Abstract
We present a new approach for estimating both high-resolution velocity and Q model through visco-acoustic full waveform inversion (Q-FWI). We first derive a new set of second-order visco-acoustic wave equations in the time domain to explicitly separate Q-induced phase dispersion with amplitude attenuation so that during wavefield back propagation, we would be able to compensate for the phase dispersion without altering the wavefield amplitude. We then verify the effectiveness of our phase-only Q-compensation approach through both forward modeling and reverse-time migration (RTM) imaging tests with a modified Marmousi model. The accuracy of our approach is additionally illustrated by the correct recovery of the strong Q anomaly through visco-acoustic waveform inversion. Finally, we propose a pragmatical inversion strategy for multiparameter Q-FWI with a real data example and show the success of our approach for both velocity and Q estimation.
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