Colorado and Utah have as much oil as Saudi Arabia, Iran, Iraq, Venezuela, Nigeria, Kuwait, Libya, Angola, Algeria, Indonesia, Qatar and the United Arab Emirates combined.
That's not science fiction. Trapped in limestone up to 200 feet (61 meters) thick in the two Rocky Mountain states is enough so-called shale oil to rival OPEC and supply the U.S. for a century.
Exxon Mobil Corp. and Chevron Corp., the two biggest U.S. energy companies, and Royal Dutch Shell Plc are spending $100 million a year testing new methods to separate the oil from the stone for as little as $30 a barrel. A growing number of industry executives and analysts say new technology and persistently high prices make the idea feasible.