瞬变电磁法在浅层勘探中的研究及应用*

对瞬变电磁法多匝小回线观测系统的物理实验。实验分为两步;首先,对同一回线装置的不同匝数的发射线框进行实验观测。其次,对发射与接收线框匝数相同的重叠回线装置进行观测试验。将实验数据处理,绘制出两种设备在不同匝数的线框的接收信号与线圈匝数关系图;多测道剖面图、电阻率测深图,对比两者的实验效果,分析两种设备装置的相似性和差异,讨论了同一回线与重叠回线两种装置的优劣;然后选定同一回线的最佳线框匝数的装置进行面积勘探,实验表明瞬变电磁的小回线装置在浅层勘探的效果显著,为瞬变电磁法在浅层勘探时的装置类型的选取提供一定的理论依据。

Research and Application of Transient Electromagnetic Method in shallow exploration

Through physical experiments on small transient electromagnetic method multiturn loop Observing System. Experiment was divided into two steps; First, Turns on the transmission frame of the same type of same small loop device for experimental observations. Secondly,Using the same turns of transmitting and receiving wireframe of the coincident loop device for experimental observations. Processing the experimental data, draw out the figure of the received signal with the number of turns , Multi-channel profile section, The resistivity sounding figure, contrast the experimental results, and analysis of the two devices similarities and differences between two devices, discussed the pros and cons of the same small loops and small coincident loop. And then choose the works best device for the area exploration. Experiments show that the effect of small loop transient electro magnetic device in shallow exploration is significant. We expectation this article can provides a theoretical basis for the transient electromagnetic method when it been used in shallow exploration.