LEASES · O-1-17741 · OIL · DISTRICT 01
Guajillo East
ReportingMarathon Oil EF LLC · Atascosa County · Eagleville (Eagle Ford-1) field
Guajillo East is an RRC oil lease (O-1-17741) in Atascosa County operated by Marathon Oil EF LLC, with 61 wells completed on it.
It has reported 10.9M barrels of oil and 14.6M mcf of gas since March 2014, last reporting volume in April 2026 (statewide data runs through April 2026).
The last 12 reported months total 193K barrels of oil, down 39% on the year before; the lease peaked at 329K barrels in April 2015.
- 10.9M
- bbl oil, all reported
- 14.6M
- mcf gas incl. casinghead
- 193K
- bbl oil, last 12 reported
- -39%
- vs the 12 before
- 61
- wells completed on it
- 329K
- peak month, bbl (Apr 2015)
PDQ LEASE REPORTS · FIRST MAR 2014 · 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 192,543 · prior 12 317,175(-39%)
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 274,310 · prior 12 537,477(-49%)
Decline curve
A MODEL FITTED TO THE REPORTS, NOT A REPORT
An Arps hyperbolic curve fitted to the 87 reporting months of oil since the peak in Feb 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.
- 58%
- first-year decline from the peak (nominal Di 130%)
- 0.9
- b factor (hyperbolic)
- 0.85
- fit R²
- 2.55M
- 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 192,543 · prior 12 317,175(-39%)
Fitted hyperbolic curve from the Feb 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 | 13,964 | 13,106 | 12,344 | 11,661 |
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 2014 → Jul 2026 · 149 mo
Wells on the lease
FROM COMPLETION REPORTS · PRODUCTION ABOVE IS THEIR TOTAL
61
wells completed on the lease
- Producing
- 32
- Injection
- 12
- Shut IN
- 10
- NO Type on File
- 7
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-1-17741, documented in the API reference.