利用多分量地震数据反演近地表横波速度

An inversion method for near-surface shear-wave velocity using multi-component seismic data

在陆上多波地震资料处理中,转换波资料静校正需要获得准确的近地表横波速度。文中从分析多分量地震记录波场出发,提出利用多波资料中的X与Z分量数据进行近地表横波速度反演的方法。利用X、Z分量上折射波信息,获取水平慢度和偏振角度,进而反演近地表的横波速度。通过数学模型与实际资料的应用,表明反演的近地表横波速度较为准确,可以准确地反映近地表的横波速度变化。

In land multi-component seismic data processing,the accurate near-surface shear-wave velocity is needed in converted-wave static correction.In this paper,we propose a method in which the near-surface shear-wave velocity can be inverted by X and Z component data after analyzing the wave field of multi-component seismic record.Horizontal slowness and polarization angle can be derived using refracted wave information in X and Z component,and then the shear-wave velocity can be inverted.The method is tested on model data and real data.The results show the inverted near-surface shear-wave velocity is reliable,and can be used to characterize exactly the near-surface strata.