Skip to content
Royalty Clerk

Texas oil lease

Shut in

GUAJILLO EAST AC

Guajillo East Ac is an oil lease in Atascosa County, Texas, operated by Marathon Oil Ef LLC in the Sugarkane (Austin Chalk) field.

1 well

3,287bbl oil, last 12 months−78% vs prior year
Operator
Marathon Oil Ef LLC
County
Atascosa County
Field
Sugarkane (Austin Chalk)
RRC lease
02-11299

Is your check right?

Check my statement

Where it sits

This county

Atascosa CountyAtascosaWilsonMedinaKarnesFrioBexarAtascosa County
Atascosa County
Gas, last 12 months
3,993 mcf
Oil in Jul 2026
0 bbl

Checks stopped on this lease?

  • Sales

    No sales reported for the last 4 months of state data (through Jul 2026).

SourceRailroad Commission production, P-5 and P-4 records, data through Jul 2026.

See why checks stop on this lease

Production by month

Oil output fell 78% over the last 12 months

  • Oil (bars)
  • Gas (line)
  • Last 12 months
Oil output fell 78% over the last 12 monthsMonthly oil production and gas for GUAJILLO EAST AC, Aug 2023 to Jul 2026. Oil output fell 78% over the last 12 months. 3,287 bbl in the 12 months through Jul 2026, against 14,747 bbl in the 12 months before.Last 12 months: 3,287 bblbbl per monthmcf per month001,0002,0002,0004,0003,0006,0004,0008,000Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output fell 78% over the last 12 monthsMonthly oil production and gas for GUAJILLO EAST AC, Aug 2023 to Jul 2026. Oil output fell 78% over the last 12 months. 3,287 bbl in the 12 months through Jul 2026, against 14,747 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

64% of the gas went to a processing plant in the last 12 months

Flaring peaked at 4.2% of the gas in Aug 2025.

  • Processing plant (3)
  • Lease fuel (1)
  • Flared (4)
64% of the gas went to a processing plant in the last 12 monthsShare of GUAJILLO EAST AC gas by disposition code each month, Aug 2023 to Jul 2026. 64% of the gas went to a processing plant in the last 12 months. Flaring peaked at 4.2% of the gas in Aug 2025.Share of the lease’s gas by disposition code, per month0%50%100%Flared 4.2%Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
64% of the gas went to a processing plant in the last 12 monthsShare of GUAJILLO EAST AC gas by disposition code each month, Aug 2023 to Jul 2026. 64% of the gas went to a processing plant in the last 12 months. Flaring peaked at 4.2% of the gas in Aug 2025.Share of gas by disposition code0%50%100%Flared 4.2%Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

  • Processing plant (3)

    64% · 8,854 mcf

  • Lease fuel (1)

    33% · 4,610 mcf

  • Flared (4)

    2.5% · 346 mcf

2.5% of the gas flared in the last 12 months. 4 months above 3%.

1 well on this lease

Wells on GUAJILLO EAST AC
API numberWell no.Status
42-013-350162HActive

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 gasBuys100Jan 10, 2015–
Marathon Oil Ef LLCCasinghead gasGathers100Jan 10, 2015–
Enterprise Crude Oil LLCOilGathers1Sep 1, 2018Jul 1, 2022
Gulfmark Energy, Inc.OilGathers1Sep 1, 2018Jul 1, 2022
Harvest Midstream CompanyOilGathers97Sep 1, 2018Jul 1, 2022
Trafigura Trading LLCOilGathers1Sep 1, 2018Jul 1, 2022

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

Who buys my oilOil price check

6,865.35 acres on the newest permit

Check your decimal on this lease
Permits for Guajillo East Ac
API numberWell no.Acreson the permit
42-013-350162H6,865.35

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 EAST AC
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 202600000$80.46$2.89
Jun 202600000$84.81$3.15
May 202600000$102.13$2.94
Apr 202600000$100.32$2.77
Mar 202607000$91.38$3.04
Feb 202619619832230$64.51$3.62
Jan 202649248881571$60.04$7.72
Dec 202535535554390$57.97$4.26
Nov 202543744044831216$60.06$3.79
Oct 202559960270551810$60.89$3.19
Sep 20257297231,08975437$63.96$2.97
Aug 20254794861,5841,00567$64.86$2.91
Jul 20259569492,1811,36241$68.39$3.20
Jun 20254995031,39184238$68.17$3.02
May 20257747821,7971,09646$62.17$3.12
Apr 20251,0261,0192,0951,31842$63.54$3.42
Mar 20251,1351,1332,3531,52848$68.24$4.12
Feb 20259079081,7341,13022$71.53$4.19
Jan 20258308262,0311,31365$75.74$4.13
Dec 20241,1341,1343,1412,11760$70.12$3.01
Nov 20241,1741,1733,0262,12653$69.95$2.12
Oct 20241,5321,5354,0933,01764$71.99$2.20
Sep 20241,6261,6373,9142,98963$70.24$2.28
Aug 20243,1543,1507,0385,44372$76.68$1.99
Jul 20242,9642,9506,2054,89253$81.80$2.07
Jun 202400000$79.77$2.54
May 202400000$80.02$2.12
Apr 202400000$85.35$1.60
Mar 202400000$81.28$1.49
Feb 202400000$77.25$1.72
Jan 202400000$74.15$3.18
Dec 202300000$71.90$2.52
Nov 202300000$77.69$2.71
Oct 202300000$85.64$2.98
Sep 202300000$89.43$2.64
Aug 202300000$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.

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 (Austin Chalk)CountyAtascosa County

Marathon Oil Ef LLC in Atascosa County

All Marathon Oil Ef LLC leases →

Sugarkane (Austin Chalk) field

All leases in this field →

Leases within 10 km

Drilling permits within 10 km