1. State Key Lab for Geomechanics and Deep Underground Engineering , China Uninersity of Mining and Technology (ejing) , Bejing 100083, China;
2. School of Mechanics and Civil Engineering, China Unirersity of Mining and Technology (Bejing) ，Beijing 100083, China

为了探究深部含煤地层沉积岩的物性特征,通过对25个采自国内2个深部煤矿的6类沉积岩样品进行压汞试验分析,比较了不同种类、不同沉积环境沉积岩样品的孔隙结构参数及孔隙分布特征差异。结果表明,不同种类沉积岩样品代表性孔隙结构参数具有明显差异;各类岩石孔隙率随粒径范围的增大而增大;相同沉积环境条件下,不同种类沉积岩的孔径分布曲线有明显差异。总体看,泥岩孔容最小,孔径分布曲线较为平缓;砾岩孔容最大,孔径分布曲线坡度较大,与砂岩和泥岩相比,具有显著的S形分布特征。同时,不同种类岩石的优势孔隙存在明显差异。此外,不同沉积环境条件下,同一岩性深部煤系沉积岩样品的孔径分布曲线形状上有明显差异,孔隙分布特征差异较为显著。

In order to discover phy sical features of the sedimentary rockss in deep coal measures, mereury intrusion porosimetry expeni ments were conducted on 25 samples of six types of sedimentary rocks collected from two domestic deep coal mines. The differences in pore struc-ture parameters and pore distribution characteristics among sedimentary rock samples of different types and sediment ary environments were compared. The results showed that the representative pore structure parameters of different types of sedimentary rock samples have marked difference. The porosity of each type of rock increase with partice size range. Under the same sedimentary environment condition, the pore size distribution curves of the different types of sedimentary rocks have obvious difference. In general, the pore volumes of the mudstones are the smallest and their pore size distribution curves are flat. The pore volumes of the conglomerates are the largest and their pore size distribution curves are steeper. In comparison with the sandstones and mudstones, conglomerates have an evident S type pore distribution feature. Meanwhile, the dominant pores for different types of sedimentary rocks are quite different. In addition, under different sedimentary environment conditions, the pore size distribution curves of the sedimentary rock samples from the same lithological deep coal measures have obvious differences and the differences of their pore distibution features are remarkable.

国家自然科学基金青年科学基金资助项目(41502264)；高等学校博士学科点专项科研基金资助项目(20130023120016)；中央高校基本科研业务费专项基金资助项目(2010QL07)；