G. Alan Petzet Exploration Editor Caution and careful planning are the watchwords for operators in their approach to horizontal drilling for oil in Upper Cretaceous Niobrara chalk in Colorado and Wyoming. Despite its geologic age equivalence with the Austin chalk of southeastern Texas, the formation has not attracted the same degree of attention or yielded as stunning results as the Austin chalk. Niobrara "deserves a measured approach on the basis of general considerations," says a new Frontiers series publication by Petroleum Information Corp., Denver. "Little is yet known about the precise reasons for its sp...

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