A new government study released today estimates that the amount of recoverable oil in the Bakken Formation in North Dakota, South Dakota and Montana (see map above) – at 7.4 billion barrels – is more than twice the previous estimate of 3.65 billion barrels from a 2008 study.
The United States Geological Survey (USGS) today released an updated oil and gas resource assessment for the Bakken Formation and a new assessment for the Three Forks Formation in North Dakota, South Dakota and Montana. The assessments found that the formations contain an estimated mean of 7.4 billion barrels (BBO) of undiscovered, technically recoverable oil. The updated assessment for the Bakken and Three Forks represents a twofold increase over what has previously been thought.
The USGS assessment found that the Bakken Formation has an estimated mean oil resource of 3.65 BBO and the Three Forks Formation has an estimated mean resource of 3.73 BBO, for a total of 7.38 BBO, with a range of 4.42 (95 percent chance) to 11.43 BBO (5 percent chance). This assessment of both formations represents a significant increase over the estimated mean resource of 3.65 billion barrels of undiscovered oil in the Bakken Formation that was estimated in the 2008 assessment.
“These world-class formations contain even more energy resource potential than previously understood, which is important information as we continue to reduce our nation’s dependence on foreign sources of oil,” said Secretary of the Interior Sally Jewell. “We must develop our domestic energy resources armed with the best available science, and this unbiased, objective information will help private, nonprofit and government decision makers at all levels make informed decisions about the responsible development of these resources.”
Since the 2008 USGS assessment, more than 4,000 wells have been drilled in the Williston Basin, providing updated subsurface geologic data. Previously, very little data existed on the Three Forks Formation and it was generally thought to be unproductive. However, new drilling resulted in a new understanding of the reservoir and its resource potential.
Note: Harold Hamm, CEO of Continental Resources and a pioneer in horizontal drilling and hydraulic fracturing, estimates that there are actually 24 billion barrels of recoverable oil in the Bakken Formation, an estimate partly based on the assumption that drilling technologies will continue to improve.