OPERATORS · TEXAS · P-5 NUMBER 525398 · ATASCOSA COUNTY
Marathon Oil EF LLC in Atascosa County
One operator, one county: its permits, wells of record, formations, and leases here, with the rest of the county and the rest of the operator one click away.
Marathon Oil Ef LLC has 516 drilling permits on file in Atascosa County, the first issued in 2011 and the latest on May 6, 2026.
4 of them came in the last twelve months, 73% fewer than the year before; 100% horizontal, averaging 17,500 ft.
It is operator of record on 499 wells in the county: 426 producing, 68 shut in, 0 injection.
Its completed wells here most often report Austin Chalk, Anacacho, Olmos.
- 4
- permits, 12 months -73%
- 516
- permits, all time since 2011
- 100%
- horizontal, 12 months
- 17,500
- ft average depth, 12 months
- 499
- wells of record
- 426
- producing · 68 shut in · 0 injection
Permits issued by month
LAST FIVE YEARS · ATASCOSA ONLY
Last 12 months 4 · prior 12 13(-69%)
Latest permits here
| Issued | Lease / well | Type | Depth |
|---|---|---|---|
| May 6, 2026 | Foushee-Wright Keathley SA6 #6H 915293 | DrillHZ | 17,500 |
| May 6, 2026 | Foushee-Wright Keathley SA5 #5H 915292 | DrillHZ | 17,500 |
| May 6, 2026 | Foushee-Wright Keathley SA6 #6H 915293 | DrillHZ | 17,500 |
| May 6, 2026 | Foushee-Wright Keathley SA5 #5H 915292 | DrillHZ | 17,500 |
| May 4, 2026 | Mauch-Wright Henke SA2 #2H 915291 | DrillHZ | 17,500 |
| May 4, 2026 | Mauch-Wright Henke SA1 #1H 915290 | DrillHZ | 17,500 |
| May 4, 2026 | Mauch-Wright Henke SA2 #2H 915291 | DrillHZ | 17,500 |
| May 4, 2026 | Mauch-Wright Henke SA1 #1H 915290 | DrillHZ | 17,500 |
| Sep 30, 2025 | Mauch-Wright-Ethridge SA2 #2H 910512 | DrillHZ | 17,500 |
| Sep 23, 2025 | Wright-Ethridge SA3 #3H 910522 | DrillHZ | 17,500 |
All 516 permits in Atascosa County, searchable → · Wells of record here →
Permit types and formations
Permit types
- Drill
- 4 / 509
- Recompletion
- 0 / 6
- Field transfer
- 0 / 1
12 MONTHS / ALL TIME
Formations reported
- Austin Chalk
- 489
- Anacacho
- 489
- Olmos
- 392
- Wilcox
- 386
- Navarro
- 371
- Queen City
- 371
- Carrizo
- 370
- Bartosh
- 368
- Escondido
- 368
- Reklaw
- 368
Leases it reports here
| Lease | Wells | Oil, bbl | Last reported |
|---|---|---|---|
| Middle McCowen | 125 | 30.4M | Apr 2026 |
| Guajillo East | 61 | 10.9M | Apr 2026 |
| R. May B | 28 | 5.76M | Apr 2026 |
| R. May A | 14 | 2.4M | Apr 2026 |
| May-Chapman | 9 | 2.11M | Apr 2026 |
| Guajillo West | 9 | 2.03M | Apr 2026 |
| 74 Ranch Unit S3 | 6 | 1.81M | Apr 2026 |
| 74 Ranch Unit S2 | 5 | 1.55M | Apr 2026 |
| Guajillo Unit 8 South | 5 | 1.5M | Apr 2026 |
| 74 Ranch Special Unit East | 5 | 1.48M | Apr 2026 |
| Tom-Smith Unit A | 6 | 1.43M | Apr 2026 |
| Wilhelm Smith Unit B | 6 | 1.38M | Apr 2026 |
| Guajillo Unit 7 South | 5 | 1.29M | Apr 2026 |
| 74 Ranch Unit S1 | 5 | 1.29M | Apr 2026 |
| Heard Bower West Unit | 9 | 1.26M | Apr 2026 |
All leases it reports → · Other operators in Atascosa County →
About this data
Permits from the RRC OGA049M master and daily daf420 files; wells of record and status from the EWA wellbore schedule, weekly; formations from the dbf900 wellbore file; leases from PDQ lease reports, placed in the county by the wells completed on them.
Developers: this page as JSON is GET /v1/data/operators/tx/525398/counties/atascosa, documented in the API reference.