Encoded Simultaneous Sources Full-Waveform Inversion based on the phase rotation of wavefield in the time domain

Abstract

Encoding techniques are powerful strategies to speedup seismic inversion processes based on full-waveform inversion. In this work, we introduce a new simultaneous sources encoding strategy for time domain full-waveform inversion based on the phase rotation wavefield in the time domain constructed with help of the Hilbert transform. This encoding strategy consists in applying a random phase rotation to each shot gather. In addition, we combine our encoding scheme with restarted L-BFGS scheme. We have tested our scheme using synthetic data set from 2D SEG/EAGE overthrust model. In our tests, we have compared the effectiveness of our scheme with the conventional polarity encoding strategy. In this comparison, our scheme has shown to be more effective to mitigate the crosstalk noise than the polarity encoding strategy. Furthermore, our scheme showed an improvement of the convergence speed in comparison with polarity encoding.