Abstract
At high frequency, the time scale is very short and acceleration becomes important. There must be a pressure difference in the main pores to drive fluid acceleration, which as a side effect is capable of inducing a reverse squirt in the throat connecting two pores. Based on such a mechanism, we develop a novel model of an S wave in fluid-saturated rock, which yields phase velocity (Vs) and the quality factor (Qs) as functions of frequency. Applications of the new model to Berea sandstone and Boise sandstone yield throat permeability. The second porosity represented by throats appears to be 5% of the total porosity. Nonetheless, Qs is predicted as 106 at a frequency of 10 Hz, far higher than seismic Qs measured in the field. This may be because groundwater has softened the skeleton of sedimentary rocks and/or because internal reflections at multiple lithological interfaces attenuate seismic waves.
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Data Availability
The data yielded from the model are available with https://doi.org/10.6084/m9.figshare.14493768 at https://figshare.com/s/b35b063cf723574c902b.
Abbreviations
- a :
-
Length of main pore
- b :
-
Length of throat
- \(c_{{\text{s}}}\) :
-
S-wave velocity in undrained rock (\(c_{{\text{s}}} = \sqrt {\frac{G}{\rho }}\))
- \(c_{{{\text{s0}}}}\) :
-
S-wave velocity of skeleton (\(c_{{{\text{s0}}}} = \sqrt {\frac{G}{{\rho_{{\text{s}}} }}}\))
- f :
-
Frequency
- G :
-
Shear modulus of skeleton
- k :
-
Wavenumber
- k D :
-
Darcy permeability
- k 1 :
-
Local permeability of S wave in main pore
- k 2 :
-
Local permeability of S wave in throat
- P p1 :
-
Fluid pressure in main pore
- P p2 :
-
Fluid pressure in throat
- q 1 :
-
Darcy flux rate in main pore
- q 2 :
-
Darcy flux rate in throat
- Q E :
-
Quality factor of FOM
- Q p :
-
Quality factor of P wave
- Q s :
-
Quality factor of S wave
- t :
-
Time
- u :
-
Shear displacement
- v :
-
Lagrangian velocity of solid
- V s :
-
S-wave velocity
- x :
-
Direction of Lagrangian motion
- y :
-
S-wave direction
- \(\phi\) :
-
Total porosity
- \(\phi_{1}\) :
-
Local porosity in main pore
- \(\phi_{2}\) :
-
Local porosity in throat
- \(\mu\) :
-
Fluid dynamic viscosity
- \(\omega\) :
-
Angular frequency
- \(\omega_{{\text{C}}}\) :
-
Characteristic angular frequency
- \(\Omega\) :
-
Dimensionless angular frequency
- \(\rho\) :
-
Total density (\(\rho = \rho_{{\text{s}}} + \phi \rho_{{\text{f}}}\))
- \(\rho_{{\text{f}}}\) :
-
Fluid density
- \(\rho_{{\text{s}}}\) :
-
Skeleton density
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Acknowledgements
The research was sponsored by the National Natural Science Foundation of China under Grants 42064006 and 41873075. The authors would like to thank sincerely the Editor and two anonymous reviewers for their positive comments and constructive suggestions.
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Li, G., Liu, Y. & Liu, S. S-Wave Attenuation Due to Fluid Acceleration. Pure Appl. Geophys. 179, 1159–1172 (2022). https://doi.org/10.1007/s00024-022-02989-y
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DOI: https://doi.org/10.1007/s00024-022-02989-y