时频误差分析法在地震信号分析中的应用

THE APPLICATION OF THE TIME-FREQUENCY REPRESENTATION TO SEISMIC SIGNAL ANALYSIS

时频误差分析法与常规的误差分析法相比,既能反映地震信号的振幅误差,也能区分其相位误差。通过连续小波变换的时频误差分析法,分析了平面地震波在复杂构造中含随机介质及其对应构造的各向同性介质模型中的共炮点合成地震记录的时频振幅误差和时频相位误差。研究结果表明,随机介质的振幅比各向同性介质的振幅衰减大,且随机介质的频率也较各向同性介质的频率为宽。

Compared to conventional error analytic methods, time-frequency representation can reflect the amplitude misfit and phase misfit of seismic signal. The continuous wavelet transformation was used to analyse the amplitude and phase misfits of the seismis signal of the common point＇s synthetic seismogram of the surface wave with the random medium model and the correspondant isotropic model. The resuits show more attenuation of the random medium amplitute than that of isotropic medium and wider frequency of the random than isotropic medium.