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The success of Bakken and Three Forks wells in Saskatchewan and Manitoba indicates that this activity may extend 50-100 miles east and north of historical producing areas.
The Bakken Formation has three informal members, an upper and a lower black, organic-rich shale, separated by an arenaceous limestone to siltstone.
Bakken crude oil gravity ranges from 36 to 44 degrees API. The quality of this oil is excellent, almost identical to WTI. The benchmark crude oil is West Texas Intermediate, which is 40 degrees API sweet crude. It is the benchmark because it requires the least amount of processing in a modern refinery to make the most valuable products, unleaded gasoline and diesel fuel.
The distance into the formation a fracture stimulation extends depends on the mechanical properties of the rock as well as the rate, pressure, and physical properties of the fracturing fluid. The typical current Bakken fracture stimulation creates cracks that may be as long as 1,000-1,200 feet.
The Bakken formation thickness varies from about 11 feet at the erosional edge, or subcrop, to about 180 feet just east of Tioga at the depositional center.