Influence of Lake Level Fluctuation on Sandbody Shapes at Shallow—Water Delta Front
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摘要: 三角洲平原上的分流河道通过填积和湖面的频繁波动向湖泊中心方向长距离推进，在浅水三角洲前缘的浅水区发育很有特色的水下分流河道，且在湖面频繁波动过程中，河流、波浪和沿岸流的冲刷作用对沉积物分布起到再改造作用，导致了以水下分流河道砂体为主的三角洲前缘砂体不同程度的席状化。随着气候变得潮湿，湖面相对稳定，季节性、周期性湖面波动的频率、幅度减小，水动力对三角洲前缘砂体的改造和席状化强度减弱。Abstract: At the geologic setting of shallow-water delta.distributary channels on plain palin can stretch into lake very long distance by sediment filling and the lake level frequent fluctuation.developping obvious subaqueous channel at wide shallow water delta front.At the same time,the lake level fluctuation,hydrodynamics,suchas channel,wave and offshore current,will change the distribution of sedimentary materials,and results in delta front sandbodies sheetlization,which mainly occurs in the subaqueous channel sandbodies.Along with the climate become more moist,the frequence and range of lake level fluctuation is also smaller,and the hydrodynamics reworks the distribution of sedimentary materials on delta front and sandbody sheetliation become weaker at the same time.
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