摘要
煤体结构是影响煤孔隙发育特征、煤层气赋存和运移行为的关键因素之一。为探究不同破坏程度煤微孔隙发育特征,采用扫描电镜对赵庄矿3号原生结构煤、碎裂煤、碎粒煤及糜棱煤等4种不同煤体结构类型煤的微孔隙进行了大量观测;基于扫描电镜观测资料,对煤微孔隙成因类型进行了划分,并对孔隙形态、孔隙连通性、孔隙大小及充填情况进行了系统研究。研究表明:赵庄矿3号煤中发育有原生孔、变质孔、矿物质孔及外生孔等4大类,胞腔孔、气孔、铸模孔、溶蚀孔、摩擦孔、角砾孔、碎粒孔等7小类不同成因类型微孔隙。不同煤体结构煤中微孔隙成因类型及发育程度有所不同,原生孔、变质孔及矿物质孔主要发育于原生结构和构造保存相对完好的原生结构煤和碎裂煤中,煤孔隙稳定性较好且孔隙形态相对规整;外生孔多发育于煤体结构破坏严重的碎粒煤和糜棱煤中,煤孔隙稳定性差且孔隙形态不规整;煤孔隙连通性整体较差且被碎屑物充填现象较常见;孔径大小不一,几千纳米至几十微米均有分布。
Coal structure is one of the key factors affecting coal pore development characteristics and coalbed methane occurrence and migration behavior.In order to explore the micro-pore development characteristics of coal with different degrees of damage,a large number of observations on micro-pores of four different coal structure types,such as primary structural coal,broken coal,broken coal and glutinous coal,from Zhaozhuang Coal Mine were carried out by using scanning electron microscopy.Based on the observation data of scanning electron microscopy,the genetic types of coal micro-pores were divided,and the pore morphology,pore connectivity,pore size and filling conditions were systematically studied.This study found that there were four types of primary pores,metamorphic pores,mineral pores and exogenous pores in No.3 coal seam of Zhaozhuang Coal Mine,and seven types of micro-pores with different genetic types,such as cellular pores,stomata,mold holes,dissolution holes,friction holes,brecciate holes and broken grains.The genetic types and developmental degrees of micro-pore in different coal-structured coals are different.The primary pores,metamorphic pores and mineral pores are mainly developed in original structure coal and fractured coal with relatively intact structure and structural preservation.Coal pore stability Better and relatively regular pore morphology.Exogenous pores are mostly developed in fragmented coal and xylonite coal with serious coal structure damage,and the pore stability of coal is poor and the pore morphology is irregular.Coal pore connectivity is generally low and filled with debris.The pore size varies widely from a few thousand nanometers to several tens of micrometers.
作者
杨昌永
常会珍
邵显华
郝春生
田庆玲
武杰
刘明杰
季长江
贾晋生
YANG Changyong;CHANG Huizhen;SHAO Xianhua;HAO Chunsheng;TIAN Qingling;WU Ji;LIU Mingji;JI Changjiang;JIA Jinsheng(State Key Laboratory of Coal and CBM Co-mining,Jincheng 048012,China;Yi’an Lanyan Coal and Coalbed Methane Co-mining Technology Co.,Ltd.,Taiyuan 030006,China)
出处
《煤炭科学技术》
CAS
CSCD
北大核心
2019年第12期194-200,共7页
Coal Science and Technology
基金
国家科技重大专项资助项目(2016ZX05067001-008)
山西省应用基础研究计划资助项目(2016012012)
关键词
不同煤体结构
结构分类
扫描电镜
微孔隙特征
different coal structures
classification of coal structure
scanning electron microscopy
micro-pore characteristics
作者简介
杨昌永(1981-),男,贵州铜仁人,硕士,工程师。E-mail:285356078@qq.com。
