SHOT: Permian’s Wolfcamp formation called biggest shale oil field in U.S. “The estimate lends credence to the assertion from Pioneer Natural Resources CEO Scott Sheffield that the Permian’s shale could hold as much as 75 billion barrels, making it second only to Saudi Arabia’s Ghawar field. Irving-based Pioneer has been increasing its production targets all year as drilling in the Wolfcamp produced bigger gushers than the company’s engineers and geologists forecast.”
