![Figure 9: Attenuation estimates modelled using the periodic models of White [7], Johnson [8] and Pride et al [9]. Very good agreement between all approaches for the case of 5 % air inclusions in an otherwise water saturated host rock of porosity 15%. The inclusion radius is 25 cm.](/figures/figure-9-attenuation-estimates-modelled-using-the-periodic-1684suet.webp)
![Figure 13: Shows attenuation estimates of the CRM model and the periodic reference model of White [7] against the experimental data of Murphy [84]. The CRM models produce closer estimates of attenuation then does the reference periodic model.](/figures/figure-13-shows-attenuation-estimates-of-the-crm-model-and-35a1ygvc.webp)
Q2. What are the future works in "Comparative review of theoretical models for elastic wave attenuation and dispersion in partially saturated rocks" ?
However, further research is required to relate the parameters of natural fluid distributions ( both in the laboratory and field experiments ) to the parameters of random functions used in the model.
Q3. What is the proportionality coefficient of fluid flow between phases?
Fluid flow between phases is assumed to be proportional to the pressure difference, where the proportionality coefficient is frequency dependent.
Q4. What causes attenuation and phase velocity dispersion in biot media?
Wave attenuation and phase velocity dispersion within Biot type media is caused by global or macroscopic fluid flow, which is called “Biot loss”.
Q5. What is the reason for the mismatch between experimental measurements of attenuation and phase velocity?
Partial fluid saturation of porous rock by multiple types of pore fluids was first proposed as a cause for the mismatch between experimental measurements of attenuation and phase velocity dispersion, and theoretical predictions given by Biot theory [1-3].
Q6. What is the frequency dependency of wave velocity and attenuation in a partially saturated medium?
The frequency dependency of wave velocity and attenuation in a partially saturated medium is controlled by the size, shape and spatial distribution of fluid pockets and permeability and elastic moduli of the solid matrix as well as the properties of the two fluids.
Q7. What physics dictates fluid distribution on the mesoscale?
the same physics which dictates fluid distribution on the pore scale, such as minimization of interfacial surface area, between grains and fluids, and fluids and fluids will also determine fluid distribution on the mesoscale.
Q8. What is the main reason for the study of elastic wave propagation in partially fluid media?
Since then, the study of elastic wave propagation in partially fluid saturated media has become a field of interest in its own right, generating a number of experimental [25,33- 35], numerical [37-41] and theoretical studies designed to elucidate key features, which cause attenuation and phase velocity dispersion.
Q9. What is the way to describe the attenuation and phase velocity estimates of periodic and?
Providing the weak scattering conditions are met, there is good agreement between attenuation and phase velocity estimates for periodic and random distributions of fluid inclusions.
Q10. What is the way to describe the attenuation and phase velocity estimates of periodic and?
Providing the weak scattering conditions are met, there is good agreement between attenuation and phase velocity estimates for periodic and random distributions of fluid inclusions.
Q11. What is the central to the double-porosity dual-permeability theory?
Central to the double-porosity dual-permeability theory is a model for fluid transport between two poroelastic phases when induced fluid pressures are different.
Q12. What is the central to the double-porosity dual-permeability theory?
Central to the double-porosity dual-permeability theory is a model for fluid transport between two poroelastic phases when induced fluid pressures are different.
Q13. What is the permeability of the first bracketed term in the right-hand side?
In this case the first bracketed term in the right-hand side of (3) can be neglected [19] and the dynamic permeability reduces to the steady-state permeability κ , givingκω ηiq = .
Q14. What scale is the common for the distribution of fluid in the pore space?
Depending on the size of fluid clusters these gradients may occur on the pore scale or on the mesoscale (a scale that is larger than the pore size but smaller than wavelength scale).
Q15. What is the average attenuation behaviour of periodic and random distributions of fluid inclusions?
shows that the attenuation behaviour of periodic andrandom distributions of fluid inclusions is proportional to ω for low frequencies andproportional to 21−ω for high frequencies.