Recoverable Oil In The Bakken, Estimates -- September 26, 2019

The USGS survey, 2013, recoverable oil:

• top line: 11.4 billion bbls
• mean: 7.4 billion bbls 

CLR, August 28, 2019, recoverable oil:

• 30 to 40 billion bbls
• "4 to 5 times the official USGS estimate"

At 2 million bopd:

• 7.4 million bbls: 3,700 days or 10+ years
• 40 billion bbls: 20,000 days or 55 years