潘三井田煤系地层岩石热导率参数特征及大地热流研究

Study on Thermal Conductivity Parameters of Rock in Coal Measure Strata and Terrestrial Heat Flow in Pansan Coal Field

煤系地层岩石热导率是计算大地热流值的主要参数,也是评价地层热量传导特性的重要依据。基于潘三煤矿煤系地层所测定的77块岩石样品的热导率数据,结合区内前人的研究成果,全面分析了井田内岩石热导率参数特征并计算出大地热流值。研究结果表明:井田内煤系地层岩石热导率变化范围为0. 491～4. 583W/(m·K),平均值为2. 64W/(m·K),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。井田内平均大地热流值为73. 14mW/m^2,略高于安徽省大地热流平均值,呈现出较高的地热状态。

Thermal conductivity of rocks in coal measure layer is the main parameter to calculate the terrestrial heat flow value and the important basis for evaluating the characteristic of stratum heat conduction.Based on the results of thermal conductivity of the tested 77 rock samples from coal measure strata in Pansan Coal Mine and combining the previous measured data in this region,this paper studied the parameters and the characteristics of rock thermal conductivity in Pansan Coal Mine comprehensively and analyzed the influencing factors of thermal conductivity from different aspects.The results showed that the thermal conductivity of coal measure strata in Pansan Coal Mine ranged from 0.491W/(m·K)to 4.583W/(m·K),with the average being 2.64W/(m·K);the thermal conductivity of sandstone was generally greater than that of mudstone and coal;there was a positive correlation between thermal conductivity and depth,density;the average ground heat flux was 73.14mW/m^2 in the shaft area,slightly higher than the average value of terrestrial heat flow in Anhui Province,which presented a higher geothermal state.