| 宝兴沟金矿地球物理测井响应特征及找矿标志 |
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| 引用本文：杜海双,陈洪鹏,王梦琦,周传芳,张天恩,万珏昶.2026.宝兴沟金矿地球物理测井响应特征及找矿标志[J].地球学报,47(4):939-950. |
| DOI：10.3975/cagsb.2025.082011 |
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| 基金项目:本文由中国地质调查局项目(编号: DD20242753)资助。 |
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| 中文摘要:大兴安岭地区作为我国重要的Au(Cu-Mo)成矿带, 历经长期的矿产开发与勘查实践, 现阶段该区域地质勘探工作的核心科学问题聚焦于通过创新勘查技术方法实现深部及外围隐伏矿体的找矿突破。本文以宝兴沟金矿为例, 选择ZK0706验证钻孔, 集成多参数地球物理测井与井中物探技术, 结合790 m全孔段岩心数字化编录数据, 采用直方图与多参数交会图技术, 定量解析了110~790 m垂向空间内闪长岩、闪长玢岩-蚀变岩带的地球物理场响应规律, 建立了岩性识别阈值, 划分了钻孔岩性剖面和矿化蚀变层。研究成果表明: 基于自然伽马、电阻率、磁化率与电极电位四类测井参数组合, 可构建闪长岩-蚀变岩系岩性识别模型, 为隐伏矿体三维定位提供关键地球物理判据。定量解析揭示: 宝兴沟矿区黄铁矿化强度与电阻率异常无显著相关性, 而硅化碎裂带发育程度与电阻率降幅呈现耦合特征。研究建立了“低阻-中高伽马-多峰高值电极电位”异常组合的宝兴沟金矿区地球物理测井找金标志。该成果不仅能够有效圈定赋金有利层位精确指导金矿深边部找矿工作, 更为实施2 000 m以深勘探工程部署提供了依据。 |
| 中文关键词:宝兴沟 金矿 测井 岩性响应特征 找矿标志 |
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| Response Characteristics and Prospecting Signs of Geophysical Well Logging in the Baoxinggou Gold Deposit |
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| Abstract:As an important Au (Cu-Mo) metallogenic belt in China, the Great Hinggan Mountains region has undergone prolonged mineral development and exploration. The current core scientific challenge in geological prospecting is achieving breakthroughs in locating deep and peripheral concealed ore bodies through innovative exploration technologies. Taking the ZK0706 verification borehole in the Baoxinggou gold deposit as an example, by integrating multi-parameter geophysical logging and in-well geophysical exploration techniques, in combination with digital core recording data of the entire 790 m borehole section, and using histogram and multi-parameter intersection graph techniques, this study quantitatively analyzed the geophysical field response law of the diorite and diorite porphyrite-modified rock zone in the vertical space of 110–790 m and established the lithology identification threshold. The lithological profile of the borehole and the mineralized alteration layer were divided. The results demonstrated that a lithological identification model for diorite-altered rock series can be constructed using a combination of natural gamma, resistivity, magnetic susceptibility, and electrode potential parameters, providing critical geophysical criteria for three-dimensional targeting of concealed ore bodies. Quantitative analysis revealed that pyritization intensity in the Baoxinggou deposit exhibits no significant correlation with resistivity anomalies, whereas the development of silicified fracture zones shows a coupling relationship with resistivity reduction. A ternary anomaly combination of “low-resistivity, moderate-to-high gamma, and multi-peak high electrode potential” was established as a geophysical logging indicator for gold exploration in the Baoxinggou gold deposit. This achievement not only effectively delineates favorable horizons for hosting gold to guide deep and peripheral prospecting but also provides a scientific basis for deploying three-dimensional exploration projects beyond 2000 m depth. |
| keywords:Baoxinggou gold deposit well logging lithological response characteristics prospecting signs |
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