Response Characteristics and Its Prospecting Signs of Geophysical Well Logging in Xiaotongjiabuzi Gold Deposit, Eastern Liaoning Province
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摘要: 辽东地区是我国重要的黄金产区,实现深部找矿新突破已成为该区的重点研究任务.地球物理方法是发现和探测深部金矿的主要技术手段.为了精细刻画青城子矿集区地层结构,准确揭示深部矿化蚀变带物探异常特征,建立深部找矿物探解释标尺,在小佟家堡子金矿区ZK12-11孔开展了多参数地球物理测井和井中物探测量工作,结合钻孔岩心编录,利用直方图、交会图等技术分析了该孔300~990 m井段岩性和矿化蚀变带的响应特征,划分了钻孔岩性剖面和矿化蚀变层位.结果表明:自然伽马、电阻率、磁化率和极化率4种参数能够区分钻孔主要岩性,可以作为重建钻孔岩性剖面的主要依据;黄铁矿化层位黄铁矿含量不高,不足以引起地层电阻率的明显降低,石墨化是引起电阻率降低的主要因素;自然伽马高低过渡带与低阻高极化无磁异常带是小佟家堡子金矿区地球物理测井找金的找矿标志.地球物理测井能够有效圈定找金有利层位,更加精确地指导金矿深部找矿工作,应受到广泛重视.Abstract: Liaodong is an important gold producing area in China, and it has become a key research direction to achieve a new breakthrough in deep prospecting here. Geophysical method is the main technical means to discover and detect deep gold deposits. In order to finely characterize the stratigraphic structure of Qingchengzi ore concentration area, accurately reveal the geophysical anomalous characteristics of deep mineralized alteration zone, and establish the geophysical interpretation scale for deep prospecting, multi-parameter geophysical logging and borehole geophysical survey were carried out in ZK12-11 hole in Xiaotongjiabuzi gold mining area. Combined with drill core logging, the response characteristics of lithology and mineralized alteration zone of 300-990 m well section of the hole were analyzed by histogram and crossplot, and the drilling lithology profile and mineralized alteration layer were divided. The results show that the four parameters of natural gamma, apparent resistivity, magnetic susceptibility and polarizability can distinguish the main lithology of borehole, and can be used as the main basis for reconstructing the lithology profile of borehole. The content of pyrite in the pyritization layer is not high enough to cause the decrease of formation resistivity. Graphitization is the main factor causing the decrease of resistivity. The natural gamma high-low transition zone and the low resistivity and high polarization non-magnetic anomaly zone are the prospecting signs of geophysical logging for gold prospecting in Xiaotongjiabuzi gold deposit. Geophysical logging can effectively delineate favorable horizons for gold prospecting, and guide the deep prospecting work of gold deposit more accurately, which should be paid extensive attention.
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图 1 辽东半岛青城子矿集区地质简图
a. 华北克拉通的大地构造位置,改自于婳等(2021);b. 辽吉裂谷带构造示意图,改自于婳等(2021);c. 青城子矿集区地质简图,改自刘洪津等(2013)
Fig. 1. Geological sketch of Qingchengzi ore concentration area in Liaodong peninsula
表 1 ZK1211孔主要岩性物性
Table 1. Statistics of physical properties of major lithologies in hole ZK12-11
岩性 自然伽马(API) 电阻率(Ω·m) 磁化率(10-5 SI) 极化率(%) 主要范围 平均值/中值 主要范围 平均值/中值 主要范围 平均值/中值 主要范围 平均值/中值 黑云变粒岩(盖县组) 100~140 123.9/124.7 20~800 211.2/145.9 0~40 15.65/11.78 0~18 5.78/4.74 黑云变粒岩(大石桥组) 20~100 65.3/56.6 1 200~2 500 1 460.6/1 746.7 0~16 4.24/4.09 0~3 0.81/0.39 大理岩 20~60 48.7/46.5 500~2 000 954.8/915.8 0~10 4.28/2.94 0~4 1.20/1.14 浅粒岩 10~40 25.5/25.1 2 000~2 500 2 359.3/2 347.8 0~3 1.45/1.37 0~0.4 0.15/0.15 斜长花岗岩 20~40 28.9/27.9 2 000~2 500 2 273.2/2 315.5 0~2 1.07/1.06 0~0.4 0.17/0.15 表 2 典型矿化蚀变带及其物性统计表
Table 2. Statistical table of typical mineralized alteration zones and their physical properties
地层 岩性 矿化类型 顶深
(m)底深
(m)层厚
(m)电阻率
(Ω·m)极化率
(%)磁化率
(10-5 SI)大石桥组 大理岩 黄铁矿化 612.75 614.60 1.85 948.4 0.90 23.06 石榴石云母片岩 黄铁矿化 773.90 782.30 8.40 1 440.8 1.07 26.52 黑云变粒岩 黄铁矿化 972.50 979.45 6.95 1 020.5 1.09 12.85 石墨化 652.20 667.60 15.40 34.5 12.25 4.28 盖县组 黑云变粒岩 黄铁矿化石墨化 535.92 537.16 1.24 12.0 17.69 39.40 黄铁矿化石墨化 540.48 542.88 2.40 11.9 20.67 35.50 黄铁矿化石墨化 544.52 545.24 0.72 26.5 24.15 43.80 黄铁矿化石墨化 549.12 550.96 1.84 29.7 19.46 20.20 表 3 ZK12-11孔岩心样品及测试结果
Table 3. The location and core test results of core samples of hole ZK12-11
样品编号 采样位置
(m)厚度
(m)分析品位(10-6) 矿体编号 顶深 底深 Au Ag H41~44 335.2 339.2 4.0 H45~49 381.4 386.0 4.6 H50~52 411.4 414.4 3.0 H53~55 428.2 431.2 3.0 H56~59 448.2 452.0 3.8 H60~72 479.2 492.0 12.8 H73~88 557.3 574.5 17.2 H89 574.5 575.9 1.4 0.33 275.00 Ⅰ1 H90~101 575.9 588.1 12.2 H102~103 588.1 590.1 2.0 0.88 272.50 Ⅰ H104~162 590.1 654.4 64.3 H163~178 654.4 669.8 15.4 1.91 20.94 Ⅱ H179~228 669.8 722.0 52.2 H229~234 759.0 766.0 7.0 H235~239 789.6 794.4 4.8 H240~265 856.4 884.9 28.5 H266~271 917.0 923.1 6.1 H272~275 926.5 930.7 4.2 H276~308 939.0 973.4 34.4 注:金小于0.1×10-6未单独列出. -
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