MT相对视电阻率定义及应用研究  

The definition of MT relative apparent resistivity and it's application

作　　者：冯兵[1] 黄保胜[1] 张继锋[1] 孙礼钊[1] 

机构地区：[1]长安大学地质工程与测绘学院,西安710054

出　　处：《地球物理学进展》2014年第1期197-203,共7页Progress in Geophysics

基　　金：南岭于都-赣县矿集区立体探测技术与深部成矿预测示范课题(SinoProbe-03-03);国家自然科学基金项目基于梯度重构技术的2.5维频域电偶源正演研究(41104075)联合资助

摘　　要：本文在总结分析前人对MT视电阻率研究的基础上,提出了一种新的MT视电阻率定义方法—MT相对视电阻率,探讨了其在深部探测中的适用性.MT二维地电模型计算结果表明,TM模式相对视电阻率与Cagniard视电阻率类似,误差在容许范围内,其用于深部探测是可行的.南岭于都一赣县矿集区盘古山的MT实测资料验证了相时视电阻率在解决深部地质问题中的的可行性和有效性.MT相对视电阻率避开了低频磁场观测的复杂性,避免了低频磁场分量变化带来的畸变,为利用天然电场解决深部介质的电阻率分布奠定了基础.This paper on the basis of summary and analysis predecessors＇ s study of MT apparent resistivity, proposes a new MT apparent resistivity definition method-MT relative apparent resistivity and discusses its applicability in the deep detection. Tow-dimensional geoelectric model calculation results of MT show that TM mode relative apparent resistivity and Cagniard apparent resistivity is similar, the error is in the allowable range, it is feasible for deep detection. The MT data measured in PamGu mountain of Nan Ling Yu Du Gong Xian ore^eoncentrated areas verify the relative apparent resistivity＇s feasibility and effectiveness in solving deep geological problems. MT relative apparent resistivity avoids the complexity of low frequency magnetic field＇s observation and the distortion caused of low frequency magnetic field component change, lays the foundation of solving underground medium resistivity distribution by using natural electric field.

关 键 词：MT TM模式 电场分量 相对视电阻率 Cagniard视 电阻率 

分 类 号：P631[天文地球—地质矿产勘探]