井间地震资料处理方法及效果

与常规的二维和三维地震相比，井间地震资料处理具有不同的特点。鉴于井间地震通常采用三分量观测，直达纵波在ｘ与ｙ分量上强，ｚ分量上弱；而直达横波在ｚ分量上强，在ｘ与ｙ份量上弱。所以在资料处理时，首先分离纵横波，然后分别实施；１．利用初至波放行时信息，通过层析反演，得到井间介质层速度空间分布剖面；２．对上行和下行的反射波进行类似于ＶＳＰ ＣＤＰ的专项处理，产生一个井间的反射波是归位成像剖面。

A new processing method for cross-borehole seismic data and its effect

The processing of cross-borehole seismic data is different from that of general2D and 3D seismic data. Cross-borehole seismic data are ususlly detected in three-component observation system,direct P-waves are strong in x and y components butweak in z component, and direct S-waves are strong in z component but weak in xand y components. In view of the facts,P-waves are first separated from S-waves indata processing. Then the fo1lowing measures are taken respectively:. Interval velocity section in cross-boreh0le medium can be derived from t0mo-graphic inversion of first break times.. Upgoing and downgoing reflection waves are processed in the way similar tothat for VSP CDP data processing,so that migration section of cross-borehole re-flection waves can be produced nicely.The processing results of real cross-borehole seismic data show that the pro-cessing method,including software and processing steps,can be used to bring b0thhigh-resolution tomographic results and reflection sections of cross-borehole seismicdata.