MARATHON OIL EF LLC
Reported value by year
What MARATHON OIL EF LLC's leases reported, valued at the published monthly benchmark and summed by year. This is the state's volume times a published price — not what the company was paid, which no free source publishes.
Inspections and violations
What the Railroad Commission's field inspectors recorded at this operator's facilities. An inspection count tracks how much this operator runs in Texas; the rate beside it is what the inspectors found.
| Rule | What the Commission cited it for | Violations |
|---|---|---|
| SWR 3.8(d)(1) | Unpermitted Disposal of Oil and Gas Wastes | 77 |
| SWR 3.91(d)(1) | Remediation of Soil | 17 |
| SWR 3.14(b)(2) | Inactive Unplugged Well | 10 |
| SWR 3.2(a) | Access to Property | 5 |
| SWR 4.103(a) | Unpermitted Disposal of Oil and Gas Wastes | 4 |
The five commonest of 15 rules cited against this operator.
What the Commission did
- Notice of Violation 127
- Referred to Austin Field Ops for possible legal enforcement 1
- Violation Corrected 1
From the Commission's inspection and violation files, covering Aug 1 2015 to Aug 7 2026. The two are separate files with no key between them, so the violations here are not a subset of the 142 inspections that found this operator out of compliance — they are counted from their own file. 12 of the violations were still uncorrected when the inspector returned.
Commission dockets
Cases the Railroad Commission opened naming this operator. Most dockets are applications — commonly for an exception to the statewide spacing rule — and a small number are compliance orders.
| Type | What the Commission's remarks call it | Dockets |
|---|---|---|
| A37 | Rule 37 spacing exception | 525 |
| R38 | Rule 38 well-density exception | 424 |
| 7A8 | Rule 37 or 38 exception | 76 |
| R10 | no published meaning for this code | 9 |
| R37 | Rule 37 docket | 6 |
The five commonest of 11 types this operator carries.
From the Commission's docket file published 2025-02-05. It is the only copy on the Commission's link, so nothing filed after that date appears here. The dates shown are the earliest and latest the record carries — 2 Dec 2011 to 25 Apr 2024. The file holds eight date fields per docket and the Commission publishes no key to which is which, so none is named here.
Leases
Every lease is a page of its own: the monthly volumes the state published, multiplied by the monthly price. Value is lifetime, from Jan 1993.
50 of 1,974 leases
| MIDDLE MCCOWEN01/15638 | Oil lease | $2.19 bn |
| BARNHART (EF)01/15397 | Oil lease | $1.11 bn |
| GUAJILLO EAST01/17741 | Oil lease | $632.2 M |
| R. MAY B01/16361 | Oil lease | $403.6 M |
| BORIS UNIT02/10478 | Oil lease | $249.6 M |
| RIDLEY 0102/11355 | Oil lease | $240.3 M |
| JULIE BECK02/9944 | Oil lease | $240.3 M |
| CHALLENGER UNIT C02/10446 | Oil lease | $239.8 M |
| THREE SISTERS 0102/11430 | Oil lease | $233.5 M |
| WINGNUT UNIT 'A'02/10372 | Oil lease | $229.8 M |
| WINGNUT UNIT 'B'02/10366 | Oil lease | $214.6 M |
| CHALLENGER UNIT A02/10519 | Oil lease | $210.0 M |
| CHALLENGER UNIT B02/10434 | Oil lease | $193.3 M |
| MOHR-HONS UNIT02/10091 | Oil lease | $188.1 M |
| R. MAY A01/16012 | Oil lease | $180.2 M |
| KARNES CITY NE UNIT02/10810 | Oil lease | $174.6 M |
| JAUER-SONKA UNIT02/10590 | Oil lease | $174.5 M |
| MAY UNIT 102/10912 | Oil lease | $173.9 M |
| KARNES CITY SE UNIT02/10852 | Oil lease | $166.0 M |
| KARNES CITY SW UNIT02/10724 | Oil lease | $163.1 M |
| MAY-CHAPMAN01/16009 | Oil lease | $155.5 M |
| CARTER UNIT02/9683 | Oil lease | $152.9 M |
| 74 RANCH UNIT S301/20608 | Oil lease | $152.5 M |
| COY CITY RANCH UNIT B02/10375 | Oil lease | $152.2 M |
| EGBERT UNIT02/9964 | Oil lease | $150.5 M |
| SALGE-BUSSELMAN UNIT02/9884 | Oil lease | $147.4 M |
| SAN CHRISTOVAL RANCH UNIT A02/10836 | Oil lease | $147.1 M |
| TURNBULL UNIT D02/10654 | Oil lease | $146.7 M |
| DRAKE-BORCHERS UNIT01/17245 | Oil lease | $143.5 M |
| GIDEON CAZADORES HENKE UNIT02/10412 | Oil lease | $142.9 M |
| BURROW02/10274 | Oil lease | $139.2 M |
| MEDINA-HOFFMAN UNIT02/10039 | Oil lease | $138.1 M |
| MEDINA-JONAS UNIT A02/9889 | Oil lease | $134.7 M |
| CARTER-HOLM UNIT02/10089 | Oil lease | $133.0 M |
| GUAJILLO WEST01/19097 | Oil lease | $132.7 M |
| MCCOY-EGBERT UNIT02/10387 | Oil lease | $130.9 M |
| KEMPE-LAUBACH UNIT02/10176 | Oil lease | $130.2 M |
| COY CITY RANCH A UNIT02/9806 | Oil lease | $129.5 M |
| RIPPSTEIN-RAFTER UNIT02/9917 | Oil lease | $129.3 M |
| LABUS PITTMAN UNIT02/11138 | Oil lease | $128.9 M |
| BARNHART (EF) K01/17273 | Oil lease | $128.8 M |
| HONS BRODSKY UNIT02/10543 | Oil lease | $128.8 M |
| RIPPSTEIN-GOTTHARDT UNIT02/9923 | Oil lease | $128.6 M |
| 74 RANCH UNIT S201/20617 | Oil lease | $128.3 M |
| RIPPSTEIN-MIKKELSON UNIT02/9815 | Oil lease | $126.4 M |
| OXFORD UNIT02/9825 | Oil lease | $125.5 M |
| KARNES CITY NW UNIT02/11069 | Oil lease | $124.9 M |
| FORISTER 541 UNIT B02/9879 | Oil lease | $123.8 M |
| MCCOY-RAFTERS UNIT02/10609 | Oil lease | $123.3 M |
| RODRIGUEZ-TRIAL UNIT02/10740 | Oil lease | $123.1 M |
Pipeline systems
The named networks MARATHON OIL EF LLC operates. One physical pipeline is usually filed as hundreds of segments, so a system — not a segment — is the unit worth reading.