Wavefield propagation characteristics in the fracture-induced anisotropic double-porosity medium
裂缝诱导各向异性双孔隙介质波场传播特征

A fracture-induced horizontal transverse isotropic(HTI) double-porosity medium is studied in this paper. Based on theories of fracture-induced anisotropic media and two-phase media, constitutive equations are derived. Using the concept of continuous percolation, combining two sets of porosity and permeability, the equivalent porosity and equivalent permeability are given, then we obtain the motion equations. Furthermore, first-order velocity-stress equations are derived. Numerical simulations of elastic wave propagation are performed by the 2D high-order staggered-grid finite-difference, and the results show the effects caused by the double porosity systems of the medium on the wavefield propagation characteristics, which will lay a foundation of further studies on seismic wave propagation in actual earth media.