Basic characteristics of oil and gas basins in China
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Oil and gas-bearing basins in China are grouped into three types: the tensional, compressional and transitional. The first type is dominant in the east, with the Songliao and the Bohai Gulf basin as its representative; the second in the west, exemplified by the Tarim and Junggar basins; and the last in central China, represented by the Sichuan and Ordos basins. These petroliferous provinces are polycyclic superimposed and composite basins, with complex traps of various origins and megastructural oil-gas belts.