开封凹陷区地温场特征分析

Geothermal field′s characteristics analysis in Kaifeng depression

开封凹陷区有着丰富的地下热水资源。本文在搜集、实测井孔测温资料的基础上,研究分析了开封凹陷区地温场特征及其影响因素。研究表明,由于受基底构造控制,开封凹陷区地温分布存在差异,高地温分布区恰好位于基底构造较发育的开封县城和兰考县城附近,全区地温梯度在2.50~3.68℃/100m之间,平均值为3.09℃/100m,热储层埋深小于500m时地温梯度变幅随深度的增加而增大,大于500m时随深度的增加而减小。

There are rich terrestrial geothermal water resources in Kaifeng depression. This study analyses the ground temperature field distribution characteristic as well as influence ground temperature field distribution factor based on collection and actual bore-bole temperature measurement material. The results show that due to the basement structure control, different geotemperature distribution in Kaifeng depression, the high temperature area just locates in the basement structure of Lankao county and Kaifeng county, the temperature gradient in the region is between 2.50 3.68℃/100 m, and average of 3.09℃/100 m. In the geothermal reservoir depth of less than 500 m, the Change of temperature gradient increase with the increase of depth, the Change of temperature gradient decreases, with a depth of more than 500 m.