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The U.S. Geological Survey (USGS) completed an assessment of undiscovered, technically recoverable continuous oil and gas resources in the Bohaiwan Basin (or Bohai Bay Basin) Province (fig. 1), the most prolific petroleum province in China. The basin is a composite of grabens, half-grabens, tilted fault blocks, and horsts within which sedimentary rocks range in age from Cambrian to Neogene (Mao and others, 2017). The complex tectonic history of the Bohaiwan Basin Province affected the development of petroleum systems (Allen and others, 1998; Ryder and others, 2011; Liang and others, 2016; Mao and others, 2017). Two major petroleum systems are related to the tectonic history. Coals of the late Carboniferous–Permian are known sources of gas in the deep subbasins (Huang and others, 2010), whereas Paleogene lacustrine shales are known sources of oil and gas and are the major petroleum source rocks in the basin (Jiang and others, 2016; He and others, 2017).

Assessment of undiscovered continuous oil and gas resources in the Bohaiwan Basin Province, China, 2017