Accumulated Mechanisms for Different Genetic Types of Non-biological CO2 and Controlling Factors in North Marginal Basins, South China Sea
Received date: 2011-08-02
Revised date: 2011-12-06
Online published: 2011-12-10
There is plenty of non-biological CO2 in the north marginal basins of South China Sea. Based on patterns of gas origins and classified parameters (i.e. δ13C CO2 ,3He/4He) as well as specific geological conditions of gas migration and accumulation, two types of CO2 sources are classified into crustal-type CO2 or mixing of crust-mantle mixed type CO2 controlled by both muddy diapiric thermal fluid, and mantle-type CO2 acted by mantle-derived volcanic activity and deep fault. The crustal-type and mixing of crust-mantle type CO2 is widely distributed. After the complex processes of migration and accumulation, this type of CO2 is mainly clustered in the shallow layer of central muddy diapirs zone in the strike-slip extensional brim of northwest Yingge Sea basin, which is characterized as partition block in plane and multi-layer and zone in vertical. So, the crustal-type and mixing of crust-mantle type CO2 accumulation is controlled by muddy diapir intrusion activity and physical-chemical combined action about thick marine calcium sand-shale. Few amount of mantle-type CO2 is developed in the Ⅱfault zone and it's surrounding of eastern Qiongdongnan basin. The mantle-type CO2 accumulation is mainly controlled by mantle-derived volcanic activity and deep fault.
HE Jia-Xiong, ZHU You-Hai, HUANG Xia, GONG Xiao-Feng . Accumulated Mechanisms for Different Genetic Types of Non-biological CO2 and Controlling Factors in North Marginal Basins, South China Sea[J]. Natural Gas Geoscience, 2011 , 22(6) : 935 -942 . DOI: 10.11764/j.issn.1672-1926.2011.06.935
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