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极化分析方法在多分量地震资料处理中起着举足轻重的作用,当波形初至很接近时,利用常规的时间域极化分析方法刻画不同波型的极化分布就变得比较困难了.基于此,在广义S变换时频方法的基础上,实现了一种时频域瞬时极化滤波方法.该方法根据多分量信号的时频谱及瞬时相位来计算瞬时极化参数(极化轴、极化率、平面化向量等).结合了时频分析方法的优势,在波形识别方面更加准确.通过极化率可以识别并分离线性极化波和椭圆及圆形极化波,通过平面化向量与各分量之间的夹角大小,定性识别平面波和非平面波.模型勘探数据及实际三分量台站地震数据处理结果表明,时频域瞬时极化滤波方法在波场分离及非平面波压制等方面具有一定的实用性.
Polarization analysis plays a decisive role in the processing of multi-component seismic data, and when the initial waveform is very close, it becomes more difficult to characterize the polarization distribution of different wave patterns by the conventional method of time domain polarization analysis. Based on the generalized S-transform time-frequency method, an instantaneous polarization filtering method in time-frequency domain is realized, which calculates instantaneous polarization parameters (polarization axis, pole Combined with the advantage of time-frequency analysis method, more accurate in the waveform recognition.Polarization can be identified and separated by linear polarization and elliptical and circular polarization, through the plane Vector and the components of the angle between the size of qualitative identification plane wave and non-plane wave.The model exploration data and the actual three-component station seismic data processing results show that the time-frequency domain polarization filtering method in the wave field separation and non-plane wave suppression Has some practical aspects.