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Producing

GUAJILLO UNIT 14 SOUTH

Guajillo Unit 14 South is an oil lease in Atascosa County, Texas, operated by Marathon Oil Ef LLC in the Eagleville (Eagle Ford-1) field.

4 wells

31,277bbl oil, last 12 months−33% vs prior year
Operator
Marathon Oil Ef LLC
County
Atascosa County
Field
Eagleville (Eagle Ford-1)
RRC lease
01-20461

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Where it sits

This county

Atascosa CountyAtascosaWilsonMedinaKarnesFrioBexarAtascosa County
Atascosa County
Gas, last 12 months
45,388 mcf
Oil in Jul 2026
3,559 bbl

Production by month

Oil output fell 33% over the last 12 months

  • Oil (bars)
  • Gas (line)
  • Last 12 months
Oil output fell 33% over the last 12 monthsMonthly oil production and gas for GUAJILLO UNIT 14 SOUTH, Aug 2023 to Jul 2026. Oil output fell 33% over the last 12 months. 31,277 bbl in the 12 months through Jul 2026, against 46,350 bbl in the 12 months before.Last 12 months: 31,277 bblbbl per monthmcf per month002,0002,5004,0005,0006,0007,5008,00010k10k12.5kOct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output fell 33% over the last 12 monthsMonthly oil production and gas for GUAJILLO UNIT 14 SOUTH, Aug 2023 to Jul 2026. Oil output fell 33% over the last 12 months. 31,277 bbl in the 12 months through Jul 2026, against 46,350 bbl in the 12 months before.Last 12 monthsbbl per monthmcf per month002,0002,5004,0005,0006,0007,5008,00010k10k12.5kJan 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 14 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 14 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% · 31,434 mcf

  • Lease fuel (1)

    29% · 13,177 mcf

  • Flared (4)

    1.7% · 777 mcf

1.7% of the gas flared in the last 12 months. 6 months above 3%.

4 wells on this lease

Wells on GUAJILLO UNIT 14 SOUTH
API numberWell no.Status
42-013-358451HActive
42-013-358462HActive
42-013-358473HActive
42-013-358484HActive

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 gasBuys100Jul 31, 2021–
Marathon Oil Ef LLCCasinghead gasGathers100Jul 31, 2021–
Enterprise Crude Oil LLCOilGathers1Jul 31, 2021Jul 1, 2022
Gulfmark Energy, Inc.OilGathers1Jul 31, 2021Jul 1, 2022
Harvest Midstream CompanyOilGathers97Jul 31, 2021Jul 1, 2022
Trafigura Trading LLCOilGathers1Jul 31, 2021Jul 1, 2022

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

Who buys my oilOil price check

196.29 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 14 South
API numberWell no.Acreson the permit
42-013-358462H196.29
42-013-358451H196.29
42-013-358473H196.29
42-013-358484H196.29

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 14 SOUTH
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 20263,5593,5603,5042,29542$80.46$2.89
Jun 20263,1373,0934,7943,21248$84.81$3.15
May 20261,7841,7844,2262,94970$102.13$2.94
Apr 20261,9171,9192,0521,46618$100.32$2.77
Mar 20261,3681,3603,3342,27468$91.38$3.04
Feb 20261,3281,3303,7292,65045$64.51$3.62
Jan 20262,6332,6282,8171,97819$60.04$7.72
Dec 20253,0883,0868,7696,33262$57.97$4.26
Nov 20253,3903,3922,9272,040104$60.06$3.79
Oct 20253,2893,2862,6131,92037$60.89$3.19
Sep 20252,7132,7082,0101,39268$63.96$2.97
Aug 20253,0713,0924,6132,926196$64.86$2.91
Jul 20254,5584,5497,7064,814144$68.39$3.20
Jun 20254,3874,3715,5023,329150$68.17$3.02
May 20252,7612,7862,4791,51263$62.17$3.12
Apr 20253,3603,3374,4192,78089$63.54$3.42
Mar 20253,5643,5654,3572,83089$68.24$4.12
Feb 20253,6573,6695,6143,65970$71.53$4.19
Jan 20254,2404,2136,6224,282211$75.74$4.13
Dec 20244,6594,6567,3824,976141$70.12$3.01
Nov 20243,9353,9275,5793,92098$69.95$2.12
Oct 20243,1543,1626,7494,975106$71.99$2.20
Sep 20243,7313,7405,8204,44593$70.24$2.28
Aug 20244,3444,3366,9785,39771$76.68$1.99
Jul 20243,7603,7627,2925,74963$81.80$2.07
Jun 20243,7773,8047,7485,733128$79.77$2.54
May 20244,2124,2026,6563,681171$80.02$2.12
Apr 20243,5273,5365,2312,639183$85.35$1.60
Mar 20244,6414,6317,3054,23681$81.28$1.49
Feb 20244,7254,7335,7403,98473$77.25$1.72
Jan 20244,5974,6126,4794,197123$74.15$3.18
Dec 20235,2905,2827,9685,621118$71.90$2.52
Nov 20235,2555,2467,6355,425119$77.69$2.71
Oct 20235,8785,8838,5946,244167$85.64$2.98
Sep 20236,2366,2417,8965,564283$89.43$2.64
Aug 20236,9806,98310,1787,906114$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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