Physical Properties of Hydrates and Ice
by Stephen Prensky, 1995
Summary of published values for properties of ice and pure gas hydrates (modified from Davidson, 1983).
| Property |
Ice |
Hydrate |
| Dielectric constant at 273 šK |
94 |
=58 |
| NMR rigid lattice 2nd moment of H2O protons(G2) |
32 |
33 ± 2 |
| Water molecule reorientation time at 273 šK (µsec) |
21 |
=10 |
| Diffusional jump time of water molecules at 273 šK (µsec) |
2.7 |
>200 |
| Isothermal Young's modulus at 268 šK (109Pa) |
9.5 |
=8.4 |
Speed of longitudianl sound at 273 šK
_velocity (km/sec)
_transit time (µsec/ft) |
3.8
80 |
3.3
92 |
| Velocity ratio Vp/Vs at 272 šK |
1.88 |
1.95 |
| Poisson's ratio |
0.33 |
=0.33 |
| Bulk modulus (272 šK) |
8.8 |
5.6 |
| Shear modulus (272 šK) |
3.9 |
2.4 |
| Bulk density (gm/cm3) |
0.916 |
0.912 |
| Adiabatic bulk compressibility at 273 šK 10-11Pa |
12 |
=14 |
| Thermal conductivity at 263 šK (W/m-K) |
2.23 |
0.49 ± 0.02 |
Ý '=' symbol of hydrate column of this table is wavy 'nearly equal' symbol in Prensky (1995).
References:
- Davidson, D., 1983, Gas hydrates as clathrate ices, in Cox, J., ed., Natural gas hydrates--properties, occurrence and recovery: Butterworth, Woburn, MA, p.1-16.
- Prensky, S.E., 1995, A review of gas hydrates and formation evaluation
of hydrate-bearing reservoirs (paper GGG), presented at1995 meeting of the Society of Professional Well Log Analysts, Paris, France, June 26-29.
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