OPERATORS · TEXAS · P-5 NUMBER 525398
Marathon Oil EF LLC
- P-5 status
- Active – Extension (X)RRC P-5 file of Oct 22, 2026
- P-5 last filed
- Oct 13, 2026
- Based in
- Houston, TX
- Most permits, 12 months
- Karnes County
Marathon Oil EF LLC was issued 55 drilling permits in the past 12 months, up 25% on the prior year, across 5 counties led by Karnes with 34. 100% were horizontal.
12 were issued in the past 90 days, down 40% on the prior quarter.
The RRC wellbore file lists 2,936 wells under its operatorship (2,457 producing, 226 shut in).
Lease reports credit it with 28.7M barrels of oil and 101M mcf of gas in the 12 months reported through August 2026, down 32% on the year before.
It holds 2 active disposal or injection permits, injecting 2.02M barrels in the 12 months reported through September 2025.
2,614 drilling permits have been issued to this operator number since 2010; its P-5 organization report was last filed October 13, 2026.
- 55
- permits, last 12 months
- +25%
- vs prior 12 months (44)
- 5
- counties, 12 months
- 2.46K
- producing wells, of 3.28K of record
- 1.84K
- leases it reports · 2,126 ever reported on
- 100%
- horizontal, 12 months
WINDOWS ON THE RRC ISSUE DATE · COMPUTED NOV 13, 2026
From permit to spud
FROM THE DATES ON ITS W-1 PERMITS · ALL TIME
A permit is a plan, not a well. These figures count only permits old enough to have spudded, six months and more, and read the spud, cancel, and expiry dates the RRC records on each one.
- 93%
- spud rate · 2,413 of 2,582 mature permits
- 81
- median days permit to spud · middle half 39–147
- 21
- spuds, last 180 days +24%
- 0%
- canceled · 0 permits
- 160
- expired undrilled
- 154
- permits a year over 17 active years
Permits issued by month
LAST 60 MONTHS · BY ISSUE DATE
Last 12 months 55 · prior 12 40(+38%)
Counties
Counties by permits in the last 12 months, with all-time permits and current wells of record there.
| County | 12 mo | All time | Wells | Last |
|---|---|---|---|---|
| Karnes county → | 34 | 1,571 | 1,766 | Oct 30, 2026 |
| De Witt county → | 8 | 64 | 261 | Jul 1, 2026 |
| Gonzales county → | 5 | 209 | 6 | Jul 21, 2026 |
| Atascosa county → | 4 | 516 | 499 | May 6, 2026 |
| Live Oak county → | 4 | 184 | 355 | Sep 21, 2026 |
| McMullen county → | — | 54 | 37 | Jan 28, 2019 |
| Lavaca county → | — | 14 | 0 | Apr 13, 2022 |
| Frio county → | — | 1 | 0 | Sep 25, 2013 |
| Wilson county → | — | 1 | 1 | May 10, 2012 |
All 2,614 permits, searchable → · Leases it reported on → · On the map →
Formations in wells it permitted
Tops reported on completion filings for wells permitted under this operator number, including wells others run today. RRC wellbore file. About tops →
| Formation | Wells | Permitted last 3 yrs |
|---|---|---|
| Austin Chalk | 2,339 | 151 |
| Eagle Ford | 1,885 | 117 |
| Wilcox | 1,789 | 149 |
| Queen City | 1,565 | 104 |
| Carrizo | 1,552 | 135 |
| Reklaw | 1,548 | 136 |
| Anacacho | 1,093 | 41 |
| Yegua | 945 | 10 |
| Frio | 425 | 7 |
| Olmos | 307 | 4 |
| Navarro | 250 | 1 |
| Bartosh | 190 | 0 |
| Cook Mountain | 133 | 5 |
| Escondido | 119 | 0 |
| Jackson | 92 | 0 |
Production by month
PDQ LEASE REPORTS · REPORTED THROUGH AUG 2026
Barrels on leases where this operator filed the production report. Lease-level by design; the latest months are revised upward as late reports arrive. From 2,126 leases it reported on; 144 are reported by other operators today; 138 are no longer on the schedule.How production is reported →
- 28.7M
- bbl oil, last 12 reported months
- -32%
- vs the 12 months before
- 101M
- mcf gas incl. casinghead, last 12
- 571M
- bbl oil since reporting began
12 months through Aug 2026 28,673,899 · prior 12 41,903,980(-32%)
Marathon Oil EF LLC: Oil by month.
