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Oh, about half billion dollars, according to Chevron’s latest action.

http://oilandglory.foreignpolicy.com/

Big Oil was born in Pennsylvania, and a growing number of the industry's major players seem convinced that its future is there, too -- specifically, in the natural gas deposits of the Marcellus Shale formation. The latest evidence? Chevron just dropped $4.3 billion on it. The company is acquiring Atlas Energy, a Pittsburgh-based independent producer that has an estimated 9 trillion cubic feet of gas to its name in the region, which geologists think may contain at least 262 trillion cubic feet of recoverable gas.