Full waveform inversion (FWI) is a process of data fitting using full wavefield, and low frequencies play a crucial role in the inversion process. However, in traditional seismic exploration, the frequency range of signals recorded by receivers is limited, which low frequencies cannot be recorded for some reasons, leading to FWI algorithms fall into local minima due to cycle skipping issue. We propose a wavefield phase correlation shifting (WPCS) method to improve cycle skipping issue of FWI, which can obtain a better inversion result without low frequencies compared with conventional FWI methods. Test of 2D frequency domain FWI based on Marmousi model shows that the result of inversion has a better result with WPCS method than conventional method.


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