综合电法在地热田勘探中的应用——以丹东金山地区为例

Application of Comprehensive Electric Method in Geothermal Field Exploration——Taking Jinshan District of Dandong as an Example

为了将丹东金山地区打造成一个具有特色的温泉小镇,对该地区进行了地热勘探。通过对丹东地区的地质资料、重磁电场物探资料、地热井测井资料等综合研究分析后,在金山地区开展了高密度电阻率法、对称四极电测深法和可控源音频大地电磁法(CSAMT法)等综合物探工作,根据这三种电法勘探方法的探测深度不同,由浅及深地逐层揭露出不明显勘查区的地质构造情况,并得到了如下认识:该区受鸭绿江断裂成热带控制,发育有北东向(F1)、北东东(F1')向两组断裂,属于典型的对流型负花状构造地热发育模式。以此确定了金山区地热井位ZK1,并进行了地热井施工钻探。终井深度2013 m,井口取水温度52.8℃,开采量可达1500 m^3/d开采物主要是一种含硫化氢、氟、硅等复合型医疗热矿水,医疗价值较高。该地热井的成功,无论在经济价值还是社会效益方面都取得了良好的效果,也证明了利用综合物探手段寻找深层地热水是有效的。

In order to make Jinshan district of Dandong as a special hot spring town,geothermal exploration has been carried out in this area.After researching and analyzing the data of geology,gravity magnetic field,geophysical well and geothermal well logging in Dandong area,the comprehensive geophysical exploration work has been carried out in Jinshan area,such as high-density resistivity method,symmetrical quadrupole resistivity sounding method and CSAMT method.According to the different detection depth of the three electric methods,the geological structure of the exploration area is revealed by layer from shallow to deep.Results show that the area is controlled by Yalujiang fault with tropicalization.Two groups of faults in NE direction(F1)and NE direction(F1′)belong to typical geothermal development modes with convective type and negative flower structure.Based on this,the geothermal well location of ZK1 has been determined and the drilling construction of geothermal well has been carried out in Jinshan District.The final well depth is 2013 m with the temperature as 52.8℃,and the exploitation quantity as 1500m3/d.It is a kind of composite medical hot mineral water with high medical value containing hydrogen sulfide,fluorine,silicon,etc.The economic value and social benefits will be achieved base on the success of the geothermal well.And it is also proven to be effective to find deep geothermal water by comprehensive geophysical prospecting method.