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Controls of Plate Motions on Subsidence and Filled Characteristics of the Cenozoic in Chinese Offshore Basins

LI Yun-zhen1,2,DEN Yun-hua3,XU Qiang1,YU Xing-he2(1.Research Center,CNOOC,Beijing 100027,China;2.School of Energy Resources,China University of Geosciences,Beijing 100083,China;3.China National Offshore Oil Corporation,Beijing 100010,China)  
The evolutions of the Pacific Plate,the Indian Ocean Plate and the Eurasian Plate have the controlling effect to the subsidence and filled characteristics of the Cenozoic in Chinese offshore basins.According to the characteristics of mantle convection and crustal stretching,the subsidence types of Chinese offshore basins can be divided into passive,initiative and combination thermal subsidences.The different subsidence types of sedimentation basins have different basin structures.Rift is the main type in the passive thermal subsidence.Depression is the main type in the initiative thermal subsidence.Vertical or lateral overlapping is the main type in the combination thermal subsidence.The passive thermal subsidence is the main type in northern Chinese offshore basins in internal plates.As away from the sea,these basins are less affected by the transgression which is dominated by the continental sedimentary system.Central Chinese offshore basins in plate margins have the subsidence characteristics which the initiative overlaps the passive in a lateral direction with shallow water,small slope break and delta.Southern Chinese offshore basins in plate margins also have the subsidence characteristics which the initiative overlaps the passive in a lateral direction with deeper water,large slope break and delta.
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