Multi-Azimuth Three-Component Surface Seismic Modeling in Cracked Monoclinic Media

Abstract

The snapshots of the seismic wave propagation in monoclinic media are simulated using high-order staggered-grid finite-difference method. The monoclinic medium is a typical anisotropic model in fractured reservoir which includes two sets of non-orthorhombic vertical fractures in isotropic background and with different fracture infill. The modeling results show that the velocities of wave propagation in anisotropic models vary greatly in different directions, and the property of the fracture infill has a strong effect on velocity anisotropy. Then the axial rotation method is used in the modeling of multi-azimuth three-component surface seismic data in layered monoclinic media. The results illustrate that seismic velocities vary in directions not only with the polar angle, but also with the azimuth angle. Furthermore, the numerical modeling results may provide a theoretical basis for the inversion of anisotropic parameters and the fracture parameters by using the surface multi-azimuth seismic attributes.