Abstract
The research on the propagation of seismic waves in anisotropic media is an important topic in the research of seismic exploration. In this paper, the optimal nearly-analytic discrete method of high precision and low dispersion was adopted in vertical transverse isotropic (VTI) medium of two-dimensional elastic wave equation numerical simulation. Based on the elastic wave equations in two dimensional VTI of the medium, the paper began with a discussion of the significance of the physical parameters of Thomsen, and then a different equation of elastic wave equation was established with the optimal nearly-analytic discrete method (ONAD). Finally, through the method of numerical simulation of a uniform and layered VTI model, the author focused on the research of snapshots and ground seismic records of different Thomsen parameters. In this paper, not only was the impact of the value of Thomsen parameters on the elastic wave propagation analyzed, but also the propagation laws of elastic wave in VTI medium were discussed, which have provided some reference and basis for practical seismic exploration.
Highlights
It is demonstrated in the study that most sedimentary rocks on the crust are showing seismic anisotropy [1] [2]
The optimal nearly-analytic discrete method of high precision and low dispersion was adopted in vertical transverse isotropic (VTI) medium of two-dimensional elastic wave equation numerical simulation
Based on the elastic wave equations in two dimensional VTI of the medium, the paper began with a discussion of the significance of the physical parameters of Thomsen, and a different equation of elastic wave equation was established with the optimal nearly-analytic discrete method (ONAD)
Summary
It is demonstrated in the study that most sedimentary rocks on the crust are showing seismic anisotropy [1] [2]. Numerical simulation technique in the seismic wave field is based on the theory of seismic wave propagation, simulating the propagation process of seismic wave in an underground media It is one of the important methods to study and understand the seismic anisotropy. The numerical simulation of the wave equation in the anisotropic medium has been developed rapidly all over the world and gradually improved in the 1980s [12]-[18] It includes methods such as pseudo-spectrum method and finite difference method. The two-dimensional elastic wave equation of VTI medium is simulated by this method
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