Philip A. Schenewerk
Enserch Exploration, Inc., Oklahoma City, Oklahoma
Darshan K. Sethi and Walter H. Fertl
Dresser Atlas, Houston, Texas
M. Lochmann
Dresser Atlas, Oklahoma City, Oklahoma
ABSTRACT
Granite wash reservoirs in the Texas Panhandle, in New Mexico and in parts of southern Oklahoma and Colorado have produced substantial quantities of oil and gas. By the drilling of new wells, these reservoirs continue to be actively explored. Furthermore, many old and already cased boreholes are being re-evaluated and recompleted.
In this complex reservoir rock, application of natural gamma ray spectral logging has been found to successfully evaluate reservoir shaliness despite the presence of other radioactive minerals.
The present discussion describes reservoir characteristics of the granite wash, presents novel interpretive concepts, and illustrates the latter on several field case studies.