Abstract
Micrometer-scale pore and fracture structures of coal seams are the crucial parameters for the adsorption of coalbed methane (CBM) and recovery. This paper deals with the microstructure’s influence on coal methane sorption behavior obtained from the Jharia Coalfield, India. Coal samples were collected from different seams to study the variability and heterogeneity of the reservoir parameters. Proximate and ultimate analysis of coal samples were determined to predict the rank of the coal. Microstructural parameters like pore size distribution, surface morphology, and infrared spectroscopy (FT-IR) were studied to predict the extent of gas sorption in the coal. The excess amount of methane sorption was determined using a volumetric method at 47 °C temperature and variable pressure. The identified pore volume varied from 0.2 to 3.07 m3/g. The surface morphology indicated inter- and intraparticle pores with spongy surfaces. The pore volume and surface morphology confirmed the favorable sorption of methane in coal samples. The FT-IR study showed the formation of hydrogen bond and methane sorption in coal. The maximum sorption capacity varied from 5.08 to 9.01 cc/g at 400 to 580 m depth. A strong, positive, and nonlinear correlation was observed with pore volume. The results showed that the presence of meso- and micropores and the spongy surface morphology are vital in defining its methane sorption capacity. As a whole, these coals have a higher porosity from 4.9 to 5.64% and meso- and micropores and are suitable for methane sorption.
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This study received financial assistance provided by SERB, DST, vide approval no: SB/S4/ES-697/2013.
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Kumar, H., Mishra, M.K., Mishra, S. et al. Determination of methane sorption capacity using microstructural analysis in coal of Jharia Coalfield, India. Arab J Geosci 14, 690 (2021). https://doi.org/10.1007/s12517-021-07051-0
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DOI: https://doi.org/10.1007/s12517-021-07051-0