| Jennings, J. D. O-4-6058 | Sue-Ann Operating, L.C. only | Jennings, W. (Queen City NO 2) | Zapata | 21 | 499K | 1.11M | Jan 1993 – Jul 2026 |
| Guerra, Raul O-4-10703 | Varas Energy Operating Company, only | Lopeno ( Queen City Oil) | Zapata | 3 | 206K | 485K | Jan 1993 – Jul 2026 |
| Jennings, J. D. O-4-9597 | Sue-Ann Operating, L.C. only | Jennings, West (2100) | Zapata | 4 | 164K | 158K | Jan 1993 – Jul 2026 |
| Jennings, J. D. O-4-1303 | Sue-Ann Operating, L.C. only | Jennings | Zapata | 24 | 95.9K | 11 | Jan 1993 – Jul 2026 |
| Ramirez, Blas O-4-7946 | Varas Energy Operating Company, only | Lopeno ( Queen City Oil) | Zapata | 1 | 78.4K | 158K | Jan 1993 – Jul 2026 |
| Jennings, J. D. O-4-13036 | Sue-Ann Operating, L.C. only | Jennings, E. (Queen City NO.9) | Zapata | 2 | 75.7K | 233K | Jun 2001 – Jul 2026 |
| Garcia, Anastasio O-4-4677 | Synthetic Energy Corporation only | Charco Redondo | Zapata | 214 | 71.4K | 1 | Jan 1993 – Jul 2026 |
| Jennings, J.D. O-4-12728 | Sue-Ann Operating, L.C. only | Jennings, W. (1370) | Zapata | 3 | 66K | 58K | Nov 1997 – Jul 2026 |
| Jennings, J. D. O-4-5823 | Sue-Ann Operating, L.C. only | Jennings, West (Crockett) | Zapata | 20 | 46.2K | 10 | Jan 1993 – Jul 2026 |
| Slator Ranch O-4-13753 | Mountain V Texas, LLC only | Tartan (Yegua) | Zapata | 5 | 45.2K | 0 | Aug 2012 – Jul 2026 |
| De Lopez, Joseta M. O-4-8756 | Kendrick, Barbara S. only | Mirando Valley | Zapata | 3 | 31K | 22 | Jan 1993 – Jul 2026 |
| Escobas -B-E- Unit O-4-5301 | Energy 2000, Inc. only | Escobas | Zapata | 29 | 29.8K | 21 | Jan 1993 – Jul 2026 |
| Hal Lopeno O-4-14070 | Varas Energy Operating Company, only | Lopeno ( Queen City Oil) | Zapata | 3 | 26.8K | 48.9K | Jan 2018 – Jul 2026 |
| Cuellar, E. O-4-13657 | RMX Oil & Gas, LLC only | Jennings, W. (3000 Sand) | Zapata | 10 | 20K | 0 | Apr 2011 – Jul 2026 |
| Hinojosa, G. G. O-4-9789 | Block "T" Petroleum, Inc. only | Randado Ranch (Queen City) | Zapata | 7 | 16.2K | 3.82K | Jan 1993 – Jul 2026 |
| Cuellar, F. O-4-1304 | Zapata Oil Partners, L.L.C. only | Jennings, W. (3000 Sand) | Zapata | 22 | 14K | 1.1K | Jan 1993 – Jul 2026 |
| Trevino, E. O-4-724 | Energy 2000, Inc. only | Escobas | Zapata | 9 | 11.4K | 21 | Jan 1993 – Jul 2026 |
| Ramirez, Julian R., Est. -A- O-4-7194 | Finaly Resources LLC only | Edlasater, W. (Manila) | Zapata | 2 | 11K | 21 | Jan 1993 – Jul 2026 |
| Ramirez, Josefa, Etal O-4-6061 | Varas Energy Operating Company, only | Lopeno ( Queen City Oil) | Zapata | 2 | 10.1K | 29.7K | Jan 1993 – Jul 2026 |
| Chargos Creek "A" O-4-13593 | Zapata Oil Partners, L.L.C. only | Cuellar | Zapata | 2 | 6.02K | 0 | Feb 2010 – Jul 2026 |
| Cuellar,f. "a" Lease O-4-13303 | Pierco Energy Corp. only | Jennings, W. (3000 Sand) | Zapata | 12 | 5.14K | 1 | Apr 2005 – Jul 2026 |
| Bruni Min. Trust O-4-8052 | Killam Oil Co., Ltd. only | Blas Uribe (Rosenberg) | Zapata | 6 | 4.49K | 20 | Jan 1993 – Apr 2011 |
| J. D. Jennings O-4-13956 | Sue-Ann Operating, L.C. only | Jennings, W. (Queen City No. 10) | Zapata | 1 | 2.16K | 49 | Jan 2014 – Jul 2026 |
| Jennings, J. D. O-4-7871 | Sue-Ann Operating, L.C. only | Jennings, W. (Sparta) | Zapata | 28 | 1.65K | 737 | Jan 1993 – Jul 2026 |
| Jennings, J. D. O-4-6750 | S M K Energy Corporation only | Jennings, W. (Queen City NO 3) | Zapata | 2 | 838 | 6.62K | Jan 1993 – Nov 1995 |
