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| Finite-difference modeling with variable grid-size and adaptive time-step in porous media |
| Xinxin Liu, Xingyao Yin, Guochen Wu |
| College of Geosciences, China University of Petroleum, Qingdao 266580, China |
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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.
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Received: 29 July 2013
Published: 18 January 2014
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| Fund: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) |
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Corresponding Authors:
Xinxin Liu
E-mail: xxinl@126.com
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