Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (5): 1-10.doi: 10.12108/yxyqc.20180501

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Quantitative characterization of source-sink system of Ed3 in Shinan steep slope zone,Bozhong Depression

DU Xiaofeng, WANG Qingbin, PANG Xiaojun, DAI Liming, ZHANG Can   

  1. Bohai Oilfield Research Institute, Tianjin Branch of CNOOC Ltd., Tianjin 300459, China
  • Received:2018-03-01 Revised:2018-04-02 Online:2018-09-14 Published:2018-09-14

Abstract: In order to solve the glutenite reservoir distribution of the third member of Paleogene Dongying Formation(Ed3) in the Shinan steep slope zone of Bozhong Depression,using 3D seismic interpretation,drilling, experimental data,the key factors(parent rock,valley system,fault active rate,sedimentary paleo-terrain,lakelevel change) in the source-sink system were quantitatively characterized. The results show:(1) The reservoirs in the Ed3 are mainly fan delta facies. The lithologies of their parent rock are composed of Mesozoic volcanic rocks in the south and volcanic rocks,carbonate rocks and granites in the northwest.(2) Five large and long valley systems are identified,which carry larger volume of glutenite from the provenance zone to the sink zone.(3) The Ed3 sedimentary palaeogeography is dominated by faults,which are characterized by segmented activities. The difference in activity results in the difference between the source and the sink zone.(4) The extension distance of the gravel is positively related to the decline of the slop. The closer the lake surface is to the source,the shorter the gultenite extends;conversely,the longer the glutenite extends. The scale of the glutenite is affected by the influence of source system,fault activity and lake level. The erosion of the source and the paleogeomorphology of the sink zone are mainly controlled by the fault activity. This rule provides a reference for the evaluation of glutenite reservoir in steep slope of faulted basin.

Key words: glutenite, source-sink system, valley system, Dongying Formation, Bozhong Depression

CLC Number: 

  • TE122.1
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