Mesaverde Group sandstone units in 13 closely-spaced wells in the central and southern Piceance Basin of Colorado were correlated utilizing wireline log response quantitatively and qualitatively. Based on these correlations, the environmental subdivisions of the Mesaverde Group were characterized as follows. Paralic (upper mixed-marine) zone, occurring in the uppermost Mesaverde, includes thick sandstone units which are interpreted to be regionally continuous. Fluvial zone, containing point-bars 20 to 30+ ft thick, is interpreted to be correlatable to a maximum of 6800 ft. Paludal zone, which has insufficient data to adequately characterize the sand units. However, 63 percent of the units are correlatable across at least 139 ft. An approximation of the dimensional characteristics of Mesaverde sandstone units has potential applications in designing hydraulic fracturing treatments and estimating gas reserves more accurately. 16 figures, 2 tables

This report is a summary of drilling and testing activities in the four primary study areas of the WGSP: Greater Green River Basin, Northern Great Plains Province, Uinta Basin, and Piceance Basin. (DLC)

This report summarizes November, 1979, progress of the government-sponsored projects directed toward increasing gas production from the low-permeability gas sands of the western United States. Coring was completed in the Pacific Transmission Supply Company No. 3-10A Federal well in the Greater Green River Basin, and in the Mapco Rio Blanco Unit No. 11-17F well, Uinta Basin. Projects of the National Laboratories and Energy Technology Centers progressed on schedule in November. Interruptions and shutdowns still plagued the Colorado Interstate Gas Company Miller No. 1 and Sprague No. 1 wells. Gas Producing Enterprises, Inc. Natural Buttes Unit wells continued to flow to sales. All testing has been completed at Mitchell Energy Corporation Muse-Duke No. 1 well.