Hydrocarbon Gases of the Gorevoi Utes Underwater Oil-Gas Seep (Lake Baikal, Russia)

被引:4
|
作者
Kalmychkov, G., V [1 ]
Egorov, A., V [2 ]
Hachikubo, A. [3 ]
Khlystov, O. M. [4 ]
机构
[1] Russian Acad Sci, Siberian Branch, AP Vinogradov Inst Geochem, Ul Favorskogo 1a, Irkutsk 664033, Russia
[2] Russian Acad Sci, PP Shirshov Inst Oceanol, Nakhimovkii Pr 36, Moscow 117997, Russia
[3] Kitami Inst Technol, 165 Koen Cho, Kitami, Hokkaido 0908507, Japan
[4] Russian Acad Sci, Limnol Inst, Siberian Branch, Ul Ulan Batorskaya 3, Irkutsk 664033, Russia
基金
日本学术振兴会;
关键词
hydrocarbon gases; methane; oil; Lake Baikal; NATURAL-GAS; METHANE; BOTTOM; BASIN;
D O I
10.15372/RGG2019110
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
We investigated the molecular and stable isotope compositions of hydrocarbon gases of the Gorevoi Utes oil-gas seep (Lake Baikal) characterized by a simultaneous discharge of oil and gas from the lake floor. It has been found that these hydrocarbon gases are mostly thermogenic methane (delta C-13-C-1 = -53.9 to -38.8 parts per thousand; delta C-13-C-2 = -23.4 to -33.3 parts per thousand). At the same time, the gases have a minor amount of C2+, seldom reaching 10%. The C-1/C2+ value varies from 9 to 2700, with the average value being 807, which is atypical of petroleum hydrocarbons. We suggest that degassing of oil leaking to the lake floor affects the molecular composition of such gases. Some secondary processes, primarily molecular fractionation of gas during its migration into the subsurface sediments and anaerobic biodegradation of methane homologues, contribute to the decrease in C2+ content.
引用
收藏
页码:1188 / 1194
页数:7
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