定源瞬变电磁数据的时频转换反演技术研究  

Research on time-frequency conversion in inversion of fixed source transient electromagnetic data

作　　者：张艳龙 吴燕清 邓刘洋 崔少北 ZHANG Yanlong;WU Yanqing;DENG Liuyang;CUI Shaobei(Stake Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China;CCTEG Chongqing Research Institute,Chongqing 400037,China)

机构地区：[1]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400044 [2]中煤科工集团重庆研究院有限公司,重庆400037

出　　处：《矿业安全与环保》2021年第5期43-49,共7页Mining Safety & Environmental Protection

基　　金：“十三五”国家科技重大专项课题(2016ZX05045004-007)。

摘　　要：目前定源回线瞬变电磁数据处理主要还是通过一维反演进行视电阻率计算。为了实现时域瞬变电磁数据快速三维正反演,提高反演精度,基于时频转换理论,采用正则化技术、有限差分法和NLCG反演算法,研究了理想模型及实测数据频域的三维正反演。解决了时频转换过程中矩阵奇异性求解的问题,成功实现了瞬变电磁响应时域向频域的转换和瞬变电磁响应频域的三维正反演。At present,the processing of constant source loop transient electromagnetic data is mainly to calculate the apparent resistivity by one-dimensional inversion.In order to realize fast 3 D forward and inversion of transient electromagnetic data in time domain and improve inversion accuracy,the 3 D forward and inversion of ideal model and measured data in frequency domain is studied based on time-frequency conversion theory,regularization technology,finite difference method and NLCG inversion algorithm.The problem of matrix singularity in the process of time-frequency conversion is solved.The transformation from time domain to frequency domain of transient electromagnetic response,as well as the three-dimensional forward and inversion of transient electromagnetic response frequency domain are realized successfully.

关 键 词：瞬变电磁 时频转换 正则化技术 三维正反演 有限差分法 网格剖分 

分 类 号：TD166[矿业工程—矿山地质测量] P631.325[天文地球—地质矿产勘探]