摘要
目前国内煤田地质勘探中垂直深度达1200～1500m,部分省区采煤深度也达到了1000m,地层温度都比较高。一般情况下,一级热害区可以通过通风可以达到降温的效果,而二级热害区就必须在井底进行人工制冷,才能确保工人的生命安全。以陶乐南部勘查区测量井温为例,确定了该区恒温带的深度为60m,温度为14.55℃,并将96.0%作为孔底温度校正系数,计算出各简易测温钻井孔底的校正温度及平均地温校正系数;据此计算平均地温梯度和煤层底板温度。依据煤层底板深度与温度作出的井温等值线,圈定煤层一级热害区(地温达到31～37℃)与二级热害区(地温大于37℃)的分布范围并计算其面积:该勘查区9-1煤层底板一级热害区0.46km2;二级热害区6.05km2。
Coal geological exploration vertical depth is 1200～1500m in the country at present,while mining depth has already reached at 1000m in some provinces.Thus geotemperature at this depth is rather high,with regard to coalmine development and construction,geotemperature data is quite important.Generally,in Grade Ⅰ thermal damage zones,ventilation can cool down the temperature,but in Grade Ⅱ zones should use artificial refrigeration to ensure life security of miners.Taking borehole temperature measurement in the Taole south exploration area as an example,depth of constant temperature zone is 60m,temperature 14.55℃,to take 96.0% as borehole bottom temperature correction factor,calculated facility temperature measuring borehole bottom corrected temperature and average geotemperature correction factor,by these to calculate average geothermal gradient and coal floor temperature.Using borehole temperature isopleths based on coal floor depth and temperature,delineate thermal damage Grade Ⅰ（with geotemperature 31～37℃） and Grade Ⅱ（ 37℃） zones distribution range and area： in this exploration area,No.9-1 coal floor Grade Ⅰ zone is 0.46km2,Grade Ⅱ zone 6.05km2.
出处
《中国煤炭地质》
2011年第3期66-69,共4页
Coal Geology of China
关键词
井温测井
恒温带
地温梯度
热害区
borehole temperature logging
constant temperature zone
geothermal gradient
thermal damage zone
