COMPLEXITY CAUSES EXPLANATION AND CHARACTERISTICS ANALYSIS OF OIL AND GAS DISTRIBUTION IN THE SEDIMENTARY BASINS OF CHINA

From 9 aspects, the complexities of Chinese sedimentary basins are discussed, including: 1)large quantity, small size, wide distribution; 2)multiplicity in basin types, with geodynamic setting widely changed; 3)poly-stage basin superimposition and basin composition; 4)terrestrial sedimentary basin being dominant; 5)large quantity and intense activity of faults; 6)strong post-stage rebuilding; 7)frequent magmatic activity; 8)high speed sedimentary, with deposition center migrating with time; 9)asymmetry in geothermal fields. The complexity causes of Chinese sedimentary basin are analyzed, and it is pointed out that, complicated plate tectonic situation and evolution history are the fundamental reasons. Finally, the unusual characteristics of oil and gas distribution in Chinese sedimentary basins are briefly discussed.