Geological characteristics of coalbed methane and its accumulation significance in the Upper Permian in western Guizhou
Received date: 2021-12-31
Revised date: 2022-03-22
Online published: 2022-08-16
Supported by
The Sichuan Provincial Science and Technology Support Planning(2016JZ0037)
In order to study the geochemical characteristics, genetic types and hydrocarbon accumulation significances of coalbed methane in the Upper Permian in western Guizhou, the core testing data of 18 wells in Liupanshui, Bijie and Zunyi areas were collected and analyzed, including gas content, gas composition, stable isotope and isothermal adsorption. The results show that: the average gas content of coal is 14 m3/t and the average methane concentration of coal is 96.12%, revealing its obvious characteristics of dry gas. The δ13C1 (PDB) mainly ranges from -36‰ to -34‰, and increases with R O,max because of thermal fractionation of carbon isotope. According to the Whiticar’s discriminant chart, coalbed methane is mainly located in the thermal diffusion and migration fractionation zone. Compared with gas saturation, adsorption saturation (V/V L) can indicate coalbed methane preservation conditions and dispersion degree better, while it has a good negative correlation with δ13C1. The main mechanism is the analytical fractionation of coalbed methane carbon isotope, which can also explain synclinal-control theory of coalbed methane.
Xiaolin HU , Jianqiao WENG , Minghui QI , Xiangzhou ZENG , Xiaoying YANG , Yi HUANG . Geological characteristics of coalbed methane and its accumulation significance in the Upper Permian in western Guizhou[J]. Natural Gas Geoscience, 2022 , 33(8) : 1218 -1225 . DOI: 10.11764/j.issn.1672-1926.2022.04.001
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