| Chalk, G. O. -D- O-10-41216 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 32 | 1.12M | 252K | Dec 2011 – Apr 2026 |
| Chalk-Duncan O-10-2720 | Conocophillips Company only | Howard Glasscock | Howard | 16 | 858K | 165K | Jan 1993 – Nov 2011 |
| Chalk, Otis O-10-18996 | Apache Corporation only | Howard-Glasscock (Glorieta) | Howard | 20 | 798K | 261K | Jan 1993 – Nov 2011 |
| Chalk, Otis O-10-19011 | Tradition Resources LLC only | Howard-Glasscock (Glorieta) | Howard | 28 | 738K | 243K | Jan 1993 – Nov 2011 |
| Chalk, G. O. -C- O-10-41213 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 26 | 736K | 111K | Dec 2011 – Apr 2026 |
| Chalk, Mary O-10-19033 | Conocophillips Company only | Howard-Glasscock (Glorieta) | Howard | 29 | 642K | 188K | Jan 1993 – Nov 2011 |
| Owen-Chalk O-10-41222 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 30 | 600K | 191K | Dec 2011 – Apr 2026 |
| Chalk, G. O. O-10-42240 | Grayrock Energy II, LLC only | Howard Glasscock (Consolidated) | Howard | 40 | 563K | 286 | Dec 2011 – Apr 2026 |
| Chalk, G. O. -C- O-10-18989 | Conocophillips Company only | Howard-Glasscock (Glorieta) | Howard | 13 | 560K | 29.4K | Jan 1993 – Nov 2011 |
| Chalk, G. O.-G- O-10-41220 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 38 | 496K | 140K | Dec 2011 – Apr 2026 |
| Chalk O-10-2805 | Legacy Reserves Operating LP only | Howard Glasscock | Howard | 33 | 491K | 37.8K | Jan 1993 – Nov 2011 |
| Chalk, Otis O-10-41051 | Unitex Oil & Gas, L.L.C. only | Howard Glasscock (Consolidated) | Howard | 42 | 481K | 26.6K | Dec 2011 – Apr 2026 |
| Chalk, G.O.-B- O-10-41211 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 13 | 436K | 89.6K | Dec 2011 – Apr 2026 |
| Chalk, G. O. -G- O-10-19031 | Conocophillips Company only | Howard-Glasscock (Glorieta) | Howard | 20 | 423K | 80.2K | Jan 1993 – Nov 2011 |
| Chalk, Otis O-10-2792 | Tradition Resources Oper, LLC only | Howard Glasscock | Howard | 50 | 410K | 226K | Jan 1993 – Nov 2011 |
| Chalk-B Duncan O-10-31901 | Conocophillips Company only | Howard-Glasscock (Glorieta) | Howard | 2 | 366K | 10.7K | Jan 1993 – Nov 2011 |
| Chalk,mary O-10-41221 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 37 | 366K | 130K | Dec 2011 – Apr 2026 |
| Chalk, G.O.-E- O-10-41219 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 24 | 321K | 91.6K | Dec 2011 – Apr 2026 |
| Chalk, G. O. -E- O-10-18991 | Conocophillips Company only | Howard-Glasscock (Glorieta) | Howard | 11 | 310K | 64.3K | Jan 1993 – Nov 2011 |
| Chalk, G. O. -B- O-10-22084 | Conocophillips Company only | Howard Glasscock (Clear Fork,mi) | Howard | 4 | 300K | 14.1K | Jan 1993 – Nov 2011 |
| Chalk, Otis O-10-46457 | Apache Corporation only | Howard Glasscock (Consolidated) | Howard | 23 | 297K | 71.6K | Dec 2011 – Apr 2026 |
| Chalk, G. O. -G- O-10-2762 | Conocophillips Company only | Howard Glasscock | Howard | 22 | 286K | 59.1K | Jan 1993 – Nov 2011 |
| Chalk -A- O-10-2749 | Cimarex Energy Co. of Colorado only | Howard Glasscock | Howard | 16 | 267K | 164K | Jan 1993 – Nov 2011 |
| Chalk, Otis /EO/ O-10-2727 | Cimarex Energy Co. of Colorado only | Howard Glasscock | Howard | 10 | 243K | 168K | Jan 1993 – Nov 2011 |
| Chalk, Sloan O-10-41223 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 18 | 243K | 86.7K | Dec 2011 – Apr 2026 |
