Structural Studies of Lake Baikal Natural Gas Hydrates

Structural Studies of Lake Baikal Natural Gas Hydrates

The structure of near-bottom gas hydrate samples obtained in Lake Baikal during the expeditions in 2005–2018 are reported. The hydrates contain mainly methane and ethane. More than 85% of the samples contain hydrate of cubic structure I ( sI ) with up to 4.2 mol.% ethane. The concentration of ethane...

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Bibliographic Details
Published in:Journal of structural chemistry Vol. 60; no. 9; pp. 1437 - 1455
Main Authors: Manakov, A. Yu, Khlystov, O. M., Hachikubo, A., Minami, Kh, Yamashita, S., Khabuev, A., Ogienko, A. G., Ildyakov, A. V., Kalmychkov, G. V., Rodionova, T. V.
Format: Journal Article
Language:English
Published: Moscow Pleiades Publishing 01-09-2019
Springer Nature B.V
Subjects:
Atomic
Atomic/Molecular Structure and Spectra
Chemistry
Chemistry and Materials Science
Ethane
Expeditions
Gas hydrates
Inorganic Chemistry
Molecular
Natural gas
Optical and Plasma Physics
Physical Chemistry
Sediments
Solid State Physics
Unit cell
Lake Baikal
Lake Baikal
natural gas hydrates
structure
powder diffraction
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Summary:The structure of near-bottom gas hydrate samples obtained in Lake Baikal during the expeditions in 2005–2018 are reported. The hydrates contain mainly methane and ethane. More than 85% of the samples contain hydrate of cubic structure I ( sI ) with up to 4.2 mol.% ethane. The concentration of ethane in the samples containing hydrate of cubic structure II ( sII ) is 12–14 mol.%. Refined unit cell parameters of natural hydrates are in good agreement with the data obtained in the studies of artificially synthesized hydrates. Possible mechanisms for the formation of sII hydrates are discussed. Some arguments are provided in favor of a probable presence of dispersed gas hydrates in the near-bottom layers of Baikal sediments and the possibility of small variations in the composition of hydrate gas in different hydrate fragments taken from the same hydrate layer.
ISSN:0022-4766
1573-8779
DOI:10.1134/S0022476619090087