APPLICATION OF OMNIDIRECTIONAL INDUCED POLARIZATION LOGGING IN PROSPECTING OF GOLD DEPOSITS: A Case Study of Zhaoxian Area in Shandong Province
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摘要:
与地面激发极化法相比，井中激电测井方法测量电极更接近矿体，因而具有更高的信噪比，勘探精度更高，在金属矿普查和勘探中应用广泛.通过该方法在山东省莱州市招贤地区金矿普查中的应用实例，研究讨论了其在金矿普查中的实际效果.结果表明，金矿、多金属矿富集岩段表现为低电阻率高极化率，异常特征明显.该方法可以判断矿体展布规律及分布状态，指导矿化体钻探追索方向，具有明显的地质效果.
Abstract:Compared with the ground induced polarization (IP) method, the well IP logging is much closer to orebody, and thus it has higher signal-to-noise ratio and exploration precision, which is widely used in the survey and exploration of metal minerals. Based on the application of the method in the prospecting of gold deposits in Zhaoxian area of Laizhou City, Shandong Province, the paper discusses the practical effects of IP logging in gold deposit exploration. The results show that the rocks with enriched gold and polymetallic ores are characterized by low resistivity, high polarizability, and distinct anomaly. The method can judge the distribution rule and state of orebody, and guide the drilling direction of mineralized body, with obvious geological effects.
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Key words:
- gold deposit exploration /
- concealed orebody /
- IP logging /
- ground-well logging /
- Shandong Province
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表 1 岩心物性测定成果统计表
Table 1. Physical property measurement results of cores
序号 岩石名称 块数 ρmin /Ωm ρmax/Ωm ρ平均值/Ωm ηmin/% ηmax/% η平均值/% 1 二长花岗岩 49 1163 13541 6281 0.88 6.06 3.11 2 花岗质碎裂岩 47 741 8583 3078 1.36 7.47 3.49 3 绢英岩化花岗岩 16 7392 15078 10733 2.47 8.42 4.80 4 黄铁绢英岩化碎裂岩 20 368 2705 1619 4.19 68.25 19.7 5 绢英岩化花岗质碎裂岩 29 654 8224 3599 2.56 26.51 9.65 6 闪长玢岩 12 6938 15285 10489 1.67 3.21 2.34 7 硅化绢英岩化花岗岩 16 1459 25085 12461 1.36 13.55 5.54 8 黑云斜长片麻岩 4 1238 21860 11439 1.10 5.10 2.58 
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