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HIERHOLZER RETZLOFF-MCMAHON SA1

Hierholzer Retzloff-McMahon Sa1 is an oil lease in Atascosa County, Texas, operated by Marathon Oil Ef LLC in the Eagleville (Eagle Ford-1) field.

1 well

174,826bbl oil, last 12 months
Operator
Marathon Oil Ef LLC
County
Atascosa County
Field
Eagleville (Eagle Ford-1)
RRC lease
01-21771

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Where it sits

This county

Atascosa CountyAtascosaWilsonMedinaKarnesFrioBexarAtascosa County
Atascosa County
Gas, last 12 months
296,030 mcf
Oil in Jul 2026
10,476 bbl

Production by month

Oil output fell 70% since Mar 2025

  • Oil (bars)
  • Gas (line)
Oil output fell 70% since Mar 2025Monthly oil production and gas for HIERHOLZER RETZLOFF-MCMAHON SA1, Mar 2025 to Jul 2026. Oil output fell 70% since Mar 2025. Monthly average of 11,230 bbl in the latest 3 months, against 37,718 bbl in the first 3.bbl per monthmcf per month0010k10k20k20k30k30k40k40k50k50kApr 25JulOctJan 26AprJul
Oil output fell 70% since Mar 2025Monthly oil production and gas for HIERHOLZER RETZLOFF-MCMAHON SA1, Mar 2025 to Jul 2026. Oil output fell 70% since Mar 2025. Monthly average of 11,230 bbl in the latest 3 months, against 37,718 bbl in the first 3.bbl per monthmcf per month0010k10k20k20k30k30k40k40k50k50kJul 25Jan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

Where the gas went

87% of the gas went to a processing plant in the last 12 months

Flaring peaked at 4.1% of the gas in Aug 2025.

  • Processing plant (3)
  • Lease fuel (1)
  • Flared (4)
87% of the gas went to a processing plant in the last 12 monthsShare of HIERHOLZER RETZLOFF-MCMAHON SA1 gas by disposition code each month, Mar 2025 to Jul 2026. 87% of the gas went to a processing plant in the last 12 months. Flaring peaked at 4.1% of the gas in Aug 2025.Share of the lease’s gas by disposition code, per month0%50%100%Flared 4.1%Apr 25JulOctJan 26AprJul
87% of the gas went to a processing plant in the last 12 monthsShare of HIERHOLZER RETZLOFF-MCMAHON SA1 gas by disposition code each month, Mar 2025 to Jul 2026. 87% of the gas went to a processing plant in the last 12 months. Flaring peaked at 4.1% of the gas in Aug 2025.Share of gas by disposition code0%50%100%Flared 4.1%Jul 25Jan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

  • Processing plant (3)

    87% · 256,640 mcf

  • Lease fuel (1)

    12% · 35,938 mcf

  • Flared (4)

    1.2% · 3,452 mcf

1.2% of the gas flared in the last 12 months. 2 months above 3%.

1 well on this lease

Wells on HIERHOLZER RETZLOFF-MCMAHON SA1
API numberWell no.Status
42-013-361871HActive

SourceTexas Railroad Commission Wellbore Query.

Buyers and gatherers

Companies named on the Form P-4, by product
CompanyProductRoleShare%From
Genesis Crude Oil, L.p.OilGathers34Aug 18, 2025
Reynolds Energy Transport LLCOilGathers33Aug 18, 2025
Statewide Crude Inc.OilGathers33Aug 18, 2025
Marathon Oil Ef LLCCasinghead gasBuys100Aug 18, 2025
Marathon Oil Ef LLCCasinghead gasGathers100Aug 18, 2025

SourceRailroad Commission Form P-4 file, Sep 24, 2026 (source).

Who buys my oilOil price check

1,000 acres on the newest permit

  • Worth asking

    An allocation well is on this lease

    A well drilled across several tracts shares its production by an allocation formula, so the decimal is not always your acres over the unit acres. Ask the operator for the allocation formula and the tract factor for your land.

Check your decimal on this lease
Permits for Hierholzer Retzloff-McMahon Sa1
API numberWell no.Acreson the permit
42-013-361871H1,000

SourceRailroad Commission drilling permits, Oct 3, 2026 (source 1, source 2).

Unit decimal checker

What ConocoPhillips told investors it received

Marathon Oil Ef LLC is linked to ConocoPhillips (MRO).
Realized prices reported by ConocoPhillips
QuarterOil$ per bblFiling
Q2 2026$99.40SEC filing
Q1 2026$73.47SEC filing
Q3 2025$66.13SEC filing
Q2 2025$64.23SEC filing
Q1 2025$71.65SEC filing

SourceConocoPhillips quarterly reports, SEC EDGAR, company-wide averages before hedging.

Estimate your royalty

17 months, newest first

Ledger for HIERHOLZER RETZLOFF-MCMAHON SA1
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 202610,47610,42716,62014,018140$80.46$2.89
Jun 202611,44211,45623,67419,96986$84.81$3.15
May 202611,77111,83221,54617,714185$102.13$2.94
Apr 202614,10014,06122,30019,96486$100.32$2.77
Mar 202614,55414,61526,57224,095108$91.38$3.04
Feb 202612,60812,51817,75515,95097$64.51$3.62
Jan 202619,14219,14127,56525,178104$60.04$7.72
Dec 20258,4488,48617,66214,870140$57.97$4.26
Nov 202514,92114,93928,46724,096378$60.06$3.79
Oct 202515,73115,78228,76325,813168$60.89$3.19
Sep 202518,57618,69030,65726,667553$63.96$2.97
Aug 202523,05722,90634,44928,3061,407$64.86$2.91
Jul 202522,80822,77830,37125,161922$68.39$3.20
Jun 202522,14722,16626,22322,478747$68.17$3.02
May 202532,85832,81937,30632,240687$62.17$3.12
Apr 202537,63137,66343,55637,372887$63.54$3.42
Mar 202542,66542,47641,84535,962998$68.24$4.12

Flared above 3%

SourceTexas Railroad Commission Production Data Query, through Jul 2026. Prices: EIA, through Aug 2026. Updated Oct 2, 2026.

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Nearby

This lease belongs to

OperatorMarathon Oil Ef LLCFieldEagleville (Eagle Ford-1)CountyAtascosa County

Marathon Oil Ef LLC in Atascosa County

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Eagleville (Eagle Ford-1) field

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