淮北煤田现今地温场特征及大地热流分布

淮北煤田的高温热害问题愈发突出，但目前对该区系统的地温场特征及大地热流分布研究非常稀少.在系统分析淮北煤田大量地面钻孔井温测井数据和井下巷道围岩温度测试数据的基础上，结合72块岩石样品的热导率测试结果，全面阐述了该区现今地温梯度和大地热流的分布特征.研究表明:淮北煤田现今地温梯度众值介于1.80~2.80 ℃/100 m之间，平均地温梯度为2.42 ℃/100 m；大地热流值变化范围为39.52~74.12 mW/m2，平均热流值为55.72 mW/m2，地温梯度和热流值均低于同处华北板块的其他盆地以及南部的淮南煤田；大地热流受地温梯度控制明显，两者分布较为相似，整体表现为南高北低、西高东低的特点.结果表明，区内现今地温场和热流分布主要受区域地质背景和区内构造格局的控制. 

Distribution Characteristics of Current Geothermal Field and Terrestrial Heat Flow in Huaibei Coalfield

The problem of high temperature in Huaibei coalfield is going to be more and more terrible, however, the research on the characteristics of geothermal field and the distribution of terrestrial heat flow in this region is extremely rare. On the basis of systematical analysis of temperature logging data of surface boreholes and the tested data of temperature of surrounding rock of underground roadway in Huaibei coalfield, combining the tested results of thermal conductivity of 72 rock samples, the current geothermal gradient and terrestrial heat flow in this region are comprehensively expounded. The study shows that the mode of current geothermal gradient in Huaibei coalfield is between 1.80 and 2.80 ℃/100 m and the average is 2.42 ℃/100 m. The terrestrial heat flow value ranges from 39.52 to 74.12 mW/m2 and the average is 55.72 mW/m2. The geothermal gradient and the terrestrial heat flow value are lower than those in Huainan coalfield and other basins in North China. Terrestrial heat flow is controlled by geothermal gradient obviously. The variation of geothermal distribution is similar to the distribution of geothermal gradient and it shows as a whole that the temperature in the south is higher than that in the north and the temperature in the west is also higher than that in the east. The analysis shows that the distribution of current geothermal field and heat flow in the region is mainly controlled by regional geological background and regional tectonic framework.