pinch-out Geol.
[f. vbl. phr. to pinch out s.v. pinch v. 14.]
A narrowing of a stratum, vein, or other body of rock to the point of extinction.
| 1928 in Funk's Stand. Dict. 1941 Bull. Amer. Assoc. Petroleum Geologists XXV. 1258 A pinch-out of a reservoir sand on a structural nose would..be considered a stratigraphic trap of a less perfect type. 1962 Courier-Mail (Brisbane) 15 Dec. 9/3 Seismic surveys had outlined a large closed structure which also had good stratigraphic pinch-out possibilities. 1974 P. L. Moore et al. Drilling Practices Manual xii. 300 These permeability barriers may be faults, folds, salt domes, or permeability pinchouts. |