| 474950 | Apr 6, 1998 | Apr 6, 1998 | Sanchez-O'Brien Oil & Gas Corp. | Starr | Orive, A. #7 | 5,300 | 42732660 |
| 474982 | Apr 2, 1998 | Apr 2, 1998 | Sanchez-O'Brien Oil & Gas Corp. | Yoakum | Kleiner #1 | 10,600 | 50134340 |
| 474982Amendment | Apr 2, 1998 | Apr 2, 1998 | Sanchez-O'Brien Oil & Gas Corp. | Yoakum | Kleiner #1 | 10,600 | 50134340 |
| 474981 | Apr 2, 1998 | Apr 2, 1998 | Sanchez-O'Brien Oil & Gas Corp. | Zapata | Benavides Trust #1 | 11,240 | 50533637 |
| 474857 | Mar 31, 1998 | Mar 31, 1998 | Sanchez-O'Brien Oil & Gas Corp. | Glasscock | Hillger, Bert Etal #2 | 8,500 | 17332882 |
| 471701 | Dec 29, 1997 | Dec 29, 1997 | Sanchez-O'Brien Oil & Gas Corp. | Starr | State of Texas #1 | 15,500 | 42733070 |
| 470078 | Nov 13, 1997 | Nov 13, 1997 | Sanchez-O'Brien Oil & Gas Corp. | Duval | Cuellar 123 #1 | 4,500 | 13138222 |
| 470078Amendment | Nov 13, 1997 | Nov 13, 1997 | Sanchez-O'Brien Oil & Gas Corp. | Duval | Cuellar 123 #1 | 3,700 | 13138222 |
| 470039 | Nov 12, 1997 | Nov 12, 1997 | Sanchez-O'Brien Oil & Gas Corp. | Hidalgo | Coates #1R | 8,600 | 21532027 |
| 468370 | Oct 2, 1997 | Oct 2, 1997 | Sanchez-O'Brien Oil & Gas Corp. | Live Oak | Bodden-Frost GU 1 #4 | 14,500 | 29734283 |
| 467619 | Sep 15, 1997 | Sep 15, 1997 | Sanchez-O'Brien Oil & Gas Corp. | Willacy | J. W. Wilson GU #1 | 13,000 | 48931000 |
| 467375 | Sep 9, 1997 | Sep 9, 1997 | Sanchez-O'Brien Oil & Gas Corp. | Newton | Greer Unit #1 | 9,100 | 35130685 |
| 466786 | Aug 26, 1997 | Aug 26, 1997 | Sanchez-O'Brien Oil & Gas Corp. | San Patricio | Wpog State GU #1 | 6,800 | 40932503 |
| 466786Amendment | Aug 26, 1997 | Aug 26, 1997 | Sanchez-O'Brien Oil & Gas Corp. | San Patricio | Wpog State GU #1 | 6,800 | 40932503 |
| 466222 | Aug 13, 1997 | Aug 13, 1997 | Sanchez-O'Brien Oil & Gas Corp. | San Patricio | Wpog State GU #1 | 8,800 | 40932503 |
| 464796 | Jul 17, 1997 | Jul 17, 1997 | Sanchez-O'Brien Oil & Gas Corp. | Willacy | Garcia, J. A. #1 | 13,500 | 48930997 |
| 466224 | Jul 2, 1997 | Jul 2, 1997 | Sanchez-O'Brien Oil & Gas Corp. | San Patricio | Wpog State GU #1 | 8,800 | 40932503 |
| 466224Amendment | Jul 2, 1997 | Jul 2, 1997 | Sanchez-O'Brien Oil & Gas Corp. | San Patricio | Wpog State GU #1 | 8,800 | 40932503 |
| 464209 | Jun 24, 1997 | Jun 24, 1997 | Sanchez-O'Brien Oil & Gas Corp. | Zapata | Benavides Trust #1 | 15,500 | 50533637 |
| 464209Amendment | Jun 24, 1997 | Jun 24, 1997 | Sanchez-O'Brien Oil & Gas Corp. | Zapata | Benavides Trust #1 | 13,939 | 50533637 |
| 463591 | Jun 10, 1997 | Jun 10, 1997 | Sanchez-O'Brien Oil & Gas Corp. | Live Oak | Brysch Gas Unit 2 #2 | 12,000 | 29732989 |
| 463591Amendment | Jun 10, 1997 | Jun 10, 1997 | Sanchez-O'Brien Oil & Gas Corp. | Live Oak | Brysch Gas Unit 2 #2 | 12,000 | 29732989 |
| 462737 | May 21, 1997 | May 21, 1997 | Sanchez-O'Brien Oil & Gas Corp. | Aransas | SKC #3 | 10,000 | 00730832 |
| 460180 | Mar 20, 1997 | Mar 20, 1997 | Sanchez-O'Brien Oil & Gas Corp. | Starr | USA 3 #9 | 15,000 | 42732977 |
| 460180Amendment | Mar 20, 1997 | Mar 20, 1997 | Sanchez-O'Brien Oil & Gas Corp. | Starr | USA 3 #9 | 15,000 | 42732977 |
| 460049 | Mar 18, 1997 | Mar 18, 1997 | Sanchez-O'Brien Oil & Gas Corp. | Starr | Sandia C #2 | 14,000 | 42732976 |
