Oil & Gas Geology ›› 2016, Vol. 37 ›› Issue (4): 499-508.doi: 10.11743/ogg20160406

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Features and evolution of sedimentary facies in the second Member of Paleogene Shahejie Formation in Bonan Subsag,Bohai Bay Basin

Song Fan1, Qiu Longwei1, Su Nina1, Xu Ningning1, Zhou Peng1   

  1. 1. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China;
    2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong 266071, China
  • Received:2015-07-16 Revised:2016-06-27 Online:2016-08-08 Published:2016-09-06

Abstract: In order to reveal the sedimentary facies distribution and evolution pattern of the 2nd Member of Shahejie Formation in Bonan Subsag of Bohai Bay Basin and to find new target areas for future oil and gas exploration in Zhanhua depression,we classiffied and correlated the sand groups of the 2nd Member of Shahejie Formation,delineated the distribution of sedimentary facies in different historical periods and summarized the sedimentary evolution pattern based on the comprehensive study of core,logging and seismic data.Four sand groups were identified in the 2nd Member of the Shahejie Formation in Bonan Subsag.They overlap each other southwards and get larger progressively in distribution area.Near the uplift zone around the Bonan Subsag,fan delta front deposits are predominant and consist mainly of underwater distributary channel microfacies,followed by channel mouth bar and subaquatic interdistributary embayments.Inside the Bonan Subsag,shore-shallow lacustrine beach bars are predominant and can be divided into three types with different distribution patterns according to their origin,namely normal sandy beach bars,sandstone and carbonate mixed beach bars and storm beach bars.The sedimentary evolution of the 2nd Member of Shahejie Formation features in continuous enlarging of lake basin,progressive expanding of sedimentary range.decreasing of fan delta distribution area,and increasing of beach bar distribution area.

Key words: fan-delta, beach bar, sedimentary facies, 2ndMember of Shacchejie Formation, Bonan Subsag, Bohai Bay Bosin

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