MCS FOUNDATION UNIT
RRC oil lease 21791, district 01 · EAGLEVILLE (EAGLE FORD-1) field · Atascosa County · operated by MARATHON OIL EF LLC
MCS FOUNDATION UNIT at a glance
It has no production a year earlier to compare with. Over the last 12 months it reported 384,325 BBL of oil and 437,213 MCF of gas. In May 2026, the latest month not marked provisional, it reported 20,194 BBL and 27,095 MCF.
Royalty = (20,194 BBL × $97.31 WTI, Sep 2026, EIA + 27,095 MCF × $2.95 Henry Hub, Sep 2026, EIA) × your decimal. 0.001 is only a placeholder: enter the decimal from your check stub or division order. Gross, before taxes and deductions. Full estimator →
Oil + condensate (BBL per month, last 36 months)
Gas (MCF per month, last 36 months)
Jun 2026 and Jul 2026 are provisional (lighter bars) and usually rise as late reports arrive.
MCS FOUNDATION UNIT production history in brief
By oil-equivalent volume over the last 12 months, MCS FOUNDATION UNIT ranks #5 of 1,245 reporting leases in Atascosa County. It reported production in 11 of the 34 non-provisional months shown, starting in our window in Jul 2025. Its peak oil month in that window was Aug 2025 at 83,580 BBL. The lease is in the EAGLEVILLE (EAGLE FORD-1) field and is operated by MARATHON OIL EF LLC; production is reported for the lease as a whole, not per well.
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New permits nearby
No new permits in this county in the current RRC daily file.
Monthly production
| Month | Oil (BBL) | Gas (MCF) |
|---|---|---|
| Jul 2026 (provisional) | 13,411 | 19,778 |
| Jun 2026 (provisional) | 15,423 | 14,405 |
| May 2026 | 20,194 | 27,095 |
| Apr 2026 | 18,897 | 24,629 |
| Mar 2026 | 22,183 | 32,491 |
| Feb 2026 | 21,504 | 31,552 |
| Jan 2026 | 25,942 | 34,042 |
| Dec 2025 | 30,606 | 36,375 |
| Nov 2025 | 35,463 | 45,765 |
| Oct 2025 | 44,432 | 48,517 |
| Sep 2025 | 52,690 | 51,508 |
| Aug 2025 | 83,580 | 71,056 |
| Jul 2025 | 48,718 | 37,185 |
Check these figures in the RRC Production Data Query (Specific Lease Query: district 01, lease 21791). Production is reported per lease, so a lease with several wells is not split by well.
Source: Texas Railroad Commission (data sets, Production Data Query). Data date: RRC Production Data Query dump, extract dated Sep 18, 2026; production through Jul 2026. Jun 2026 and Jul 2026 are provisional: operators file late and amend, so these months usually rise in later releases. Oil = crude oil + condensate (BBL); gas = gas-well gas + casinghead gas (MCF), as reported to RRC. Methodology.