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Royalty Clerk

Texas oil lease · RRC district 01 · Lease 15638

Producing

MIDDLE MCCOWEN

Middle McCowen 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 3,408,305 bbl of oil in the 12 months through Jul 2026.

Oil lease dossier · 123 wells

3,408,305bbl oil, last 12 months−36% vs prior year
Operator
Marathon Oil Ef LLC
County
Atascosa County
Field
Eagleville (Eagle Ford-1)
RRC lease
01-15638

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Where it sits

This county

Atascosa CountyAtascosaWilsonMedinaKarnesFrioBexarAtascosa County
Atascosa County · RRC district 01Open Atascosa County →
Gas, last 12 months
2,528,022 mcf
Oil in Jul 2026
215,849 bbl
Reporting to the state
since Jan 2020
Wells
123

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 36% over the last 12 months

3,408,305 bbl in the 12 months through Jul 2026, against 5,297,703 bbl in the 12 months before.

  • Oil (bars, left axis)
  • Gas (line, right axis)
  • Last 12 months
Oil output fell 36% over the last 12 monthsMonthly oil production and gas for MIDDLE MCCOWEN, Aug 2023 to Jul 2026. Oil output fell 36% over the last 12 months. 3,408,305 bbl in the 12 months through Jul 2026, against 5,297,703 bbl in the 12 months before.Last 12 months: 3,408,305 bblbbl per monthmcf per month00250k200k500k400k750k600k1M800kOct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output fell 36% over the last 12 monthsMonthly oil production and gas for MIDDLE MCCOWEN, Aug 2023 to Jul 2026. Oil output fell 36% over the last 12 months. 3,408,305 bbl in the 12 months through Jul 2026, against 5,297,703 bbl in the 12 months before.Last 12 monthsbbl per monthmcf per month00250k200k500k400k750k600k1M800kJan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, oil lease 15638, 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.

76% of the gas went to a processing plant in the last 12 months

Each bar is one month. Colors are the disposition codes the operator reported.

  • Processing plant (3)
  • Lease fuel (1)
  • Flared (4)
76% of the gas went to a processing plant in the last 12 monthsShare of MIDDLE MCCOWEN gas by disposition code each month, Aug 2023 to Jul 2026. 76% of the gas went to a processing plant in the last 12 months. Share of the lease’s gas by disposition code, per month0%50%100%Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
76% of the gas went to a processing plant in the last 12 monthsShare of MIDDLE MCCOWEN gas by disposition code each month, Aug 2023 to Jul 2026. 76% of the gas went to a processing plant in the last 12 months. Share of gas by disposition code0%50%100%Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, gas disposition by code, lease 15638, 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, 1.3% of the gas was flared. No month went above 3%.

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

123 wells on this lease

Every well the Railroad Commission links to oil lease 15638 in district 01. The API number is the state’s ID for a well.
Wells on MIDDLE MCCOWEN
API numberWell no.Status
42-013-343711HActive
42-013-343842HShut-in
42-013-343854HActive
42-013-343863HActive
42-013-344765HShut-in
42-013-344776HActive
42-013-344787HShut-in
42-013-344808HActive
42-013-344819HActive
42-013-3448210HActive
42-013-3448311IActive
42-013-3448412IActive
42-013-3449517HActive
42-013-3449618HActive
42-013-3451829HActive
42-013-3452030HShut-in
42-013-3456616HActive
42-013-3456919HActive
42-013-3457020HActive
42-013-3457623HShut-in
42-013-3457722HShut-in
42-013-3457824HActive
42-013-3457925HActive
42-013-3458021HActive
42-013-3467537HShut-in
42-013-3467638HActive
42-013-3467739HActive
42-013-3472348HShut-in
42-013-3472449HActive
42-013-3472851HShut-in
42-013-3472953HActive
42-013-3493673HShut-in
42-013-3493772HShut-in
42-013-35070112HActive
42-013-35071156HActive
42-013-35072111HActive
42-013-35076110HActive
42-013-35078155HActive
42-013-35080121HActive
42-013-3512671HActive
42-013-35530158HActive
42-013-35531157HActive
42-013-35532166HActive
42-013-35533167HActive
42-013-35780171HActive
42-013-35781172HActive
42-013-35782173HActive
42-013-35825185HActive
42-013-35826186HActive
42-013-35827187HActive
42-013-35949115HActive
42-013-35950116HActive
42-013-35951117HActive
42-013-35952118HActive
42-013-35953119HActive
42-013-35954120HActive
42-013-35955122HActive
42-013-35956123HActive
42-013-35957124HActive
42-013-35960106HActive
42-013-35961311HActive
42-013-35962312HActive
42-013-35963113HActive
42-013-35964114HActive
42-013-35965188HActive
42-013-35966289HActive
42-013-35967290HActive
42-013-36091257HActive
42-013-36092259HActive
42-013-36093260HActive
42-013-36094103HActive
42-013-36095105HActive
42-013-36096274HActive
42-013-36097174HActive
42-013-36098175HActive
42-013-36099178HActive
42-013-36100177HActive
42-013-36101179HActive
42-013-36102176HActive
42-013-36103180HActive
42-013-36104181HActive
42-013-36105182HActive
42-013-36106183HActive
42-013-36107184HActive
42-013-36188139HActive
42-013-36189138HActive
42-013-36190136HActive
42-013-36191196HActive
42-013-36192195HActive
42-013-36193194HActive
42-013-36194197HActive
42-013-36195140HShut-in
42-013-36196137HActive
42-013-36197191HActive
42-013-36198192HActive
42-013-36199133HShut-in
42-013-36215133HRActive
42-311-3484915HActive
42-311-3491114HShut-in
42-311-3491213HActive
42-311-3544155HActive
42-311-3544256HActive
42-311-3544357HActive
42-311-3544558HActive
42-311-3550765HShut-in
42-311-3550870HActive
42-311-3553366HActive
42-311-3553467HActive
42-311-3553568HActive
42-311-3553669HActive
42-311-3646088HActive
42-311-3646189HShut-in
42-311-36462189HActive
42-311-36611190HActive
42-311-3661290HActive
42-311-3661391HActive
42-311-3673498HActive
42-311-3673593HActive
42-311-3673692HActive
42-311-3693299HActive
42-311-36933100HShut-in
42-311-36934101HActive
42-311-36935102HActive

