Structure and kinematic analysis of the deepwater area of the Qiongdongnan Basin through a seismic interpretation and an
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Structure and kinematic analysis of the deepwater area of the Qiongdongnan Basin through a seismic interpretation and analogue modeling experiments SUN Zhen1*, WANG Zhenfeng2, SUN Zhipeng2, WANG Zhangwen3, ZHANG Wei2, HE Lijuan2 1 Key Laboratory of Chinese Academy of Sciences for Marginal Sea Geology, South China Sea Institute of Oceanology,
Chinese Academy of Sciences, Guangzhou 510301, China 2 Zhanjiang Branch of China National Offshore Oil Corporation Limited, Zhanjiang 524057, China 3 Shandong Province Geological Prospecting Institute, China Chemical Geology and Mine Bureau, Jinan 250013,
China Received 21 June 2014; accepted 28 September 2014 ©The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2015
Abstract
Located at the northwest continental slope of the South China Sea, the Qiongdongnan Basin bears valley-shaped bathymetry deepening toward east. It is separated from the Yinggehai Basin through NW-trending Indo-ChinaRed River shear zone, and connected with NW subsea basin through the Xisha Trough. Along with the rapid progress of the deepwater exploration, large amounts of high resolution geophysical and geological data were accumulated. Scientific researches about deepwater basins kept revealing brand new tectonic and sedimentary discoveries. In order to summarize the structural features and main controlling factors of the deepwater Qiongdongnan Basin, a series of researches on basin architecture, fault activities, tectonic deformation and evolution were carried out. In reference to analogue modeling experiments, a tectonic situation and a basin formation mechanism were discussed. The researches indicate that: the northern boundary of the Qiongdongnan Basin is strongly controlled by No. 2 fault. The overlapping control of two stress fields from the east and the west made the central depression zone extremely thinned. Combined with the changed stress field, the segmentation of a preexisting weakness zone made the sags in the east experiencing different rifting histories from the west ones. The NE-trending west segment of the Qiongdongnan Basin experienced strong rifting during Eocene, while the roughly EW-trending sags in the east segment show strong rifting during late Eocene and early Oligocene. Local structures such as NW-trending basal fault and inherited uplifts controlled the lateral segmentation. So first order factors such as regional stress field and preexisting weakness zone controlled the basin zonation, while the second order factors determined the segmentation from east to west. Key words: rifting structure, basin formation mechanism, profile interpretation, analogue modeling experiments, Qiongdongnan Basin Citation: Sun Zhen, Wang Zhenfeng, Sun Zhipeng, Wang Zhangwen, Zhang Wei, He Lijuan. 2015. Structure and kinematic analysis of the deepwater area of the Qiongdongnan Basin through a seismic interpretation and analogue modeling experiments. Acta Oceanologica Sinica, 34(4): 32–40, doi: 10.1007/s13131-015-0585-z
1 Introduction Along with billions of hydrocarbon discove
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