Mesoscopic fluid flow simulation in double-porosity rocks

Details Mesoscopic fluid flow simulation in double-porosity rocks Mesoscopic fluid flow simulation in double-porosity rocks

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3504303b&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 4, CiteID L04303

Physics

Geophysics

4

Mathematical Geophysics: Wave Propagation (0689, 2487, 4275, 4455, 6934), Physical Properties Of Rocks: Wave Attenuation, Physical Properties Of Rocks: Fracture And Flow, Physical Properties Of Rocks: Permeability And Porosity

Scientific paper

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).

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