频率域多尺度弹性波全波形反演

弹性波全波形反演对于多分量地震勘探的矢量波场处理具有重要研究意义。基于弹性波方程进行全波形反演能够充分利用多波多分量地震数据，获取地下多参数信息。针对弹性波波形反演具有强非线性性，局部寻优过程中容易陷入局部极值，采用频率域多尺度反演策略可以在一定程度上降低这一风险。将声波假设下的频率选择策略拓展到弹性波，并且为了避免离散频率逐级反演存在不稳定性问题，将频率划分为合适的频组，通过从低频到高频的逐频组反演可分别获取模型的低、中、高波数成分，减少陷入局部极值的可能性。模型试算结果表明，基于多尺度反演策略的弹性波全波形反演方法能够相对稳定地反演纵、横波速度信息，实现多参数反演。

 Elastic full waveform inversion is important for the vector wavefield processing of multi-component seismic exploration.The full waveform inversion based on the elastic wave equation can take full advantage of multi-wave and multi-component seismic data and obtain multi-parameter information.The multi-scale inversion algorithms in frequency domain can be used to weaken the nonlinearity of waveform inversion and the dependence of waveform inversion method to initial models.By appropriate selection of inversion frequency,the multi-scale inversion of low,intermediate and high wavenumber can be got respectively.The model test results show that the elastic full waveform inversion based on multi-scale inversion algorithms can get compression and shear wave velocity precisely and realize multi-parameter inversion.

国家自然科学基金(41204086，41374122)联合资助。