MAMMOTH CREEK (TONKAWA), District 10, Texas
A field is the Railroad Commission's unit of geology and of regulation. Its spacing rule is what decides how many wells an acreage can hold.
Our estimate: volumes the operator filed with the Commission, valued at the EIA first-purchase price for that month. It is not a payment anyone received, and it is not a royalty. It sums the 21 leases in this field that have a page here — 66% of the register's 32 — so it understates the field.
Production, 2025
The Railroad Commission's Oil and Gas Annual Report for 2025, its most recent. These are the state's figures for the whole field, not ours.
| Wells | In the field | Producing | Produced in 2025 | Also produced | Cumulative |
|---|---|---|---|---|---|
| Oil | 0 | 0 | 0 bbl | 0 mcfcasinghead | 900,981 bblsince discovery |
| Gas | 4 | 2 | 28,042 mcf | 154 bblcondensate | 8,054,408 mcfsince 1970 |
The discovery well's oil measured 49.0° API gravity, perforated at 6,616 ft.
Spacing rule
What the Commission requires of a well on this field.
| Wells | Rule | Effective | From the lease line | Between wells | Acres per unit | Max diagonal |
|---|---|---|---|---|---|---|
| Gas | B | 1994-12-05 | 660 ft | 1,320 ft | 640 | 9,000 ft |
| Gas | O | 1994-12-05 | 660 ft | 1,320 ft | 160 | 4,500 ft |
| Oil | B | — | 660 ft | 1,320 ft | 80 | 3,250 ft |
Commission remarks: AOF-1 AND AOF-2 EFFECTIVE 4/1/96.
County
Leases in this field
Every lease here files this field's number with the Commission and has a page on this site.
Field number 57019830, from the Railroad Commission's field register. The register's own index resolves 32 leases and 41 wells to this field by name, over every lease in Texas rather than only those with a page here. It resolves a lease by NAME and refuses an ambiguous one, so it counts nothing for a field that shares its name with another — which is why the lease count above comes from the field number instead.