| Sengelmann-Teinert O-3-21351 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Fayette | 1 | 37.2K | 74.5K | by Jan 1993 – Feb 1998 |
| Yelderman-Bredthauer Unit G-3-142127 | Union Pacific Resources Company | Giddings (Austin Chalk, Gas) | Washington | 1 | 36.7K | 707K | by Jan 1993 – Sep 2000 |
| Warrenton Amarado Unit G-3-147182 | Union Pacific Resources Company | Giddings (Austin Chalk, Gas) | Fayette | 1 | 36.2K | 1.04M | Oct 1993 – Oct 1996 |
| Nietsche-Sylvester Unit O-3-21756 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Fayette | 1 | 35.7K | 69.4K | by Jan 1993 – Jan 1999 |
| Lenz Unit O-3-21475 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Brazos | 1 | 33.1K | 270K | by Jan 1993 – Aug 1999 |
| Gruene, O. A. O-4-10871 | Union Pacific Resources Company | Stratton (G-15-5) | Nueces | 1 | 32.7K | 27.9K | by Jan 1993 – Oct 1996 |
| Arco Fee Unit A-15 G-6-163658 | Union Pacific Resources Company | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 31.5K | 1.34M | Mar 1997 – Jul 1999 |
| Zgabay, Edwin "C" O-3-15923 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Burleson | 1 | 30.8K | 251K | by Jan 1993 – Aug 1998 |
| Bush-Bush Unit O-3-21684 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Burleson | 1 | 28.7K | 201K | by Jan 1993 – Mar 2000 |
| Stetz-Rancho Grande Unit O-3-21986 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Brazos | 1 | 28.3K | 187K | Mar 1993 – Nov 1999 |
| Cermorleb-Harbers Unit O-3-21670 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Fayette | 1 | 28K | 205K | by Jan 1993 – Apr 1994 |
| W.R.B. O-11-67383 | Union Pacific Resources Company | Pancho-Mag, SW. (Canyon Reef) | Borden | 1 | 25.8K | 5.64K | Mar 1995 – Dec 1996 |
| Texaco "C" O-6-12999 | Union Pacific Resources Company | Brookeland (Austin Chalk, 8800) | Newton | 2 | 25.2K | 316K | by Jan 1993 – Mar 1995 |
| Zgabay, Delbert O-3-13119 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Burleson | 2 | 25.2K | 263K | by Jan 1993 – Feb 1996 |
| Carroll-Beiring Unit O-3-21156 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Brazos | 1 | 24.5K | 114K | by Jan 1993 – Sep 1996 |
| Salpetro-Penicka Unit O-3-22421 | Union Pacific Resources Company | Giddings (Buda) | Brazos | 1 | 24.4K | 37.8K | May 1994 – Apr 1996 |
| Mills-McGee Trust Unit O-3-23514 | Union Pacific Resources Company | Giddings (Buda) | Milam | 1 | 24.3K | 48.3K | Mar 1998 – Dec 1998 |
| Knox, J. et Al O-3-11828 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Lee | 1 | 24.2K | 280K | by Jan 1993 – Oct 1996 |
| Luedecke-Davros Unit O-3-22451 | Union Pacific Resources Company | Giddings (Buda) | Brazos | 1 | 23.9K | 62.4K | Jan 1994 – Oct 1994 |
| Moss, Edward O-3-21800 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Fayette | 1 | 23.7K | 49.5K | by Jan 1993 – Mar 1999 |
| Bush-Stetz Unit O-3-21694 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Brazos | 1 | 23.7K | 206K | by Jan 1993 – Feb 2000 |
| Risinger-Cooke Unit O-3-21796 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Brazos | 1 | 23.6K | 31.6K | by Jan 1993 – Sep 1994 |
| Callis-Miller Lagrange Unit O-3-21474 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Fayette | 1 | 22.8K | 37.7K | by Jan 1993 – Dec 1996 |
| Rost Unit O-3-20553 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Lee | 1 | 22.8K | 535K | by Jan 1993 – Oct 1999 |
| Schkade-Paseur Unit O-3-21308 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Fayette | 1 | 22.4K | 83.2K | by Jan 1993 – Mar 1997 |
