淮北煤田现今地温场特征及大地热流分布
Distribution Characteristics of Current Geothermal Field and Terrestrial Heat Flow in Huaibei Coalfield

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℃／ｈｍ之间，平均地温梯 度为２．４２℃／ｈｍ；大地热流值变化范围为３９．５２～７４．１２ｍＷ／ｍ２，平均热流值为５５．７２ｍＷ／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．
The problem of high temperature in Huaibei coalfield is going to be more and more terrible, however, the research on the characteristics of geotherma1 field and the distribution of terrestria1 heat f1ow in this region is extremely rare. 〇n the basis of systematica1 analysis of temperature1ogging data of surface boreholes and the tested data of temperature of surrounding rock of underground roadway in Huaibei coalfield, combining the tested results of therma1 conductivity of 72 rock samples, the cur- rent geothermalgradient and terrestria1 heat f1ow in this region are comprehensively expounded. The study shows that the mode of current geotherma1 gradient in Huaibei coalfield is between1. 80 and2. 80℃/hm and the average is2. 42℃/hm. The terrestria1 heat f1ow value ranges from39. 52 to74. 12mW/m2 and the average is55. 72 mW/m2. The geotherma1 gradient and the terrestria1 heat f1ow value are1ower than those in Huainan coalfield and other basins in North China. Terrestria1 heat f1ow is contro11ed by geotherma1 gradient obviously. The variation of geotherma1 distribution is similar to the distribution of geotherma1 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 a1- so higher than that in the east. The analysis shows that the distribution of current geotherma1 field and heat f1ow in the region is mainly contro11ed by regiona1 geo1ogica1 background and regiona1 tectonic framework