基于时频误差分析法的随机介质波场特征分析

设计了含裂缝的随机介质模型和含随机介质的复杂盐丘构造模型,基于声波方程有限差分法,进行了波场快照及共炮点地震记录模拟;利用连续小波变换的时频误差分析方法,分析了与所给模型相同构造的各向同性介质模型的地震记录的时频振幅误差;统计分析了各道地震记录的时频特性,所得结果与利用连续小波变换的时频误差分析法吻合较好.表明时频误差分析法能为研究随机介质波场特征提供一种可行的思路.

Analysis of the wave field characteristics in random medium based on time-frequency error analysis

The random medium model containing cracks and the complex salt-dome structure model with the random medium model are designed.The wave field snapshots and the common source point seismic records are simulated based on the finite difference of the acoustic wave equations.The time-frequency amplitude error of the seismic record of the isotropic medium model with the same structure as the studied complex salt-dome structure model is analyzed using the time-frequency error analysis of continuous wavelet transform.The time-frequency characteristics of all channel seismograms are also analyzed by statistic method,which tally well with the time-frequency characteristics obtained by continuous wavelet transform.It is shown that the time-frequency error analysis method is a feasible method to the study of the wave field characteristics in random medium.