Texas Mineral Radar → operators → MARATHON OIL EF LLC
MARATHON OIL EF LLC
MARATHON OIL EF LLC is registered with the Railroad Commission of Texas as operator #525398. It holds 1,946 wellbores on record, 1,564 of them producing. It has 153 drilling permits on record across 6 Texas counties (Karnes, Atascosa, Gonzales and 3 more), most recently on 2026-10-02. 153 of those permits are horizontal wells — the kind that can drain minerals a mile or more from the surface location.
The mineral owners under MARATHON OIL EF LLC's new permits
For mineral buyers and landmen: when MARATHON OIL EF LLC files a new W-1 drilling permit, the Permit Owner File matches it to the listed mineral owners under the tract and delivers them that Monday with mailing addresses, for every operator filing in the package counties.
Recent permits by MARATHON OIL EF LLC
| Filed | County | Lease | Type | Flags |
|---|---|---|---|---|
| 2026-10-02 | Karnes | SPRENCEL-PECK UNIT | Recompletion | Horiz |
| 2026-09-16 | Karnes | WESTON-WEST-PMT SA A | Drill | Horiz |
| 2026-09-04 | Karnes | HAUS-JAU-CHRIS SA B | Drill | Horiz |
| 2026-09-04 | Karnes | HAUS QUAD SA A | Drill | Horiz |
| 2026-09-04 | Karnes | HAUS-CHRIS SA D | Drill | Horiz |
| 2026-09-04 | Karnes | HAUS-CHRIS SA C | Drill | Horiz |
| 2026-09-03 | Live Oak | WHITSETT-TAYLOR-MASS SA D | Drill | Horiz |
| 2026-09-03 | Live Oak | WHITSETT-TAYLOR-MASS SA C | Drill | Horiz |
| 2026-09-03 | Live Oak | WHITSETT-TAYLOR-MASS SA B | Drill | Horiz |
| 2026-09-03 | Live Oak | WHITSETT-TAYLOR-MASS SA A | Drill | Horiz |
| 2026-08-03 | Gonzales | BARNHART (EF) | Drill | Horiz |
| 2026-07-17 | Atascosa | MAUCH-WRIGHT HENKE SA1 | Drill | Horiz |
| 2026-07-15 | Gonzales | BARNHART (EF)-HFS SA9 | Drill | Horiz |
| 2026-07-15 | Gonzales | BARNHART (EF)-HFS SA10 | Drill | Horiz |
| 2026-07-14 | Gonzales | BARNHART (EF) | Drill | Horiz |
| 2026-07-14 | Gonzales | BARNHART (EF) | Drill | Horiz |
| 2026-07-14 | Gonzales | BARNHART (EF) | Drill | Horiz |
| 2026-07-09 | Dewitt | HOPE-SAUNDERS B SA D | Drill | Horiz |
| 2026-07-09 | Dewitt | HOPE-DWOR-SAUN B SA A | Drill | Horiz |
| 2026-07-08 | Atascosa | MAUCH-WRIGHT HENKE SA2 | Drill | Horiz |
| 2026-07-07 | Atascosa | FOUSHEE-WRIGHT KEATHLEY SA6 | Drill | Horiz |
| 2026-07-07 | Atascosa | FOUSHEE-WRIGHT KEATHLEY SA5 | Drill | Horiz |
| 2026-06-18 | Gonzales | BARNHART (EF)-JM PRES SA | Drill | Horiz |
| 2026-06-18 | Gonzales | BARNHART (EF) K-JM PRES SA | Drill | Horiz |
| 2026-06-15 | Karnes | DULL-HAND-CHO SA A | Drill | Horiz |
| 2026-06-15 | Karnes | CHOATE 01 | Drill | Horiz |
| 2026-05-28 | Karnes | WESTON-WEST-PMT SA B | Drill | Horiz |
| 2026-05-28 | Karnes | WESTON-WEST-PMT SA A | Drill | Horiz |
| 2026-05-28 | Karnes | WESTON-PMT SA E | Drill | Horiz |
| 2026-05-28 | Karnes | WESTON-PMT SA D | Drill | Horiz |
Where MARATHON OIL EF LLC operates
| County | Permits | Most recent |
|---|---|---|
| Karnes County | 65 | 2026-10-02 |
| Atascosa County | 38 | 2026-07-17 |
| Gonzales County | 31 | 2026-08-03 |
| Dewitt County | 12 | 2026-07-09 |
| Live Oak County | 5 | 2026-09-03 |
| Lavaca County | 2 | 2019-12-20 |
Fields MARATHON OIL EF LLC holds wells in
| Field | Wells | Producing |
|---|---|---|
| EAGLEVILLE (EAGLE FORD-2) | 864 | 714 |
| EAGLEVILLE (EAGLE FORD-1) | 471 | 396 |
| SUGARKANE (EAGLE FORD) | 433 | 342 |
| SUGARKANE (AUSTIN CHALK) | 157 | 108 |
| EAGLEVILLE (EAGLE FORD) | 7 | 0 |
| FIRST SHOT (AUSTIN CHALK) | 4 | 0 |
| DE WITT (EAGLE FORD SHALE) | 4 | 3 |
| PILGRIM (AUSTIN CHALK) | 1 | 0 |
| INDIO TANKS (PEARSALL) | 1 | 0 |
| WILDCAT | 1 | 0 |
| WILDCAT | 1 | 0 |
Permits filed by year
| Year | Permits | Horizontal |
|---|---|---|
| 2026 | 53 | 53 |
| 2025 | 1 | 1 |
| 2024 | 19 | 19 |
| 2023 | 10 | 10 |
| 2022 | 20 | 20 |
| 2021 | 10 | 10 |
| 2020 | 24 | 24 |
| 2019 | 8 | 8 |
| 2018 | 7 | 7 |
| 2017 | 1 | 1 |
The permit feed carries a rolling recent window, so early years are partial. Well counts above come from the full current wellbore file.