Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 48, Issue 5, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020GL090558
Keywords
dispersion and attenuation; dynamic permeability; nuclear magnetic resonance; pore size distribution; ultrasound; wave; wettability
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Funding
- Jiangsu 100 Plan of Foreign Experts
- Australian Government Research Training Program (RTP) Scholarship
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Research has shown that the flow permeability of porous media is influenced by the pore size distribution, which is often ignored in traditional models. By developing a new dynamic permeability model that explicitly considers the pore size distribution, the impact of pore size distribution on permeability can be more accurately understood and utilized in permeability determination processes.
Probing the flow permeability of porous media with elastic waves is a formidable challenge, also because the wave-induced oscillatory motion renders the permeability frequency dependent. Existing theoretical models for such a dynamic permeability assume that the frequency dependence is primarily controlled by a single characteristic length scale of the pore space. However, the fact that in most natural porous media there exists a distinct range of pore sizes is ignored. To overcome this limitation, we develop a dynamic permeability model that explicitly incorporates the pore size distribution. We show that the pore size distribution has a first-order effect on the dynamic permeability. Since the pore size distribution can be deduced from techniques such as nuclear magnetic resonance, our results indicate the possibility to jointly use remote-sensing technologies for improved permeability determination and cross-fertilization of laboratory and in-field techniques.
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