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Royalty Clerk

RRC operator 525398

Marathon Oil Ef LLC

Marathon Oil Ef LLC reported 29 million barrels of oil and 104 million mcf of gas in the last 12 months.

Operator dossier

29,216,060bbl oil, last 12 months−32% vs prior year
Producing leases
1,561of 1,980 on record
Counties
8
Biggest county
Karnes County
Biggest field
Eagleville (Eagle Ford-1)

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Where they work

fewermore

Atascosa County: 111 producing leasesLavaca County: 19 producing leasesMcMullen County: 2 producing leasesGonzales County: 61 producing leasesKarnes County: 932 producing leasesDe Witt County: 213 producing leasesBee County: 11 producing leasesLive Oak County: 212 producing leasesAtascosaGonzalesKarnes
8 counties
Gas, last 12 months
104,473,064 mcf
Fields
7
Data through
Jul 2026
Leases on record
1,980

Five years of Marathon Oil Ef LLC output

Oil output from Marathon Oil Ef LLC fell 32% over the last 12 months

29M bbl through Jul 2026, against 43M bbl a year earlier. Peak Jul 2024: 4.5M bbl.

Oil output from Marathon Oil Ef LLC fell 32% over the last 12 months29M bbl through Jul 2026, against 43M bbl a year earlier. Peak Jul 2024: 4.5M bbl.Oil, bbl per month01M2M3M4M5MPeak 4.5M (Jul 24)2.1M20222023202420252026
Oil output from Marathon Oil Ef LLC fell 32% over the last 12 months29M bbl through Jul 2026, against 43M bbl a year earlier. Peak Jul 2024: 4.5M bbl.Oil, bbl per month01M2M3M4M5MPeak 4.5M (Jul 24)2.1M'22'23'24'25'26

Gas output from Marathon Oil Ef LLC fell 34% over the last 12 months

104M mcf through Jul 2026, against 159M mcf a year earlier. Peak Jul 2023: 16M mcf.

Gas output from Marathon Oil Ef LLC fell 34% over the last 12 months104M mcf through Jul 2026, against 159M mcf a year earlier. Peak Jul 2023: 16M mcf.Gas, mcf per month05M10M15M20MPeak 16M (Jul 23)7.6M20222023202420252026
Gas output from Marathon Oil Ef LLC fell 34% over the last 12 months104M mcf through Jul 2026, against 159M mcf a year earlier. Peak Jul 2023: 16M mcf.Gas, mcf per month05M10M15M20MPeak 16M (Jul 23)7.6M'22'23'24'25'26

SourceTexas Railroad Commission Production Data Query, operator 525398, through Jul 2026, file dated Sep 18, 2026.

Marathon Oil Ef LLC leases, biggest first

Under each volume: change on the year before.

Showing 25 of 150 (the 150 largest of 1,561), ranked by output value.

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SourceTexas Railroad Commission Production Data Query.

Counties and fields where Marathon Oil Ef LLC produces

Counties, by Marathon Oil Ef LLC oil

Karnes County leads

  1. Karnes County932 leases14Mbbl
  2. Atascosa County111 leases8.6Mbbl
  3. Gonzales County61 leases3.5Mbbl
  4. De Witt County213 leases1.6Mbbl
  5. Live Oak County212 leases1.4Mbbl
  6. Lavaca County19 leases170kbbl
  7. McMullen County2 leases25.2kbbl
  8. Bee County11 leases1,872bbl

Fields, by Marathon Oil Ef LLC oil

Eagleville (Eagle Ford-1) leads

  1. Eagleville (Eagle Ford-1)156 leases · District 01 · Field 2713570011Mbbl
  2. Eagleville (Eagle Ford-2)388 leases · District 02 · Field 2713575010Mbbl
  3. Sugarkane (Eagle Ford)684 leases · District 02 · Field 869506006.3Mbbl
  4. De Witt (Eagle Ford Shale)196 leases · District 02 · Field 244925001.3Mbbl
  5. Sugarkane (Austin Chalk)135 leases · District 02 · Field 86950300785kbbl
  6. Fashing (Austin Chalk)1 lease · District 01 · Field 303791002,348bbl
  7. San Marcos (Austin Chalk)1 lease · District 02 · Field 8028050051bbl

Recent drilling permits for Marathon Oil Ef LLC

Where the gas of Marathon Oil Ef LLC went

Plants
90%
Pipelines
0.0%
Lease fuel
9.5%
Flared or vented
0.6%

SourceTexas Railroad Commission Production Data Query, last 12 months. What the codes mean