24/7 Wall St. | Bakken Formation Still Has 6 Billion Barrels of Oil 24/7 Wall St. How much recoverable oil does the Bakken Formation have? The most recent estimate of proved reserves is just under 6 billion barrels for the entire Williston Basin, which includes the Bakken, and another 3.5 billion to 4.1 billion barrels of ... How Harold Hamm Made, Lost, and Kept Billions in Oil Wealth Thanks to Oil Prices Oklahoma oil firms drilling but waiting to complete wells |