| 460049Amendment | Mar 18, 1997 | Mar 18, 1997 | Sanchez-O'Brien Oil & Gas Corp. | Starr | Sandia C #2 | 14,000 | 42732976 |
| 460049Amendment | Mar 18, 1997 | Mar 18, 1997 | Sanchez-O'Brien Oil & Gas Corp. | Starr | Sandia C #2 | 15,000 | 42732976 |
| 460049Amendment | Mar 18, 1997 | Mar 18, 1997 | Sanchez-O'Brien Oil & Gas Corp. | Starr | Sandia C #2 | 15,000 | 42732976 |
| 458492 | Feb 10, 1997 | Feb 10, 1997 | Sanchez-O'Brien Oil & Gas Corp. | Aransas | Aransas County Airport GU #1 | 8,200 | 00730826 |
| 457982 | Jan 29, 1997 | Jan 29, 1997 | Sanchez-O'Brien Oil & Gas Corp. | Goliad | Parkhill-Bednorz Gas Unit #1 | 13,706 | 17532739 |
| 456755 | Dec 27, 1996 | Dec 27, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Starr | USA 1 #8 | 14,000 | 42732946 |
| 455561 | Nov 25, 1996 | Nov 25, 1996 | Sanchez-O'Brien Oil & Gas Corp. | De Witt | Lola Fuhrken Gas Unit #1 | 13,950 | 12331733 |
| 455305 | Nov 18, 1996 | Nov 18, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Aransas | A. C. A. "A" #1 | 15,000 | 00730828 |
| 454102 | Nov 13, 1996 | Nov 13, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Starr | USA 3 #8 | 12,200 | 42732932 |
| 454102Amendment | Nov 13, 1996 | Nov 13, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Starr | USA 3 #8 | 14,000 | 42732932 |
| 453603 | Oct 8, 1996 | Oct 8, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Zapata | Serna Gas Unit #1 | 12,000 | 50531368 |
| 453603Amendment | Oct 8, 1996 | Oct 8, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Zapata | Serna Gas Unit #1 | 12,000 | 50531368 |
| 452743 | Sep 17, 1996 | Sep 17, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Starr | USA 1 #5 | 14,700 | 42732922 |
| 451963 | Aug 27, 1996 | Aug 27, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Rancho Blanco #9 | 9,200 | 47936558 |
| 451963Amendment | Aug 27, 1996 | Aug 27, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Rancho Blanco #9 | 7,550 | 47936558 |
| 450846 | Aug 21, 1996 | Aug 21, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Starr | USA 3 #1 | 12,800 | 42732908 |
| 451082 | Aug 2, 1996 | Aug 2, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Rancho Blanco #7 | 8,800 | 47936542 |
| 451082Amendment | Aug 2, 1996 | Aug 2, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Rancho Blanco #7 | 8,900 | 47936542 |
| 450953 | Jul 30, 1996 | Jul 30, 1996 | Sanchez-O'Brien Oil & Gas Corp. | San Patricio | Wpog State GU #1 | 13,000 | 40932503 |
| 450539 | Jul 18, 1996 | Jul 18, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Rancho Blanco #8 | 8,650 | 47936533 |
| 450539Amendment | Jul 18, 1996 | Jul 18, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Rancho Blanco #8 | 8,650 | 47936533 |
| 449727 | Jun 26, 1996 | Jun 26, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Starr | USA 2 #11 | 12,550 | 42732892 |
| 449685 | Jun 25, 1996 | Jun 25, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Aransas | Aca #1 | 13,350 | 00730826 |
| 449685Amendment | Jun 25, 1996 | Jun 25, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Aransas | Aransas County Airport GU #1 | 13,350 | 00730826 |
