摘要Forward modeling of elastic wave propagation in porous media has great importance for understanding and interpreting the influences of rock properties on characteristics of seismic wavefield. However, the finite-difference forward-modeling method is usually implemented with global spatial grid-size and time-step; it consumes large amounts of computational cost when small-scaled oil/ gas-bearing structures or large velocity-contrast exist underground. To overcome this handicap, combined with variable grid-size and time-step, this paper developed a staggered-grid finite-difference scheme for elastic wave modeling in porous media. Variable finite-difference coefficients and wavefield interpolation were used to realize the transition of wave propagation between regions of different grid-size. The accuracy and efficiency of the algorithm were shown by numerical examples. The proposed method is advanced with low computational cost in elastic wave simulation for heterogeneous oil/gas reservoirs.
Abstract：Forward modeling of elastic wave propagation in porous media has great importance for understanding and interpreting the influences of rock properties on characteristics of seismic wavefield. However, the finite-difference forward-modeling method is usually implemented with global spatial grid-size and time-step; it consumes large amounts of computational cost when small-scaled oil/ gas-bearing structures or large velocity-contrast exist underground. To overcome this handicap, combined with variable grid-size and time-step, this paper developed a staggered-grid finite-difference scheme for elastic wave modeling in porous media. Variable finite-difference coefficients and wavefield interpolation were used to realize the transition of wave propagation between regions of different grid-size. The accuracy and efficiency of the algorithm were shown by numerical examples. The proposed method is advanced with low computational cost in elastic wave simulation for heterogeneous oil/gas reservoirs.
基金资助:the National Basic Research Program of China (No. 2013CB228604), the National Science and Technology Major Project (No. 2011ZX05030-004-002, 2011ZX05019-003) and the National Natural Science Foundation (No. 41004050)
通讯作者:
Xinxin Liu
E-mail: xxinl@126.com
引用本文:
Xinxin Liu, Xingyao Yin, Guochen Wu. Finite-difference modeling with variable grid-size and adaptive time-step in porous media[J]. 《地震学报》英文版, 2014, 27(2): 169-178.
Xinxin Liu, Xingyao Yin, Guochen Wu. Finite-difference modeling with variable grid-size and adaptive time-step in porous media. Earthquake Science, 2014, 27(2): 169-178.
