G. Alan Petzet Exploration Editor Land and state waters of the U.S. contain technically recoverable volumes of 112.6 billion bbl of oil and 1,073.8 tcf of conventional and unconventional gas, the U.S. Geological Survey estimated. The figures include proved reserves, expected future additions to reserves in existing fields, and undiscovered resources (Table 1) (31684 bytes). Donald L. Gautier of Denver, project chief for the USGS study, called the volumes "astonishing." The oil figure is 44% higher than the USGS assessed in its last study, released in 1989. The assessed 715 tcf of technically recoverable conventional gas rese...

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