LEASES · O-1-15760 · OIL · DISTRICT 01
Heard Bower West Unit
ReportingMarathon Oil EF LLC · Atascosa County · Eagleville (Eagle Ford-1) field
Heard Bower West Unit is an RRC oil lease (O-1-15760) in Atascosa County operated by Marathon Oil EF LLC, with 9 wells completed on it.
It has reported 1.26M barrels of oil and 1.48M mcf of gas since September 2011, last reporting volume in April 2026 (statewide data runs through April 2026).
The last 12 reported months total 22K barrels of oil, up 12% on the year before; the lease peaked at 81.3K barrels in January 2014.
5 operators have filed production on it, most recently Marathon Oil EF LLC since November 2021.
- 1.26M
- bbl oil, all reported
- 1.48M
- mcf gas incl. casinghead
- 22K
- bbl oil, last 12 reported
- +12%
- vs the 12 before
- 9
- wells completed on it
- 81.3K
- peak month, bbl (Jan 2014)
PDQ LEASE REPORTS · FIRST SEP 2011 · LAST VOLUME APR 2026 · 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 21,987 · prior 12 19,548(+12%)
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 40,364 · prior 12 21,786(+85%)
Decline curve
A MODEL FITTED TO THE REPORTS, NOT A REPORT
An Arps hyperbolic curve fitted to the 76 reporting months of oil since the peak in Sep 2019. 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.
- 75%
- first-year decline from the peak (nominal Di 188%)
- 0.4
- b factor (hyperbolic)
- 0.90
- fit R²
- 29.6K
- 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 21,987 · prior 12 19,548(+12%)
Fitted hyperbolic curve from the Sep 2019 peak, dashed 24 months past the last report
| Projected month | Oct 2026 | Apr 2027 | Oct 2027 | Apr 2028 |
|---|---|---|---|---|
| On the curve, bbl per month | 423 | 366 | 319 | 280 |
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.
- Cinco Natural Resources Corp.Sep 2011 → Feb 2013 · 18 mo
- Aurora USA Development, LLCMar 2013 → May 2014 · 15 mo
- Baytex USA Development, LLCJun 2014 → Jun 2016 · 25 mo
- Teal Operating, LLCJul 2016 → Oct 2021 · 64 mo
- Marathon Oil EF LLCNov 2021 → Jul 2026 · 57 mo
Wells on the lease
FROM COMPLETION REPORTS · PRODUCTION ABOVE IS THEIR TOTAL
9
wells completed on the lease
- NO Type on File
- 4
- Producing
- 3
- Shut IN
- 2
Operates them now
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.
Developers: this page as JSON is GET /v1/data/leases/tx/o-1-15760, documented in the API reference.