The USGS did an initial study back in 1999 that estimated 400 billion recoverable barrels were present but with prices bottoming out at $10 a barrel back then the report was dismissed because of the higher cost of horizontal drilling techniques that would be needed, estimated at $20-$40 a barrel.
It was not until 2007, when EOG Resources of Texas started a frenzy when they drilled a single well in Parshal N.D. that is expected to yield 700,000 barrels of oil that real excitement and money started to flow in North Dakota. Marathon Oil is investing $1.5 billion and drilling 300 new wells in what is expected to be one of the greatest booms in Oil discovery since Oil was discovered in Saudi Arabia in 1938. […]
…could cut the cost of oil in half in the long run.
Radley found that. His commenters came up with more links to other sources if you want to "drill down," ha ha.