综合物探方法在济南市章丘地区地热资源勘查中的应用

Application of Integrated Geophysical Survey Methods in Exploration of Geothermal Resource in Zhangqiu Area of Jinan City

利用大极距电阻率测深、高精度磁测和音频大地电磁法开展综合物探工作,查明工作区隐伏断裂构造及破碎带位置即寻找深部导热储水构造,推测热储层顶板埋深,圈定低阻异常区。根据当地的地质、地形与施工条件,选择合理的物探方法确定钻井位置,设计钻孔深度,施工钻孔,最终打出了自流量70 m3/h、井口水温41℃的理想低温型热水井。

By using large polar distance resistivity sounding, high- precision magnetic measurement, and audiofrequency magnetotelluric methods, integrated geophysical exploration work has been carried out. It is identified that hidden faults and fracture zones are the location of searching for the deep thermal water storage structures. Its roof depth of thermal reservoir is speculated, and low resistance anomaly area is circled as well. According to geology, topography and construction conditions in this region, through using reasonable geophysical method to determine the drilling location, design the drilling depth, an ideal low temperature thermal well has been digged with the flow of 70m^3/h, while the temperature of well head is 41 ℃.