大地电磁资料处理中有效视电阻率的利用  

UTILIZATION OF EFFECTIVE APPARENT RESISTIVITY IN MT DATA PROCESSING AND INTERPRETATION

作　　者：李爱勇[1,2] 柳建新[1] 杨生[3] 

机构地区：[1]中南大学信息物理工程学院,湖南长沙410083 [2]江苏省有色金属华东地质勘查局八一四队,江苏镇江212005 [3]有色金属矿产地质调查中心,北京100073

出　　处：《物探化探计算技术》2011年第5期496-500,462,共5页Computing Techniques For Geophysical and Geochemical Exploration

摘　　要：有效视电阻率与大地电磁响应阻抗张量矩阵的模相对应,是坐标旋转不变量,在一维条件时有效视电阻率等于常规视电阻率aρ,在二维条件时等于TρE和TρM的几何平均,具有降维特征。因静态效应不影响有效视电阻率的曲线形态,所以可用平移法进行静校正,由于与旋转轴无关,对有效视电阻率进行二维反演可避免因极化模式判别不准确而带来的反演结果偏差。经系统的讨论,认为在大地电磁测深资料处理解释中,可充分利用有效视电阻率发挥作用。Based on the systematical discussion of the effective apparent resistivity properties,the effective apparent resistivity is an invariable under the coordinate rotation,which is correspondent to the modulus of magnetotelluric response impedance tensor matrix.Under the 1-D condition,It is equal to the normal apparent resistivity ρa,and under 2-D condition,it is the average of the ρTE and ρTM,which has the dimension reduction property.The parallel moving algorithm was used to do static correction,as the static effect can not affect its curl shape.At the same time,it is irrelative to coordinate rotation,so the inversed deviation because of the incorrect mode discrimination.can be avoided in the effective apparent resistivity 2-D inversion.So the utilization of effective apparent resistivity in processing and interpretation of the magnetotelluric sounding data was recommended.

关 键 词：大地电磁测深 有效视电阻率 旋转不变量 降维特征 

分 类 号：P631.325[天文地球—地质矿产勘探]