摘要
为了建立适合于山东胶西北深部金矿集中区地质—地球物理找矿模型,在已知地质剖面开展多种电磁勘探技术实验,同时优选出适用于胶西北强干扰区金矿集中区深部地球物理勘探方法。对比分析广域电磁法(WFEM)、大地电磁法(MT)、可控源音频大地电磁法(CSAMT)与频谱激电法(SIP)的勘探成果发现:相对于MT而言,广域电磁法具有分辨率高、数据精度高、抗干扰能力强和施工效率高等优势;相对于CSAMT和SIP而言,广域电磁法具有勘探深度大、抗干扰能力强、数据精度高等技术优点。多种方法揭示了剖面线2km内地层和岩体及断裂蚀变带空间分布特征,却未能提供深部内物性参数;反观广域电磁法成果,不仅展示了浅中部电阻率变化规律和特征,同时有效地反映了深部断裂蚀变带的变化特征。结果表明广域电磁法是本次综合物探研究工作中的有效勘探方法,同时为深部成矿预测和模型建立提供了准确的地球物理参数。
In order to establish a geological-geophysical prospecting model suitable for the deep gold deposits in Jiaoxibei region of Shandong,the authors performed a variety of electromagnetic exploration technologies on known geological sections,and selected a deep geophysical exploration method suitable for the concentrated gold deposits in the strong interference zone of Jiaoxibei region.The contrasting and analyzing of the exploration results of wide field electromagnetic method,magnetotelluric method(MT),controlled source audio-frequency magnetotelluric method(CSAMT)and spectrum IP method(SIP)show that,compared with MT,the wide area electromagnetic method has the advantages of high resolution,high data accuracy,strong anti-interference capability and high construction efficiency,and compared with CSAMT and SIP,the wide area electromagnetic method has large exploration depth and strong anti-interference capability,high data accuracy and other technical advantages.Various methods can reveal the spatial distribution characteristics of strata,rock masses and fault alteration zones within 2 km of the profile line,but fail to provide deep physical parameters.In contrast,the results of the wide field electromagnetic method not only show the changing rules and characteristics of the shallow central resistivity,but also effectively reflect the changing characteristics of the deep fault alteration zone.The results show that the wide-area electromagnetic method is an effective exploration method in this comprehensive geophysical research,and it also provides accurate geophysical parameters for deep mineralization prediction and model establishment.
作者
王洪军
田红军
贺春艳
刘光迪
WANG Hong-Jun;TIAN Hong-Jun;HE Chun-Yan;LIU Guang-Di(Shandong Institute of Geophysical and Chemical Exploration and Exploration,Jinan 250109,China;Sichuan Zhongcheng Coal Field Geophysical Engineering Research Institute Co.,Ltd.,Chengdu 610072,China;School of Geosciences and Info-Physics,Central South University,Changsha 410083,China)
出处
《物探与化探》
CAS
北大核心
2020年第5期1053-1058,共6页
Geophysical and Geochemical Exploration
基金
山东省重大科技创新工程“深部探测综合地球物理技术”(2018CXGC1601)、“深部金矿资源评价理论、方法与预测”(2017CXGC1604)。
关键词
广域电磁法
金矿
深部勘探
胶西北
wide field electromagnetic method
gold ore
deep exploration
Jiaoxibei(northwest Shandong)
