磁源瞬变电磁法中心回线装置全程视电阻率定义及计算  

DEFINITION AND CALCULATION OF ALL-TIME APPARENT RESISTIVITY FOR CENTRAL LOOP DEVICE OF MAGNETIC SOURCE TEM

作　　者：冯兵[1,2] 孟小红[1] 张斌[2] 

机构地区：[1]中国地质大学地球物理与信息技术学院,北京100083 [2]长安大学地质工程与测绘学院,陕西西安710054

出　　处：《物探与化探》2010年第5期686-690,共5页Geophysical and Geochemical Exploration

基　　金：交通部应用研究项目(2001-318-812-13)

摘　　要：讨论了磁源TEM中心回线装置全程视电阻率的计算问题。利用电偶极子的瞬变场叠加来计算磁源TEM中心回线装置的瞬变场,均匀半空间的计算结果表明,该方法是可行的。用电偶极子的瞬变场定义了磁源瞬变电磁法中心回线装置全程视电阻率,通过对二、三、四层电性断面的视电阻率的计算,并与TEM晚期视电阻率进行了对比,说明了该定义的优越性。实测磁源TEM资料的计算表明,用电偶极子的瞬变场定义的磁源瞬变电磁法中心回线装置全程视电阻率较好地反映了电性断面特征,其对浅层磁源TEM探测及资料解译具有使用价值。Calculation of all-time apparent resistivity for the central loop TEM magnetic source devices is discussed in this paper.Homogeneous half-space calculation results show that it is feasible for transient electric dipole superposition to calculate the magnetic field source device TEM central loop transient field;the definition of all-time apparent resistivity for magnetic source central loop device using electric dipole transient field.Through the calculation of apparent resistivity and apparent resistivity for the two-layers,three-and four-layers electric section and comparison with late-time apparent resistivity for TEM,the superiority of the definition is illustrated.The calculations of magnetic source TEM field data show that the definition of all-time apparent resistivity for magnetic source central loop device using electric dipole transient field better reflects the characteristics of Electric section and it is valuable for shallow magnetic source TEM detection and data interpretation

关 键 词：磁源瞬变电磁法 中心回线装置 晚期视电阻率 电偶极子 全程视电阻率 

分 类 号：P631[天文地球—地质矿产勘探]