration Company, The | Zapata | Leonardo #15 | 10,500 | 50533677 |
| 467256 | Sep 8, 1997 | Sep 8, 1997 | Houston Exploration Company, The | Zapata | Asche #35 | 10,500 | 50533676 |
| 466755 | Aug 26, 1997 | Aug 26, 1997 | Houston Exploration Company, The | Zapata | Garza, A. #7 | 10,500 | 50533667 |
| 464812 | Jul 11, 1997 | Jul 11, 1997 | Houston Exploration Company, The | Zapata | R.M.T. #6 | 10,000 | 50533651 |
| 464811 | Jul 11, 1997 | Jul 11, 1997 | Houston Exploration Company, The | Zapata | Asche #33 | 10,500 | 50533650 |
| 464811Amendment | Jul 11, 1997 | Jul 11, 1997 | Houston Exploration Company, The | Zapata | Asche #33 | 10,500 | 50533650 |
| 464810 | Jul 11, 1997 | Jul 11, 1997 | Houston Exploration Company, The | Zapata | Asche #34 | 10,500 | 50533649 |
| 464809 | Jul 11, 1997 | Jul 11, 1997 | Houston Exploration Company, The | Zapata | R.M.T. #5 | 10,000 | 50533648 |
| 464808 | Jul 11, 1997 | Jul 11, 1997 | Houston Exploration Company, The | Zapata | Leonardo #14 | 10,500 | 50533647 |
| 464807 | Jul 11, 1997 | Jul 11, 1997 | Houston Exploration Company, The | Zapata | Leonardo #13 | 10,500 | 50533646 |
| 463988 | Jun 20, 1997 | Jun 20, 1997 | Houston Exploration Company, The | Zapata | Asche #32 | 13,000 | 50533634 |
| 463987 | Jun 20, 1997 | Jun 20, 1997 | Houston Exploration Company, The | Zapata | Garza, A. #6 | 10,500 | 50533633 |
| 462507 | May 19, 1997 | May 19, 1997 | Houston Exploration Company, The | Zapata | Asche #30 | 10,500 | 50533612 |
| 462506 | May 19, 1997 | May 19, 1997 | Houston Exploration Company, The | Zapata | Asche #31 | 10,500 | 50533613 |
| 461547 | Apr 25, 1997 | Apr 25, 1997 | Houston Exploration Company, The | Zapata | Flores, M. #5 | 9,800 | 50533593 |
| 461546 | Apr 25, 1997 | Apr 25, 1997 | Houston Exploration Company, The | Zapata | Ramirez, Abel #3 | 9,400 | 50533594 |
| 460191 | Mar 25, 1997 | Mar 25, 1997 | Houston Exploration Company, The | Zapata | R.M.T. #4 | 10,500 | 50533578 |
| 459641 | Mar 10, 1997 | Mar 10, 1997 | Houston Exploration Company, The | Zapata | Flores, M. #4 | 10,000 | 50533574 |
| 459045 | Feb 24, 1997 | Feb 24, 1997 | Houston Exploration Company, The | Zapata | Asche #29 | 10,500 | 50533563 |
| 458486 | Feb 10, 1997 | Feb 10, 1997 | Houston Exploration Company, The | Zapata | Porras Gas Unit #3 | 10,400 | 50533556 |
| 458485 | Feb 10, 1997 | Feb 10, 1997 | Houston Exploration Company, The | Zapata | Diamantina #1 | 10,000 | 50533557 |
| 458485Amendment | Feb 10, 1997 | Feb 10, 1997 | Houston Exploration Company, The | Zapata | Diamantina #1 | 10,000 | 50533557 |
| 457269 | Jan 10, 1997 | Jan 10, 1997 | Houston Exploration Company, The | Zapata | Ramirez, Abel #2 | 9,500 | 50533537 |
| 457269Amendment | Jan 10, 1997 | Jan 10, 1997 | Houston Exploration Company, The | Zapata | Ramirez, Abel #2 | 9,500 | 50533537 |