Petrora

FORMATIONS · RRC WELLBORE FILE

Tansill

Reported as a top in 4,108 wells across 26 counties, at a median depth of 2,300 ft (1,961 to 2,887 ft in most wells). 101 of those wells were permitted in the last three years.

A well counts if any of its completion filings report this formation, whether it produces from it or drilled through it. Depths are measured depth as filed; typo depths exist, which is why ranges are percentiles, not extremes. About completion reports →

4.11K
wells reporting a top
101
permitted in last 3 years
26
counties
2,300
median top, ft

COMPUTED OCT 29, 2026 · REBUILT DAILY

Depth by county

Counties with at least five wells reporting the top. Bars are well counts.

CountyWellsMedian, ftP10–P90Last 3 yrs
Ward
1,532
2,3002,300–2,3001
Winkler
673
2,3002,280–2,38710
Ector
452
2,6992,452–2,85610
Andrews
340
2,8542,647–2,9350
Gaines
280
2,9702,734–3,09741
Scurry
148
788701–8880
Crane
133
1,4021,261–2,02215
Pecos
99
2,390731–2,6700
Yoakum
89
2,9482,800–3,2100
Hockley
73
2,6692,530–2,7810
Midland
57
2,6202,433–2,8444
Martin
50
2,2501,888–2,92313
Terry
37
3,0822,672–3,1210
Dawson
30
2,7952,458–2,8883
Upton
19
2,3601,444–2,9281
Howard
17
1,4391,108–1,6700
Glasscock
16
1,9561,800–2,0361
Cochran
15
2,8172,799–2,9570
Reagan
15
1,6021,379–1,8350
Borden
14
1,6991,630–1,7630
Garza
7
1,2021,040–2,4202

Operators

Current operator of record for wells reporting the top, ranked by wells permitted in the last three years.

OperatorLast 3 yrsAll
OXY USA WTP LP3181
XTO Energy Inc.1672
Blackbeard Operating, LLC9124
OXY USA WTP LP942
OXY Low Carbon Ventures, LLC88
Formentera Operations LLC33
Slant Operating, LLC211
Devon Energy Production Co, L.P.27
Pennzoil Exploration & Prod. Co.25
Basin Oil & Gas Operating, LLC22
Stonehill Dawson, LLC22
Gulf Oil Corp.1236
Chevron U. S. A. Inc.1110
Occidental Permian Ltd.189
Burlington Res O & G Co-Midland19
Stonehill Martin, LLC15
Smith Energy Operating Company12
Overflow Energy Permian, LLC12
Walsh & Watts, Inc.12
Pennzenergy Exp. & Prod., L.L.C.12
Yates Energy Corporation11
Scout Energy Management LLC11
Ring Energy, Inc.11
Stonehill Culberson, LLC11
Stout Energy Inc.11

Recently permitted wells reporting the Tansill

BY LAST PERMIT ISSUED

Last permitLeaseOperatorCountyTop, ftAPI
Oct 21, 2026West Seminole SA UnitOXY USA WTP LPGaines3,07816538557
Oct 21, 2026West Seminole SA UnitOXY USA WTP LPGaines3,05616538559
Oct 13, 2026Seminole San Andres UnitOXY USA Inc.Gaines3,08916501824
Oct 5, 2026Seminole San Andres UnitOXY USA Inc.Gaines2,97216500037
Sep 25, 2026West Seminole SA UnitOXY USA WTP LPGaines2,98416538405
Aug 21, 2026Seminole San Andres UnitOXY USA Inc.Gaines3,03816500102
Aug 12, 2026Seminole San Andres UnitOXY USA Inc.Gaines3,02416501213
Jul 2, 2026State-WaltonPennzenergy Exp. & Prod., L.L.C.Winkler2,20449505173
Jun 12, 2026Seminole San Andres UnitOXY USA Inc.Gaines2,97016532873
Jun 5, 2026Seminole San Andres UnitOXY USA Inc.Gaines3,02816532009
May 29, 2026Seminole San Andres UnitOXY USA Inc.Gaines2,96016532021
May 14, 2026Seminole San Andres UnitOXY USA Inc.Gaines3,14016501580
Apr 22, 2026Seminole San Andres UnitOXY USA Inc.Gaines3,02116531373
Apr 21, 2026SsauOXY USA Inc.Gaines3,01516531158
Apr 10, 2026Seminole San Andres UnitOXY USA Inc.Gaines3,01316531254
Nov 7, 2025Saguaro SWD 2Stonehill Martin, LLCMartin2,37831747082
Oct 21, 2025Ranger 24Yates Energy CorporationGarza1,20216934328
Oct 9, 2025Sisak 16 SWD 2Stonehill Dawson, LLCDawson2,47111534093
Sep 16, 2025Seminole San Andres UnitOXY USA Inc.Gaines3,04216501864
Sep 16, 2025Seminole San Andres UnitOXY USA Inc.Gaines3,04116531364
Sep 4, 2025SsauOXY USA Inc.Gaines3,03916531176
Aug 29, 2025West Seminole SA UnitOXY USA WTP LPGaines2,95816532301
Jul 30, 2025Waddell TR 3Blackbeard Operating, LLCCrane2,00110301598
Jun 30, 2025Seminole San Andres UnitOXY USA Inc.Gaines3,07816538991
Jun 18, 2025Seminole San Andres UnitOXY USA Inc.Gaines3,10716539005

About this data

Formation tops, elevations, perforations, and casing from the RRC dbf900 wellbore file, refreshed weekly, with reported names normalized to Petrora's formation registry. County and operator breakdowns are rebuilt nightly.

Developers: this page as JSON is GET /v1/data/formations/tansill, documented in the API reference.