A reader sends this very, very interesting link -- using gas (CO2 or methane) injection to increase recovery of oil from the upper, lower, and middle Bakken rock.
The link: http://www.business.nd.gov/uploads/14/april102014empowerndcommissionminutes.pdf
It's a PDF link and it may take a few minutes to download.
After reading the four pertinent slides at the link, this will make more sense: when one is talking about a reservoir with 903 billion bbls of original oil in place (OOIP), a one-percent increase in production equates to 9 billion bbls of additional recoverable oil.
As a reminder, the USGS estimates there is about 7.6 billion bbls of recoverable oil from the Bakken/upper Three Forks using current technology, completion methods, and strategies. That was back in 2010, I believe.
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