Application of Electrical Joint Interpretation Method in Mineral Exploration of Coverage Areas
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摘要: 覆盖较厚的区域地球物理异常较弱, 尤其是危机矿山二次空间探矿的人文干扰较大, 从而使找矿难度增加.为了开展覆盖区隐伏矿产资源的勘查工作, 应用信号较强的人工源工作方式, 分别采用瞬变电磁法、可控源音频大地电磁法和激发极化法在同一矿区进行勘查.在理论上分析了这3种方法结合的优势, 使3种方法在深度电阻率断面上互相校正、互相补充.在甘肃某区进行金属矿勘查时, 采用3种方法组合进行联合解释, 取得了较好的探矿效果, 表明多电法综合进行覆盖区找矿是一种行之有效的途径.Abstract: The geophysical anomalies are very weak in mineral prospecting of the areas with thick covering layer, especially in the second exploration of crisis mines where the cultural disturbances are strong, which makes it more difficult for ore prospecting. In order to carry out the explorations for hidden ore deposits in coverage areas, we adopt three methods with artificial source, namely, transient electromagnetic method (TEM), controlled source audio-frequency magnetotelluric (CSAMT) and induced polarization (IP) respectively, whose signals are strong enough for prospecting in the working areas. In addition, we have analyzed the advantages of the combination of these three methods in theory. It is found that the three methods can not only complement with one another in depth but also correct one another in interpretation. The electrical joint interpretation method has achieved a satisfying result in metal prospecting in Gansu Province, where these three methods complement and validate each other well. Therefore, the electrical joint interpretation method provides an effective way for mineral exploration in coverage areas.
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图 1 TEM静校正前后CSAMT视电阻率曲线
a.有静态效应影响的CSAMT视电阻率曲线；b.做TEM静校正后CSAMT视电阻率曲线
Fig. 1. The results before and after statics correction based on TEM
图 2 TEM静校正效果
a.未做静校正CSAMT视电阻率断面图；b.静校正后CSAMT视电阻率断面图
Fig. 2. The statics correction results based on TEM
图 3 极化率与视电阻率综合解释成果
a.极化率断面图；b.瞬变电磁视电阻率断面图
Fig. 3. The joint interpretation results with resistivity and polarizability
图 4 电法联合解释应用效果
a.激电测深极化率断面图；b.瞬变电磁测深视电阻率断面图；c.CSAMT视电阻率断面图
Fig. 4. The results of the electrical method join interpretation
图 5 二矿区152线激电与瞬变电磁结果对比
a.152线激电测深极化率断面图；b.152线瞬变电磁视电阻率断面图
Fig. 5. The comparison between IP and TEM results in the second mineral area
图 6 瞬变电磁二矿区第10道切平面(t=440.8 μs)
Fig. 6. The ichnography of TEM results at 440.8 μs at the second area
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