地球物理学进展 ›› 2017, Vol. 32 ›› Issue (6): 2717-2722.doi: 10.6038/pg20170657

• 应用地球物理学Ⅱ • 上一篇    

海洋可控源电磁勘探中双对称发射波形的优化

周文强1, 周鹏1, 金少华2, 戴永寿1   

  1. 1. 中国石油大学(华东)信息与控制工程学院, 山东青岛 266580;
    2. 浙江省绍兴市上虞区产品质量监督检验所, 浙江绍兴 312300
  • 收稿日期:2017-04-08 修回日期:2017-10-17 出版日期:2017-12-20 发布日期:2017-12-20
  • 通讯作者: 周鹏,男,1976年生,副教授,主要从事信号与信息处理研究.(E-mail:zhoupeng@upc.edu.cn) E-mail:zhoupeng@upc.edu.cn
  • 作者简介:周文强,男,1991年生,硕士研究生,主要从事海洋可控源电磁勘探中MT噪声的降噪方法研究.(E-mail:zhouwenqiangupc@126.com)
  • 基金资助:

    中国石油集团东方地球物理勘探有限责任公司委托项目“海洋可控源电磁勘探中MT噪声的降噪方法研究”资助.

Optimization of doubly symmetric transmitting waveform for marine controlled source electromagnetic exploration

ZHOU Wen-qiang1, ZHOU Peng1, JIN Shao-hua2, DAI Yong-shou1   

  1. 1. College of Information and Control Engineering, China University of Petroleum, Shandong Qingdao 266580, China;
    2. Product quality Supervision and Inspection Institute, Shangyu District, Zhejiang Shaoxing 312300, China
  • Received:2017-04-08 Revised:2017-10-17 Online:2017-12-20 Published:2017-12-20

摘要:

海洋可控源电磁勘探(Marine Controlled-Source Electromagnetic,MCSEM)是一门新兴的海洋油气勘探技术.在MCSEM测量中最常采用的发射信号就是方波信号,但方波信号各谐波成分的能量随着奇次谐波次数n的增加严重衰减,这可能使得很多谐波成分在有效传输距离内检测不到.为了有效提高MCSEM信号的信噪比,学者D.Myer对发射波形进行了优化,提出了一种双对称波形.但D.Myer针对双对称波形只是进行了初步的理论分析并没有进行实验验证,本文对双对称波形的实现提出了合理的实验方案,并从中选取了最优波形.

Abstract:

Marine Controlled-Source Electromagnetic (MCSEM) method is a relatively young geophysical method for seafloor oil and gas prospecting. The most commonly used transmitting signal in MCSEM is a square wave signal, but the energy of the harmonic components attenuates with increasing n, which may cause many harmonic components to be undetected within the effective transmission distance. In order to effectively improve the signal-to-noise ratio of MCSEM signal. D.Myer has proposed a kind of doubly symmetric waveform and made preliminary theoretical analysis. But doubly symmetric waveform hasn't been experimental verified. In this paper, a reasonable experimental scheme is proposed for the realization of the doubly symmetric waveform, and the optimal waveform is selected from it.

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