Progress in the frequency-domain full waveform inversion method

The full waveform inversion (FWI) method utilizes the kinematic and dynamic information of prestack seismic data to rebuild underground velocity structure.It has the potential of revealing detailed structure and lithology characteristics under complex geological background.FWI can be carried out in the either frequency or time domain. Frequency-domain FWI has the advantages of high computation efficiency and data selection flexibility over its time-domain counterpart.Recent advances in frequency-domain FWI including waveform modeling methods,frequency selection strategies,object function configuration styles,source wavelet processing methods,and gradient precondition methods make it attractive for realistic problems.The multiple local minimal nature of the object function js one of the major obstacles to good reflection waveform inversion results.The frequency-domain damped wavefield inversion method fills the gap between the Laplace-domain and frequency-domain FWI methods.The combination of the three methods can mitigate the strong nonlinearity of the waveform inversion problem.