Research on the Electrical Structural Characteristics of Deep Geothermal Rock Mass in Granite Area of Southern Jiangxi
Southern Jiangxi Province is rich in geothermal resources,but the lack of research on the deep geothermal geological structure characteristics restricts the development and re-search of regional geothermal resources.On the basis of previous studies,this paper studied the deep structural characteristics through magnetotelluric method and other geophysical work,and established the geothermal genesis mechanism.Taking the granite geological body in southern Jiangxi as the research object,this paper decomposed the statistical rose di-agram of geo-electrical strike,frequency-based cloud maps,site-based cloud image and struc-tural dimension parameters by using magnetotelluric multi-site,multi-frequency tensor de-composition,and then used fine two-dimensional inversion technology to infer the geological structure characteristics and image the geothermal anomalies.Finally,the mechanism of un-derground hot water migration in Xiaobu Town of Ningdu County was studied to identify the geothermal borehole location.The paper concludes that in the study area,the azimuth of the regional electrical spindle varies with the measurement points and frequency points,and a relatively obvious linear structure is identified with the strong geotectonic two-dimensional structure,which is suitable for two-dimensional inversion.The mechanism of hot water mi-gration in the target area is determined to be multi-stage faults of high heat flow and high yield hot granite rock mass,and two main faults F6 and F7 are identified.A 900m drilling target is provided at the hot-water control fracture,and the hot water is successfully pro-duced after well drilling.
granitebroadband magnetotelluric methodimpedance tensor imagingmigra-tion of hot water
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