Sedimentary characteristics and evolution of transitional belt of the Paleogene Lingshui Formation in Ya13-1 Gasfield of Qiongdongnan Basin, South China Sea
Zhao Dongna1,2, Zhu Xiaomin1,2, Lin Jincheng3, Dong Yanlei1,2, Yang Chaoqiang4,Wang Qingshuai4
1 State Key Laboratory of Petroleum Resource and Prospecting，China University of Petroleum(Beijing)，Beijing 102249;
2 College of Geosciences，China University of Petroleum(Beijing)，Beijing 102249;
3 Shanghai Branch of CNOOC Ltd.，Shanghai 021648;
4 Zhanjiang Branch of CNOOC Ltd.，Zhanjiang 524057，Guangdong
Fluvial-marine transitional facies, including braided river delta and estuary-tide flat, were mainly developed in sags of Qiongdongnan Basin，northern South China Sea. Under the guide of high-resolution sequence stratigraphy theory，the Members 2 and 3 of Paleogene Lingshui Formation were divided into 2 long-term base-level cycles and 10 mid-term base-level cycles. Sedimentary characteristics and evolution of the Members 2 and 3 of Lingshui Formation were discussed under isochronous stratigraphic framework. Braided river delta, with unique stratification structures, rich mud lamina and abundant trace fossils, was mainly developed in the Member 3 of Lingshui Formation, and its evolutionary process could be divided into 3 stages: the early period dominated by fluvial activities(S1-S4)，the middle period affected by fluvial and tidal activities(S5-S6), and the late period dominated by tidal activities(S7-S8). During the depositional period of Member 2 of Lingshui Formation(S9-S10)，a comprehensive transgression happened in study area, resulted in more complicated sedimentary characteristics and process with more unique biogenic structures, which was interpreted as estuary-tide flat. According to this research，the relative sea level change was the controlling factor of base-level cycle and sedimentary evolution in Qiongdongnan Basin.
Corresponding Authors:
Zhu Xiaomin，born in 1960，is a professor in College of Geosciences，China University of Petroleum(Beijing). His research interests include sequence stratigraphy，sedimentary geology，reservoir geology and seismic sedimentology. E-mail: xmzhu@cup.edu.cn
E-mail: 2011311021@student.cup.edu.cn
About author: Zhao Dongna，born in 1985，is a candidate for Ph D. degree in China University of Petroleum(Beijing). Now she is mainly engaged in sequence stratigraphy and seismic sedimentology. E-mail: 2011311021@student.cup.edu.cn
Cite this article:
Zhao Dongna,Zhu Xiaomin,Lin Jincheng et al. Sedimentary characteristics and evolution of transitional belt of the Paleogene Lingshui Formation in Ya13-1 Gasfield of Qiongdongnan Basin, South China Sea[J]. JOPC, 2014, 16(3): 385-400.
Zhao Dongna,Zhu Xiaomin,Lin Jincheng et al. Sedimentary characteristics and evolution of transitional belt of the Paleogene Lingshui Formation in Ya13-1 Gasfield of Qiongdongnan Basin, South China Sea[J]. JOPC, 2014, 16(3): 385-400.
