Analysis: Middle Three Forks Bench Holds Vast Untapped Oil Potential / Latest / By mark Williston Basin operators have mostly landed laterals in the shallower upper Three Forks bench. But the deeper middle Three Forks contains hundreds of millions of barrels of oil yet to be recovered, North Dakota state researchers report. Share this: Click to share on Facebook (Opens in new window) Facebook Click to share on X (Opens in new window) X Related