多种电磁法在地热资源勘查中的应用

Application of Various Electromagnetic Methods in Geothermal Resources Exploration

在地热调查中,电磁法以探测深度大、不受高阻层屏蔽影响、可以有效圈定地下水分布范围而被广泛使用。为充分利用天然资源和保护自然环境,查明生态区的地热资源,本文采用大地电磁、瞬变电磁和大地电场探测三种方法对生态区地下水分布情况进行了勘查,相继查明了地层岩性变化、构造空间等分布情况,三种方法相互印证。圈出多层段的有效储热层,在预定位置进行钻孔验证后,获得了低温热水,取得了良好的地质效果,表明物探方法合理搭配、综合使用能够有效提高效率和准确率,也为类似地区寻找地热水提供了可借鉴的案例。

In exploration of geothermal resource,Electromagnetic exploration is widely used in geothermal that can be identified groundwater distribution effectively in the overlying rock of high resistance. In this paper,Combining the methods of the controlled source audio frequency magnetotelluric sounding,transient electromagnetic and Lithology detection of geoelectric field,we detected the information of strata,litholoical,structure.And especially multi-storey thermal reservior were be marked in the ecological district. Then wells location were set according to the above results,finally the low temperature water geothermal wells in the Ecological district was obtained.It provides experience for probing geothermal water in the similar areas.