| Martinez, S. G-4-75828 | Bluestone Natural Res. II, LLC only | Hundido (Lobo) | Zapata | 1 | 0 | 475K | Jan 1993 – Jul 2014 |
| Garza G-4-82508 | Columbus Energy Corp. only | Hundido (Lobo) | Zapata | 1 | 0 | 3.45K | Jan 1993 – Jul 1993 |
| Benavides, Belia R. "C" G-4-82509 | Varas Energy Operating Company, only | Hundido (Lobo) | Zapata | 1 | 0 | 1.18M | Jan 1993 – Jul 2026 |
| Sanchez-McMurrey G-4-85037 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 0 | 319K | Jan 1993 – Jul 2026 |
| Sanchez-McMurrey G-4-86685 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 0 | 1.09M | Jan 1993 – Jul 2026 |
| Decarreon, G. G. G-4-87825 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 0 | 517K | Jan 1993 – Jul 2026 |
| Rathmell, J. G. G-4-89704 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 0 | 454K | Jan 1993 – Jul 2026 |
| Sanchez-McMurrey G-4-92261 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 0 | 997K | Jan 1993 – Jul 2026 |
| Rathmell, J.G. G-4-99141 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 0 | 3.31M | Jan 1993 – Jul 2026 |
| Sanchez-McMurray G-4-101115 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 0 | 930K | Jan 1993 – Jul 2026 |
| Sanchez-McMurrey G-4-102799 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 0 | 377K | Jan 1993 – Jul 2026 |
| Sanchez-McMurrey G-4-103181 | North Central Oil Corp. only | Hundido (Lobo) | Zapata | 1 | 0 | 0 | Jan 1993 – Oct 2003 |
| Benavides, Belia R.-B G-4-104723 | Enron Oil & Gas Company only | Hundido (Lobo) | Zapata | 1 | 0 | 0 | Jan 1993 – Jan 1993 |
| Rathmell, J.G. G-4-106037 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 0 | 123K | Jan 1993 – Jul 2026 |
| Benavides, Belia R.-B G-4-106618 | Varas Energy Operating Company, only | Hundido (Lobo) | Zapata | 1 | 0 | 566K | Jan 1993 – Jul 2026 |
| De Carreon, G. G. G-4-120248 | Conoco Inc. only | Hundido (Lobo) | Zapata | 1 | 0 | 1.72K | Jan 1993 – Oct 1993 |
| Gutierrez, B. G. G-4-131197 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 0 | 1.12M | Jan 1993 – Jul 2026 |
| Martinez Trust G-4-144472 | Enron Oil & Gas Company only | Hundido (Lobo) | Zapata | 1 | 0 | 207K | Feb 1993 – Feb 1999 |
| Gutierrez, B. G. G-4-144502 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 0 | 910K | Feb 1993 – Jul 2026 |
| Rathmell, J. G. G-4-144553 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 0 | 1.15M | Mar 1993 – Jul 2026 |
| Sanchez-McMurrey G-4-145567 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 0 | 1.57M | Apr 1993 – Jul 2026 |
| Decarreon, G. G. G-4-145698 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 0 | 2.33M | Apr 1993 – Jul 2026 |
| Rathmell, J.G. G-4-145736 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 0 | 1.24M | Apr 1993 – Jul 2026 |
| Gutierrez, B. G. G-4-146141 | Conoco Inc. only | Hundido (Lobo) | Zapata | 1 | 0 | 29.7K | Jul 1993 – Mar 1998 |
| Rathmell, J.G. G-4-147261 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 0 | 2.59M | Nov 1993 – Jul 2026 |
| Sanchez-McMurrey G-4-147579 | North Central Oil Corp. only | Hundido (Lobo) | Zapata | 1 | 0 | 33.2K | Dec 1993 – Feb 2000 |
