MARY K. SHIRK
MARY K. SHIRK is a Texas oil lease in Upton County, Railroad Commission district 7C, operated by Opal Resources Operating Co.,LLC. It has 2 wellbores on file with the Commission. Reported production runs from August 2011 to August 2026, totalling 74,738 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 $1.3M, with roughly $405K 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 228 barrels a month, about 114 per wellbore. Its strongest month on the record we hold was June 2016, at 632 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 K. SHIRK
- Who operates MARY K. SHIRK?
- MARY K. SHIRK is operated by Opal Resources Operating Co.,LLC, Railroad Commission of Texas operator number 624735.
- Where is MARY K. SHIRK?
- MARY K. SHIRK is a Texas oil lease in Upton County, Texas, in Railroad Commission district 7C. Its Railroad Commission lease number is 17651.
- Is MARY K. SHIRK still producing?
- MARY K. SHIRK is currently producing. The most recent month of production reported to the Railroad Commission of Texas for MARY K. SHIRK is August 2026.
- How much has MARY K. SHIRK produced?
- MARY K. SHIRK has reported 74,738 barrels of oil (bbl) to the Railroad Commission of Texas between August 2011 and August 2026, from 2 wellbores.
- How much is MARY K. SHIRK worth?
- The remaining production from MARY K. SHIRK is estimated to be worth about $1.3M in total as of 27 August 2026, within a range of $1.0M to $1.6M. That figure is the whole lease, undivided — not any one owner's share. A royalty interest in MARY K. SHIRK is a fraction of it. The estimate fits an Arps decline curve to the production MARY K. SHIRK has already reported, prices the remaining production at the current forward strip, and discounts it at 12% a year. The figure shown for MARY K. SHIRK is an estimate of value, not an offer and not an appraisal.
- How much income does MARY K. SHIRK generate in a year?
- MARY K. SHIRK is forecast to net about $405K across the whole undivided lease over the twelve months following 27 August 2026, before income tax. A royalty owner in MARY K. SHIRK receives a fraction of that, set by the decimal interest printed on their check stub.
Lease record
| Operator | Opal Resources Operating Co.,LLC |
|---|---|
| Field | Spraberry (Trend Area) |
| County | Upton County, Texas |
| RRC district | 7C |
| Lease number | 17651 |
| Wellbores | 2 |
| Reported production | 74,738 bbl |
| First reported | |
| Last reported | |
| Estimated royalty value | $1.3M |
Where MARY K. SHIRK 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.