榆神矿区隆德煤矿侏罗系岩层微观孔隙结构及分形特征研究  

Study on Micropore Structure and Fractal Characteristics of Jurassic Strata in Longde Coal Mine of Yushen Mining Area

作　　者：王二利 霍高普 李振林[2] 边佳新 WANG Erli;HUO Gaopu;LI Zhenlin;BIAN Jiaxin(Shaanxi 185 Coal Field Geology Co.,Ltd.,Yulin,Shaanxi 719000;College of Coal and Chemical Industry,Shaanxi Energy Institute,Xianyang,Shaanxi 712000;School of Water and Environment,Chang’an University,Xi’an,Shaanxi 710054)

机构地区：[1]陕西省一八五煤田地质有限公司,陕西榆林719000 [2]陕西能源职业技术学院煤炭与化工产业学院,陕西咸阳712000 [3]长安大学水利与环境学院,陕西西安710054

出　　处：《中国煤炭地质》2024年第5期13-20,共8页Coal Geology of China

摘　　要：岩层的微观孔隙结构决定其自身的渗透性,并影响着矿井涌水量的大小,提前研究岩层的微观孔隙结构对矿井水害防治具有重要意义。以隆德煤矿侏罗系岩层为研究对象,通过现场采样、X-射线衍射、CT扫描、压汞试验等方法,研究了岩层的微观孔隙结构;基于分形理论、系统聚类分析等方法,划分了孔隙结构类型。结果表明:隆德煤矿侏罗系岩层矿物成分主要包括石英、长石、碳酸盐,含量44.1%~90.9%,构成了主体骨架,胶结物含量6.1%~34.3%;岩层的平均粒径101.80~203.82μm,连通孔隙度3.41%~20.60%,顶部以及底部的孔隙度较大,中间部分的孔隙度小,孔隙结构的复杂程度一般。根据系统聚类法将侏罗系岩层的微观孔隙结构划分为三类,从Ⅰ~Ⅲ类,孔喉半径、孔隙度、渗透率及分选系数依次减小;排驱压力、相对分选系数及中值压力依次增大;储存地下水的能力依次减小,富水性依次减弱。研究成果从微观角度上为矿井疏放水工程施工靶区的圈定提供了理论依据,对矿井水害防治具有积极的指导意义。The micropore structure of rock layers determines their own permeability and affects the size of mine water inflow.It is of great significance to study the micropore structure of rock layers in advance for the prevention and control of mine water hazards.Taking the Jurassic strata of Longde coal mine as the research object,the micropore structure of the strata was studied through on-site sampling,X-ray diffraction,CT scanning,mercury intrusion testing,and other methods.Based on fractal theory,systematic clustering analysis and other methods,pore structure types were classified.The results show that the mineral composition of the Jurassic rock layers in Longde Coal Mine mainly includes quartz,feldspar,and carbonate,with a content of 44.1%~90.9%,forming the main framework,and a content of 6.1%~34.3%in cement.The average particle size of the rock layer ranges from 101.80~203.82μm.The connectivity porosity is 3.41%~20.60%,with higher porosity at the top and bottom,and lower porosity in the middle.The complexity of the pore structure is average.According to the system clustering method,the micropore structure of Jurassic rock layers is divided into three categories.From Class I to Class III,the pore throat radius,porosity,permeability,and sorting coefficient decrease sequentially.The displacement pressure,relative sorting coefficient,and median pressure increase sequentially.The ability to store groundwater and the water richness decreases in sequence.The research results provide a theoretical basis for delineating the construction target area of mine drainage engineering from a micro perspective,and have positive guiding significance for the prevention and control of mine water hazards.

关 键 词：矿井水害防治 微观孔隙结构 分形理论 榆神矿区 

分 类 号：P58[天文地球—岩石学]