河南平顶山北部地区地热概念模型研究

Research on geothermal conceptual model in the northern area of Pingdingshan,Henan

河南省平顶山北部地区蕴藏丰富的沉积盆地型地热资源。该区位于华熊台缘坳陷地热亚区中的平顶山凹间隆起地热异常区,有良好的形成地热的区域背景,区内主要为一套煤系地层,主要热储层为寒武系崮山组—张夏组热储和朱砂洞组下部灰岩热储,上石炭统太原组以上地层均为本区盖层,研究区所能接受的热量主要是地球深部的热能。热传导方式为对流-传导复合模式,在平面上地温梯度从西北向东南沿着李口向斜有逐渐增大的趋势,在垂向上变化均匀。地表降水通过断层进入深部,在深循环对流加热增温后,沿两断层上涌至与其连通的其他断层,进入热储层。同时地球内部的热量还会以传导的方式向上传递,为热储层持续加温,形成沿两个热储层层状分布的地热资源。以上地热概念模型的建立,对今后区内中深层地热勘查开发有一定指导意义。

There are rich sedimentary basin-type geothermal resources in the northern area of Pingdingshan.It is located in the geothermal anomaly area of Pingdingshan inter-sag uplift in the geothermal subarea of Huaxiong platform margin depression.It has a good regional background for the geothermal formation.There is a set of coal system strata in the area.The main thermal reservoirs are the Cambrian Gushan Formation-Zhangxia Formation reservoir and limestone reservoir in the lower part of Zhushadong Formation.The strata above the Upper Carboniferous Taiyuan Formation are caprocks in this area.The heat that can be accepted in the research area is mainly the thermal energy in the deep part of the earth.Thermal conduction mode is convection-conductive composite mode.The geothermal gradient on the plane increases from northwest to southeast along the Likou syncline,and changes evenly in the vertical direction.The surface precipitation enters the deep through the fault,and after the deep circulation convective heating and warming,it surges up along the two faults to other faults that connected with them,and enter thermal reservoir.At the same time,the heat in the earth's interior will be transmitted upward by conduction.The reservoir is continuously heated,forming a geothermal resource distributed in layers along the two thermal reservoirs.This conceptual model of geothermal heat is of guiding significance for the exploration and development of middeep geothermal heat in the future.