| 133252 | Sep 11, 1981 | Sep 11, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Duval | Cuellar, Consuelo T. Estate #1 | 6,808 | 13135432 |
| 135430 | Sep 3, 1981 | Sep 3, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Zapata | Laurel, Angel R. #1 | 13,000 | 50531418 |
| 132457 | Sep 3, 1981 | Sep 3, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Zapata | Martinez, Mercurio et Al #2 | 11,500 | 50531413 |
| 132453 | Sep 3, 1981 | Sep 3, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Zapata | Laurel, Angel R. #2 | 13,500 | 50531412 |
| 130831 | Aug 24, 1981 | Aug 24, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Glasscock | Hillger, J.P. et Al #1 | 7,850 | 17331201 |
| 130625 | Aug 17, 1981 | Aug 17, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Vaquillas Ranch Ltd "A" #1 | 9,500 | 47933115 |
| 129216 | Aug 7, 1981 | Aug 7, 1981 | Sanchez-O'Brien Oil & Gas Corp. | San Patricio | Flinn, Horace G. et Al #1 | 9,500 | 40931485 |
| 127894 | Jul 28, 1981 | Jul 28, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Live Oak | Randall, John J. et Al #1 | 14,298 | 29732724 |
| 126908 | Jul 24, 1981 | Jul 24, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Stonewall | Page and Childress, Inc. #1 | 3,650 | 43331268 |
| 127599 | Jul 23, 1981 | Jul 23, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Duval | Salinas, Hermilo Jr #1 | 7,000 | 13133359 |
| 125715 | Jul 20, 1981 | Jul 20, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Duval | Garcia, Genaro #1 | 7,000 | 13133361 |
| 123519 | Jul 2, 1981 | Jul 2, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Live Oak | Bodden-Frost Gas Unit # 1 #1 | 12,500 | 29732067 |
| 121494 | Jun 17, 1981 | Jun 17, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Limestone | Wilson, N. A. #1 | 11,429 | 29330564 |
| 120122 | Jun 5, 1981 | Jun 5, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Hereford, L.M. #15 | 7,985 | 47932439 |
| 119871 | Jun 3, 1981 | Jun 3, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Zapata | Haynes Estate #1 | 13,000 | 50531372 |
| 118688 | May 20, 1981 | May 20, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Jasper | Brown, George W. #2 | 10,800 | 24130349 |
| 118397 | May 18, 1981 | May 18, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Nueces | Wright Trust #1 | 8,500 | 35530810 |
| 117047 | May 5, 1981 | May 5, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Glasscock | Hillger, Glenn W. "A" #1 | 8,000 | 17331152 |
| 116354 | Apr 29, 1981 | Apr 29, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Nueces | State Tract 100 #1 | 12,003 | 35531774 |
| 116128 | Apr 21, 1981 | Apr 21, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Nueces | Wright, Billy Gas Unit No. 1 #2 | 8,250 | 35531770 |
| 116127 | Apr 10, 1981 | Apr 10, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Zapata | Vaquillas Ranch Ltd. #1 | 13,500 | 50531363 |
| 114145 | Apr 7, 1981 | Apr 7, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Duval | Oliveira L.T. et Al #1-A | 5,512 | 13135187 |
| 114144 | Apr 7, 1981 | Apr 7, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Martin, S.J. #6-A | 11,500 | 47933002 |
