三分量垂直地震剖面资料波场分离方法

SEPARATION OF WAVE FIELD FOR VERTICAL SEISMIC PROFILE DATA OF THREE COMPONENTS

三分量垂直地震剖面(VSP)资料波场的分离是将上行P波、S波.下行P波、S波(包括各类转换波).以及各种干扰波.按不同的能量关系记录在三个互相正交的分量上.形成了复杂的波场记录.本文在分析各种波场的基础上.综合利用上、下行波视速度的差异,以及P波、S波在极化特性和视速度两方面的差异.首先用极化滤波方法.最大限度地加强所期望的波.压制其它类型的波.再用速度滤波作进一步的波场分离.以期达到更好的分离效果.

The abundent wave field is one of the most outstanding characteristics of Vertical Seismic Profile (VSP) data in 3-component. P-waves (including converted waves) and other interference waves are recorded as three orthogonal components with different projective relations to form complicated records. On the basis of detailed analysis of the waves, the differences between P-waves and S-waves in both polarization and wave velocity are used. For efficient separation, polarization filtering is firstly used to enhance expected wave and suppress others, then velocity filtering is used for further wave field separation. The steps of separating P-waves and S-waves of 3-component VSP data are given. The field of 3-component VSP data are processed with these methods. The results are satisfactory.