Texas Mineral Radar → operators → MARATHON OIL EF LLC
MARATHON OIL EF LLC
RRC operator #525398 · permits 2026-08-26 · completions 2026-02-13 · well status 2026-09
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 143 drilling permits on record across 6 Texas counties (Karnes, Atascosa, Gonzales and 3 more), most recently on 2026-08-03. 143 of those permits are horizontal wells — the kind that can drain minerals a mile or more from the surface location.
Drilling permits
143
44 last year
Wells on record
1,946
1,564 producing
Horizontal permits
143
Counties
6
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Recent permits by MARATHON OIL EF LLC
| Filed | County | Lease | Type | Flags |
|---|---|---|---|---|
| 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 |
| 2026-05-28 | Karnes | WESTON-PMT SA C | Drill | Horiz |
| 2026-05-28 | Dewitt | HOPE-SAUNDERS B SA E | Drill | Horiz |
| 2026-05-28 | Dewitt | HOPE-SAUNDERS B SA D | Drill | Horiz |
| 2026-05-28 | Dewitt | HOPE-SAUNDERS B SA C | Drill | Horiz |
| 2026-05-28 | Dewitt | HOPE-SAUNDERS B SA B | Drill | Horiz |
| 2026-05-28 | Dewitt | HOPE-SAUNDERS B SA A | Drill | Horiz |
| 2026-05-28 | Dewitt | HOPE-DWOR-SAUN B SA A | Drill | Horiz |
| 2026-05-28 | Dewitt | SCHORLEMER QUAD SA A | Drill | Horiz |
| 2026-05-19 | Atascosa | GRIFFIN-KRUEGER SA 1 | Drill | Horiz |
| 2026-05-14 | Dewitt | SCHORLEMER-CHAR SA A | Drill | Horiz |
Where MARATHON OIL EF LLC operates
| County | Permits | Most recent |
|---|---|---|
| Karnes County | 59 | 2026-06-15 |
| Atascosa County | 38 | 2026-07-17 |
| Gonzales County | 31 | 2026-08-03 |
| Dewitt County | 12 | 2026-07-09 |
| Lavaca County | 2 | 2019-12-20 |
| Live Oak County | 1 | 2020-12-17 |
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 | 43 | 43 |
| 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.
This report compiles and structures publicly available oil & gas records from the Railroad Commission of Texas — drilling permits, completions, well status, and lease production. We monitor development activity and public filings near a location you tell us about; we do NOT determine mineral ownership, confirm what you own, or provide legal, tax, or investment advice. Nothing here replaces a title opinion, a landman, or reading the official RRC filing. Activity is mapped to the operator-filed permit surface location (NAD27, precision disclaimed by the RRC), not your mineral tract. Data is current only as of the source vintage shown on the page. Our total liability for any report is capped at the amount you paid for it. Found an error? Reply to any email and a human will correct it.