Brockton-Froid Fault Line

I recently saw a presentation from Continental Oil and their map indicated that oil drilling would end east of the Brockton-Froid fault line. It was told to me that a fault line stops the oil. But I noticed that the field in Canada is west of the same fault line.

Do the drilling companies have plans to eventually lease and drill between the Brockton-Froid fault line and the Poplar fault line west of Williston?

I have attached the location of the presentation below:

http://www.bmda.org/enews/?ID=164

On the map it indicates that they are not interested in anything west of the Brockton-Froid fault line. I know that it has been an issue for companies dealing with the reservation. How do they manage to work with the Three Affiliated Tribes? They must have the same long process as Ft. Peck in dealing with the BIA. Or did they streamline their processes and Ft. Peck did not?

I guess my question really is: Aside from the problems dealing on reservation land, do they even think there is oil west of that fault line? Or does it cut off at the fault line? If there is oil, I would imagine eventually they will get to it.