山东齐河—禹城地区重磁场特征及找矿预测

Magnetic field characteristics and ore prediction in Qihe-Yucheng area of Shandong Province

齐河—禹城地区已钻探见富铁矿深度748~1542 m,第四系覆盖厚度超过500 m,富铁矿体地球物理场信息弱,找矿难度大。为了进一步缩小找矿靶区,为钻孔部署提供依据,通过研究矿致异常的航空和地面重磁异常特征,利用化极、垂向导数、总梯度模等方法,提取富铁矿直接找矿信息,建立了本区地球物理找矿标志,确定了7处重点勘查区。本项研究成果为齐河—禹城地区后续找矿工作部署提供了重要依据。

Rich iron ore has been drilled in the depth from 748 m to 1542 m in Qihe-Yucheng area.As the Quaternary sediments cover more than 500 m in thickness,the geophysical field information of the rich iron ore is weak and hence the prospecting is difficult.By studying airborne and ground gravity and magnetic anomaly characteristics of mineralization anomaly and using methods such as reduction to the pole,vertical derivative and total gradient module,the authors further reduced the prospecting target and provided a basis for the drilling work.The authors extracted the direct prospecting information of rich iron ore,established the geophysical prospecting signs of this area and delineated 7 key exploration areas.The results of this research provide an important basis for the subsequent deployment of prospecting work in Qihe-Yucheng area.