三维三分量VSP数据处理方法及效果

三维三分量VSP数据处理是一项系统工程。由于观测系统的特殊性，数据处理既不能借用常规的非零井源距多分量VSP数据处理方法，也不能采用目前地面地震多分量数据的处理方法。为此，本文针对三维三分量VSP数据的特点，在三维VSP速度分析、波场分离、纵波和转换波的三维深度成像等几个方面进行了研究，摸索出一套处理方法。通过对MB2003井区VSP数据的处理，得到了纵、横波速度体；通过三分量处理及基于拉冬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；根据速度反演结果，在深度域对纵波和转换波进行成像，分别得到两个成像数据体，且具有良好的对比性，有利于资料解释。其中转换波成像显示出更高的分辨率和信噪比，具有良好的应用前景。

3D,3C VSP data processing methods and effects.

3D,3C VSP data processing is a systematic engineering. Because of speciality of geometry, the VSP data processing can neither use the ordinary non-zero offset multi-component VSP data processing methods, nor use the current land seismic multi-component data processing methods. In that reason,faced with the 3D,3C VSP data characteristics , the paper studied the following aspects:3D VSP velocity analysis, wavefield separation, 3D depth imaging of P-wave and PS-converted wave and probed a set of processing methods. The velocity data volume has been gained after the VSP data processing in MB 2003 well-site; the up-going Pwave and PS-converted wave have been successfully separated by 3C data processing and joint wavefield-separation based on Radon transform and polarization analysis; imaging processing of P-wave and PS-converted wave in depth domain have been implemented and both imaging data volumes have been obtained separately according to the results of velocity inversion,which have good correlation and are of benefit to data interpretation, among which the imaging of PS-converted wave showed higher resolution and S/N ratio, which has good applied prospect.