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Texas gas well

Producing

SIENKIEWICZ UNIT AC

Sienkiewicz Unit Ac is a gas well in Karnes County, Texas, operated by Marathon Oil Ef LLC in the Sugarkane (Austin Chalk) field.

1 well

39,264mcf gas, last 12 months−14% vs prior year
Operator
Marathon Oil Ef LLC
County
Karnes County
Field
Sugarkane (Austin Chalk)
RRC lease
02-279741

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Where it sits

This county

Karnes CountyKarnesAtascosaGoliadWilsonGonzalesDe WittBexarKarnes County
Karnes County
Oil, last 12 months
1,240 bbl
Gas in Jul 2026
0 mcf

Checks stopped on this lease?

  • Sales

    Sales over the last 3 months fell to 0% of the 9 months before.

SourceRailroad Commission production, P-5 and P-4 records, data through Jul 2026.

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Production by month

Gas output fell 14% over the last 12 months

  • Gas (bars)
  • Oil (line)
  • Last 12 months
Gas output fell 14% over the last 12 monthsMonthly gas production and oil for SIENKIEWICZ UNIT AC, Aug 2023 to Jul 2026. Gas output fell 14% over the last 12 months. 39,264 mcf in the 12 months through Jul 2026, against 45,463 mcf in the 12 months before.Last 12 months: 39,264 mcfmcf per monthbbl per month005,00020010k40015k60020k800Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Gas output fell 14% over the last 12 monthsMonthly gas production and oil for SIENKIEWICZ UNIT AC, Aug 2023 to Jul 2026. Gas output fell 14% over the last 12 months. 39,264 mcf in the 12 months through Jul 2026, against 45,463 mcf in the 12 months before.Last 12 monthsmcf per monthbbl per month005,00020010k40015k60020k800Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

Where the gas went

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

  • Processing plant (3)
  • Lease fuel (1)
  • Flared (4)
76% of the gas went to a processing plant in the last 12 monthsShare of SIENKIEWICZ UNIT AC 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 SIENKIEWICZ UNIT AC 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, through Jul 2026.

  • Processing plant (3)

    76% · 42,945 mcf

  • Lease fuel (1)

    23% · 12,817 mcf

  • Flared (4)

    0.8% · 475 mcf

0.8% of the gas flared in the last 12 months. No month above 3%.

1 well on this lease

Wells on SIENKIEWICZ UNIT AC
API numberWell no.Status
42-255-340769HActive

SourceTexas Railroad Commission Wellbore Query.

Buyers and gatherers

Companies named on the Form P-4, by product
CompanyProductRoleShare%FromUntil
Enterprise Crude Oil LLCCondensateGathers20Jul 1, 2022–
Harvest Midstream CompanyCondensateGathers20Jul 1, 2022–
Plains Pipeline L.p.CondensateGathers20Jul 1, 2022–
Reynolds Energy Transport LLCCondensateGathers20Jul 1, 2022–
Trafigura Trading LLCCondensateGathers20Jul 1, 2022–
Marathon Oil Ef LLCGas-well gasBuys100Apr 30, 2015–
Marathon Oil Ef LLCGas-well gasGathers100Apr 30, 2015–
Enterprise Crude Oil LLCCondensateGathers5Sep 1, 2018Jul 1, 2022
Gulfmark Energy, Inc.CondensateGathers5Sep 1, 2018Jul 1, 2022
Harvest Midstream CompanyCondensateGathers15Sep 1, 2018Jul 1, 2022
Plains Pipeline L.p.CondensateGathers70Sep 1, 2018Jul 1, 2022
Trafigura Trading LLCCondensateGathers5Sep 1, 2018Jul 1, 2022

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

Who buys my oilOil price check

764.49 acres on the newest permit

Check your decimal on this lease
Permits for Sienkiewicz Unit Ac
API numberWell no.Acreson the permit
42-255-340769H764.49

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 SIENKIEWICZ UNIT AC
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 202602000$80.46$2.89
Jun 20262220320$84.81$3.15
May 202600000$102.13$2.94
Apr 202600000$100.32$2.77
Mar 202603000$91.38$3.04
Feb 20264946110$64.51$3.62
Jan 202609000$60.04$7.72
Dec 20251781802,2241,61734$57.97$4.26
Nov 20252942912,2531,79223$60.06$3.79
Oct 20251982072,0781,60122$60.89$3.19
Sep 202526225715,18611,996184$63.96$2.97
Aug 202523724017,51913,287107$64.86$2.91
Jul 20252542532,7571,85217$68.39$3.20
Jun 20252442468,1056,13467$68.17$3.02
May 20254334382,0121,5266$62.17$3.12
Apr 20255125121,9551,4818$63.54$3.42
Mar 20255595612,1441,6567$68.24$4.12
Feb 20253833793,5102,67731$71.53$4.19
Jan 20254574532,3211,83115$75.74$4.13
Dec 20243523574,5943,48523$70.12$3.01
Nov 20244694598,9076,97156$69.95$2.12
Oct 20242792763,0962,53639$71.99$2.20
Sep 20242632682,5962,11211$70.24$2.28
Aug 20243053113,4662,8417$76.68$1.99
Jul 20243823772,8412,3808$81.80$2.07
Jun 20244594627,8396,67616$79.77$2.54
May 20245115088,0876,88317$80.02$2.12
Apr 20245275225,5824,73716$85.35$1.60
Mar 202427527311,85710,33833$81.28$1.49
Feb 20243113132,3472,1623$77.25$1.72
Jan 20243333302,2281,51432$74.15$3.18
Dec 20232672681,9911,47310$71.90$2.52
Nov 20233213212,5792,08411$77.69$2.71
Oct 20233543552,1081,8545$85.64$2.98
Sep 20234564562,7322,4644$89.43$2.64
Aug 20234974952,9792,6824$81.39$2.58

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 LLCFieldSugarkane (Austin Chalk)CountyKarnes County

Marathon Oil Ef LLC in Karnes County

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Sugarkane (Austin Chalk) field

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