底青云1,2,3,4,,,
高雅1,2,3,4,
付长民1,2,3,4
1. 中国科学院深地资源装备技术工程实验室, 中国科学院地质与地球物理研究所, 北京 100029
2. 中国科学院页岩气与地质工程重点实验室, 中国科学院地质与地球物理研究所, 北京 100029
3. 中国科学院地球科学研究院, 北京 100029
4. 中国科学院大学, 地球与行星科学学院, 北京 100049
基金项目: 国家自然科学基金（41874088）和中国科学院科研仪器设备研制项目（ZDZBGCH2018006）联合资助
详细信息
作者简介: 郑方华, 男, 1995年生, 研究生, 主要从事极低频电磁探测方法研究.E-mail: zhengfanghua18@mails.ucas.ac.cn
通讯作者: 底青云, 女, 研究员, 博士生导师, 主要从事地球物理方法技术研究.E-mail: qydi@mail.iggcas.ac.cn
中图分类号: P631收稿日期:2020-08-24
修回日期:2021-04-12
上线日期:2021-06-10
Frequency response characteristics of WEM in seafloor
ZHENG FangHua1,2,3,4,,DI QingYun1,2,3,4,,,
GAO Ya1,2,3,4,
FU ChangMin1,2,3,4
1. CAS Engineering Laboratory for Deep Resources Equipment and Technology, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2. Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
3. Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing 100029, China
4. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
More Information
Corresponding author: DI QingYun,E-mail:qydi@mail.iggcas.ac.cn
MSC: P631--> Received Date: 24 August 2020
Revised Date: 12 April 2021
Available Online: 10 June 2021
摘要
摘要:极低频电磁探测方法（WEM）是一种新型人工源低频电磁探测技术，目前尚未见极低频电磁探测方法的海区研究，缺少相关经验.为测试WEM在海洋环境中的电磁响应特征，本文将"地-电离层"全空间电磁波传播理论应用到含海水介质的"地-电离层"全空间模型，由地表处数值格林函数出发，利用空气层与海水层界面谢昆诺夫势函数满足的边界条件，推导了海底界面的场强表达式.采用高采样密度的Hankel数字滤波方法进行数值模拟计算.为探究WEM在海洋油气资源探测中的适用性，建立简化海洋地电模型，通过分析WEM对不含异常体的背景场和含高阻油气异常体时的电磁响应曲线差异来检测WEM探测海底高阻油气层的可行性.并讨论不同观测方式、不同收发距以及海水层厚度、油气层埋深和油气藏厚度对WEM电磁响应特征的影响.研究结果表明，WEM可在数百千米收发距下探测浅海区域海底下方电性异常体的存在.
关键词: 极低频电磁探测/
海洋油气勘探/
大收发距/
电磁波场/
数值模拟
Abstract:Wireless electromagnetic method (WEM) is a new controlled-source electromagnetic method. At present, there are no research results on the application of WEM in the sea area. In order to study the applicability of WEM in the exploration of marine oil and gas resources, the author extended the theory of "earth-ionosphere" mode to the model that includes seawater, and deduced the expression of the electromagnetic field when the observation point is located at the seabed. And the Hankel digital filtering method with high sampling density is used for numerical simulation. By simplifying the geological model, the electromagnetic responses of WEM to the background model and oil and gas model are compared and analyzed, so as to verify the feasibility of WEM in detecting oil reservoirs in the marine area. On this basis, the author studied the electromagnetic response characteristics of the target body under different model parameters. The results show that WEM can obtain good results for the detection of high-resistivity oil and gas reservoirs with a certain scale buried in shallow seas.
Key words:Wireless electromagnetic method/
Marine oil and gas exploration/
Long offset/
Electromagnetic field/
Numerical simulation
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