Abstract
The total drilling in eastern and northwestern Colorado and western Nebraska declined from 979 wells in 1965 to 779 wells in 1966. This decrease of 20.5% was caused by a sharp decline in exploratory and development drilling in central and western Nebraska, and indicates lack of success in extending production northward in the Nebraska panhandle and along the Cambridge arch. Exploratory drilling declined by 76 wells in Nebraska and by 52 wells in Colorado; development drilling increased by 32 wells in Colorado and decreased by 104 wells in Nebraska. Discoveries in northwestern Colorado from reservoirs of Cretaceous age and southeastern Colorado from reservoirs of Mississippian and Pennsylvanian ages should lead to increased exploratory work. The Denver basin activity shoul continue at about the same level, whereas central Nebraska drilling activity may increase with the discovery of oil in Reagan Sandstone northwest of Sleepy Hollow. Geophysical activity will probably increase in northwestern Colorado in search of structural trends in the Dakota and in southeastern Colorado in search of structural trends in the Mississippian.
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