Airborne-surface-borehole cooperative exploration technical system for magnetite exploration in areas with thick overburden
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摘要:
研究目的 厚覆盖区磁铁矿勘查作为深部找矿的重要内容，工作程度低、矿体引起的异常信号弱、找矿难度大，亟待探索形成一套行之有效的勘查技术体系。
研究方法 运用空-地-井多维度、多方法勘查手段，采用远景区−航空物探−地面物探及验证孔−空地井联合反演−钻探逐级逼近的多元信息工作方法，使用空-地-井地球物理勘查技术、综合地质找矿信息提取方法、岩性构造填图及靶区圈定、基于多元信息的航空重磁联合反演、三维地质-地球物理建模等关键技术。
研究结果 针对厚覆盖区找矿特点，建立了厚覆盖区磁铁矿空-地-井协同勘查技术体系，在山东齐河地区应用，提升了找矿效果，实现了富铁矿找矿突破。
结论 该技术体系发挥了空-地-井协同勘查优势，为厚覆盖区磁铁矿勘查提供了理论和技术支撑，也为厚覆盖区寻找其他类型矿床提供参考。
Abstract:Objective As an important part of deep prospecting, magnetite exploration in areas with thick overburden has some problems such as low exploration level, weak geophysical signals and huge prospecting difficulties. It is urgent to try and form an effective exploration technology system.
Methods This paper employs multi−dimensional and multi−method airborne−surface−borehole exploration means, uses multi−source information and a step−by−step approach, which is: prospecting area——airborne−geophysical methods——surface geophysical methods and verification borehole——airborne−surface−borehole joint inversion——drilling. Key technologies such as airborne−surface−borehole exploration technique, extracting technique for integrated geological prospecting information, lithologic structural mapping and prospecting target delineating technique, airborne−magnetic and gravity joint inversion based on multi−information, 3D geological−geophysical modeling approach are used.
Results In response to the characteristics of ore prospecting in areas with thick overburden, an airborne−surface−borehole cooperative exploration technical system for magnetite in such areas has been established. Magnetite has been found in several new boreholes following this technical system. The application of this technology system in Shandong Qihe demonstration area with thick overburden has improved the prospecting effect and achieved a breakthrough in high-grade magnetite ore prospecting.
Conclusions This technical system, taking advantage of airborne−surface−borehole cooperative exploration, provides theoretical and technical support for magnetite prospecting in areas with thick overburden, and also provides reference for prospecting other types of deposits in similar areas.
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