基于黔西比德—三塘盆地煤样工业分析、扫描电镜试验及压汞试验结果,研究了多煤层叠置独立含气系统下煤储层的孔隙特征。研究表明:比德—三塘盆地煤储层孔隙较为发育,孔隙率相对较高,以小孔和微孔为主,孔隙的连通性较好;研究区内煤层孔隙率与煤变质程度有明显的相关性,随煤阶增高,孔隙率呈现先增大后减小的趋势,在最大镜质组反射率约为3.00%时达到最大值;多煤层叠置独立含气系统内,在水公河向斜和三塘向斜,随着煤层埋深的增加,各煤层孔径先增大后减小,16号煤层是变化的节点,孔隙的连通性则先变差后变好;在珠藏向斜,各煤层孔径大小和孔隙的连通性都变化不大,推测是因16号煤层的煤样中充填了部分石英及黏土矿物,导致其总比孔容变小。

Based on analysis on the coal sample from Bide-Santang Basin in the West of Guizhou and the results of scanning electron microscopy experiments and the pressured mercury experiment, the pore features of the coal reservoir in the multiple superimposed independent gas-bearing system were studied.The study showe d that the pore of coal reservoir in the Bide-Santang Basin was developed and the porosity was relative high.The connection of the pore mainly with the small pore and micro pore was good.There was an obvious related relationship between the seam pore rate and the coal metamorphic degree in the study zone.With the coal rank incr eased, the porosity would be firstly increased and then reduced in tendency and would reach the max value when the transmission rate of the max vitrinite was about 3. 00%.In the multi superimposed independent gas-bearing system, in the Shuigonghe syncline and Santang syncline, with the seam depth increased, the pore diameter in each seam would be firstly increased and then reduced, No.16 seam was the variation node and the connection of the pore would be firstly poor and then good.In Zhuz ang syncline, there was less variation in the pore diameter size and pore connection of each seam.Due to some quartz and clay mineral backfilled in the coal samples fr om No. 16 seam, the total pore volume was reduced.

国家科技重大专项资助项目(2011ZX05034)；国家重点基础研究发展计划(973计划)资助项目(2009CB219605)；国家自然科学基金面上资助项目(41272178)；