Application of FWI on onshore data in Bohai Bay Basin

The waveform inversion method based on full wave field is limited by the quality of seismic data. In practical application, due to the shortcomings of low signal-to-noise ratio at low frequency, short offset and large spatial variation of wavelet in onshore seismic data, the application of full waveform inversion in onshore data will generally face great challenges. This paper relies on the onshore data of Bohai Bay Basin to carry out acoustic full waveform inversion processing, including seismic data pre-processing, wavelet estimation and full waveform inversion iterative processing, and finally updates the velocity model of the subsurface shallow layer to obtain a velocity model that well matches the logging velocity, effectively improving the imaging quality of pre-stack depth migration.