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Royalty Clerk

Texas oil lease · RRC district 01 · Lease 15669

Producing

HIERHOLZER UNIT

Hierholzer Unit is an oil lease in Atascosa County, Texas, operated by Marathon Oil Ef LLC in the Eagleville (Eagle Ford-1) field. The Railroad Commission shows 726 bbl of oil in the 12 months through Jul 2026.

Oil lease dossier · 1 well

726bbl oil, last 12 months−41% vs prior year
Operator
Marathon Oil Ef LLC
County
Atascosa County
Field
Eagleville (Eagle Ford-1)
RRC lease
01-15669

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Where it sits

This county

Atascosa CountyAtascosaWilsonMedinaKarnesFrioBexarAtascosa County
Atascosa County · RRC district 01Open Atascosa County →
Gas, last 12 months
1,014 mcf
Oil in Jul 2026
430 bbl
Reporting to the state
since Jan 2020
Wells
1

Production

Month by month, from the state record

What the Railroad Commission says this oil lease produced. Oil is in barrels (bbl). Gas is in thousand cubic feet (mcf).

Oil output fell 41% over the last 12 months

726 bbl in the 12 months through Jul 2026, against 1,222 bbl in the 12 months before.

  • Oil (bars, left axis)
  • Gas (line, right axis)
  • Last 12 months
Oil output fell 41% over the last 12 monthsMonthly oil production and gas for HIERHOLZER UNIT, Aug 2023 to Jul 2026. Oil output fell 41% over the last 12 months. 726 bbl in the 12 months through Jul 2026, against 1,222 bbl in the 12 months before.Last 12 months: 726 bblbbl per monthmcf per month00100100200200300300400400500500Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output fell 41% over the last 12 monthsMonthly oil production and gas for HIERHOLZER UNIT, Aug 2023 to Jul 2026. Oil output fell 41% over the last 12 months. 726 bbl in the 12 months through Jul 2026, against 1,222 bbl in the 12 months before.Last 12 monthsbbl per monthmcf per month00100100200200300300400400500500Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, oil lease 15669, district 01. Reported through Jul 2026. The state revises recent months.

Gas disposition

Where the gas went

Every month the operator tells the state where each mcf of gas went, using a code. The code decides how your gas is paid.

85% of the gas went to a processing plant in the last 12 months

Flaring peaked at 4.1% of the gas in Aug 2025.

  • Processing plant (3)
  • Lease fuel (1)
  • Flared (4)
85% of the gas went to a processing plant in the last 12 monthsShare of HIERHOLZER UNIT gas by disposition code each month, Aug 2023 to Jul 2026. 85% of the gas went to a processing plant in the last 12 months. Flaring peaked at 4.1% of the gas in Aug 2025.Share of the lease’s gas by disposition code, per month0%50%100%Flared 4.1%Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
85% of the gas went to a processing plant in the last 12 monthsShare of HIERHOLZER UNIT gas by disposition code each month, Aug 2023 to Jul 2026. 85% of the gas went to a processing plant in the last 12 months. Flaring peaked at 4.1% of the gas in Aug 2025.Share of gas by disposition code0%50%100%Flared 4.1%Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, gas disposition by code, lease 15669, district 01. Reported through Jul 2026.

Processing plant (3)

Sent to a gas plant that pulls out natural gas liquids. Your statement should show plant products, and may show processing fees.

Lease fuel (1)

Burned to run equipment on the lease. Not sold, so it pays no royalty. A few percent is normal.

Flared (4)

Burned off or vented, not sold. It pays no royalty. More than 3% in a month is worth watching.

Over the last 12 months, 2.0% of the gas was flared. 6 months went above 3%, which we mark in the ledger below.

Operator history

Who has run this lease

The operator runs the wells and pays your royalty. When the operator changes, payments often slip for a month or two.

Marathon Oil Ef LLC has reported this lease for the whole period

No change of operator in the months we hold.

Operators of this lease over timeMarathon Oil Ef LLC, Jan 2020 to Jul 20262020202120222023202420252026Marathon Oil Ef LLCJan 2020 to nowthrough Jul 2026
Operators of this lease over timeMarathon Oil Ef LLC, Jan 2020 to Jul 20262020202120222023202420252026Marathon Oil Ef LLCJan 2020 to nowthrough Jul 2026

SourceTexas Railroad Commission Production Data Query, operator by month. Reported through Jul 2026.

