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针对新疆山前带地形起伏、表层结构复杂以及横向变速剧烈的特点,采用初至波波形反演方法进行表层速度精细建模。模型试算结果表明,该方法能够较好地重建近地表速度模型的细节部分;时间域波形反演方法的实现效果较大程度地依赖初始模型。正演模拟证明,表层对地震波传播的影响很大,倾角较大且横向变速剧烈的模型,正演模拟的精度、横向分辨率以及照明效果都会受到表层的影响,并且最终影响了反演结果的精度和分辨率。
Aiming at the characteristics of topographic undulation, complicated surface structure and severe lateral speed change in Xinjiang piedmont belt, the surface velocity is modeled finely by the first-arrival waveform inversion method. The experimental results show that this method can reconstruct the details of the near-surface velocity model well and the time-domain waveform inversion method depends more on the initial model. The forward simulation shows that the surface has great influence on seismic wave propagation, the model with large dip angle and drastic lateral velocity, the accuracy of forward modeling, lateral resolution and lighting effects are all affected by the surface layer, and finally affect the inversion results Accuracy and resolution.