LEASES · O-1-20396 · OIL · DISTRICT 01
74-Atascosa SA 3
ReportingMarathon Oil EF LLC · Atascosa County · Eagleville (Eagle Ford-1) field
74-Atascosa SA 3 is an RRC oil lease (O-1-20396) in Atascosa County operated by Marathon Oil EF LLC, with one well completed on it.
It has reported 253K barrels of oil and 373K mcf of gas since March 2021, last reporting volume in September 2025 (statewide data runs through April 2026).
The last 12 reported months total 11.9K barrels of oil, down 52% on the year before; the lease peaked at 30.4K barrels in August 2021.
- 253K
- bbl oil, all reported
- 373K
- mcf gas incl. casinghead
- 11.9K
- bbl oil, last 12 reported
- -52%
- vs the 12 before
- 1
- wells completed on it
- 30.4K
- peak month, bbl (Aug 2021)
PDQ LEASE REPORTS · FIRST MAR 2021 · LAST VOLUME SEP 2025 · STATEWIDE DATA THROUGH APR 2026
Oil by month
Barrels reported on Form PR for the whole lease. The latest months are revised upward as late reports arrive.
Last 12 months 11,857 · prior 12 24,760(-52%)
Gas by month
Gas-well gas plus casinghead gas, mcf. On an oil lease all gas is reported as casinghead. The latest months are revised upward as late reports arrive.
Last 12 months 19,111 · prior 12 36,474(-48%)
Decline curve
A MODEL FITTED TO THE REPORTS, NOT A REPORT
An Arps hyperbolic curve fitted to the 50 reporting months of oil since the peak in Aug 2021. The dashed line below is that curve, drawn over the months it was fitted to and then 24 months past the last report; where it parts from the columns is where the model stops describing the lease. It describes the trend of past reports. It does not know about recompletions, shut-ins, or new wells, and it is shown only when the lease reported within the last year and the curve explains most of the history.
- 83%
- first-year decline from the peak (nominal Di 480%)
- 1.0
- b factor (hyperbolic)
- 0.98
- fit R²
- 176K
- bbl remaining on the curve, to 1 per month
Oil, barrels reported months since the peak, with the fitted curve and its projection
Last 12 months 11,857 · prior 12 24,760(-52%)
Fitted hyperbolic curve from the Aug 2021 peak, dashed 24 months past the last report
| Projected month | Jul 2026 | Jan 2027 | Jul 2027 | Jan 2028 |
|---|---|---|---|---|
| On the curve, bbl per month | 1,157 | 1,054 | 968 | 895 |
Quoting a projected figure as if it were reported would be wrong; the reported figures are the ones in the charts and the table view. How production is reported →
Who reported it
Each run of months one operator filed the production report, oldest first.
- Marathon Oil EF LLCMar 2021 → Jan 2026 · 59 mo
Wells on the lease
FROM COMPLETION REPORTS · PRODUCTION ABOVE IS THEIR TOTAL
1
wells completed on the lease
- Not on Schedule
- 1
Operates them now
Newest permits
- 01335824 #3HJan 15, 2021
About this data
Monthly oil, gas, and casinghead from the RRC PDQ production dump, which lags the reporting month by two to three months; figures shown through Apr 2026. Wells from completion reports; operator runs from who filed each month's report.
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