| Yturria G-4-212817 | Texas Oil and Gas Operating, LLC | La Sara, NE (7200) | 1 | 0 | 298K | Nov 2005 – Dec 2007 |
| Yturria G-4-212234 | Texas Oil and Gas Operating, LLC | La Sara, NE (7200) | 1 | 0 | 84.9K | Nov 2005 – May 2006 |
| Kleberg, R J Jr TR Stillman G-4-254943 | EOG Resources, Inc. | Tordilla (Deep Cons.) | 1 | 0 | 184K | Mar 2010 – Jan 2014 |
| Yturria G-4-141920 | Hanson Minerals Co. | Lago del Ocelot (Frio 12,150) | 1 | 0 | 0 | — |
| Kleberg, R. J. Jr. Tr. Stillman G-4-255091 | EOG Resources, Inc. | Wildcat | 1 | 0 | 0 | — |
| Yturria Cattle Co. G-4-108838 | Ffa Petroleum Services | La Sara, N. (Jones SD) | 1 | 0 | 58.7K | by Jan 1993 – Nov 1994 |
| Kleberg, R J Jr TR Stillman Past G-4-208667 | Exxon Mobil Corporation | Tordilla (M-10) | 1 | 0 | 4.53K | Nov 2004 – Nov 2004 |
| Kleberg, R J Jr TR Stillman Pas G-4-206554 | Exxon Mobil Corporation | Tordilla (L-27) | 1 | 0 | 508K | May 2004 – Apr 2006 |
| Palousek, et al GU G-4-256326 | Suemaur Expl. & Prod., LLC | Wildcat | 1 | 0 | 0 | — |
| Bell, S. H. 'B' G-4-142080 | Exxon Corp. | Willamar (Graben 6140) | 1 | 0 | 0 | — |
| Petru, V. A. G-4-205738 | Safari Production Company, Inc. | Wildcat | 1 | 0 | 0 | — |
| Yturria G-4-257335 | Texas Oil and Gas Operating, LLC | Wildcat | 1 | 0 | 0 | — |
| Yturria G-4-257433 | Texas Oil and Gas Operating, LLC | Wildcat | 1 | 0 | 0 | — |
| Kleberg, R J Jr TR Stillman G-4-205657 | EOG Resources, Inc. | Tordilla-NC (L-27E) | 1 | 0 | 4.27M | Sep 2004 – May 2008 |
| Sauz Ranch Mulatos Pasture G-4-203104 | Flint Oak Energy, LLC | Wildcat | 1 | 0 | 0 | — |
| Kleberg, R J Jr TR Stillman G-4-258366 | EOG Resources, Inc. | Tordilla (Deep Cons.) | 1 | 0 | 53.9K | Nov 2010 – Jul 2015 |
| Kleberg, R J Jr TR Stillman G-4-258846 | EOG Resources, Inc. | Tordilla (Deep Cons.) | 1 | 0 | 81K | Oct 2010 – Dec 2010 |
| Kleberg, R J Jr TR Stillman G-4-260272 | EOG Resources, Inc. | Tordilla (M-10) | 1 | 0 | 0 | — |
| Yturria G-4-260766 | Texas Oil and Gas Operating, LLC | Wildcat | 1 | 0 | 0 | — |
| Kleberg, R J Jr TR Stillman G-4-260802 | EOG Resources, Inc. | Wildcat | 1 | 0 | 0 | — |
| Yturria Cattle Co. G-4-108660 | Petroleum Management, Inc. | Lacal (D-4) | 1 | 0 | 0 | — |
| Pinnell, H. P. G-4-261199 | Lighthouse Operating, Inc. | Arroyo Colorado, North (E-4) | 1 | 0 | 79.1K | Mar 2011 – Apr 2012 |
| Armendaiz, et Al G-4-142585 | Mueller Engineering Corp. | Arroyo Colorado (C-2) | 1 | 0 | 117K | by Jan 1993 – Oct 1994 |
| Yturria G-4-262172 | Texas Oil and Gas Operating, LLC | La Sara, N. (7400) | 1 | 0 | 0 | — |
| Luitjen G-4-262188 | Wagner Oil Company | Wildcat | 1 | 0 | 0 | — |
