Carbon Isotope Fractionation Behavior of Secondary Biogenic Coalbed Methane Generated from Lignite Samples Based on Parent Methanogen

Abstract:

Simulation experiments on biogenic coalbed methane were conducted under an anaerobic condition provided by an anaerobic glove chamber and using parent anaerobic methanogen. These experiments aimed to analyze the isotope fractionation behavior of secondary biogenic coalbed methane generated from the lignite samples collected from Zhaotong Basin, Yunnan Province, China. Results showed that the δ¹³C₁ values of the simulated biomethane varied from −52.31‰ to −58.41‰, which were in the normal distribution range compared with those of biogenic methane. Given the organic maceral in the parent rock, the methanogen used, and the biological generation pathway of CH4, δ¹³C₁ values continued to decrease as the simulation experiment proceeded. The carbon isotope ratio transferred from raw coals to biogenic methane in the simulation, indicating the significant relationship of source material inheritance. The fractional degree of δ¹³C₁ was probably controlled by the organic maceral component in coal, which was manifested by the positive correlation between δ¹³C₁ and humic matter content, as well as the negative correlation between δ¹³C₁ and inertinite content.

• Periodical: Advanced Materials Research (Volumes 1073-1076)
• Pages: 2005-2009
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1073-1076.2005
• Online since: December 2014
• Authors: Ai Kuan Wang*, Yong Qin, Pei Shao
• Keywords: Isotope Fractionation, Lignite, Parent Methanogen, Secondary Biogenic Coalbed Methane

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