| 449685Amendment | Jun 25, 1996 | Jun 25, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Aransas | Aransas County Airport GU #1 | 13,350 | 00730826 |
| 449230 | Jun 12, 1996 | Jun 12, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Zapata | F. Ramos Gas Unit #1 | 11,500 | 50533448 |
| 448649 | May 29, 1996 | May 29, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Rancho Blanco #6 | 8,800 | 47936512 |
| 447528 | Apr 29, 1996 | Apr 29, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Aransas | SKC #1 | 13,000 | 00730824 |
| 447528Amendment | Apr 29, 1996 | Apr 29, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Aransas | SKC #2 | 13,000 | 00730824 |
| 446698 | Apr 8, 1996 | Apr 8, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Blanco, Rancho #4 | 8,100 | 47936478 |
| 446698Amendment | Apr 8, 1996 | Apr 8, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Rancho Blanco #4 | 8,100 | 47936478 |
| 446698Amendment | Apr 8, 1996 | Apr 8, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Rancho Blanco #4 | 8,100 | 47936478 |
| 445499 | Mar 4, 1996 | Mar 4, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Rancho Blanco #5 | 8,200 | 47936455 |
| 445499Amendment | Mar 4, 1996 | Mar 4, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Rancho Blanco #5 | 8,500 | 47936455 |
| 445440 | Mar 1, 1996 | Mar 1, 1996 | Sanchez-O'Brien Oil & Gas Corp. | Willacy | Rudman, Duke #1 | 16,660 | 48930975 |
| 442667 | Dec 11, 1995 | Dec 11, 1995 | Sanchez-O'Brien Oil & Gas Corp. | Starr | USA 2 #7 | 12,183 | 42732811 |
| 442667Amendment | Dec 11, 1995 | Dec 11, 1995 | Sanchez-O'Brien Oil & Gas Corp. | Starr | USA 2 #7 | 14,500 | 42732811 |
| 441440 | Oct 31, 1995 | Oct 31, 1995 | Sanchez-O'Brien Oil & Gas Corp. | Chambers | Texas Scottish Rite Hospital #1 | 12,000 | 07132041 |
| 441005 | Oct 18, 1995 | Oct 18, 1995 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Leyendecker #5 | 9,500 | 47936381 |
| 441005Amendment | Oct 18, 1995 | Oct 18, 1995 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Leyendecker #5 | 9,500 | 47936381 |
| 439503 | Aug 31, 1995 | Aug 31, 1995 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Rancho Blanco #3 | 8,700 | 47936360 |
| 439503Amendment | Aug 31, 1995 | Aug 31, 1995 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Rancho Blanco #3 | 8,700 | 47936360 |
| 439098 | Aug 25, 1995 | Aug 25, 1995 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Hubberd Estate "B" #1 | 7,290 | 47934855 |
| 438770 | Aug 10, 1995 | Aug 10, 1995 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Rancho Blanco #2 | 9,100 | 47936352 |
| 438770Amendment | Aug 10, 1995 | Aug 10, 1995 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Rancho Blanco #2 | 9,100 | 47936352 |
| 438215 | Jul 26, 1995 | Jul 26, 1995 | Sanchez-O'Brien Oil & Gas Corp. | Starr | USA 1 #6 | 14,381 | 42732784 |
| 438215Amendment | Jul 26, 1995 | Jul 26, 1995 | Sanchez-O'Brien Oil & Gas Corp. | Starr | USA 1 #6 | 14,381 | 42732784 |
| 438098 | Jul 21, 1995 | Jul 21, 1995 | Sanchez-O'Brien Oil & Gas Corp. | Hidalgo | Coates #2 | 12,500 | 21532248 |
| 437575 | Jul 6, 1995 | Jul 6, 1995 | Sanchez-O'Brien Oil & Gas Corp. | San Patricio | W.P.O.G. #1 | 16,000 | 40932479 |
