煤的吸附—解吸特性及其煤相控制

发布时间：2018-04-26 10:30

本文选题：煤层柱状 + 煤相　；参考：《中国矿业大学》2015年硕士论文

【摘要】：采集山西古交矿区西曲井田2号、4号、9号煤层柱状样,分析了煤相对煤吸附-解吸性的控制特征。采用Q型聚类分析,参考GI-TPI图解,识别出5种煤相类型。煤相呈旋回式和跳跃式演化,显示泥炭沼泽覆水条件具有脉动式的变化特征。采用Langmuir模型和D-A模型拟合吸附数据,讨论了不同煤相煤吸附甲烷特性的异同。采用Langmuir模型和Weibull模型拟合解吸数据,讨论了不同煤相煤对甲烷的解吸特性。研究认为:起源于草本植物的煤比木本植物的煤对甲烷的吸附能力更强,原始结构孔隙保存好的显微组分对甲烷的吸附和解吸都有利。研究发现:障壁岛-泻湖低位沼泽相(A)吸附能力最弱,解吸能力较强,解吸率中等;障壁岛-泻湖森林沼泽相(B)吸附、解吸能力均较强,解吸率最高;下三角洲平原低位沼泽相(C)吸附能力强,解吸能力较差,解吸率最低;上三角洲平原潮湿森林沼泽相(D)吸附、解吸能力都较强,解吸率较高;上三角洲平原干燥森林沼泽相(E)吸附能力很差,解吸能力较弱,解吸率较低。结合成煤植物类型、孔隙结构、灰分产率等参数,进一步讨论了造成煤相上述吸附-解吸性差异的地质原因。最终认为,2号煤层的第2-Ⅳ阶段和9号煤层产气条件有利,4号煤层的煤层气开采条件差。
[Abstract]:The columnar samples of coal seams No. 2, No. 4 and No. 9 in Xiqu Mine Field of Gujiao Mining area, Shanxi Province, were collected, and the control characteristics of coal relative to coal adsorption and desorption were analyzed. Five types of coal facies were identified by using Q cluster analysis and GI-TPI diagram. The evolution of coal facies is cyclic and leaping, which shows that the conditions of peat swamp have pulsating variation. The adsorption data were fitted by Langmuir model and D-A model, and the similarities and differences of methane adsorption characteristics of different coal phases were discussed. Langmuir model and Weibull model were used to fit the desorption data, and the desorption characteristics of methane from different coal phases were discussed. The results show that the methane adsorption ability of the coal originated from herbaceous plants is stronger than that of woody coal, and that the microscopic components preserved in the original pore structure are beneficial to the adsorption and desorption of methane. The results show that the adsorption ability of barrier island-lagoon low marsh phase A) is the weakest, the desorption capacity is relatively strong, and the desorption rate is medium, the barrier island-lagoon forest marsh phase has the highest desorption capacity and the highest desorption rate. The lower delta plain has strong adsorption ability, poor desorption ability and the lowest desorption rate, and the upper delta plain has higher desorption capacity and higher desorption rate. In the upper delta plain, the adsorption ability of dry forest and marsh phase E) is very poor, the desorption ability is weak, and the desorption rate is low. Combined with the parameters of coal-forming plant type, pore structure and ash yield, the geological reasons for the difference of adsorption-desorption properties of coal facies are discussed. Finally, it is concluded that the gas production conditions of No. 2 coal seam and No. 9 coal seam are favorable, and the coal bed methane mining conditions of No. 4 coal seam are poor.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.1

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