Most of the Bakken oil shale must be mined and heated at high temperatures retorted, separated, and collected. Or processed under ground by SAGH or THAI methdods. As far as I know there is no natural drive, or normal light sweet (or heavy) oil in any more than 1% of the play. That means the vast bulk must be produced $100 or more, not enough for a sustainable long-term investments. Sounds like a hit and run. Makes no sense.
Again talking with authority about something you have absolutely no idea about. The Bakken is not mined, you are confusing oil shale with oil in shale. The traditional view of oil shale up until the last few years has been solid kerogen in outcrops or near surface which would be mined. The terminology might be confusing but the Bakken is not like this, which you would know if you did a bit of reading. It is also not subject to SAGD or THAI which are used exclusively in heavy oil where you need to battle viscosity issues. The oil from shales like the Bakken is generally light and very low viscosity. The breakeven price for Eagleford liquids is the equivalent of $2.50 Mcf and Bakken slightly greater depending on where it is coming from. Anything north of $70/bbl on an oil basis is wildly economic for most of this stuff. The issue becomes where some of the liquids have higher fractions of butane and ethane than propanes or pentanes which aren't as profitable.
The Bakken, Eagleford, Duvernay, Nordegg and other oils/liquids from shales are recovered in exactly the same way shale gas is...numerous horizontal wells drilled from a single pad or groups of pads which are subjected to mult-stage fracs.
And there is a natural drive....gas expansion and over pressure. If there wasn't you would have a hard time producing any of these wells even with PCP or ESP pumping