Abstract
Elastic prestack reverse-time migration (RTM) can fully reveal underground information. The accuracy and efficiency of elastic RTM is strongly dependent on the algorithms used for numerical solutions of wave equations. Staggered-grid finite-difference (SFD) methods have been widely used to solve wave equations in RTM. Conventional SFD method derives spatial difference coefficients from space domain dispersion relation, but it is difficult to satisfy time-space domain dispersion relation of wave equations exactly. In this paper, we extend a time-space domain SFD method to elastic prestack RTM for improving image quality. We implement elastic prestack RTM using the conventional and the time-space domain high-order SFD methods, respectively. The modeling tests show that the elastic RTM using the time-space domain SFD method generates better images than that using the conventional SFD method. The application of the time-space domain SFD method to elastic RTM problems is preferable.
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