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Texas oil lease

Producing

RIO SAN MARCOS 36-45 UNIT 1A

Rio San Marcos 36-45 Unit 1A is an oil lease in Midland County, Texas, operated by Diamondback E&P LLC in the Spraberry (Trend Area) R 40 Exc field.

5 wells

68,695bbl oil, last 12 months−2% vs prior year
Operator
Diamondback E&P LLC
County
Midland County
Field
Spraberry (Trend Area) R 40 Exc
RRC lease
08-53693

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Where it sits

This county

Midland CountyMidlandMartinAndrewsGlasscockHowardEctorMidland County
Midland County
Gas, last 12 months
754,348 mcf
Oil in Jul 2026
5,867 bbl

Checks stopped on this lease?

  • Operator

    Operator changed: Diamondback E&P LLC took over from Endeavor Energy Resources L.P. in Jan 2025.

  • Buyer

    Buyer changed: ENTERPRISE M B MIDSTREAM LLC replaced ENT NAVITAS MDSTRM MDLND BAS LLC as the buyer of this lease's gas from oil wells on Aug 1, 2025.

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

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Production by month

Oil output held steady over the last 12 months

  • Oil (bars)
  • Gas (line)
  • Last 12 months
Oil output held steady over the last 12 monthsMonthly oil production and gas for RIO SAN MARCOS 36-45 UNIT 1A, Aug 2023 to Jul 2026. Oil output held steady over the last 12 months. 68,695 bbl in the 12 months through Jul 2026, against 70,450 bbl in the 12 months before.Last 12 months: 68,695 bblbbl per monthmcf per month005,00025k10k50k15k75k20k100kOct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output held steady over the last 12 monthsMonthly oil production and gas for RIO SAN MARCOS 36-45 UNIT 1A, Aug 2023 to Jul 2026. Oil output held steady over the last 12 months. 68,695 bbl in the 12 months through Jul 2026, against 70,450 bbl in the 12 months before.Last 12 monthsbbl per monthmcf per month005,00025k10k50k15k75k20k100kJan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

Where the gas went

Since Nov 2024 the lease's gas goes to a transmission line instead of a processing plant

Flaring peaked at 4.1% of the gas in Jul 2025.

  • Processing plant (3)
  • Transmission line (2)
  • Lease fuel (1)
  • Flared (4)
Since Nov 2024 the lease's gas goes to a transmission line instead of a processing plantShare of RIO SAN MARCOS 36-45 UNIT 1A gas by disposition code each month, Aug 2023 to Jul 2026. Since Nov 2024 the lease's gas goes to a transmission line instead of a processing plant. Flaring peaked at 4.1% of the gas in Jul 2025.Share of the lease’s gas by disposition code, per month0%50%100%Nov 2024: plant to lineFlared 4.1%Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Since Nov 2024 the lease's gas goes to a transmission line instead of a processing plantShare of RIO SAN MARCOS 36-45 UNIT 1A gas by disposition code each month, Aug 2023 to Jul 2026. Since Nov 2024 the lease's gas goes to a transmission line instead of a processing plant. Flaring peaked at 4.1% of the gas in Jul 2025.Share of gas by disposition code0%50%100%Nov 24: plant to lineFlared 4.1%Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

  • Transmission line (2)

    98% · 735,677 mcf

  • Lease fuel (1)

    1.9% · 14,123 mcf

  • Flared (4)

    0.6% · 4,548 mcf

0.6% of the gas flared in the last 12 months. One month above 3%.

Who has run this lease

The operator changed once, most recently in Jan 2025

Operators of this lease over timeEndeavor Energy Resources L.P., Feb 2020 to Dec 2024; Diamondback E&P LLC, Jan 2025 to Jul 2026202120222023202420252026Changed Jan 2025Endeavor Energy Resources L.P.Feb 2020 to Dec 2024Diamondback E&P LLCJan 2025 to now
Operators of this lease over timeEndeavor Energy Resources L.P., Feb 2020 to Dec 2024; Diamondback E&P LLC, Jan 2025 to Jul 2026202120222023202420252026Changed Jan 2025Endeavor Energy Resources L.P.Feb 2020 to Dec 2024Diamondback E&P LLCJan 2025 to now

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

5 wells on this lease

Wells on RIO SAN MARCOS 36-45 UNIT 1A
API numberWell no.Status
42-329-43461125Active
42-329-43462134Active
42-329-43463135Active
42-329-43464143Shut-in
42-329-43465144Active

SourceTexas Railroad Commission Wellbore Query.

