LEASES · O-2-11299 · OIL · DISTRICT 02
Guajillo East AC
Marathon Oil EF LLC · Atascosa County · Sugarkane (Austin Chalk) field
Guajillo East AC is an RRC oil lease (O-2-11299) in Atascosa County operated by Marathon Oil EF LLC, with one well completed on it.
It has reported 206K barrels of oil and 375K mcf of gas since January 2015, last reporting volume in February 2026 (statewide data runs through April 2026).
It reported 5.52K barrels of oil in the 12 months through April 2026, down 64% on the year before; the lease peaked at 14K barrels in January 2015.
- 206K
- bbl oil, all reported
- 375K
- mcf gas incl. casinghead
- 5.52K
- bbl oil, 12 months through Apr 2026
- -64%
- vs the 12 before
- 1
- wells completed on it
- 14K
- peak month, bbl (Jan 2015)
PDQ LEASE REPORTS · FIRST JAN 2015 · LAST VOLUME FEB 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.
12 months through Apr 2026 5,516 · prior 12 15,482(-64%)
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.
12 months through Apr 2026 9,362 · prior 12 35,630(-74%)
Decline curve
None shown. Petrora fits an Arps curve only when the last ten years of oil reports follow one decline closely enough to project (R² of 0.7 or better over at least a year since the peak). This lease's recent history does not, so a projection would be a guess dressed as a number.
Who reported it
Each run of months one operator filed the production report, oldest first.
- Marathon Oil EF LLCJan 2015 → Jul 2026 · 139 mo
Wells on the lease
FROM COMPLETION REPORTS · PRODUCTION ABOVE IS THEIR TOTAL
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-2-11299, documented in the API reference.