LEASES · O-2-12193 · OIL · DISTRICT 02
Challenger AC Unit A
ReportingMarathon Oil EF LLC · Karnes County · Sugarkane (Austin Chalk) field
Challenger AC Unit A is an RRC oil lease (O-2-12193) in Karnes County operated by Marathon Oil EF LLC, with 2 wells completed on it.
It has reported 549K barrels of oil and 1.45M mcf of gas since June 2021, last reporting volume in April 2026 (statewide data runs through April 2026).
The last 12 reported months total 37.9K barrels of oil, down 9% on the year before; the lease peaked at 74.3K barrels in September 2021.
- 549K
- bbl oil, all reported
- 1.45M
- mcf gas incl. casinghead
- 37.9K
- bbl oil, last 12 reported
- -9%
- vs the 12 before
- 2
- wells completed on it
- 74.3K
- peak month, bbl (Sep 2021)
PDQ LEASE REPORTS · FIRST JUN 2021 · 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 37,886 · prior 12 41,635(-9%)
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 123,274 · prior 12 148,971(-17%)
Decline curve
A MODEL FITTED TO THE REPORTS, NOT A REPORT
An Arps hyperbolic curve fitted to the 56 reporting months of oil since the peak in Sep 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.
- 80%
- first-year decline from the peak (nominal Di 432%)
- 1.1
- b factor (hyperbolic)
- 0.81
- fit R²
- 416K
- 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 37,886 · prior 12 41,635(-9%)
Fitted hyperbolic curve from the Sep 2021 peak, dashed 24 months past the last report
| Projected month | Oct 2026 | Apr 2027 | Oct 2027 | Apr 2028 |
|---|---|---|---|---|
| On the curve, bbl per month | 2,426 | 2,234 | 2,072 | 1,933 |
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 LLCJun 2021 → Jul 2026 · 62 mo
Wells on the lease
FROM COMPLETION REPORTS · PRODUCTION ABOVE IS THEIR TOTAL
2
wells completed on the lease
- Producing
- 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-2-12193, documented in the API reference.