煤体理化性质对其孔隙结构和甲烷吸附性能影响的研究进展
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摘要
煤层气主要成分为甲烷(CH_4),其主要以吸附态形式存在于煤层中。明确煤体理化性质和煤体孔隙结构及CH_4吸附性能间构效关系,对于高效开采CH_4资源至为关键。为此,本文阐明了煤体理化性质对其孔隙结构和CH_4吸附性能的作用规律,并指出了后续研究趋势。分析表明:煤体微孔结构和其CH_4吸附容量之间呈正线性相关性;煤体介/大孔主要影响CH_4在煤层内部的吸附/扩散速率。具有墨水瓶形孔或富含镜质体的煤体通常具有较强CH_4吸附性能。煤中矿物质和水分对煤体吸附性能产生不利影响。煤中小分子有机物的抽提能够提高煤体孔隙表面积和孔容积,进而提升煤体吸附性能。为了深入研究煤体理化性质及其吸附性能的作用规律,后续需开展以下工作:研究煤体孔隙结构参数和煤体吸附/解吸性能之间的耦合作用关系;利用多重分形理论精确揭示煤体内复杂的孔隙结构信息;优化并建立考虑煤体非均质性的BET和BJH等孔隙结构参数计算模型;以煤基质表面含氧官能团在煤体孔隙内部的赋存空间为切入点,阐明煤体官能团和孔隙结构对其CH_4吸附性能的协同作用规律;从理论模拟和实验科学入手,阐明煤层中水分对煤体孔隙结构的影响;建立更为科学的含水煤体吸附性能评价方法。
The coal-bed methane(CH_4) in coal reservoirs mainly exists in form of adsorbed state. Study on influences of physicochemical properties of coals on their pore morphology and CH_4 adsorption performance is important for effectively recovering CH_4. In this review, the influences of physicochemical properties of coals on their pore structure and CH_4 adsorption, and the future research trend were addressed. The results showed the positive linear correlation between coal micropore parameters and their CH_4 adsorption capacity. The meso-and macropores of coal mainly influenced the adsorption/diffusion rate of CH_4 within coals. The coals rich in ink-shaped pores or vitrinite always exhibited superior CH_4 adsorption performance. In general, the minerals and moisture decreased coal adsorption ability. The extraction of small organic compounds from coal matrix was helpful to increase pore surface area and volume of coals and further enhance their adsorption performance. To gain further insight into coal physicochemical properties dependences of pore morphology and CH_4 adsorption, the coupling relationship between coal pore structure parameters and fluid adsorption/desorption, and the elaboration of coal complex pore morphology based on multi-fractal theory were needed to study. Furthermore, to accurately estimate pore structure parameters of coal, the BET model and BJH model fully considering coal heterogeneity were needed. Study on occurrence space regarding oxygen-containing functional groups on coal matrix in coal pore space to address the cooperative effect of functional groups and pore morphology on CH_4 adsorption was also required. Finally, study on the influences of moisture on coal pore structure and adsorption performance for CH_4 from experiment and theory analysis, and experimental method for determining moisture-containing coal adsorption performance, should also be concentrated on.
The coal-bed methane(CH_4) in coal reservoirs mainly exists in form of adsorbed state. Study on influences of physicochemical properties of coals on their pore morphology and CH_4 adsorption performance is important for effectively recovering CH_4. In this review, the influences of physicochemical properties of coals on their pore structure and CH_4 adsorption, and the future research trend were addressed. The results showed the positive linear correlation between coal micropore parameters and their CH_4 adsorption capacity. The meso-and macropores of coal mainly influenced the adsorption/diffusion rate of CH_4 within coals. The coals rich in ink-shaped pores or vitrinite always exhibited superior CH_4 adsorption performance. In general, the minerals and moisture decreased coal adsorption ability. The extraction of small organic compounds from coal matrix was helpful to increase pore surface area and volume of coals and further enhance their adsorption performance. To gain further insight into coal physicochemical properties dependences of pore morphology and CH_4 adsorption, the coupling relationship between coal pore structure parameters and fluid adsorption/desorption, and the elaboration of coal complex pore morphology based on multi-fractal theory were needed to study. Furthermore, to accurately estimate pore structure parameters of coal, the BET model and BJH model fully considering coal heterogeneity were needed. Study on occurrence space regarding oxygen-containing functional groups on coal matrix in coal pore space to address the cooperative effect of functional groups and pore morphology on CH_4 adsorption was also required. Finally, study on the influences of moisture on coal pore structure and adsorption performance for CH_4 from experiment and theory analysis, and experimental method for determining moisture-containing coal adsorption performance, should also be concentrated on.
引文
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