振幅曲率属性在浅层河道砂体描述中的应用

The Application of Amplitude Curvature Attributes to Description of Shallow River Channel Sand Bodies

为了更好地刻画浅层河道砂体的空间展布特征,在地震振幅属性分析的基础上,进行曲率分析,获得地震振幅体更细微的变化,从而更精确地指导解释工作。阐述了振幅曲率属性的数学原理及物理意义,并针对浅层河道砂体在地震剖面上同向轴扭曲、下切等地震反射特征,先求取地震振幅属性,再对地震振幅体求取曲率属性,最后通过地层切片对比分析地震振幅属性与振幅曲率属性在平面上刻画河道展布的效果。应用实例表明,振幅曲率属性刻画河道边界更加连续,刻画细小分支河道上更加清楚,并且在一定程度上压制了背景信息,更加突出了河道的展布形态,取得了良好的应用效果。

In order to depict the spatial distribution of shallow river channel sand bodies better,on the basis of the analysis of seismic amplitude attributes,the curvature analysis can be carried out to obtain more subtle changes of the seismic amplitude body,so as to guide the interpretation work more precisely.In this paper,the mathematical principles and physical meanings of the amplitude curvature attributes are described.Based on the seismic reflection characteristics of the shallow river channel sandstone in the seismic section,the seismic amplitude attributes are obtained first,and the amplitude curvature is obtained.And finally,the effects of the seismic amplitude attributes and the amplitude curvature attributes on the plane are compared on stratigraphic slices.The application examples showthat the portrayed river boundary of the amplitude curvature attributes is more continuous,the portrayed smaller branch river is more clear,the background information is surpressed to a certain extent,and the river distribution pattern is highlighted much more,which have achieved a good application effect.