Propagation of pore pressure diffusion waves in saturated dual-porosity media (II)

A mechanism has been established for pressure diffusion waves in dual-porosity media. Pressure diffusion waves are heavily damped with relatively low velocities and short wavelengths. The characteristic frequency dominates the attenuation behavior of pressure diffusions and separates wave fields int...

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Bibliographic Details
Published in:Journal of applied physics 2016-04, Vol.119 (15)
Main Authors: Yang, Duoxing, Li, Qi, Zhang, Lianzhong
Format: Article
Language:English
Subjects:
Applied physics
Delay
Delay time
Diffusion
Diffusion waves
Group velocity
Phase transitions
Porosity
Pressure dependence
Wave attenuation
Wave propagation
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Summary:A mechanism has been established for pressure diffusion waves in dual-porosity media. Pressure diffusion waves are heavily damped with relatively low velocities and short wavelengths. The characteristic frequency dominates the attenuation behavior of pressure diffusions and separates wave fields into two asymptotic regimes: relaxed and unrelaxed. Characteristic delay times control the pressure diffusion between the matrix and the fractures. The transition zones in wavelength and attenuation peak shift toward high frequencies when the characteristic delay time decreases. In contrast, the transition zones in both phase and group velocity shift toward low frequencies as the characteristic time of the delay increases. In a spatially dependent diffusivity field, the pressure diffusion waves in dual-porosity media obey an accumulation-depletion law.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4946832