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通过理论研究和野外试验,总结了线源瞬变电磁法在熊耳山区深部勘查时使用的装置参数,并把该装置应用到龙门店矿K9矿脉的深部勘查中.线源瞬变电磁法装置最主要的参数是偏离距和线源的长度.理论上偏离距的大小只影响到瞬变衰减曲线首支幅值的高低和衰减的快慢.但在野外试验时发现当偏离距为500 m时,该方法产生了强激发极化效应,当偏离距为1000 m时,激发极化效应减弱.说明强激发极化效应仅在收发距较小时产生,实测表明偏离距大于840 m可以有效压制激发极化干扰.线源AB长度一般取1000~2000 m,当信噪比大时取小值.该装置在龙门店矿区的应用表明,线源瞬变电磁法装置轻便灵活,探测深度大,分辨率高,可多台接收机同时工作,经济快速,适合山区深部有色金属地质勘查工作.
Through theoretical research and field experiments, the device parameters used in the deep exploration of Xiongzishan area by line source transient electromagnetic method are summarized, and the device is applied to the deep exploration of the K9 vein in Longmendian Mine. The main parameters are the offset distance and the length of the line source. Theoretically, the size of the offset only affects the amplitude of the first branch of the transient attenuation curve and the speed of attenuation.However, when the deviation distance is 500 m, The method produces a strong excitation polarization effect, when the deviation distance is 1000 m, the excitation polarization effect weakened. That the strong excitation polarization effect occurs only when the transceiver distance is small, the measured distance is greater than 840 m can effectively suppress the excitation pole The interference of the line source AB length generally take 1000 ~ 2000 m, when the signal to noise ratio is large when the small value of the device in the Longmendian mine application shows that the linear source electromagnetic transient device is lightweight and flexible, the detection depth, resolution High, can be more than one receiver at the same time, fast economic, suitable for deep nonferrous metal geological exploration in mountainous areas.