| 612957 | Jan 24, 2006 | Jan 24, 2006 | Santos USA Corp. | Galveston 175-S Unit #2 | 14,000 | 60530171 |
| 612957Amendment | Jan 24, 2006 | Jan 24, 2006 | Santos USA Corp. | Galveston 175-S Unit #2 | 14,000 | 60530171 |
| 555869 | Jan 7, 2005 | Jan 7, 2005 | Manti Operating Company | State Tract 341 #1 | 9,350 | 60530169 |
| 550773 | Sep 20, 2004 | Sep 20, 2004 | Santos USA Corp. | Galveston 166-S Unit #1 | 18,000 | 60530170 |
| 550773Amendment | Sep 20, 2004 | Sep 20, 2004 | Santos USA Corp. | Galveston 175-S Unit #1 | 13,500 | 60530170 |
| 494202 | Apr 19, 2000 | Apr 19, 2000 | Bois D'arc Offshore Ltd. | Galveston 364-S (N/2) #1 | 8,700 | 60530167 |
| 488551 | Oct 15, 1999 | Oct 15, 1999 | Prolithic Energy Company, L.P. | State Tract 233 #1 | 9,800 | 16731339 |
| 476665 | May 28, 1998 | May 28, 1998 | Transtexas Gas Corporation | State Tract 290-S #1 | 9,300 | 16731311 |
| 425985 | Jul 20, 1994 | Jul 20, 1994 | Fina Oil & Chemical Company | State Tract 308-S #1 | 13,500 | 60530159 |
| 425006 | Jun 21, 1994 | Jun 21, 1994 | Mitchell Energy Corporation | State Tract 234-S #1 | 9,480 | 60530145 |
| 395345 | Dec 23, 1991 | Dec 23, 1991 | Samedan Oil Corp. -Offshore Div. | S. T. 349-S #1 | 11,900 | 60530158 |
| 376956 | Aug 28, 1990 | Aug 28, 1990 | Walter Oil & Gas Corporation | State Tract 175-S #1UL | 7,644 | 60530153 |
| 375547 | Jul 16, 1990 | Jul 16, 1990 | Santa FE Energy Oper. Part., LP | State Tract 293-S #1 | 9,000 | 60530157 |
| 375546 | Jul 16, 1990 | Jul 16, 1990 | Santa FE Energy Oper. Part., LP | State Tract 315-S #1 | 9,000 | 60530156 |
| 373970 | Jun 1, 1990 | Jun 1, 1990 | Walter Oil & Gas Corporation | State Tract 175-S #1UL | 7,650 | 60530153 |
| 360223 | Jun 8, 1989 | Jun 8, 1989 | Pelto Oil Company | State Tract 163-S #1 | 9,000 | 60530155 |
| 353415 | Nov 17, 1988 | Nov 17, 1988 | Mitchell Energy Corporation | State Tract 228-S #1 | 9,061 | 60530006 |
| 350979 | Sep 9, 1988 | Sep 9, 1988 | Brooklyn Union Explor. Co., Inc. | S.T. 233-S #1 | 9,000 | 60530154 |
| 350979Amendment | Sep 9, 1988 | Sep 9, 1988 | Brooklyn Union Explor. Co., Inc. | State Tract 233-S #1 | 9,000 | 60530154 |
| 350979Amendment | Sep 9, 1988 | Sep 9, 1988 | Brooklyn Union Explor. Co., Inc. | State Tract 233-S #1ST | 8,970 | 60530154 |
| 350979Amendment | Sep 9, 1988 | Sep 9, 1988 | Brooklyn Union Explor. Co., Inc. | State Tract 233-S #1ST | 9,220 | 60530154 |
| 350937 | Sep 8, 1988 | Sep 8, 1988 | Mitchell Energy Corporation | State Tract 236-S #1 | 10,004 | 60530149 |
| 346572 | May 18, 1988 | May 18, 1988 | Mitchell Energy Corporation | State Tract 236-S #1 | 10,004 | 60530149 |
| 323455 | Nov 26, 1986 | Nov 26, 1986 | Walter Oil & Gas Corporation | State Tract 175-S #1 | 8,500 | 60530153 |
| 286471 | Sep 24, 1985 | Sep 24, 1985 | Mitchell Energy Corporation | State Tract 234-S #1 | 10,000 | 60530145 |
| 284517 | Sep 4, 1985 | Sep 4, 1985 | Sun Expl. & Prod. Co.-Lafayette | State Tract 26 #4 | 7,800 | 60500006 |
