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《Coal Science and Technology》 2017-09
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Mineral features of lignite in Erlian Basin and influences to pore structure

WANG Boyang;QIN Yong;SHEN Jian;WANG Gang;LI Jiuqing;School of Resource and Geosciences,China University of Mining and Technology;MOE Key Lab of Coal Bed Methane Resources and Reservoir Formation Process;School of Earth Science and Engineering,Hebei University of Engineering;  
In order to discuss the different mineral affected to the crack structure features of the lignite,with three large depression major lignite seams in Erlian Basin as the object,with the applications of the full rock and clay X-ray diffraction,scanning electron microscope,cryogenic adsorption,pressure mercury test and other analysis and test means,the mineral features and crack features of the samples were analyzed and the minerals affected to the crack structures were discussed. The results showed that the minerals of the lignite in the three depression major seams of Erlian Basin would be clay mineral and quartz mainly. Other mineral contents would be low. The clay minerals would be kaolinite mainly. The minerals mostly were the organic concomitants and were dispersedly distributed in the organics. In the study area,the lignite would have three types sorption and desorption delay curves and the distribution of the borehole volume would be the double peak development mainly. The fractal dimension would be 2.473 ~ 2.616. The fractal dimension of the adsorption borehole would be higher than the fractal dimension of the seepage borehole generally. The fractal dimension of the crack was mainly controlled by the adsorption borehole. The fractal dimension of the crack would have a negative correlation to the humus contents and clay minerals and would have a positive relationship to the inertinite contents,ash yield and quartz contents. The organic maceral and mineral contents of the coal would be affected to the crack fractal dimension and mainly depended on the humus contents and quarts contents individually.
【Fund】: 国家科技重大专项资助项目(2016ZX05041-001);; 国家自然科学基金重点资助项目(41530314)
【CateGory Index】: P618.13
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