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Texas oil lease

Producing

GUAJILLO EAST

Guajillo East is an oil lease in Atascosa County, Texas, operated by Marathon Oil Ef LLC in the Eagleville (Eagle Ford-1) field.

51 wells

171,228bbl oil, last 12 months−46% vs prior year
Operator
Marathon Oil Ef LLC
County
Atascosa County
Field
Eagleville (Eagle Ford-1)
RRC lease
01-17741

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Where it sits

This county

Atascosa CountyAtascosaWilsonMedinaKarnesFrioBexarAtascosa County
Atascosa County
Gas, last 12 months
203,505 mcf
Oil in Jul 2026
18,371 bbl

Production by month

Oil output fell 46% over the last 12 months

  • Oil (bars)
  • Gas (line)
  • Last 12 months
Oil output fell 46% over the last 12 monthsMonthly oil production and gas for GUAJILLO EAST, Aug 2023 to Jul 2026. Oil output fell 46% over the last 12 months. 171,228 bbl in the 12 months through Jul 2026, against 314,601 bbl in the 12 months before.Last 12 months: 171,228 bblbbl per monthmcf per month0010k20k20k40k30k60k40k80kOct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output fell 46% over the last 12 monthsMonthly oil production and gas for GUAJILLO EAST, Aug 2023 to Jul 2026. Oil output fell 46% over the last 12 months. 171,228 bbl in the 12 months through Jul 2026, against 314,601 bbl in the 12 months before.Last 12 monthsbbl per monthmcf per month0010k20k20k40k30k60k40k80kJan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

Where the gas went

69% of the gas went to a processing plant in the last 12 months

Flaring peaked at 4.3% of the gas in Aug 2025.

  • Processing plant (3)
  • Lease fuel (1)
  • Flared (4)
69% of the gas went to a processing plant in the last 12 monthsShare of GUAJILLO EAST gas by disposition code each month, Aug 2023 to Jul 2026. 69% of the gas went to a processing plant in the last 12 months. Flaring peaked at 4.3% of the gas in Aug 2025.Share of the lease’s gas by disposition code, per month0%50%100%Flared 4.3%Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
69% of the gas went to a processing plant in the last 12 monthsShare of GUAJILLO EAST gas by disposition code each month, Aug 2023 to Jul 2026. 69% of the gas went to a processing plant in the last 12 months. Flaring peaked at 4.3% of the gas in Aug 2025.Share of gas by disposition code0%50%100%Flared 4.3%Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

  • Processing plant (3)

    69% · 140,920 mcf

  • Lease fuel (1)

    29% · 58,381 mcf

  • Flared (4)

    2.1% · 4,204 mcf

2.1% of the gas flared in the last 12 months. 6 months above 3%.

51 wells on this lease

Wells on GUAJILLO EAST
API numberWell no.Status
42-013-349021HActive
42-013-349033HActive
42-013-349045HActive
42-013-3492513IActive
42-013-3492615IShut-in
42-013-3492771HActive
42-013-3492817IShut-in
42-013-3492919HActive
42-013-3495077HActive
42-013-3495131HActive
42-013-3495233HActive
42-013-3495379HActive
42-013-349792HActive
42-013-349804HActive
42-013-349816HActive
42-013-3498262HActive
42-013-3498364IActive
42-013-3498816HActive
42-013-3498968HActive
42-013-3499021HActive
42-013-3499173HActive
42-013-3504423HActive
42-013-3504525HActive
42-013-3504675HActive
42-013-3504727HActive
42-013-3504829HActive
42-013-3504967HActive
42-013-350507HActive
42-013-350519HActive
42-013-3505211HActive
42-013-3505469HActive
42-013-3506272HActive
42-013-3506326HActive
42-013-3506428HActive
42-013-3506574HActive
42-013-352588IActive
42-013-3525966HActive
42-013-3526010HActive
42-013-3526112IActive
42-013-3526214HActive
42-013-3526518HActive
42-013-3526620HActive
42-013-3526770HShut-in
42-013-3526822HActive
42-013-3526924HActive
42-013-35305504HShut-in
42-013-3555035HActive
42-013-3555137HShut-in
42-013-3555239HShut-in
42-013-3555341HActive
42-013-3555481HShut-in

SourceTexas Railroad Commission Wellbore Query.

