多方位Walk-away VSP处理方法

Multi-azimuth Walk-away VSP data processingmethods

中国石化胜利油田有限公司物探研究院, 山东东营 257000

GRI, Shengli Oilfield. Ltd. Co. , Dongy-ing 257022,China

从观测系统的定义、抽道集、速度分析、波场分离、纵波和转换波深度域成像等方面对多方位Walk-away VSP资料处理方法进行了讨论。首先利用数据分选技术从三维数据体中抽取不同方位的Walk-away VSP数据;然后通过综合三分量定位处理和中值滤波、f-k滤波、τ-P变换、偏振分析等波场分离方法,将上行反射纵波(P-P波)和转换波(P-SV波)分离出来;最后根据速度分析结果建立速度模型,进行深度域偏移成像,得到纵波和转换波的成像剖面。在垦71井区利用多方位Walk-away VSP资料处理方法获得了很好的成像效果,偏移剖面与高精度三维地震剖面的品质相当。

This paper discussedmulti-azimuth Walk-away VSP data processing in terms of the geometry definition, data extraction, Walk-away VSP velocity analysis, wave-field separation and 1D depth Kirchhoffmigration imaging. Firstly, Walk-away VSP was extracted in different azimuth from 3-D data set. Then synthetic 3C processing,median filtering, f-k filtering,τ-P transform and polarization analysis, etc separated the up-going P-wave and PS-converted wave. Finally, depthmigration imaging is conducted according to the velocity a-nalysis results and 1D velocitymodel. Throughmulti-azimuth Walk-away VSP data processing, themigrated section had high resolution and SNR in KEN71 well site.