Troy A. Cook Timothy R. Klett Richard M. Pollastro Christopher J. Schenk Michael E. Brownfield 2009 Using a geology-based assessment methodology, the U.S. Geological Survey estimated mean volumes of 2.2 trillion cubic feet (TCF) of undiscovered natural gas and 15 million barrels of oil (MMBO) in the Western Oregon and Washington Province. More than 67 percent, or 1.5 TCF, of the undiscovered natural gas is continuous gas estimated to be coalbed gas in Tertiary coals in western Oregon and Washington. application/pdf 10.3133/fs20093060 en U.S. Geological Survey Assessment of Undiscovered Hydrocarbon Resources of the Western Oregon and Washington Province reports