Sedimentary filling characteristics and evolution of the Paleogene Wenchang Formation in Baiyun main sag,Pearl River Mouth Basin
Guo Wei1,2,3, Xu Guo-Qiang3, Chen Zhao-Ming1,2, Li Xiao1,2, Xiang Xu-Hong1,2, Liu Dong-Qing1,2
1 Shenzhen Branch of CNOOC China Ltd., Guangdong Shenzhen 518054,China; 2 CNOOC Deepwater Development Ltd.,Guangdong Shenzhen 518054,China; 3 College of Energy Resources,Chengdu University of Technology,Chengdu 610059,China
Abstract：Due to the lack of drilling data and complex geological conditions,characteristics of de positional system and associated sedimentary-filling evolution in the third-order sequence framework of Wenchang Formation in Baiyun main sag lack systematic study,which seriously restricts the oil and gas exploration in the deep strata of Baiyun main sag. Based on 3D seismic data and drilling data,this paper reconstructs the sedimentary system of the third-order sequence of Wenchang Formation by using new technologies and methods such as the restoration of original form structure section of sedimentary sequence,the analysis of enhanced seismic facies,and the seismic scanning interpretation of sand bodies,then restores the sedimentary-filling evolution process of Wenchang Formation in combination with the characteristics of tectonic evolution. The results show that there are four “source-to-sink” systems in the Wenchang Formation of Baiyun main sag. They are large-scale braided delta-lacustrine facies deposits developed in the northwest inherited gentle slope zone and derived from pure terrestrial clastics,large-medium scale braided delta-lacustrine facies deposits developed in the northeast gentle slope zone and derived from terrigenous-pyroclastic mixed sources,inshore subaqueous fan and fan delta-lacustrine facies deposits developed in the southwest abrupt slope zone and sourced from pure terrigenous clastics,small-scale nearshore subaqueous fan and fan delta-lacustrine deposits developed in the southeast steep slope zone and derived from terrigenous-pyroclastic mixed sources. The sedimentary evolution of the Wenchang Formation in Baiyun main sag can be divided into six stages: fluvial deposition(lower segment of WCSQ1),fluvial-lake deposition(upper segment of WCSQ1),ultra-deep lake occurrence(lower segment of WCSQ2),ultra-deep lake early filling(upper segment of WCSQ2),ultra-deep lake filling(WCSQ3,WCSQ4)and shallow lake occurrence(WCSQ5). The lake basin undergone a sedimentary evolution process of initial basin forming,intense rift into ultra-deep lake,large-scale sedimentary filling into deep lake and semi-deep lake,and finally sedimentary filling into shallow lake.
Guo Wei,Xu Guo-Qiang,Chen Zhao-Ming et al. Sedimentary filling characteristics and evolution of the Paleogene Wenchang Formation in Baiyun main sag,Pearl River Mouth Basin[J]. JOPC, 2022, 24(1): 112-128.
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