摘要
扬子准地台黔北台隆地热试验区电磁、人文干扰严重,制约了传统电磁法在该试验区的勘探效果。本文对试验区干扰源及岩层物性参数进行综合评估后,开展高精度大深度广域电磁法探测实验,进行二维连续介质带源反演,获得地下5 km地层电阻率分布特征,其中奥陶系下统湄潭组、寒武系下统金顶山组、明心寺组、牛蹄塘组低电阻层为试验区盖层,奥陶系下统花园组、桐梓组、寒武系娄山观组、石冷水组、高台组、清虚洞组、震旦系灯影组高阻层为储热层,同时也揭示了深部断裂构造对储热层的影响。广域电磁法成果揭示的电性层与钻井SZK1揭示的地层信息相吻合,表明在扬子准地台黔北台隆地热强干扰区,广域电磁法是一种有效的探测手段,丰富了黔北地热能源研究成果,为进一步推动黔北地热勘探提供地球物理参数。
The electromagnetic and human interference in the Tailong geothermal test area of Qianbei(northern Guizhou)platform uplift on the Yangtze metaplatform has restricted the exploration effect of the traditional electromagnetic method.Based on a comprehensive evaluation of interference sources and rock physical parameters obtained from the experimental zone,the authors carried out high precision deep wide-area electromagnetic detection experiments,conducted two-dimensional continuum source inversion,and obtained underground stratigraphic resistivity distribution regularity and characteristics at the depth of 5 km,with lower Ordovician Meitan Formation,lower Cambrian Jindingshan Formation,,Mingxinsi Formation and Niutitang Formation as the low resistance cover layers of the experimental zone,the lower Ordovician Huayuan Formation,Tongzi Formation,Cambrian Loushanguan Formation,Shilengshui Formation,Gaotai Formation and Qingxudong Formation,and Sinian Dengying Formation as the high resistance layers for heat storage.The influence of the deep fracture structure on the heat storage layer was also revealed.The electrical layer revealed by the wide-area electromagnetic method is consistent with the information revealed by the drilling SZK1,and the results show that the wide-area electromagnetic method is an effective detection method in the strong geothermal interference zone of Qianbei platform uplift on the Yangtze paraplatform.The results obtained by the authors enrich the geothermal energy research results in northern Guizhou and provide geophysical parameters for further promotion of geothermal exploration in northern Guizhou.
作者
田红军
张光大
刘光迪
游文兵
张应文
TIAN Hong-Jun;ZHANG Guang-Da;LIU Guang-Di;YOU Wen-Bing;ZHANG Ying-Wen(Sichuan Zhongcheng Coal Field Geophysical Engineering Research Institute Co.,Ltd.,Chengdu 610072,China 410208,China;School of Geosci-ences and Info-physics,Central South University,Changsha 410083,China;Hunan Jishan High-Tech Co.,Ltd.,Changsha 410208,China;No.102 Geological Party,Guizhou Bureau of Geology and Mineral Resources,Zunyi 563003,China)
出处
《物探与化探》
CAS
北大核心
2020年第5期1093-1097,共5页
Geophysical and Geochemical Exploration
关键词
强干扰区
地热
广域电磁法
电阻率
地球物理参数
strong interference zone
geothermal
wide field electromagnetic method
resistivity
geophysical parameter
