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一种新的曲流河点坝砂体内部构型模拟方法 被引量:8

An enhanced method for modeling internal architecture of point bar sand body in meandering alluvial rivers
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摘要 本文首先根据弯道水流运动方程和河岸迁移公式,建立了曲流河道演化模型。在进行河道演化模拟过程中,通过河道曲率确定点坝砂体的生成位置,并在侵蚀系数的控制下依次模拟侧积体和侧积层,建立起了河道演化与点坝构型元素沉积的耦合数值模型。最后根据此耦合模型对嫩江现代曲流沉积进行了模拟。结果显示,该方法不仅能够准确地再现河道的真实弯曲形态,还能表征点坝砂体的复杂几何形态,并再现点坝内部构型元素之间的配置关系,同时该方法由于能够通过侵蚀系数图最大可能地综合利用已有地质资料,因此其模拟结果与嫩江现代曲流沉积十分接近,是一种有效的点坝内部构型建模方法。 This paper proposes an enhanced method for modeling internal arechitecture of point barsand body.First a migration model of meandering rivers is established based on hydraulic equations.Then the location of point bar sand body generated is determined according to the curvature of centerlines. And the lateral accretion beddings and lateral accretion body are sequentially simulated under the control of erosion coefficient.Finally,the coupled numerical model is established.The applications in Nen River show that this method reproduces not only the curving geometries of channels,but also accurately characterize the shape of point bar and the arrangement relationship of internal architecture elements.At the same time,the simulation result coincide with real geological case as this method can incorporate geological data as much as possible by using erosion coefficient map.So this method is an effective modeling method.
出处 《石油地球物理勘探》 EI CSCD 北大核心 2013年第A01期151-156,203+11-12,共6页 Oil Geophysical Prospecting
关键词 曲流河 点坝砂体 侧积层 内部构型 meandering river,point bar,lateral accretion beddings,internal architecture
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