高精度转换波速度分析

转换波速度分析在多波地震资料处理中占有重要地位。常规转换波速度是先抽CCP道集 ,然后进行转换波分析 ,而抽CCP道集需要速度 ,转换速度分析的目的又是为了计算速度 ,因此常规转换波速度分析是一个迭代的过程。精确的无迭代分析方法在速度扫描过程中 ,根据转换波层位时间、纵波速度和横波速度 ,动态地抽取相应层位的CCP道集和计算速度分析检测因子 ,来实现精确无迭代转换波速度分析。实际资料处理结果表明该方法可行。

High precision velocity analysis of converted wave

Velocity analysis of converted wave is a very important step in multi-wave seismic data processing. Conventional method for converted wave velocity analysis extracts CCP (Common Converted Point) gather firstly, then does velocity analysis on this gather. Forming CCP gather needs velocity, while the purpose of velocity analysis is to obtain velocity, therefore, conventional velocity analysis is an iterative process. This paper advances an accurate non-iterative method which extracts CCP gather according to changing vertically travelling time of converted wave, P wave velocity and S wave velocity in the process of velocity analysis, and calculates measurement coefficients to identify events and velocity. Real data processing has proved this method to be effective.