Skip to content
Royalty Clerk

Texas oil lease

Producing

HIERHOLZER SEEWALD RETZLOFF SA3

Hierholzer Seewald Retzloff Sa3 is an oil lease in Atascosa County, Texas, operated by Marathon Oil Ef LLC in the Eagleville (Eagle Ford-1) field.

1 well

6,973bbl oil, last 12 months−93% vs prior year
Operator
Marathon Oil Ef LLC
County
Atascosa County
Field
Eagleville (Eagle Ford-1)
RRC lease
01-21175

Is your check right?

Check my statement

Where it sits

This county

Atascosa CountyAtascosaWilsonMedinaKarnesFrioBexarAtascosa County
Atascosa County
Gas, last 12 months
7,809 mcf
Oil in Jul 2026
166 bbl

Production by month

Oil output fell 93% over the last 12 months

  • Oil (bars)
  • Gas (line)
  • Last 12 months
Oil output fell 93% over the last 12 monthsMonthly oil production and gas for HIERHOLZER SEEWALD RETZLOFF SA3, Mar 2024 to Jul 2026. Oil output fell 93% over the last 12 months. 6,973 bbl in the 12 months through Jul 2026, against 105,614 bbl in the 12 months before.Last 12 months: 6,973 bblbbl per monthmcf per month0010k10k20k20k30k30k40k40kApr 24JulOctJan 25AprJulOctJan 26AprJul
Oil output fell 93% over the last 12 monthsMonthly oil production and gas for HIERHOLZER SEEWALD RETZLOFF SA3, Mar 2024 to Jul 2026. Oil output fell 93% over the last 12 months. 6,973 bbl in the 12 months through Jul 2026, against 105,614 bbl in the 12 months before.Last 12 monthsbbl per monthmcf per month0010k10k20k20k30k30k40k40kJul 24Jan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

Where the gas went

87% of the gas went to a processing plant in the last 12 months

Flaring peaked at 4.0% of the gas in Aug 2025.

  • Processing plant (3)
  • Lease fuel (1)
  • Flared (4)
87% of the gas went to a processing plant in the last 12 monthsShare of HIERHOLZER SEEWALD RETZLOFF SA3 gas by disposition code each month, Mar 2024 to Jul 2026. 87% of the gas went to a processing plant in the last 12 months. Flaring peaked at 4.0% of the gas in Aug 2025.Share of the lease’s gas by disposition code, per month0%50%100%Flared 4.0%Apr 24JulOctJan 25AprJulOctJan 26AprJul
87% of the gas went to a processing plant in the last 12 monthsShare of HIERHOLZER SEEWALD RETZLOFF SA3 gas by disposition code each month, Mar 2024 to Jul 2026. 87% of the gas went to a processing plant in the last 12 months. Flaring peaked at 4.0% of the gas in Aug 2025.Share of gas by disposition code0%50%100%Flared 4.0%Jul 24Jan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

  • Processing plant (3)

    87% · 6,764 mcf

  • Lease fuel (1)

    12% · 972 mcf

  • Flared (4)

    0.9% · 73 mcf

0.9% of the gas flared in the last 12 months. 6 months above 3%.

1 well on this lease

Wells on HIERHOLZER SEEWALD RETZLOFF SA3
API numberWell no.Status
42-013-360373HActive

SourceTexas Railroad Commission Wellbore Query.

Buyers and gatherers

Companies named on the Form P-4, by product
CompanyProductRoleShare%From
Enterprise Crude Oil LLCOilGathers34Aug 29, 2023
Endeavor Crude, LLCOilGathers33Aug 29, 2023
Enterprise Crude Pipeline LLCOilGathers33Aug 29, 2023
Marathon Oil Ef LLCCasinghead gasBuys100Aug 29, 2023
Marathon Oil Ef LLCCasinghead gasGathers100Aug 29, 2023

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

Who buys my oilOil price check

640 acres on the newest permit

  • Worth asking

    An allocation well is on this lease

    A well drilled across several tracts shares its production by an allocation formula, so the decimal is not always your acres over the unit acres. Ask the operator for the allocation formula and the tract factor for your land.

  • 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 Hierholzer Seewald Retzloff Sa3
API numberWell no.Acreson the permit
42-013-360373H640

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

29 months, newest first

Ledger for HIERHOLZER SEEWALD RETZLOFF SA3
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 20261661673382853$80.46$2.89
Jun 20263653695324492$84.81$3.15
May 20266096129738008$102.13$2.94
Apr 20267557569358374$100.32$2.77
Mar 20261,0251,0301,4371,3036$91.38$3.04
Feb 20269349177506744$64.51$3.62
Jan 20266681550$60.04$7.72
Dec 20259129021,2101,01810$57.97$4.26
Nov 20254344353082614$60.06$3.79
Oct 20255225233813422$60.89$3.19
Sep 20255415443432996$63.96$2.97
Aug 202564464159749124$64.86$2.91
Jul 202572872879866124$68.39$3.20
Jun 202588088081369723$68.17$3.02
May 20251,2241,2211,01487619$62.17$3.12
Apr 20251,0311,04293580219$63.54$3.42
Mar 20253,3723,38381169719$68.24$4.12
Feb 20254,3864,5004,7333,96448$71.53$4.19
Jan 20259,95110,00211,8709,849232$75.74$4.13
Dec 202414,02914,00821,66018,463144$70.12$3.01
Nov 202415,28915,27816,66214,511179$69.95$2.12
Oct 202417,03617,01617,65015,279313$71.99$2.20
Sep 202415,77215,86916,97514,818362$70.24$2.28
Aug 202421,91621,91021,11818,420267$76.68$1.99
Jul 202421,68121,60422,18818,810865$81.80$2.07
Jun 202419,84119,82121,07517,835741$79.77$2.54
May 202425,41525,46726,40822,532925$80.02$2.12
Apr 202427,94327,90925,45422,031798$85.35$1.60
Mar 202428,33428,18323,74220,993422$81.28$1.49

Flared above 3%

SourceTexas Railroad Commission Production Data Query, through Jul 2026. Prices: EIA, through Aug 2026. Updated Oct 2, 2026.

How to check your stub against this lease Checks stopped on this lease? See the likely reasons

Do your checks match this lease?

Check my statement

Nearby

This lease belongs to

OperatorMarathon Oil Ef LLCFieldEagleville (Eagle Ford-1)CountyAtascosa County

Marathon Oil Ef LLC in Atascosa County

All Marathon Oil Ef LLC leases →

Eagleville (Eagle Ford-1) field

All leases in this field →

Leases within 10 km

Drilling permits within 10 km