HALFF "18"
HALFF "18" is a Texas oil lease in Upton County, Railroad Commission district 7C, operated by Marathon Oil Company. It has 1 wellbore on file with the Commission. Reported production runs from January 1993 to August 2026, totalling 60,985 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 $505K, with roughly $84K 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 82 barrels a month. Its strongest month on the record we hold was December 2016, at 229 barrels. In our own backtest, leases producing at this rate are forecast to within about 45% 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 HALFF "18"
- Who operates HALFF "18"?
- HALFF "18" is operated by Marathon Oil Company, Railroad Commission of Texas operator number 525380.
- Where is HALFF "18"?
- HALFF "18" is a Texas oil lease in Upton County, Texas, in Railroad Commission district 7C. Its Railroad Commission lease number is 12366.
- Is HALFF "18" still producing?
- HALFF "18" is currently producing. The most recent month of production reported to the Railroad Commission of Texas for HALFF "18" is August 2026.
- How much has HALFF "18" produced?
- HALFF "18" has reported 60,985 barrels of oil (bbl) to the Railroad Commission of Texas between January 1993 and August 2026, from 1 wellbore.
- How much is HALFF "18" worth?
- The remaining production from HALFF "18" is estimated to be worth about $505K in total as of 26 August 2026, within a range of $278K to $732K. That figure is the whole lease, undivided — not any one owner's share. A royalty interest in HALFF "18" is a fraction of it. The estimate fits an Arps decline curve to the production HALFF "18" has already reported, prices the remaining production at the current forward strip, and discounts it at 12% a year. The figure shown for HALFF "18" is an estimate of value, not an offer and not an appraisal.
- How much income does HALFF "18" generate in a year?
- HALFF "18" is forecast to net about $84K across the whole undivided lease over the twelve months following 26 August 2026, before income tax. A royalty owner in HALFF "18" receives a fraction of that, set by the decimal interest printed on their check stub.
Lease record
| Operator | Marathon Oil Company |
|---|---|
| Field | King Mountain, Se. (Bend) |
| County | Upton County, Texas |
| RRC district | 7C |
| Lease number | 12366 |
| Wellbores | 1 |
| Reported production | 60,985 bbl |
| First reported | |
| Last reported | |
| Estimated royalty value | $505K |
Where HALFF "18" 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.