Paleogene Tectonic Evolution Controls on Sequence Stratigraphic Patterns in the Central Part of Deepwater Area of Qiongdongnan Basin, Northern South China Sea  

作　　者：Guangzeng Song Hua Wang Huajun Gan Zhipeng Sun Xiaolong Liu Meng Xu Jinfeng Ren Ming Sun Di Sun 

机构地区：[1]Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences [2]Faculty of Earth Resources, China University of Geosciences [3]Research Institute of China National Offshore Oil Corporation Ltd.-Zhanjiang [4]Research Institute of China National Offshore Oil Corporation Ltd. [5]Shandong Province Experimental Institute of Geological Sciences, Key Laboratory of Gold Mineralization Process and Resources Utilization, Ministry of Land and Resources [6]Petroleum Development Centre, Shengli Oilfield Company, SINOPEC

出　　处：《Journal of Earth Science》2014年第2期275-288,共14页地球科学学刊（英文版）

基　　金：supported by the National Science Foundation of China (NSFC) (Nos. 41272122, 41202074 and 41172123);the Major National Science and Technology Programs in the "Twelfth Five-Year" Plan of China (No. 2011ZX05009-002-02);the Open Research Program Foundation of Teaching Laboratory of China University of Geosciences;the Foundation of Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences) of Ministry of Education (No. TPR-2013-14)

摘　　要：In active rift basins, tectonism is extremely important for sequence stratigraphic patterns, affecting both the sequence architecture and internal makeup. Sequence stratigraphic framework of a Paleogene rift succession in Qiongdongnan Basin, northern South China Sea, was built using seismic profiles, complemented by well logs and cores. One first-order and three second-order sequences were identified on the basis of basin-scale unconformities, and seven third-order sequences are defined by unconformities along the basin margins and correlative conformities within the central basin. Through unconformity analysis and backstripping procedure, the Paleogene synrift tectonic evolution of deep- water area of Qiongdongnan Basin was proved to be episodic, which can be divided into rifting stage-I, rifting stage-II and rifting stage-III. Episodic rifting resulted in the formation of various types of struc- tural slope break belts, which controlled different architectures and internal makeup of sequences. This study enhances the understanding of the control of tectonic evolution on sequence stratigraphic pat- terns and establishes relevant patterns in a typical rift basin, and further proposes the favorable sand- stone reservoirs developing in different sequence stratigraphic patterns, which will be pretty helpful for subtle pool exploration in deepwater area of petroliferous basins.In active rift basins, tectonism is extremely important for sequence stratigraphic patterns, affecting both the sequence architecture and internal makeup. Sequence stratigraphic framework of a Paleogene rift succession in Qiongdongnan Basin, northern South China Sea, was built using seismic profiles, complemented by well logs and cores. One first-order and three second-order sequences were identified on the basis of basin-scale unconformities, and seven third-order sequences are defined by unconformities along the basin margins and correlative conformities within the central basin. Through unconformity analysis and backstripping procedure, the Paleogene synrift tectonic evolution of deep- water area of Qiongdongnan Basin was proved to be episodic, which can be divided into rifting stage-I, rifting stage-II and rifting stage-III. Episodic rifting resulted in the formation of various types of struc- tural slope break belts, which controlled different architectures and internal makeup of sequences. This study enhances the understanding of the control of tectonic evolution on sequence stratigraphic pat- terns and establishes relevant patterns in a typical rift basin, and further proposes the favorable sand- stone reservoirs developing in different sequence stratigraphic patterns, which will be pretty helpful for subtle pool exploration in deepwater area of petroliferous basins.

关 键 词：South China Sea deepwater area tectonic evolution structural slope break belt se-quence stratigraphic pattern. 

分 类 号：P618.13[天文地球—矿床学]