John McCaslin Exploration Editor Horizontal well economics make the Mississippian Bakken formation, once a bailout zone for wells aimed for Devonian and Ordovician zones, a primary exploration goal in the Williston basin. A horizontal well's cost of nearly double that of a vertical well is more than offset by a doubling of reserves and a fivefold increase in initial Potential test, based on data for Bicentennial field. Last November the scoreboard for horizontal wells drilled to the Bakken

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