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Impacts from Tectonic Deformation on Coal Reservoir Pore Geometry and Specific Surface
Pages: 1-4,64
Year: Issue:  7
Journal: Coal Geology of China

Keyword:  ductile deformationspecific surfacetotal pore volumeprimary structural coaltectonoclastic coal;
Abstract:  Pore geometry and specific surface of coal can impact not only CBM adsorption, but also control gas percolation and diffusion. Through coal samples low-temperature nitrogen adsorption test of coal Nos.8 and 9 in the Luling coalmine, contrastively analyzed pore geometry and specific surface differences between primary structural coal and tectonoclastic coal with different deformation intensities. The result has shown that the average specific surface and total pore volume of tectonoclastic coal are 2.95 and 3.84 times larger than that of primary structural coal respectively. Along with the increasing of coal mass ductile deformation intensity, tectonoclastic coal spe-cific surface increased gradually, the ratio of micropore also increased, while small and medium pores decreased. Taking the mylonitic coal as the interfluve, variation of total pore volume presents a peculiarity of increased first then decreased.
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