不同产状磁性体的磁异常特征

Magnetic Anomaly Characteristics of Magnetic Body with Different Occurrences

目前井中磁测解释大都采用水平矢量图指向确定矿体的方法,但由于磁场水平分量的定向问题,致使仅使用水平分量矢量对磁性体解释常会出现错误结果。通过描述水平产状与倾斜产状磁性体的磁场特征,对磁性体表面不同位置磁异常垂直分量及水平分量差异进行了说明,通过三个实例对反映在磁性体上、下位置的垂直分量与水平分量磁异常的空间分布特征进行了具体描述,并利用井中磁测曲线有效地解决了井底及井旁磁性体的赋存情况。多年来的工作实践证明,使用磁异常场垂直分量及水平分量特征,能准确的判定磁性矿体的主体方向及产状,该解释方法的推广有利于寻找深部磁性矿体。

The borehole magnetic interpretation at present uses mostly vector graphic directivity orebody determination. But because of magnetic field horizontal component sensibility of orientation, may cause quite often erratic results of magnetic body interpretation when use only horizontal components. Through characterizations of magnetic field characteristics of horizontal and sloping occurrences magnetic bodies, explained magnetic body surface different position magnetic anomaly vertical and horizontal components differences. Three examples are used to describe vertical and horizontal component anomalies spatial distribution reflected on magnetic body upper and lower positions, to use borehole magnetic traces can effectively find out borehole bottom and side-wall magnetic body hosting conditions. From practices in many years have demonstrated that, to use magnetic anomaly vm^tical and horizontal component characteristics, can determine magnetic orebody principle orientation and occurrence correctly, popularization of the interpretation method is favorable to deep magnetic orebody seeking.