Based on Biot theory, the paper presented staggering grid finite-difference algorithm with any even-order precision of 3-C elastic wave e-quation in 2-D biphase dip anisotropic medium,and conducted simulation of elastic wavefield in homogeneous and two-layered biphase VTI and TTI media.

By using the forward modeling theory of elastic wave field in directionally-fractured medium, we have ascertained absorbing boundary condition of anisotropic medium,and synthesized the surface-seismic and VSP data which result from same geologic model but reflect different fracture properties (or density).