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Basic geology of Baiyun deep-water area in the northern South China Sea

Pang Xiong1 Chen Changmin1 Peng Dajun2Zhou Di3 Shao Lei4 He Min1 Liu Baojun1(1.Shenzhen Branch of CNOOC Ltd.,Guangzhou,510240;2.Chengdu University of Technology,Chengdu,610059;3.South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou,510301;4.Tongji University,Shanghai,200092)  
Baiyun deep-water area is quite complex and unique in geology.There is a particular setting of tectonic evolution because it was located in a Mesozoic tectonic weak zone of subduction and a Cenozoic tectonic transfer zone between a thinned crust of oceanic-continental transition and a basin tectonics.After a depositional evolution history of "rifting,fault-sagging and sagging",a three-level framework of basins was formed in the area.Since Oligocene,a continuous subsidence due to the spreading of South China Sea has resulted in stepped transgression sea level changes contrary to the global relative change of sea level and a generally fining-upward depositional sequence.During Oligocene,Baiyun area was a continental shelf,with delta sediments developed.After a major tectonic event at the latest Oligocene(about 23.8 Ma),Baiyun area changed into a deep slope where the large dee-water fan system of Pearl River formed.All these geologic conditions have undoubtedly control and affect tectonic evolution,depositional filling and hydrocarbon accumulation in the area.Therefore,collect knowledge of the basic geology in Baiyun area may be helpful to oil and gas exploration in deep-water areas.
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