基于深度约束的转换波速度分析

Converted Wave Velocity Analysis Based on Depth Restriction

在常规转换波速度分析中,纵波速度分析所产生的误差将传播至转换横波速度分析中。研究表明,随着纵波速度误差的增大,转换波速度误差向相反方向增大,且增加的幅度会进一步放大。为控制纵波速度误差的传播,将岩层埋藏深度作为约束条件进行转换波和纵波速度分析。结果表明,在加入深度约束后,随着纵波速度误差的增大,虽然转换波速度误差仍向相反方向增大,但其误差增幅会明显减少。通过对比分析发现,在加入深度约束条件后,可大幅度减小因纵波速度误差所引起的转换波速度误差。

In conventional converted wave velocity analysis, the errors from compressional velocity analysis will be spread to converted shear velocity analysis. The analysis has shown that along with the increasing of compressional velocity error, the converted wave veloci~ ty error increasing reversely, and further enlarged. To control the spread of compressional velocity error, can take the strata buried depth as constraint condition to carry out converted wave and compressional velocity analyses. The result has shown that after the depth restriction added, along with compressional velocity error increasing, although converted wave velocity error still increasing reversely, but greatly redUced. Through comparative analysis has found that after depth restriction added, can greatly reduce converted wave ve- locity error caused by compressional velocity error.