Abstract: Because of the difficulties to obtain the conductivity of the rock on the seafloor, no marine electromagnetic prospecting has been done in the field of geophysical prospecting in China till now. But the electrical parameter is the better one in reflecting the lithology and physical state of rock than some other parameters. The development of marine electromagnetic method is strongly needed. The marine magnetotellurics, which studies the distribution of conductivity of medium in different depths through collecting magnetotelluric data on the seafloor, is proved to be an effective method. After two years of hard work, we have accomplished the study of marine magnetotelluric prospecting. Due to the rapid development of society, the need for mineral and energy resources is presently increasing fast, which leads to the decrease of the deposit of important mineral, oil and natural gas, and the lack of the targets for prospecting and exploiting on the land. Relatively, the abundant sea resource is rather attractive. Therefore it is imperative to develop the methods for prospecting the resources on the seafloor in China Sea, which will provide the broad applied prospects for the marine electromagnetic methods.

Key words: Marine magnetotelluric method, Electrical structure

摘要： 几年以前,我国尚未独立开展过海洋电磁探测,没有获取海洋岩石层电性资料的技术手段。然而,地下岩层的电性参数较之其他物性参数能更好地反映岩石的性质以及岩石所处的物理状态,因此迫切需要发展海底大地电磁探测技术。海底大地电磁探测是把仪器布置在海底,采集海底大地电磁场数据,从而研究海底以下不同深度上介质导电性的分布规律,达到了解地下不同深度地质情况的目的。经过两年的努力,我们已基本实现了海底大地电磁探测技术的研究目标。

关键词: 海底大地电磁探测, 地壳电性结构, 卫星同步