| 113718 | Apr 1, 1981 | Apr 1, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Live Oak | Jones, B. M. #1 | 13,299 | 29732681 |
| 112988 | Mar 24, 1981 | Mar 24, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Martin, J.C. III #5 | 10,500 | 47932579 |
| 112892 | Mar 23, 1981 | Mar 23, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Live Oak | Crocker, Patricia P. #1 | 11,887 | 29732679 |
| 105135 | Mar 8, 1981 | Mar 8, 1981 | Sanchez-O'Brien Oil & Gas Corp. | San Patricio | Flinn, Horace G. Etal #1 | 9,500 | 40931485 |
| 111014 | Mar 5, 1981 | Mar 5, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Live Oak | George West Gas Unit 2 #3 | 10,000 | 29701152 |
| 110541 | Mar 3, 1981 | Mar 3, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Live Oak | Geffert Gas Unit #1 | 9,150 | 29731866 |
| 109444 | Feb 24, 1981 | Feb 24, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Irion | Tsrh #1-136 | 8,905 | 23531713 |
| 109442 | Feb 24, 1981 | Feb 24, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Irion | Sugg, Ella #1-100 | 8,778 | 23531712 |
| 109425 | Feb 24, 1981 | Feb 24, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Duval | Leedy, Clara H. #3 | 3,008 | 13135175 |
| 109424 | Feb 24, 1981 | Feb 24, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Zapata | Martinez, Mercurio et Al #1 | 12,500 | 50531350 |
| 110281 | Feb 23, 1981 | Feb 23, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Montgomery | Sabine Corp. #1 | 11,000 | 33930502 |
| 109219 | Feb 23, 1981 | Feb 23, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Live Oak | Brysch-Owens Gas Unit #1 #1 | 11,000 | 29732665 |
| 109123 | Feb 20, 1981 | Feb 20, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Live Oak | Brysch Gas Unit #2 #1 | 12,000 | 29732664 |
| 130739 | Feb 18, 1981 | Feb 18, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Olmitos Ranch Inc. #1 | 8,000 | 47932953 |
| 108726 | Feb 18, 1981 | Feb 18, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Live Oak | Bodden, Charles L. #6 | 12,000 | 29732661 |
| 107973 | Feb 9, 1981 | Feb 9, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Live Oak | Pawlik Gas Unit No. 1 #2 | 12,000 | 29732657 |
| 107880 | Feb 6, 1981 | Feb 6, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Nueces | Bernsen, Katherine M. et Al #1 | 7,350 | 35531722 |
| 107681 | Feb 5, 1981 | Feb 5, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Glasscock | Hillger, Glenn W. #1 | 8,000 | 17331122 |
| 107591 | Feb 5, 1981 | Feb 5, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Borden | Lott, John F. et. Al #1 | 8,760 | 03330653 |
| 107435 | Feb 4, 1981 | Feb 4, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Kaufman | Ferguson, Searcy M. Sr. #1 | 10,000 | 25730236 |
| 107390 | Feb 3, 1981 | Feb 3, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Martin, S. J. #2-A | 11,500 | 47932460 |
| 107335 | Feb 3, 1981 | Feb 3, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Nueces | Wright Trust #1 | 8,500 | 35530810 |
