Estimating Pore Space Hydrate Saturation Using Dissociation Gas Evolution Measurements: In Relevance to Laboratory Testing of Natural or Artificially Synthesised Hydrate-Bearing Soil Specimens

Table 1

References for experimental determination of hydrate number, 𝑛_𝑘.

Reference	Temperature/pressure conditions	Hydrate number	Remarks
Handa, 1986 [41]	253.0 ± 0.5 K; 3.40 ± 0.10 Mpa	6.00	Determines hydrate number for bulk hydrate using gas evolution measurements upon dissociation
Handa and Stupin, 1992 [42]	263.0–276.2 K; 2.64–5.26 Mpa	5.94	Determines hydrate number for hydrate formed within 70 Å silica gel-pores
Sum et al., 1997 [43]	273.65–276.65 K; at corresponding three phase equilibrium pressure	6.04 ± 0.03	Determines the hydrate number over a range of temperatures for bulk hydrate at corresponding three phase equilibrium pressure
Uchida et al., 1999 [44]	273.2–278.4 K; 3.0–7.0 Mpa	6.2 ± 0.2	Determines the hydrate number for bulk hydrate over a range of temperatures and pressures
Seo et al., 2002 [45]	274.15 K; 10.0 Mpa	6.00	Determines the hydrate number for bulk hydrate at the given temperature and pressure
Circone et al., 2005 [46]	263–285 K; 1.9–9.7 Mpa	5.99 ± 0.07	Determines an average hydrate number along the three-phase equilibrium boundary for bulk methane hydrate using gas evolution measurements upon dissociation over a range of temperatures and pressures
Galloway et al., 1970 [47]	283–288.5 K; 7.10–13.17 Mpa	5.84–6.34	Determines the hydrate number with ±15.6% average maximum relative uncertainty over a range of temperatures and pressures