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Property | Unit | Ottawa sand | Glass beads | Comment |
0. 5 mm | 1 mm | 2 mm |
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Modal grain radius (laser diffraction), | | | — | — | — | Using a Malvern Mastersizer 2000. |
Modal grain radius (image analysis), | | | | | | Image analysis using Sigma Scan 4. |
Modal grain radius (Hg injection), | | | — | — | — | Calculated from pressure data using Mayer-Stowe theory. |
D10 grain radius (sieving), | | — | | | | |
Effective pore radius, | | | | | | Using the method of Glover and Walker [12]. |
Effective pore throat radius, | | | | | | Using Glover and Déry [17], for random packing. |
Modal pore throat radius (Hg injection), | | | — | — | — | Using a Micromeritics AutoPore IV |
Porosity (gravimetry) | — | 0.314 | 0.383 | 0.380 | 0.382 | Please see text. |
Porosity (helium expansion) | — | 0.325 | 0.391 | 0.383 | 0.385 | Using a real gas expansion pycnometer. |
Porosity (mercury injection) | — | 0.304 | — | — | — | Using a Micromeritics AutoPore IV. |
Measured permeability, | m2 | | | | | The measured permeability at 5 Hz for the Ottawa sand and under steady-state conditions for the glass beads. |
Predicted permeability using the RGPZ method, | m2 | | | | | Permeability predicted from electrical data and the grain diameter using the method of Glover et al. [26]. |
Electrical conductivity, | S/m | | | | | For a 0.001 mol/L NaCl at 25°C. |
Electrical conductivity of the fluid, | S/m | | | | | Measured on the recycled fluid at the sample outlet after equilibration. |
Formation factor, | — | 4.676 | 4.13 | 4.18 | 4.16 | Calculated from the conductivities of the saturated rock and the saturating fluid. |
Connectedness, | — | 0.214 | 0.242 | 0.239 | 0.241 | Calculated from the formation factor [33, 34]. |
Cementation exponent, | — | 1.372 | 1.48 | 1.48 | 1.48 | Calculated from the formation factor. |
Electrical tortuosity, | — | 1.519 | 1.583 | 1.589 | 1.588 | Calculated from the porosity and . |
Theta factor, Θ | — | 3.705 | 3.53 | 3.57 | 3.55 | From the method of [12]. |
Predicted transition frequency, | Hz | 256.48 | 213.36 | 57.32 | 12.61 | At 24°C using the method of [19]. |
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