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Texas gas well

Producing

ROBERT GRUNDER 01

Robert Grunder 01 is a gas well in De Witt County, Texas, operated by Marathon Oil Ef LLC in the De Witt (Eagle Ford Shale) field.

1 well

1,984mcf gas, last 12 months−67% vs prior year
Operator
Marathon Oil Ef LLC
County
De Witt County
Field
De Witt (Eagle Ford Shale)
RRC lease
02-267709

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Where it sits

This county

De Witt CountyDe WittGoliadWilsonLavacaGonzalesKarnesVictoriaGuadalupeDe Witt County
De Witt County
Oil, last 12 months
105 bbl
Gas in Jul 2026
6 mcf

Checks stopped on this lease?

  • Sales

    Sales over the last 3 months fell to 17% of the 9 months before.

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

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Production by month

Gas output fell 67% over the last 12 months

  • Gas (bars)
  • Oil (line)
  • Last 12 months
Gas output fell 67% over the last 12 monthsMonthly gas production and oil for ROBERT GRUNDER 01, Aug 2023 to Jul 2026. Gas output fell 67% over the last 12 months. 1,984 mcf in the 12 months through Jul 2026, against 6,048 mcf in the 12 months before.Last 12 months: 1,984 mcfmcf per monthbbl per month002502050040750601,000801,250100Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Gas output fell 67% over the last 12 monthsMonthly gas production and oil for ROBERT GRUNDER 01, Aug 2023 to Jul 2026. Gas output fell 67% over the last 12 months. 1,984 mcf in the 12 months through Jul 2026, against 6,048 mcf in the 12 months before.Last 12 monthsmcf per monthbbl per month002502050040750601,000801,250100Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

Where the gas went

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

All of the gas went to a processing plant in the last 12 monthsShare of ROBERT GRUNDER 01 gas by disposition code each month, Aug 2023 to Jul 2026. All of the gas went to a processing plant in the last 12 months.Share of the lease’s gas by disposition code, per month0%50%100%Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
All of the gas went to a processing plant in the last 12 monthsShare of ROBERT GRUNDER 01 gas by disposition code each month, Aug 2023 to Jul 2026. All of the gas went to a processing plant in the last 12 months.Share of gas by disposition code0%50%100%Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

Who has run this lease

The operator changed once, most recently in Mar 2023

Operators of this lease over timeEnsign Operating LLC, Jan 2020 to Feb 2023; Marathon Oil Ef LLC, Mar 2023 to Jul 20262020202120222023202420252026Changed Mar 2023Ensign Operating LLCJan 2020 to Feb 2023Marathon Oil Ef LLCMar 2023 to now
Operators of this lease over timeEnsign Operating LLC, Jan 2020 to Feb 2023; Marathon Oil Ef LLC, Mar 2023 to Jul 20262020202120222023202420252026Changed Mar 2023Ensign Operating LLCJan 2020 to Feb 2023Marathon Oil Ef LLCMar 2023 to now

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

1 well on this lease

Wells on ROBERT GRUNDER 01
API numberWell no.Status
42-123-3241901HActive

SourceTexas Railroad Commission Wellbore Query.

Buyers and gatherers

Companies named on the Form P-4, by product
CompanyProductRoleShare%FromUntil
Enterprise Crude Oil LLCCondensateGathers50Mar 1, 2023–
Enterprise Crude Pipeline LLCCondensateGathers50Mar 1, 2023–
Marathon Oil Ef LLCGas-well gasBuys100Mar 1, 2023–
Marathon Oil Ef LLCGas-well gasGathers100Mar 1, 2023–
Gulfmark Energy, Inc.CondensateGathers100Oct 2, 2019Mar 1, 2023
Ensign Operating LLCGas-well gasGathers100Oct 2, 2019Mar 1, 2023
Ensign Operating LLCGas-well gasBuys100Oct 2, 2019Mar 1, 2023
Ensign Operating LLCCondensateGathers50Oct 1, 2019Oct 2, 2019
Enterprise Crude Oil LLCCondensateGathers25Oct 1, 2019Oct 2, 2019
Enterprise Crude Pipeline LLCCondensateGathers25Oct 1, 2019Oct 2, 2019

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

Who buys my oilOil price check

505.53 acres on the newest permit

Check your decimal on this lease
Permits for Robert Grunder 01
API numberWell no.Acreson the permit
42-123-3241901H505.53

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

36 months, newest first

Ledger for ROBERT GRUNDER 01
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 2026Marathon Oil55660$80.46$2.89
Jun 2026Marathon Oil551001000$84.81$3.15
May 2026Marathon Oil00000$102.13$2.94
Apr 2026Marathon Oil4469690$100.32$2.77
Mar 2026Marathon Oil00000$91.38$3.04
Feb 2026Marathon Oil4431310$64.51$3.62
Jan 2026Marathon Oil9971710$60.04$7.72
Dec 2025Marathon Oil00000$57.97$4.26
Nov 2025Marathon Oil11112562560$60.06$3.79
Oct 2025Marathon Oil24246946940$60.89$3.19
Sep 2025Marathon Oil23233633630$63.96$2.97
Aug 2025Marathon Oil20203943940$64.86$2.91
Jul 2025Marathon Oil18182072070$68.39$3.20
Jun 2025Marathon Oil0041410$68.17$3.02
May 2025Marathon Oil00000$62.17$3.12
Apr 2025Marathon Oil6614140$63.54$3.42
Mar 2025Marathon Oil00000$68.24$4.12
Feb 2025Marathon Oil14144314310$71.53$4.19
Jan 2025Marathon Oil22228168160$75.74$4.13
Dec 2024Marathon Oil29298878870$70.12$3.01
Nov 2024Marathon Oil26268648640$69.95$2.12
Oct 2024Marathon Oil28289679670$71.99$2.20
Sep 2024Marathon Oil26268668660$70.24$2.28
Aug 2024Marathon Oil34349559550$76.68$1.99
Jul 2024Marathon Oil19199109100$81.80$2.07
Jun 2024Marathon Oil27278918910$79.77$2.54
May 2024Marathon Oil55559729720$80.02$2.12
Apr 2024Marathon Oil22228128120$85.35$1.60
Mar 2024Marathon Oil51519719710$81.28$1.49
Feb 2024Marathon Oil39399069060$77.25$1.72
Jan 2024Marathon Oil89898288280$74.15$3.18
Dec 2023Marathon Oil48481,0711,0710$71.90$2.52
Nov 2023Marathon Oil46469199190$77.69$2.71
Oct 2023Marathon Oil33337567560$85.64$2.98
Sep 2023Marathon Oil43438768760$89.43$2.64
Aug 2023Marathon Oil44447537530$81.39$2.58

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 LLCFieldDe Witt (Eagle Ford Shale)CountyDe Witt County

Marathon Oil Ef LLC in De Witt County

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De Witt (Eagle Ford Shale) field

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