AN ANALYSIS ON THE PRINCIPAL CONTROL FACTOR OF COAL RESERVOIR PERMEABILITY iN CENTRAL AND SOUTHERN QINSHUI BASIN,SHANXI

According to measurement and statistics of down coal mine macrofractures were classified into four ranks,and systemically described and measured under scan electron microscope. Based on the analysis of relationship between permeability and ground stress/buried depth, fractures, reservoir pressure, hydrogeological condition, authors point out that ground stress/buried depth is principal-control factor. Under the same buried depth other factors play more important role on permeability.