三维三分量Walk-away VSP处理方法及效果分析

针对三维三分量Walk-awayVSP数据的特点,从观测系统定义、数据提取方法、抽道集、波场分离、纵波和转换波的一维深度域成像等方面进行了研究,初步形成了一套间接的三维VSP处理方法。在对垦71井区VSP数据的处理中,利用三分量处理和线性滤波、F—K滤波及基于τ—P变换和偏振分析的联合波场分离方法有效地分离出上行纵波和转换波;根据速度分析和一维速度模型在深度域对上行纵波和转换波进行成像,分别得到了两个成像剖面,其中转换波成像具有更高的分辨率和信噪比,显示出其良好的应用前景。

3D 3C Walk-away VSP data processing methods and effects

3D 3C Walk-away VSP data processing is a systematic engineering process. Because of the specialty of its geometry, the VSP data processing can neither use the ordinary zero and non-zero offset multi-component VSP data processing method, nor use land surface seismic multi-component data processing method. To validate the 3D 3C Walk-away VSP data characteristics, the observation system definition, data extraction, Walk-away VSP velocity analysis, wave-field separation, 1D depth Kirchhoff migration imaging are studied . Through the VSP data processing in KEN 71 well-site the up-going P-wave and PS-converted wave have been successfully separated. Two imaging sections were obtained according to the velocity analysis results and 1D velocity model, the converted wave imaging is of higher resolution and SNR, there the sults show it has a good applied application prospect.