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Texas oil lease

Producing

SIENKIEWICZ UNIT

Sienkiewicz Unit is an oil lease in Karnes County, Texas, operated by Marathon Oil Ef LLC in the Sugarkane (Eagle Ford) field.

6 wells

7,537bbl oil, last 12 months−22% vs prior year
Operator
Marathon Oil Ef LLC
County
Karnes County
Field
Sugarkane (Eagle Ford)
RRC lease
02-10797

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Where it sits

This county

Karnes CountyKarnesAtascosaGoliadWilsonGonzalesDe WittBexarKarnes County
Karnes County
Gas, last 12 months
10,055 mcf
Oil in Jul 2026
0 bbl

Production by month

Oil output fell 22% over the last 12 months

  • Oil (bars)
  • Gas (line)
  • Last 12 months
Oil output fell 22% over the last 12 monthsMonthly oil production and gas for SIENKIEWICZ UNIT, Aug 2023 to Jul 2026. Oil output fell 22% over the last 12 months. 7,537 bbl in the 12 months through Jul 2026, against 9,718 bbl in the 12 months before.Last 12 months: 7,537 bblbbl per monthmcf per month001,0002,5002,0005,0003,0007,5004,00010k5,00012.5kOct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output fell 22% over the last 12 monthsMonthly oil production and gas for SIENKIEWICZ UNIT, Aug 2023 to Jul 2026. Oil output fell 22% over the last 12 months. 7,537 bbl in the 12 months through Jul 2026, against 9,718 bbl in the 12 months before.Last 12 monthsbbl per monthmcf per month001,0002,5002,0005,0003,0007,5004,00010k5,00012.5kJan 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

  • 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.Share of the lease’s gas by disposition code, per month0%50%100%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.Share of gas by disposition code0%50%100%Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

  • Processing plant (3)

    75% · 24,848 mcf

  • Lease fuel (1)

    24% · 7,957 mcf

  • Flared (4)

    0.7% · 229 mcf

0.7% of the gas flared in the last 12 months. No month above 3%.

6 wells on this lease

Wells on SIENKIEWICZ UNIT
API numberWell no.Status
42-255-324462HActive
42-255-325093HActive
42-255-34063503HActive
42-255-3406510HActive
42-255-34737505HActive
42-255-347394HActive

SourceTexas Railroad Commission Wellbore Query.

Buyers and gatherers

Companies named on the Form P-4, by product
CompanyProductRoleShare%FromUntil
Statewide Crude Inc.OilGathers50Jul 1, 2022–
Plains Pipeline L.p.OilGathers25Jul 1, 2022–
Reynolds Energy Transport LLCOilGathers25Jul 1, 2022–
Marathon Oil Ef LLCCasinghead gasBuys100Nov 28, 2012–
Marathon Oil Ef LLCCasinghead gasGathers100Nov 28, 2012–
Gulfmark Energy, Inc.OilGathers10Nov 28, 2012Jul 1, 2022
Statewide Crude Inc.OilGathers90Nov 28, 2012Jul 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

Permits for Sienkiewicz Unit
API numberWell no.Acreson the permit
42-255-34737505H764.49
42-255-347394H764.49
42-255-34063503H764.49
42-255-3406510H764.49
42-255-325093H764.49
42-255-324462H746.49

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 202600000$80.46$2.89
Jun 202602000$84.81$3.15
May 202649471080$102.13$2.94
Apr 202600000$100.32$2.77
Mar 202601000$91.38$3.04
Feb 20262327320$64.51$3.62
Jan 202673731080$60.04$7.72
Dec 202510613713100$57.97$4.26
Nov 20259601,0397846248$60.06$3.79
Oct 20252,9413,0112,2431,72824$60.89$3.19
Sep 20252,8732,7133,7272,94445$63.96$2.97
Aug 20255125203,2652,47620$64.86$2.91
Jul 20255585624,1892,81426$68.39$3.20
Jun 20256716918,8766,71774$68.17$3.02
May 20251,5691,5676,6925,07619$62.17$3.12
Apr 20251,3491,3153,2222,44113$63.54$3.42
Mar 20255525702,5021,9338$68.24$4.12
Feb 20256456372,0051,52918$71.53$4.19
Jan 20257457342,0601,62514$75.74$4.13
Dec 20244694652,9662,25015$70.12$3.01
Nov 20243693701,1308847$69.95$2.12
Oct 20244634731,6641,36321$71.99$2.20
Sep 20249931,0182,2691,84610$70.24$2.28
Aug 20241,3351,3646,5095,33513$76.68$1.99
Jul 20241,7171,6956,5325,47218$81.80$2.07
Jun 20242,0362,0727,7896,63316$79.77$2.54
May 20243,1213,05311,3159,63123$80.02$2.12
Apr 20241,1051,1134,6113,91313$85.35$1.60
Mar 20241,1541,1334,6064,01613$81.28$1.49
Feb 20246877102,8442,04614$77.25$1.72
Jan 20241,4601,4584,8263,45961$74.15$3.18
Dec 20231,9101,9003,3501,71930$71.90$2.52
Nov 20231,2561,2545,3714,17526$77.69$2.71
Oct 20231,3571,3665,6704,23827$85.64$2.98
Sep 20232,1092,0965,4184,16719$89.43$2.64
Aug 20231,4341,4334,5243,20416$81.39$2.58

SourceTexas Railroad Commission Production Data Query, through Jul 2026. Prices: EIA, through Aug 2026. Updated Sep 28, 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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