直升机TEM系统关键技术指标与探测深度分析

直升机TEM系统在国际上正处于开发实验阶段,还需2~3年时间才可投入商业应用.该系统即灵活、又有一定的勘探深度,在国外已经取得了一定的勘查效果,因此,它是今后航空电磁测量技术的发展趋势.直升机TEM系统的灵活性符合中国多山的勘查条件,而它的勘探深度有多大是急需弄清的另一个关键的问题.本文利用水平层状大地模型计算出的瞬变响应,分析了装置类型、磁矩、噪声与探测深度的关系,并得出了直升机TEM系统,在中国几种典型水文地电模型条件下的最大勘探深度,这对于论证我国是否发展直升机TEM系统提供了理论依据.

An Analysis of Pivotal Technique Specification of the Helicopter TEM System and Its Detection Depth

The Helicopter TEM system remains in the stage of development and experimentation in the world, and is likely to be used in commercial exploration in about two or three years. With its flexibility and a certain detection depth, this system has got some good prospecting results. It has therefore become the development trend of the air-borne electromagnetic survey technique in future. Is this system suitable to the concrete situation of China? It is the air-borne electromagnetic technicians who can answer this question. The flexibility of the helicopter TEM system make it suitable to mountainous conditions of China, but its detection depth remains a key question which needs to be solved. Based on the horizontal sandwich earth model, the authors calculated transient electromagnetic response and analyzed the relation of the installation, moment and noise to the detection depth. As a result, the maximum detection depths of the helicopter TEM system are obtained under the condition of several typical geoelectric models of China, and the theoretical basis for the development of the helicopter TEM system in China is provided.