Statistics – Methodology
Scientific paper
Apr 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012geoji.189..481s&link_type=abstract
Geophysical Journal International, Volume 189, Issue 1, pp. 481-492.
Statistics
Methodology
Microstructures, Permeability And Porosity, Fracture And Flow, Wave Propagation, Acoustic Properties
Scientific paper
For the first time, a comprehensive and quantitative analysis of the domains of validity of popular wave propagation theories for porous/cracked media is provided. The case of a simple, yet versatile rock microstructure is detailed. The microstructural parameters controlling the applicability of the scattering theories, the effective medium theories, the quasi-static (Gassmann limit) and dynamic (inertial) poroelasticity are analysed in terms of pores/cracks characteristic size, geometry and connectivity. To this end, a new permeability model is devised combining the hydraulic radius and percolation concepts. The predictions of this model are compared to published micromechanical models of permeability for the limiting cases of capillary tubes and penny-shaped cracks. It is also compared to published experimental data on natural rocks in these limiting cases. It explicitly accounts for pore space topology around the percolation threshold and far above it. Thanks to this permeability model, the scattering, squirt-flow and Biot cut-off frequencies are quantitatively compared. This comparison leads to an explicit mapping of the domains of validity of these wave propagation theories as a function of the rock's actual microstructure. How this mapping impacts seismic, geophysical and ultrasonic wave velocity data interpretation is discussed. The methodology demonstrated here and the outcomes of this analysis are meant to constitute a quantitative guide for the selection of the most suitable modelling strategy to be employed for prediction and/or interpretation of rocks elastic properties in laboratory-or field-scale applications when information regarding the rock's microstructure is available.
No associations
LandOfFree
Impact of pore space topology on permeability, cut-off frequencies and validity of wave propagation theories does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Impact of pore space topology on permeability, cut-off frequencies and validity of wave propagation theories, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Impact of pore space topology on permeability, cut-off frequencies and validity of wave propagation theories will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1116648