Wells

1 well on this lease

Every well the Railroad Commission links to oil lease 15669 in district 01. The API number is the state’s ID for a well.
Wells on HIERHOLZER UNIT
API numberWell no.Status
42-013-343061HActive

SourceTexas Railroad Commission Wellbore Query, district 01, lease 15669.

Who buys and gathers

Who moves and buys this lease's production

The operator files a Form P-4 with the Railroad Commission naming the companies authorised to gather and buy the oil and gas. The buyer's price is the one your royalty is figured on.

  • Oil

    Enterprise Crude Oil LLC, Genesis Crude Oil, L.p., Reynolds Energy Transport LLC and Statewide Crude Inc. gather it.

    Enterprise Crude Oil LLC gathers it: 25% of it, on the list since Jul 1, 2022 · Genesis Crude Oil, L.p. gathers it: 25% of it, on the list since Jul 1, 2022 · Reynolds Energy Transport LLC gathers it: 25% of it, on the list since Jul 1, 2022 · Statewide Crude Inc. gathers it: 25% of it, on the list since Jul 1, 2022

  • Gas from oil wells

    Marathon Oil Ef LLC buys and gathers it.

    Marathon Oil Ef LLC buys it: 100% of it, on the list since Jul 1, 2022 · Marathon Oil Ef LLC gathers it: 100% of it, on the list since Jul 1, 2022

Companies that used to be listed: Enterprise Crude Oil LLC (gathers it, until Jul 1, 2022); Genesis Crude Oil, L.p. (gathers it, until Jul 1, 2022); Gulfmark Energy, Inc. (gathers it, until Jul 1, 2022); Permian Crude Transport, LP (gathers it, until Jul 1, 2022); Shell Trading (Us) Company (gathers it, until Jul 1, 2022); Statewide Crude Inc. (gathers it, until Jul 1, 2022).

SourceRailroad Commission of Texas, Form P-4 file, dated Sep 24, 2026 (source). A listed company is authorised to move or buy the production; the state does not say what it paid.

Who buys my oil and gasIs my oil price fair?

Unit and wells

320 acres on the newest permit

Acres and wells as the operator filed them on its Railroad Commission drilling permits. Your decimal is your net acres over the unit acres, so this is the number to hold your division order against.
Wells on the permits
11 not plugged
Horizontal
1
First completion
May 27, 2010
Latest permit
May 25, 2010
Wells and acres on the permits for Hierholzer Unit
API numberWell no.Acreson the permit
42-013-343061H320

SourceRailroad Commission of Texas, drilling permits and wellbore file, Sep 26, 2026 (source 1, source 2). The acres are what the operator filed; they are not a survey.

Check my decimal against the unit

What the operator reported

What ConocoPhillips told investors it received

Marathon Oil Ef LLC is linked to ConocoPhillips (MRO). Public companies report the average price they realize each quarter. It is an average across everything the company operates, not the price on this lease.
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 on SEC EDGAR, prices before hedging where the company states both. Read by machine from each filing’s tables; the link opens the filing so you can check the figure.

Compare with the price on my stub

Estimator

Estimate your royalty for this lease

A rough check before you look at a statement: the state volumes times your decimal, priced at WTI and Henry Hub.

Estimator

What could your check be?

Your decimal interest is the small number on your division order that says what share of the whole lease (8/8ths) is yours. Type it in and we apply it to what the state says HIERHOLZER UNIT sold each month.

For example 0.00097656, or a fraction like 1/1024.

Dollars per barrel. Your statements show the gap your operator uses. Leave 0 to price oil at WTI.

Your estimate appears here

Enter your decimal to see an estimated royalty for each of the last 12 months this lease reported. Nothing you type leaves your browser.

An estimate, not your check

It ignores gathering and processing fees, taxes, plant products and the price your operator actually gets, so your statement will differ. Use it as a ceiling to compare against. Regional gas prices are often below Henry Hub.

