钻井-地表电极联合电阻率观测装置的异常特征研究  

A study on anomaly of borehole-to-ground joint resistivity surveying system

作　　者：黄俊革[1] 阮百尧[2] 王家林[3] 张家峰[3] 吕玉增[2] 

机构地区：[1]上海应用技术学院土木建筑与安全工程学院,上海200234 [2]桂林工学院资源与环境工程系,桂林541004 [3]同济大学海洋与地球科学学院,上海200092

出　　处：《地球物理学报》2009年第5期1348-1362,共15页Chinese Journal of Geophysics

基　　金：国家自然科学基金项目(40774057);上海市教委创新基金项目(08YZ168);上海应用技术学院科研启动基金;上海博士后基金项目(05R214143);全国危机矿山接替找矿项目"地-井;井-地和坑道IP正反演技术示范"(200799086)资助

摘　　要：本文利用有限单元法对多种钻井-地表电极联合电阻率观测装置在球体、直立板和水平板体等典型地质体模型上的异常响应进行正演计算,并分析其异常特征和分布规律.计算结果表明利用井中和地表电极的联合观测方式进行地下介质探测,可在兼顾地质体的水平分辨能力的同时,提高电阻率测深在垂向上分辨率.就水平分辨率而言,四极(偶极)装置对地质体的水平定位能力最强,井-地三极装置次之,地-井三极的分辨能力最差.就垂向分辨能力来说,各种观测装置的分辨率相差不大.Borehole-ground joint pole resistivity surveying system, which is one of the normal method in engineering prospecting, can detect the bodies in many bearings and close range. In order to study the anomalous feature of several hole-ground joint pole resistivity surveying array, the numerical modeling using FEM on some typical geologic bodies, such as sphere, vertical plate, horizontal plate, was done in this paper. The results show that hole-ground joint pole resistivity surveying system can improve vertical and horizontal resolution. As far as horizontal resolution is concerned, dipole-dipole array is the best one, hole-to-ground pole-dipole is better than ground to-hole pole-dipole. There is little different to every hole-ground array in terms of vertical resolution. It is essential to distinguish the distinct configuration of apparent resistivity anomaly of every array in practice.

关 键 词：钻井-地表 联合电极 电阻率 异常 有限元 

分 类 号：P631[天文地球—地质矿产勘探]