Simulation of seismic waves in fluid-solid coupled thermoelastic media

Abstract

This research advances seismic wave propagation analysis by incorporating temperature effects within fluid-solid coupled media. Leveraging the Lord-Shulman theory, we develop propagation equations that apply thermoacoustic and thermoelastic concepts to the intricacies of fluid-solid-thermal coupled media. This method facilitates the energy exchange between different regions by using distinct wave propagation equations in various media and implementing appropriate boundary conditions at the interfaces. Subsequently, we use high-order staggered grids and formulate corresponding perfectly matched layer absorbing boundaries to enhance simulation accuracy and reduce computational demands. This approach is validated through two numerical examples and rock-physics experiments, highlighting the crucial influence of thermal variations on subsurface wave dynamics and the method’s effectiveness in synthesizing seismic records and simulating converted wave information. The results indicate that our method provides a new approach for analyzing seismic wave propagation characteristics in fluid-solid coupled environments with temperature variations.