Table T8. Expected compositions of Structure I and Structure II gas hydrate formed from a source gas similar to that present below the BSR at Site U1328.
| Component | Source gas |
Structure I gas hydrate |
Structure II gas hydrate |
Void gas |
|---|---|---|---|---|
| Mole percent | ||||
| Methane | 99.987 | 99.96 | 99.82 | 99.971 |
| Ethane | 0.01 | 0.04 | 0.04 | 0.014 |
| Propane | 0.002 | 0 | 0.09 | 0.016 |
| i-butane | 0.001 | 0 | 0.05 | 0.01 |
| Molar ratios | ||||
| C1/C2 | 9998.7 | 2499 | 2495.5 | 7300 ± 1600 |
| C3/C2 | 0.2 | 0 | 2.25 | 1.20 ± 0.57 |
| i-C4/C2 | 0.1 | 0 | 1.25 | 0.73 ± 0.63 |
Notes: Compositions were calculated using the CSMHYD model of Sloan (1998) and assuming temperature and pressure conditions similar to those present near the projected BSR (15°C, 3.5% NaCl, and hydrostatic pressure). Void gas values are the observed data.
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