Application of Time-frequency Electromagnetic Method in Exploration of Deep Geothermal Resources in Jinniu Lake Area
In order to identify the deep geothermal resources in Jinniu Lake area of Nanjing,the time-frequency electromagnetic method is used to detect the complex geological struc-ture,thick low-resistivity covering layer and strong electromagnetic interference.In this pa-per,two sections of time-frequency electromagnetic method are integrated by way of high-power transmission,thus the signal can effectively penetrate the low-resistance covering lay-er,and high signal-to-noise ratio is obtained with the original data.Through the processing,analysis,inversion and comprehensive interpretation of time-frequency electromagnetic data,a two-dimensional electrical structure model with a depth of 4 000 m in the exploration area is obtained.Combined with the geothermal geological conditions,the geothermal drilling of well location is optimized.After the final drilling verification,the actual drilling is basically consistent with the speculated formation.A fracture was encountered during the 1 600 m drilling,and the final hole depth was 2 800 m.The successive pumping tests verify that the daily water output is greater than 500 m3,the water temperature at the drilling wellhead is 51 ℃,indicating that high-quality deep geothermal resources achieved.This paper concludes that the time-frequency electromagnetic method has a good application effect in the explora-tion of deep geothermal resources in the Jinniu Lake area,revealing the better geothermal geological conditions in Jinniu Lake area of Nanjing,and providing a solid foundation for the development and utilization of geothermal tourism resources in this area.
time-frequency electromagnetic methodexploration of deep geothermal resourcesJinniu lake area of Nanjing
NETL
NSTL
万方数据
维普
