Fluvial sequence pattern and its response of geomorphy in depression phase of rift basin: A case study of the Lower Member of Neogene Minghuazhen Formation in Shaleitian Uplift area, Bohai Bay Basin
Tan Ming-Xuan1,2,3, Zhu Xiao-Min2,3, Zhang Zi-Li2,3, Liu Qiang-Hu4, Shi Wen-Long5
1 College of Oceanography,Hohai University,Nanjing 210098,China; 2 State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum(Beijing), Beijing 102249,China; 3 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China; 4 Faculty of Earth Resources,China University of Geosciences(Wuhan), Wuhan 430074,China; 5 Tianjin Branch of CNOOC Ltd., Tianjin 300452, China
Abstract：The sequence classification is a difficulty of sequence stratigraphic study on rivers that are distal to coast area during the depression phase of rift basin. Based on the integrated analysis of logging,cores and seismic data,the case study shows that the Lower Member of Neogene Minghuazhen Formation in the Shaleitian Uplift area in the western Bohai Sea region corresponds to one complete third-order sequence which can be divided into four fourth-order sequences(i.e. SQm1-SQm4). Sedimentary hiatus,wide and shallow incised valley and amalgamated channel sand bodies are the main recognition of sequence boundaries in fluvial sequence stratigraphy of the study area. Each fourth-order sequence comprises low and high accommodation systems tracts. According to seismic sedimentological and quantitative geomorphological analysis,low-sinuosity rivers including braided river and low-sinuosity meandering river are well developed in the low accommodation systems tract,whereas the medium- to high-sinuosity meandering rivers are well preserved in the high accommodation systems tract. The change in the new creation of accommodation and the sediment supply exert a significant control on the stacked pattern within different systems tracts.
Tan Ming-Xuan,Zhu Xiao-Min,Zhang Zi-Li et al. Fluvial sequence pattern and its response of geomorphy in depression phase of rift basin: A case study of the Lower Member of Neogene Minghuazhen Formation in Shaleitian Uplift area, Bohai Bay Basin[J]. JOPC, 2020, 22(3): 428-439.
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