| 107334 | Feb 3, 1981 | Feb 3, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Olmitos Ranch, Inc #1 | 8,000 | 47932953 |
| 106861 | Jan 29, 1981 | Jan 29, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Live Oak | Godfrey-Brysch Gas Unit No. 2 #1 | 12,500 | 29732643 |
| 105431 | Jan 15, 1981 | Jan 15, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Calhoun | Hahn, A.W. #1 | 9,000 | 05731054 |
| 104982 | Jan 8, 1981 | Jan 8, 1981 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Olmitos Ranch, Inc. #2 | 7,500 | 47932933 |
| 104232 | Dec 31, 1980 | Dec 31, 1980 | Sanchez-O'Brien Oil & Gas Corp. | Duval | Heirs, J. F. Welder #1-70 | 14,500 | 13135125 |
| 103897 | Dec 31, 1980 | Dec 31, 1980 | Sanchez-O'Brien Oil & Gas Corp. | Calhoun | Davis, Nelson et Al #1 | 8,760 | 05731049 |
| 103900 | Dec 29, 1980 | Dec 29, 1980 | Sanchez-O'Brien Oil & Gas Corp. | De Witt | Daniels, Robert S. et Al #1 | 13,500 | 12331123 |
| 103007 | Dec 22, 1980 | Dec 22, 1980 | Sanchez-O'Brien Oil & Gas Corp. | Nueces | Thompson, Gaynell #1 | 6,012 | 35531688 |
| 100420 | Nov 25, 1980 | Nov 25, 1980 | Sanchez-O'Brien Oil & Gas Corp. | Nueces | Corzine Gas Unit No. 1 #1 | 9,500 | 35531436 |
| 94993 | Oct 8, 1980 | Oct 8, 1980 | Sanchez-O'Brien Oil & Gas Corp. | Jasper | Brown, George W. #1 | 10,806 | 24130340 |
| 94927 | Oct 3, 1980 | Oct 3, 1980 | Sanchez-O'Brien Oil & Gas Corp. | Live Oak | Rob.dougherty Slick Wlcx GS UT 1 #1 | 12,000 | 29732589 |
| 92797 | Sep 16, 1980 | Sep 16, 1980 | Sanchez-O'Brien Oil & Gas Corp. | Nueces | Massey, J. L. #1 | 9,725 | 35531445 |
| 91788 | Sep 8, 1980 | Sep 8, 1980 | Sanchez-O'Brien Oil & Gas Corp. | Andrews | Allbright, Frances McCollum #2 | 10,600 | 00332424 |
| 86930 | Jul 17, 1980 | Jul 17, 1980 | Sanchez-O'Brien Oil & Gas Corp. | Live Oak | Ponder-Gaddis Gas Unit No. 1 #1 | 11,000 | 29732517 |
| 84119 | Jun 17, 1980 | Jun 17, 1980 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Bruni Mineral Trust #2A | 12,000 | 47932764 |
| 78743 | Apr 18, 1980 | Apr 18, 1980 | Sanchez-O'Brien Oil & Gas Corp. | Live Oak | Clarke, Neville P. Gas Unit #1 #1 | 11,000 | 29732350 |
| 64089 | Nov 19, 1979 | Nov 19, 1979 | Sanchez-O'Brien Oil & Gas Corp. | Andrews | Anderson, Warren T. et Al #1 | 10,600 | 00332144 |
| 60498 | Oct 12, 1979 | Oct 12, 1979 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Martin, J. C. III #4 | 10,500 | 47932502 |
| 60084 | Oct 10, 1979 | Oct 10, 1979 | Sanchez-O'Brien Oil & Gas Corp. | Lavaca | Sparks, Mary Rouse #1 | 3,003 | 28531435 |
| 58741 | Sep 24, 1979 | Sep 24, 1979 | Sanchez-O'Brien Oil & Gas Corp. | Liberty | Buffum & Benning #1A | 9,500 | 29131322 |
| 57947 | Sep 14, 1979 | Sep 14, 1979 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Martin, S. J. #2A | 11,500 | 47932460 |
| 57888 | Sep 10, 1979 | Sep 10, 1979 | Sanchez-O'Brien Oil & Gas Corp. | Duval | Hoffman, Roger H. #1 | 6,769 | 13133907 |
| 56975 | Aug 29, 1979 | Aug 29, 1979 | Sanchez-O'Brien Oil & Gas Corp. | Live Oak | Cooper Gas Unit No. 1 #1 | 9,100 | 29732110 |
| 56295 | Aug 23, 1979 | Aug 23, 1979 | Sanchez-O'Brien Oil & Gas Corp. | Nueces | Massey, J. L. #1 | 10,000 | 35531445 |
