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USGS finds NPRA to be more gas-prone

11/01/2010
Alan PetzetChief Editor-ExplorationThe US Geological Survey has sharply reduced its estimate of conventional, undiscovered oil in the National Petroleum Reserve-Alaska on Alaska's Central North Slope since the previous assessment in 2002.The latest estimate, released Oct. 26, is 896 million bbl of conventional, undiscovered oil and 53 tcf of conventional, undiscovered, nonassociated gas in the onshore reserve and in adjacent state waters.Recent exploratory drilling has revealed gas occurrence rather than oil in much of NPR-A. The survey's 2002 estimate was for 10.6 billion bbl of oil.Federal lease sales, 3D seismic surveys, and the drilling of more than 30 exploratory wells provided geolo...
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