| State of Texas - Slick #4 O-4-13053 | Marwell Petroleum Ltd Partnrship | Amore (Vicksburg 5750) | Starr | 1 | 3.23K | 3.13K | Sep 2001 – Jan 2003 |
| Vaughn G-2-164477 | Marwell Petroleum Ltd Partnrship | Jennie Bell (Yegua B) | De Witt | 1 | 3.19K | 521K | Aug 1997 – Oct 2011 |
| Smith-Pedigo GU G-2-294076 | Marwell Petroleum Ltd Partnrship | Kendall (Wilcox 8800) | Live Oak | 1 | 3.02K | 513K | Jan 2023 – May 2026 |
| El Gato "A" G-4-146839 | Marwell Petroleum Ltd Partnrship | Belle Jeffers, East (Lobo) | Webb | 1 | 2.93K | 746K | Aug 1993 – Jan 2004 |
| O'Hare et Al G-3-81704 | Marwell Petroleum Ltd Partnrship | Bernard, East (7700) | Wharton | 1 | 2.66K | 445K | by Jan 1993 – Aug 2026 |
| Wilkinson G-2-102450 | Marwell Petroleum Ltd Partnrship | Berclair, Northwest (Yegua 4700) | Goliad | 1 | 2.6K | 417K | by Jan 1993 – Apr 2015 |
| McClelland G-2-178941 | Marwell Petroleum Ltd Partnrship | Oakville (Wilcox Cons.) | Live Oak | 1 | 2.53K | 256K | May 2000 – Nov 2009 |
| Atkinson, Mary E. G-2-3970 | Marwell Petroleum Ltd Partnrship | Richard Adcock (5500) | Victoria | 1 | 1.96K | 584K | by Jan 1993 – Apr 2026 |
| McClelland "E" G-2-106843 | Marwell Petroleum Ltd Partnrship | Oakville (Wilcox Cons.) | Live Oak | 1 | 1.87K | 351K | by Jan 1993 – May 2024 |
| Jacobs, Matilda G-2-3431 | Marwell Petroleum Ltd Partnrship | Mission Valley, West (Massive-1) | Goliad | 1 | 1.73K | 186K | by Jan 1993 – Mar 2003 |
| Janik et Al G-3-80694 | Marwell Petroleum Ltd Partnrship | Bernard, East (7700) | Wharton | 1 | 1.6K | 417K | by Jan 1993 – Feb 2020 |
| Guerra, H.P. Jr et Al G-4-125458 | Marwell Petroleum Ltd Partnrship | Roma, W. (Queen City 5700) | Starr | 1 | 1.51K | 640K | by Jan 1993 – Feb 2023 |
| Ruschhaupt, W. H. Jr. -A- G-2-47992 | Marwell Petroleum Ltd Partnrship | Meyersville, East (8225) | De Witt | 1 | 1.42K | 250K | by Jan 1993 – Dec 2011 |
| Foster, Wm. C. G-2-85771 | Marwell Petroleum Ltd Partnrship | Mooney, E.(yegua 5450) | De Witt | 1 | 1.29K | 1.75M | by Jan 1993 – Aug 2026 |
| Bonorden-Clark Gas Unit G-2-3803 | Marwell Petroleum Ltd Partnrship | Provident City (Wilcox 8,600) | Lavaca | 1 | 1.06K | 518K | Dec 1993 – Nov 2019 |
| Martinez G-4-226605 | Marwell Petroleum Ltd Partnrship | Harry J. Mosser (5500) | Starr | 1 | 1.02K | 529K | Mar 2007 – Aug 2026 |
| El Gato "A" G-4-140274 | Marwell Petroleum Ltd Partnrship | Belle Pepper (Lobo 6) | Webb | 1 | 897 | 241K | by Jan 1993 – Jun 2007 |
| Cooley, M. E. et Al G-2-66509 | Marwell Petroleum Ltd Partnrship | Mission Valley, W. (Yegua 5000) | Victoria | 1 | 894 | 73K | by Jan 1993 – May 2011 |
| Seiler, Frieda G-2-111262 | Marwell Petroleum Ltd Partnrship | Arneckeville, S. (Y-6) | De Witt | 1 | 672 | 397K | by Jan 1993 – Jan 2013 |
| Gabriel, F. G. G-2-110525 | Marwell Petroleum Ltd Partnrship | Richie (4150) | Goliad | 1 | 473 | 855K | Jun 1994 – Jul 2014 |
| Villarreal-Gutierrez GU G-4-144261 | Marwell Petroleum Ltd Partnrship | Urebeno, South (Wilcox 7000) | Zapata | 1 | 453 | 1.22M | Feb 1993 – Aug 2026 |
| JMK #1 G-4-173247 | Marwell Petroleum Ltd Partnrship | Amore (Vicksburg 5950) | Starr | 1 | 451 | 364K | May 1999 – Mar 2011 |
| Reilly Gas Unit G-4-109604 | Marwell Petroleum Ltd Partnrship | Reilly (Vicksburg) | Starr | 1 | 357 | 628K | by Jan 1993 – Jan 2017 |
| Hidalgo-Willacy Unit G-4-10247 | Marwell Petroleum Ltd Partnrship | Elsa, South (Frio Consolidated) | Hidalgo | 1 | 278 | 311K | by Jan 1993 – Jul 2007 |
