Skip to content
Royalty Clerk

Texas oil lease

Producing

BARNHART (EF)-J.M. PRESTON SA1

Barnhart (Ef)-J.m. Preston Sa1 is an oil lease in Gonzales County, Texas, operated by Marathon Oil Ef LLC in the Eagleville (Eagle Ford-1) field.

1 well

113,792bbl oil, last 12 months
Operator
Marathon Oil Ef LLC
County
Gonzales County
Field
Eagleville (Eagle Ford-1)
RRC lease
01-21712

Is your check right?

Check my statement

Where it sits

This county

Gonzales CountyGonzalesWilsonLavacaFayetteCaldwellBastropDe WittHaysGuadalupeGonzales County
Gonzales County
Gas, last 12 months
70,011 mcf
Oil in Jul 2026
7,440 bbl

Production by month

Oil output fell 56% since Jan 2025

  • Oil (bars)
  • Gas (line)
  • Last 12 months
Oil output fell 56% since Jan 2025Monthly oil production and gas for BARNHART (EF)-J.M. PRESTON SA1, Jan 2025 to Jul 2026. Oil output fell 56% since Jan 2025. Monthly average of 8,033 bbl in the latest 3 months, against 18,076 bbl in the first 3.Last 12 months: 113,792 bblbbl per monthmcf per month0010k5,00020k10k30k15k40k20kJan 25AprJulOctJan 26AprJul
Oil output fell 56% since Jan 2025Monthly oil production and gas for BARNHART (EF)-J.M. PRESTON SA1, Jan 2025 to Jul 2026. Oil output fell 56% since Jan 2025. Monthly average of 8,033 bbl in the latest 3 months, against 18,076 bbl in the first 3.Last 12 monthsbbl per monthmcf per month0010k5,00020k10k30k15k40k20kJan 25JulJan 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 last 12 months

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 last 12 monthsShare of BARNHART (EF)-J.M. PRESTON SA1 gas by disposition code each month, Jan 2025 to Jul 2026. 85% of the gas went to a processing plant in the last 12 months. 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%Jan 25AprJulOctJan 26AprJul
85% of the gas went to a processing plant in the last 12 monthsShare of BARNHART (EF)-J.M. PRESTON SA1 gas by disposition code each month, Jan 2025 to Jul 2026. 85% of the gas went to a processing plant in the last 12 months. Flaring peaked at 4.2% of the gas in May 2026.Share of gas by disposition code0%50%100%Flared 4.2%Jan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

  • Processing plant (3)

    85% · 59,446 mcf

  • Lease fuel (1)

    12% · 8,503 mcf

  • Flared (4)

    2.9% · 2,062 mcf

2.9% of the gas flared in the last 12 months. 5 months above 3%.

1 well on this lease

Wells on BARNHART (EF)-J.M. PRESTON SA1
API numberWell no.Status
42-177-34703115HActive

SourceTexas Railroad Commission Wellbore Query.

Buyers and gatherers

Companies named on the Form P-4, by product
CompanyProductRoleShare%From
Enterprise Crude Oil LLCOilGathers34Jan 27, 2025
Endeavor Crude, LLCOilGathers33Jan 27, 2025
Trafigura Trading LLCOilGathers33Jan 27, 2025
Marathon Oil Ef LLCCasinghead gasBuys100Jan 27, 2025
Marathon Oil Ef LLCCasinghead gasGathers100Jan 27, 2025

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

Who buys my oilOil price check

7,381.51 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.

  • Worth asking

    A Rule 37 case is listed

    The RRC permit records list a Rule 37 case. This does not establish your royalty share. Ask for the permit and unit plat for your well.

Check your decimal on this lease
Permits for Barnhart (Ef)-J.m. Preston Sa1
API numberWell no.Acreson the permit
42-177-34703115H7,381.51

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

19 months, newest first

Ledger for BARNHART (EF)-J.M. PRESTON SA1
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 20267,4407,4523,9423,30875$80.46$2.89
Jun 20267,4027,4064,0993,420157$84.81$3.15
May 20269,2589,2724,8453,983205$102.13$2.94
Apr 20269,3539,1865,6534,737217$100.32$2.77
Mar 20261,3171,43761850811$91.38$3.04
Feb 20269,2059,2476,5975,584181$64.51$3.62
Jan 202610,33110,2777,5796,371237$60.04$7.72
Dec 20259,1589,2246,0075,060137$57.97$4.26
Nov 202511,52211,5437,1016,080195$60.06$3.79
Oct 202512,39512,3047,8786,952129$60.89$3.19
Sep 202511,09511,1906,5775,697175$63.96$2.97
Aug 202515,31615,3189,1157,746343$64.86$2.91
Jul 202515,82315,8779,6928,75063$68.39$3.20
Jun 202517,32017,24910,4989,45387$68.17$3.02
May 202520,84320,81814,49513,064109$62.17$3.12
Apr 202521,58421,58714,02012,706179$63.54$3.42
Mar 202522,25022,27712,35211,336209$68.24$4.12
Feb 202527,95827,81815,19414,084204$71.53$4.19
Jan 20254,0203,9432,1311,95527$75.74$4.13

Flared above 3%

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

How to check your stub against this lease Checks stopped on this lease? See the likely reasons

Do your checks match this lease?

Check my statement

Nearby

This lease belongs to

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

Marathon Oil Ef LLC in Gonzales County

All Marathon Oil Ef LLC leases →

Eagleville (Eagle Ford-1) field

All leases in this field →

Leases within 10 km

Drilling permits within 10 km