Discussion on how the pore fissure development and coal metamorphic degree affected the coal reservoir permeability in a mining area in Pan County Guizhou Province
CHANG Xi-xi
Abstract：Based on that the coal reservoir permeability is the important factor to discuss whether a coal bed gas can be successful,combining with coal seam pore fissure development of mining area in Pan County of Guizhou,and from aspects such as partial coal seam porosity of research area,liquid nitrogen adsorption of multiple groups of coal samples and mercury injection experiment,morphology of rectangular mesh fracture of coal sample,pore development and coal petrography fracture morphology, how the pore fissure development degree affects the coal reservoir permeability rate was discussed.The effect of coal metamorphic degree on the coal reservoir permeability in Guizhou mining area showed that: along with the increase of vitrinite maximum reflectivity,the permeability and porosity reduced firstly and then increased obviously;coal petrography porosity of low rank coal seam was large,the permeability was high;with the increase of depth,the coal metamorphic degree would increase gradually,the permeability reduced;when the vitrinite maximum reflectivity was more than 2.5%,the coal seam porosity increased gradually,the permeability increased as well.
Keywords：coal reservoir permeabilitypore fissure developmentcoal metamorphic degreepermeabilityliquid nitrogen adsorptionmercury injection experimentvitrinite maximum reflectivitycoal petrography fissure form
Publication Date：2017-01-01
Pages：5( 21-24,28 )