Buyers and gatherers

Companies named on the Form P-4, by product
CompanyProductRoleShare%FromUntil
Enterprise Crude Oil LLCOilGathers50Jul 1, 2022–
Reynolds Energy Transport LLCOilGathers25Jul 1, 2022–
Trafigura Trading LLCOilGathers25Jul 1, 2022–
Marathon Oil Ef LLCCasinghead gasBuys100Mar 11, 2014–
Marathon Oil Ef LLCCasinghead gasGathers100Mar 11, 2014–
Enterprise Crude Oil LLCOilGathers33Sep 1, 2018Jul 1, 2022
Gulfmark Energy, Inc.OilGathers34Sep 1, 2018Jul 1, 2022
Trafigura Trading LLCOilGathers33Sep 1, 2018Jul 1, 2022

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

Who buys my oilOil price check

2,510.78 acres on the newest permit

  • Good to know

    The wells on this lease state different acreage

    The permits state between 2,510.78 and 6,868.9 acres. Use the acres from your own division order for the well you are paid on.

  • Good to know

    61 wells are listed on this lease

    Each well can have its own unit. The decimal for one well does not have to equal the decimal for another.

  • 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 East
API numberWell no.Acreson the permit
42-013-3504967H2,510.78
42-013-350507H2,510.78
42-013-350519H2,510.78
42-013-3505211H2,510.78
42-013-3505469H2,510.78
42-013-3555341H2,510.78
42-013-3555035H2,510.78
42-013-3555137H2,510.78
42-013-3555239H2,510.78
42-013-3555481H2,510.78
42-013-35305504H6,704.75
42-013-35305504I6,704.75

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 GUAJILLO EAST
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 202618,37118,40413,9659,145168$80.46$2.89
Jun 202617,01916,82016,25110,886164$84.81$3.15
May 202610,94210,9369,6576,738161$102.13$2.94
Apr 202611,71811,54212,3918,855107$100.32$2.77
Mar 20263,5533,8393,0402,07462$91.38$3.04
Feb 202612,42112,24412,9329,191155$64.51$3.62
Jan 202613,68013,63217,57512,342116$60.04$7.72
Dec 202514,55614,56618,49413,354131$57.97$4.26
Nov 202517,30617,31523,09316,090823$60.06$3.79
Oct 202516,98517,03624,51218,013348$60.89$3.19
Sep 202518,55818,46925,75817,844869$63.96$2.97
Aug 202516,11916,22925,83716,3881,100$64.86$2.91
Jul 202523,57523,49537,13523,199694$68.39$3.20
Jun 202519,86819,92833,81720,462924$68.17$3.02
May 202524,15324,27739,72624,2251,014$62.17$3.12
Apr 202523,97123,77238,98124,521789$63.54$3.42
Mar 202521,42721,44428,81218,711589$68.24$4.12
Feb 202522,98923,04434,05722,193426$71.53$4.19
Jan 202524,77124,61641,89327,0851,333$75.74$4.13
Dec 202428,53328,54052,28835,240998$70.12$3.01
Nov 202430,45730,41852,60736,959920$69.95$2.12
Oct 202433,30233,34253,41639,369840$71.99$2.20
Sep 202428,51728,58747,29236,116759$70.24$2.28
Aug 202433,03832,96555,60643,000569$76.68$1.99
Jul 202425,74025,72543,38434,204372$81.80$2.07
Jun 202420,95021,10243,05631,855713$79.77$2.54
May 202423,48023,48346,08525,4821,181$80.02$2.12
Apr 202425,23825,26047,39623,9051,662$85.35$1.60
Mar 202429,16129,06553,38730,952593$81.28$1.49
Feb 202425,18625,20430,01320,676389$77.25$1.72
Jan 202421,81121,86329,13718,301586$74.15$3.18
Dec 202323,13523,09134,26323,822526$71.90$2.52
Nov 202322,03821,99135,35125,340539$77.69$2.71
Oct 202323,79023,79337,32826,296786$85.64$2.98
Sep 202322,68122,70033,94423,1761,305$89.43$2.64
Aug 202325,68125,65940,33930,249506$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-1)CountyAtascosa County

Marathon Oil Ef LLC in Atascosa County

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Eagleville (Eagle Ford-1) field

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