Natural gas hydrates with locally different cage occupancies and hydration numbers in Lake Baikal
Kida, M.; Hachikubo, A.; Sakagami, H.; Minami, H.; Krylov, A.; Yamashita, S.; Takahashi, N.; Shoji, H.; Khlystov, O.; Poort, J.; Narita, H. (2009). Natural gas hydrates with locally different cage occupancies and hydration numbers in Lake Baikal. Geochem. Geophys. Geosyst. 10(Q05003): 8 PP. dx.doi.org/10.1029/2009GC002473 In: Geochemistry, Geophysics, Geosystems. American Geophysical Union: Washington, DC. ISSN 1525-2027; e-ISSN 1525-2027, more |  |
| Author keywords | cage occupancy; hydration number; methane; ethane; natural gas hydrate; Lake Baikal. |
| Authors | | Top | - Kida, M.
- Hachikubo, A.
- Sakagami, H.
- Minami, H.
| - Krylov, A.
- Yamashita, S.
- Takahashi, N.
- Shoji, H.
| - Khlystov, O.
- Poort, J., more
- Narita, H.
|
| Abstract | 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 CH4 to mixed gas hydrate containing up to 15% C2H6 are compared. The average hydration numbers are n = 6.1 for the sI CH4 hydrates recovered from the Malenky and Bolshoy mud volcanoes, n = 6.2 for the sI hydrates, containing 3–4% C2H6 recovered from the K-2 mud volcano, and n = 6.9 for the sII hydrate containing about 15% C2H6 recovered from the K-2 mud volcano. The differences in hydration number are due to the differences in the small cage occupancy of CH4 among the samples studied. |
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