Petrora

FORMATIONS · RRC WELLBORE FILE

Olmos

Reported as a top in 21,693 wells across 25 counties, at a median depth of 5,304 ft (1,378 to 8,810 ft in most wells). 1,408 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 →

21.7K
wells reporting a top
1,408
permitted in last 3 years
25
counties
5,304
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
Dimmit
4,413
4,1422,205–5,047233
Webb
4,088
5,7503,903–7,606400
LA Salle
3,530
6,7955,508–8,131212
McMullen
2,726
8,9167,499–10,538220
Atascosa
1,924
5,6621,451–8,75495
Bexar
1,301
1,288834–1,5010
Frio
1,009
4,4783,125–6,02165
Medina
807
902788–1,01412
Zavala
649
3,8421,827–4,47431
Maverick
466
1,050521–2,12050
Karnes
333
9,4608,037–10,34715
Wilson
256
6,6705,970–7,48250
Live Oak
63
9,7609,297–12,0198
Gonzales
51
7,9195,840–9,4901
Bee
30
10,81610,158–12,64011
DE Witt
15
11,48110,408–11,8635
Lavaca
9
9,1638,684–11,8960
Milam
7
406400–4080
Fayette
6
7,1106,608–8,5440

Operators

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

OperatorLast 3 yrsAll
EOG Resources, Inc.2611,520
SM Energy Company98534
Javelin Energy Partners Mgmt LLC90140
Kimmeridge Texas Gas, LLC84117
BPX Operating Company75177
Silverbow Resources Oper, LLC72253
Grit Oil & Gas Management, LLC71293
Rosewood Resources, Inc.70148
Lewis Petro Properties, Inc.551,227
Gulftex Energy, LLC3450
Murphy Expl. & Prod. Co. - USA33900
Warwick-Artemis, LLC3140
XTO Energy Inc.27194
EL Toro Resources LLC2774
Verdun Oil & Gas LLC2554
Formentera Operations LLC2525
Verdun Oil EF II LLC2224
Texas American Resources Company17136
Trinity Operating (Usg), LLC16219
Ageron Energy, LLC1638
Ineos USA Oil & Gas LLC1524
Strand Energy, L.C.1424
Kimmeridge Texas Gas, LLC1414
Petrohawk Operating Company12185
Burlington Resources O & G Co LP1249

Recently permitted wells reporting the Olmos

BY LAST PERMIT ISSUED

Last permitLeaseOperatorCountyTop, ftAPI
Jul 10, 2026TlapekCML Exploration, LLCZavala3,27950732726
Jul 8, 2026Sopwith Camel CVerdun Oil EF II LLCLA Salle8,52328337936
Jul 8, 2026Sopwith Camel DVerdun Oil EF II LLCLA Salle8,69328337937
Jun 18, 2026Tommy AVerdun Oil & Gas LLCLA Salle8,52628337930
Jun 18, 2026Tommy BVerdun Oil & Gas LLCLA Salle8,49928337931
Jun 16, 2026BanrichRosewood Resources, Inc.Frio3,76516334421
Jun 16, 2026BanrichRosewood Resources, Inc.Frio3,83816334423
May 4, 2026UrbanGulftex Energy, LLCZavala2,46650733571
Apr 30, 2026BlackmonGulftex Energy, LLCZavala2,46350733570
Apr 29, 2026Pge BrowneSilverbow Resources Oper, LLCWebb4,46647945310
Apr 24, 2026Pge BrowneSilverbow Resources Oper, LLCWebb4,48847945313
Apr 20, 2026Glass RanchJonah Energy LLCMaverick1,64632333684
Apr 13, 2026Gambler-STX-UnitFormentera Operations LLCFrio4,44416334410
Apr 13, 2026Lucille-STX-Unit-AFormentera Operations LLCFrio4,46916334411
Apr 13, 2026Lucille-STX-Unit-BFormentera Operations LLCFrio4,41016334412
Apr 13, 2026Lucille-STX-Unit-BFormentera Operations LLCFrio4,47716334413
Mar 30, 2026Wilson C Alloc.Sydri Operating, LLCLA Salle6,05328334187
Mar 16, 2026Lang TrustRosewood Resources, Inc.Zavala4,57850733569
Mar 13, 2026Lang TrustRosewood Resources, Inc.Zavala4,57850733566
Mar 13, 2026Lang TrustRosewood Resources, Inc.Zavala4,57750733567
Mar 13, 2026Lang TrustRosewood Resources, Inc.Zavala4,58850733568
Mar 6, 2026Shelton UnitTexas American Resources CompanyFrio4,29816334404
Mar 6, 2026Shelton UnitTexas American Resources CompanyFrio4,29616334405
Mar 6, 2026Robert GutierrezLewis Petro Properties, Inc.LA Salle7,48028337887
Mar 5, 2026DixondaleCML Exploration, LLCDimmit3,74212738846

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/olmos, documented in the API reference.