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Texas oil lease

Producing

RIO SAN MARCOS 36-45 UNIT 1

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

13 wells

60,845bbl oil, last 12 months−8% vs prior year
Operator
Diamondback E&P LLC
County
Midland County
Field
Spraberry (Trend Area)
RRC lease
08-48945

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Where it sits

This county

Midland CountyMidlandMartinAndrewsGlasscockHowardEctorMidland County
Midland County
Gas, last 12 months
1,058,657 mcf
Oil in Jul 2026
5,665 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.

See why checks stop on this lease

Production by month

Oil output fell 8% over the last 12 months

  • Oil (bars)
  • Gas (line)
  • Last 12 months
Oil output fell 8% over the last 12 monthsMonthly oil production and gas for RIO SAN MARCOS 36-45 UNIT 1, Aug 2023 to Jul 2026. Oil output fell 8% over the last 12 months. 60,845 bbl in the 12 months through Jul 2026, against 66,290 bbl in the 12 months before.Last 12 months: 60,845 bblbbl per monthmcf per month002,00050k4,000100k6,000150k8,000200k10k250kOct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output fell 8% over the last 12 monthsMonthly oil production and gas for RIO SAN MARCOS 36-45 UNIT 1, Aug 2023 to Jul 2026. Oil output fell 8% over the last 12 months. 60,845 bbl in the 12 months through Jul 2026, against 66,290 bbl in the 12 months before.Last 12 monthsbbl per monthmcf per month002,00050k4,000100k6,000150k8,000200k10k250kJan 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 11.9% of the gas in Jan 2024.

  • 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 1 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 11.9% of the gas in Jan 2024.Share of the lease’s gas by disposition code, per month0%50%100%Nov 2024: plant to lineFlared 11.9%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 1 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 11.9% of the gas in Jan 2024.Share of gas by disposition code0%50%100%Nov 24: plant to lineFlared 11.9%Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

  • Transmission line (2)

    96% · 1,017,609 mcf

  • Lease fuel (1)

    3.0% · 32,056 mcf

  • Flared (4)

    0.8% · 8,992 mcf

0.8% of the gas flared in the last 12 months. 4 months 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., Jan 2020 to Dec 2024; Diamondback E&P LLC, Jan 2025 to Jul 20262020202120222023202420252026Changed Jan 2025Endeavor Energy Resources L.P.Jan 2020 to Dec 2024Diamondback E&P LLCJan 2025 to now
Operators of this lease over timeEndeavor Energy Resources L.P., Jan 2020 to Dec 2024; Diamondback E&P LLC, Jan 2025 to Jul 20262020202120222023202420252026Changed Jan 2025Endeavor Energy Resources L.P.Jan 2020 to Dec 2024Diamondback E&P LLCJan 2025 to now

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

13 wells on this lease

Wells on RIO SAN MARCOS 36-45 UNIT 1
API numberWell no.Status
42-329-41824212Active
42-329-41839211Active
42-329-41840221Active
42-329-41841222Active
42-329-41842223Active
42-329-41843224Active
42-329-41933231Active
42-329-41934232Active
42-329-41952241Active
42-329-41958242Shut-in
42-329-41960233Active
42-329-41977211RActive
42-329-42323242RActive

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, LLCOilGathers100Sep 5, 2017Jan 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

  • Good to know

    A pooling certificate (P-12) was filed

    Your tract may share its production with neighbors in a pooled unit. The unit acres the operator uses to divide production can differ from the acreage on one permit.

  • Good to know

    13 wells are listed on this lease

    Each well can have its own unit. The decimal for one well does not have to equal the decimal for another.

Check your decimal on this lease
Permits for Rio San Marcos 36-45 Unit 1
API numberWell no.Acreson the permit
42-329-42323242R656.50
42-329-41977211R656.50
42-329-41952241656.50
42-329-41958242656.50
42-329-41960233656.50
42-329-41933231656.50
42-329-41934232656.50
42-329-41841222656.50
42-329-41842223656.50
42-329-41843224656.50
42-329-41839211656.50
42-329-41840221656.50

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

Unit decimal checker

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 1
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 2026Diamondback E&P5,6655,692121,335118,3446$80.46$2.89
Jun 2026Diamondback E&P5,6075,51685,61882,82541$84.81$3.15
May 2026Diamondback E&P3,9713,94664,67961,794168$102.13$2.94
Apr 2026Diamondback E&P4,5364,54833,91431,72617$100.32$2.77
Mar 2026Diamondback E&P4,0964,10326,76125,37127$91.38$3.04
Feb 2026Diamondback E&P4,5054,62640,40537,55015$64.51$3.62
Jan 2026Diamondback E&P4,2144,37585,08482,266174$60.04$7.72
Dec 2025Diamondback E&P6,0626,688140,596136,1740$57.97$4.26
Nov 2025Diamondback E&P6,7015,670140,984137,597570$60.06$3.79
Oct 2025Diamondback E&P5,2345,95391,71090,117301$60.89$3.19
Sep 2025Diamondback E&P4,4633,90399,97490,7856,347$63.96$2.97
Aug 2025Diamondback E&P5,7915,579127,597123,0601,326$64.86$2.91
Jul 2025Diamondback E&P5,4975,628230,721223,4715,618$68.39$3.20
Jun 2025Diamondback E&P5,3165,325156,142150,6074,057$68.17$3.02
May 2025Diamondback E&P5,4635,43786,68184,323905$62.17$3.12
Apr 2025Diamondback E&P5,4735,85370,85369,47772$63.54$3.42
Mar 2025Diamondback E&P4,7434,21799,85397,1401,685$68.24$4.12
Feb 2025Diamondback E&P3,5393,28969,12666,6091,357$71.53$4.19
Jan 2025Diamondback E&P1,6601,80421,93917,95212$75.74$4.13
Dec 2024Endeavor Energy5,3325,558104,84794,804440$70.12$3.01
Nov 2024Endeavor Energy7,1117,020143,940134,63912$69.95$2.12
Oct 2024Endeavor Energy7,1947,146162,636152,44190$71.99$2.20
Sep 2024Endeavor Energy7,2057,460156,159144,3492,038$70.24$2.28
Aug 2024Endeavor Energy7,7577,725173,834163,865190$76.68$1.99
Jul 2024Endeavor Energy7,6117,517171,142162,516439$81.80$2.07
Jun 2024Endeavor Energy7,2697,280147,752138,2151,080$79.77$2.54
May 2024Endeavor Energy6,1716,216127,492117,2142,900$80.02$2.12
Apr 2024Endeavor Energy7,4277,730147,826131,5916,684$85.35$1.60
Mar 2024Endeavor Energy8,9208,703148,823133,5645,560$81.28$1.49
Feb 2024Endeavor Energy8,9228,933152,265137,5124,466$77.25$1.72
Jan 2024Endeavor Energy7,8387,913138,958114,89216,598$74.15$3.18
Dec 2023Endeavor Energy8,8888,901173,198163,805282$71.90$2.52
Nov 2023Endeavor Energy9,8469,640179,346167,1452,717$77.69$2.71
Oct 2023Endeavor Energy9,4399,745162,682153,033615$85.64$2.98
Sep 2023Endeavor Energy8,4108,152158,204137,1962,181$89.43$2.64
Aug 2023Endeavor Energy8,3698,517183,148171,739872$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)CountyMidland County

Diamondback E&P LLC in Midland County

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Spraberry (Trend Area) field

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