不同煤岩组合渗透率的影响因素试验研究  

Experimental Research on Influence Factors of Permeability of Different Coal-rock Combinations

作　　者：蒲钰昕 赵东 蔡婷婷[1,2] 袁钧 苏育飞[3] 常海明 PU Yuxin;ZHAO Dong;CAI Tingting;YUAN Jun;SU Yufei;CHANG Haiming(School of Engineering for Safety and Emergency Management,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;Key Laboratory of In-situ Property Improving of Ministry of Education,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;Shanxi Coal Geological Prospecting Institute,Taiyuan,Shanxi 030024,China)

机构地区：[1]太原理工大学安全与应急管理工程学院,山西太原030024 [2]太原理工大学原位改性采矿教育部重点实验室,山西太原030024 [3]山西省煤炭地质勘察研究院,山西太原030024

出　　处：《矿业研究与开发》2021年第12期88-98,共11页Mining Research and Development

基　　金：国家自然科学基金项目(51904197);山西省自然科学基金项目(201801D121283);山西省“1331”工程项目(2021);山西省煤炭地质局科技项目资助(202010).

摘　　要：为研究不同煤岩组合的渗透率,针对山西沁水盆地榆社武乡区块煤、粉砂泥岩和泥岩3种岩石的不同组合方式,进行了不同条件下的渗透率试验。结果表明:(1)在恒定孔隙压力下,随着有效应力的增加,渗透率先快速降低后缓慢降低,有效应力增大到使煤岩破碎后,渗透率会逐渐增加,趋势符合二次函数,恒定三轴应力下,渗透率随孔隙压力的增加呈二次函数曲线先降后升,2MPa为试验中的“临界压力”。(2)其他条件保持不变的情况下,含水率升高,渗透率呈负指数函数规律递减。孔隙压力一定时,三轴应力越高,煤岩渗透率受含水率升高的影响越大;三轴应力一定时,孔隙压力越高,煤岩渗透率受含水率升高的影响越大。(3)结合试验结果采用三维图直观分析,得到了有效应力和孔隙压力共同影响渗透率的图形,拟合出了有效应力和孔隙压力对渗透率的影响方程。研究结果为沁水盆地的煤层气资源高效开采提供了理论依据。In order to study the permeability of different coal-rock combinations,the permeability tests under different conditions were carried out for different combinations of coal,silty mudstone and mudstone in Yushe-Wuxiang County of Qinshui Basin,Shanxi Province.The results are concluded as follows.(1)Under constant pore pressure,as the effective stress increases,the permeability first rapidly decreases and then slowly decreases.After the effective stress increases until the coal is broken,the permeability will gradually increase,and the trend conforms to the quadratic function.Under constant triaxial stress,the permeability decreases first and then increases with the increase of pore pressure in a quadratic function curve,2MPa is the“critical pressure”in the test.(2)When other conditions remain unchanged,the water content increases,and the permeability decreases with a negative exponential function.When the pore pressure is constant,the higher the triaxial stress is,the more the coal permeability is affected by the increase of water content.When the triaxial stress is constant,the higher the pore pressure is,the more the coal permeability is affected by the increase of water content.(3)Combined with the test results,a three-dimensional graph is used to visually analyze the graph,which shows that the effective stress and pore pressure jointly affect the permeability,and fit influence equation of the effective stress and pore pressure to the permeability.The research results provide a theoretical basis for the efficient exploitation of coalbed methane resources in the Qinshui Basin.

关 键 词：煤岩组合 渗透率 有效应力 孔隙压力 含水率 

分 类 号：TD315[矿业工程—矿井建设]