From OilShaleGas.com, link:...

From OilShaleGas.com,
link: http://oilshalegas.com/bakkenshale.html
worth reading 4th & 5th paragraphs

This link has a lot of information so suggest its worthwhile reading if you wish to find out more on Canadian Shale exploration sites

And a summary of drilling in Bakken region by Bakkenstocks.com
There has been quite a bit of activity since our last review of the active drilling rig report 4 months ago. The number of rigs is up to 121 which represents a 20% increase since March. Continental Resources (CLR: 43.15 +2.20%) has really stepped up their drilling activity and now has 17 drilling rigs versus the 11 they had in March. EOG (EOG: 95.16 +1.14%) has kept the number of rigs it has in operation constant at 13 and Whiting Petroleum [WLL] has increased from 9 to 11. With the well publicized PR issue offshore drilling now has due to the BP Gulf fiasco, the Bakken region may actually be viewed as a flight to quality and potentially less risky as offshore counterparts.