Petrora

FORMATIONS · RRC WELLBORE FILE

San Miguel

Reported as a top in 7,363 wells across 17 counties, at a median depth of 5,009 ft (1,536 to 6,705 ft in most wells). 384 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 →

7.36K
wells reporting a top
384
permitted in last 3 years
17
counties
5,009
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
3,992
5,1522,875–6,022164
Maverick
1,338
1,5281,270–2,80052
Webb
844
6,4364,831–7,677117
Zavala
369
4,3151,766–5,42419
LA Salle
304
6,5185,837–7,8086
Frio
277
5,1374,330–5,80317
McMullen
182
9,1928,051–9,6490
Atascosa
18
5,2201,546–8,5251
Medina
15
1,0721,061–1,0760
Bexar
6
1,027999–1,0440
Live Oak
6
10,28710,264–10,5746
DE Witt
5
11,16411,137–11,7212

Operators

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

OperatorLast 3 yrsAll
SM Energy Company87251
Grit Oil & Gas Management, LLC71293
Rosewood Resources, Inc.3564
Murphy Expl. & Prod. Co. - USA27220
EL Toro Resources LLC2776
Silverbow Resources Oper, LLC2455
Formentera Operations LLC1616
Strand Energy, L.C.1323
Endeavor Natural Gas, LP10110
Exco Operating Company, LP835
Atlas Operating LLC819
Trinity Operating (Usg), LLC6113
Ineos USA Oil & Gas LLC69
Hamilton, Clay58
TBM Catarina, LLC55
Escondido Resources Oper Co, LLC55
Blackbrush O & G, LLC452
Cytex South Texas Operating LLC44
Rosetta Resources Operating LP312
Javelin Energy Partners Mgmt LLC33
Three C Exploration, LLC33
CML Exploration, LLC218
Verdun Oil & Gas LLC25
Gulftex Energy, LLC23
Magnolia Oil & Gas Operating LLC22

Recently permitted wells reporting the San Miguel

BY LAST PERMIT ISSUED

Last permitLeaseOperatorCountyTop, ftAPI
Jun 12, 2026Chittim HeirsBlackbrush O & G, LLCZavala2,23650733572
May 21, 2026Chittim Heirs BBlackbrush O & G, LLCMaverick1,88632333694
May 21, 2026Chittim Heirs ABlackbrush O & G, LLCMaverick1,87032333695
May 4, 2026UrbanGulftex Energy, LLCZavala3,29350733571
Apr 30, 2026BlackmonGulftex Energy, LLCZavala3,29150733570
Apr 20, 2026Glass RanchJonah Energy LLCMaverick2,66632333684
Apr 13, 2026Gambler-STX-UnitFormentera Operations LLCFrio4,91716334409
Apr 13, 2026Lucille-STX-Unit-BFormentera Operations LLCFrio4,95216334412
Apr 13, 2026Lucille-STX-Unit-BFormentera Operations LLCFrio4,97916334413
Feb 18, 2026Briscoe Ranch (SA3)SM Energy CompanyWebb4,51447945576
Feb 17, 2026San Ambrosia D (SA17)SM Energy CompanyWebb4,55947945574
Feb 17, 2026San Ambrosia D (SA18)SM Energy CompanyWebb4,53847945575
Feb 9, 2026Matrix Caspian DEscondido Resources Oper Co, LLCWebb9,29147945571
Feb 6, 2026Donut Palace-STX-UnitFormentera Operations LLCFrio5,04116334395
Feb 6, 2026Donut Palace-STX-UnitFormentera Operations LLCFrio5,02216334396
Feb 6, 2026Hooey-STX-Unit-BFormentera Operations LLCFrio5,26816334398
Jan 30, 2026Cage AEndeavor Natural Gas, LPMaverick3,00032333681
Jan 30, 2026Cage AEndeavor Natural Gas, LPMaverick3,00032333682
Jan 22, 2026Faith-Rincon 'F' UnitStrand Energy, L.C.Webb3,29047945540
Jan 22, 2026Faith-Rincon 'F' UnitStrand Energy, L.C.Webb3,27447945541
Jan 22, 2026Faith-Rincon 'F' UnitStrand Energy, L.C.Webb3,34547945542
Jan 22, 2026Faith-Rincon 'F' UnitStrand Energy, L.C.Webb3,28047945543
Jan 20, 2026San Ambrosia a (SA3)SM Energy CompanyWebb3,65647945548
Jan 20, 2026San Ambrosia a (SA2)SM Energy CompanyWebb3,65047945549
Jan 20, 2026San Ambrosia a (SA1)SM Energy CompanyWebb3,68247945550

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/san-miguel, documented in the API reference.