Petrora

FORMATIONS · RRC WELLBORE FILE

Anacacho

Reported as a top in 15,299 wells across 30 counties, at a median depth of 8,769 ft (4,937 to 11,266 ft in most wells). 944 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 →

15.3K
wells reporting a top
944
permitted in last 3 years
30
counties
8,769
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
McMullen
2,146
9,9938,866–11,480261
Gonzales
1,903
9,7877,903–10,912106
Karnes
1,848
10,5269,264–12,26034
LA Salle
1,566
8,3226,788–9,83974
Dimmit
1,436
6,1105,043–6,79015
Atascosa
1,423
9,1787,046–10,628120
Frio
956
5,9604,884–7,19159
Webb
936
7,4346,172–8,508111
Zavala
583
5,2934,250–5,87423
Bexar
573
1,2001,038–1,4490
DE Witt
568
12,18211,265–13,00714
Wilson
458
7,2894,529–8,45946
Lavaca
258
10,8389,754–11,69958
Medina
244
1,281910–1,44612
Live Oak
163
11,41210,976–12,5347
Maverick
120
2,691669–3,4054
Fayette
37
9,0327,636–9,9670
Polk
24
12,62612,014–13,2140
Guadalupe
14
2,8301,650–3,8810
Bee
10
12,68612,312–12,8440
Caldwell
6
1,6711,418–1,7400
Lee
6
8,2007,838–8,9420
Washington
6
9,0688,564–9,9780

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.2633,350
Rocc Operating, LLC8185
SM Energy Company63443
Silverbow Resources Oper, LLC50121
BPX Operating Company47186
Marathon Oil EF LLC421,084
Petrohawk Operating Company36464
Gulftex Energy, LLC3583
Kimmeridge Texas Gas, LLC2635
Warwick-Artemis, LLC2332
Ridgemar Energy Operating, LLC2123
Formentera Operations LLC2121
Javelin Energy Partners Mgmt LLC2058
Rosewood Resources, Inc.1750
Trinity Operating (Usg), LLC14178
Verdun Oil & Gas LLC1431
Ineos USA Oil & Gas LLC1326
Burlington Resources O & G Co LP1234
Rocc Oil & Gas, L.P.1028
XTO Energy Inc.9111
CML Exploration, LLC980
Exco Operating Company, LP8202
Texas American Resources Company899
Trailblazer Energy Resources,llc88
Premier Minerals, Inc.744

Recently permitted wells reporting the Anacacho

BY LAST PERMIT ISSUED

Last permitLeaseOperatorCountyTop, ftAPI
Sep 21, 2026B.K. AeryTalisman Energy USA Inc.McMullen10,56631135203
Sep 1, 2026Barnhart (EF)Marathon Oil EF LLCGonzales8,76017732494
Jul 10, 2026TlapekCML Exploration, LLCZavala4,72650732726
Jun 12, 2026Chittim HeirsBlackbrush O & G, LLCZavala3,21650733572
May 21, 2026Chittim Heirs BBlackbrush O & G, LLCMaverick2,87732333694
May 21, 2026Chittim Heirs ABlackbrush O & G, LLCMaverick2,83932333695
May 4, 2026UrbanGulftex Energy, LLCZavala4,20050733571
Apr 30, 2026Wessendorff 6-Wessendorff 1 (SA)Statoil Texas Onshore Prop LLCKarnes12,97125533324
Apr 30, 2026BlackmonGulftex Energy, LLCZavala4,19050733570
Apr 28, 2026Wessendorff 6-Wessendorff 1Statoil Texas Onshore Prop LLCKarnes12,95925533305
Apr 28, 2026Wessendorff 6-Wessendorff 1 (SA)Statoil Texas Onshore Prop LLCKarnes13,05725533323
Apr 24, 2026Pge BrowneSilverbow Resources Oper, LLCWebb6,47647945313
Apr 13, 2026Gambler-STX-UnitFormentera Operations LLCFrio5,56616334410
Apr 13, 2026Lucille-STX-Unit-AFormentera Operations LLCFrio5,62216334411
Apr 13, 2026Lucille-STX-Unit-BFormentera Operations LLCFrio5,60416334413
Mar 30, 2026Wilson C Alloc.Sydri Operating, LLCLA Salle7,32928334187
Mar 6, 2026Shelton UnitTexas American Resources CompanyFrio5,35016334404
Mar 6, 2026Shelton UnitTexas American Resources CompanyFrio5,34316334405
Mar 5, 2026DixondaleCML Exploration, LLCDimmit5,31412738846
Mar 5, 2026KleimannCML Exploration, LLCZavala4,77750733364
Mar 5, 2026Sugar RanchCML Exploration, LLCZavala5,72750733536
Feb 18, 2026Briscoe Ranch (SA3)SM Energy CompanyWebb5,66247945576
Feb 10, 2026Perlino AEOG Resources, Inc.Atascosa7,67501336263
Feb 9, 2026Matrix Caspian DEscondido Resources Oper Co, LLCWebb10,42047945571
Feb 6, 2026Donut Palace-STX-UnitFormentera Operations LLCFrio5,62716334395

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/anacacho, documented in the API reference.