Petrora

FORMATIONS · RRC WELLBORE FILE

Carrizo

Reported as a top in 10,176 wells across 42 counties, at a median depth of 3,807 ft (1,390 to 5,326 ft in most wells). 640 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 →

10.2K
wells reporting a top
640
permitted in last 3 years
42
counties
3,807
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
Karnes
4,008
4,4453,450–5,730317
Gonzales
1,294
3,2571,942–4,613104
McMullen
1,134
4,6153,230–5,08729
Atascosa
1,127
2,9901,580–4,029105
Anderson
651
534404–5804
LA Salle
603
2,6342,000–3,54839
Webb
375
3,3601,598–6,27318
Zapata
187
4,8653,670–5,8821
Wilson
174
724300–2,10213
Houston
139
1,5451,512–1,9160
Live Oak
119
5,0964,350–5,7092
Frio
86
1,540608–2,2752
DE Witt
39
6,0652,581–6,4836
Dimmit
39
948300–1,4700
Trinity
38
1,8301,792–2,2790
Zavala
26
71550–1,3560
Lee
23
1,2601,078–2,4480
Bastrop
18
990737–1,1560
Bee
16
5,7805,614–5,9280
Madison
13
1,6341,540–1,7300
Duval
11
8,9707,715–9,5400
Fayette
11
1,9901,195–2,8120
Angelina
9
1,9431,593–2,1300
Bexar
9
5501–5500
Nacogdoches
5
456233–4980

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.2422,192
Marathon Oil EF LLC1351,547
Burlington Resources O & G Co LP132472
Devon Energy Production Co, L.P.62140
Murphy Expl. & Prod. Co. - USA16281
Tidal Petroleum, Inc.1038
XTO Energy Inc.981
BPX Operating Company681
Pillar Efs, LLC422
Auterra Operating, LLC48
Silverbow Resources Oper, LLC246
Verdun Oil & Gas LLC210
LP Operating, LLC22
Mueller Exploration, Inc.22
Rock Bottom Oil, GP, L.L.C.22
Trueblood Resources, Inc.127
Modern Exploration, Inc.112
Wagner Oil Company16
Millennium Exploration Co. LLC14
Rickaway Energy, Corp.14
US Ecology Karnes Cnty Disp, LLC11
Sage Geosystems Inc.11
PCR Energy la LLC11
BB-Southtex, LLC11
Linder, John Operating Co., LLC11

Recently permitted wells reporting the Carrizo

BY LAST PERMIT ISSUED

Last permitLeaseOperatorCountyTop, ftAPI
Feb 10, 2026Perlino AEOG Resources, Inc.Atascosa1,89901336263
Oct 10, 2025J Wiatrek Unit BBurlington Resources O & G Co LPKarnes4,30525538316
Oct 10, 2025Copper D Mipa UnitEOG Resources, Inc.LA Salle2,95728337851
Oct 9, 2025J Wiatrek Unit ABurlington Resources O & G Co LPKarnes4,30625538312
Oct 9, 2025J Wiatrek Unit BBurlington Resources O & G Co LPKarnes4,30825538313
Oct 9, 2025J Wiatrek Unit BBurlington Resources O & G Co LPKarnes4,30725538314
Oct 9, 2025J Wiatrek Unit BBurlington Resources O & G Co LPKarnes4,29525538315
Oct 9, 2025J Wiatrek a-B Ulw ABurlington Resources O & G Co LPKarnes4,16725538317
Oct 8, 2025Copper AEOG Resources, Inc.LA Salle2,92428337848
Oct 8, 2025Copper BEOG Resources, Inc.LA Salle2,94328337849
Oct 1, 2025J Wiatrek Unit ABurlington Resources O & G Co LPKarnes4,29525538311
Sep 19, 2025Hubert-JohnsonMueller Exploration, Inc.Live Oak5,09029736537
Sep 5, 2025Franklin South ATidal Petroleum, Inc.McMullen3,89431137626
Sep 5, 2025Franklin South BTidal Petroleum, Inc.McMullen3,89431137627
Sep 5, 2025Franklin South CTidal Petroleum, Inc.McMullen3,89431137628
Sep 5, 2025Franklin South DTidal Petroleum, Inc.McMullen3,89431137629
Sep 4, 2025Palisades DEOG Resources, Inc.McMullen4,29531137636
Sep 4, 2025Palisades FEOG Resources, Inc.McMullen4,30731137638
Sep 3, 2025Palisades BEOG Resources, Inc.McMullen4,29131137634
Aug 29, 2025Husky-GKT AMueller Exploration, Inc.Live Oak5,13229736536
Aug 29, 2025Palisades AEOG Resources, Inc.McMullen4,28331137633
Aug 18, 2025Henry, Wm. O.Rickaway Energy, Corp.Atascosa1,50001334064
Aug 8, 2025Spear Reynolds Unit EBurlington Resources O & G Co LPKarnes5,36025533697
Aug 7, 2025Escondido a B Usw CBurlington Resources O & G Co LPKarnes5,12925536105
Jul 31, 2025Ruck-Col-Brown Ulw ABurlington Resources O & G Co LPKarnes4,84325538297

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/carrizo, documented in the API reference.