Elastic wavefield calculation for heterogeneous anisotropic porous media using the 3-D irregular-grid finite-difference
Elastic wavefield calculation for heterogeneous anisotropic porous media using the 3-D irregular-grid finite-difference
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DOI：
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发表时间：
2003
影响因子：
2.2
通讯作者：
Sun Weitao;Yang Hui-zhu
中科院分区：
文献类型：
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作者：
Sun Weitao;Yang Hui-zhu
Based on the first-order Biot-equation with simplified coefficients, a staggered irregular-grid finite difference method (FDM) is developed to simulate elastic wave propagation in 3-D heterogeneous anisotropic porous media. The 'slow' P wave in porous media wave simulation is highly dispersive. Finer grids are needed to get a precise wavefield calculation for models with curved interface and complex geometric structure. Fine grids in a global model greatly increase computation costs of regular grids scheme. Irregular fine or coarse grids in local fields not only cost less computing time than the conventional velocity-stress FDM, but also give a more accurate wavefield description. A dispersion analysis of the irregular-grid finite difference operator has confirmed the stability and high efficiency. The absorbing boundary condition is used to eliminate artificial reflections. Numerical examples show that this new irregular-grid finite difference method is of higher performance than conventional methods using regular rectangular grids in simulating elastic wave propagation in heterogeneous anisotropic porous media.
