Drillers in Utah and Colorado are poking into a massive shale deposit trying to find a way to unlock oil reserves that are so vast they would swamp OPEC.
A recent report by the U.S. Government Accountability Office estimated that if half of the oil bound up in the rock of the Green River Formation could be recovered it would be "equal to the entire world's proven oil reserves."
Both the GAO and private industry estimate the amount of oil recoverable to be 3 trillion barrels.
"In the past 100 years — in all of human history -- we have consumed 1 trillion barrels of oil. There are several times that much here," said Roger Day, vice president for operations for American Shale Oil (AMSO).
The Green River drilling is beginning as shale mining is booming in the U.S. and a report by the International Energy Agency predicts that the U.S. will become the world's largest oil producer by 2020. That flood of oil can have major implications for the U.S. economy as well as the country's foreign policy which has been based on a growing scarcity of oil.