多道瞬变电磁法(MTEM)虚拟波场提取技术  

Pseudo wavefield extraction in the multi-channel transient electromagnetic(MTEM)method

作　　者：钟华森 薛国强[1] 李貅[3] 智庆全 底青云[1] 

机构地区：[1]中国科学院地质与地球物理研究所矿产资源研究重点实验室,北京100029 [2]中国科学院大学,北京100049 [3]长安大学地质工程与测绘学院,西安710054 [4]中国地质科学院地球物理地球化学勘查研究所,河北廊坊065000

出　　处：《地球物理学报》2016年第12期4424-4431,共8页Chinese Journal of Geophysics

基　　金：国家重大科研装备研制项目"深部资源探测核心装备研发"(ZDYZ2012-1)-05子项目"多通道大功率电法勘探仪"-04课题"M-TEM资料处理及偏移成像软件研制;国家重点基础研究发展计划(973计划)(2012CB416605);国家自然科学基金(41474095)联合资助

摘　　要：多道瞬变电磁法(MTEM)是近年来发展起来的一种新的地球物理勘查技术,其数据采集方式与地震法类似,因此,采用瞬变电磁拟地震解释方法对MTEM数据进行处理解释具有一定的优越性.研究MTEM虚拟波场有效提取方法具有重要意义.在以往奇异值分解法、预条件正则化共轭梯度法两种不同的常规提取方法研究基础上,本文提出采用相关叠加法提取MTEM虚拟波场信息.首先采用预条件正则化共轭梯度法对全时段MTEM数据进行虚拟波场提取,然后采用同种方法对划分的各时间段数据进行虚拟波场提取,最后对全时段提取结果与各个时间段提取结果进行相关性叠加,叠加结果作为最终的提取结果.实测MTEM数据虚拟波场提取结果表明,采用相关叠加法可以得到稳定、光滑的虚拟波场波形曲线,且抗干扰能力强.The multi-channel transient electromagnetic（MTEM）is a new exploration method developed in recent years.The data acquisition mode of MTEM is similar to that of seismic methods so that pseudo-seismic interpretation technology is suitable for MTEM data.It is significant to research pseudo-seismic wavefield extracting technology for MTEM data.Based on the singular value decomposition（SVD） method and preconditioned regularized conjugate gradient method,we propose a correlation stacking method to extract pseudo-seismic wavefield of MTEM data.We firstly extract the pseudo-seismic wavefield from whole-time-domain MTEM data with the preconditioned regularized conjugate gradient method,then extract the pseudoseismic wavefield from the data of each time quantum determined with the same method.Finally,this method stacks the pseudo-seismic wavefield data according to their correlations,regarding the stacking result as the final extracting result.Comparison shows that the pseudo-seismic wavefield extracted from the measured MTEM data with the correlation stacking method is smoother than that of the SVD method or the preconditioned regularized conjugate gradient method.Besides,the anti-interference ability of this new method is stronger.

关 键 词：多道瞬变电磁法 虚拟波场提取 相关叠加法 

分 类 号：P631[天文地球—地质矿产勘探]