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Reservoir architecture patterns of sandy gravel braided distributary channel A case study of Triassic Upper Karamay Formation,Xinjiang oilfield

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Petroleum 2016年第2期2卷 117-129页

作者： Senlin Yin Zhangming Hu Xiang Ren Xiaojun Wu Yanhui Chen Lijun Zheng Zhibin Jiang Institute of Mud Logging Technology and Engineering Yangtze UniversityJingzhouHubei434023China Western Drilling Engineering Company of PetroChina Karamay 834000China Research Institute of Exploration and Development Xinjiang Oilfield CompanyKaramay 834000XinjiangChina

The purpose of this study was to discuss shape,scale and superimposed types of sandy gravel bodies in sandy-gravel braided distributary channel.Lithofacies analysis,hierarchy bounding surface analysis and subsurface dense well pattern combining with outcrops method were used to examine reservoir architecture patterns of sandy gravel braided distributary channel based on cores,well logging,and outcrops data,and the reservoir architecture patterns of sandy gravel braided distributary channels in different grades have been established.The study shows:(1)The main reservoir architecture elements for sandy gravel braided channel delta are distributary channel and overbank sand,while reservoir flow barrier elements are interchannel and lacustrine mudstone.(2)The compound sand bodies in the sandy gravel braided delta distributary channel take on three shapes:sheet-like distributary channel sand body,interweave strip distributary channel sand body,single strip distributary channel sand body.(3)Identification marks of single distributary channel include:elevation of sand body top,lateral overlaying,“thick-thin-thick”feature of sand bodies,interchannel mudstone and overbank sand between distributary channels and the differences in well log curve shape of sand bodies.(4)Nine lithofacies types were distinguished in distributary channel unit interior,different channel units have different lithofacies association sequence.

关键词： Distributary channel Gravel braided channel delta Reservoir architecture 31st section of Pinglianggou block yizhong

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