| J. E. Weedon Unit O-3-21257 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Brazos | 1 | 22.1K | 88.8K | by Jan 1993 – Apr 1998 |
| Wendler-Solis Unit O-3-21725 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Fayette | 1 | 21.8K | 45.9K | by Jan 1993 – Mar 1995 |
| Kistner-Hass OL Unit O-3-22320 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Fayette | 1 | 20.6K | 31.7K | Dec 1993 – Aug 1997 |
| Dansby-Dansby Unit O-3-21478 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Brazos | 1 | 20.4K | 127K | by Jan 1993 – Dec 1994 |
| Bvi-Little Unit O-3-21866 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Brazos | 1 | 20.3K | 25.7K | by Jan 1993 – Mar 1997 |
| English O-1-13691 | Union Pacific Resources Company | Pearsall (Austin Chalk) | Frio | 1 | 20.2K | 36.5K | by Jan 1993 – Sep 1996 |
| Arco-Vastar Unit A-914 O-6-13030 | Union Pacific Resources Company | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 19.7K | 163K | by Jan 1993 – Apr 1996 |
| Pittman, Oscar Unit O-3-15021 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Burleson | 1 | 19.3K | 36.2K | by Jan 1993 – May 1996 |
| Selected Lands - House Unit O-3-22510 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Grimes | 1 | 19K | 74.3K | Aug 1994 – Sep 1994 |
| M. Scamardo-Scamardo Unit O-3-21307 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Burleson | 1 | 19K | 194K | by Jan 1993 – Mar 1997 |
| Mueller-Korth Unit O-3-22269 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Lee | 1 | 18.7K | 105K | Nov 1993 – Jan 1994 |
| Coffman-Coffman Unit O-3-21595 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Burleson | 1 | 18.3K | 123K | by Jan 1993 – Mar 1996 |
| College Hills Unit O-3-21673 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Brazos | 1 | 17.5K | 130K | by Jan 1993 – Jul 1995 |
| Scamardo, Morris O-3-22436 | Union Pacific Resources Company | Giddings (Buda) | Burleson | 1 | 17.5K | 26.1K | Mar 1994 – Oct 1994 |
| Waltman-Chance Farms Unit G-3-144378 | Union Pacific Resources Company | Giddings (Austin Chalk, Gas) | Brazos | 1 | 17.3K | 89K | by Jan 1993 – Feb 1997 |
| Wardner, G.P. O-4-11734 | Union Pacific Resources Company | Stratton (Sellers 3, E) | Nueces | 1 | 16.9K | 48.8K | by Jan 1993 – Apr 1996 |
| Tillery Estates O-3-22619 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Robertson | 1 | 16.4K | 2.8K | Nov 1994 – Mar 1997 |
| Lehmann-Schkade Unit O-3-21622 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Fayette | 1 | 16K | 25.2K | by Jan 1993 – Mar 1997 |
| Hawkins O-1-12872 | Union Pacific Resources Company | Pearsall (Austin Chalk) | Frio | 1 | 15.7K | 12.7K | by Jan 1993 – Apr 1997 |
| Carroll-Peters Unit O-3-21302 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Brazos | 1 | 15.6K | 102K | by Jan 1993 – Sep 1996 |
| Novosad, Ben O-3-13292 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Burleson | 2 | 15.5K | 49K | by Jan 1993 – Apr 1996 |
| Buscha-Hempel Unit G-3-140238 | Union Pacific Resources Company | Giddings (Austin Chalk, Gas) | Fayette | 1 | 15.3K | 223K | by Jan 1993 – Aug 1996 |
| Knebel-Cer-Mor-Leb Unit O-3-21558 | Union Pacific Resources Company | Giddings (Austin Chalk-3) | Fayette | 1 | 15.1K | 77.9K | by Jan 1993 – Feb 1994 |
| Arco-Vastar Unit A-256 O-6-12967 | Union Pacific Resources Company | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 14.4K | 243K | by Jan 1993 – Jan 1995 |
| N.W. Oldenburg-Amarado Unit G-3-147603 | Union Pacific Resources Company | Giddings (Austin Chalk, Gas) | Fayette | 1 | 14.2K | 256K | Nov 1993 – Jul 1999 |