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《Journal of Northeast Petroleum University》 2017-06
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Provenance element control over the differential sedimentation of sand body in Ed_3 of west sag around Bozhong depression

Zhou Xiaoguang;Huang Xiaobo;Song Zhangqiang;Li Jin;Liu Rui;Wang Qiming;Bohai Research Institute of Tianjin Branch,CNOOC;  
In order to define the way provenance elements control the differential sedimentation of sand body,and accurate prediction of reservoir,using drilling well-logging and latest 3 D seismic data,reconstructing the paleogeomorphy when 3 rd member of Dongying formation was developed in both west section of Shijiutuo salient and Shaleitian salient eastern section in west sag around the Bozhong depression. Quantitative characterization of provenance size,parent rocks,macroscopic paleogeomorphy and paleo-ravine. The results show that the parent rocks in north part of east section of Shaleitian salient is vast,its type is primarily metamorphic granite from Precambrian period,and larger scale,however because the macroscopic paleogeomorphy was elevated which is not an ideal direction for sediment moving,also considering the lack of paleo-ravine,the sedimentation of sand in this sedimentary area is relatively low. The parent rocks in south of Shijiutuo salient west section is less developed but also vast,and large scale,notably the paleo-terrain is lying low which is ideal for sand body edimenta-tion,further considering the development of ancient valley in large number,well connected in the dimension of time and space,huge scale,good width/depth ratios,this sedimentary area has greater sand body development.Favorable parent rocks,huge scale of provenance combined with low-lying macroscopic paleogeomorphy,and sedimentation in well-developed paleo-ravine makes good target for sandstone reservoir.
【Fund】: 国家科技重大专项(2011ZX05023-002)
【CateGory Index】: P618.13
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