Gas isotope variation characteristics and genesis identification of coalbed methane in Yuwang Block

The research on the geochemical characteristics and genesis of coalbed methane (CBM) is of great significance to the formation and resource exploration-development. In order to investigate the genesis and geochemical characteristics of CBM in the Yuwang Block in eastern Yunnan, the gas samples from...

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Bibliographic Details
Published inMéitàn kēxué jìshù Vol. 52; no. 7; pp. 148 - 157
Main Authors Fangfang WANG, Caifang WU, Mingyang DU, Yiran TANG, Cong WANG, Dexiu WEN
Format Journal Article
LanguageChinese
Published Editorial Department of Coal Science and Technology 01.06.2024
Subjects
coalbed methane
genetic type
geochemistry
hydrocarbon isotope
yuwang block
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Summary:The research on the geochemical characteristics and genesis of coalbed methane (CBM) is of great significance to the formation and resource exploration-development. In order to investigate the genesis and geochemical characteristics of CBM in the Yuwang Block in eastern Yunnan, the gas samples from six typical CBM wells in the area were collected, and the composition determination, carbon isotope and rare gas isotope tests were carried out. The genesis of CH4, N2 and other gases in coal seam were systematically analyzed. Combined with the hydrogeological environment, the isotope variation of gases and their controlling factors during the CBM drainage process in Yuwang Block were investigated. The results shown that, the volume fraction of CH4 in the gas produced from CBM wells in the Yuwang Block averaged 73.95%-92.90%, and those of ethane, CO2 and N2 were 0.20% - 0.40%, 0.05% - 1.05% and 6.15% - 25.32%, respectively. In addition, helium was only detected on the first day of gas production, while hydrocarbons
ISSN:0253-2336
DOI:10.12438/cst.2023-1253