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Texas oil lease

Producing

GUAJILLO UNIT 15 SOUTH

Guajillo Unit 15 South is an oil lease in Atascosa County, Texas, operated by Marathon Oil Ef LLC in the Eagleville (Eagle Ford-2) field.

5 wells

72,845bbl oil, last 12 months−20% vs prior year
Operator
Marathon Oil Ef LLC
County
Atascosa County
Field
Eagleville (Eagle Ford-2)
RRC lease
02-12265

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Where it sits

This county

Atascosa CountyAtascosaWilsonMedinaKarnesFrioBexarAtascosa County
Atascosa County
Gas, last 12 months
89,103 mcf
Oil in Jul 2026
6,054 bbl

Production by month

Oil output fell 20% over the last 12 months

  • Oil (bars)
  • Gas (line)
  • Last 12 months
Oil output fell 20% over the last 12 monthsMonthly oil production and gas for GUAJILLO UNIT 15 SOUTH, Aug 2023 to Jul 2026. Oil output fell 20% over the last 12 months. 72,845 bbl in the 12 months through Jul 2026, against 91,187 bbl in the 12 months before.Last 12 months: 72,845 bblbbl per monthmcf per month005,00010k10k20k15k30k20k40kOct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output fell 20% over the last 12 monthsMonthly oil production and gas for GUAJILLO UNIT 15 SOUTH, Aug 2023 to Jul 2026. Oil output fell 20% over the last 12 months. 72,845 bbl in the 12 months through Jul 2026, against 91,187 bbl in the 12 months before.Last 12 monthsbbl per monthmcf per month005,00010k10k20k15k30k20k40kJan 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 4.2% 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 UNIT 15 SOUTH 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 4.2% 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
69% of the gas went to a processing plant in the last 12 monthsShare of GUAJILLO UNIT 15 SOUTH 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 4.2% 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)

    69% · 61,739 mcf

  • Lease fuel (1)

    29% · 26,025 mcf

  • Flared (4)

    1.5% · 1,339 mcf

1.5% of the gas flared in the last 12 months. 5 months above 3%.

5 wells on this lease

Wells on GUAJILLO UNIT 15 SOUTH
API numberWell no.Status
42-013-357681HActive
42-013-357692HActive
42-013-357703HActive
42-013-357714HActive
42-013-357725HActive

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 21, 2022–
Marathon Oil Ef LLCCasinghead gasGathers100Jan 21, 2022–
Enterprise Crude Oil LLCOilGathers1Jan 21, 2022Jul 1, 2022
Gulfmark Energy, Inc.OilGathers1Jan 21, 2022Jul 1, 2022
Harvest Midstream CompanyOilGathers97Jan 21, 2022Jul 1, 2022
Trafigura Trading LLCOilGathers1Jan 21, 2022Jul 1, 2022

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

Who buys my oilOil price check

292.70 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 15 South
API numberWell no.Acreson the permit
42-013-357681H292.70
42-013-357725H292.70
42-013-357692H292.70
42-013-357703H292.70
42-013-357714H292.70

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 15 SOUTH
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 20266,0546,06610,0566,585121$80.46$2.89
Jun 20265,6535,66813,2318,863134$84.81$3.15
May 20266,3946,39718,27812,752305$102.13$2.94
Apr 20267,0917,16110,7617,69093$100.32$2.77
Mar 20266,6386,5537,1724,893146$91.38$3.04
Feb 20265,1385,0603,4972,48542$64.51$3.62
Jan 20265,3665,3644,5303,18130$60.04$7.72
Dec 20256,9516,9225,9434,29142$57.97$4.26
Nov 20255,5205,5505,1923,618185$60.06$3.79
Oct 20257,4657,4466,7064,92895$60.89$3.19
Sep 20255,3615,3421,40797547$63.96$2.97
Aug 20255,2145,2362,3301,47899$64.86$2.91
Jul 20256,5336,5193,9542,47074$68.39$3.20
Jun 20256,2886,2914,7302,862129$68.17$3.02
May 20256,2386,2216,9354,229177$62.17$3.12
Apr 20253,1983,1923,5472,23172$63.54$3.42
Mar 20255,1105,1297,0634,587144$68.24$4.12
Feb 20257,0557,0707,5454,91894$71.53$4.19
Jan 20257,4667,4159,5566,179304$75.74$4.13
Dec 20247,6017,60810,9347,370209$70.12$3.01
Nov 20249,2709,25818,30712,862320$69.95$2.12
Oct 202410,37610,39723,60817,400371$71.99$2.20
Sep 202410,74810,76823,72418,118381$70.24$2.28
Aug 202411,30411,29525,50519,723261$76.68$1.99
Jul 202412,29212,28919,83415,638170$81.80$2.07
Jun 202410,78710,85915,16411,220251$79.77$2.54
May 202411,55911,54610,9866,076282$80.02$2.12
Apr 202411,03311,01010,8425,470380$85.35$1.60
Mar 20249,2829,2838,1854,74791$81.28$1.49
Feb 202412,42212,47612,7278,964157$77.25$1.72
Jan 202415,52215,52412,2808,393210$74.15$3.18
Dec 202313,34713,34613,9049,999197$71.90$2.52
Nov 202315,19915,16023,46619,140233$77.69$2.71
Oct 202315,55715,56215,88011,433317$85.64$2.98
Sep 202315,27015,28321,27016,799542$89.43$2.64
Aug 202317,29617,30822,62918,410212$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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