摘要
随着煤炭开采深度的增大,矿井高温问题日益突出,因此必须对矿区的地温场特征进行研究.基于安徽淮北和淮南煤田煤系所测定的127块岩石样品的热导率数据,结合区内前人的研究成果,全面报道两淮煤田岩石热导率参数及其特征,并分析热导率对现今地温场的影响.结果表明:两淮煤田煤系岩石热导率变化范围为0.37-4.36W/(m·K),平均值为2.54W/(m·K);热导率与岩性、埋藏深度、地层时代和密度等密切相关,砂岩的热导率普遍大于泥岩和煤,热导率和深度、密度均表现为正相关关系;岩石导热性的差异对区内地温场的影响较大,导热性差的松散层和煤层往往会造成地温异常,且上覆松散层愈厚其地温愈高.
With the increase of coal mining depth, the problem of high temperature in mine becomes more andmore obvious. Therefore, it is necessary to study the geothermal field in mining area. Based on the results ofthermal conductivity of tested 127 rock samples of coal measure strata in Huainan-Huaibei coalfield and combiningthe previous measured data in the region, this paper reported the parameters and the characteristics of rock thermalconductivity in Huainan-Huaibei coalfield comprehensively and analyzed the influencing factors of thermalconductivity from different aspects. The results showed that the thermal conductivity of coal measure strata inHuainan-Huaibei coalfield ranges from 0.37 W/(m·K) to 4.36 W/(m·K) and the average is 2.54 W/(m·K). Thecorrelation between the thermal conductivity and lithology, buried depth, stratigraphic age and density is significant.The thermal conductivity of sandstone is generally greater than that of mudstone and coal. There is a positivecorrelation between thermal conductivity and depth, density. The differences of thermal conductivity of rocks havea big influence on the regional geo-temperature gradient, poor heat conductivity of unconsolidated layers and coalseam tends to cause ground temperature anomaly, and the thicker overlying unconsolidated layers, the higherground temperature.
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2014年第6期76-81,共6页
Coal Geology & Exploration
基金
国家自然科学基金项目(41272278)
安徽省国土资源科技项目(2011-K-13)
高等学校博士学科点专项科研基金项目(20123415110002)
关键词
热导率
特征
地温场
两淮煤田
thermal conductivity
characteristics
geothermal field
Huainan-Huaibei coalfield