Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Characteristics and varieties of gases enclathrated in natural gas hydrates retrieved at Lake Baikal. / Hachikubo, Akihiro; Minami, Hirotsugu; Sakagami, Hirotoshi; Yamashita, Satoshi; Крылов, Алексей Алексеевич; Kalmychkov, Gennadiy; Poort, Jeffrey; Batist, Marc De; Manakov, Andrey; Khlystov, Oleg.
в: Scientific Reports, Том 13, № 1, 4440, 17.03.2023.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Characteristics and varieties of gases enclathrated in natural gas hydrates retrieved at Lake Baikal
AU - Hachikubo, Akihiro
AU - Minami, Hirotsugu
AU - Sakagami, Hirotoshi
AU - Yamashita, Satoshi
AU - Крылов, Алексей Алексеевич
AU - Kalmychkov, Gennadiy
AU - Poort, Jeffrey
AU - Batist, Marc De
AU - Manakov, Andrey
AU - Khlystov, Oleg
PY - 2023/3/17
Y1 - 2023/3/17
N2 - Molecular and stable isotope compositions of hydrate-bound gases collected from 59 hydrate-bearing sites between 2005 to 2019 in the southern and central sub-basins of Lake Baikal are reported. The δ2H of the hydrate-bound methane is distributed between − 310‰ and − 270‰, approximately 120‰lower than its value in the marine environment, due to the difference in δ2H between the lake water and seawater. Hydrate-bound gases originate from microbial (primary and secondary), thermogenic, and mixed gas sources. Gas hydrates with microbial ethane (δ13C: − 60‰, δ2H: between − 310‰ and − 250‰) were retrieved at approximately one-third of the total sites, and their stable isotope compositions were lower than those of thermogenic ethane (δ13C: − 25‰, δ2H: − 210‰). The low δ2H of ethane, which has rarely been reported, suggests for the first time that lake water with low hydrogen isotope ratios affects the formation process of microbial ethane as well as methane.Structure II hydrates containing enclathrated methane and ethane were collected from eight sites. In thermogenic gas, hydrocarbons heavier than ethane are biodegraded, resulting in a unique system of mixed methane-ethane gases. The decomposition and recrystallization of the hydrates that enclathrate methane and ethane resulted in the formation of structure II hydrates due to the enrichment of ethane.
AB - Molecular and stable isotope compositions of hydrate-bound gases collected from 59 hydrate-bearing sites between 2005 to 2019 in the southern and central sub-basins of Lake Baikal are reported. The δ2H of the hydrate-bound methane is distributed between − 310‰ and − 270‰, approximately 120‰lower than its value in the marine environment, due to the difference in δ2H between the lake water and seawater. Hydrate-bound gases originate from microbial (primary and secondary), thermogenic, and mixed gas sources. Gas hydrates with microbial ethane (δ13C: − 60‰, δ2H: between − 310‰ and − 250‰) were retrieved at approximately one-third of the total sites, and their stable isotope compositions were lower than those of thermogenic ethane (δ13C: − 25‰, δ2H: − 210‰). The low δ2H of ethane, which has rarely been reported, suggests for the first time that lake water with low hydrogen isotope ratios affects the formation process of microbial ethane as well as methane.Structure II hydrates containing enclathrated methane and ethane were collected from eight sites. In thermogenic gas, hydrocarbons heavier than ethane are biodegraded, resulting in a unique system of mixed methane-ethane gases. The decomposition and recrystallization of the hydrates that enclathrate methane and ethane resulted in the formation of structure II hydrates due to the enrichment of ethane.
UR - https://www.mendeley.com/catalogue/12fcaed4-a22e-3c5c-8418-cc84fdc46f17/
U2 - 10.1038/s41598-023-31669-7
DO - 10.1038/s41598-023-31669-7
M3 - Article
C2 - 36932173
VL - 13
JO - Scientific Reports
JF - Scientific Reports
SN - 2045-2322
IS - 1
M1 - 4440
ER -
ID: 113575707