Christopher J. Schenk Craig J. Wandrey Ronald R. Charpentier Michael E. Brownfield Janet K. Pitman Richard M. Pollastro Troy A. Cook Marilyn E. Tennyson T. R. Klett 2012 Using a geology-based assessment methodology, the U.S. Geological Survey estimated volumes of undiscovered, technically recoverable, conventional petroleum resources for the southern Siberian craton provinces of Russia. The mean volumes were estimated at 3.0 billion barrels of crude oil, 63.3 trillion cubic feet of natural gas, and 1.2 billion barrels of natural gas liquids. application/pdf 10.3133/fs20113155 en U.S. Geological Survey Assessment of undiscovered oil and gas resources of the southern Siberian craton (Baykit High, Nepa--Botuoba High, Angara--Lena Terrace, and Cis--Patom Foredeep Provinces), Russia, 2011 reports