| 278175 | Jun 20, 1985 | Jun 20, 1985 | Houston Oil & Minerals Corp. | State Tract 173-S #3 | 8,630 | 60530045 |
| 273977 | May 3, 1985 | May 3, 1985 | Houston Oil & Minerals Corp. | State Tract 173-S #3 | 8,630 | 60530045 |
| 274248 | May 2, 1985 | May 2, 1985 | Sun Expl. & Prod. Co.-Lafayette | State Lease 27 #3 | 7,800 | 60500009 |
| 263629 | Dec 31, 1984 | Dec 31, 1984 | Mitchell Energy Offshore Corp. | State Tract 185-L NE/4 #1 | 11,000 | 60530151 |
| 261200 | Dec 13, 1984 | Dec 13, 1984 | Houston Oil & Minerals Corp. | Shipwreck Frio Gas Unit #2 | 13,100 | 60530029 |
| 259777 | Dec 3, 1984 | Dec 3, 1984 | Mitchell Energy Corporation | State Tract 237-S #1 | 11,500 | 60530150 |
| 255025 | Oct 19, 1984 | Oct 19, 1984 | Mitchell Energy Offshore Corp. | State Tract 236-S #1 | 11,000 | 60530149 |
| 247086 | Jul 31, 1984 | Jul 31, 1984 | Houston Oil & Minerals Corp. | State Tract 181-S #7 | 13,000 | 60530148 |
| 240978 | May 21, 1984 | May 21, 1984 | Houston Oil & Minerals Corp. | State Tract 181-S #7 | 13,500 | 60530148 |
| 228253 | Jan 27, 1984 | Jan 27, 1984 | Houston Oil & Minerals Corp. | State Tract 181-S #6 | 12,037 | 60530144 |
| 180332 | Dec 15, 1982 | Dec 15, 1982 | Mitchell Energy Offshore Corp. | State Tract 234-S #1 | 10,000 | 60530145 |
| 166440 | Jul 14, 1982 | Jul 14, 1982 | Houston Oil & Minerals Corp. | S.T. 181-S #6 | 13,050 | 60530144 |
| 154043 | Mar 1, 1982 | Mar 1, 1982 | Coral Petroleum Development Inc. | State Tract 146-S #3A | 6,400 | 60530140 |
| 151681 | Feb 24, 1982 | Feb 24, 1982 | Mitchell Energy Offshore Corp. | State Tract 176-S #21582 | 8,900 | 60530035 |
| 150117 | Feb 2, 1982 | Feb 2, 1982 | Coral Petroleum Development Inc. | State Tract 146-S #1 | 4,494 | 60530134 |
| 148358 | Jan 25, 1982 | Jan 25, 1982 | McMoran Exploration Co. | State Tract 151-S Unit #1 | 12,191 | 60530143 |
| 144534 | Dec 16, 1981 | Dec 16, 1981 | Coral Petroleum Development Inc. | State Tract 146-S #5 | 6,000 | 60530141 |
| 144533 | Dec 16, 1981 | Dec 16, 1981 | Coral Petroleum Development Inc. | State Tract 146-S #3 | 8,500 | 60530140 |
| 144532 | Dec 16, 1981 | Dec 16, 1981 | Coral Petroleum Development Inc. | State Tract 146-S #4 | 9,000 | 60530139 |
| 142197 | Dec 1, 1981 | Dec 1, 1981 | Coral Petroleum Development Inc. | State Tract 146-S #2 | 7,000 | 60530138 |
| 144349 | Nov 24, 1981 | Nov 24, 1981 | Houston Oil & Minerals Corp. | Shipwreck Frio Gas Unit NO.1 #1 | 12,383 | 60530047 |
| 132681 | Aug 11, 1981 | Aug 11, 1981 | Houston Oil & Minerals Corp. | Shipwreck Frio Gas Unit #1 #1 | 12,383 | 60530047 |
| 129162 | Aug 7, 1981 | Aug 7, 1981 | MTS Limited Partnership | State Tract 217-S #1 | 12,000 | 60530137 |
| 124026 | Jul 6, 1981 | Jul 6, 1981 | Coral Petroleum Development Inc. | State Tract 146-S #1 | 4,500 | 60530134 |
| 121193 | Jun 16, 1981 | Jun 16, 1981 | Shell Oil Company | State LEASE79297 #1 | 8,180 | 60530135 |
