油气地质与采收率2017，Vol.24Issue(6)：7-16,10.
湖南保靖地区下志留统重力流沉积特征及沉积模式
Sedimentary characteristics and models of early Silurian gravity flow deposits in Baojing area of Hunan Province
摘要
Abstract
Based on cores data and gravity flow theory,the sedimentary characteristics and models of early Silurian gravity flow deposits were systematically analyzed in Baojing area of Hunan Province,which intends to reveal formation mechanism of shale gas reservoir and determine its temporal and spatial distribution and thus guide the shale gas exploration.The results show that there are three types of gravity flow developed during the early Silurian in Baojing area of Hunan Province,including turbidity currents,debris flow and liquid flow.Among them,the turbidite current results in incomplete Bouma sequence,which is composed mainly of progradational strata formed by superposition of multiple single-section or twosection turbidite at the bottom and aggradational strata formed by superposition of multiple three-section turbidite at the top.Massive fine sandstone is the dominant lithology developed from debris flow.Thick layer of argillaceous siltstone and silty mudstone are the dominant lithology developed from liquid flow,in which deformation bedding develops.From the deposition of Longmaxi Formation to the deposition of Majiaochong Formation in the early Silurian,submarine fan,off-shore underwater fan and slump-slip fan developed intermittently in Baojing area of Hunan Province.Turbidity current mainly results in fan-end turbidite sand and fan-end mud of submarine fan,braided channel,channel edge and front sheet sand at mid submarine fan and channel edge and front sheet sand at off-shore subaqueous fan.The debris flow results in braided channel at off-shore underwater fan.The liquid flow results in slump-slip channel at mid fan and bay at inter channels.关键词
重力流/浊流/液化流/碎屑流/下志留统/湖南保靖地区Key words
gravity flow/turbidity current/liquid flow/debris flow/early Silurian/Baojing area of Hunan Province分类
能源科技引用本文复制引用
李斌,胡博文,罗群,晋长昊..湖南保靖地区下志留统重力流沉积特征及沉积模式[J].油气地质与采收率,2017,24(6):7-16,10.基金项目
国家自然科学基金项目“云质岩致密油储层微米-纳米孔喉网络体系及其流体耦合流动机理与流动下限”(41372145). （41372145）
