On the effects of petrographic composition on coalbed methane sorption
On the effects of petrographic composition on coalbed methane sorption
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DOI：
10.1016/j.coal.2006.06.002
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发表时间：
2007-03-01
影响因子：
5.6
通讯作者：
Bustin, R. Marc
中科院分区：
文献类型：
--
作者：
Chalmers, Gareth R. L.;Bustin, R. Marc
测定了一组煤和富含有机质页岩的岩相组成对甲烷吸附能力的影响。用手工采摘的方法将亚烟煤和烟煤分成明亮和暗淡两种岩型。在6 Mpa压力下，甲烷的吸附容量在0.5~23.9 cm(3)/g之间。低挥发分烟煤和无烟煤的容量最高，而“天然焦”的容量最低。对于低阶煤，亮煤和暗煤之间没有显着差异，但有一种煤，暗煤的吸附能力比其亮煤大。对于煤阶较高的煤样，光亮煤样的甲烷容量大于暗色煤样，且煤样对之间的差异随着煤阶的增大而增大。在富脂质组煤样中，Boghead煤样的吸附能力最高，高于次烟煤和中挥发分烟煤。孔径分布表明，甲烷在富脂煤中以溶气形式存在，在贫脂煤中以物理吸附的形式存在于微孔中。这些不同的过程说明，富含脂质组的样品需要独立评估。在亚烟-中挥发烟煤中，活性惰质组的含量与甲烷吸附能力呈正相关，这是因为活性惰质组在结构上与镜质组相似，并且具有比非活性惰质组更高的微孔率。在暗色煤的煤层气研究中，应评估惰质组的反应性，以便更好地了解岩石组成对甲烷容量的影响。(C)2006爱思唯尔B.V.保留所有权利。
The effect of petrographic composition on the methane sorption capacity has been determined for a suite of coals and organic-rich shales. Subbituminous and bituminous coals were separated into bright and dull lithotypes by hand-picking. The methane sorption capacities range between 0.5 and 23.9 cm(3)/g at a pressure of 6 MPa. The low volatile bituminous Canmore coal and the anthracite sample have the highest capacities with the "natural coke" having the lowest. For low-rank coals there is no significant difference between bright and dull samples except for one coal with the dull sample having a greater sorption capacity than its bright equivalent. For higher-rank coals, the bright samples have a greater methane capacity than the dull samples and the difference between sample pairs increases with rank. The boghead coal samples have the highest sorption capacities in the liptinite-rich coals suite and are higher than subbituminous to medium volatile bituminous samples. Pore size distribution indicates that methane is held as solution gas in liptinite-rich coals and by physical sorption in micropores in liptinite-poor coals. These contrasting processes illustrate that liptinite-rich samples need to be independently assessed. The positive relationship between reactive inertinite content and methane sorption capacity occurs within the subbituminous to medium volatile bituminous coals because the reactive inertinite is structurally similar to vitrinite and have a higher microporosity than non-reactive inertinite. Reactivity of inertinite should be assessed in CBM studies of dull coals to provide a better understanding of petrographic composition effects on methane capacity. (C) 2006 Elsevier B.V. All rights reserved.