等值反磁通瞬变电磁法在铅锌矿勘探中的适用性研究

The applicability research of opposing coils transient electromagnetics method in Pb-Zn ore exploration

等值反磁通作为一种浅层瞬变电磁法,具有抗干扰能力强、分辨率高的特点,多用于工程物探相关领域.为研究该方法在矿山找探矿中的适用性,选择青海某铅锌矿区,在钻孔控制的勘探线上开展了方法有效性试验.同时针对矿区首采区西侧地层、矿床及构造分布不明,找矿思路不够清晰等问题,结合已知矿体的分布特征,开展了面积性测量工作,初步查明了地层、构造的分布情况,圈定了矿致异常,提出了矿区找探矿的新思路.经过后期钻孔验证,证实了物探成果与实际地质基本吻合.研究结果表明该方法在矿区浅部矿产勘探中具有良好的适用性,为矿区下一步找探矿及矿权维护提供了支撑依据,具有重要的实际应用价值.

As a shallow transient electromagnetic method,opposing coils transient electromagnetics method has the characteristics of strong anti-interference ability and high resolution,which is mainly used in engineering geophysical exploration related fields.In order to study the applicability of this method in prospecting in mining area,choose a Pb-Zn mine area in Qinghai Province,a method validity test was carried out on the borehole con-trolled exploration line.At the same time,considering the unknown distribution of stratum,ore deposit and struc-ture in the west of the first mining area,prospecting ideas is not clear,combined with the distribution characteristics of known ore bodies of the mining area,the areal survey was carried out.Preliminarily ascertained the distri-bution of strata and structures,the ore-induced anomalies were delineated,a new idea of prospecting in mining area is put forward.After later drilling verification,it’s confirmed that the results of geophysical exploration are basically consistent with the actual geology.The results of this study show that the method has good applicability in shallow mineral exploration in mining area,which provides a supporting basis for prospecting and mining right maintenance in the mining area,and has important practical application value.