Electrical structure characteristics and geothermal exploration directions of the upper crust on the eastern margin of the Yinchuan Basin
The successful operation of geothermal wells on the eastern margin of the Yinchuan Basin suggests a new geothermal explora-tion orientation around the Huanghe fault and its secondary faults.To further investigate the controlling effect of the Huanghe fault on geothermal resources in the study area and pinpoint the exploration target,this study arranged four magnetotelluric(MT)lines,obtai-ning 71 survey points.The preprocessing and two-dimensional inversion of MT data yielded a two-dimensional electrical structure of the study area within a depth of 10 km.Based on the previous geological,gravity,microtremor,and controllable source audio magnetotellu-rics(CSAMT)data in the study area,this study further interpreted the strata and fault structures of the study area.It posited that the relatively-low-resistivity zone within the high-resistivity zone of the Ordovician basement reflected by the MT lines may be the seconda-ry-fault development site at the rear edge of the Huanghe fault,which is caused by the fragmentation and water filling of Ordovician strata,showing certain exploration potential for geothermal resources.
eastern margin of the Yinchuan Basinelectrical structuregeothermal exploration
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