SPAHN-MIKKELSON UNIT
SPAHN-MIKKELSON UNIT is a Texas oil lease in Karnes County, Railroad Commission district 02, operated by Marathon Oil Ef LLC. It has 4 wellbores on file with the Commission. Reported production runs from May 2012 to August 2026, totalling 1,010,902 barrels. The lease is currently producing. Fitting a decline curve to that history and pricing the remaining production at today's forward curve values the whole lease — a 100% undivided interest — at about $6.3M, with roughly $1.4M expected over the next twelve months. An individual royalty owner receives their own decimal interest times that figure. Over the last twelve months on file it averaged 2,281 barrels a month, about 570 per wellbore. Its strongest month on the record we hold was November 2019, at 94,400 barrels. In our own backtest, leases producing at this rate are forecast to within about 17% of what they went on to produce, and that measured error is the range shown on the page rather than a confidence of our own devising.
Key facts about SPAHN-MIKKELSON UNIT
- Who operates SPAHN-MIKKELSON UNIT?
- SPAHN-MIKKELSON UNIT is operated by Marathon Oil Ef LLC, Railroad Commission of Texas operator number 525398.
- Where is SPAHN-MIKKELSON UNIT?
- SPAHN-MIKKELSON UNIT is a Texas oil lease in Karnes County, Texas, in Railroad Commission district 02. Its Railroad Commission lease number is 10060.
- Is SPAHN-MIKKELSON UNIT still producing?
- SPAHN-MIKKELSON UNIT is currently producing. The most recent month of production reported to the Railroad Commission of Texas for SPAHN-MIKKELSON UNIT is August 2026.
- How much has SPAHN-MIKKELSON UNIT produced?
- SPAHN-MIKKELSON UNIT has reported 1,010,902 barrels of oil (bbl) to the Railroad Commission of Texas between May 2012 and August 2026, from 4 wellbores.
- How much is SPAHN-MIKKELSON UNIT worth?
- The remaining production from SPAHN-MIKKELSON UNIT is estimated to be worth about $6.3M in total as of 27 August 2026, within a range of $5.3M to $7.4M. That figure is the whole lease, undivided — not any one owner's share. A royalty interest in SPAHN-MIKKELSON UNIT is a fraction of it. The estimate fits an Arps decline curve to the production SPAHN-MIKKELSON UNIT has already reported, prices the remaining production at the current forward strip, and discounts it at 12% a year. The figure shown for SPAHN-MIKKELSON UNIT is an estimate of value, not an offer and not an appraisal.
- How much income does SPAHN-MIKKELSON UNIT generate in a year?
- SPAHN-MIKKELSON UNIT is forecast to net about $1.4M across the whole undivided lease over the twelve months following 27 August 2026, before income tax. A royalty owner in SPAHN-MIKKELSON UNIT receives a fraction of that, set by the decimal interest printed on their check stub.
Lease record
| Operator | Marathon Oil Ef LLC |
|---|---|
| Field | Eagleville (Eagle Ford-2) |
| County | Karnes County, Texas |
| RRC district | 02 |
| Lease number | 10060 |
| Wellbores | 4 |
| Reported production | 1,010,902 bbl |
| First reported | |
| Last reported | |
| Estimated royalty value | $6.3M |
Where SPAHN-MIKKELSON UNIT sits
Source: Railroad Commission of Texas lease production records, complete through . Figures on this page were computed on .
Production figures are as reported to the Railroad Commission of Texas. The value shown is an estimate produced by fitting a decline curve to that reported history; it is not an offer or an appraisal. How this estimate is calculated.