【摘要】 <正>深水水道作为输送陆源碎屑沉积物到深海盆地的重要通道,对沉积物起到约束和分类作用。通过研究深水水道的沉积与演化过程可进一步对深海盆地沉积物源进行分析。通常,在水道轴部沉积粗粒沉积物,堤坝部位沉积细砂、粉砂和泥等细粒沉积物,水道沉积体系可作为很好的油气储集体。研究表明,深水水道具有复杂的内部结构、多次侵更多还原

【Abstract】 A deepwater channel complex sedimentary system developed on or beneath slope,and on basin floor.Deepwater channels act as important conduits for transporting terrigenous detrital materials to deepwater basin,and control the formation and evolution of deepwater sedimentary systems.Generally,a deepwater channel complexforms during the periodt of a relative low stand of sea level,when large volumes of coarse-grained sediment erode the slope and deposit on basin floor.The internal fill is often quite complex,and the nature of channel-fill deposits varies greatly. Deepwater chanels tend to develop a smooth longitudinal upconcavity that is balanced between erosion and deposition.Based on 2D seismic data and stratigraph,we recognized a central deepwater channel complex sedimentary system,which probably formed during the early Pliocene at 5.0 Ma in Qiongdongnan Basin northern South China Sea.On seismic reflection profiles,the studied channels present an overall"U"or"V"shape and middle-high-amplitude continual seismic phase.Combining the lithologic layering from drilling well and the published channel filling model, we constructed a model of the studied channel complex and found that most of them were sandstone-rich aggradational channel-fill patterns.the deepwater channel complex can act as good hydrocarbon reservoirs.更多还原