Adsorption Behavior of Deep Coalbed Methane Under High Temperatures and Pressures
In order to analyze adsorption characteristics of deep coalbed, this paper studies the main coalbed of Eastern Ordos Basin and develops 4 groups of methane isothermal adsorption experiments of high pressure of the coal samples under different temperatures. By varying geological factors including temperature, pressure, and coal rank etc, we studied the adsorption characteristics under high temperatures and high pressures. Meanwhile, effects of geological factors on the adsorption behavior are analyzed by comparing results of different geologic factors, and the adsorption behaviors of deep coalbeds and shallow coalbeds. The results show that the adsorption characteristics of deep coalbeds is mainly influenced by temperature and pressure for deep coalbeds;The adsorption capacity of coal samples to CH4 is greatly reduced and the coal rank, coal macerals, ash content and moisture are less effective than the shallow coalbed on the adsorption property under high temperature conditions. So temperature and pressure become determinant factors in controlling the adsorption quantity. Adsorption capacities of the coal samples decrease along with the increase in pressure as the pressure reaches a certain value under 100℃according to the analyses, With the increase in pressure, the density difference of gas between the adsorbed phase and dissociative phase decreases gradually and Langmuir isothermal adsorption model is no longer applicable.
deep coalbed methaneadsorption characteristicshigh temperature and pressure
赵丽娟、秦勇、Geoff Wang、吴财芳、申建
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中国矿业大学 资源学院，徐州 221116
中国矿业大学 煤层气资源与成藏过程教育部重点实验室 徐州 221116
School of Chemical Engineering, University of Queensland, St Lucia QLD 4072, Australia
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