P-SV转换波速度分析及解释方法

Velocity analysis and interpretation of P-SV wave

本文针对P－SV转换波备料，比较系统地分析了P－SV转换渡时距方程中各因素的依赖关系和变化规律，研究出一套由转换波资料直接求取横波速度vs的方法和软件，并提出了一套转换政速度谱解释方法和分析步骤。用该方法求得的横渡速度值不仅精度高，而且司按top、tops、tos三种不同的时间坐标显示，便于结合纵波速度直接标定或对比纵、横波剖面的反射层位，求取泊松比、速度比等响关参数，为岩性勘探提供有用的信息。

The authors carefully analyse interdependence and variation of the factors inthe time-distance equation of P-SV wave,develop tnethod and softwares for derivingshear wave velocity (vs) from P-SV wave data,and describe their way for thc velocity spectrum interpretation. The shear wave velocity estirnated in this method hashigh accuracy and can be displayed in top,tops and tos time coordinates. What is more,the shear wave velocity and cornpressional wave velocity can be nicely used to mark(or correlate) the reflection horizons in compressional wave and shear-wave sec-tions,and to estimate useful parameters for lithology exploration,such as Poissno'sratio,velocity ratio and so on.