Drilling temperature distribution in Xinzheng mining area and its controlling mechanism
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摘要: 地温是影响煤炭开采的重要地质因素之一。通过对新郑矿区911钻孔稳态测温及理论分析表明,911孔位于新郑矿区主体构造滹沱背斜的轴部,具有高热流、高梯度的温度分布特征。钻孔的温度分布主要受构造起伏的影响和地下水垂向对流的控制双重作用。矿区构造起伏使来自地壳深部的热流重新分配并向背斜轴部集中,从而导致911孔出现高热流高梯度的温度特征;地下水的垂直对流运动使钻孔的温度分布进一步产生差异性。Abstract: The ground temperature is one of the main important geologic factors affecting the coal mining.It is shown that Borehole No.911 lies in the Hutuo anticlinal axis,the main structure of Xinzheng mining area and has the distribution characteristics of high heat flow and high geothermal gradient through measurement in steady state and theory analysis.The temperature of the borehole mainly affected by double controlling factors including the tectonic fluctuation and the groundwater vertical convection.The heat flow coming from deep crust is reappor-tioned by the fluctuation of the mining area and made concentrating to anticlinal axis and the temperature charac-teristics of high heat flow and high geothermal gradient of Borehole No.911 is resulted in.More different distribu-tion to the drill temperature is impelled by the vertical convection movement of groundwater,and the distribution and controlling mechanisms of the ground temperature field are revealed.
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