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BARNHART (EF)-J.M. PRESTON SA10

Barnhart (Ef)-J.m. Preston Sa10 is an oil lease in Gonzales County, Texas, operated by Marathon Oil Ef LLC in the Eagleville (Eagle Ford-2) field.

1 well

106,459bbl oil, since Sep 2025
Operator
Marathon Oil Ef LLC
County
Gonzales County
Field
Eagleville (Eagle Ford-2)
RRC lease
02-13131

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Where it sits

This county

Gonzales CountyGonzalesWilsonLavacaFayetteCaldwellBastropDe WittHaysGuadalupeGonzales County
Gonzales County
Gas, since Sep 2025
57,256 mcf
Oil in Jul 2026
10,840 bbl

Checks stopped on this lease?

  • Buyer

    Buyer changed: ENSIGN NATURAL RESOURCES II LLC replaced MARATHON OIL EF LLC as the buyer of this lease's gas from oil wells on Sep 1, 2026.

SourceRailroad Commission production, P-5 and P-4 records, data through Jul 2026.

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Production by month

Oil output fell 34% since Sep 2025

  • Oil (bars)
  • Gas (line)
Oil output fell 34% since Sep 2025Monthly oil production and gas for BARNHART (EF)-J.M. PRESTON SA10, Sep 2025 to Jul 2026. Oil output fell 34% since Sep 2025. Monthly average of 8,894 bbl in the latest 3 months, against 13,403 bbl in the first 3.bbl per monthmcf per month005,0002,50010k5,00015k7,50020k10kOct 25Jan 26AprJul
Oil output fell 34% since Sep 2025Monthly oil production and gas for BARNHART (EF)-J.M. PRESTON SA10, Sep 2025 to Jul 2026. Oil output fell 34% since Sep 2025. Monthly average of 8,894 bbl in the latest 3 months, against 13,403 bbl in the first 3.bbl per monthmcf per month005,0002,50010k5,00015k7,50020k10kJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

Where the gas went

85% of the gas went to a processing plant in the 11 months reported

Flaring peaked at 4.2% of the gas in May 2026.

  • Processing plant (3)
  • Lease fuel (1)
  • Flared (4)
85% of the gas went to a processing plant in the 11 months reportedShare of BARNHART (EF)-J.M. PRESTON SA10 gas by disposition code each month, Sep 2025 to Jul 2026. 85% of the gas went to a processing plant in the 11 months reported. Flaring peaked at 4.2% of the gas in May 2026.Share of the lease’s gas by disposition code, per month0%50%100%Flared 4.2%Oct 25Jan 26AprJul
85% of the gas went to a processing plant in the 11 months reportedShare of BARNHART (EF)-J.M. PRESTON SA10 gas by disposition code each month, Sep 2025 to Jul 2026. 85% of the gas went to a processing plant in the 11 months reported. Flaring peaked at 4.2% of the gas in May 2026.Share of gas by disposition code0%50%100%Flared 4.2%Jan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

  • Processing plant (3)

    85% · 48,720 mcf

  • Lease fuel (1)

    12% · 6,971 mcf

  • Flared (4)

    2.7% · 1,565 mcf

2.7% of the gas flared in the 11 months reported. 4 months above 3%.

1 well on this lease

Wells on BARNHART (EF)-J.M. PRESTON SA10
API numberWell no.Status
42-177-34747125HActive

SourceTexas Railroad Commission Wellbore Query.

Buyers and gatherers

Companies named on the Form P-4, by product
CompanyProductRoleShare%FromUntil
Mv Purchasing, LLCOilGathers34Sep 1, 2026–
Plains Marketing, L.p.OilGathers33Sep 1, 2026–
Shell Trading (Us) CompanyOilGathers33Sep 1, 2026–
Ensign Natural Resources II LLCCasinghead gasBuys100Sep 1, 2026–
Ensign Natural Resources II LLCCasinghead gasGathers100Sep 1, 2026–
Marathon Oil Ef LLCCasinghead gasGathers100Oct 10, 2025Sep 1, 2026
Marathon Oil Ef LLCCasinghead gasBuys100Oct 10, 2025Sep 1, 2026
Endeavor Crude, LLCOilGathers33Oct 10, 2025Sep 1, 2026
Enterprise Crude Oil LLCOilGathers34Oct 10, 2025Sep 1, 2026
Trafigura Trading LLCOilGathers33Oct 10, 2025Sep 1, 2026

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

Who buys my oilOil price check

7,538.09 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 Barnhart (Ef)-J.m. Preston Sa10
API numberWell no.Acreson the permit
42-177-34747125H7,538.09

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

11 months, newest first

Ledger for BARNHART (EF)-J.M. PRESTON SA10
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 202610,84010,8135,1944,35899$80.46$2.89
Jun 20268,9298,8504,3893,662168$84.81$3.15
May 20266,9136,9773,1312,574132$102.13$2.94
Apr 20269,7199,5314,8494,063186$100.32$2.77
Mar 20265196652462024$91.38$3.04
Feb 20269,7449,7845,5414,690152$64.51$3.62
Jan 202610,71710,6526,0905,119191$60.04$7.72
Dec 20258,8688,9605,0084,219114$57.97$4.26
Nov 202512,76412,8227,3366,281202$60.06$3.79
Oct 202515,72215,5799,3078,212153$60.89$3.19
Sep 202511,72411,5856,1655,340164$63.96$2.97

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-2)CountyGonzales County

Marathon Oil Ef LLC in Gonzales County

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