基于三维有限元的航空大地电磁倾子响应特征  

Research on response characteristics of airborne magnetotelluric tipper based on three-dimensional finite element

作　　者：刘彦涛 彭莉红[1,2,3] 孙栋华 张伟盟 王海红 LIU Yan-Tao;PENG Li-Hong;SUN Dong-Hua;ZHANG Wei-Meng;WANG Hai-Hong(Airborne Survey and Remote Sensing Center of Nuclear Industry,Shijiazhuang 050002,China;Key Laboratory of Uranium Resources Geophysical Exploration Technology,China Nuclear Industry Group Company,Shijiazhuang 050002,China;Hebei Key Laboratory of Airborne Survey and Remote Sensing Technology,Shijiazhuang 050002,China)

机构地区：[1]核工业航测遥感中心,河北石家庄050002 [2]中核集团铀资源地球物理勘查技术(重点实验室),河北石家庄050002 [3]河北省航空探测与遥感技术重点实验室,河北石家庄050002

出　　处：《物探与化探》2021年第5期1329-1337,共9页Geophysical and Geochemical Exploration

摘　　要：倾子是航空大地电磁数据解释的重要参数,研究倾子响应特征对数据解释具有重要意义。文中介绍了航空大地电磁基本原理与ZTEM航空大地电磁数据采集系统,利用三维有限元方法对简单异常体倾子响应进行了模拟,分析测线与岩性分界面斜交情况下倾子Tx与倾子Ty的响应特征。研究结果表明:当测线与岩性分界面斜交时,倾子Tx与倾子Ty响应皆存在且对岩性分界面有所反映,随测线方向改变,倾子表现出相应规律。本文研究进一步加深了倾子对岩性分界面响应特征的理解,可为倾子资料解释提供参考与依据。Tippers are important parameters for the interpretation of airborne magnetotelluric data,and the study on the response characteristics of tippers is of great significance for the data interpretation.This study firstly introduces the basic principle of airborne magnetotelluric and ZTEM airborne magnetotelluric data acquisition system,then simulates the tipper response of the simple abnormal bodies using the three-dimensional finite element method,and finally analyzes the response characteristics of tippers Tx and Ty when the survey lines obliquely intersect with a lithologic interface.As indicated by the results,both Tx and Ty responded to the lithological interface in the case that the survey lines obliquely intersected with a lithologic interface.Meanwhile,the tipper exhibited corresponding laws with the change in the direction of the survey lines in that case.This study further deepens the understanding of the response of tipper to lithologic interfaces and will provide references and guidance for the interpretation of tipper data.

关 键 词：倾子 航空大地电磁 三维有限元 ZTEM 

分 类 号：P631[天文地球—地质矿产勘探]