Estimating the effects of pore geometry and pore fluid species on elastic wave velocity dispersion in rocks using microstructural models

1998 ◽  
Vol 29 (3-4) ◽  
pp. 361-367 ◽  
Author(s):  
Anthony L. Endres
Keyword(s):  
Elastic Wave ◽  
Wave Velocity ◽  
Velocity Dispersion ◽  
Elastic Wave Velocity ◽  
Pore Fluid ◽  
Pore Geometry

scholarly journals Research of the Elastic Wave Velocity Dispersion in X-Ray-Irradiated LiF Crystals

2013 ◽  
Vol 58 (10) ◽  
pp. 974-979 ◽  
Author(s):  
G.O. Petchenko ◽  
◽  
O.M. Petchenko ◽  
Keyword(s):  
Elastic Wave ◽  
Wave Velocity ◽  
Velocity Dispersion ◽  
Elastic Wave Velocity ◽  
X Ray

scholarly journals Experimental study on imaging hydraulic conductivity of rock masses based on elastic wave velocity dispersion

2009 ◽  
Vol 62 (3) ◽  
pp. 307-318 ◽  
Author(s):  
Kimitaka Yoshimura ◽  
Ken-ichi Ando ◽  
Susumu Sakashita ◽  
Patrick Bruines ◽  
Hirohumi Okumura ◽  
...  
Keyword(s):  
Experimental Study ◽  
Hydraulic Conductivity ◽  
Elastic Wave ◽  
Wave Velocity ◽  
Velocity Dispersion ◽  
Elastic Wave Velocity ◽  
Rock Masses

On the Transition from Homogeneous to Bubbling Fluidization

1997 ◽  
Vol 62 (11) ◽  
pp. 1698-1709
Author(s):  
Miloslav Hartman ◽  
Zdeněk Beran ◽  
Václav Veselý ◽  
Karel Svoboda
Keyword(s):  
Elastic Wave ◽  
Froude Number ◽  
Wave Velocity ◽  
Density Ratio ◽  
Elastic Wave Velocity ◽  
Solid Density ◽  
Archimedes Number ◽  
Group A ◽  
Experimental Findings

The onset of the aggregative mode of liquid-solid fluidization was explored. The experimental findings were interpreted by means of the dynamic (elastic) wave velocity and the voidage propagation (continuity) wave velocity. For widely different systems, the mapping of regimes has been presented in terms of the Archimedes number, the Froude number and the fluid-solid density ratio. The proposed diagram also depicts the typical Geldart's Group A particles fluidized with air.

scholarly journals Elastic wave velocity and electrical conductivity in a brine-saturated rock and microstructure of pores

2019 ◽  
Vol 71 (1) ◽  
Author(s):  
Tohru Watanabe ◽  
Miho Makimura ◽  
Yohei Kaiwa ◽  
Guillaume Desbois ◽  
Kenta Yoshida ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Elastic Wave ◽  
Wave Velocity ◽  
High Pressures ◽  
Seismic Velocity ◽  
Volume Fraction ◽  
Elastic Wave Velocity ◽  
Fluid Volume ◽  
Sem Observation ◽  
Wide Aperture

AbstractElastic wave velocity and electrical conductivity in a brine-saturated granitic rock were measured under confining pressures of up to 150 MPa and microstructure of pores was examined with SEM on ion-milled surfaces to understand the pores that govern electrical conduction at high pressures. The closure of cracks under pressure causes the increase in velocity and decrease in conductivity. Conductivity decreases steeply below 10 MPa and then gradually at higher pressures. Though cracks are mostly closed at the confining pressure of 150 MPa, brine must be still interconnected to show observed conductivity. SEM observation shows that some cracks have remarkable variation in aperture. The aperture varies from ~ 100 nm to ~ 3 μm along a crack. FIB–SEM observation suggests that wide aperture parts are interconnected in a crack. Both wide and narrow aperture parts work parallel as conduction paths at low pressures. At high pressures, narrow aperture parts are closed but wide aperture parts are still open to maintain conduction paths. The closure of narrow aperture parts leads to a steep decrease in conductivity, since narrow aperture parts dominate cracks. There should be cracks in various sizes in the crust: from grain boundaries to large faults. A crack must have a variation in aperture, and wide aperture parts must govern the conduction paths at depths. A simple tube model was employed to estimate the fluid volume fraction. The fluid volume fraction of 10−4–10−3 is estimated for the conductivity of 10−2 S/m. Conduction paths composed of wide aperture parts are consistent with observed moderate fluctuations (< 10%) in seismic velocity in the crust.

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