| 437575Amendment | Jul 6, 1995 | Jul 6, 1995 | Sanchez-O'Brien Oil & Gas Corp. | San Patricio | W.P.O.G. #1 | 16,000 | 40932479 |
| 437575Amendment | Jul 6, 1995 | Jul 6, 1995 | Sanchez-O'Brien Oil & Gas Corp. | San Patricio | W.P.O.G. #1 | 17,000 | 40932479 |
| 436561 | Jun 6, 1995 | Jun 6, 1995 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Rancho Blanco #1 | 7,700 | 47936305 |
| 436561Amendment | Jun 6, 1995 | Jun 6, 1995 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Rancho Blanco #1 | 7,700 | 47936305 |
| 434788 | Apr 12, 1995 | Apr 12, 1995 | Sanchez-O'Brien Oil & Gas Corp. | Kenedy | KMF #4 | 14,500 | 26131161 |
| 433369 | Feb 28, 1995 | Feb 28, 1995 | Sanchez-O'Brien Oil & Gas Corp. | Starr | Orive, A. #8 | 6,500 | 42732741 |
| 430742 | Dec 7, 1994 | Dec 7, 1994 | Sanchez-O'Brien Oil & Gas Corp. | Starr | Texaco Fee "D" #1 | 7,000 | 42732717 |
| 430543 | Dec 2, 1994 | Dec 2, 1994 | Sanchez-O'Brien Oil & Gas Corp. | Starr | Sandia "C" #3 | 13,248 | 42732715 |
| 430543Amendment | Dec 2, 1994 | Dec 2, 1994 | Sanchez-O'Brien Oil & Gas Corp. | Starr | Sandia "C" #3 | 14,248 | 42732715 |
| 430145 | Nov 17, 1994 | Nov 17, 1994 | Sanchez-O'Brien Oil & Gas Corp. | Karnes | Bauhof Gas Unit #1 | 7,200 | 25531333 |
| 429799 | Nov 8, 1994 | Nov 8, 1994 | Sanchez-O'Brien Oil & Gas Corp. | Starr | Texaco Fee "B" #1 | 5,250 | 42732709 |
| 428849 | Oct 6, 1994 | Oct 6, 1994 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Hereford, L. M. "B" #47 | 9,700 | 47936205 |
| 428635 | Sep 30, 1994 | Sep 30, 1994 | Sanchez-O'Brien Oil & Gas Corp. | Starr | Garcia L&L Co. "C" #13 | 7,700 | 42732705 |
| 428222Amendment | Sep 22, 1994 | Sep 22, 1994 | Sanchez-O'Brien Oil & Gas Corp. | McMullen | Lindholm Deep Gas Unit 48 #1 | 16,000 | 31133041 |
| 428030 | Sep 21, 1994 | Sep 21, 1994 | Sanchez-O'Brien Oil & Gas Corp. | Karnes | Bauhof Gas Unit #1 | 13,700 | 25531333 |
| 427916 | Sep 9, 1994 | Sep 9, 1994 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Hereford, L. M. #46 | 9,700 | 47936179 |
| 427915 | Sep 9, 1994 | Sep 9, 1994 | Sanchez-O'Brien Oil & Gas Corp. | Duval | Hahl, C.W. "B" #1 | 13,000 | 13137972 |
| 419892Amendment | Sep 1, 1994 | Sep 1, 1994 | Sanchez-O'Brien Oil & Gas Corp. | Karnes | Bauhof Gas Unit #1 | 13,700 | 25531333 |
| 427255 | Aug 22, 1994 | Aug 22, 1994 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Hereford, L.M. "B" #45 | 9,700 | 47936169 |
| 427255Amendment | Aug 22, 1994 | Aug 22, 1994 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Hereford, L.M. "B" #45 | 9,500 | 47936169 |
| 426125 | Jul 21, 1994 | Jul 21, 1994 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Hereford, L.M. "A" #44 | 9,800 | 47936147 |
| 426124 | Jul 21, 1994 | Jul 21, 1994 | Sanchez-O'Brien Oil & Gas Corp. | Kenedy | KMF #3 | 13,500 | 26131154 |
| 426124Amendment | Jul 21, 1994 | Jul 21, 1994 | Sanchez-O'Brien Oil & Gas Corp. | Kenedy | KMF #3 | 13,500 | 26131154 |
| 425624 | Jul 6, 1994 | Jul 6, 1994 | Sanchez-O'Brien Oil & Gas Corp. | Kenedy | KMF #2 | 14,375 | 26131153 |
| 425542 | Jul 5, 1994 | Jul 5, 1994 | Sanchez-O'Brien Oil & Gas Corp. | Starr | USA 3 #2 | 13,700 | 42732688 |