通过对华北地区煤系地层不同岩性岩石的取样测试及数据整理,分析了煤系地层的岩石热导率特征。结果显示,岩石热导率受岩石矿物组成的影响,随泥质含量的增加,砂岩到砂质泥岩、泥岩、炭质泥岩、煤的热导率依次降低;煤的变质程度越高,热导率越大;岩石热导率一般随孔隙度的增大而减小。不同岩性的地层组合控制着地温场的垂向分布,低热导率岩层(如煤层、泥岩夹层)的地温梯度大,地层急剧升温,成为易发热害地层。因此,研究岩石热导率垂向变化规律是预测煤矿深部地温分布,确定煤矿易发热害层位的前提。

The features of coal-bearing strata thermal conductivity were analyzed through data reduction and testing for different lithology rock samples in coal-bea ring strata of North China.The results showed that rock thermal conductivity was controlled by mineral composition, the thermal conductivity of sandstone, sandy mudst one, mudstone, carbon mudstone and coal decreased in turn with the shale contents increased.The higher the degree of metamorphism was, the higher the thermal con ductivity would be.In addition, thermal conductivity decreased commonly while the porosity increased.Strata combination of different lithology could control the vertical g eotemperture distribution.In the strata with lower thermal conductivity, such as coal seam and mudstone, the thermal gradient would be high resulting in local high temp erature environment. Studying on the vertical variation law of thermal conductivity was the foundation to forecast geotempreture field of deep coal mine and ensure the h eat hazard position.

山东省优秀中青年科学家奖励基金资助项目(BS2012NJ014)；中央高校基本科研业务费专项资金资助项目(12CX04015A)；