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This study investigates seismic wave propagation in high-temperature media, a key challenge in deep-ultra-deep oil and gas exploration. The Lord-Shulman thermoelastic model is extended by incorporating temperature-dependent material properties. Theoretical results reveal the presence of fast and slow longitudinal waves, as well as transverse waves, with the longitudinal waves exhibiting thermal dissipation and attenuation. Plane wave analysis shows a decrease in wave speed with increasing temperature, consistent with experimental data. A finite-difference method is used to compute wavefield snapshots, confirming that temperature-dependent material properties must be considered in wave propagation analysis of thermoelastic media.