AMT法指导铜矿深部勘查的可行性
Feasibility Analysis of Audio Magnetotelluric Method for Guiding the Copper Prospecting in Depth
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摘要: AMT法是通过观测由地表不同频率电磁波信号以确定地下的电阻率值的方法, 具有对低阻体分辨率较好的优点, 高效，成本低，适于资源勘探, 是重要的地球物理勘探手段。音频大地电磁法（AMT）是资源勘探中一种重要的地球物理方法，对于低阻体有较好的分辨效果。AMT法尽管具有对低阻体分辨率较好且探测深度大的优点, 并有高效、成本低，受地形条件影响小的优点；其缺点是场源不可控制且信号微弱, 易受自然及人为环境的影响, 尤其是人为干扰严重的地区。在人为干扰严重的地区可采用CSAMT法，即可控源音频大地电磁测深法。笔者介绍了AMT法在甘肃某区铜矿勘探中的应用。矿化蚀变带（矿体）一般沿裂隙或岩性接触带发育，在视电阻率断面图中表现为梯度变化带。AMT法能较准确的反应铜矿体的分布情况，对下步的地质工作具有较好的指导意义。Abstract: AMT is different from the surface by observing the frequency of the electromagnetic signal to determine the value of underground resistivity method has low resistivity body, the advantage of better resolution, high efficiency, low cost, suitable for resource exploration, geophysical exploration is an important means. Audio magnetotelluric method (AMT) is an important resource exploration geophysical methods for low resistivity body it has better resolving effect. AMT law despite having low resistivity body better resolution and depth of great advantage, and has high efficiency, low cost, terrain conditions on small advantages; the drawback is uncontrollable and field source signal is weak, vulnerable to natural and man-made environmental impact, especially in areas of severe human disturbance. Disturbance-hit areas can CSAMT method, you can control the source audio magnetotelluric sounding method.This article describes the application of AMT law in a district of Gansu Copper Exploration. Mineralized alteration zones (ore) generally along fractures or lithological contact zone development, the performance of gradient zone in apparent resistivity section in FIG. AMT method can more accurately reflect the distribution of the ore body, it has good guidance for further geological work.
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