鲁西超深覆盖区矽卡岩型铁矿勘查技术体系研究——以齐河—禹城地区铁矿勘查为例

Study on Exploration Technology System of Skarn Type Iron Deposit Ultra deep CoverageArea in Western Shandong Province——Taking Iiron Deposit Exploration in Qihe Yucheng Area as an Example

摘要:

鲁西齐河禹城超深覆盖区矽卡岩型铁矿找矿成功案例对于深覆盖区铁矿勘查工作具有重要的借鉴意义。齐河—禹城地区属低缓地球物理异常区，铁矿位于新生界巨厚覆盖层之下，勘查难度大；目前勘查发现的铁矿体位于李屯、大张、郭店村等地，总体具有“埋藏深、厚度大、品位高、储量多”的特点。本次研究在总结区域矿产勘查经验基础上，分析区内勘查技术手段的有效性，优选了专项地质测量（综合研究）、面积性磁法测量、面积性重力测量、大比例尺综合物探剖面测量（磁法、重力、电法、地震等）、钻探和测井等技术手段进行优化组合开展勘查工作。通过研究该区铁矿勘查成果，按照面上选区、区内选段、段中选点的思路，构建了超深覆盖区矽卡岩型铁矿勘查技术体系，综合研究全程指导—信息集成异常初选—航空物探异常选区—地面物探异常选段—物探剖面异常选点—钻孔测井查证异常。在勘查过程中需持续分析研究各找矿手段的技术优势，以获得最佳找矿效果，为在类似地区矽卡岩型铁矿找矿过程中提供技术手段和勘查经验。

Abstract:

Accompanying with gradual advance of deep ore prospecting, mineral exploration in deep coverage areas will be main study object in the future. The successful case of skarn type iron ore prospecting in Qihe Yucheng ultra deep coverage area in western Shandong province has very important reference significance for iron ore exploration in relevant areas. Qihe Yucheng area belongs to low—gentle geophysical anomaly area, and iron deposits are located under Cenozoic huge thick coverage area with difficult exploration. At present, the iron ore bodies discovered in the exploration areas are located in Litun, Dazhang, Guodian village and other places, which are generally characterized by "deep burial, large thickness, high grade, large reserves". On the basis of summingg up regional mineral exploration experiences, the effectiveness of exploration technology in the area has been analyzed , and the combination of special geological survey (comprehensive study), areal magnetic survey, areal gravity survey, largescale comprehensive geophysical profile survey (magnetic method, gravity method, electrical method, seismic method, etc.), drilling, logging and other technical means have been optimized to carry out exploration work. Based on the study of iron ore exploration results in the area, according to the thought of selecting areas on the surface, selecting sections in the area, and selecting points in the section, a technical system for the exploration of skarn iron ore in the ultradeep coverage area has been set up, that is comprehensive study of full period guidance—information integration and preliminary selection of anomalies—selecting area of airborne geophysical anomalies—selecting sector of surface geophysical anomalies—selecting points of geophysical profile anomalies—borehole and logging verification anomalies. In the exploration process, it is necessary to continuously analyze and study technical advantages of each prospecting method to obtain the best prospecting effect. It also provides technical means and exploration experience in the process of prospecting for skarn type iron ores in similar areas.