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The thinking about applying borehole logging data to deep ore-prospecting prediction |
Chun-Hua XU, Xin-Long QIN, Jian CUI, Zhen-Ning CHEN, Xiao-Niu XIAO, Xiao WU, Jun TANG, Lei ZHANG |
East China Geological Exploration Bureau for Nonferrous Metals in Jiangsu Province, Nanjing 210007, China |
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Abstract Deep prospecting has always been difficult and ineffective. Logging as an important means of prospecting for metal ores has been used for many years, but its deep prospecting application is still in the exploration stage, and its effect also needs evaluation. In this paper, the authors took the mining borehole log data from the Fengyan-Xiekeng ore district of Meixian Town in Youxi County of Fujian Province as the research object by analysis of the tri-component magnetic survey, resistivity logging,and IP logging method application effect of deep prospecting in this area. Through the comparison of core observation and analysis, the identification effect of mineralization section and various logging response characteristics were analyzed comprehensively. It is thought that among several logging methods, the resistivity logging is relatively effective in search for lead-zinc deposits, whereas magnetic survey is effective for lead-zinc ore block with high ore grade. On the whole, the two kinds of logging methods are respectively effective to a certain extent, but their effects in search for deep molybdenum ares are not ideal, with no corresponding relationship. Based on a comprehensive analysis of the logging application for deep ore prospecting in this area, the authors hold that, for deep prospecting, researchers should analyze well logging application conditions. In the process of mineral exploration, a more effective means of logging detection should be used to find the corresponding relationship with mineralization, which can help reduce the blindness of regional prospecting work. In the borehole suitable for the exploration conditions, well logging is somewhat effective in the detection and prediction of deep orebody, determination of the attitude and the size of the orebody and locating of its spatial location. Generally, the logging method can play a supplementary role and can improve prospecting success rate.
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Received: 23 December 2017
Published: 24 October 2018
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地层 | 厚度/m | 主要岩性 | 第四系(Q4) | 5~10 | 粉质黏土、粉砂质黏土,基石转石等 | 侏罗系上统长林组(J3c) | >200 | 泥质粉砂岩、厚层砂砾岩、凝灰质细砂岩、角闪安山岩、安山玄武岩等,底部有一层角砾岩 | 侏罗系下统梨山组(J1l) | 不详 | 千枚状粉砂岩、页岩、砂岩 | 震旦系上统 | 大岭组上段(Z2dl2) | 不详 | 变质石英砂岩、石英岩、千枚状粉砂岩、千枚岩 | | | 大岭组下段(Z2dl1) | >30 | 上部石英斜长片岩夹绢云母片岩,下部石英云母片岩、绢云母片岩 | 震旦系下统 | 龙北溪组上段(Z1l3) | 约100 | 绿片岩夹薄层大理岩,含数层多金属硫化物矿体 | | | 龙北溪组中段(Z1l2) | 约150 | 上部云母石英片岩夹薄层大理岩,下部巨厚白云质大理岩夹云母石英片岩 | 龙北溪组下段(Z1l1) | | (矿区内未见) |
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编号 | 形态 | 产状 | | | | | | 矿石矿物 | 矿石构造 | Ⅰ | 似层状 | 50°~55°; NW∠35° | 380 | 5.32 | 1.79 | 3.52 | 125.0 | 闪锌矿为主, 方铅矿少量 | 团块状,稠密浸染状、 局部块状构造 | Ⅲ | 似层状 | 走向40° | 不详 | 最大9.1 | 0.83 | 0.43 | 27.5 | 氧化铅锌矿、软锰矿 | 块状、粉土状 | Ⅳ | 似层状 | 25°~30°; SE∠44°~72° | 400 | 2.92 | 4.22 | 0.76 | 36.7 | 地表氧化铅锌矿为主, 少量原生铅矿量 | 浸染状、块状 | Ⅴ | 似层状 | 35°; SE∠24° | 300 | 3.66 | 2.56 | 0.16 | 30.5 | 地表为铅矾、锰土等 氧化矿;深部为生 铅锌硫化物 | 地表为土状;深部为 浸染状、块状构造 | Ⅵ | 透镜状 | 20°;SE∠36° | 100 | 9.90 | 1.75 | 1.06 | 27.3 | 闪锌矿、方铅矿 | 致密浸染状、块状 |
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时代 | 地层 | 岩性 | 磁化率/(10-5SI) | 剩余磁化强度/(10-3A/m) | 磁性 分层 | 电阻率/(Ω·m) | 电性 分层 | n | A | | n | A | | n | A | | 侏罗系 | 长林组 (J3c) | 碎屑岩 安山岩 | 83 | 1~68 | 8 | | | | 无磁—弱磁 | 82 | 8~50769 | 998 | 低阻 | 16 | 5~384 | 50 | | | | 15 | 877~24690 | 5491 | 高阻 | 震旦系 | 大岭组 (Z2dl) | 石英片岩、 云母片岩 | 10 | 12~19 | 15 | | | | 11 | 435~11961 | 2318 | 龙北溪 组(Z1l) | 大理岩 | 31 | 1~3 | 2 | | | | 31 | | 1113~58552 | 9784 | 绿片岩(含 Pb、Zn矿化) | 11 | 42~96 | 70 | | | | 11 | 648~15729 | | 3926 | 石英片岩、 云母片岩 | 52 | 8~518 | 34 | 1 | | 160 | 51 | 98~38662 | | 4125 | 侵入岩 | 花岗斑岩、石英斑岩 | 54 | 0~105 | 6 | | | | 中等磁性 | 53 | 171~61146 | 2401 | 低、中阻 | 闪长花岗斑岩 | 18 | 10~2658 | 66 | 5 | 1~192 | 13 | 18 | 1120~57684 | 6674 | 中、高阻 | 闪长玢岩 | 13 | 280~3668 | 1494 | 9 | 1~845 | 32 | 12 | 1091~8748 | 2510 | 铅锌矿石(7块弱磁) | 22 | 52~87745 | 2725 | 7 | 190~6190 | 927 | 强磁性 | 22 | 1~4758 | 21 | 低阻 | 绿片岩(矿化) | 13 | 115~72860 | 202 | 7 | 1-5595 | 302 | 13 | 4~49133 | 1275 |
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