| Chalk, G. O. -B- O-10-18988 | Conocophillips Company only | Howard-Glasscock (Glorieta) | Howard | 10 | 242K | 37.3K | Jan 1993 – Nov 2011 |
| Chalk, Sloan O-10-19035 | Conocophillips Company only | Howard-Glasscock (Glorieta) | Howard | 9 | 222K | 48.9K | Jan 1993 – Nov 2011 |
| Chalk, G. O. O-10-18986 | Conocophillips Company only | Howard-Glasscock (Glorieta) | Howard | 9 | 212K | 29.6K | Jan 1993 – Nov 2011 |
| Chalk, Mary O-10-2763 | Conocophillips Company only | Howard Glasscock | Howard | 30 | 212K | 108K | Jan 1993 – Nov 2011 |
| Chalk, G. O. O-10-2834 | Cimarex Energy Co. of Colorado only | Howard Glasscock | Howard | 21 | 211K | 13.6K | Jan 1993 – Nov 2011 |
| Chalk, G. O. -E- O-10-2689 | Conocophillips Company only | Howard Glasscock | Howard | 19 | 195K | 69.1K | Jan 1993 – Nov 2011 |
| Chalk O-10-41645 | Extex Operating Company only | Howard Glasscock (Consolidated) | Howard | 29 | 194K | 0 | Dec 2011 – Apr 2026 |
| Chalk -A- O-10-31394 | Excel Energy Co. only | Howard-Glasscock (Glorieta) | Howard | 8 | 188K | 152 | Jan 1993 – Nov 2011 |
| Chalk, G. O. O-10-19095 | Cimarex Energy Co. of Colorado only | Howard-Glasscock (Glorieta) | Howard | 12 | 185K | 7.85K | Jan 1993 – Nov 2011 |
| Chalk, G. O. -D- O-10-18990 | Conocophillips Company only | Howard-Glasscock (Glorieta) | Howard | 8 | 171K | 23.1K | Jan 1993 – Nov 2011 |
| Chalk O-10-19432 | Miranda Energy Corporation only | Howard Glasscock | Howard | 10 | 165K | 20 | Jan 1993 – Nov 2011 |
| Chalk, Otis O-10-2799 | Sahara Operating Company only | Howard Glasscock | Howard | 17 | 160K | 21 | Jan 1993 – Dec 2011 |
| Owen-Chalk O-10-2764 | Conocophillips Company only | Howard Glasscock | Howard | 27 | 158K | 37.8K | Jan 1993 – Nov 2011 |
| Chalk, G. O. -D- O-10-22055 | Conocophillips Company only | Howard Glasscock (Clear Fork,mi) | Howard | 5 | 157K | 7.1K | Jan 1993 – Nov 2011 |
| Chalk, G. O.-A- O-10-41210 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 10 | 156K | 52.7K | Dec 2011 – Apr 2026 |
| Chalk Estate O-10-19030 | Conocophillips Company only | Howard-Glasscock (Glorieta) | Howard | 9 | 153K | 17.2K | Jan 1993 – Nov 2011 |
| Chalk, Otis O-10-26950 | Keeley Oil, L.L.C. only | Howard-Glasscock (Glorieta) | Howard | 4 | 149K | 22 | Jan 1993 – Aug 2014 |
| Chalk, Sloan O-10-2765 | Conocophillips Company only | Howard Glasscock | Howard | 14 | 132K | 22.9K | Jan 1993 – Nov 2011 |
| Chalk, G. O. -F- O-10-41233 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 6 | 126K | 29.4K | Dec 2011 – Apr 2026 |
| Chalk -A- O-10-41129 | Sweet Crude Operating LLC only | Howard Glasscock (Consolidated) | Howard | 10 | 126K | 0 | Dec 2011 – Apr 2026 |
| Owen-Chalk O-10-19034 | Conocophillips Company only | Howard-Glasscock (Glorieta) | Howard | 13 | 122K | 21.2K | Jan 1993 – Nov 2011 |
| Chalk Estate O-10-41224 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 15 | 115K | 59.5K | Dec 2011 – Apr 2026 |
| Hyman-Chalk O-10-41243 | Citation Oil & Gas Corp. only | Howard Glasscock (Consolidated) | Howard | 9 | 100K | 67.8K | Dec 2011 – Apr 2026 |
| G.O. Chalk "F" O-10-33399 | Conocophillips Company only | Howard-Glasscock (Glorieta) | Howard | 3 | 95.2K | 14.8K | Jan 1993 – Nov 2011 |
| Chalk, Mary O-10-22065 | Conocophillips Company only | Howard Glasscock (Clear Fork,mi) | Howard | 6 | 94K | 22.1K | Jan 1993 – Nov 2011 |