A Simulation Study on the Composition and Evolution of Thermogenic Coalbed Gas

• 责任者：Wu Baoxiang (Key Laboratory of Gas Geochemistry ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Lanzhou 730000 ; China) ; Duan Yi
• 刊名：Natural Gas Industry
• 出版年：2010
• 卷期：30(5)
• 关键词：煤层气 ; coalbed gas
• 页码：p.129-132
• 图表：3 illus., 1 table, 10 refs.
• 分类号：1003
• issnNo：ISSN1000-0976
• isbnNo：CN51-1179/TE

Through a pyrolysis experiment performed on the coal-forming peat under a closed system, the authors obtained the data of vitrinite reflectance (R_o) and the yield rates of gaseous products at different maturing periods, analyzed the relative percentage of main components in the simulated coalbed methane gas and how they change in the evolution process of organic matter maturity, and discussed the geological value of component analysis of the simulated coalbed methane gas. This simulation study discovered that with the increase of R_o, the relative percentage of the methane presents the increasing trend that of the CO₂ is in one-way decreasing trend, and that of the heavy carbon gases first increases and then declines.