摘要:
井中三分量磁测能较好地判断异常体的性质,进而判断磁性体的方位和空间位置,通常联合地面磁测可以更准确地判断地下矿体赋存情况,确定矿体产状、延伸方向及延深,指导布钻,提高见矿率.笔者主要分析了球体、薄板状体的磁场分布特征,总结磁场分布特征与磁性体的方位、磁化方向、倾斜方向等之间的相互对应关系,研究判断矿体方位、确定矿体空间位置的方法.井中三分量磁测是配合钻探寻找地下深部磁性矿体、了解其赋存情况的有效手段.将该方法应用于海南石碌铁矿某工区ZK1102井,提高了确定地下矿体空间位置的精确度,为继续钻进、终止布孔工作以及磁性矿体的储量评估提供参考.
Abstract:
The three-component magnetic survey in drill hole can improve the exploration accuracy of mineral body so as to direct the exploration drilling with the surface magnetic survey after detecting the anomalies near the drill hole better.The three-component magnetic survey in drill hole is also used in search for the blind orebody near or under the drill hole and in judging the shape,direction and depth of the mineral body.This paper mainly analyzes the magnetic field distribution characteristics of sphere and the laminated body,and summarizes the corresponding relationship between the characteristics of magnetic field distribution and orientations,such as location,direction of magnetization,and sloping direction.Also,the method of judging orebody direction is studied,and the spatial location of the orebody is determined.The three-component magnetic survey in drill hole is an effective method in search for the magnetic mineral body in the depth and detecting its occurrence situation.This method was applied to the ZK1102 drill hole magnetic data of an iron ore mine in Hainan,which improved the accuracy of determining the spatial location of an underground orebody.The results obtained by the authors provide a reference for drilling or reserves evaluation of magnetic orebody.
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