地震信号的复地震道分析及应用

Complex seismic trace analysis of seismic signal and its application

复地震道分析又称三瞬分析,该分析方法可将反映地震信号局部变化情况的地震波的瞬时振幅、瞬时相位和瞬时频率等信息分离开.本文应用Hilbert变换求解虚地震记录,用复地震道分析方法求取"三瞬"信息,并用该方法计算了理论合成地震记录的瞬时振幅、瞬时相位和瞬时频率,获得了较好的效果.同时,本文也利用该方法对某区块实际地震资料进行了处理,结果表明,复地震道分析方法获得的"三瞬"信息可反映地震信号的局部变化,有助于进行地震薄互层分析,并能提高数据的解释精度.

Complex seismic trace analysis is also called three instantaneous analysis. It can separate instantaneous am plitude from instantaneous phase and instantaneous frcquency of seismic wave, and give local variations of seismic signal. Imaginary seismogram is obtained by Hilbert transform and three instantaneous information is obtained by complex seismic trace analysis method in this paper. The instantaneous amplitude, instantaneous phase and instantaneous frequency of theoretical synthetic seismogram are calculated and their effects are good. The actual data processing resuits show that the instantaneous information from the complex seismic trace analysis method not only reflects local variation of seismic signal, but also devotes to analysis of thin interbeds with seismic data, which can also improve interpretation accuracy.