Skip to content
Royalty Clerk

Texas oil lease

Producing

CHALLENGER UNIT C-B SA

Challenger Unit C-B Sa is an oil lease in Karnes County, Texas, operated by Marathon Oil Ef LLC in the Eagleville (Eagle Ford-2) field.

1 well

19,260bbl oil, last 12 months−32% vs prior year
Operator
Marathon Oil Ef LLC
County
Karnes County
Field
Eagleville (Eagle Ford-2)
RRC lease
02-12092

Is your check right?

Check my statement

Where it sits

This county

Karnes CountyKarnesAtascosaGoliadWilsonGonzalesDe WittBexarKarnes County
Karnes County
Gas, last 12 months
32,854 mcf
Oil in Jul 2026
2 bbl

Production by month

Oil output fell 32% over the last 12 months

  • Oil (bars)
  • Gas (line)
  • Last 12 months
Oil output fell 32% over the last 12 monthsMonthly oil production and gas for CHALLENGER UNIT C-B SA, Aug 2023 to Jul 2026. Oil output fell 32% over the last 12 months. 19,260 bbl in the 12 months through Jul 2026, against 28,490 bbl in the 12 months before.Last 12 months: 19,260 bblbbl per monthmcf per month001,0002,0002,0004,0003,0006,0004,0008,000Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output fell 32% over the last 12 monthsMonthly oil production and gas for CHALLENGER UNIT C-B SA, Aug 2023 to Jul 2026. Oil output fell 32% over the last 12 months. 19,260 bbl in the 12 months through Jul 2026, against 28,490 bbl in the 12 months before.Last 12 monthsbbl per monthmcf per month001,0002,0002,0004,0003,0006,0004,0008,000Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

Where the gas went

Since Feb 2024 the lease's gas goes to a processing plant instead of lease fuel

  • Processing plant (3)
  • Lease fuel (1)
  • Flared (4)
Since Feb 2024 the lease's gas goes to a processing plant instead of lease fuelShare of CHALLENGER UNIT C-B SA gas by disposition code each month, Aug 2023 to Jul 2026. Since Feb 2024 the lease's gas goes to a processing plant instead of lease fuel.Share of the lease’s gas by disposition code, per month0%50%100%Feb 2024: fuel to plantOct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Since Feb 2024 the lease's gas goes to a processing plant instead of lease fuelShare of CHALLENGER UNIT C-B SA gas by disposition code each month, Aug 2023 to Jul 2026. Since Feb 2024 the lease's gas goes to a processing plant instead of lease fuel.Share of gas by disposition code0%50%100%Feb 24: fuel to plantJan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

  • Processing plant (3)

    75% · 28,054 mcf

  • Lease fuel (1)

    23% · 8,761 mcf

  • Flared (4)

    1.3% · 485 mcf

1.3% of the gas flared in the last 12 months. No month above 3%.

1 well on this lease

Wells on CHALLENGER UNIT C-B SA
API numberWell no.Status
42-255-369431HActive

SourceTexas Railroad Commission Wellbore Query.

Buyers and gatherers

Companies named on the Form P-4, by product
CompanyProductRoleShare%FromUntil
Enterprise Crude Oil LLCOilGathers25Jul 1, 2022–
Harvest Midstream CompanyOilGathers25Jul 1, 2022–
Reynolds Energy Transport LLCOilGathers25Jul 1, 2022–
Trafigura Trading LLCOilGathers25Jul 1, 2022–
Marathon Oil Ef LLCCasinghead gasBuys100Aug 31, 2020–
Marathon Oil Ef LLCCasinghead gasGathers100Aug 31, 2020–
Enterprise Crude Oil LLCOilGathers1Aug 31, 2020Jul 1, 2022
Gulfmark Energy, Inc.OilGathers1Aug 31, 2020Jul 1, 2022
Harvest Midstream CompanyOilGathers97Aug 31, 2020Jul 1, 2022
Trafigura Trading LLCOilGathers1Aug 31, 2020Jul 1, 2022

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

Who buys my oilOil price check

961.75 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 Challenger Unit C-B Sa
API numberWell no.Acreson the permit
42-255-369431H961.75

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 CHALLENGER UNIT C-B SA
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 202628000$80.46$2.89
Jun 20262212815454054$84.81$3.15
May 20262,2842,2725,0613,78982$102.13$2.94
Apr 20261,7991,7793,5422,72549$100.32$2.77
Mar 20261,3361,3722581962$91.38$3.04
Feb 20262,1482,1184,6603,45435$64.51$3.62
Jan 20261,6071,6152,6862,04323$60.04$7.72
Dec 20251,5831,5821,5691,22610$57.97$4.26
Nov 20251,6431,6382,3681,88314$60.06$3.79
Oct 20252,0522,0603,6552,91927$60.89$3.19
Sep 20252,1182,1244,2303,32887$63.96$2.97
Aug 20252,4672,4614,2803,04771$64.86$2.91
Jul 20252,7002,6904,4463,03981$68.39$3.20
Jun 20252,0212,0332,9692,36517$68.17$3.02
May 20252,5972,5844,6583,78223$62.17$3.12
Apr 20252,0902,0933,5392,87928$63.54$3.42
Mar 20252,2362,2393,8663,16320$68.24$4.12
Feb 20252,2152,2144,1163,25672$71.53$4.19
Jan 20252,8792,8645,0304,04061$75.74$4.13
Dec 20242,1342,1383,9543,22010$70.12$3.01
Nov 20242,4422,4595,2874,18928$69.95$2.12
Oct 20242,9272,9005,9824,76354$71.99$2.20
Sep 20241,9531,9613,5482,90221$70.24$2.28
Aug 20242,2962,3073,6903,02728$76.68$1.99
Jul 20242,9552,9404,8093,89222$81.80$2.07
Jun 20242,3332,3432,6522,09745$79.77$2.54
May 20242,7032,7083,3252,57765$80.02$2.12
Apr 20241,9651,9902,1641,74418$85.35$1.60
Mar 20243,1223,0955,0644,21355$81.28$1.49
Feb 20242,1082,0684,1893,49126$77.25$1.72
Jan 20240011352$74.15$3.18
Dec 20230371,3059136$71.90$2.52
Nov 20232,3332,3202,9881,86643$77.69$2.71
Oct 20232,0562,0732,5081,56449$85.64$2.98
Sep 20232,4542,4534,6003,48654$89.43$2.64
Aug 20232,7232,7265,7454,38661$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 LLCFieldEagleville (Eagle Ford-2)CountyKarnes County

Marathon Oil Ef LLC in Karnes County

All Marathon Oil Ef LLC leases →

Eagleville (Eagle Ford-2) field

All leases in this field →

Leases within 10 km

Drilling permits within 10 km