自然电场法和AMT法在石墨矿勘查中的应用

An Application of Natural Electric Field Method and AMT Method in Graphite Exploration

勘查区位于攀枝花市米易县,为沉积变质型典型石墨矿。为了大致查明勘探线深部的异常分布、规模、形态、强度等特征,开展了自电电位梯度测量和音频大地电磁测深工作。自电电位梯度测量可以圈定平面自电电位梯度异常,而后在此异常范围内布设音频大地电磁测深剖面。由于勘查区内的石墨矿比围岩电阻率低,两种方法结合,勘探效果良好。经过钻孔验证,自电电位梯度测量和音频大地电磁测深法的勘查成果准确可靠,可在类似石墨矿勘查中进一步推广应用。

This exploration area is located in Miyi County of Panzhihua City.It is a sedimentary metamorphic type of graphite ore.In order to roughly identify the anomalous distribution,scale,shape and strength of the deep part of the exploration line,the author carried out self-electric potential gradient measurement and audio magnetotelluric sounding.The self-electric potential gradient measurement can delineate the plane self-electrical potential gradient anomaly.It arranges the audio magnetotelluric sounding profile in this abnormal range.Since the graphite ore in this exploration area has a lower resistivity than the surrounding rock,the combination of the two methods has a good exploration effect.After the drilling data verification,the self-electric potential gradient measurement and the audio magnetotelluric sounding method are accurate and reliable.It can be further promoted and applied in similar graphite ore exploration.