基于压汞法探究岩浆侵入对煤孔隙的影响  

Influence of magmatic intrusion on the coal pore on the basis of mercury intrusion porosimetry

作　　者：宋播艺 宋党育[1,2] 李春辉[1] 袁镭 SONG Boyi;SONG Dangyu;LI Chunhui;YUAN Lei(Institute of Resource and Environment, Henan Polytechnic University, Jiaozuo 454000, China;Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Jiaozuo 454000, China;Datong Coal Group Company, Geological Exploration, Datong 037003, China)

机构地区：[1]河南理工大学资源与环境学院,河南焦作454000 [2]中原经济区煤层(页岩)气协同创新中心,河南焦作454000 [3]同煤集团地质勘测处,山西大同037003

出　　处：《煤田地质与勘探》2017年第3期7-12,共6页Coal Geology & Exploration

基　　金：国家自然科学基金项目(41172141);教育部新世纪优秀人才支持计划项目(NCET-10-0133);河南理工大学科技创新团队项目(T2013-2)~~

摘　　要：以平煤十三矿二1煤层中受岩浆侵入影响前后的贫瘦煤和无烟煤为研究对象,利用压汞法研究了热变质作用对煤中孔隙发育特征的影响。总结了压汞法测定煤中孔隙的实验原理以及煤中比表面积、孔容及其在不同孔径段分布的计算方法与过程,深入分析了不同样品孔容、比表面积的发育特征及其在不同孔径段的分布规律,并探讨了5.5 nm^350μm孔径范围内煤中孔隙的分形特征。研究表明:岩浆侵入致使煤中出现大量的新生孔隙,孔容和比表面积都显著增大,但中值孔容孔径、平均孔径减小,说明新生孔隙主要集中在小孔径段。而孔隙的空间分形维数变化规律表明岩浆侵入使煤中孔隙粗糙度增加,孔隙吸附能力增强,粒内孔分布范围增大。Taking the meager coal,lean coal and anthracite before and after the influence of magmatic intrusion in21coal seam of No.13coal mine of Pingdingshan Coal Mining Group as research objects,the mercury intrusion porosimetry(MIP)was used to study the influence of thermometamorphism on the development characteristics of pores of coal.The experimental principles of MIP,the calculation process of the total specific surface area and the total pore volume were summarized in detail.The distribution of pore volume and specific surface area in different aperture and the fractal dimension of pore between5.5nm and350μm were also discussed.The results show that many new pores were created due to magmatic intrusion,so the pore volume and the specific surface area increased significantly,while the median pore diameter and volume as well as the average pore diameter decreased,indicating that the new pores are mainly concentrated in the small aperture.The change rules of the fractal dimension indicate that the magmatic intrusion caused the enlargement of the roughness,the absorbability and distribution range of the intraparticle pore.

关 键 词：煤孔隙 压汞法 岩浆侵入 孔径分布 分形 

分 类 号：P618.11[天文地球—矿床学]