| Chapman Ranch G-4-190455 | Proline Energy Resources Inc only | Mobil-David (Anderson) | Nueces | 1 | 202K | 3.79M | Jul 2002 – Dec 2010 |
| Chapman Ranch C G-4-259450 | Proline Energy Resources Inc only | Mobil-David (Anderson) | Nueces | 1 | 191K | 11.8M | Feb 2011 – Feb 2020 |
| Chapman O-4-13410 | Sun Exploration, Inc. only | Chapman Ranch (Upper Frio Cons.) | Nueces | 6 | 177K | 22.3K | Nov 2006 – Jan 2026 |
| Chapman Ranch G-4-214728 | Urban Oil & Gas Group, LLC only | Mobil-David (Frio 12,600) | Nueces | 1 | 134K | 6.15M | Aug 2005 – Apr 2010 |
| Chapman Ranch "A" G-4-227943 | Decker Operating Co., L.L.C. only | Mobil-David (Howell Hight) | Nueces | 1 | 123K | 1.66M | Feb 2007 – Sep 2025 |
| Chapman JO D O-4-13547 | Decker Operating Co., L.L.C. only | Chapman Ranch (Upper Frio Cons.) | Nueces | 1 | 101K | 18.9K | Nov 2006 – Mar 2026 |
| Chapman Ranch G-4-201649 | Apache Corporation only | Chapman Ranch (Upper Frio Cons.) | Nueces | 1 | 79.1K | 888K | Apr 2004 – Dec 2010 |
| Chapman Ranch G-4-232247 | Decker Operating Co., L.L.C. only | Mobil-David (Howell Hight) | Nueces | 1 | 59.1K | 1.47M | Jul 2007 – Apr 2012 |
| Chapman Ranch G-4-235046 | Decker Operating Co., L.L.C. only | Mobil-David (Howell Hight) | Nueces | 1 | 56.4K | 849K | Feb 2008 – Mar 2026 |
| Chapman G-4-249353 | Ventex Operating Corp. only | Chapman Ranch (Upper Frio Cons.) | Nueces | 1 | 51.9K | 68.8K | Feb 2009 – Sep 2024 |
| Chapman O-4-13088 | Carter Exploration Company only | Chapman Ranch (C-10) | Nueces | 1 | 47.5K | 5.8K | May 2002 – Mar 2006 |
| Chapman O-4-12180 | Sun Exploration, Inc. only | Chapman Ranch (C-22) | Nueces | 1 | 44.6K | 6.87K | Mar 1993 – May 2002 |
| Chapman Ranch G-4-225042 | Decker Operating Co., L.L.C. only | Mobil-David (Howell Hight) | Nueces | 1 | 42.1K | 1.42M | Jan 2007 – Feb 2026 |
| Chapman Ranch C G-4-219755 | Apache Corporation only | Mobil-David (Frio 12,600) | Nueces | 1 | 40.1K | 1.84M | May 2006 – May 2011 |
| Chapman Ranch G-4-266597 | Apache Corporation only | Mobil-David (Anderson) | Nueces | 1 | 37.3K | 741K | Jun 2012 – Oct 2012 |
| Chapman O-4-8765 | Carter Exploration Company only | Chapman Ranch (C-19) | Nueces | 1 | 37K | 3.89K | Jan 1993 – Oct 1999 |
| Chapman Ranch C G-4-262707 | Apache Corporation only | Mobil-David (Anderson) | Nueces | 1 | 35.9K | 2.07M | Sep 2011 – Feb 2012 |
| Chapman O-4-8911 | Carter Exploration Company only | Chapman Ranch (F-31) | Nueces | 1 | 31.7K | 3.99K | Jan 1993 – Sep 2000 |
| Chapman Ranch G-4-213210 | Apache Corporation only | Mobil-David (Frio 12,600) | Nueces | 1 | 31.6K | 1.22M | Jun 2005 – Dec 2010 |
| Chapman, J. O. O-4-13553 | Decker Operating Co., L.L.C. only | Chapman Ranch (Upper Frio Cons.) | Nueces | 1 | 31.1K | 3.75K | Apr 2009 – Mar 2021 |
| Chapman O-4-13152 | Carter Exploration Company only | Chapman Ranch (5600) | Nueces | 1 | 30.3K | 3.09K | May 2003 – Oct 2006 |
| Chapman O-4-13089 | Carter Exploration Company only | Chapman Ranch (First Het) | Nueces | 2 | 29.7K | 3.13K | Apr 2002 – Oct 2006 |
| Chapman J. O. O-4-12911 | Decker Operating Co., L.L.C. only | Chapman Ranch (5600) | Nueces | 2 | 28.5K | 65K | Dec 1999 – Oct 2006 |
| Chapman O-4-11594 | Carter Exploration Company only | Chapman Ranch (Fourth Het) | Nueces | 2 | 27.7K | 4.37K | Jan 1993 – Oct 2004 |
| Chapman, J.O. "C" O-4-13397 | Decker Operating Co., L.L.C. only | Chapman Ranch (Catahoula Cons.) | Nueces | 1 | 26.8K | 35.9K | May 2007 – Dec 2015 |
