摘要
本文根据地震波视速度和偏振特性,导出波场分离矩阵是视慢度p和波速V_p、V_s的函数。由于波速是空间坐标函数,因此,在带有空间坐标的数域与带有视慢度参数户的数域(如时—空域与τ-p域、频—空域与f-k域)相互变換,可实现变速视慢度波场分离。文中还给出了使用τ-p变换法、f-k变换法和DRT法实现变速视慢度波场分离的三种具体方法。采用变速视慢度波场分离方法时,速度函数可采用零井源距直达波的速度或声波测井资料换算的速度。在进行纵、横波分离的同时,可对视慢度p限定不同范围,实现上、下行波的波场分离及f-k滤波、τ-p滤波等。
By applying seismic apparent velocity and polarization property in derivation, we come to the conclusion that the wave field separation matrix is the function of apparent slowness p,wave velocities Vp and Vs. Wave velocity is function of spatial coordinates;therefore,interconversion between the numerical domain having spatial coordinate and the numerical domain having apparent slowness p(such as time-spatial domain and τ-p domain, or frequency-spatial domain and f-k domain) can be made to achieve wave field separation using apparent slowness of variable velocity. We describe three methods in which wave field separation using apparent slowness of variable veloccity is achieved with the aid of τ-p transform,f-k transform or discrete Radon transform (DRT) respectively. The velocity of zero-offset VSP direct wave, or the velocity derived from acoustic log data, can be taken as the variable velocity in the wave field separation. Furthermore, different values of apparent slowness p can be used to separate P-wave from S-wave,to part upgoing wave field from downgoing wave field, and to perform f-k filtering, τ-p filtering, etc.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
1993年第4期418-429,共12页
Oil Geophysical Prospecting
关键词
地震波
波场分离
视慢度
偏振
wave field separation
apparent slowness
polarization
algorithm
VSP interpretation
