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GEOPHYSICAL RESEARCH LETTERS,
VOL. 35,
L04303,
5 PP., 2008
doi:10.1029/2007GL032429
Mesoscopic fluid flow simulation in double-porosity rocks
Institute of Seismic Exploration, Tsinghua University, Beijing, China
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, China
Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China
Institute of Seismic Exploration, Tsinghua University, Beijing, China
A discrete Fourier transform algorithm is designed to simulate mesoscopic fluid flow(MFF) in double-porosity rocks. Double-porosity equations with MFF are derived. Results from pseudo-spectral simulation show MFF transfers fast P waves and the first kind of slow P waves' energy to the second kind of slow P waves, and the Biot diffusive mode significantly attenuates the second kind of slow P waves' energy. We use a novel approach with a numerical grid method to solve the double-porosity wave equations. We conclude that the wavefield's attenuation should be attributed to a two-step mechanism: (1) MFF and (2) macroscopic Biot diffusion. Numerical estimations have shown that MFF in the double-porosity model can produce a high attenuation (0.32DB/10 m, 1/Q = 0.1083) in the seismic band (50 Hz).
Received 22 October 2007; accepted 31 December 2007; published 23 February 2008.
Citation: (2008), Mesoscopic fluid flow simulation in double-porosity rocks, Geophys. Res. Lett., 35, L04303, doi:10.1029/2007GL032429.
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