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Texas oil lease

Producing

GROSS-MCLEAN UNIT

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

6 wells

1,175bbl oil, last 12 months+18% vs prior year
Operator
Marathon Oil Ef LLC
County
Karnes County
Field
Eagleville (Eagle Ford-2)
RRC lease
02-10338

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Where it sits

This county

Karnes CountyKarnesAtascosaGoliadWilsonGonzalesDe WittBexarKarnes County
Karnes County
Gas, last 12 months
1,680 mcf
Oil in Jul 2026
55 bbl

Production by month

Oil output rose 18% over the last 12 months

  • Oil (bars)
  • Gas (line)
  • Last 12 months
Oil output rose 18% over the last 12 monthsMonthly oil production and gas for GROSS-MCLEAN UNIT, Aug 2023 to Jul 2026. Oil output rose 18% over the last 12 months. 1,175 bbl in the 12 months through Jul 2026, against 992 bbl in the 12 months before.Last 12 months: 1,175 bblbbl per monthmcf per month002502,0005004,0007506,0001,0008,0001,25010kOct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output rose 18% over the last 12 monthsMonthly oil production and gas for GROSS-MCLEAN UNIT, Aug 2023 to Jul 2026. Oil output rose 18% over the last 12 months. 1,175 bbl in the 12 months through Jul 2026, against 992 bbl in the 12 months before.Last 12 monthsbbl per monthmcf per month002502,0005004,0007506,0001,0008,0001,25010kJan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

Where the gas went

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

Flaring peaked at 4.1% of the gas in Feb 2026.

  • Processing plant (3)
  • Lease fuel (1)
  • Flared (4)
Since Mar 2024 the lease's gas goes to a processing plant instead of lease fuelShare of GROSS-MCLEAN UNIT gas by disposition code each month, Aug 2023 to Jul 2026. Since Mar 2024 the lease's gas goes to a processing plant instead of lease fuel. Flaring peaked at 4.1% of the gas in Feb 2026.Share of the lease’s gas by disposition code, per month0%50%100%Mar 2024: fuel to plantFlared 4.1%Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Since Mar 2024 the lease's gas goes to a processing plant instead of lease fuelShare of GROSS-MCLEAN UNIT gas by disposition code each month, Aug 2023 to Jul 2026. Since Mar 2024 the lease's gas goes to a processing plant instead of lease fuel. Flaring peaked at 4.1% of the gas in Feb 2026.Share of gas by disposition code0%50%100%Mar 24: fuel to plantFlared 4.1%Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

  • Processing plant (3)

    83% · 1,927 mcf

  • Lease fuel (1)

    16% · 373 mcf

  • Flared (4)

    0.9% · 22 mcf

0.9% of the gas flared in the last 12 months. One month above 3%.

6 wells on this lease

Wells on GROSS-MCLEAN UNIT
API numberWell no.Status
42-255-326691HActive
42-255-327052HShut-in
42-255-329683HShut-in
42-255-360274HActive
42-255-360285HActive
42-255-36507502HActive

SourceTexas Railroad Commission Wellbore Query.

Buyers and gatherers

Companies named on the Form P-4, by product
CompanyProductRoleShare%FromUntil
Statewide Crude Inc.OilGathers50Jul 1, 2022–
Plains Pipeline L.p.OilGathers25Jul 1, 2022–
Reynolds Energy Transport LLCOilGathers25Jul 1, 2022–
Marathon Oil Ef LLCCasinghead gasBuys100Nov 11, 2012–
Marathon Oil Ef LLCCasinghead gasGathers100Nov 11, 2012–
Gulfmark Energy, Inc.OilGathers10Nov 11, 2012Jul 1, 2022
Statewide Crude Inc.OilGathers90Nov 11, 2012Jul 1, 2022

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

Who buys my oilOil price check

274.94 acres on the newest permit

  • Good to know

    The wells on this lease state different acreage

    The permits state between 274.94 and 275 acres. Use the acres from your own division order for the well you are paid on.

  • 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 Gross-McLean Unit
API numberWell no.Acreson the permit
42-255-36507502H274.94
42-255-360274H274.94
42-255-360285H274.94
42-255-329683H274.94
42-255-327052H275
42-255-326691H275

SourceRailroad Commission drilling permits, Sep 26, 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 GROSS-MCLEAN UNIT
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 202655552091781$80.46$2.89
Jun 202636412712301$84.81$3.15
May 20262062032101821$102.13$2.94
Apr 20261471503673231$100.32$2.77
Mar 20262472462221932$91.38$3.04
Feb 202611611131926313$64.51$3.62
Jan 202600000$60.04$7.72
Dec 2025010000$57.97$4.26
Nov 202536835882730$60.06$3.79
Oct 202500000$60.89$3.19
Sep 202500000$63.96$2.97
Aug 202500000$64.86$2.91
Jul 202502000$68.39$3.20
Jun 20253436430$68.17$3.02
May 20258790117891$62.17$3.12
Apr 202512912850380$63.54$3.42
Mar 20251361342081561$68.24$4.12
Feb 202571692631991$71.53$4.19
Jan 20253942860$75.74$4.13
Dec 202410210220160$70.12$3.01
Nov 20241181195744513$69.95$2.12
Oct 20241291266264874$71.99$2.20
Sep 202479792041631$70.24$2.28
Aug 202468691331011$76.68$1.99
Jul 2024919099721$81.80$2.07
Jun 20241001002471942$79.77$2.54
May 2024991181531181$80.02$2.12
Apr 20247447517645928$85.35$1.60
Mar 20241,0831,0798146473$81.28$1.49
Feb 202479177647937$77.25$1.72
Jan 20243183273481755$74.15$3.18
Dec 20239059081,41854517$71.90$2.52
Nov 20237597573,4762,46925$77.69$2.71
Oct 20237867846,0184,77430$85.64$2.98
Sep 20239179152,4191,27923$89.43$2.64
Aug 20238108062,4171,49221$81.39$2.58

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)CountyKarnes County

Marathon Oil Ef LLC in Karnes County

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