山区纵、横波联合勘探的资料处理

Processing of seismic data collected in joint eompressional and shear wave explorations in mountainous district.

在四川山区,由于采用浅井激发横波,所以在记录上出现较强的相干干扰波,如声波、拉夫面波和浅层反射-折射多次波,严重地掩盖了有效反射波。此外,工区内地表地形及表层厚度、速度变化剧烈,静校正问题显得非常突出。鉴于这两种情况,资料处理的重点是作好二维滤波和静校正,而且更强调在叠前资料上作好这两项处理,并尽可能保持原有的相对振幅关系。为此,研制了一套适合四川山区碳酸盐岩储层的纵、横波资料处理流程及综合处理流程。综合处理流程主要用于提取纵、横波分层振幅比,全剖面纵、横波振幅比,纵、横波速度比及泊松比等信息。

In Sichuan mountainous district,useful reflections are often submerged in strong noise waves,such as acoustic wave,Love surface wave and shallow reflected- refracted multiples,which result from generating shear wave by shallow shot.The tough statics problem arises because of terrible variations in surface conditions, weathered layer thickness and weathered layer velocity.In view of the problems, two-dimensional filtering and static correction must be performed in data process- ing,particularly in prestack data processing,with original relative amplitude relation preserved as much as possible.Hence,we have developed the special and comprehen- sive processing flows for compressional and shear wave data from carbonate reser- voirs in Sichuan mountainous district.The comprehensive processing flow is mainly used to obtain P-wave amplitude/S-wave amplitude ratio for a layer,P-wave ampli- tude/S-wave amplitude ratio for a section,the ratio between P-wave velocity and S- wave velocity,Poisson's ratio.and so on.