Buyers and gatherers

Companies named on the Form P-4, by product
CompanyProductRoleShare%FromUntil
Enlink Crude Marketing, LLCOilGathers50Aug 1, 2025–
Explore Logistics LLCOilGathers50Aug 1, 2025–
Enterprise M B Midstream LLCCasinghead gasBuys100Aug 1, 2025–
Enterprise Products Operating LLCCasinghead gasGathers100Aug 1, 2025–
Ent Navitas Mdstrm Mdlnd Bas LLCCasinghead gasGathers100Jun 1, 2023Aug 1, 2025
Ent Navitas Mdstrm Mdlnd Bas LLCCasinghead gasBuys100Jun 1, 2023Aug 1, 2025
Enlink Crude Marketing, LLCOilGathers100Jan 1, 2025Aug 1, 2025
Enlink Crude Marketing, LLCOilGathers50Jan 1, 2024Jan 1, 2025
Explore Logistics LLCOilGathers50Jan 1, 2024Jan 1, 2025
Enlink Crude Marketing, LLCOilGathers100Jun 1, 2023Jan 1, 2024

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

Who buys my oilOil price check

656.50 acres on the newest permit

Check your decimal on this lease
Permits for Rio San Marcos 36-45 Unit 1A
API numberWell no.Acreson the permit
42-329-43461125656.50
42-329-43462134656.50
42-329-43463135656.50
42-329-43464143656.50
42-329-43465144656.50

SourceRailroad Commission drilling permits, Oct 3, 2026 (source 1, source 2).

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What Diamondback Energy, Inc. told investors it received

Diamondback E&P LLC is linked to Diamondback Energy, Inc. (FANG).
Realized prices reported by Diamondback Energy, Inc.
QuarterOil$ per bblFiling
Q2 2026$96.82SEC filing
Q1 2026$73.47SEC filing
Q4 2025$58.00SEC filing
Q3 2025$64.60SEC filing
Q2 2025$63.23SEC filing
Q1 2025$70.95SEC filing

SourceDiamondback Energy, Inc. quarterly reports, SEC EDGAR, company-wide averages before hedging.

Estimate your royalty

36 months, newest first

Ledger for RIO SAN MARCOS 36-45 UNIT 1A
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 2026Diamondback E&P5,8675,76323,44722,4430$80.46$2.89
Jun 2026Diamondback E&P5,5445,65542,50441,66236$84.81$3.15
May 2026Diamondback E&P4,7704,4433,8953,2462$102.13$2.94
Apr 2026Diamondback E&P2,9292,83270,98570,270282$100.32$2.77
Mar 2026Diamondback E&P1,5641,66971,47771,0420$91.38$3.04
Feb 2026Diamondback E&P5,4645,24481,86780,4510$64.51$3.62
Jan 2026Diamondback E&P6,6736,89090,88989,2490$60.04$7.72
Dec 2025Diamondback E&P7,3827,26886,83185,03394$57.97$4.26
Nov 2025Diamondback E&P7,2267,19168,71667,2260$60.06$3.79
Oct 2025Diamondback E&P7,0228,51674,35572,80498$60.89$3.19
Sep 2025Diamondback E&P7,3686,08973,29069,5522,154$63.96$2.97
Aug 2025Diamondback E&P6,8866,71466,09262,6991,882$64.86$2.91
Jul 2025Diamondback E&P7,3797,81251,29548,3832,111$68.39$3.20
Jun 2025Diamondback E&P7,2236,94248,58446,5921,352$68.17$3.02
May 2025Diamondback E&P6,2706,27948,57847,89981$62.17$3.12
Apr 2025Diamondback E&P5,5345,33043,46242,9631$63.54$3.42
Mar 2025Diamondback E&P3,8933,81338,33037,9950$68.24$4.12
Feb 2025Diamondback E&P1,6121,50216,06115,678176$71.53$4.19
Jan 2025Diamondback E&P9131,0414,1332,7660$75.74$4.13
Dec 2024Endeavor Energy5,6775,79559,48455,822533$70.12$3.01
Nov 2024Endeavor Energy7,6307,65078,44975,15184$69.95$2.12
Oct 2024Endeavor Energy8,2458,14978,32175,3700$71.99$2.20
Sep 2024Endeavor Energy7,2727,68777,44573,588982$70.24$2.28
Aug 2024Endeavor Energy8,8028,42476,80773,7670$76.68$1.99
Jul 2024Endeavor Energy10,39410,28772,75169,985143$81.80$2.07
Jun 2024Endeavor Energy11,45811,61471,54768,102876$79.77$2.54
May 2024Endeavor Energy12,19712,36664,60461,123846$80.02$2.12
Apr 2024Endeavor Energy12,67212,85170,89668,0541$85.35$1.60
Mar 2024Endeavor Energy15,52715,49874,06970,895195$81.28$1.49
Feb 2024Endeavor Energy9,99810,39536,01133,109604$77.25$1.72
Jan 2024Endeavor Energy8,4397,72525,05422,029144$74.15$3.18
Dec 2023Endeavor Energy11,65111,81254,36050,283501$71.90$2.52
Nov 2023Endeavor Energy7,3237,05237,97434,32844$77.69$2.71
Oct 2023Endeavor Energy9,5959,77550,93047,18533$85.64$2.98
Sep 2023Endeavor Energy7,9797,94442,62435,66515$89.43$2.64
Aug 2023Endeavor Energy7,0597,02727,65620,01710$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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This lease belongs to

OperatorDiamondback E&P LLCFieldSpraberry (Trend Area) R 40 ExcCountyMidland County

Diamondback E&P LLC in Midland County

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Spraberry (Trend Area) R 40 Exc field

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