徐震寰^1,,
李予国^1,2,,
1. 海底科学与探测技术教育部重点实验室, 中国海洋大学海洋地球科学学院, 青岛 266100
2. 青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室, 青岛 266100

基金项目: 青岛海洋科学与技术国家实验室“问海计划”（2017WHZZB0201）和中国海洋大学海底科学与探测技术教育部重点实验室开放课题基金（SGPT-2019OF-09）联合资助


详细信息

作者简介: 徐震寰, 男, 1989年生, 博士研究生, 主要从事海洋电磁数据处理解释工作.E-mail:xzh19890104@126.com

通讯作者: 李予国, 男, 1965年生, 教授, 主要从事电磁场数值模拟和反演方法及海洋电磁法研究工作.E-mail:yuguo@ouc.edu.cn

中图分类号: P631

收稿日期:2018-07-02
修回日期:2018-10-11
上线日期:2019-12-05

The application of Spectral-Direction method in marine electromagnetic data processing

XU ZhenHuan^1,,
LI YuGuo^1,2,,
1. Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, College of Marine Geosciences, Ocean University of China, Qingdao 266100, China
2. Evaluation and Detection Technology Laboratory of Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266100, China


More Information

Corresponding author: LI YuGuo,E-mail:yuguo@ouc.edu.cn

MSC: P631

--> Received Date: 02 July 2018
Revised Date: 11 October 2018
Available Online: 05 December 2019


摘要
摘要:海底采集到的电磁数据按照其主要包含的信息及研究目的大致可分为海洋可控源电磁场（CSEM）信号、天然场源大地电磁场（MT）信号、海洋环境电磁场信号以及其他随机干扰信号.常常通过计算功率谱密度、时频分析和极化分析的方法研究海洋电磁场特征.本文介绍一种新方法——时频方向谱分析法及其在实测海洋电磁数据处理中的应用，该方法能够在一定的时间-频率尺度上有效分辨场源信号的运动方向.对于海洋CSEM数据，利用该方法可以估算发射源的运动方向，进而在发射源或采集站方位信息缺失情况下，实现海洋CSEM数据的旋转电性轴处理.对于海洋电磁数据，利用该方法可以详细分析海水运动感应电磁场的信号特征.
关键词: 时频方向谱分析/
海洋电磁数据处理/
海洋环境电磁场/
海洋可控源电磁法

Abstract:The electromagnetic data collected on the seabed can be roughly divided into the marine controlled-source electromagnetic field (CSEM) signal,the natural source magnetotelluric (MT) signal,the marine environment electromagnetic signal and random noises. The characteristics of marine electromagnetic fields were often studied by using power spectral density,time-frequency analysis and polarization analysis. In this paper,we introduce a new method namely the Spectral-Direction analysis method and present its application on marine electromagnetic survey data processing. This method can effectively resolve the direction of the field source on a certain time-frequency scale. For marine CSEM data,this method can be used to estimate the moving direction of the towed-transmitter,and then the rotational electric axis of the marine CSEM data can be processed in the absence of the azimuth information of the transmitter (or receiver). For marine electromagnetic data,this method can be used to analyze the signal characteristics of the motion induced electromagnetic field of seawater.
Key words:Spectral-Direction analysis/
Marine electromagnetic data processing/
Electromagnetic field of marine environment/
Marine CSEM



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