USA Today has an article on the 10 most oil-rich states: "The U.S. energy industry is booming. As new technologies make oil easier and more affordable to extract, the United States is poised to become the world's leading oil producer as soon as 2015, according to a 2013 study by the International Energy Agency. At the same time, proven oil reserves — the estimated quantities of oil that can be extracted under existing conditions — have also risen. In 2012, the U.S. had more than 30.5 billion barrels of proven oil reserves, up 15% from the year before."
Not surprising - Texas and North Dakota top the list. Read it all.