首页|Study on the evolution of solid-liquid-gas in multi-scale pore methane in tectonic coal
Study on the evolution of solid-liquid-gas in multi-scale pore methane in tectonic coal
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The rich accumulation of methane (CH4) in tectonic coal layers poses a significant obstacle to the safe and efficient extraction of coal seams and coalbed methane. Tectonic coal samples from three geologically complex regions were selected,and the main results obtained by using a variety of research tools,such as physical tests,theoretical analyses,and numerical simulations,are as follows:22.4-62.5 nm is the joint segment of pore volume,and 26.7-100.7 nm is the joint segment of pore specific surface area. In the dynamic gas production process of tectonic coal pore structure,the adsorption method of methane molecules is"solid-liquid adsorption is the mainstay,and solid-gas adsorption coexists". Methane stored in micropores with a pore size smaller than the jointed range is defined as solid-state pores. Pores within the jointed range,which transition from micropore filling to surface adsorption,are defined as gaseous pores. Pores outside the jointed range,where solid-liquid adsorption occurs,are defined as liquid pores. The evolution of pore structure affects the methane adsorption mode,which provides basic theoretical guidance for the development of coal seam resources.
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