P－SV转换波的一种处理方法─叠前抽道集法

A PROCESSING METHOD OF P-SV WAVE PRESTACK TRACE GATHERING METHOD

本文利用纵波和横波的迭加速度资料来计算Ｐ－ＳＶ波勘探中转换点的近似位置。再按转换点对Ｐ－ＳＶ波重新抽道集，得到可与反射资料ＣＭＰ道集相兼容的时间剖面图。利用理论模型对上述方法进行了可靠性检验，并用该方法对实际资料作了处理。同时还得到了实际资料的Ｐ波和Ｐ－ＳＶ波的彩色振幅比剖面图。结果表明：采用改进的叠前抽道集法所得到的剖面图具有很好的空间分辨率。

The Stacking velocities for both compressional and shear wave reflection data was used to estimate the approximate location of the conversion points of the P-SVwave exploration in this paper. Acoording to the approximate location of convereion points regathering converted data, the time section of converted wave compatible with the CMP reflection data was obtained. Using this technique the data of theo.retical model and practical seismic exploration were processed. and the results demonstrates that stacked converted wave time sections obtained using the new gathering method have better spatial resoltion then those obtained using conventional CMP gathers. Finally, the color amplitude ratio section of Pwave and P-SVwave for practical seismic data was obtained.