Geotherm Distribution in Guobei Coal Mine and Its Influencing Factors

Abnormal geotherm exists in Guobei Coal Mine and the highest gradient of temperature in borehole is 3.33 ℃/hm.In order to reveal characteristics of ground temperature field,based on geo-temperature measured in boreholes and geological data,relationship between temperature in the floor of major mining coal-bed 82 and the coal bed occurence depth,and the distribution of geothermal gradient contour were studied.The results show that the fualts F26 and F22 play an important roal in control of geotherm distribution.The reason of abnormal geotherm is that in the area deep cyclar groundwater elevation results in local high geothem.