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Texas gas well

Producing

SIENKIEWICZ UNIT

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

Gas well dossier

12,539mcf gas, last 12 months−50% vs prior year
Operator
Marathon Oil Ef LLC
County
Karnes County
Field
Sugarkane (Eagle Ford)
RRC lease
02-290538

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Where it sits

This county

Karnes CountyKarnesAtascosaGoliadWilsonGonzalesDe WittBexarKarnes County
Karnes County
Oil, last 12 months
4,180 bbl
Gas in Jul 2026
650 mcf

Production by month

Gas output fell 50% over the last 12 months

  • Gas (bars)
  • Oil (line)
  • Last 12 months
Gas output fell 50% over the last 12 monthsMonthly gas production and oil for SIENKIEWICZ UNIT, Aug 2023 to Jul 2026. Gas output fell 50% over the last 12 months. 12,539 mcf in the 12 months through Jul 2026, against 25,172 mcf in the 12 months before.Last 12 months: 12,539 mcfmcf per monthbbl per month002,0005004,0001,0006,0001,5008,0002,000Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Gas output fell 50% over the last 12 monthsMonthly gas production and oil for SIENKIEWICZ UNIT, Aug 2023 to Jul 2026. Gas output fell 50% over the last 12 months. 12,539 mcf in the 12 months through Jul 2026, against 25,172 mcf in the 12 months before.Last 12 monthsmcf per monthbbl per month002,0005004,0001,0006,0001,5008,0002,000Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

Where the gas went

75% 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)
75% of the gas went to a processing plant in the last 12 monthsShare of SIENKIEWICZ UNIT gas by disposition code each month, Aug 2023 to Jul 2026. 75% 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
75% of the gas went to a processing plant in the last 12 monthsShare of SIENKIEWICZ UNIT gas by disposition code each month, Aug 2023 to Jul 2026. 75% 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)

    75% · 13,115 mcf

  • Lease fuel (1)

    24% · 4,160 mcf

  • Flared (4)

    1.1% · 186 mcf

1.1% of the gas flared in the last 12 months. One month above 3%.

Wells on this lease

No wells are linked to this lease in our data

Production is still reported at lease level.

Buyers and gatherers

Companies named on the Form P-4, by product
CompanyProductRoleShare%From
Plains Pipeline L.p.CondensateGathers80Jan 11, 2021
Harvest Midstream CompanyCondensateGathers5Jan 11, 2021
Marathon Oil Ef LLCCondensateGathers5Jan 11, 2021
Statewide Crude Inc.CondensateGathers5Jan 11, 2021
Trafigura Trading LLCCondensateGathers5Jan 11, 2021
Marathon Oil Ef LLCGas-well gasBuys100Jan 11, 2021
Marathon Oil Ef LLCGas-well gasGathers100Jan 11, 2021

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
API numberWell no.Acreson the permit
42-255-347394H764.49

SourceRailroad Commission drilling permits, Sep 26, 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
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 202678756505452$80.46$2.89
Jun 2026025000$84.81$3.15
May 20265605941,29299922$102.13$2.94
Apr 20265965541,13581942$100.32$2.77
Mar 202623221525190$91.38$3.04
Feb 2026516000$64.51$3.62
Jan 202617817322170$60.04$7.72
Dec 20251131191290$57.97$4.26
Nov 20253193221,3421,06714$60.06$3.79
Oct 20253854092,4181,86325$60.89$3.19
Sep 20256096242,0881,65025$63.96$2.97
Aug 20251,1051,1403,5552,69622$64.86$2.91
Jul 20251,4941,4413,4502,31722$68.39$3.20
Jun 20256576701,4721,11412$68.17$3.02
May 20251,3511,3743,3112,5129$62.17$3.12
Apr 20251,7591,6885,8314,41823$63.54$3.42
Mar 20252019220$68.24$4.12
Feb 2025023000$71.53$4.19
Jan 202554855758460$75.74$4.13
Dec 20247537849267025$70.12$3.01
Nov 20241,4481,4144,0793,19226$69.95$2.12
Oct 20248077923,8933,18949$71.99$2.20
Sep 20245245181,1869655$70.24$2.28
Aug 20242172669647902$76.68$1.99
Jul 20241,2111,1935,1454,31014$81.80$2.07
Jun 20241,3541,3595,9255,04612$79.77$2.54
May 20241,4521,4525,9845,09312$80.02$2.12
Apr 20241,8341,8376,1695,23518$85.35$1.60
Mar 20241,5591,5524,9764,33814$81.28$1.49
Feb 20241,9231,9285,3494,69612$77.25$1.72
Jan 20241,7931,7765,4644,67935$74.15$3.18
Dec 20231,5281,5315,0264,33213$71.90$2.52
Nov 20231,5991,5706,2915,58015$77.69$2.71
Oct 20231241367,0976,42812$85.64$2.98
Sep 20239079144,8484,3457$89.43$2.64
Aug 20231,5671,5666,1885,6227$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 (Eagle Ford)CountyKarnes County

Marathon Oil Ef LLC in Karnes County

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Sugarkane (Eagle Ford) field

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New drilling permits in Karnes County

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