摘要
Abstract
The coal measures of Longtan Formation in Xiaotun well field,Guizhou Province have the characteristics of large num-ber of coal seams,small spacing of coal seams and thin thickness of coal seams.Compared with single thick layer coal seam,multi-seam co-mining is prone to inter-layer interference,which affects co-mining effect and resource utilization degree.Based on the ana-lysis of the lithology and gas content of the borehole in Xiaotun well field,three types of coal-rock seam combinations,namely fa-vorable,more favorable and unfavorable,were identified,the thickness,depth of burial and gas content of each coal seam were ex-amined,the coal-bed methane resource conditions of each coal seam were compared,the storage combination,gas content,permeab-ility,reservoir pressure,ground stress and other factors were considered,and three sets of stacked coal-bed methane systems,I(6 up-per coal + 6 middle coal + 6 lower coal),II(7 coal)and III(33 coal + 34 coal),were divided.On the basis of this,we optimize the combination of production seams,and determine the orderly development mode to give priority to the upper production seam com-bination(6 upper coal + 6 middle coal + 6 lower coal),followed by the lower combination(33 coal + 34 coal),and finally consider the economic and time cost to determine whether to develop 7 coal alone.The optimized idea of coal-bed methane joint mining in multi-thin seam development area is established by analyzing the resource conditions,classifying the gas-bearing system and optim-izing the production layer combination.关键词
叠置煤层气系统/多煤层合采/解吸压力/产层组合/储层物性Key words
stacked coal bed methane system/combined mining of multiple coal seams/desorption pressure/production layer com-bination/reservoir physical properties分类
矿业与冶金
