According to the hydrogeological conditions, the Jinniu Lake area in Nanjing exhibits significant geothermal resource potential. To investigate the characteristics and spatial distribution of tectonic fractures in this region and identify potential deep geothermal drilling targets, an integrated geophysical exploration approach was adopted. The study first employed the Controlled Source Audio-Frequency Magnetotelluric (CSAMT) method to delineate the positions of fault structures and basement morphology within the exploration area. Subsequently, survey lines were deployed at favorable fracture locations, and the Time-Frequency Electromagnetic (TFEM) method—known for its strong anti-interference capability and large detection depth—was applied for further verification. Based on inversion and interpretation results, promising geothermal drilling well locations were proposed. Finally, microtremor surveys were conducted along the proposed well sites to refine the target locations by integrating low-velocity anomalies from microtremor data and low-resistivity features from electromagnetic methods. Drilling verification confirmed the presence of a fracture at 1, 600 m, with the final borehole depth reaching 2, 800 m. Post-drilling pumping tests revealed a wellhead water temperature of 51 ℃, indicating high-quality deep geothermal resources.By progressively narrowing the exploration scope from regional to linear and finally to point scales, and through mutual validation of multiple geophysical methods, optimal well locations were successfully determined. This integrated geophysical approach provides valuable geothermal exploration experience for similar study.