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Texas oil lease

Producing

HIERHOLZER SEEWALD UNIT

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

1 well

1,992bbl oil, last 12 months−78% vs prior year
Operator
Marathon Oil Ef LLC
County
Atascosa County
Field
Eagleville (Eagle Ford-1)
RRC lease
01-15599

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Where it sits

This county

Atascosa CountyAtascosaWilsonMedinaKarnesFrioBexarAtascosa County
Atascosa County
Gas, last 12 months
437 mcf
Oil in Jul 2026
283 bbl

Production by month

Oil output fell 78% over the last 12 months

  • Oil (bars)
  • Gas (line)
  • Last 12 months
Oil output fell 78% over the last 12 monthsMonthly oil production and gas for HIERHOLZER SEEWALD UNIT, Aug 2023 to Jul 2026. Oil output fell 78% over the last 12 months. 1,992 bbl in the 12 months through Jul 2026, against 8,984 bbl in the 12 months before.Last 12 months: 1,992 bblbbl per monthmcf per month001,0005002,0001,0003,0001,5004,0002,0005,0002,500Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output fell 78% over the last 12 monthsMonthly oil production and gas for HIERHOLZER SEEWALD UNIT, Aug 2023 to Jul 2026. Oil output fell 78% over the last 12 months. 1,992 bbl in the 12 months through Jul 2026, against 8,984 bbl in the 12 months before.Last 12 monthsbbl per monthmcf per month001,0005002,0001,0003,0001,5004,0002,0005,0002,500Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

Where the gas went

Since Mar 2024 the lease's gas goes to a processing plant instead of lease fuel

Flaring peaked at 13.0% of the gas in Aug 2023.

  • Processing plant (3)
  • Lease fuel (1)
  • Flared (4)
Since Mar 2024 the lease's gas goes to a processing plant instead of lease fuelShare of HIERHOLZER SEEWALD UNIT gas by disposition code each month, Aug 2023 to Jul 2026. Since Mar 2024 the lease's gas goes to a processing plant instead of lease fuel. Flaring peaked at 13.0% of the gas in Aug 2023.Share of the lease’s gas by disposition code, per month0%50%100%Mar 2024: fuel to plantFlared 13.0%Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Since Mar 2024 the lease's gas goes to a processing plant instead of lease fuelShare of HIERHOLZER SEEWALD UNIT gas by disposition code each month, Aug 2023 to Jul 2026. Since Mar 2024 the lease's gas goes to a processing plant instead of lease fuel. Flaring peaked at 13.0% of the gas in Aug 2023.Share of gas by disposition code0%50%100%Mar 24: fuel to plantFlared 13.0%Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

  • Processing plant (3)

    86% · 550 mcf

  • Lease fuel (1)

    13% · 85 mcf

  • Flared (4)

    0.9% · 6 mcf

0.9% of the gas flared in the last 12 months. 5 months above 3%.

1 well on this lease

Wells on HIERHOLZER SEEWALD UNIT
API numberWell no.Status
42-013-343411HActive

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–
Genesis Crude Oil, L.p.OilGathers25Jul 1, 2022–
Reynolds Energy Transport LLCOilGathers25Jul 1, 2022–
Statewide Crude Inc.OilGathers25Jul 1, 2022–
Marathon Oil Ef LLCCasinghead gasBuys100Jul 1, 2022–
Marathon Oil Ef LLCCasinghead gasGathers100Jul 1, 2022–
Enterprise Crude Oil LLCOilGathers20Nov 1, 2011Jul 1, 2022
Genesis Crude Oil, L.p.OilGathers10Nov 1, 2011Jul 1, 2022
Gulfmark Energy, Inc.OilGathers35Nov 1, 2011Jul 1, 2022
Permian Crude Transport, LPOilGathers5Dec 1, 2016Jul 1, 2022
Shell Trading (Us) CompanyOilGathers20Nov 1, 2011Jul 1, 2022
Statewide Crude Inc.OilGathers10Nov 1, 2011Jul 1, 2022

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

Who buys my oilOil price check

320 acres on the newest permit

Check your decimal on this lease
Permits for Hierholzer Seewald Unit
API numberWell no.Acreson the permit
42-013-343411H320

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 HIERHOLZER SEEWALD UNIT
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 202628327863531$80.46$2.89
Jun 202609000$84.81$3.15
May 20266916821481221$102.13$2.94
Apr 202604000$100.32$2.77
Mar 202633232969630$91.38$3.04
Feb 2026565512110$64.51$3.62
Jan 202603000$60.04$7.72
Dec 202517417145380$57.97$4.26
Nov 202505000$60.06$3.79
Oct 202538838486771$60.89$3.19
Sep 2025656414120$63.96$2.97
Aug 202533000$64.86$2.91
Jul 20251919870$68.39$3.20
Jun 202500000$68.17$3.02
May 20254949980$62.17$3.12
Apr 2025919117150$63.54$3.42
Mar 2025969772622$68.24$4.12
Feb 202514217498821$71.53$4.19
Jan 20252,3722,3791,18097923$75.74$4.13
Dec 20242,9652,9542,0671,76214$70.12$3.01
Nov 20242,5712,5462,1491,87223$69.95$2.12
Oct 20244764731,9871,72035$71.99$2.20
Sep 202411111146740810$70.24$2.28
Aug 2024929171621$76.68$1.99
Jul 202400000$81.80$2.07
Jun 202400000$79.77$2.54
May 2024454536311$80.02$2.12
Apr 202400000$85.35$1.60
Mar 202445451,09496819$81.28$1.49
Feb 202400000$77.25$1.72
Jan 202403000$74.15$3.18
Dec 202311312055195$71.90$2.52
Nov 2023446446430050$77.69$2.71
Oct 2023572571664044$85.64$2.98
Sep 202331832247112735$89.43$2.64
Aug 2023664662797184104$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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