| As the basis of the full waveform inversion,the residual between modeling records and field observation records is the objective function and to obtain the minimum value of the objective function through the iteration and to achieve inversion results ultimately.With the implementation of FWI method in multi domain,the method of velocity field refinement based on full waveform inversion has been constantly improved.In order to get more accurate information on the underground velocity field,more and more experts and scholars have paid more attention to how to elaborate the precision of the velocity field.This paper deduces wave equation of acoustic time domain and wave equation of acoustic frequency domain,meanwhile carrying out the forward modeling of acoustic model,which provides the theoretical basis of full waveform inversion.Then the theory of full waveform inversion of acoustic wave in time domain,frequency domain and Laplace-Fourier domain are derived,and the simulation of different models are carried out and the inversion effect is good.Based on the research of the velocity field refinement strategy of the full waveform inversion and combined with the existing research foundation,this paper proposes multi domain united FWI as the new velocity field refinement strategy.Through many trial and contrastive analysis of different models,ideal inversion result is obtained.FWI is still a hot spot of research,multi domain united FWI has also become a research trend in improving the accuracy of FWI in the future.At the same time,this paper also developed an interactive management platform for velocity field refinement based on the QT platform,a set of improved and expanded software development platform has been formed.Meanwhile we take the model test of stability of the software development platform from many aspects and the ideal test results are obtained.Finally we analyzed the existing problems and deployed the follow-up work. |
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