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Raman spectroscopic and calorimetric observations on natural gas hydrates with cubic structures I and II obtained from Lake Baikal |
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| Authors: | Akihiro Hachikubo Oleg Khlystov Masato Kida Hirotoshi Sakagami Hirotsugu Minami Satoshi Yamashita Nobuo Takahashi Hitoshi Shoji Gennadiy Kalmychkov Jeffrey Poort |
| Institution: | 1. Kitami Institute of Technology, 165 Koen-cho, Kitami, 090-8507, Japan 2. Limnological Institute, SB RAS, 3 Ulan-Batorskaya St, Irkutsk, 664033, Russia 3. Methane Hydrate Research Center, National Institute of Advanced Industrial Science and Technology (AIST), 2-17-2-1 Tsukisamu-Higashi, Toyohira-ku, Sapporo, 062-8517, Japan 4. Vinogradov Institute of Geochemistry, SB RAS, 1-a Favorsky St, Irkutsk, 664033, Russia 5. Renard Centre of Marine Geology, Ghent University, Krijgslaan 281s8, 9000, Ghent, Belgium 6. Institut des Sciences de la Terre de Paris (ISTeP), Université Pierre et Marie Curie (UPMC Paris VI), Case courrier 129, 4 Place Jussieu, Paris cedex 05, 75252, France |
| Abstract: | This study reports measurements of the Raman spectra of Lake Baikal gas hydrates and estimations of the hydration number of methane-rich samples. The hydration number of gas hydrates retrieved from the southern Baikal Basin (crystallographic structure I) was approx. 6.1. Consistent with previous results, the Raman spectra of gas hydrates retrieved from the Kukuy K-2 mud volcano in the central Baikal Basin indicated the existence of crystallographic structures I and II. Measurements of the dissociation heat of Lake Baikal gas hydrates by calorimetry (from the decomposition of gas hydrates to gas and water), employing the hydration number, revealed values of 53.7–55.5?kJ?mol–1 for the southern basin samples (structure I), and of 54.3–55.5?kJ?mol–1 for the structure I hydrates and 62.8–64.2?kJ?mol–1 for the structure II hydrates from the Kukuy K-2 mud volcano. |
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