Beyond the permit record
RRC wellbore file
Wells of record
RRC UIC permits · H-10 reported volumes
Disposal and injection
- 25K
- permitted bbl/day, active
- 2.02M
- bbl injected, last 12 reported months
- Sep 2025
- reported through
All 29 permits, with volumes → · On the map →
Permitted volume is a ceiling, not throughput. How to read it →
Operator of record and permit operator
3,014 wellbores of record
A well's operator of record is the RRC's, and its permit operator is the one on its latest drilling permit; neither fills in for the other. Its wellbores of record are counted as its wells, with its live permits; a well it permitted that another operator runs, or that the RRC lists with no operator at all, is not. Each count opens the wells it counts. Transfers and operator numbers →
Permit types
Last 12 months against the prior 12, and all time. A type opens the permit history filtered to it. What the types mean →
| Type | 12 mo | Prior 12 | All time |
|---|---|---|---|
| Drill | 54 | 44 | 2,575 |
| Recompletion | 1 | 0 | 22 |
| Field transfer | 0 | 0 | 15 |
| Reclass | 0 | 0 | 2 |
Fields
RRC regulatory fields with the most wells of record under this operator. The field opens its page; the count opens this operator's wells in it.
| Field | Wells | Producing |
|---|---|---|
| Eagleville (Eagle Ford-2)27135750 | 1,024 | 848 |
| Sugarkane (Eagle Ford)86950600 | 960 | 808 |
| Eagleville (Eagle Ford-1)27135700 | 519 | 444 |
| De Witt (Eagle Ford Shale)24492500 | 250 | 210 |
| Sugarkane (Austin Chalk)86950300 | 172 | 143 |
| Wildcat4001 | 3 | 0 |
| Flintstone (Cretaceous Chalk)31487500 | 2 | 2 |
| First Shot (Austin Chalk)30967100 | 2 | 0 |
| Fashing (Austin Chalk)30379100 | 1 | 1 |
| San Marcos (Austin Chalk)80280500 | 1 | 1 |
| Indio Tanks (Pearsall)44510500 | 1 | 0 |
| Pilgrim (Austin Chalk)71486100 | 1 | 0 |
P-5 organization report
As registered with the RRC. About the P-5 →
- Registration
- Status Active – Extension (X)
- RRC P-5 file of Oct 22, 2026
- Last filed Oct 13, 2026
- CSGD/GCSGD/PG/PURCondensate gatheringGas gatheringOil gatheringGas operatorOil operator
- Address
- PO Box 2197, Regulatory Dept
- Houston, TX 77252
- (832) 486-2737
- Officers and agents
- Lipford, Nelsy G · Secretary,texas Resident Agent
- Lisowksi, Alexandra P · Treasurer
- Hamilton, Leslie D · Assistant Tax Administration Off
- Gresh, Philip M III · Vice President
- Hoang, Lily N · General Tax Counsel
- King, Wendy D · President
- Hunter, Aaron M · Vice President
- Bode, Donna J · Tax Administrator
- All 15 on the P-5 →
Latest permits
NEWEST FIRST BY ISSUE DATE · FILED OR ON WELLS IT NOW OPERATES
About this data
Registration from the RRC P-5 organization file, loaded when the Commission posts a new one. Permits from the OGA049M master and daily daf420 files; wells of record from the EWA wellbore schedule; production from PDQ lease reports by the operator that filed them, through the statewide reported-through month; disposal from UIC permits and H-10 reports. Oil includes condensate from gas leases and gas includes casinghead gas from oil leases, as the RRC totals them. Summary figures are rebuilt nightly. Nothing is estimated.
Developers: this page as JSON is GET /v1/data/operators/tx/525398, documented in the API reference.