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Texas oil lease

Producing

GUAJILLO UNIT 12 SOUTH

Guajillo Unit 12 South is an oil lease in Live Oak County, Texas, operated by Marathon Oil Ef LLC in the Eagleville (Eagle Ford-2) field.

4 wells

10,243bbl oil, last 12 months+16% vs prior year
Operator
Marathon Oil Ef LLC
County
Live Oak County
Field
Eagleville (Eagle Ford-2)
RRC lease
02-11258

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Where it sits

This county

Live Oak CountyLive OakAtascosaGoliadMcMullenKarnesSan PatricioBeeLive Oak County
Live Oak County
Gas, last 12 months
20,370 mcf
Oil in Jul 2026
485 bbl

Production by month

Oil output rose 16% over the last 12 months

  • Oil (bars)
  • Gas (line)
  • Last 12 months
Oil output rose 16% over the last 12 monthsMonthly oil production and gas for GUAJILLO UNIT 12 SOUTH, Aug 2023 to Jul 2026. Oil output rose 16% over the last 12 months. 10,243 bbl in the 12 months through Jul 2026, against 8,797 bbl in the 12 months before.Last 12 months: 10,243 bblbbl per monthmcf per month005001,0001,0002,0001,5003,0002,0004,0002,5005,000Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output rose 16% over the last 12 monthsMonthly oil production and gas for GUAJILLO UNIT 12 SOUTH, Aug 2023 to Jul 2026. Oil output rose 16% over the last 12 months. 10,243 bbl in the 12 months through Jul 2026, against 8,797 bbl in the 12 months before.Last 12 monthsbbl per monthmcf per month005001,0001,0002,0001,5003,0002,0004,0002,5005,000Jan 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

Flaring peaked at 4.7% of the gas in Sep 2023.

  • 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 GUAJILLO UNIT 12 SOUTH 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. Flaring peaked at 4.7% of the gas in Sep 2023.Share of the lease’s gas by disposition code, per month0%50%100%Feb 2024: fuel to plantFlared 4.7%Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Since Feb 2024 the lease's gas goes to a processing plant instead of lease fuelShare of GUAJILLO UNIT 12 SOUTH 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. Flaring peaked at 4.7% of the gas in Sep 2023.Share of gas by disposition code0%50%100%Feb 24: fuel to plantFlared 4.7%Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

  • Processing plant (3)

    69% · 14,118 mcf

  • Lease fuel (1)

    29% · 5,929 mcf

  • Flared (4)

    1.6% · 323 mcf

1.6% of the gas flared in the last 12 months. 6 months above 3%.

4 wells on this lease

Wells on GUAJILLO UNIT 12 SOUTH
API numberWell no.Status
42-297-358011HActive
42-297-358023HActive
42-297-358032HActive
42-297-358044HActive

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 gasBuys100Jun 7, 2016–
Marathon Oil Ef LLCCasinghead gasGathers100Jun 7, 2016–
Gulfmark Energy, Inc.OilGathers15Jun 7, 2016Jul 1, 2022
Harvest Midstream CompanyOilGathers5Sep 1, 2018Jul 1, 2022
Marathon Oil Ef LLCOilGathers1Jun 7, 2016Jul 1, 2022
Shell Trading (Us) CompanyOilGathers3Jun 7, 2016Jul 1, 2022
Statewide Crude Inc.OilGathers5Jun 7, 2016Jul 1, 2022
Valero Marketing and Supply Co.OilGathers71Jun 7, 2016Jul 1, 2022

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

Who buys my oilOil price check

163.88 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 12 South
API numberWell no.Acreson the permit
42-297-358023H163.88
42-297-358032H163.88
42-297-358044H163.88
42-297-358011H163.88

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 12 SOUTH
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 20264855041,7221,12721$80.46$2.89
Jun 20261,0381,0382,6691,78827$84.81$3.15
May 20261,0961,0973,4132,38157$102.13$2.94
Apr 20261,1931,1933,2442,31828$100.32$2.77
Mar 202683081981755717$91.38$3.04
Feb 20266506461,18984514$64.51$3.62
Jan 20261,0059971,9031,33613$60.04$7.72
Dec 20257097079947187$57.97$4.26
Nov 20256296301,11577740$60.06$3.79
Oct 20257157191,17286117$60.89$3.19
Sep 202589088898968533$63.96$2.97
Aug 20251,0039921,14372549$64.86$2.91
Jul 202508000$68.39$3.20
Jun 20257767771,55994343$68.17$3.02
May 202580781177947520$62.17$3.12
Apr 20257867811,18374424$63.54$3.42
Mar 20258438422,1511,39744$68.24$4.12
Feb 202572372789058011$71.53$4.19
Jan 20259899831,7231,11455$75.74$4.13
Dec 20241,2811,2792,4121,62646$70.12$3.01
Nov 20246786781,36996224$69.95$2.12
Oct 20241,0371,0351,00574116$71.99$2.20
Sep 202425425767651611$70.24$2.28
Aug 20246236241,07683211$76.68$1.99
Jul 20241,1911,1932,1231,67418$81.80$2.07
Jun 20241,4191,4252,2351,65437$79.77$2.54
May 20241,2001,1972,8031,55072$80.02$2.12
Apr 20249749772,9121,469102$85.35$1.60
Mar 20241,3681,3653,2171,86536$81.28$1.49
Feb 20241,3231,3262,8881,48059$77.25$1.72
Jan 20241,4241,4263,0691,45787$74.15$3.18
Dec 20231,3901,3903,5892,04678$71.90$2.52
Nov 20231,5861,5824,2282,62686$77.69$2.71
Oct 20231,6271,6274,9853,239124$85.64$2.98
Sep 20231,5171,5174,4962,748212$89.43$2.64
Aug 20231,5821,5804,1892,62678$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)CountyLive Oak County

Marathon Oil Ef LLC in Live Oak County

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Eagleville (Eagle Ford-2) field

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