BISMARCK, N.D. - The government estimated Thursday that up to 4.3 billion barrels of oil can be recovered from the Bakken shale formation in North Dakota and Montana, using current technology.
The U.S. Geological Survey called it the largest continuous oil accumulation it has ever assessed.
The Bakken Formation encompasses some 25,000 square miles in North Dakota, Montana, Saskatchewan and Manitoba. About two-thirds of the acreage is in western North Dakota, where the oil is trapped in a thin layer of dense rock nearly two miles beneath the surface. Companies use pressurized fluid and sand to break pores in the rock and prop them open to recover the oil....
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