Natural gas hydrates with locally different cage occupancies and hydration numbers in Lake Baikal
Résumé
[1] Knowledge of cage occupancies and hydration numbers (n) of naturally occurring gas hydrate in a local environment is important for the improvement in global estimates of hydrate-bound natural gas. We report on local differences in cage occupancies and hydration number of gas hydrates from Lake Baikal. Natural gas hydrates of both structures I and II (sI and sII) and ranging in composition from pure CH 4 to mixed gas hydrate containing up to 15% C 2 H 6 are compared. The average hydration numbers are n = 6.1 for the sI CH 4 hydrates recovered from the Malenky and Bolshoy mud volcanoes, n = 6.2 for the sI hydrates, containing 3-4% C 2 H 6 recovered from the K-2 mud volcano, and n = 6.9 for the sII hydrate containing about 15% C 2 H 6 recovered from the K-2 mud volcano. The differences in hydration number are due to the differences in the small cage occupancy of CH 4 among the samples studied.
Domaines
Minéralogie| Origine | Fichiers éditeurs autorisés sur une archive ouverte |
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