Marine Geoelectromagnetic Studies With Controlled Sources

V. Mogilatov
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Abstract

Marine geoelectromagnetic studies with controlled sources have a long history. Of course, we are talking about attempts to adapt on-land traditional methods. First of all, on the basis of a receiver-transmitter array in the form of two lines (ABMN array), that allowed to work in the motion. At the same time, a difficulty arose, that the signal was determined by the conductivity of the sea water layer, and it was difficult to isolate a useful anomalous signal. This problem was overcome in the CSEM. But it had an expensive price - a limitation of applicability (only in the deep sea) and use of very large distances. However, only CSEM is considered a recognized successful marine technology with a controlled source. The mentioned limitations of CSEM make it necessary to search for an alternative. We see such alternative in the use of an alternating TM field. Here various technical solutions are possible - a vertical electric line and a circular electric dipole, and we are discussing this.
可控源海洋地电磁研究
可控源的海洋地电磁研究有着悠久的历史。当然,我们谈论的是对陆地上的传统方法进行调整的尝试。首先,在接收-发射阵列的基础上以两条线路的形式(ABMN阵列),使其允许在运动中工作。同时,出现了一个困难,即信号是由海水层的电导率决定的,很难分离出有用的异常信号。这个问题在CSEM中得到了解决。但它也付出了昂贵的代价——适用性有限(仅在深海中),而且使用距离非常远。然而,只有CSEM被认为是一种公认的成功的海洋技术,具有可控的来源。上述CSEM的局限性使得有必要寻找替代方案。我们在交替TM场的使用中看到这样的替代。这里有各种各样的技术解决方案——一条垂直的电线和一个圆形的电偶极子,我们正在讨论这个。
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