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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

20,928mcf gas, last 12 months−15% vs prior year
Operator
Marathon Oil Ef LLC
County
Karnes County
Field
Sugarkane (Austin Chalk)
RRC lease
02-283164

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Where it sits

This county

Karnes CountyKarnesAtascosaGoliadWilsonGonzalesDe WittBexarKarnes County
Karnes County
Oil, last 12 months
6,230 bbl
Gas in Jul 2026
566 mcf

Production by month

Gas output fell 15% over the last 12 months

  • Gas (bars)
  • Oil (line)
  • Last 12 months
Gas output fell 15% over the last 12 monthsMonthly gas production and oil for SIENKIEWICZ UNIT AC, Aug 2023 to Jul 2026. Gas output fell 15% over the last 12 months. 20,928 mcf in the 12 months through Jul 2026, against 24,529 mcf in the 12 months before.Last 12 months: 20,928 mcfmcf per monthbbl per month001,0002002,0004003,0006004,0008005,0001,000Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Gas output fell 15% over the last 12 monthsMonthly gas production and oil for SIENKIEWICZ UNIT AC, Aug 2023 to Jul 2026. Gas output fell 15% over the last 12 months. 20,928 mcf in the 12 months through Jul 2026, against 24,529 mcf in the 12 months before.Last 12 monthsmcf per monthbbl per month001,0002002,0004003,0006004,0008005,0001,000Jan 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

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

  • 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. 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
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. 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)

    76% · 17,079 mcf

  • Lease fuel (1)

    23% · 5,235 mcf

  • Flared (4)

    1.3% · 289 mcf

1.3% 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
42-255-347943HShut-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 13, 2016
Marathon Oil Ef LLCCondensateGathers5Feb 13, 2016
Statewide Crude Inc.CondensateGathers5Feb 13, 2016
Trafigura Trading LLCCondensateGathers5Feb 13, 2016
Marathon Oil Ef LLCGas-well gasBuys100Feb 13, 2016
Marathon Oil Ef LLCGas-well gasGathers100Feb 13, 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
42-255-347943H764.49

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 20262112025664751$80.46$2.89
Jun 2026021000$84.81$3.15
May 20264735201,5151,17126$102.13$2.94
Apr 20266896721,7851,28866$100.32$2.77
Mar 20266946852,2111,64635$91.38$3.04
Feb 20267036992,4221,83812$64.51$3.62
Jan 20265865871,9401,48025$60.04$7.72
Dec 20257747592,0371,48131$57.97$4.26
Nov 20256386361,8661,48419$60.06$3.79
Oct 20255575632,2831,75924$60.89$3.19
Sep 20254294242,1581,70526$63.96$2.97
Aug 20254764842,1451,62713$64.86$2.91
Jul 20255225181,6751,12511$68.39$3.20
Jun 20254864801,8281,38415$68.17$3.02
May 20255905932,6882,0398$62.17$3.12
Apr 20255845782,7472,08111$63.54$3.42
Mar 20254724781,9021,4696$68.24$4.12
Feb 20254044051,3301,01412$71.53$4.19
Jan 20256056052,0491,61713$75.74$4.13
Dec 20245895909827455$70.12$3.01
Nov 20246025981,3441,0528$69.95$2.12
Oct 20246006001,02884213$71.99$2.20
Sep 20248058153,0262,46213$70.24$2.28
Aug 20248318353,9303,2218$76.68$1.99
Jul 20247687543,4342,87610$81.80$2.07
Jun 20247487514,2373,6089$79.77$2.54
May 20248308264,1143,5019$80.02$2.12
Apr 20248758843,6033,05810$85.35$1.60
Mar 20249899753,5483,09310$81.28$1.49
Feb 20247737783,4082,88110$77.25$1.72
Jan 20248408303,5192,84430$74.15$3.18
Dec 20235905913,0582,46411$71.90$2.52
Nov 20236056073,7183,13113$77.69$2.71
Oct 20238298233,9783,44710$85.64$2.98
Sep 20235435443,1382,7056$89.43$2.64
Aug 20236736744,3153,7527$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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