| Kenaf Industries Unit G-4-198900 | U.S. Enercorp, Ltd. | La Sara, S. (2400) | 1 | 0 | 515K | Oct 2003 – Jun 2005 |
| Kenaf Industries Unit G-4-198895 | U.S. Enercorp, Ltd. | La Sara, S. (2400) | 1 | 0 | 1.21M | Oct 2003 – Sep 2007 |
| Yturria G-4-262919 | Risco la Sara Operations, LLC | Wildcat | 1 | 0 | 0 | — |
| Morrow G-4-263160 | Wagner Oil Company | Wildcat | 1 | 0 | 0 | — |
| Yturria, Frank D. G-4-197411 | El Paso Production Oil & Gas Co. | Wildcat | 1 | 0 | 0 | — |
| Yturria G-4-263515 | Texas Oil and Gas Operating, LLC | Wildcat | 1 | 0 | 0 | — |
| Raymondville SWD G-4-264481 | Trinity Environmental Swd,l.l.c | La Sara, S. (2400) | 1 | 0 | 0 | — |
| Captain Fraser #1 Unit G-4-264535 | Panther Bayou Energy, LLC | Wildcat | 1 | 0 | 0 | — |
| Tordilla Field Gas Unit 1 G-4-265105 | EOG Resources, Inc. | Wildcat | 1 | 0 | 0 | — |
| Kleberg, R. J. Jr. Tr. Stillman G-4-196621 | Exxon Mobil Corporation | Tordilla (I-67, S) | 1 | 0 | 0 | — |
| Hargill Gas Unit 'B' G-4-267375 | Dallas Petroleum Group, LLC | Wildcat | 1 | 0 | 0 | — |
| Kleberg, R. J. Jr. Tr. Stillman G-4-196211 | Exxon Mobil Corporation | Tordilla-NC (K-45, W) | 1 | 0 | 1.34M | Feb 2001 – Oct 2002 |
| Kleberg, R. J. Jr. Tr. Stillman G-4-196177 | Exxon Mobil Corporation | Wildcat | 1 | 0 | 0 | — |
| Bucy G-4-195754 | Citation Oil & Gas Corp. | Willamar, West (SM-4100) | 1 | 0 | 4.98K | May 2003 – Sep 2003 |
| Yturria G-4-269339 | Texas Oil and Gas Operating, LLC | La Sara (No. 8 Sand) | 1 | 0 | 0 | — |
| Tordilla Field Gas Unit 1 G-4-269485 | EOG Resources, Inc. | Tordilla (L-43) | 1 | 0 | 402 | Feb 2013 – Sep 2013 |
| Kleberg, R. J. Jr. Tr. Stillman G-4-195715 | Exxon Mobil Corporation | Tordilla (I-67, S) | 1 | 0 | 0 | — |
| Yturria G-4-270601 | Risco la Sara Operations, LLC | La Sara, E. (8500) | 1 | 0 | 0 | — |
| El Sauz Ranch Nopal G-4-108249 | Pinnell, H. P. Trustee | Arroyo Colorado (E-4B) | 1 | 0 | 0 | — |
| Kleberg, R. J. Jr. Tr. Stillman G-4-195483 | Exxon Mobil Corporation | Tordilla-NC (L-90E) | 1 | 0 | 1.21K | Jul 2003 – Jul 2003 |
| Bucy G-4-195295 | Citation Oil & Gas Corp. | Willamar West (Miocene 4700) | 1 | 0 | 210K | Jun 2003 – Mar 2005 |
| Kenaf Industries G-4-194262 | U.S. Enercorp, Ltd. | La Sara, S. (2400) | 1 | 0 | 1.98M | Mar 2003 – Jun 2010 |
| Yturria G-4-273523 | Texas Oil and Gas Operating, LLC | La Sara, E. (8200) | 1 | 0 | 0 | — |
| Kleberg, R. J. Jr Tr. Stillman G-4-194251 | Exxon Mobil Corporation | Tordilla-NC (K-45, E) | 1 | 0 | 6.49K | Mar 2003 – Aug 2003 |
| Kleberg, R.J. Jr. Tr. Stillman G-4-193930 | Exxon Mobil Corporation | Tordilla (J-55) | 1 | 0 | 0 | — |