基于RL电路的球状地质体瞬变电磁观测电位改正  

Potential correction during TEM observation of spherical geological body based on RL circuit

作　　者：韩阳 李文尧[1] 马松 隆季原 Han Yang;Li Wenyao;Ma Song;Long Jiyuan(School of Land and Resources Engineering,Kunming University of Science and Technology,Kunming Yunnan 650093,China)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093

出　　处：《化工矿物与加工》2021年第8期32-36,共5页Industrial Minerals & Processing

基　　金：国家重点研发计划项目(2018YFC0603903-03)。

摘　　要：在瞬变电磁法观测系统中,使用接收线圈的观测电位近似代替地质体的感应电位时常会产生误差,导致反演和推断解释结果不可靠。通过对瞬变电磁中心回线接收线圈等效电路的深入分析,将地质体的感应电位近似为接收线圈内阻电位、电感电位、匹配电阻电位(观测电位)之和。基于球状地质体中心回线瞬变电磁场表达式,通过公式推导,采用曲线拟合的方法,提出了球状地质体接收线圈观测电位改正方法,并对该改正方法进行了有效性及稳定性分析,结果表明:改正方法有效且稳定,改正后的电位与理论电位误差小于5%。In most TEM observation systems,when the observed electric potential of receiving coil is used to approximately replace the induced potential of ore body,the difference between them is often found to result in unreliable deduction and interpretation.Through in-depth analysis of the equivalent circuit composed of the receiving coils in TEM loop,the induced potential of the ore body was approached to the sum of the internal resistance potential,the inductance potential and the matching resistance potential(observed potential)of the receiving coil.Based on the representation on the transient electromagnetic field of the central loop of the spherical geological body,the correction method of the observed electric potential of the receiving coil of the spherical geological body was proposed via the formula derivation and curve fitting.The availability and stability of the correction method were studied.The results show that the correction method is effective and stable as the difference between the corrected potential and the theoretical potential is less than 5%.

关 键 词：电位 瞬变电磁法 电位改正 球状地质体 瞬变电磁场 电感 接收线圈 

分 类 号：P62[天文地球—地质矿产勘探]