SourceTexas Railroad Commission Wellbore Query, district 01, lease 15638.

Estimator

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Estimator

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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 MIDDLE MCCOWEN 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.

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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 MIDDLE MCCOWEN
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3Flaredmcf, code 4WTI$ per bblHenry Hub$ per MMBtu
Jul 2026Marathon Oil215,849215,997162,670115,3302,593$80.46$2.89
Jun 2026Marathon Oil221,654221,388178,914129,3281,884$84.81$3.15
May 2026Marathon Oil220,892221,367181,541130,8032,323$102.13$2.94
Apr 2026Marathon Oil240,238240,199200,982151,5981,672$100.32$2.77
Mar 2026Marathon Oil292,426292,166232,960179,2362,683$91.38$3.04
Feb 2026Marathon Oil244,117244,295195,567148,8442,312$64.51$3.62
Jan 2026Marathon Oil275,626275,926199,823149,3982,919$60.04$7.72
Dec 2025Marathon Oil301,212300,622214,979166,7412,218$57.97$4.26
Nov 2025Marathon Oil308,350308,172212,468164,3582,634$60.06$3.79
Oct 2025Marathon Oil361,999362,223274,475222,0032,685$60.89$3.19
Sep 2025Marathon Oil373,408374,636240,765190,9753,830$63.96$2.97
Aug 2025Marathon Oil352,534351,112232,878177,8895,795$64.86$2.91
Jul 2025Marathon Oil447,442447,327291,689237,6652,897$68.39$3.20
Jun 2025Marathon Oil436,829437,527307,284256,0272,007$68.17$3.02
May 2025Marathon Oil647,637647,914423,412365,9012,380$62.17$3.12
Apr 2025Marathon Oil617,304616,276363,583309,6673,329$63.54$3.42
Mar 2025Marathon Oil305,323305,485229,015182,7602,745$68.24$4.12
Feb 2025Marathon Oil251,049251,120195,903153,6752,476$71.53$4.19
Jan 2025Marathon Oil323,271323,267250,308200,5103,452$75.74$4.13
Dec 2024Marathon Oil365,861365,999301,299246,7803,235$70.12$3.01
Nov 2024Marathon Oil390,641390,280320,129265,8712,980$69.95$2.12
Oct 2024Marathon Oil451,569451,531322,415269,6644,988$71.99$2.20
Sep 2024Marathon Oil479,315479,158345,534296,3325,013$70.24$2.28
Aug 2024Marathon Oil581,462581,497406,967356,5994,836$76.68$1.99
Jul 2024Marathon Oil681,377681,387471,410421,6782,591$81.80$2.07
Jun 2024Marathon Oil818,696818,698535,992484,4464,227$79.77$2.54
May 2024Marathon Oil701,394701,339432,456385,4674,283$80.02$2.12
Apr 2024Marathon Oil288,223287,689182,278155,1422,854$85.35$1.60
Mar 2024Marathon Oil167,040167,782160,863132,6141,932$81.28$1.49
Feb 2024Marathon Oil205,780205,272199,720176,9952,063$77.25$1.72
Jan 2024Marathon Oil234,173234,181220,598195,5813,734$74.15$3.18
Dec 2023Marathon Oil254,770254,837227,942206,5291,649$71.90$2.52
Nov 2023Marathon Oil277,607277,781223,598202,4081,538$77.69$2.71
Oct 2023Marathon Oil327,872327,791255,257233,2451,656$85.64$2.98
Sep 2023Marathon Oil364,854365,154280,456256,0541,939$89.43$2.64
Aug 2023Marathon Oil444,048444,167329,711306,6002,155$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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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

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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 15638, 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.