| Muzza, G. P. G-4-117914 | Block "T" Petroleum, Inc. only | Fandango (Wilcox Consolidated) | Zapata | 1 | 0 | 2.93M | Jan 1993 – Mar 1996 |
| Blocker, John R. 1839 G-4-116462 | Brask-Dumont Ranch, Inc. only | Gold River, North (Olmos) | Webb | 1 | 0 | 6.16K | May 1993 – Mar 2026 |
| Blocker, John R. 1841 G-4-113625 | Brask-Dumont Ranch, Inc. only | Gold River, North (Olmos) | Webb | 1 | 0 | 35.8K | May 1993 – Mar 2026 |
| University 22 O-10-40656 | Sabalo II Operating, LLC only | Block 5 (Devonian) | Andrews | 1 | 0 | 0 | — |
| Blocker, John R. 810 G-4-113624 | Lewis Petro Properties, Inc. only | Blocker Ranch (Olmos N-2) | Webb | 1 | 0 | 159 | May 1993 – Jan 2000 |
| University 7 "Berkley" O-10-40781 | SM Energy Company only | University Block 9 (Penn.) | Andrews | 1 | 0 | 0 | — |
| Blocker, John R. 1843 G-4-113623 | Brask-Dumont Ranch, Inc. only | Gold River, North (Olmos) | Webb | 1 | 0 | 6.77K | May 1993 – Mar 2026 |
| Blocker, John R. 1841 G-4-113622 | Brask-Dumont Ranch, Inc. only | Gold River, North (Olmos) | Webb | 1 | 0 | 56.4K | Jan 1993 – Mar 2026 |
| Texas University -Q- O-10-41217 | Conocophillips Company only | University Block 13 (Devonian) | Andrews | 1 | 0 | 0 | — |
| Phillips University P O-10-41356 | Sandridge Expl. and Prod., LLC only | Block 11 (Fusselman) | Andrews | 1 | 0 | 0 | — |
| State of Texas AR O-10-41514 | Deep Blue Operating I LLC only | Block 7 (Devonian) | Martin | 1 | 0 | 0 | — |
| Blocker, John R. 1839 G-4-113621 | Brask-Dumont Ranch, Inc. only | Gold River, North (Olmos) | Webb | 1 | 0 | 69.4K | Jan 1993 – Feb 2014 |
| Blocker, John R. 1837 G-4-113620 | Brask-Dumont Ranch, Inc. only | Gold River, North (Olmos) | Webb | 1 | 0 | 13.8K | Jan 1993 – Mar 2026 |
| Blocker, John R -1854- G-4-104100 | Lewis Petro Properties, Inc. only | Gold River, North (Olmos) | Webb | 1 | 0 | 826 | May 1994 – Nov 1999 |
| Blocker, John R. -1042- G-4-104030 | Lewis Petro Properties, Inc. only | Gold River, North (Olmos) | Webb | 1 | 0 | 10.4K | Feb 1993 – May 2009 |
| Blocker Ranch "H" 1843 G-4-100527 | Jackson Energy Development, Inc. only | Apache Ranch (Olmos) | Webb | 1 | 0 | 0 | — |
| Blocker "H" 1843 G-4-98427 | Jackson Energy Development, Inc. only | Gold River, North (Olmos) | Webb | 1 | 0 | 0 | — |
| Blocker Ranch "H" 1841 G-4-98426 | Jackson Energy Development, Inc. only | Gold River, North (Olmos) | Webb | 1 | 0 | 0 | — |
| Blocker Ranch H 1841 G-4-94384 | Jackson Energy Development, Inc. only | Gold River, North (Olmos) | Webb | 1 | 0 | 858 | Jun 1993 – Jun 1993 |
| Fisher A O-10-42596 | Vin Fisher Operating, Inc. only | Block a-34 (Clearfork) | Andrews | 1 | 0 | 0 | — |
| Hubberd-Frost Nat'l Bank G.U. G-4-94044 | Block "T" Petroleum, Inc. only | Rosita, NW (Wilcox Cons.) | Duval | 1 | 0 | 6.17M | Jan 1993 – Apr 2026 |
| Quantum SWD O-10-42782 | Walsh & Watts, Inc. only | Block 12 | Andrews | 1 | 0 | 0 | — |
| University 20-2 O-10-44046 | Endeavor Energy Resources L.P. only | Block 20 (Delaware Cons.) | Winkler | 1 | 0 | 0 | — |
| Block 12 O-10-44293 | BVX Operating, Inc. only | Block 12 (Devonian) | Andrews | 1 | 0 | 0 | — |
| Briscoe Tract II Block 3 G-4-91104 | Legend Natural Gas II, LP only | Gold River, North (Olmos) | Webb | 1 | 0 | 12.9K | Dec 2000 – Apr 2005 |