Ledger

36 months, newest first

Compare these numbers with your statements. Your share of a month is the “Oil sold” volume times your decimal. Scroll sideways on a phone.
Monthly production, disposition and prices for HIERHOLZER UNIT
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3Flaredmcf, code 4WTI$ per bblHenry Hub$ per MMBtu
Jul 2026Marathon Oil43042391771$80.46$2.89
Jun 2026Marathon Oil7714120$84.81$3.15
May 2026Marathon Oil00000$102.13$2.94
Apr 2026Marathon Oil00000$100.32$2.77
Mar 2026Marathon Oil0057520$91.38$3.04
Feb 2026Marathon Oil00000$64.51$3.62
Jan 2026Marathon Oil1717330$60.04$7.72
Dec 2025Marathon Oil00000$57.97$4.26
Nov 2025Marathon Oil02000$60.06$3.79
Oct 2025Marathon Oil1381372942642$60.89$3.19
Sep 2025Marathon Oil67672652305$63.96$2.97
Aug 2025Marathon Oil676729023812$64.86$2.91
Jul 2025Marathon Oil747331426010$68.39$3.20
Jun 2025Marathon Oil00000$68.17$3.02
May 2025Marathon Oil00000$62.17$3.12
Apr 2025Marathon Oil11111941664$63.54$3.42
Mar 2025Marathon Oil03000$68.24$4.12
Feb 2025Marathon Oil44344175631$71.53$4.19
Jan 2025Marathon Oil959748401$75.74$4.13
Dec 2024Marathon Oil1931932372022$70.12$3.01
Nov 2024Marathon Oil2822792702353$69.95$2.12
Oct 2024Marathon Oil00000$71.99$2.20
Sep 2024Marathon Oil01000$70.24$2.28
Aug 2024Marathon Oil12412563551$76.68$1.99
Jul 2024Marathon Oil1941931751487$81.80$2.07
Jun 2024Marathon Oil1601611451235$79.77$2.54
May 2024Marathon Oil3503491791536$80.02$2.12
Apr 2024Marathon Oil17617598853$85.35$1.60
Mar 2024Marathon Oil212159521$81.28$1.49
Feb 2024Marathon Oil01000$77.25$1.72
Jan 2024Marathon Oil141519180$74.15$3.18
Dec 2023Marathon Oil899033310$71.90$2.52
Nov 2023Marathon Oil1251241781691$77.69$2.71
Oct 2023Marathon Oil919848450$85.64$2.98
Sep 2023Marathon Oil3283221241161$89.43$2.64
Aug 2023Marathon Oil17417392861$81.39$2.58

No report filed More than 3% of gas flared

SourceVolumes: Texas Railroad Commission Production Data Query, reported through Jul 2026. Prices: EIA WTI Cushing spot and Henry Hub spot, monthly, through Aug 2026. “Gas sold” is gas sent to a transmission line (code 2) or a plant (code 3).

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Upload your statements for HIERHOLZER UNIT. We compare volumes, prices, deductions and timing with the state record and give you the exact question to ask Marathon Oil Ef LLC.

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Around this lease

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Everything on this page connects to the operator, field and county records. Start from any of them.

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

All leases in this field →

Leases within 10 km

Found by the location of their wells.

Drilling permits within 10 km

How to read this page

Questions owners ask

What is a decimal interest?

It is your share of the whole lease, written as a decimal. A 1/4 royalty on 5 net acres in a 1,280-acre unit is 1/4 × 5 ÷ 1,280 = 0.00097656. Your division order states yours.

How do I use this page to check a royalty check?

Take the “Oil sold” volume for the month the check covers and multiply it by your decimal. The answer should match the barrels on your statement. If it does not, upload the statement and we will show where the two differ.

Why is the newest month Jul 2026?

The Railroad Commission publishes production two to three months after the fact and revises recent months. We re-pull the latest three months on every update.

Does this page show what my check should be?

No. It shows what the state recorded. Prices, fees and taxes depend on your lease and on what your operator gets for the oil and gas. The estimator gives a ceiling to compare against.

Sources and method

Where these numbers come from

  • Production and disposition by month: Texas Railroad Commission Production Data Query, oil lease 15669, district 01, reported through Jul 2026.
  • Wells: Texas Railroad Commission Wellbore Query.
  • Prices: U.S. Energy Information Administration, WTI Cushing spot and Henry Hub spot, monthly.
  • Page updated Sep 28, 2026.

We show the state’s numbers as filed. Where the state has no report for a month, we say so instead of guessing.