| 118631 | May 20, 1981 | May 20, 1981 | Exxon Corp. | State Tract 239-S #1 | 8,567 | 60530133 |
| 117425 | May 7, 1981 | May 7, 1981 | Mitchell Energy Offshore Corp. | State Tract 176-S #1-A | 9,100 | 60530005 |
| 110293 | Mar 2, 1981 | Mar 2, 1981 | Rutherford Oil Corporation | Galveston Area State Tract 341-S #1 | 9,562 | 60530132 |
| 107328 | Jan 23, 1981 | Jan 23, 1981 | Houston Oil & Minerals Corp. | Shipwreck Frio Gas Unit No. 1 #1 | 12,400 | 60530047 |
| 105154 | Dec 31, 1980 | Dec 31, 1980 | Mesa Petroleum Co. | State Tract 218-S #1 | 10,550 | 60530131 |
| 102254 | Dec 15, 1980 | Dec 15, 1980 | Rutherford Oil Corporation | Galveston Area State Tract 349-S #1 | 9,500 | 60530130 |
| 108885 | Dec 11, 1980 | Dec 11, 1980 | Houston Oil & Minerals Corp. | State Tract 181-S #5 | 12,420 | 60530049 |
| 101253 | Dec 8, 1980 | Dec 8, 1980 | Mitchell Energy Offshore Corp. | State Tract 176-S #3 | 9,600 | 60580002 |
| 100472 | Nov 26, 1980 | Nov 26, 1980 | Mitchell Energy Offshore Corp. | State Tract 176-S #1-A | 9,100 | 60530005 |
| 100454 | Nov 25, 1980 | Nov 25, 1980 | Mitchell Energy Offshore Corp. | State Tract 176-S #5 | 13,500 | 60530035 |
| 99760 | Nov 19, 1980 | Nov 19, 1980 | Ladd Petroleum Corp. | St. Lease NO 157-S #4 | 7,585 | 60530129 |
| 83474 | Jun 10, 1980 | Jun 10, 1980 | Mitchell Energy Offshore Corp. | State Tract 179-S #4 | 10,000 | 60530128 |
| 77997 | Apr 11, 1980 | Apr 11, 1980 | Champlin Petroleum Co. | State Tract 360-S #1 | 8,740 | 60530127 |
| 71360 | Jan 31, 1980 | Jan 31, 1980 | Mitchell Energy Offshore Corp. | State Tract 179-S #3 | 9,154 | 60530126 |
| 68614 | Jan 4, 1980 | Jan 4, 1980 | Phoenix Resources Co. | State Tract 326-S S.L. 80452 #1 | 9,500 | 60530125 |
| 49503 | May 28, 1979 | May 28, 1979 | Mitchell Energy Corporation | State Tract 176-S #3 | 9,600 | 60580001 |
| 33928 | Oct 3, 1978 | Oct 3, 1978 | Houston Oil & Minerals Corp. | Shipwreck Frio Gas Unit No. 1 #1 | 13,500 | 60530047 |
| 21478 | Apr 5, 1978 | Apr 5, 1978 | Houston Oil & Minerals Corp. | State Tract 292-S #1 | 9,000 | 60530121 |
| 21477 | Apr 5, 1978 | Apr 5, 1978 | Houston Oil & Minerals Corp. | S.T. 291-S #1 | 9,000 | 60530120 |
| 14697 | Dec 27, 1977 | Dec 27, 1977 | Houston Oil & Minerals Corp. | State Tract 288-S #1 | 8,500 | 60530119 |
| 6731 | Sep 28, 1977 | Sep 28, 1977 | Mitchell Energy Offshore Corp. | State Tract 178-S #1 | 9,680 | 60530118 |
| 8274 | Sep 23, 1977 | Sep 23, 1977 | Houston Oil & Minerals Corp. | State Tract 169-S #1 | 9,248 | 60530051 |
| 7064 | Sep 8, 1977 | Sep 8, 1977 | Mitchell Energy Offshore Corp. | State Tract 179-S #2 | 13,200 | 60530052 |
| 5868 | Aug 12, 1977 | Aug 12, 1977 | Houston Oil & Minerals Corp. | State Tract 174-S #4 | 12,000 | 60530047 |
| 4498 | Aug 1, 1977 | Aug 1, 1977 | Mitchell Energy Offshore Corp. | State Tract 177-S #1 | 9,250 | 60530116 |
| 3792 | Jul 25, 1977 | Jul 25, 1977 | Gulf Oil Corp. | State Tract 308-S #1 | 16,000 | 60530117 |