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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

30,152mcf gas, last 12 months−24% vs prior year
Operator
Marathon Oil Ef LLC
County
Karnes County
Field
Sugarkane (Austin Chalk)
RRC lease
02-283163

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Where it sits

This county

Karnes CountyKarnesAtascosaGoliadWilsonGonzalesDe WittBexarKarnes County
Karnes County
Oil, last 12 months
4,952 bbl
Gas in Jul 2026
4,956 mcf

Production by month

Gas output fell 24% over the last 12 months

  • Gas (bars)
  • Oil (line)
  • Last 12 months
Gas output fell 24% over the last 12 monthsMonthly gas production and oil for SIENKIEWICZ UNIT AC, Aug 2023 to Jul 2026. Gas output fell 24% over the last 12 months. 30,152 mcf in the 12 months through Jul 2026, against 39,552 mcf in the 12 months before.Last 12 months: 30,152 mcfmcf per monthbbl per month002,0002504,0005006,0007508,0001,00010k1,250Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Gas output fell 24% over the last 12 monthsMonthly gas production and oil for SIENKIEWICZ UNIT AC, Aug 2023 to Jul 2026. Gas output fell 24% over the last 12 months. 30,152 mcf in the 12 months through Jul 2026, against 39,552 mcf in the 12 months before.Last 12 monthsmcf per monthbbl per month002,0002504,0005006,0007508,0001,00010k1,250Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

Where the gas went

77% of the gas went to a processing plant in the last 12 months

Flaring peaked at 3.7% of the gas in Apr 2026.

  • Processing plant (3)
  • Lease fuel (1)
  • Flared (4)
77% 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. 77% of the gas went to a processing plant in the last 12 months. Flaring peaked at 3.7% of the gas in Apr 2026.Share of the lease’s gas by disposition code, per month0%50%100%Flared 3.7%Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
77% 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. 77% of the gas went to a processing plant in the last 12 months. Flaring peaked at 3.7% of the gas in Apr 2026.Share of gas by disposition code0%50%100%Flared 3.7%Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

  • Processing plant (3)

    77% · 23,684 mcf

  • Lease fuel (1)

    22% · 6,770 mcf

  • Flared (4)

    1.4% · 419 mcf

1.4% of the gas flared in the last 12 months. One month above 3%.

1 well on this lease

Wells on SIENKIEWICZ UNIT AC
API numberWell no.Status
42-255-347382HShut-in

SourceTexas Railroad Commission Wellbore Query.

Buyers and gatherers

Companies named on the Form P-4, by product
CompanyProductRoleShare%From
Plains Pipeline L.p.CondensateGathers85Feb 25, 2016
Marathon Oil Ef LLCCondensateGathers5Feb 25, 2016
Statewide Crude Inc.CondensateGathers5Feb 25, 2016
Trafigura Trading LLCCondensateGathers5Feb 25, 2016
Marathon Oil Ef LLCGas-well gasBuys100Feb 25, 2016
Marathon Oil Ef LLCGas-well gasGathers100Feb 25, 2016

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
42-255-347382H764.49

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 20265325094,9564,15812$80.46$2.89
Jun 2026020000$84.81$3.15
May 20264444953,2322,49956$102.13$2.94
Apr 20267166824,0142,896149$100.32$2.77
Mar 20265004982,2431,67035$91.38$3.04
Feb 20265745734,2373,21521$64.51$3.62
Jan 20265315391,9931,52125$60.04$7.72
Dec 20258498324,0502,94561$57.97$4.26
Nov 20256676464,5333,60547$60.06$3.79
Oct 202511310914110$60.89$3.19
Sep 2025673953125$63.96$2.97
Aug 202520214853683$64.86$2.91
Jul 202536347214845$68.39$3.20
Jun 2025001,22292510$68.17$3.02
May 20250324193181$62.17$3.12
Apr 20257897643,5572,69514$63.54$3.42
Mar 20251882043,3942,62211$68.24$4.12
Feb 20253843753,1062,36927$71.53$4.19
Jan 20253483414,0753,21427$75.74$4.13
Dec 20241681774,1473,14620$70.12$3.01
Nov 20243713563,4402,69222$69.95$2.12
Oct 202416383,5852,93745$71.99$2.20
Sep 20248478514,7583,87120$70.24$2.28
Aug 20246967207,1285,84214$76.68$1.99
Jul 20241,0841,0575,9554,98817$81.80$2.07
Jun 20248348324,2373,6089$79.77$2.54
May 20247077105,6904,84312$80.02$2.12
Apr 20241,0351,0395,9455,04517$85.35$1.60
Mar 20249649505,9305,17116$81.28$1.49
Feb 20247427575,7905,11312$77.25$1.72
Jan 20241,1801,1675,7394,95835$74.15$3.18
Dec 20239199194,8804,18013$71.90$2.52
Nov 20238768665,2874,62714$77.69$2.71
Oct 20233994056,2755,63912$85.64$2.98
Sep 20238548544,8624,3607$89.43$2.64
Aug 20239569596,5665,9757$81.39$2.58

Flared above 3%

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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