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Texas oil lease

Producing

GUAJILLO WEST

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

9 wells

31,987bbl oil, last 12 months−55% vs prior year
Operator
Marathon Oil Ef LLC
County
Atascosa County
Field
Eagleville (Eagle Ford-1)
RRC lease
01-19097

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Where it sits

This county

Atascosa CountyAtascosaWilsonMedinaKarnesFrioBexarAtascosa County
Atascosa County
Gas, last 12 months
51,818 mcf
Oil in Jul 2026
2,413 bbl

Production by month

Oil output fell 55% over the last 12 months

  • Oil (bars)
  • Gas (line)
  • Last 12 months
Oil output fell 55% over the last 12 monthsMonthly oil production and gas for GUAJILLO WEST, Aug 2023 to Jul 2026. Oil output fell 55% over the last 12 months. 31,987 bbl in the 12 months through Jul 2026, against 70,946 bbl in the 12 months before.Last 12 months: 31,987 bblbbl per monthmcf per month002,0005,0004,00010k6,00015k8,00020kOct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output fell 55% over the last 12 monthsMonthly oil production and gas for GUAJILLO WEST, Aug 2023 to Jul 2026. Oil output fell 55% over the last 12 months. 31,987 bbl in the 12 months through Jul 2026, against 70,946 bbl in the 12 months before.Last 12 monthsbbl per monthmcf per month002,0005,0004,00010k6,00015k8,00020kJan 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 5.4% of the gas in Sep 2023.

  • Processing plant (3)
  • Lease fuel (1)
  • Flared (4)
69% of the gas went to a processing plant in the last 12 monthsShare of GUAJILLO WEST 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 5.4% of the gas in Sep 2023.Share of the lease’s gas by disposition code, per month0%50%100%Flared 5.4%Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
69% of the gas went to a processing plant in the last 12 monthsShare of GUAJILLO WEST 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 5.4% of the gas in Sep 2023.Share of gas by disposition code0%50%100%Flared 5.4%Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

  • Processing plant (3)

    69% · 35,617 mcf

  • Lease fuel (1)

    29% · 14,987 mcf

  • Flared (4)

    2.3% · 1,214 mcf

2.3% of the gas flared in the last 12 months. 7 months above 3%.

9 wells on this lease

Wells on GUAJILLO WEST
API numberWell no.Status
42-013-3546258HActive
42-013-3546338HActive
42-013-3546436HActive
42-013-3546534HActive
42-013-3546656HActive
42-297-3588315HActive
42-297-3588417HActive
42-297-3588560HActive
42-297-3588619HActive

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 gasBuys100Jul 27, 2017–
Marathon Oil Ef LLCCasinghead gasGathers100Jul 27, 2017–
Gulfmark Energy, Inc.OilGathers15Jul 27, 2017Jul 1, 2022
Harvest Midstream CompanyOilGathers5Sep 1, 2018Jul 1, 2022
Marathon Oil Ef LLCOilGathers1Jul 27, 2017Jul 1, 2022
Shell Trading (Us) CompanyOilGathers3Jul 27, 2017Jul 1, 2022
Statewide Crude Inc.OilGathers5Jul 27, 2017Jul 1, 2022
Valero Marketing and Supply Co.OilGathers71Jul 27, 2017Jul 1, 2022

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

Who buys my oilOil price check

835.77 acres on the newest permit

9 wells are listed on this lease

Permits for Guajillo West
API numberWell no.Acreson the permit
42-297-3588315H835.77
42-297-3588417H835.77
42-297-3588560H835.77
42-297-3588619H835.77
42-013-3546656H835.77
42-013-3546258H835.77
42-013-3546338H835.77
42-013-3546436H835.77
42-013-3546534H835.77

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 GUAJILLO WEST
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 20262,4132,4102,9171,91035$80.46$2.89
Jun 20261,9891,9892,9211,95630$84.81$3.15
May 20262,0902,1162,2611,57738$102.13$2.94
Apr 20263,3163,2904,9203,51643$100.32$2.77
Mar 20261,5411,5352,5141,71551$91.38$3.04
Feb 20261,6161,6082,4491,74129$64.51$3.62
Jan 20262,5792,5642,4511,72116$60.04$7.72
Dec 20252,2952,2912,7611,99320$57.97$4.26
Nov 20252,3302,3454,9283,433176$60.06$3.79
Oct 20253,2893,2995,8644,30983$60.89$3.19
Sep 20253,6363,6387,4415,155251$63.96$2.97
Aug 20254,8934,92110,3916,591442$64.86$2.91
Jul 20256,7046,68312,0027,498224$68.39$3.20
Jun 20255,8505,85410,9716,638300$68.17$3.02
May 20255,8525,88112,2007,440311$62.17$3.12
Apr 20255,7735,7238,9785,647182$63.54$3.42
Mar 20254,8564,8569,1785,961187$68.24$4.12
Feb 20254,7974,81810,4286,797130$71.53$4.19
Jan 20256,0436,00112,6108,155401$75.74$4.13
Dec 20245,9475,94910,6167,157203$70.12$3.01
Nov 20246,5416,53211,7068,226205$69.95$2.12
Oct 20246,8856,89111,0968,180175$71.99$2.20
Sep 20245,4535,4666,9665,321112$70.24$2.28
Aug 20246,2456,2358,6156,66488$76.68$1.99
Jul 20245,6165,6198,3336,57172$81.80$2.07
Jun 20245,8905,9058,8886,578147$79.77$2.54
May 20244,0314,0459,4095,204241$80.02$2.12
Apr 20245,6305,63113,1966,657463$85.35$1.60
Mar 20246,1126,09613,2277,671147$81.28$1.49
Feb 20245,8525,86413,3278,171215$77.25$1.72
Jan 20245,8945,91011,2055,588304$74.15$3.18
Dec 20236,4616,45314,5708,319315$71.90$2.52
Nov 20236,5366,51413,3057,110333$77.69$2.71
Oct 20235,8945,90013,2247,265425$85.64$2.98
Sep 20236,3496,35614,6168,135786$89.43$2.64
Aug 20237,4467,44215,1298,725321$81.39$2.58

Flared above 3%

SourceTexas Railroad Commission Production Data Query, through Jul 2026. Prices: EIA, through Aug 2026. Updated Sep 28, 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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