Abstract: To counter the strong noise in the mine and to meet the requirement of great exploration depth,the strong source Transient Electro-magnetic (TEM) system is applied to the exploration of substituted resource of crisis-ridden large mine. The system adopts double signal synchronous stacking method to enhance the transmitted magnetic moment. In other words,it enhance the signal-noise ratio and enlarge the exploration depth by increasing transmitted current and using reasonable transmitter coil length. In practical exploration of the Fenghuangshan copper mine,Anhui Province,the two transmitters of the ATEM-Ⅱ system made by Jilin University were synchronously operated,increasing the transmitted current from 2.4A to 38.5A,and enhancing the SNR of late time transient signal from 0.275 to 2.93.In this way,the effective exploration depth may reach up to 650m. The results show that the strong source TEM system opens up broad prospects for the exploration of the substituted resources for large mine.

Key words: strong source TEM, industry noise, transmitted magnetic moment, signal to noise ratio, exploration depth

摘要： 针对矿山噪声强、要求勘探深度大的特点,应用强场源TEM测量仪器,采用双发射信号同步叠加增大发射磁矩,即通过增大发射电流和合理选择发射回线边长,提高瞬变信号晚延时的信噪比的方式提高有效勘探深度。在安徽铜陵凤凰山铜矿的实际勘探中,采用吉林大学研制的2个ATEM-Ⅱ型发射机同时工作,将发射电流由2.4A增大到38.5A,晚延时瞬变信号的信噪比由0.275提高到2.93,有效探测深度达到650m以上,表明强场源TEM测量仪器在寻找大型矿山接替资源勘探方面具有较好的发展前景。

关键词: 强场源TEM, 矿山噪声, 发射磁矩, 信噪比, 勘探深度