| 三维MCSEM利用电磁场分解消除空气波效应 |
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| 引用本文： | 王书明,底青云,王若,苏晓璐,Mohamed A.三维MCSEM利用电磁场分解消除空气波效应[J].地球物理学报,2018,61(2):742-749. |
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| 作者姓名： | 王书明 底青云 王若 苏晓璐 Mohamed A |
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| 作者单位： | 1. 中国地质大学地球物理与空间信息学院, 地球内部多尺度成像湖北省重点实验室, 武汉 430074;2. 中国科学院地质与地球物理研究所, 北京 100029 |
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| 基金项目： | 国家自然科学基金（41574067），极低频探地工程地下资源探测分系统，国家高科技研究发展计划（863）（2012AA09A404）资助. |
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| 摘 要： | 对于浅水域可控源电磁勘探，在资料处理和解释过程中需要消除空气波影响，电磁场上下场分解方法是消除这种影响的一种有效手段.为了快速有效实现电磁场分解，假定电磁场沿水平方向变化缓慢，基于麦克斯韦方程组，本文推导了一种仅利用电磁场水平梯度实现电磁场分解新方法.数值试验表明利用这种分解方法可以得到稳定可靠的分解结果，同时论证了这种方法是一种海洋可控源电磁法（MCSEM）数据快速定性解释手段.
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| 关 键 词： | MCSEM 电磁场分解 空气波 水平梯度 |
| 收稿时间： | 2017-01-09 |
Removing airwave effects using electromagnetic fields decomposition for 3D MCSEM |
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| WANG ShuMing,DI QingYun,WANG Ruo,SU XiaoLu,Mohamed A.Removing airwave effects using electromagnetic fields decomposition for 3D MCSEM[J].Chinese Journal of Geophysics,2018,61(2):742-749. |
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| Authors: | WANG ShuMing DI QingYun WANG Ruo SU XiaoLu Mohamed A |
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| Institution: | 1. Hubei Subsurface Multi-scale Imaging Key Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China;2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | For marine controlled source electromagnetic (MCSEM) prospecting, it's necessary for us to remove airwave effects when the data are processed and interpreted, and electromagnetic up-going and down-going parts decomposition is a kind of effective technology. In order to quickly and efficiently implement such method, supposing that electromagnetic fields vary slowly along horizontal direction, this paper deduced a new method that only uses horizontal gradient of electromagnetic fields to decompose electromagnetic fields based on Maxwell's equations. The decomposition effects were verified by MCSEM modeling tests which indicates that we can obtain stable and reliable results using the new method, meanwhile demonstrates that the new method is also a kind of qualitative interpretation technology for MCSEM. |
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| Keywords: | MCSEM Electromagnetic decomposition Airwave Horizontal gradient |
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