| State of Texas-Slick #4 G-4-194673 | Marwell Petroleum Ltd Partnrship | Amore (Gayle Vksbg. 5510) | Starr | 1 | 273 | 147K | Apr 2003 – Sep 2016 |
| De Los Santos Gas Unit 1 G-4-129646 | Marwell Petroleum Ltd Partnrship | Haynes (Middle Wilcox Cons.) | Zapata | 1 | 160 | 1.18M | by Jan 1993 – Aug 2026 |
| Holt, B. D. G-2-163802 | Marwell Petroleum Ltd Partnrship | Hordes Creek (3100) | Goliad | 1 | 104 | 253K | Mar 1997 – Mar 2002 |
| Al-Martinez State #1 G-4-162690 | Marwell Petroleum Ltd Partnrship | La Copita (Vicksburg Cons.) | Starr | 1 | 78 | 351K | Jan 1997 – Mar 2011 |
| Wilson G-3-210165 | Marwell Petroleum Ltd Partnrship | New Taiton (Frio 4600) | Wharton | 1 | 75 | 252K | Jun 2005 – Oct 2011 |
| Villarreal, Ricardo G-4-146157 | Marwell Petroleum Ltd Partnrship | Urebeno, South (Wilcox 7000) | Zapata | 1 | 64 | 2.51M | Aug 1993 – Aug 2026 |
| Sugarek G-2-167203 | Marwell Petroleum Ltd Partnrship | Yougeen, South (3800) | Bee | 1 | 40 | 59.1K | Sep 1997 – Aug 1998 |
| Palafox '21' G-4-86324 | Marwell Petroleum Ltd Partnrship | Las Tiendas (Olmos) | Webb | 1 | 36 | 61.8K | by Jan 1993 – Jun 2011 |
| Reilly Gas Unit G-4-93833 | Marwell Petroleum Ltd Partnrship | Reilly (Vicksburg) | Starr | 1 | 26 | 159K | by Jan 1993 – Jun 2014 |
| Yackel G-3-229723 | Marwell Petroleum Ltd Partnrship | Jones Creek (4850) | Wharton | 1 | 22 | 105K | Apr 2007 – May 2009 |
| Sugarek G-2-170980 | Marwell Petroleum Ltd Partnrship | Yougeen (Frio 3610) | Bee | 1 | 10 | 288K | Sep 1998 – Aug 2013 |
| Griffith & Assoc. -A- G-2-92660 | Marwell Petroleum Ltd Partnrship | Papalote, West (4120) | San Patricio | 1 | 8 | 291K | by Jan 1993 – Jun 2011 |
| Hines, E. A. G-2-98055 | Marwell Petroleum Ltd Partnrship | Mountain View, NE. (6800) | Live Oak | 1 | 4 | 4 | by Jan 1993 – Feb 1993 |
| De Los Santos Gas Unit 1 G-4-130143 | Marwell Petroleum Ltd Partnrship | Haynes (Middle Wilcox Cons.) | Zapata | 1 | 2 | 52.4K | by Jan 1993 – Sep 2004 |
| Heard, Georgie G-2-90959 | Marwell Petroleum Ltd Partnrship | Georgie Heard (3700) | Bee | 1 | 1 | 66.5K | by Jan 1993 – Sep 1995 |
| Thomson, Laura B. "B" G-2-139081 | Marwell Petroleum Ltd Partnrship | Heard Ranch (3900) | Bee | 1 | 0 | 251K | by Jan 1993 – Jun 2003 |
| Thomson, Laura D. "B" G-2-136457 | Marwell Petroleum Ltd Partnrship | Heard Ranch (4400) | Bee | 1 | 0 | 501K | by Jan 1993 – May 2013 |
| Hidalgo Willacy Unit G-4-51037 | Marwell Petroleum Ltd Partnrship | Elsa, South (Frio Consolidated) | Hidalgo | 1 | 0 | 0 | — |
| Crow G-2-119307 | Marwell Petroleum Ltd Partnrship | Circle -B- (4820) | Goliad | 1 | 0 | 289K | by Jan 1993 – May 2012 |
| Wofford - E - G-4-56366 | Marwell Petroleum Ltd Partnrship | Agua Dulce | Nueces | 1 | 0 | 107K | by Jan 1993 – Jun 2004 |
| Hilbrich-Seller G-2-92726 | Marwell Petroleum Ltd Partnrship | McCaskill (Wilcox Slick 7400) | Karnes | 1 | 0 | 0 | — |
| Janik et Al G-3-79186 | Marwell Petroleum Ltd Partnrship | Bernard, East (7600) | Wharton | 1 | 0 | 0 | — |
| Gutierrez "B" G-4-76737 | Marwell Petroleum Ltd Partnrship | Cinco de Mayo (1250) | Zapata | 1 | 0 | 215K | by Jan 1993 – Jun 2013 |
| Heard, Georgie G-2-90958 | Marwell Petroleum Ltd Partnrship | Georgie Heard (3500) | Bee | 1 | 0 | 462K | by Jan 1993 – Jun 2009 |
| Cooley, M. E. G-2-88600 | Marwell Petroleum Ltd Partnrship | Mission Valley, W. (1350 Stray) | Victoria | 1 | 0 | 36.2K | by Jan 1993 – Dec 2008 |
| Jacob, Matilda G-2-79247 | Marwell Petroleum Ltd Partnrship | Mission Valley, W.(miocene 1350) | Goliad | 1 | 0 | 100K | by Jan 1993 – May 2011 |