MARY O
MARY O is a Texas oil lease in Upton County, Railroad Commission district 7C, operated by Summit Petroleum LLC. It has 5 wellbores on file with the Commission. Reported production runs from January 2013 to August 2026, totalling 309,006 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 $3.3M, with roughly $790K 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 975 barrels a month, about 195 per wellbore. Its strongest month on the record we hold was May 2016, at 4,825 barrels. In our own backtest, leases producing at this rate are forecast to within about 22% 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 MARY O
- Who operates MARY O?
- MARY O is operated by Summit Petroleum LLC, Railroad Commission of Texas operator number 829221.
- Where is MARY O?
- MARY O is a Texas oil lease in Upton County, Texas, in Railroad Commission district 7C. Its Railroad Commission lease number is 18246.
- Is MARY O still producing?
- MARY O is currently producing. The most recent month of production reported to the Railroad Commission of Texas for MARY O is August 2026.
- How much has MARY O produced?
- MARY O has reported 309,006 barrels of oil (bbl) to the Railroad Commission of Texas between January 2013 and August 2026, from 5 wellbores.
- How much is MARY O worth?
- The remaining production from MARY O is estimated to be worth about $3.3M in total as of 26 August 2026, within a range of $2.6M to $4.0M. That figure is the whole lease, undivided — not any one owner's share. A royalty interest in MARY O is a fraction of it. The estimate fits an Arps decline curve to the production MARY O has already reported, prices the remaining production at the current forward strip, and discounts it at 12% a year. The figure shown for MARY O is an estimate of value, not an offer and not an appraisal.
- How much income does MARY O generate in a year?
- MARY O is forecast to net about $790K across the whole undivided lease over the twelve months following 26 August 2026, before income tax. A royalty owner in MARY O receives a fraction of that, set by the decimal interest printed on their check stub.
Lease record
| Operator | Summit Petroleum LLC |
|---|---|
| Field | Spraberry (Trend Area) |
| County | Upton County, Texas |
| RRC district | 7C |
| Lease number | 18246 |
| Wellbores | 5 |
| Reported production | 309,006 bbl |
| First reported | |
| Last reported | |
| Estimated royalty value | $3.3M |
Where MARY O 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.