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Texas oil lease

Producing

MARK & SANDRA UNIT

Mark & Sandra Unit is an oil lease in Zavala County, Texas, operated by Atlas Operating LLC in the Briscoe Ranch (Eagleford) field.

2 wells

4,526bbl oil, last 12 months−27% vs prior year
Operator
Atlas Operating LLC
County
Zavala County
Field
Briscoe Ranch (Eagleford)
RRC lease
01-16060

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Where it sits

This county

Zavala CountyZavalaUvaldeKinneyMedinaFrioMaverickZavala County
Zavala County
Oil in Jul 2026
319 bbl
Reporting since
Jan 2020

Production by month

Oil output fell 27% over the last 12 months

  • Oil (bars)
  • Last 12 months
Oil output fell 27% over the last 12 monthsMonthly oil production for MARK & SANDRA UNIT, Aug 2023 to Jul 2026. Oil output fell 27% over the last 12 months. 4,526 bbl in the 12 months through Jul 2026, against 6,160 bbl in the 12 months before.Last 12 months: 4,526 bblbbl per month02505007501,000Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output fell 27% over the last 12 monthsMonthly oil production for MARK & SANDRA UNIT, Aug 2023 to Jul 2026. Oil output fell 27% over the last 12 months. 4,526 bbl in the 12 months through Jul 2026, against 6,160 bbl in the 12 months before.Last 12 monthsbbl per month02505007501,000Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

Where the gas went

No gas disposition reported for this lease

The operator has not reported where the gas went in the months we hold.

Who has run this lease

The operator changed 2 times, most recently in Apr 2021

Operators of this lease over timeSanchez Oil & Gas Corporation, Jan 2020 to Dec 2020; Catarina Midstream, LLC, Jan 2021 to Mar 2021; Atlas Operating LLC, Apr 2021 to Jul 20262020202120222023202420252026Changed Jan 2021Changed Apr 2021Sanchez Oil & Gas CorporationJan 2020 to Dec 2020Catarina Midstream, LLCJan 2021 to Mar 2021Atlas Operating LLCApr 2021 to now
Operators of this lease over timeSanchez Oil & Gas Corporation, Jan 2020 to Dec 2020; Catarina Midstream, LLC, Jan 2021 to Mar 2021; Atlas Operating LLC, Apr 2021 to Jul 20262020202120222023202420252026Changed Jan 2021Changed Apr 2021Sanchez Oil & Gas CorporationJan 2020 to Dec 2020Catarina Midstream, LLCJan 2021 to Mar 2021Atlas Operating LLCApr 2021 to now

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

2 wells on this lease

Wells on MARK & SANDRA UNIT
API numberWell no.Status
42-507-329002HShut-in
42-507-329433HShut-in

SourceTexas Railroad Commission Wellbore Query.

Buyers and gatherers

Companies named on the Form P-4, by product
CompanyProductRoleShare%FromUntil
Plains Marketing, L.p.OilGathers90Feb 1, 2026–
Shell Trading (Us) CompanyOilGathers10Feb 1, 2026–
Eastex Crude Company, LLCOilGathers60Jan 1, 2023Feb 1, 2026
Shell Trading (Us) CompanyOilGathers20Jan 1, 2021Feb 1, 2026
Trafigura Trading LLCOilGathers20Jan 1, 2021Feb 1, 2026
Eastex Crude CompanyOilGathers60Jan 1, 2021Jan 1, 2023
Eastex Crude CompanyOilGathers30Apr 1, 2020Jan 1, 2021
Shell Trading (Us) CompanyOilGathers30Apr 1, 2020Jan 1, 2021

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

Who buys my oilOil price check

643.04 acres on the newest permit

Permits for Mark & Sandra Unit
API numberWell no.Acreson the permit
42-507-329433H643.04
42-507-329002H652.23

SourceRailroad Commission drilling permits, Sep 26, 2026 (source 1, source 2).

Unit decimal checker

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36 months, newest first

Ledger for MARK & SANDRA UNIT
MonthOil producedbblOil soldbblWTI$/bblHenry Hub$/MMBtu
Jul 2026Atlas Operating319443$80.46$2.89
Jun 2026Atlas Operating208168$84.81$3.15
May 2026Atlas Operating452437$102.13$2.94
Apr 2026Atlas Operating567761$100.32$2.77
Mar 2026Atlas Operating395173$91.38$3.04
Feb 2026Atlas Operating415481$64.51$3.62
Jan 2026Atlas Operating283318$60.04$7.72
Dec 2025Atlas Operating341178$57.97$4.26
Nov 2025Atlas Operating313343$60.06$3.79
Oct 2025Atlas Operating342287$60.89$3.19
Sep 2025Atlas Operating413563$63.96$2.97
Aug 2025Atlas Operating478440$64.86$2.91
Jul 2025Atlas Operating360253$68.39$3.20
Jun 2025Atlas Operating371484$68.17$3.02
May 2025Atlas Operating470536$62.17$3.12
Apr 2025Atlas Operating777632$63.54$3.42
Mar 2025Atlas Operating496633$68.24$4.12
Feb 2025Atlas Operating548623$71.53$4.19
Jan 2025Atlas Operating415756$75.74$4.13
Dec 2024Atlas Operating364564$70.12$3.01
Nov 2024Atlas Operating505675$69.95$2.12
Oct 2024Atlas Operating669662$71.99$2.20
Sep 2024Atlas Operating625664$70.24$2.28
Aug 2024Atlas Operating560500$76.68$1.99
Jul 2024Atlas Operating415746$81.80$2.07
Jun 2024Atlas Operating841614$79.77$2.54
May 2024Atlas Operating690648$80.02$2.12
Apr 2024Atlas Operating669830$85.35$1.60
Mar 2024Atlas Operating573655$81.28$1.49
Feb 2024Atlas Operating783659$77.25$1.72
Jan 2024Atlas Operating366325$74.15$3.18
Dec 2023Atlas Operating737670$71.90$2.52
Nov 2023Atlas Operating7031,050$77.69$2.71
Oct 2023Atlas Operating867822$85.64$2.98
Sep 2023Atlas Operating625506$89.43$2.64
Aug 2023Atlas Operating783662$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

OperatorAtlas Operating LLCFieldBriscoe Ranch (Eagleford)CountyZavala County

Atlas Operating LLC in Zavala County

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Briscoe Ranch (Eagleford) field

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