两淮煤田煤系岩石热导率特征及其对地温场的影响.pdf

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1、第42卷第6期煤田地质与勘探Vol.42No.62014年12月COALGEOLOGY&EXPLORATIONDec.2014文章编号:1001-1986(2014)06-0076-06两淮煤田煤系岩石热导率特征及其对地温场的影响徐胜平，彭涛，吴基文，张海潮，任自强(安徽理工大学地球与环境学院，安徽淮南232001)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

2、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。关键词：热导率；特征；地温场；两淮煤田+中图分类号：TD727.2文献标识码：ADOI:10.3969/j.issn.1001-1986.2014.06.016Thecharacteristicsofrockthermalconductivityofcoalmeasurestrataa

3、ndtheirinfluenceongeothermalfieldinHuainan-HuaibeicoalfieldXUShengping,PENGTao,WUJiwen,ZHANGHaichao,RENZiqiang(SchoolofEarthandEnvironmental,AnhuiUniversityofScienceandTechnology,Huainan232001,China)Abstract:Withtheincreaseofcoalminingdepth,theproblemofhightemperatureinminebecomesmoreandmoreobvio

4、us.Therefore,itisnecessarytostudythegeothermalfieldinminingarea.Basedontheresultsofthermalconductivityoftested127rocksamplesofcoalmeasurestratainHuainan-Huaibeicoalfieldandcombiningthepreviousmeasureddataintheregion,thispaperreportedtheparametersandthecharacteristicsofrockthermalconductivityinHua

5、inan-Huaibeicoalfieldcomprehensivelyandanalyzedtheinfluencingfactorsofthermalconductivityfromdifferentaspects.TheresultsshowedthatthethermalconductivityofcoalmeasurestratainHuainan-Huaibeicoalfieldrangesfrom0.37W/(m·K)to4.36W/(m·K)andtheaverageis2.54W/(m·K).Thecorrelationbetweenthethermalconducti

6、vityandlithology,burieddepth,stratigraphicageanddensityissignificant.Thethermalconductivityofsandstoneisgenerallygreaterthanthatofmudstoneandcoal.Thereisapositivecorrelationbetweenthermalconductivityanddepth,density.Thedifferencesofthermalconductivityofrockshaveabiginfluenceontheregionalgeo-tempe

7、raturegradient,poorheatconductivityofunconsolidatedlayersandcoalseamtendstocausegroundtemperatureanomaly,andthethickeroverlyingunconsolidatedlayers,thehighergroundtemperature.Keywords:thermalconductivity;characteristic