OPERATORS · TEXAS · P-5 NUMBER 525398 · KARNES COUNTY
Marathon Oil EF LLC in Karnes 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 1,876 drilling permits on file in Karnes County, the first issued in 2010 and the latest on October 30, 2026.
35 of them came in the last twelve months, 94% more than the year before; 100% horizontal, averaging 17,327 ft.
It is operator of record on 1,766 wells in the county: 1,475 producing, 131 shut in, 1 injection.
Its completed wells here most often report Austin Chalk, Eagle Ford, Carrizo.
- 35
- permits, 12 months +94%
- 1,876
- permits, all time since 2010
- 100%
- horizontal, 12 months
- 17,327
- ft average depth, 12 months
- 1,766
- wells of record
- 1,475
- producing · 131 shut in · 1 injection
Permits issued by month
LAST FIVE YEARS · KARNES ONLY
Last 12 months 35 · prior 12 16(+119%)
Latest permits here
| Issued | Lease / well | Type | Depth |
|---|---|---|---|
| Oct 30, 2026 | Rodriguez-Medina SA A #1 919591 | DrillHZ | 17,500 |
| Oct 27, 2026 | Rodriguez-Medina SA C #1 919593 | DrillHZ | 17,500 |
| Oct 27, 2026 | Rodriguez-Medina SA B #1 919592 | DrillHZ | 17,500 |
| Oct 8, 2026 | Sprencel-Peck Unit #3H 919107 | RecompletionHZ | 11,428 |
| Oct 1, 2026 | Haus-Jau-Chris SA B #1 918433 | DrillHZ | 17,500 |
| Oct 1, 2026 | Haus Quad SA A #1 918432 | DrillHZ | 17,500 |
| Sep 10, 2026 | Haus-Chris SA D #1 918436 | DrillHZ | 17,500 |
| Sep 10, 2026 | Haus-Chris SA C #1 918434 | DrillHZ | 17,500 |
| Jun 18, 2026 | Dull-Hand-Cho SA A #1 916455 | DrillHZ | 17,500 |
| Jun 18, 2026 | Choate 01 #15H 916454 | DrillHZ | 17,500 |
All 1,876 permits in Karnes County, searchable → · Wells of record here →
Permit types and formations
Permit types
- Drill
- 34 / 1,847
- Recompletion
- 1 / 15
- Field transfer
- 0 / 12
- Reclass
- 0 / 2
12 MONTHS / ALL TIME
Formations reported
- Austin Chalk
- 1,706
- Eagle Ford
- 1,701
- Carrizo
- 1,338
- Wilcox
- 1,334
- Yegua
- 1,291
- Queen City
- 1,290
- Reklaw
- 1,288
- Frio
- 1,287
- Edwards
- 1,278
- Sligo
- 1,253
Leases it reports here
| Lease | Wells | Oil, bbl | Last reported |
|---|---|---|---|
| Boris Unit | 16 | 4.03M | Jul 2026 |
| Challenger Unit C | 10 | 3.86M | Jul 2026 |
| Wingnut Unit 'A' | 8 | 3.19M | Jul 2026 |
| Wingnut Unit 'B' | 10 | 3.13M | Jul 2026 |
| Mohr-Hons Unit | 8 | 3.1M | Jul 2026 |
| Jauer-Sonka Unit | 9 | 3.01M | Jul 2026 |
| Challenger Unit A | 11 | 2.93M | Jul 2026 |
| Ridley 01 | 11 | 2.87M | Jul 2026 |
| Karnes City SW Unit | 9 | 2.69M | Jul 2026 |
| Karnes City SE Unit | 6 | 2.65M | Jul 2026 |
| Challenger Unit B | 9 | 2.6M | Jul 2026 |
| Karnes City NE Unit | 6 | 2.6M | Jul 2026 |
| May Unit 1 | 8 | 2.56M | Jul 2026 |
| Julie Beck | 16 | 2.55M | Jul 2026 |
| Carter-Holm Unit | 9 | 2.33M | Jul 2026 |
All leases it reports → · Other operators in Karnes 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/karnes, documented in the API reference.