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Royalty Clerk

Texas oil lease · RRC district 01 · Lease 10819

Producing

MARBACH

Marbach is an oil lease in Atascosa County, Texas, operated by Calfas Oil, LLC in the Somerset field. The Railroad Commission shows 11 bbl of oil in the 12 months through Jul 2026.

Oil lease dossier · 1 well

11bbl oil, last 12 months−50% vs prior year
Operator
Calfas Oil, LLC
County
Atascosa County
Field
Somerset
RRC lease
01-10819

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Where it sits

This county

Atascosa CountyAtascosaWilsonMedinaKarnesFrioBexarAtascosa County
Atascosa County · RRC district 01Open Atascosa County →
Oil in Jul 2026
1 bbl
Reporting to the state
since Jan 2020
Wells
1
Data through
Jul 2026

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 50% over the last 12 months

11 bbl in the 12 months through Jul 2026, against 22 bbl in the 12 months before.

  • Oil (bars, left axis)
  • Last 12 months
Oil output fell 50% over the last 12 monthsMonthly oil production for MARBACH, Aug 2023 to Jul 2026. Oil output fell 50% over the last 12 months. 11 bbl in the 12 months through Jul 2026, against 22 bbl in the 12 months before.Last 12 months: 11 bblbbl per month03581013Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output fell 50% over the last 12 monthsMonthly oil production for MARBACH, Aug 2023 to Jul 2026. Oil output fell 50% over the last 12 months. 11 bbl in the 12 months through Jul 2026, against 22 bbl in the 12 months before.Last 12 monthsbbl per month03581013Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, oil lease 10819, 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.

No gas disposition reported for this lease

The operator has not reported where the gas went in the months we hold.

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.

The operator changed 2 times, most recently in Nov 2023

If your statements skip or shrink around a change, ask the new operator's owner relations department whether the month is in suspense.

Operators of this lease over timePetrosaurus, Inc., Jan 2020 to Feb 2022; Blackjack Operating L. L. C., Sep 2022 to Oct 2023; Calfas Oil, LLC, Nov 2023 to Jul 20262020202120222023202420252026Changed Sep 2022Changed Nov 2023Petrosaurus, Inc.Jan 2020 to Feb 2022Blackjack Operating L. L. C.Sep 2022 to Oct 2023Calfas Oil, LLCNov 2023 to now
Operators of this lease over timePetrosaurus, Inc., Jan 2020 to Feb 2022; Blackjack Operating L. L. C., Sep 2022 to Oct 2023; Calfas Oil, LLC, Nov 2023 to Jul 20262020202120222023202420252026Changed Sep 2022Changed Nov 2023Petrosaurus, Inc.Jan 2020 to Feb 2022Blackjack Operating L. L. C.Sep 2022 to Oct 2023Calfas Oil, LLCNov 2023 to now

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 10819 in district 01. The API number is the state’s ID for a well.
Wells on MARBACH
API numberWell no.Status
42-013-322231Active

SourceTexas Railroad Commission Wellbore Query, district 01, lease 10819.

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

    Truth Resources, L.p., Dorado Oil Company and Shell Trading (Us) Company gather it.

    Truth Resources, L.p. gathers it: 34% of it, on the list since Nov 17, 2023 · Dorado Oil Company gathers it: 33% of it, on the list since Nov 17, 2023 · Shell Trading (Us) Company gathers it: 33% of it, on the list since Nov 17, 2023

Companies that used to be listed: Ace Gathering, Inc. (gathers it, until Nov 17, 2023); Synergy Transfer, LLC (gathers it, until Nov 17, 2023); Ace Gathering, Inc. (gathers it, until May 16, 2023); Enterprise Crude Oil LLC (gathers it, until Sep 19, 2022); Gulfmark Energy, Inc. (gathers it, until Oct 21, 2019); Enterprise Crude Oil LLC (gathers it, until Jun 17, 2019).

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

81 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
0
First completion
Mar 31, 1984
Latest permit
Aug 26, 1983
Wells and acres on the permits for Marbach
API numberWell no.Acreson the permit
42-013-32223181

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

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 MARBACH sold each month.

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

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.

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 MARBACH
MonthOil producedbblOil soldbblWTI$ per bblHenry Hub$ per MMBtu
Jul 2026Calfas Oil,10$80.46$2.89
Jun 2026Calfas Oil,10$84.81$3.15
May 2026Calfas Oil,10$102.13$2.94
Apr 2026Calfas Oil,10$100.32$2.77
Mar 2026Calfas Oil,10$91.38$3.04
Feb 2026Calfas Oil,20$64.51$3.62
Jan 2026Calfas Oil,10$60.04$7.72
Dec 2025Calfas Oil,00$57.97$4.26
Nov 2025Calfas Oil,10$60.06$3.79
Oct 2025Calfas Oil,00$60.89$3.19
Sep 2025Calfas Oil,10$63.96$2.97
Aug 2025Calfas Oil,10$64.86$2.91
Jul 2025Calfas Oil,10$68.39$3.20
Jun 2025Calfas Oil,10$68.17$3.02
May 2025Calfas Oil,10$62.17$3.12
Apr 2025Calfas Oil,10$63.54$3.42
Mar 2025Calfas Oil,10$68.24$4.12
Feb 2025Calfas Oil,10$71.53$4.19
Jan 2025Calfas Oil,20$75.74$4.13
Dec 2024Calfas Oil,20$70.12$3.01
Nov 2024Calfas Oil,40$69.95$2.12
Oct 2024Calfas Oil,20$71.99$2.20
Sep 2024Calfas Oil,40$70.24$2.28
Aug 2024Calfas Oil,20$76.68$1.99
Jul 2024Calfas Oil,50$81.80$2.07
Jun 2024Calfas Oil,50$79.77$2.54
May 2024Calfas Oil,50$80.02$2.12
Apr 2024Calfas Oil,50$85.35$1.60
Mar 2024Calfas Oil,30$81.28$1.49
Feb 2024Calfas Oil,120$77.25$1.72
Jan 2024Calfas Oil,120$74.15$3.18
Dec 2023Calfas Oil,100$71.90$2.52
Nov 2023Calfas Oil,80$77.69$2.71
Oct 2023Blackjack Operating60$85.64$2.98
Sep 2023Blackjack Operating20$89.43$2.64
Aug 2023Blackjack Operating10$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 MARBACH. We compare volumes, prices, deductions and timing with the state record and give you the exact question to ask Calfas Oil, LLC.

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  • Fees taken on gas
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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

OperatorCalfas Oil, LLCFieldSomersetCountyAtascosa County

Calfas Oil, LLC in Atascosa County

All Calfas Oil, LLC leases →

Somerset field

All leases in this field →

Leases within 10 km

Found by the location of their wells.

New drilling permits in Atascosa County

We do not have coordinates for this lease, so these are the newest permits in its county.

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 10819, 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.