| Jennings G-4-37148 | S M K Energy Corporation only | Jennings, West (Crockett) | Zapata | 1 | 0 | 0 | Jan 1993 – Jun 1994 |
| Jennings, J. D. G-4-38703 | Kovar Operating, LLC only | Jennings, West (Crockett) | Zapata | 1 | 0 | 15.5K | Jan 1993 – Aug 2019 |
| Jennings G-4-39785 | Kovar Operating, LLC only | Jennings, West (Crockett) | Zapata | 1 | 0 | 160K | Jan 1993 – Jan 2016 |
| Jennings G-4-41067 | Peoples Energy Prod.-TX, L.P. only | Jennings, West (Crockett) | Zapata | 1 | 0 | 5.65K | Jan 1993 – Mar 2006 |
| Bruni Est. GU G-4-51749 | Pennzoil Exploration & Prod. Co. only | Davis, S. ( Puig) | Zapata | 1 | 0 | 0 | Jan 1993 – Nov 1997 |
| Bruni Est. GU G-4-51767 | Pennzoil Exploration & Prod. Co. only | Davis, S. ( 4TH Hinnant) | Zapata | 1 | 0 | 0 | Jan 1993 – Aug 1994 |
| Haynes G-4-54669 | Pennzoil Exploration & Prod. Co. only | Comitas (8900) | Zapata | 1 | 0 | 0 | Jan 1993 – Oct 1997 |
| Haynes G-4-54670 | Pennzoil Exploration & Prod. Co. only | Comitas (9600) | Zapata | 1 | 0 | 0 | Jan 1993 – Oct 1997 |
| McCampbell, E.A. G-4-65065 | Altalay STX LLC only | Alworth(wilcox, Hinnant 1ST) | Zapata | 1 | 0 | 299K | Jan 1993 – Nov 2022 |
| Bruni Mineral Trust A-A G-4-69973 | Arete Operating Company II, LLC only | La Perla (Wilcox, Lower) | Zapata | 1 | 0 | 300K | Jan 1993 – Jul 2026 |
| Gutierrez "A" G-4-70650 | Westport Oil and Gas Company, LP only | Cinco de Mayo (2000) | Zapata | 1 | 0 | 0 | Jan 1993 – Jul 2005 |
| Yzaguirre, J. G-4-71016 | KCS Resources, Inc. only | Falcon (Wilcox 9500) | Zapata | 1 | 0 | 73.2K | Jan 1993 – Mar 1994 |
| Fulbright, J. E. G-4-71238 | Killam Oil Co., Ltd. only | Davis, S. (4800) | Zapata | 1 | 0 | 0 | Jan 1993 – Aug 2001 |
| Fulbright, J. E. G-4-71239 | Killam Oil Co., Ltd. only | Davis, S. (5500) | Zapata | 1 | 0 | 7.03K | Jan 1993 – Aug 2001 |
| Gutierrez "C" G-4-71356 | Coastal Oil & Gas Corporation only | Cinco de Mayo (2840) | Zapata | 1 | 0 | 0 | Jan 1993 – Jan 1997 |
| Jennings G-4-71653 | Sue-Ann Operating, L.C. only | Jennings (Pettus) | Zapata | 1 | 0 | 0 | Jan 1993 – Dec 2022 |
| La Perla G-4-71940 | Conoco Inc. only | La Perla (Lobo Cons.) | Zapata | 1 | 0 | 0 | Jan 1993 – May 2002 |
| Martinez, Lauro G-4-72247 | Bordertown Energy Resources, LLC only | Cisco-Benavides (Lobo Cons.) | Zapata | 1 | 0 | 1.8M | Jan 1993 – Jul 2026 |
| Fulbright, J. E. G-4-72438 | Killam Oil Co., Ltd. only | Davis, S. (5500) | Zapata | 1 | 0 | 1.07M | Jan 1993 – Jun 2011 |
| Sanchez, J. M. Estate G-4-72953 | Yates Operating Corp. only | M & F (Wilcox 5300) | Zapata | 1 | 0 | 0 | Jan 1993 – Apr 1994 |
| Cuellar G-4-72990 | Flores-San Miguel, Inc. only | Cuellar (1300) | Zapata | 1 | 0 | 0 | Jan 1993 – Dec 2007 |
| Laurel, S. L. G-4-73018 | Enerquest Operating L.L.C. only | J J & J (Wilcox 8800) | Zapata | 1 | 0 | 373K | Jan 1993 – Jul 2026 |
| Martinez, Eudoxio Gas Unit G-4-73452 | Bordertown Energy Resources, LLC only | Cisco-Benavides (Lobo Cons.) | Zapata | 1 | 0 | 4.13M | Jan 1993 – Jul 2026 |
| McCampbell, E. A. G-4-73529 | Altalay STX LLC only | Alworth(wilcox, Hinnant 1ST) | Zapata | 1 | 0 | 244K | Jan 1993 – Jul 2026 |
| Briones, J. E. G-4-73801 | Chevron U. S. A. Inc. only | Laredo (Lobo) | Zapata | 1 | 0 | 1.03K | Jan 1993 – Nov 1993 |