华北平原区地温梯度与基底构造形态的关系

本文根据部分实测温度资料和有限单元法的数值模拟计算结果,研究了华北平原区地温梯度和地表热流值与基底构造形态的关系,分析了盖层相对厚度、基岩侧界面倾角以及不同岩石热导率比值对地温梯度和地表热流分布图式的影响,并讨论了地壳浅部热流的折射和再分配问题。在此基础上,提出了华北平原区地温梯度和热流值基底构造形态的相关直线校正法,即根据不同构造部位上钻孔的实测地温梯度和盖层相对厚度的相关直线推算区域平均地温梯度和具代表性区域热流值的方法。

RELATIONSHIP BETWEEN GEOTHERMAL GRADIENT AND THE RELIEF OF BASEMENT R OCK IN NORTH CHINA PLAIN

Based on temperature measurement data in boreholes and the results of mathematical simulation by finite-element method, the relationship between geothermal gradient and the structure form or the relief of basement rock in North China Plain has been revealed. The effects of relative thickness of sedimentary cover, the boundary angle and the thermal conductivity ratio between basement rock and sediments on geothermal gradient and heat flow pattern were discussed in detail. The problem of heat flow refraction and heat flow redistribution in the uppermost part of the Earth's crust has been studied as well. Finally, a method to correct the measured geothermal gradient and heat flow density biased by the relief of basement rock in North China Plain has been suggested in this paper.