Skip to content
Royalty Clerk

Texas gas well

Producing

MENSIK 01

Mensik 01 is a gas well in Karnes County, Texas, operated by Marathon Oil Ef LLC in the Sugarkane (Eagle Ford) field.

1 well

8,202mcf gas, last 12 months−75% vs prior year
Operator
Marathon Oil Ef LLC
County
Karnes County
Field
Sugarkane (Eagle Ford)
RRC lease
02-265657

Is your check right?

Check my statement

Where it sits

This county

Karnes CountyKarnesAtascosaGoliadWilsonGonzalesDe WittBexarKarnes County
Karnes County
Oil, last 12 months
324 bbl
Gas in Jul 2026
1,691 mcf

Production by month

Gas output fell 75% over the last 12 months

  • Gas (bars)
  • Oil (line)
  • Last 12 months
Gas output fell 75% over the last 12 monthsMonthly gas production and oil for MENSIK 01, Aug 2023 to Jul 2026. Gas output fell 75% over the last 12 months. 8,202 mcf in the 12 months through Jul 2026, against 32,348 mcf in the 12 months before.Last 12 months: 8,202 mcfmcf per monthbbl per month002,0005004,0001,0006,0001,5008,0002,000Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Gas output fell 75% over the last 12 monthsMonthly gas production and oil for MENSIK 01, Aug 2023 to Jul 2026. Gas output fell 75% over the last 12 months. 8,202 mcf in the 12 months through Jul 2026, against 32,348 mcf in the 12 months before.Last 12 monthsmcf per monthbbl per month002,0005004,0001,0006,0001,5008,0002,000Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

Where the gas went

96% of the gas went to a processing plant in the last 12 months

  • Processing plant (3)
  • Lease fuel (1)
96% of the gas went to a processing plant in the last 12 monthsShare of MENSIK 01 gas by disposition code each month, Aug 2023 to Jul 2026. 96% 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
96% of the gas went to a processing plant in the last 12 monthsShare of MENSIK 01 gas by disposition code each month, Aug 2023 to Jul 2026. 96% 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.

  • Processing plant (3)

    96% · 38,909 mcf

  • Lease fuel (1)

    4.0% · 1,641 mcf

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 MENSIK 01
API numberWell no.Status
42-255-3194801HActive

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

682.59 acres on the newest permit

Check your decimal on this lease
Permits for Mensik 01
API numberWell no.Acreson the permit
42-255-3194801H682.59

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 MENSIK 01
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 2026Marathon Oil68681,6911,6440$80.46$2.89
Jun 2026Marathon Oil1371371,9081,8500$84.81$3.15
May 2026Marathon Oil003633540$102.13$2.94
Apr 2026Marathon Oil1191194,2404,1480$100.32$2.77
Mar 2026Marathon Oil00000$91.38$3.04
Feb 2026Marathon Oil00000$64.51$3.62
Jan 2026Marathon Oil00000$60.04$7.72
Dec 2025Marathon Oil00000$57.97$4.26
Nov 2025Marathon Oil00000$60.06$3.79
Oct 2025Marathon Oil00000$60.89$3.19
Sep 2025Marathon Oil00000$63.96$2.97
Aug 2025Marathon Oil00000$64.86$2.91
Jul 2025Marathon Oil00000$68.39$3.20
Jun 2025Marathon Oil88882,7152,6740$68.17$3.02
May 2025Marathon Oil2182186,7346,6280$62.17$3.12
Apr 2025Marathon Oil2432437,4427,2100$63.54$3.42
Mar 2025Marathon Oil2522527,6797,1300$68.24$4.12
Feb 2025Marathon Oil00000$71.53$4.19
Jan 2025Marathon Oil97974514380$75.74$4.13
Dec 2024Marathon Oil99991,1191,0410$70.12$3.01
Nov 2024Marathon Oil00000$69.95$2.12
Oct 2024Marathon Oil00000$71.99$2.20
Sep 2024Marathon Oil1121122,2742,1240$70.24$2.28
Aug 2024Marathon Oil3213213,9343,6680$76.68$1.99
Jul 2024Marathon Oil1041041,7721,6590$81.80$2.07
Jun 2024Marathon Oil3693692,8962,7200$79.77$2.54
May 2024Marathon Oil4404403,1552,9780$80.02$2.12
Apr 2024Marathon Oil3193194,9754,7010$85.35$1.60
Mar 2024Marathon Oil2932937,0956,4820$81.28$1.49
Feb 2024Marathon Oil3383385,8165,3220$77.25$1.72
Jan 2024Marathon Oil6276272,4572,2890$74.15$3.18
Dec 2023Marathon Oil6866862,1041,9670$71.90$2.52
Nov 2023Marathon Oil6436434,5924,2360$77.69$2.71
Oct 2023Marathon Oil1,0131,0136,0185,5770$85.64$2.98
Sep 2023Marathon Oil1,2561,2562,8412,6530$89.43$2.64
Aug 2023Marathon Oil1,3081,3082,8222,6370$81.39$2.58

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 LLCFieldSugarkane (Eagle Ford)CountyKarnes County

Marathon Oil Ef LLC in Karnes County

All Marathon Oil Ef LLC leases →

Sugarkane (Eagle Ford) field

All leases in this field →

Leases within 10 km

Drilling permits within 10 km