Abstract
Drilling activity in eastern and northwestern Colorado was down dramatically in 1989 with 678 wells drilled in the area, a 26% decrease in drilling from 922 wells in 1988. Forty percent of the total, or 270 wells, were exploratory tests with a success rate of 19%, slightly less than the 20% success rate in 1988. Activity in eastern Colorado focused on the Pennsylvanian Morrow along the Las Animas arch and the Cretaceous D and J sandstones in the Denver basin. Exploration targets in the northwestern portion of the state were primarily Cretaceous and Pennsylvanian.
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