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以Kuo等给出的矢量波场延拓公式为基础,引入表征反射纵波及转换横波在成像点处射线方向的单位矢量,本文导出了矢量波场弹性波Kirchhoff偏移方程。基于该方程,利用炮记录同相轴斜率和射线追踪方法,求得反射波的镜像反射点,进而对反射数据进行Fresnel带偏移,有效地降低了多波以非本波型速度传播造成的成像假像和有限孔径接收造成的偏移假象。模型试算表明了该方法的有效性和正确性。
Based on the vector wave field extension formula given by Kuo et al., The unit vectors of the reflected longitudinal and converted transverse waves at the imaging point are introduced. In this paper, the Kirchhoff migration equation of the elastic waves in the vectorial wave field is derived. Based on the equation, the mirror reflection point of the reflected wave is obtained by using the method of recording the slope and ray tracing method of shot recording, and the Fresnel band shift of the reflected data is effectively reduced, thereby effectively reducing the imaging caused by multi-wave propagation in non-local wave velocity Offset artifacts caused by artifacts and limited aperture reception. The model trial shows the validity and correctness of the method.