Acoustic numerical simulation for VTI media

The generality to anisotropy of the earth media can be proved by a lot of research and observation,which is shown by the elastic parameters of the seismic wave changes with the direction of propagation.Actually,computational efficiency is very low,when simulating on the elastic anisotropic media,for the complicated and multi-parameters computation,which becomes a disadvantage to the succeeding migration and imaging procedure.Using acoustic approximation in the VTI media is an advisable simplification for the elastic wave simulation in that setting S-velocity into zero can greatly reduce the computational amount as well as get the same simulation effect.The authors get an acoustic approximation formula,then gain an anisotropic wave equation with 2-order in time and 4-order in space by inverse Fourier transformation,and dispel with the dispersion by adopting the high order finite difference operator in space and remove the edge reflection using the absorption attenuation boundary.Finally,the feasibility and effectiveness of this algorithm can be proved by the snaps and synthetic records.

The generality to anisotropy of the earth media can be proved by a lot of research and observation, which is shown by the elastic parameters of the seismic wave changes with the direction of propagation. Actually, computational efficiency is very low, when simulating on the elastic anisotropie media, for the complicated and multi-parameters computation, which becomes a disadvantage to the succeeding migration and imaging pro-cedure. Using acoustic approximation in the VT[ media is an advisable simplification for the elastic wave simu-lation in that setting S-velocity into zero can greatly reduce the computational amount as well as get the same simulation effect. The authors get an acoustic approximation formula, then gain an anisotropic wave equation with 2-order in time and 4-order in space by inverse Fourier transformation, and dispel with the dispersion by adopting the high order finite difference operator in space and remove the edge reflection using the absorption attenuation boundary. Finally, the feasibility and effectiveness of this algorithm can be proved by the snaps and synthetic records.