Lots of federal land in the Bakken area, BLM land, national grasslands and of course T Roosevelt National Park.
Last I heard, and this was within the past year, there was ONE drilling rig on federal ground.
That was just something I picked up in a business meeting, maybe outdated scuttlebutt by now, but the point remains that virtually nothing is taking place on federal land.
I have a hunch that is going to change.
There is lots of private land. That is why the drilling and production have been so successful.
First 60 - 90 Day Average Bakken Horizontal Production by Well {Map}
https://www.dmr.nd.gov/ndgs/Publication_List/pdf/GEO.INV/GI_149_36_Sept2012_FinalWeb.pdf