CAJ | 학술논문

分离P-P波和P-SV波最常用的是τ-p变换法,但是在τ-p域中,P-P波和P-SV波常有重叠部分,不能很好分离.地震勘探中,当炮检距小于界面深度时,P-P波和P-SV波的时距曲线方程都可近似为抛物线方程.针对这种情况,提出了一种基于抛物线方程的坐标拉伸τ-p变换的P-P、P-SV波分离方法,该方法首先对地震记录沿空间方向上进行坐标拉伸,再进行τ-p正变换,在τ-p域中分离P-P波和P-SV波,其次对P-P波和P-SV波分别进行τ-p反变换,实现P-P波和P-SV波的分离.与常规τ-p变换法对比分析表明,利用该方法能很好地将合成地震记录中的P-P波和P-SV波分离.
분리P-P파화P-SV파최상용적시τ-p변환법,단시재τ-p역중,P-P파화P-SV파상유중첩부분,불능흔호분리.지진감탐중,당포검거소우계면심도시,P-P파화P-SV파적시거곡선방정도가근사위포물선방정.침대저충정황,제출료일충기우포물선방정적좌표랍신τ-p변환적P-P、P-SV파분리방법,해방법수선대지진기록연공간방향상진행좌표랍신,재진행τ-p정변환,재τ-p역중분리P-P파화P-SV파,기차대P-P파화P-SV파분별진행τ-p반변환,실현P-P파화P-SV파적분리.여상규τ-p변환법대비분석표명,이용해방법능흔호지장합성지진기록중적P-P파화P-SV파분리.
τ-p transform method is the most effective method for separating P-SV wave from P-P wave,but sometimes P-SV wave overlaps P-P wave and can not be separated completely in τ-p domain.When offset is shorter than interface depth in seismic exploration,the time-distance curve equations of P-SV wave and P-P wave can approximate to parabolic equations. Aiming at this situation,a method to separate P-SV wave from P-P wave by coordinate stretch τ-p transform based on parabolic equation is present. The authors process the seismic records by coordinate stretch along space direction and do τ-p transform at first, and then separate P-SV wave from P-P wave in τ-p domain, and inverse τ-p transform for P-SV wave and P-P wave respectively to separate P-SV wave from P-P wave finally. In contrast with normal τ-p transform, this method can separate P-SV wave from P-P wave completely and effectively.