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Texas oil lease

Producing

SPAHN-MIKKELSON UNIT

Spahn-Mikkelson Unit is an oil lease in Karnes County, Texas, operated by Marathon Oil Ef LLC in the Eagleville (Eagle Ford-2) field.

4 wells

28,180bbl oil, last 12 months+23% vs prior year
Operator
Marathon Oil Ef LLC
County
Karnes County
Field
Eagleville (Eagle Ford-2)
RRC lease
02-10060

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Where it sits

This county

Karnes CountyKarnesAtascosaGoliadWilsonGonzalesDe WittBexarKarnes County
Karnes County
Gas, last 12 months
36,114 mcf
Oil in Jul 2026
1,153 bbl

Production by month

Oil output rose 23% over the last 12 months

  • Oil (bars)
  • Gas (line)
  • Last 12 months
Oil output rose 23% over the last 12 monthsMonthly oil production and gas for SPAHN-MIKKELSON UNIT, Aug 2023 to Jul 2026. Oil output rose 23% over the last 12 months. 28,180 bbl in the 12 months through Jul 2026, against 22,842 bbl in the 12 months before.Last 12 months: 28,180 bblbbl per monthmcf per month002,0002,5004,0005,0006,0007,5008,00010k10k12.5kOct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output rose 23% over the last 12 monthsMonthly oil production and gas for SPAHN-MIKKELSON UNIT, Aug 2023 to Jul 2026. Oil output rose 23% over the last 12 months. 28,180 bbl in the 12 months through Jul 2026, against 22,842 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

71% of the gas went to a processing plant in the last 12 months

Flaring peaked at 3.6% of the gas in Jan 2024.

  • Processing plant (3)
  • Lease fuel (1)
  • Flared (4)
71% of the gas went to a processing plant in the last 12 monthsShare of SPAHN-MIKKELSON UNIT gas by disposition code each month, Aug 2023 to Jul 2026. 71% of the gas went to a processing plant in the last 12 months. Flaring peaked at 3.6% of the gas in Jan 2024.Share of the lease’s gas by disposition code, per month0%50%100%Flared 3.6%Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
71% of the gas went to a processing plant in the last 12 monthsShare of SPAHN-MIKKELSON UNIT gas by disposition code each month, Aug 2023 to Jul 2026. 71% of the gas went to a processing plant in the last 12 months. Flaring peaked at 3.6% of the gas in Jan 2024.Share of gas by disposition code0%50%100%Flared 3.6%Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

  • Processing plant (3)

    71% · 25,608 mcf

  • Lease fuel (1)

    28% · 10,153 mcf

  • Flared (4)

    1.0% · 353 mcf

1.0% of the gas flared in the last 12 months. One month above 3%.

4 wells on this lease

Wells on SPAHN-MIKKELSON UNIT
API numberWell no.Status
42-255-324081HActive
42-255-325512HShut-in
42-255-363753HActive
42-255-36376503HActive

SourceTexas Railroad Commission Wellbore Query.

Buyers and gatherers

Companies named on the Form P-4, by product
CompanyProductRoleShare%FromUntil
Enterprise Crude Oil LLCOilGathers20May 26, 2012–
Genesis Crude Oil, L.p.OilGathers20Jul 1, 2022–
Reynolds Energy Transport LLCOilGathers20Jul 1, 2022–
Shell Trading (Us) CompanyOilGathers20May 26, 2012–
Statewide Crude Inc.OilGathers20Jul 1, 2022–
Marathon Oil Ef LLCCasinghead gasBuys100Jul 1, 2022–
Marathon Oil Ef LLCCasinghead gasGathers100Jul 1, 2022–
Genesis Crude Oil, L.p.OilGathers10May 26, 2012Jul 1, 2022
Gulfmark Energy, Inc.OilGathers35May 26, 2012Jul 1, 2022
Permian Crude Transport, LPOilGathers5Dec 1, 2016Jul 1, 2022
Statewide Crude Inc.OilGathers10May 26, 2012Jul 1, 2022

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

Who buys my oilOil price check

186.98 acres on the newest permit

  • Good to know

    A pooling certificate (P-12) was filed

    Your tract may share its production with neighbors in a pooled unit. The unit acres the operator uses to divide production can differ from the acreage on one 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 Spahn-Mikkelson Unit
API numberWell no.Acreson the permit
42-255-363753H186.98
42-255-36376503H186.98
42-255-325512H186.98
42-255-324081H186.98

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 SPAHN-MIKKELSON UNIT
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 20261,1531,1841711182$80.46$2.89
Jun 20262,0402,0537305274$84.81$3.15
May 20262,1032,0371,5551,17614$102.13$2.94
Apr 20261,3181,3381,16184816$100.32$2.77
Mar 20262,0352,0082,3101,67526$91.38$3.04
Feb 20261,1901,2751,6071,25119$64.51$3.62
Jan 20266,5136,4541,9651,50324$60.04$7.72
Dec 20252,3112,31211,0488,43496$57.97$4.26
Nov 20252,6502,6725,4913,69240$60.06$3.79
Oct 20253,0553,0416,3014,09250$60.89$3.19
Sep 20252,8442,7991,51797223$63.96$2.97
Aug 20259689752,2581,32039$64.86$2.91
Jul 20251,3691,3694,4012,45750$68.39$3.20
Jun 20251,4571,4541,69892115$68.17$3.02
May 20251,6621,6581,49386710$62.17$3.12
Apr 20251,6331,6441,51092811$63.54$3.42
Mar 20252,0372,0233,1331,92817$68.24$4.12
Feb 20251,4251,4493452122$71.53$4.19
Jan 20251,7721,763120731$75.74$4.13
Dec 20241,6951,6961,8781,2089$70.12$3.01
Nov 20242,2462,2573,5812,39224$69.95$2.12
Oct 20242,5732,5675,6843,83726$71.99$2.20
Sep 20242,2662,2705,0713,53818$70.24$2.28
Aug 20242,7072,7006,2724,12936$76.68$1.99
Jul 20243,0143,0156,4954,35919$81.80$2.07
Jun 20242,7462,7415,1573,11222$79.77$2.54
May 20241,3821,3951,56997315$80.02$2.12
Apr 20242,1612,1592,0911,26246$85.35$1.60
Mar 20243,4733,4736,0633,79971$81.28$1.49
Feb 20242,9662,9886,2553,226155$77.25$1.72
Jan 20243,9233,9187,6033,820277$74.15$3.18
Dec 20233,8523,8328,9504,987138$71.90$2.52
Nov 20232,8462,8547,2744,048136$77.69$2.71
Oct 20233,4073,4057,2084,62291$85.64$2.98
Sep 20233,3693,3587,1664,59460$89.43$2.64
Aug 20232,3232,3335,4742,96593$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)CountyKarnes County

Marathon Oil Ef LLC in Karnes County

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