| Decarreon, G. G. G-4-147732 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 0 | 1.65M | Dec 1993 – Jul 2026 |
| Sanchez-McMurrey G-4-147756 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 0 | 1.91M | Dec 1993 – Jul 2026 |
| Benavides, Belia R. "B" G-4-148185 | Varas Energy Operating Company, only | Hundido (Lobo) | Zapata | 1 | 0 | 201K | Jan 1994 – Jul 2026 |
| Benavides, Belia R. "B" G-4-148274 | Varas Energy Operating Company, only | Hundido (Lobo) | Zapata | 1 | 0 | 2.57M | Feb 1994 – Jul 2026 |
| Decarreon, G.G. G-4-149179 | North Central Oil Corp. only | Hundido (Lobo) | Zapata | 1 | 0 | 69.7K | Apr 1994 – Jan 2000 |
| Benavides, Belia R. "C" G-4-149544 | Varas Energy Operating Company, only | Hundido (Lobo) | Zapata | 1 | 0 | 2.37M | Apr 1994 – Jul 2026 |
| Rathmell, J.G. G-4-149972 | Plains Exploration & Prod. Co. only | Hundido (Lobo) | Zapata | 1 | 0 | 546K | May 1994 – Oct 2011 |
| Benavides, Belia R. "B" G-4-150178 | Varas Energy Operating Company, only | Hundido (Lobo) | Zapata | 1 | 0 | 2.98M | Jun 1994 – Jul 2026 |
| Benavides, B. R. G-4-150397 | BNR Operating, LLC only | Hundido (Lobo) | Zapata | 1 | 0 | 714K | Apr 1994 – Jul 2026 |
| Benavides, Belia R. "B" G-4-150705 | Varas Energy Operating Company, only | Hundido (Lobo) | Zapata | 1 | 0 | 903K | Jul 1994 – Jul 2026 |
| Rathmell, J. G. G-4-151524 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 0 | 5.56M | Oct 1994 – Jul 2026 |
| Decarreon, G.G. G-4-151654 | North Central Oil Corp. only | Hundido (Lobo) | Zapata | 1 | 0 | 201K | Oct 1994 – May 1999 |
| Sanchez-McMurrey G-4-152449 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 0 | 2.37M | Dec 1994 – Jul 2026 |
| Vergara G-4-153064 | Pioneer Resources Producing, L.P only | Hundido (Lobo) | Zapata | 1 | 0 | 291K | Jan 1995 – Jan 1998 |
| Rathmell, J.G. G-4-153258 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 0 | 3.3M | Jan 1995 – Jul 2026 |
| Benavides, Belia R. "B" G-4-154548 | Varas Energy Operating Company, only | Hundido (Lobo) | Zapata | 1 | 0 | 2.71M | May 1995 – Jul 2026 |
| Benavides, Belia R. "B" G-4-155904 | Varas Energy Operating Company, only | Hundido (Lobo) | Zapata | 1 | 0 | 2.62M | Oct 1995 – Jul 2026 |
| Benavides, Belia R. "B" G-4-156907 | Varas Energy Operating Company, only | Hundido (Lobo) | Zapata | 1 | 0 | 2.05M | Nov 1995 – Jul 2026 |
| Benavides, Belia R. "C" G-4-157441 | EOG Resources, Inc. only | Hundido (Lobo) | Zapata | 1 | 0 | 124K | Dec 1995 – Jan 2010 |
| Benavides, Bela R. "B" G-4-159486 | Varas Energy Operating Company, only | Hundido (Lobo) | Zapata | 1 | 0 | 1.61M | May 1996 – Jul 2026 |
| Sanchez-McMurrey G-4-161693 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 0 | 1.09M | Dec 1996 – Jul 2026 |
| Sanchez-McMurrey G-4-161756 | North Central Oil Corp. only | Hundido (Lobo) | Zapata | 1 | 0 | 161K | Jan 1997 – May 2000 |
| Rathmell, J.G. G-4-162715 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 0 | 4.4M | Apr 1997 – Jul 2026 |
| Rathmell, J.G. G-4-68875 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 0 | 1.89M | Jan 1993 – Jul 2026 |