MARATHON OIL EF LLC
RRC operator 525398. In the 12 months to Jul 2026, MARATHON OIL EF LLC reported 29.2M barrels of oil and 104.5M MCF of gas on 1,971 Texas leases: #21 on Extrxct by oil-equivalent volume.
Oil + condensate (BBL per month, last 36 months)
Gas (MCF per month, last 36 months)
Jun 2026 and Jul 2026 are provisional (lighter bars) and usually rise as late reports arrive.
MARATHON OIL EF LLC in brief
MARATHON OIL EF LLC reported 29,216,060 barrels of oil and condensate and 104,473,064 MCF of gas on 1,971 Texas leases in the 12 months to Jul 2026. That is oil down 32% and gas down 34% versus the prior 12 months. Its largest counties by oil were Karnes, Atascosa and Gonzales, with Karnes County at 13,964,197 barrels. Its top lease was MIDDLE MCCOWEN in the EAGLEVILLE (EAGLE FORD-1) field. It received 3 new drilling permits between October 1 and Oct 14, 2026. Royalty owners paid by MARATHON OIL EF LLC can match the lease number on a check stub to the lease pages below.
Counties
| County | Oil (BBL) | Gas (MCF) |
|---|---|---|
| Karnes | 13,964,197 | 61,874,722 |
| Atascosa | 8,289,138 | 8,817,374 |
| Gonzales | 3,461,738 | 3,470,300 |
| De Witt | 1,589,811 | 15,375,982 |
| Live Oak | 1,434,706 | 13,639,667 |
| Mcmullen | 304,537 | 256,150 |
| Lavaca | 170,061 | 874,889 |
| Bee | 1,872 | 163,980 |
Top leases, last 12 months
| Lease | County | Field | Oil (BBL) | Gas (MCF) |
|---|---|---|---|---|
| MIDDLE MCCOWEN | Atascosa, Mcmullen | EAGLEVILLE (EAGLE FORD-1) | 3,408,305 | 2,528,022 |
| BARNHART (EF) | Gonzales | EAGLEVILLE (EAGLE FORD-1) | 994,496 | 1,247,981 |
| RIDLEY 01 | Karnes | SUGARKANE (EAGLE FORD) | 454,287 | 1,387,585 |
| DAVIS-MENSIK SA1 | Karnes | SUGARKANE (EAGLE FORD) | 269,276 | 1,380,929 |
| DAVIS-ALEXANDER SA1 | Karnes | SUGARKANE (EAGLE FORD) | 245,569 | 1,389,684 |
| MCS FOUNDATION UNIT | Atascosa | EAGLEVILLE (EAGLE FORD-1) | 384,325 | 437,213 |
| REYNOLDS GAS UNIT 2 | Karnes | EAGLEVILLE (EAGLE FORD-2) | 286,429 | 900,544 |
| ELIZONDO 01 | Karnes | SUGARKANE (EAGLE FORD) | 192,972 | 1,057,175 |
| ELIZONDO 01 | Karnes | SUGARKANE (EAGLE FORD) | 192,728 | 1,005,793 |
| ELIZONDO 01 | Karnes | SUGARKANE (EAGLE FORD) | 210,015 | 871,460 |
| PATINO-FRANKE UNIT SA1 | Karnes | SUGARKANE (EAGLE FORD) | 99,653 | 1,118,870 |
| KOOPMAN 01-L 01-S 01-A 01 SA2 | De Witt | DE WITT (EAGLE FORD SHALE) | 92,222 | 999,610 |
| EDWARD ROEDER-JAMES GANO SA1 | De Witt | DE WITT (EAGLE FORD SHALE) | 114,945 | 836,477 |
| DEMING-LONG SA1 | Karnes | SUGARKANE (EAGLE FORD) | 88,443 | 956,530 |
| EDWARD ROEDER-MIGURA A SA1 | De Witt | DE WITT (EAGLE FORD SHALE) | 117,037 | 661,422 |
| HIERHOLZER RETZLOFF-MCMAHON SA1 | Atascosa | EAGLEVILLE (EAGLE FORD-1) | 174,826 | 296,030 |
| GRIFFIN-KRUEGER SA4 | Atascosa | EAGLEVILLE (EAGLE FORD-1) | 182,123 | 202,012 |
| R MAY A-MAY GIRLS CHAPMAN SA2 | Atascosa | EAGLEVILLE (EAGLE FORD-1) | 168,926 | 245,299 |
| DEMING-DEBILL SA1 | Karnes | SUGARKANE (EAGLE FORD) | 68,961 | 840,769 |
| HIERHOLZER RETZLOFF-MCMAHON SA3 | Atascosa | EAGLEVILLE (EAGLE FORD-1) | 164,866 | 262,157 |
| GUAJILLO EAST | Atascosa | EAGLEVILLE (EAGLE FORD-1) | 171,228 | 203,505 |
| KOOPMAN 01-L 01-S 01-A 01 SA1 | De Witt | DE WITT (EAGLE FORD SHALE) | 58,700 | 861,057 |
| R MAY A-SCHROEDER CHAPMAN SA1 | Atascosa | EAGLEVILLE (EAGLE FORD-1) | 157,727 | 239,565 |
| PATINO UNIT | Karnes | SUGARKANE (EAGLE FORD) | 49,626 | 881,694 |
| PATINO UNIT | Karnes | SUGARKANE (AUSTIN CHALK) | 72,442 | 726,031 |
New permits this month
| Issued | County | Operator | Lease | Well | Total depth (ft) | Type |
|---|---|---|---|---|---|---|
| 2026-10-08 | Karnes | MARATHON OIL EF LLC | SPRENCEL-PECK UNIT | 3H | 11,428 | 14 |
| 2026-10-01 | Karnes | MARATHON OIL EF LLC | HAUS QUAD SA A | 1 | 17,500 | Drill |
| 2026-10-01 | Karnes | MARATHON OIL EF LLC | HAUS-JAU-CHRIS SA B | 1 | 17,500 | Drill |
Source: Texas Railroad Commission (data sets, Production Data Query). Data date: RRC Production Data Query dump, extract dated Sep 18, 2026; production through Jul 2026. Jun 2026 and Jul 2026 are provisional: operators file late and amend, so these months usually rise in later releases. Oil = crude oil + condensate (BBL); gas = gas-well gas + casinghead gas (MCF), as reported to RRC. Operator names are as registered with RRC; a lease is credited to its operator of record each month. Methodology.