双频激电偶极——偶极多极距剖面测量应用  

The Application of Multi-spacing Electrodes Profile Measurement to Dual Frequency Electromechanical Dipole-Dipole Array

作　　者：李涛 王宏宇 

机构地区：[1]西北有色地质勘查局七一七地质总队,陕西宝鸡721015 [2]西北有色地质勘查局,陕西西安710054 [3]西北有色国际投资有限公司,陕西西安710054

出　　处：《工程地球物理学报》2018年第1期7-12,共6页Chinese Journal of Engineering Geophysics

基　　金：国家自然科学基金(编号:41227803);国外矿产资源风险勘查专项资金项目(编号:陕风勘201211B02700101)

摘　　要：双频激电是一种测量精度高、抗干扰能力强、装置轻便的频率域激发极化法。实际应用中,电极排列多以中梯、偶极、二极、三极等为主。本文对比了中间梯度排列和偶极排列在抗干扰能力、抗感应耦合能力、发现异常能力的特点,同时两种排列方法在已知矿体上的对比试验表明,偶极排列的激电异常比中间梯度的异常幅值大,具有更强的发现异常的能力,在实际应用中取得了良好的勘查效果。结论认为:中间梯度排列较偶极排列而言具有布线简便、生产效率高的特点;但在抗干扰能力、抗感应耦合能力方面偶极排列明显优于中间梯度排列;在异常形态复杂,同时对测量排列分辨能力、抗干扰能力、抗感应耦合能力要求较高的情况下建议优选偶极排列,并且进行多极距观测。Dual frequency electro mechanics is a kind of frequency domain induced polarization method which has high accuracy with strong anti-interference ability and portable device.In field application,the most useful electrode arrangements include gradient array,dipole-dipole array,two electrode array,pole-dipole array etc.This paper compares the ability of anti-interference,resistance to inductive coupling and finding abnormality between intermediate gradient array and dipole-diploe array and the contrast test of the two different arrays in a known ore deposit shows that dipole-dipole array is much larger in e-lectromechanical abnormality and has stronger ability of finding abnormality than the gradient array,and has a good exploration effect.It concludes that the gradient array has the characteristics of simpler and higher production efficiency,but the ability of anti-interference and resistance to inductive coupling is poorer,comparing with the dipole-dipole array.In field work,considering the complex abnormal form and the ability of resolution,anti-interference and resistance to inductive coupling in measuring arrangement,dipoledipole array is suggested to conduct multi-spacing electrodes observation.

关 键 词：双频激电 中间梯度 偶极 感应耦合 排列 

分 类 号：P631.3[天文地球—地质矿产勘探]