The estimate lends credence to Pioneer Natural Resources Co. Chief Executive Officer Scott Sheffield’s assertion that the Permian’s shale endowment could hold as much as 75 billion barrels, making it second only to Saudi Arabia’s Ghawar field. Pioneer has been increasing its production targets all year as drilling in the Wolfcamp produced bigger gushers than the Irving, Texas-based company’s engineers and geologists forecast.
Although the Permian has been gushing crude since the 1920s, its multiple layers of oil-soaked shale remained largely untapped until the last several years, when intensive drilling and fracturing techniques perfected in other U.S. Shale regions were adopted. The Wolfcamp, which is as much as a mile (1.6 kilometers) thick in some places, has been one of the primary targets of shale drillers.
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