Petrora

FORMATIONS · RRC WELLBORE FILE

Sparta

Reported as a top in 2,998 wells across 43 counties, at a median depth of 2,350 ft (590 to 3,579 ft in most wells). 109 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 →

3K
wells reporting a top
109
permitted in last 3 years
43
counties
2,350
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
LA Salle
1,306
1,120557–2,35179
McMullen
613
2,9782,302–3,26811
Brazos
193
2,8402,000–2,8402
DE Witt
124
3,8963,380–4,5320
Nacogdoches
84
12630–2091
Polk
75
6,2805,804–7,0603
Webb
69
2,3001,640–3,7012
Fayette
60
1,135411–1,3402
Zapata
57
2,7501,334–4,6750
Karnes
56
2,9531,930–3,7982
Washington
53
1,112948–1,3110
Gonzales
47
1,1681,054–1,3565
Houston
45
1,300824–1,4620
Austin
28
5,8255,385–5,9882
Trinity
24
1,108687–1,5000
Duval
17
3,3983,072–5,3730
Madison
17
788680–1,0590
Atascosa
13
1,650167–2,8710
Colorado
13
5,3544,602–5,6400
Frio
13
445390–4550
Newton
11
9,7007,720–9,9000
Wilson
9
1,3461,337–1,3630
Dimmit
8
423414–4640
Milam
8
387363–3960
Waller
7
5,8305,640–6,8780
Angelina
6
1,192890–1,5000
Walker
6
2,0801,675–4,1650
Starr
5
2,7002,232–3,8660

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.59537
XTO Energy Inc.18110
BPX Operating Company1118
Marathon Oil EF LLC747
McA Petroleum Corporation248
Patterson Petroleum LP22
Unit Petroleum Company127
Sandalwood Exploration, L.P.111
Strand Energy, L.C.111
Sonerra Resources Corporation15
Arcadia Operating, LLC12
4020 SWD, LLC12
Circle-S Energy, LLC11
Ineos USA Oil & Gas LLC11
Sydri Operating, LLC11
Square Mile Energy, L.L.C.11
Swift Energy Company0432
BHP Billiton Pet(txla OP) Co0151
Chesapeake Operating, L.L.C.0141
Chesapeake Operating, L.L.C.0102
Swift Energy Operating, LLC080
Hawkwood Energy Operating, LLC068
Stonegate Production Company,llc066
Apache Corporation045
Cheyenne Petroleum Company043

Recently permitted wells reporting the Sparta

BY LAST PERMIT ISSUED

Last permitLeaseOperatorCountyTop, ftAPI
Sep 30, 2026WilsonSydri Operating, LLCLA Salle25328334182
Apr 16, 2026Moon PieSonerra Resources CorporationNacogdoches24034733545
Jan 8, 2026Los Olmos RanchCircle-S Energy, LLCWebb1,16847945536
Oct 16, 2025GW Deep Gas Unit 2BPX Operating CompanyMcMullen2,39531136331
Oct 10, 2025Copper D Mipa UnitEOG Resources, Inc.LA Salle1,29128337851
Oct 8, 2025Copper AEOG Resources, Inc.LA Salle1,25828337848
Oct 8, 2025Copper BEOG Resources, Inc.LA Salle1,27728337849
Oct 8, 2025Copper CEOG Resources, Inc.LA Salle1,28528337850
Jun 13, 2025Mary Huff DrennerMcA Petroleum CorporationFayette1,21614933619
May 23, 2025Beaver Creek AEOG Resources, Inc.LA Salle1,00728337812
May 23, 2025Beaver Creek BEOG Resources, Inc.LA Salle1,01728337813
May 23, 2025Beaver Creek CEOG Resources, Inc.LA Salle1,01728337814
May 23, 2025Beaver Creek DEOG Resources, Inc.LA Salle1,02228337815
May 2, 2025Sierra DEOG Resources, Inc.LA Salle84228337810
May 2, 2025Sierra EEOG Resources, Inc.LA Salle84828337811
May 1, 2025Forrest Wheeler 8BPX Operating CompanyMcMullen2,40431136271
May 1, 2025Forrest Wheeler 9BPX Operating CompanyMcMullen2,40431136273
Apr 30, 2025Sierra AEOG Resources, Inc.LA Salle83328337807
Apr 30, 2025Sierra BEOG Resources, Inc.LA Salle83628337808
Apr 30, 2025Sierra CEOG Resources, Inc.LA Salle83628337809
Apr 29, 2025Naylor Jones Unit 69EOG Resources, Inc.LA Salle83628337805
Apr 29, 2025Naylor Jones Unit 69EOG Resources, Inc.LA Salle83528337806
Apr 24, 2025Forrest Wheeler 14BPX Operating CompanyMcMullen2,40431136274
Apr 2, 2025Fridel UnitPatterson Petroleum LPBrazos2,70804131950
Apr 2, 2025LloydPatterson Petroleum LPBrazos2,69504131962

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/sparta, documented in the API reference.