Actually, the most optimistic estimates by a geoligist named Price put it at 500 billion barrels with 50% of that being recoverable. Others are more conservative in their estimates. A USGS survey is due next year which could help clarify it.
I work for an agchem company and we have locations in North Dakota and eastern Montana. We can’t begin to hire truck drivers to deliver our products.....everyboy’s gone to the oil patch.