根据磁异常确定磁性体上顶埋深的几种反演方法——以尕林格矿区磁测资料解释为例

根据磁异常确定磁性体上顶埋深是磁法勘探中寻找磁性物体及磁性矿床的重要问题之一。笔者总结了4种用磁异常确定磁性体上顶埋深的反演方法,它们是切线法、欧拉法、功率谱法、磁化强度成像法。本文首先将这4种方法用于板状体模型的反演,反演深度与板状体实际深度一致。然后,将它们应用于青海省尕林格矿区地面高精度磁测资料的反演解释,以勘查被广厚的第四纪砂砾沉积覆盖的磁铁矿,取得较好找矿效果。

On Inversion Methods of Estimating Top Buried Depth of Magnetic Body Based on Magnetic Anomalies: A Case Study of Magnetic DataInterpretation in Galinge Mining Area

In magneticpros pecting,based on magnetic anomalies estimating top buried depth of magnetic body is one of the important issues to prospect magnetic objects and magnetic deposits.The authors summarized four inversion methods including Euler method,tangent method,power spectrum method and magnetization imaging method to estimate the top buried depth.Firstly,these methods were used to inverse top buried depth of synthetic dikes,which revealed that the inversion depth accorded with the true depth of dikes.Moreover,it showed prospecting effects well that they were applied to inversing and to interpreting the high-precision ground magnetic data to explore magnetite,which is covered by wide and thick Quaternary gravels deposited in Galinge mining area of Qinghai province.