煤的孔隙分布特征研究理论与方法综述
Review on research theory and methods of pore distribution characteristics of coal
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摘要: 煤的孔隙分布特征不仅直接影响着煤层中瓦斯的赋存与运移能力,还直接影响着煤氧之间物理吸附与化学反应的发展进程。因此,深入研究煤的孔隙分布特征有利于对煤储层进行合理的分类评价,进而研究分析煤层瓦斯储存运移规律及煤低温氧化反应机制,提高瓦斯含量预测准确度及瓦斯抽采效率,细微描述煤自然发火过程。通过调研大量的相关文献,系统总结了目前煤的孔隙分布特征研究理论和方法,并对各种研究理论和方法进行对比分析,指出了各自的优势及不足,提出了下一步可从微孔隙的准确测量以及全尺度合理表征、煤孔隙的微观效应研究、建立精确的煤介质模型3个方向开展研究。Abstract: The pore distribution characteristics of coal not only directly affect the gas storage and migration ability in coal seam, but also directly affect the development process of physical adsorption and chemical reaction between coal and oxygen. Therefore, in-depth study of the pore distribution characteristics of coal is conducive to the reasonable classification and evaluation of coal reservoirs, and then study and analyze the laws of gas storage and migration in coal seams and the low-temperature oxidation reaction mechanism of coal, improve the accuracy of gas content prediction and gas extraction efficiency, and describe the process of coal spontaneous combustion in detail. We have systematically summarized the current research theories and methods of pore distribution characteristics of coal through a large number of relevant literature investigations, and compared and analyzed various research theories and methods, pointed out their respective advantages and disadvantages. Finally, it is proposed that the next step can be carried out from three directions: accurate measurement of micro-pores and reasonable characterization at full scale, research on microscopic effects of coal pores, and establishment of accurate coal medium models.
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