The impact of depositional environment and tectonic evolution on coalbed methane occurrence in West Henan, China

论文摘要

A deeper understanding of the mechanisms by which geological factors（depositional environment and tectonic evolution） control the occurrence of coalbed methane（CBM） is important for the utilization of CBM resources via surface-drilled wells and the elimination of coal-methane outbursts, the latter of which is a key issue for coal mine safety. Based on drill core data, high-pressure isothermal adsorption experiments, scanning electron microscopy experiments, mercury intrusion porosimetry, and X-ray diffraction experiments, the impact of the depositional environment and tectonic evolution on CBM occurrence of the II-1 coal seam of the Shanxi Formation in West Henan was analyzed. Results showed that the depositional environment led to the epigenetic erosion of tidal flat coal-accumulating structures by shallow-delta distributary channel strata. This resulted in the replacement of the original mudstonesandy mudstone coal seam immediate roof with fine-to-medium grained sandstones, reducing methane storage capacity. Epigenetic erosion by the depositional environment also increased coal body ash content（from 6.9% to 21.4%） and mineral content, filling the cleat system and reducing porosity, reducing methane storage capacity. The maximum methane adsorption capacity of the coal body reduced from35.7 cm3/g to 30.30 cm3/g, and Langmuir pressure decreased from 1.39 MPa to 0.909 MPa. Hence, the methane adsorption capacity of the coal body decreased while its capacity for methane desorption increased. Owing to the tectonic evolution of West Henan, tectonically deformed coal is common; as it evolves from primary cataclastic coal to granulitic coal, the angle of the diffraction peak increases, d002 decreases, and La, Lc, and Nc increase; these traits are generally consistent with dynamic metamorphism.This is accompanied by increases in the total pore volume and specific surface area of the coal body, further increasing the capacity for methane storage. Increases in micropore volume and specific surface area also increase the ability of the coal body to adsorb methane.

论文目录

文章来源

类型: 期刊论文

作者: Zhaodan Cao,Baiquan Lin,Ting Liu

来源: International Journal of Mining Science and Technology 2019年02期

年度: 2019

分类: 工程科技Ⅰ辑

专业: 石油天然气工业,矿业工程

单位: China University of Mining and Technology,Department of Energy and Mineral Engineering, The Pennsylvania State University, University Park

分类号: TD84

页码: 297-305

总页数: 9

文件大小: 574K

下载量: 24

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