Time-domain single frequency waveform travel time inversion method independent of source wavelets

The invention relates to a time-domain single frequency waveform travel time inversion method independent of source wavelets. In view of the cycle skip phenomenon in full waveform inversion due to theloss of low-frequency components in seismic data, wave equation travel time inversion is carried out based on time-domain single frequency waveform, and a high-precision initial velocity model is constructed for conventional full waveform inversion, in order to solve the problem of cycle skip and obtain a high-precision full waveform inversion result. The invention aims to reduce the dependence of full waveform inversion on low-frequency components, avoid waveform mismatch caused by inaccurate source wavelets, and provide more technical support for full waveform inversion in practical application. The method greatly alleviates the cycle skip phenomenon in the full waveform inversion process, improves the inversion accuracy, and provides a high-precision initial velocity model for conventional full waveform invers