高放废物地质处置库甘肃北山预选区大地电磁资料的定性分析研究  

Study on the qualitative analysis of magnetotelluric data in Beishan preselected area Gansu province for Chinas high-level radioactive waste respository

作　　者：王粤[1] 龚育龄[2] 杨露[2] 莫子奋 

机构地区：[1]江西应用技术职业学院,赣州341000 [2]东华理工大学,南昌330013 [3]江西省核工业地质局二六五地质大队,鹰潭335001

出　　处：《物探化探计算技术》2014年第1期60-66,共7页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国防科学技术工业专项(2008-652)

摘　　要：从大地电磁基本理论出发,推导了标量阻抗与张量阻抗计算公式.结合大地电磁阻抗张量分解理论,对预选区旧井测线、新场测线目标花岗岩体上的部分测点数据进行了SWIFT旋转,获取了电性主轴方位角、构造维数特征及二维偏离度等参数.结果表明旧井测线所在区域的构造主轴方位角主要在-10°～20°之间,整体呈二维特性,在构造断裂附近三维特性明显;新场测线构造主轴方位角总体范围与旧井测线类似,部分测点的极化特征表明电性主轴主要以北东向为主,这与SWIFT旋转分解得到的结果是一致的.通过对部分测点视电阻率曲线的分析,了解了预选区地下介质的电性结构特点,为剖面的整体电性解释提供了基础.Firstly,based on the theory of the magnetotelluric,scalar impedance and calculated impedance tensor formula are derived.Secondly,combination of the theory of magnetotelluric impedance tensor decomposition,using SWIFT rotation to process part of the measuring data on the granite in Jiujing and Xinchang of the preselected area.The result showed that the azimuth asis of the construction in Jiujing is mainly between-10°~20°.The result of Xinchang was similar to the Jiujing.The 3Dcharacteristics were obvious where near structural faults,which is consistent to SWIFT rotation.The electric polarization characteristics of the measuring points indicate that the electric axis was mainly north east.To analyze the apparent resistivity curve of the measuring point,we got the characteristics of underground medium electrical structure in the preselected area, which provides the basis of interpretation to the profile.

关 键 词：大地电磁 预选区 阻抗张量 

分 类 号：P631.3[天文地球—地质矿产勘探]