| Briscoe Block 3 G-4-87752 | Legend Natural Gas II, LP only | Gold River, North (Olmos) | Webb | 1 | 0 | 8.28K | Feb 2001 – Apr 2005 |
| University a 37 O-10-44624 | Apache Corporation only | Block 31 (Devonian) | Crane | 1 | 0 | 0 | — |
| Blocker, John R. -809- G-4-86798 | Lewis Petro Properties, Inc. only | Blocker Ranch (Olmos N-2) | Webb | 1 | 0 | 228 | May 1993 – Jan 2000 |
| Ed Rachal "West" G-4-84455 | Lewis Petro Properties, Inc. only | Blocker Ranch (Olmos N-2) | Webb | 1 | 0 | 493 | Jan 1993 – Jan 1994 |
| Blocker, John R. -1845- G-4-84444 | Calibogue Corporation only | Blocker Ranch (Olmos N-2) | Webb | 1 | 0 | 0 | — |
| Weatherby-Wernecke Gas Unit G-4-81828 | Block "T" Petroleum, Inc. only | Rosita, NW (Wilcox Cons.) | Duval | 1 | 0 | 2.59M | Jan 1993 – Mar 2005 |
| Block 31 Unit O-10-44933 | Hilcorp Energy Company only | Block 31 (Clear Fork) | Crane | 4 | 0 | 0 | — |
| Blocker, John R. -1843- G-4-81622 | Brask-Dumont Ranch, Inc. only | Blocker Ranch (Olmos N-3) | Webb | 1 | 0 | 0 | — |
| Blocker Ranch 1840 G-4-81375 | Rosetta Resources Operating LP only | Gold River, North (Olmos) | Webb | 1 | 0 | 0 | — |
| Briscoe Tract 13, Block 3 G-4-79339 | Legend Natural Gas II, LP only | Gold River, North (Olmos) | Webb | 1 | 0 | 47.1K | Jan 1993 – Mar 2005 |
| Briscoe Tract 22 Block 3 G-4-79336 | Vaquero Operating only | Gold River, North (Olmos) | Webb | 1 | 0 | 74.9K | Jan 1993 – Feb 2005 |
| Briscoe Tract 23 Block 2 G-4-78727 | Vaquero Operating only | Gold River, North (Olmos) | Webb | 1 | 0 | 11.9K | Dec 2000 – May 2010 |
| Fisher C O-10-45040 | Ring Energy, Inc. only | Block a-34 (Clearfork) | Andrews | 1 | 0 | 0 | — |
| Pecos South 869 SWD O-10-45088 | Layne SWD, LLC only | Reeves-Block 4 (del. 4430) | Reeves | 1 | 0 | 0 | — |
| Briscoe, TRT, 30, Block 2 G-4-78715 | Vaquero Operating only | Gold River, North (Olmos) | Webb | 1 | 0 | 75.1K | Jan 1993 – Jul 2010 |
| Weatherby-Wernecke Gas Unit G-4-74899 | Block "T" Petroleum, Inc. only | Rosita, NW (Wilcox Cons.) | Duval | 1 | 0 | 8.26M | Jan 1993 – Jul 2025 |
| East Side Block Unit G-4-73233 | Royal Production Company, Inc. only | Agua Dulce (2070) | Nueces | 1 | 0 | 0 | — |
| Blocker Ranch G-4-72806 | Monterrey Petroleum Corp. only | Apache Ranch (Olmos Lower) | Webb | 1 | 0 | 0 | — |
| Blocker Ranch G-4-72805 | Monterrey Petroleum Corp. only | Apache Ranch (Olmos) | Webb | 1 | 0 | 0 | — |
| S.E. Crews Mast '8' O-10-45239 | Ring Energy, Inc. only | Block a-34 (San Andres) | Andrews | 1 | 0 | 0 | — |
| State Tract 901-S G-4-71731 | TR Offshore, LLC only | Block 901 (7750) | Mustang IS-SB | 1 | 0 | 0 | — |
| State Tract 901-S G-4-71271 | National Energy Group, Inc. only | Block 901 (7650) | Mustang IS-SB | 1 | 0 | 0 | — |
| East Side Block Unit G-4-70361 | Wallis Energy, Inc. only | Agua Dulce (Consolidated Frio) | Nueces | 1 | 0 | 0 | — |
| Blocker Ranch G-4-69970 | Lewis Petro Properties, Inc. only | Gold River, North (Olmos) | Webb | 1 | 0 | 45.2K | Jan 1993 – Apr 2001 |
| East Side Block A-1 G-4-57669 | Royal Production Company, Inc. only | Agua Dulce (Vicksburg Consl.) | Nueces | 1 | 0 | 0 | — |