Sedimentary characteristics and evolution of thin interbeds of the Member 2 of Paleogene Liushagang Formation in eastern Wushi sag,Beibu Wan Basin
Sun Le1, 2, Yu Xinghe1, 2, Li Shengli1, 2, Zhang Hui3, He Yulin4, Yang Kaile3, Qiao Yarong1, 2, Zhang Wenmiao1, 2, Wu Zijin1, 2, Gao Mingxuan1, 2
1 School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083; 2 Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism,Ministry of Education,Beijing 100083; 3 Zhanjiang Branch,CNOOC Ltd.,Zhanjiang 524057,Guangdong; 4 Guangzhou Marine Geological Survey,Ministry of Land & Resources,Guangzhou 510760,Guangdong
Abstract The structure and sedimentary characteristics of the Member 2 of Liushagang Formation in the eastern Wushi sag,Beibu Wan Basin are very complex. The sedimentation is of great variation with sharp lateral changes. The understanding of sediment provenance and sedimentary facies is controversial. Using core,logging,seismic,and laboratory data,the present study attempts to: (1)investigate sediment provenance,sedimentary facies and evolution of the Member 2 of the Liushagang Formation in the study area;(2)determine the distribution and evolution of sedimentary facies in the study area;(3)predict favorable reservoir distribution characteristics;and(4)to better serve the oil and gas exploration and development. Results from this study suggest that the northern high-lying area represents the sediment provenance of the Member 2 of the Liushagang Formation,which is characterized by the delta front-deep lake sedimentary sequence. The normal deltaic sediments were well developed,and the thickness of individual sand bodies is small,which manifests as multilayer interactive distribution. The Member 2 of the Liushagang Formation is divided into four 4th￣order sequences from bottom to top. MSC2 and MSC3 sequences formed during the short-term rapid water regression were involved into the process of longer-term water transgression. The sediment supply was sufficient,sand bodies were,thus,well developed. Observations from this work suggest that the buried depth and sedimentary facies play a pivotal role in the modulation of the reservoir properties of the Member 2 of the Liushagang Formation. Reservoir properties of B oil field are better than those of A oil filed. The subaqueous distributary channel and estuary dam developed near the source of the delta front are favorable reservoir distribution areas.
Fund:Financially supported by the National Science and Technology Major Project of China (No.2016ZX05024-002-002)
Corresponding Authors:
Yu Xinghe,born in 1958,is a professor and doctoral supervisor. He is mainly engaged in researches of petroleum reservoir sedimentology,marine resources and petroleum-bearing basin analysis. E-mail: billyu@cugb.edu.cn.
About author: Sun Le,born in 1988,is a Ph.D. candidate of China University of Geoscience(Beijing). His research field is petroleum reservoir sedimentology,oil and gas reservoir development. E-mail: geology_sunle@163.com.
Cite this article:
Sun Le,Yu Xinghe,Li Shengli et al. Sedimentary characteristics and evolution of thin interbeds of the Member 2 of Paleogene Liushagang Formation in eastern Wushi sag,Beibu Wan Basin[J]. JOPC, 2017, 19(6): 1023-1036.
Sun Le,Yu Xinghe,Li Shengli et al. Sedimentary characteristics and evolution of thin interbeds of the Member 2 of Paleogene Liushagang Formation in eastern Wushi sag,Beibu Wan Basin[J]. JOPC, 2017, 19(6): 1023-1036.
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