分布式三维电法研究进展  

Review of distributed 3D DC/IP method

作　　者：张亚伟[1,2] 严加永[1] 张昆[1] 张永谦[1] 邵陆森 

机构地区：[1]中国地质科学院矿产资源研究所,国土资源部成矿作用与资源评价重点实验室,北京100037 [2]东华理工大学核工程与地球物理学院,南昌330013

出　　处：《地球物理学进展》2015年第4期1959-1970,共12页Progress in Geophysics

基　　金：地质调查项目(12120114053301);中央级公益性科研院所基本科研业务费项目(k1217);国家自然科学基金项目(41104061;41304100)联合资助

摘　　要：自然界中几乎所有的地质结构都是三维的,尤其是对于矿体形态变化很大的金属矿,常规的二维电法探测很难准确刻画其三维形态,另一方面,极化率参数对硫化物金属矿的反映更为直接有效,因此开展三维电法工作获取电阻率和极化率三维形态,是深部矿产资源探测的迫切需求,也是当前电法的发展方向.本文从原理、装置、硬件系统、反演方法及软件等方面,介绍了分布式三维直流电法勘探研究进展.通过对TITAN-24、NEWDAS和IRIS分布式系统的特点及其应用实例分析,发现由于同时观测不同方向的电性参数,大大提高了横向分辨率;大功率、大极距的采集方法,有效加大了勘探深度;分布式的测站布设,提高了工作效率;采用全波形记录前提下,在干扰严重的老矿山周边,仍能采集到有效的电法数据,为危机矿山的深、边部找矿开辟了新的途径.In nature,almost all the geological structures are3 D,especially in the exploration of metal ore.Because of the ore bodies＇ various shapes,it＇s hard for 2Delectrical detection to accurately characterize the subsurface 3D structure,and polarization parameters＇ reflection of vulcanization metallic ore can be more direct and efficient.Using 3DDC electrical method to obtain the 3Dform of resistivity and polarizability it＇s not only the urgent need of deep resource exploration but also the development direction of the DC electrical method.Theories,arrays of electrodes,hardware systems,inversion methods and inversion softwares etc.,from those aspects,this paper introduced the research progresses of the distributed 3D DC electrical method exploration.According to the analyzation of characteristics and applications of TITAN-24,NEWDAS and IRIS distributed system,it came to the conclusion that,the simultaneous observation of the electrical parameters in different directions greatly improved the lateral resolution;The high-power and large electrode distance acquisition methods efficiently extended the depth of explorations; Distributed receivers improved work efficiency;By using full waveform recording,even in the old mines where the noise is sever,the valid electrical data can still be received,and thus,it found a new way for outer and deeper prospecting of crisis mines.

关 键 词：分布式 三维直流电法 电阻率 极化率 反演 

分 类 号：P631[天文地球—地质矿产勘探]