| 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 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 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 | 56.5K | 849K | Feb 2008 – Jul 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 Ranch G-4-225042 | Decker Operating Co., L.L.C. only | Mobil-David (Howell Hight) | Nueces | 1 | 42.2K | 1.42M | Jan 2007 – Jun 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 Ranch C G-4-262707 | Apache Corporation only | Mobil-David (Anderson) | Nueces | 1 | 35.9K | 2.07M | Sep 2011 – Feb 2012 |
| Chapman Ranch G-4-213210 | Apache Corporation only | Mobil-David (Frio 12,600) | Nueces | 1 | 31.6K | 1.22M | Jun 2005 – Dec 2010 |
| 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 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 G-4-208731 | Apache Corporation only | Mobil-David (Frio 12,600) | Nueces | 1 | 18.5K | 1.77M | Oct 2004 – Dec 2010 |
| 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 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 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 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 |
| Chapman Ranch G-4-209638 | Apache Corporation only | Mobil-David (Frio 12,600) | Nueces | 1 | 9.57K | 908K | Jan 2005 – Dec 2010 |
| Chapman Ranch "B" G-4-194740 | Decker Operating Co., L.L.C. only | Chapman Ranch (9650) | Nueces | 1 | 9.49K | 761K | Apr 2003 – Jun 2007 |
| Chapman Ranch G-4-234655 | Urban Oil & Gas Group, LLC only | Mobil-David (Frio 12,600) | Nueces | 1 | 8.99K | 362K | Jan 2008 – Aug 2019 |
| Chapman Ranch C G-4-259277 | Apache Corporation only | Mobil-David (Frio 12,600) | Nueces | 1 | 7.93K | 287K | Oct 2010 – Jan 2011 |
| Chapman, J. O. G-4-180214 | Shana Petroleum Company only | Chapman Ranch (A) | Nueces | 1 | 6.53K | 343K | Nov 2000 – Jan 2002 |
| Chapman Ranch G-4-233135 | Apache Corporation only | Mobil-David (Frio 12,600) | Nueces | 1 | 6.49K | 330K | Nov 2007 – Dec 2010 |
| Chapman, J.O. G-4-149677 | Royal Production Company, Inc. only | Chapman Ranch (7130) | Nueces | 1 | 5.13K | 63.8K | Apr 1994 – Nov 1994 |
| Chapman Ranch G-4-215025 | Urban Oil & Gas Group, LLC only | Mobil-David (Frio 12,600) | Nueces | 1 | 4.24K | 55.9K | Oct 2005 – Oct 2019 |
| Chapman Ranch -B- G-4-73714 | Urban Oil & Gas Group, LLC only | Mobil-David (Howell Hight) | Nueces | 1 | 4.12K | 278K | Feb 1993 – Aug 2019 |
| Chapman Ranch G-4-247940 | Urban Oil & Gas Group, LLC only | Mobil-David (Frio 12,600) | Nueces | 1 | 3.98K | 488K | Dec 2007 – May 2014 |
| Chapman Ranch G-4-234945 | Decker Operating Co., L.L.C. only | Mobil-David (Howell Hight) | Nueces | 1 | 3.94K | 132K | Nov 2007 – Oct 2014 |
| Chapman Ranch G-4-152381 | Neg Operating LLC only | Chapman Ranch (8600) | Nueces | 1 | 3.3K | 95.5K | Nov 1994 – Apr 1997 |
| Chapman Ranch G-4-261596 | Decker Operating Co., L.L.C. only | Chapman Ranch (Catahoula Cons.) | Nueces | 1 | 2.76K | 93.6K | May 2011 – Aug 2019 |
| Chapman Ranch G-4-234051 | Urban Oil & Gas Group, LLC only | Mobil-David (Frio 12,600) | Nueces | 1 | 2.56K | 237K | Oct 2007 – Dec 2010 |
| Crawford G-4-201945 | Kaler Energy Corp. only | Chapman Ranch (9650) | Nueces | 1 | 2.31K | 235K | Feb 2004 – Nov 2004 |
| Chapman Ranch G-4-247512 | Decker Operating Co., L.L.C. only | Chapman Ranch (Upper Frio Cons.) | Nueces | 1 | 2.05K | 26.5K | Oct 2008 – Apr 2012 |
| Chapman Ranch G-4-216702 | Omega Energy, LLC only | Mobil-David (Anderson) | Nueces | 1 | 2.02K | 95.5K | May 2005 – Sep 2006 |
| Chapman, J. O. G-4-168653 | Shana Petroleum Company only | Chapman Ranch (5600) | Nueces | 1 | 1.98K | 61K | Apr 1998 – Nov 1999 |
| Chapman, J.O. G-4-208726 | Crest Resources, Inc. only | Chapman Ranch | Nueces | 1 | 1.91K | 180K | Sep 2004 – Nov 2013 |
| Chapman, J.O. G-4-119922 | Decker Operating Co., L.L.C. only | Chapman Ranch (Miocene Cons.) | Nueces | 1 | 1.82K | 78.1K | by Jan 1993 – Jan 2003 |
| Chapman G-4-281644 | Western Gulf Oil & Gas, LLC only | Chapman Ranch (Mid. Frio Cons.) | Nueces | 1 | 1.62K | 48.1K | Sep 2016 – Feb 2019 |
| Chapman, J. O. G-4-168216 | Neg Operating LLC only | Chapman Ranch (4950, South) | Nueces | 1 | 1.38K | 64.7K | Apr 1998 – Dec 2002 |
| Chapman, J. O. G-4-169700 | Shana Petroleum Company only | Chapman Ranch (7400) | Nueces | 1 | 1.05K | 17.9K | Jul 1998 – Feb 1999 |
| Chapman Ranch G-4-243891 | Decker Operating Co., L.L.C. only | Chapman Ranch (Anderson, Lo.) | Nueces | 1 | 625 | 36.9K | Nov 2008 – Apr 2011 |