Sedimentary types and features of gravity flow depositional systems from Late Oligocene to Early Miocene in Liwan sag, Pearl River Mouth Basin
Xing Zuo-Chang1, 2, Zhang Zhong-Tao3, Lin Chang-Song4, Zhang Bo3, Hong Fang-Hao2, Gong Yue2
1. Beijing Research Institute of Uranium Geology, Beijing100029, China; 2. School of Energy Resources, China University of Geosciences, Beijing100083, China; 3. Research Institute of Shenzhen Branch, CNOOC, Shenzhen518000, China; 4. School of Ocean Sciences, China University of Geosciences, Beijing100083, China
Abstract The sedimentary characteristics of gravity flow depositional systems(GFDS)in Liwan sag,Pearl River Mouth Basin,has not been clear. Based on a large number of high-revolution seismic data and a small amount of borehole data,the sedimentary types,spatial-temporal evolution,and controlling factors of the gravity flow depositional systems in Zhuhai Formation and the basal Zhujiang Formation in the Liwan sag are summarized. Four sedimentary types of the GFDS,can be identified according to the different seismic facies associations. Pordelta turbidite fan,the first type,is relatively small-scale compared with other type,but formed at the same time with the shelf edge delta,which is likely to be sand rich. Mass transport complex deposition,the second type,is featured by fault scarps,multiple small detachment faults,internal deformation structures such as sliding and compression,and overall southeast movement. The channelized slope fan,the third type,with lots of small channels on the head,contains microfacies such as turbidite channel,channel-levee complex and crevasse splay. The basin floor fan,the fourth type,is a bidirectionally down-lapped,mound-shaped and strong amplitude continuous intermediate-frequency reflection seismic facie association,and its microfacies such as incised valley,channel filling,front crevasse fan and sheet like lobe can be recognized. It is believed that the coupling of tectonics,climate,sea level change and sediment supply results in the GFDS in the study area and different types of GFDS are formed at different period during the base level cycle change. This research can provide a reference for the summary of gravity flow depositional law and hydrocarbon exploration in the ultra-deep water area.
Fund:Co￣funded by Nuclear Energy Development Project on Songliao Basin (No. [2017]1403) and the National Natural Science Foundation of China(Nos.91328201,91528301)
Corresponding Authors:
Lin Chang-Song,born in 1958,is a professor and Ph.D. supervisor. He is mainly engaged in researches on basin analysis and sedimentology. E-mail: lincs@cugb.edu.cn.
About author: Xing Zuo-Chang,born in 1988,is a doctor and an engineer. He is mainly engaged in research on sedimentology. E-mail: xzcxing@163.com.
Cite this article:
Xing Zuo-Chang,Zhang Zhong-Tao,Lin Chang-Song et al. Sedimentary types and features of gravity flow depositional systems from Late Oligocene to Early Miocene in Liwan sag, Pearl River Mouth Basin[J]. JOPC, 2020, 22(6): 1143-1156.
Xing Zuo-Chang,Zhang Zhong-Tao,Lin Chang-Song et al. Sedimentary types and features of gravity flow depositional systems from Late Oligocene to Early Miocene in Liwan sag, Pearl River Mouth Basin[J]. JOPC, 2020, 22(6): 1143-1156.
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