| Chapman Ranch O-4-5608 | Decker Operating Co., L.L.C. only | Chapman Ranch, E. (Davis) | Nueces | 5 | 25.7K | 23 | Feb 1993 – Jul 2004 |
| Chapman Ranch G-4-209197 | Urban Oil & Gas Group, LLC only | Mobil-David (Howell Hight) | Nueces | 1 | 25K | 487K | Mar 2005 – Dec 2010 |
| Chapman Ranch G-4-209814 | Apache Corporation only | Mobil-David (Frio 12,600) | Nueces | 1 | 23.7K | 1.01M | Apr 2005 – Dec 2010 |
| Chapman, J. D. O-4-8585 | Neg Operating LLC only | Chapman Ranch (0-14) | Nueces | 3 | 23K | 8.75K | Jan 1993 – Feb 1995 |
| Chapman Ranch G-4-207096 | Urban Oil & Gas Group, LLC only | Mobil-David (Frio 12,600) | Nueces | 1 | 22.5K | 1.77M | Aug 2004 – May 2016 |
| Chapman Ranch -B- O-4-8644 | Decker Operating Co., L.L.C. only | Chapman Ranch (5600) | Nueces | 1 | 20.1K | 24 | Jan 1993 – Oct 2006 |
| Chapman, J. O. O-4-447 | Decker Operating Co., L.L.C. only | Chapman Ranch (C- 3) | Nueces | 5 | 19K | 31K | Jan 1993 – Oct 2006 |
| Chapman Ranch G-4-208731 | Apache Corporation only | Mobil-David (Frio 12,600) | Nueces | 1 | 18.5K | 1.77M | Oct 2004 – Dec 2010 |
| Chapman, J.O. O-4-12711 | Neg Operating LLC only | Chapman Ranch (4950, South) | Nueces | 1 | 18.1K | 59.4K | Sep 1997 – Dec 2002 |
| Chapman O-4-13173 | Ventex Operating Corp. only | Chapman Ranch (7000) | Nueces | 1 | 17.6K | 44.1K | Aug 2003 – Oct 2006 |
| Chapman Ranch "B" G-4-199951 | Decker Operating Co., L.L.C. only | Chapman Ranch (9650) | Nueces | 1 | 16.9K | 1.22M | Nov 2003 – Mar 2016 |
| Chapman, J. O. O-4-8148 | Neg Operating LLC only | Chapman Ranch (5600) | Nueces | 4 | 15.4K | 22.6K | Jan 1993 – Feb 2001 |
| Chapman Ranch, J. O. "D" O-4-13389 | Decker Operating Co., L.L.C. only | Chapman Ranch (6260) | Nueces | 1 | 14.8K | 2.51K | Jul 2006 – Oct 2006 |
| Chapman Ranch G-4-197910 | Proline Energy Resources Inc only | Mobil-David (Anderson) | Nueces | 1 | 14.5K | 346K | May 2003 – Dec 2003 |
| Chapman Ranch G-4-231911 | Proline Energy Resources Inc only | Mobil-David (Frio 12,600) | Nueces | 1 | 14.3K | 869K | Aug 2007 – Aug 2019 |
| Chapman, J.O. O-4-11625 | Shell Western E&P Inc. only | Chapman Ranch (Fourth Het) | Nueces | 1 | 13.9K | 6.12K | Apr 1995 – Mar 1997 |
| Chapman J.O. O-4-13423 | Decker Operating Co., L.L.C. only | Chapman Ranch (Catahoula Cons.) | Nueces | 9 | 13.5K | 20.7K | Nov 2006 – Dec 2015 |
| Chapman, J. O. O-4-12906 | Decker Operating Co., L.L.C. only | Chapman Ranch (6600) | Nueces | 1 | 12.9K | 5.33K | Feb 2000 – Nov 2004 |
| Chapman Ranch G-4-215831 | Urban Oil & Gas Group, LLC only | Mobil-David (Frio 12,600) | Nueces | 1 | 12.5K | 235K | Jan 2006 – Dec 2010 |
| Chapman Ranch G-4-235060 | Decker Operating Co., L.L.C. only | Mobil-David (Frio 12,600) | Nueces | 1 | 11.1K | 682K | Jan 2008 – Jan 2009 |
| Chapman Ranch G-4-230045 | Decker Operating Co., L.L.C. only | Mobil-David (Howell Hight) | Nueces | 1 | 10.6K | 711K | Aug 2007 – Apr 2012 |
| Chapman, J. O. O-4-7598 | Decker Operating Co., L.L.C. only | Chapman Ranch (C- 5) | Nueces | 2 | 10.3K | 4.32K | Jan 1993 – Mar 1996 |
| Chapman Ranch G-4-276142 | Decker Operating Co., L.L.C. only | Chapman Ranch (Upper Frio Cons.) | Nueces | 1 | 10.1K | 273K | Jan 2015 – Sep 2016 |
| Chapman Ranch G-4-221355 | Decker Operating Co., L.L.C. only | Mobil-David (Howell Hight) | Nueces | 1 | 10.1K | 319K | Apr 2006 – Oct 2013 |
| Chapman Ranch G-4-173989 | Decker Operating Co., L.L.C. only | Chapman Ranch, S. (Mass. 4700) | Nueces | 1 | 10.1K | 489K | Apr 1999 – Jul 2002 |