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Assessment of Undiscovered Conventional Oil and Gas Resources of Six Geologic Provinces of China, 2011 Using a geology-based assessment methodology, the U.S. Geological Survey estimated mean volumes of undiscovered conventional petroleum resources in six geologic provinces of China at 14.9 billion barrels of oil, 87.6 trillion cubic feet of natural gas, and 1.4 billion barrels of natural-gas liquids. Introduction The U.S. Geological Survey (USGS) assessed the potential for undiscovered conventional oil and gas resources in six geologic provinces of China: Junggar Basin, Bohaiwan Basin, Ordos Basin, Sichuan Basin, Songliao Basin, and Tarim Basin (fig. 1). Each province was divided into 1–4 assessment units (AU), for a total of 13 AUs (table 1).

Assessment of undiscovered conventional oil and gas resources of six geologic provinces of China