School of Earth Sciences and Resources,China University of Geosciences(Beijing) School ofEnergy Resources,China University of Geosciences MOE Key Lab of Marine Reservo and Hydrocarbon Accumulation Mechanism,China University of Geosciences(Beijing)China United Coalbed Methane Corporation Limited

为了探讨沁水盆地南部柿庄地区15号煤层低渗透率的原因,以柿庄地区15号与3号煤层2层主采煤层的钻井和煤矿样品为研究对象,采用低温液氮、压汞测试、扫描电镜、显微镜观察、X射线衍射、全硫及形态硫分析等方法,并结合对钻井数据的分析,对控制15号煤渗透率的孔隙结构特征、孔隙-裂隙发育特征和煤中矿物发育特征等煤体因素和沉积环境、埋深等煤层赋存条件进行了对比研究。结果表明:15号煤层具有孔隙结构较差、裂隙-孔隙充填严重、煤中矿物较发育、灰分高,垂直应力较大等特征,以上特征是导致15号煤层渗透率较低的主要原因。

In order to discuss the low permeability cause of No.15 seam in Shizhuang Area at the south part of Qinshui Basin,based on the drling and mine samples from two major seams of No.15 seam and No.3 seam in Shizhuang Area as the study objects ,a cryogenic liquid nitrogen.,pressurized mercury test,scanning electron microscope,microscopy.X-ray difraction,total sulfur and morpholgical sulfur analysis as well as othermethods were applied to the comparison study on the pore structure features to control the permeability of No.15 seam,the pore-crack development features and mineral development features in coal and other seam factors as well as the sedimentary environment,buried depth and other seam formation conditions. The results showed that the pore structure of No.15 seam was poor and the porecrack was seriously backiled.The mineral development in coal high ash content,high vertical stress and other factors were the causes to make the low permeability of No.15 seam.

国家科技重大专项资助项目(2011ZX05042-001-002)；国家重点基础研究发展计划(973计划)资助项目(2014CB238900)；