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Texas oil lease

Producing

GUAJILLO UNIT 9 SOUTH

Guajillo Unit 9 South is an oil lease in Atascosa County, Texas, operated by Marathon Oil Ef LLC in the Eagleville (Eagle Ford-2) field.

4 wells

10,545bbl oil, last 12 months−28% vs prior year
Operator
Marathon Oil Ef LLC
County
Atascosa County
Field
Eagleville (Eagle Ford-2)
RRC lease
02-11231

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Where it sits

This county

Atascosa CountyAtascosaWilsonMedinaKarnesFrioBexarAtascosa County
Atascosa County
Gas, last 12 months
8,257 mcf
Oil in Jul 2026
1,092 bbl

Production by month

Oil output fell 28% over the last 12 months

  • Oil (bars)
  • Gas (line)
  • Last 12 months
Oil output fell 28% over the last 12 monthsMonthly oil production and gas for GUAJILLO UNIT 9 SOUTH, Aug 2023 to Jul 2026. Oil output fell 28% over the last 12 months. 10,545 bbl in the 12 months through Jul 2026, against 14,652 bbl in the 12 months before.Last 12 months: 10,545 bblbbl per monthmcf per month005005001,0001,0001,5001,5002,0002,0002,5002,500Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output fell 28% over the last 12 monthsMonthly oil production and gas for GUAJILLO UNIT 9 SOUTH, Aug 2023 to Jul 2026. Oil output fell 28% over the last 12 months. 10,545 bbl in the 12 months through Jul 2026, against 14,652 bbl in the 12 months before.Last 12 monthsbbl per monthmcf per month005005001,0001,0001,5001,5002,0002,0002,5002,500Jan 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 12.1% of the gas in Sep 2023.

  • 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 GUAJILLO UNIT 9 SOUTH 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 12.1% of the gas in Sep 2023.Share of the lease’s gas by disposition code, per month0%50%100%Mar 2024: fuel to plantFlared 12.1%Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Since Mar 2024 the lease's gas goes to a processing plant instead of lease fuelShare of GUAJILLO UNIT 9 SOUTH 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 12.1% of the gas in Sep 2023.Share of gas by disposition code0%50%100%Mar 24: fuel to plantFlared 12.1%Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

  • Processing plant (3)

    69% · 6,318 mcf

  • Lease fuel (1)

    30% · 2,717 mcf

  • Flared (4)

    1.4% · 130 mcf

1.4% of the gas flared in the last 12 months. 11 months above 3%.

4 wells on this lease

Wells on GUAJILLO UNIT 9 SOUTH
API numberWell no.Status
42-013-353341HActive
42-013-353352HActive
42-013-353363HActive
42-013-353374HActive

SourceTexas Railroad Commission Wellbore Query.

Buyers and gatherers

Companies named on the Form P-4, by product
CompanyProductRoleShare%FromUntil
Harvest Midstream CompanyOilGathers20Jul 1, 2022–
Reynolds Energy Transport LLCOilGathers20Jul 1, 2022–
Shell Trading (Us) CompanyOilGathers20Jul 1, 2022–
Statewide Crude Inc.OilGathers20Jul 1, 2022–
Valero Marketing and Supply Co.OilGathers20Jul 1, 2022–
Marathon Oil Ef LLCCasinghead gasBuys100Dec 13, 2015–
Marathon Oil Ef LLCCasinghead gasGathers100Dec 13, 2015–
Gulfmark Energy, Inc.OilGathers15Dec 13, 2015Jul 1, 2022
Harvest Midstream CompanyOilGathers5Sep 1, 2018Jul 1, 2022
Marathon Oil Ef LLCOilGathers1Dec 13, 2015Jul 1, 2022
Shell Trading (Us) CompanyOilGathers3Dec 13, 2015Jul 1, 2022
Statewide Crude Inc.OilGathers5Dec 13, 2015Jul 1, 2022
Valero Marketing and Supply Co.OilGathers71Dec 13, 2015Jul 1, 2022

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

Who buys my oilOil price check

244.32 acres on the newest permit

  • 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 Guajillo Unit 9 South
API numberWell no.Acreson the permit
42-013-353341H244.32
42-013-353352H244.32
42-013-353363H244.32
42-013-353374H244.32

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 GUAJILLO UNIT 9 SOUTH
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 20261,0921,1031,26682915$80.46$2.89
Jun 20261,3091,2951,32488713$84.81$3.15
May 202688689871249712$102.13$2.94
Apr 20261,4281,4231,0757689$100.32$2.77
Mar 20266906853832618$91.38$3.04
Feb 20268188044983546$64.51$3.62
Jan 20267727751571101$60.04$7.72
Dec 20251,2401,2277965746$57.97$4.26
Nov 202529531543030015$60.06$3.79
Oct 20251,8401,8161,4481,06421$60.89$3.19
Sep 202502000$63.96$2.97
Aug 20251751851681077$64.86$2.91
Jul 202594794690856717$68.39$3.20
Jun 20251,0471,0461,03962928$68.17$3.02
May 20258969051,26977432$62.17$3.12
Apr 20251,1721,1641,00863420$63.54$3.42
Mar 20251,2241,22755436011$68.24$4.12
Feb 20251,4731,4751,51999019$71.53$4.19
Jan 20251,4711,4601,16475337$75.74$4.13
Dec 20241,2801,27967545513$70.12$3.01
Nov 20241,1211,12156940010$69.95$2.12
Oct 20241,5191,5211,3821,01922$71.99$2.20
Sep 20241,4691,46983764013$70.24$2.28
Aug 20241,0331,0329067019$76.68$1.99
Jul 20241,1331,1339847768$81.80$2.07
Jun 20241,0751,0831,16286019$79.77$2.54
May 20241,2071,2061,20466631$80.02$2.12
Apr 20241,2121,21345222816$85.35$1.60
Mar 20241,3581,3554412565$81.28$1.49
Feb 20241,4091,4131,527064$77.25$1.72
Jan 20241,5501,5521,835099$74.15$3.18
Dec 20231,4761,4741,432072$71.90$2.52
Nov 20231,4971,4931,538083$77.69$2.71
Oct 20231,5011,5021,8350131$85.64$2.98
Sep 20231,4411,4412,0730251$89.43$2.64
Aug 20231,5371,5352,10917897$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)CountyAtascosa County

Marathon Oil Ef LLC in Atascosa County

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Eagleville (Eagle Ford-2) field

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