| 55627 | Aug 15, 1979 | Aug 15, 1979 | Sanchez-O'Brien Oil & Gas Corp. | Glasscock | Kolb, Norma Jean #1 | 7,800 | 17331003 |
| 55407 | Aug 13, 1979 | Aug 13, 1979 | Sanchez-O'Brien Oil & Gas Corp. | Nueces | Flinn, J. E. et Al #1 | 10,000 | 35531443 |
| 55405 | Aug 13, 1979 | Aug 13, 1979 | Sanchez-O'Brien Oil & Gas Corp. | Zapata | San Fernando Minerals #1 | 11,000 | 50531120 |
| 54030 | Jul 31, 1979 | Jul 31, 1979 | Sanchez-O'Brien Oil & Gas Corp. | Nueces | Corzine Gas Unit No. 1 #1 | 9,500 | 35531436 |
| 53154 | Jul 18, 1979 | Jul 18, 1979 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Martin, S. J. #1A | 11,500 | 47932414 |
| 52650 | Jul 11, 1979 | Jul 11, 1979 | Sanchez-O'Brien Oil & Gas Corp. | Duval | Garcia. Estella et Al #2 | 7,000 | 13133623 |
| 52647 | Jul 11, 1979 | Jul 11, 1979 | Sanchez-O'Brien Oil & Gas Corp. | Duval | Garcia, Estella et Al #3 | 7,000 | 13133622 |
| 51681 | Jun 27, 1979 | Jun 27, 1979 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Martin, Sophie J. #2 | 10,500 | 47932393 |
| 49640 | May 29, 1979 | May 29, 1979 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Martin, J. C. III #3 | 10,000 | 47932375 |
| 47778 | May 3, 1979 | May 3, 1979 | Sanchez-O'Brien Oil & Gas Corp. | Duval | Garcia, Genaro #1 | 7,000 | 13133361 |
| 47777 | May 3, 1979 | May 3, 1979 | Sanchez-O'Brien Oil & Gas Corp. | Duval | Salinas, Hermilo Jr. #2 | 7,000 | 13133360 |
| 47776 | May 3, 1979 | May 3, 1979 | Sanchez-O'Brien Oil & Gas Corp. | Duval | Salinas, Hermilo Jr. #1 | 7,000 | 13133359 |
| 39359 | Dec 21, 1978 | Dec 21, 1978 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Villarreal, Alfredo Gas Unit #1 | 8,000 | 47932248 |
| 37385 | Nov 21, 1978 | Nov 21, 1978 | Sanchez-O'Brien Oil & Gas Corp. | Nueces | Wright, Billy et Al #1 | 7,874 | 35531349 |
| 37216 | Nov 20, 1978 | Nov 20, 1978 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Haynes, Robert G. Gas Unit #1 | 7,815 | 47932217 |
| 37146 | Nov 17, 1978 | Nov 17, 1978 | Sanchez-O'Brien Oil & Gas Corp. | Live Oak | Geffert Gas Unit #1 | 10,000 | 29731866 |
| 37029 | Nov 16, 1978 | Nov 16, 1978 | Sanchez-O'Brien Oil & Gas Corp. | Nueces | Cornelius, B. G. Const. Co. #1 | 7,212 | 35531345 |
| 37028 | Nov 16, 1978 | Nov 16, 1978 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Dryden, C. G. Gas Unit #1 | 8,000 | 47932215 |
| 37026 | Nov 16, 1978 | Nov 16, 1978 | Sanchez-O'Brien Oil & Gas Corp. | Jim Wells | Hoffman, Roger H. et al "G" #1 | 6,000 | 24930971 |
| 37025 | Nov 16, 1978 | Nov 16, 1978 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Jacaman, J. J. #3 | 6,850 | 47932214 |
| 37020 | Nov 16, 1978 | Nov 16, 1978 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Martin, J. C. III #2 | 10,000 | 47932213 |
| 37022 | Nov 15, 1978 | Nov 15, 1978 | Sanchez-O'Brien Oil & Gas Corp. | Duval | Garcia, Estella et Al #1 | 8,000 | 13132925 |
| 37018 | Nov 15, 1978 | Nov 15, 1978 | Sanchez-O'Brien Oil & Gas Corp. | Webb | Jacaman, J. J. #4 | 7,050 | 47932212 |
| 36746 | Nov 13, 1978 | Nov 13, 1978 | Sanchez-O'Brien Oil & Gas Corp. | Jackson | Sartwelle, J. D. et Al #1 | 8,638 | 23931353 |