Sedimentary characteristics and controlling factors of large-scale longshore bar in the Oligocene Huagang Formation, Xihu sag
Li Shun-Li1, Li Jing2, Chen Bin-Tao3, Xu Lei2, Yu Xing-He1, Hou Guo-Wei4, Gao Zhao-Pu5
1 School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China; 2 CNOOC Research Institute Co.,Ltd.,Beijing 100028,China; 3 Northwest Branch,PetroChina Exploration and Development Research Institute,Lanzhou 730020,China; 4 CNOOC Research Institute Shanghai Branch Co.,Ltd.,Shanghai 200030,China; 5 Research Institute Exploration and Production in SINOPEC North China Branch,Zhengzhou 450000,China
Abstract The Xihu sag is located in the eastern depression of the East China Sea Shelf Basin,which is the largest hydrocarbon-bearing sag in this basin. It has been debated on sedimentary environments and sedimentary systems of the Oligocene Huagang Formation as the major reservoir. On the basis of cores,well-logging response,and seismic reflection characteristics,three typical lithofacies types of thick sandstone in the Huagang Formation are identified in the central-eastern Xihu sag,namely as massive gravelly medium sandstone,fine-medium sandstone with swash beddings,and silt-fine sandstone with ripples. Statistics of sedimentary structures parameters indicate the thick-bedded sandstone of the Huagang Formation were developed in washing zone along shoreline with strong hydrodynamic condition and wave action. On the gamma logging curve,the thick sandstone is characterized by low-amplitude,blocky pattern in the lower part,gradually changing to high-amplitude,jagged pattern in the top part. On the seismic profile,mound reflections with flat bottom and convex-up top show the medium amplitude and continuity,indicating the large-scale longshore bar systems. Stacked pattern and spatial distribution were depicted combined with well-logging patterns and matching of seismic attributes and sand content. The longshore bar systems of the Huagang Formation in the Xihu sag were mainly developed at edge of the delta front in the eastern part of the study area,which is formed from the earlier braided-river delta front reworked by wave action during base level fall.
Fund:Co-funded by the National Natural Science Foundation of China(No.41802129),and National Science and Technology Major Project(Nos.2016ZX05024-002,2017ZX05001-002)
Corresponding Authors:
Yu Xing-He,born in 1958,is a professor and Ph.D. supervisor at China University of Geosciences(Beijing),mainly engaged in researching and teaching in hydrocarbon-bearing basins,reservoir geology and modelling technology. E-mail: billyu@cugb.edu.cn.
About author: About the first author Li Shun-Li,born in 1987,Ph.D. and Post-doctor,is an associate professor at China University of Geosciences(Beijing),mainly engaged in researching and teaching sedimentology and reservoir geology of clastic rocks. E-mail: lishunli@cugb.edu.cn.
Cite this article:
Li Shun-Li,Li Jing,Chen Bin-Tao et al. Sedimentary characteristics and controlling factors of large-scale longshore bar in the Oligocene Huagang Formation, Xihu sag[J]. JOPC, 2020, 22(3): 493-503.
Li Shun-Li,Li Jing,Chen Bin-Tao et al. Sedimentary characteristics and controlling factors of large-scale longshore bar in the Oligocene Huagang Formation, Xihu sag[J]. JOPC, 2020, 22(3): 493-503.
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