海洋环境中水平电偶极子电磁场特征分析  

Propagation of electromagnetic fields from a horizontal electrical dipole buried in ocean

作　　者：贾定宇[1] 翁爱华[2] 刘云鹤[2] 殷长春[2] 

机构地区：[1]中国地质科学院地球物理地球化学勘查研究所,廊坊065000 [2]吉林大学地球探测科学与技术学院,长春130026

出　　处：《地球物理学进展》2013年第1期507-514,共8页Progress in Geophysics

基　　金：国家自然科学基金项目(40874050)资助

摘　　要：海洋环境中人工源电磁信号可以用来进行海洋资源勘查、钻前储层评价以及海洋环境中的通信,具有重要的研究意义.为了研究可控源装置在海洋环境中产生的电磁响应特征,本文针对典型海洋层状导电模型,利用由虚界面法获得的电磁场表达式,结合离散复镜像法实现了长导线源产生的电场和磁场的计算.通过数值计算结果可以看出:1)不同的场分量的空间分布规律不同;2)不同方向的Ex分量相对Hy分量受空气波的影响较小,故海洋电磁法勘探应选用Ex分量测量,而海洋通讯系统应选择接收Hy信号;3)同线方向Ex分量相对于赤道方向对海底高阻层的反映明显.本文的研究内容对海洋可控源电磁法测量方式的选择以及通信技术的研究具有指导意义.Marine controlled source electromagnetic signal could be used to explore mineral resources, predrill reservoir appraisal and communicate technology in ocean. In order to study the propagation of the controlled source fields electromagnetic in the marine environment, this paper accepts the virtual interface method combined with discrete complex image method. The fields generated by a long wire electric source could be looked as a dipole when the wire length approaches zero. The method is applied to the typical 3-layered resistivity marine model. The numerical results show that .- 1） Different electromagnetic field components have different spatial distribution. 2） E~ components in different direction are less affected by airwave than Hy components. So that the Ex components is better choice for marine electromagnetic exploration, while Hy components are suitable to the communication technology in the marine environment. 3） Inline E~ component is more sensitive to the reservoir layer than equator side Ex. This paper gives a guide to configure the marine controlled source electromagnetic measurement and marine communication technology.

关 键 词：水平电偶极 海洋电磁法 层状模型 离散复镜像法 电磁波传播 

分 类 号：P318[天文地球—固体地球物理学] P738[天文地球—地球物理学]