自然电场法和AMT法在同德石墨矿勘查中的应用  

Application of natural electric field method and AMT method in Tongde graphite ore exploration

作　　者：文真蓁 陈超 郑毅 刘治成 吴得强[1,2] 孔德才 龙波 WEN Zhenzhen;CHEN Chao;ZHENG Yi;LIU Zhicheng;WU Deqiang;KONG Decai;LONG Bo(106 Geological Team of Sichuan Geological and Mineral Exploration and Development Bureau,Chengdu 611130,China;Sichuan Research Institute of Strategic Mineral Resources Exploration and Utilization,Chengdu 611130,China;Sichuan Institute of Land Science and Technology,Chengdu 610045,China)

机构地区：[1]四川省地质矿产勘查开发局一〇六地质队,成都611130 [2]四川省战略矿产资源勘查利用研究院,成都611130 [3]四川省国土科学技术研究院,成都610045

出　　处：《世界地质》2022年第3期641-653,共13页World Geology

基　　金：四川省政府性投资地质勘查项目(DZ202104);四川省自然资源科研项目(kj-2021-10)联合资助。

摘　　要：为研究自然电位法、音频大地电磁测深(AMT)在石墨矿勘查中的异常响应,选取四川省攀枝花市仁和区同德石墨矿床作为研究对象,利用石墨特有的低电阻率等特征并结合区内有利地段开展物性测量、自然电位梯度测量、音频大地电磁测深以及深部钻探工程等对其进行研究。自然电位梯度测量圈定平面异常,在此异常范围内择优布设音频大地电磁测深剖面。研究发现石墨矿上方观测到的自然电位梯度呈正负伴生的特征,自然电位梯度曲线的形态能很好地区分出多条矿体,AMT结果反映出石墨矿(化)体主要呈低阻特征,推断的石墨矿(化)体深部的延深形态与实际地表工程和深部钻探工程控制的基本一致。上述两种方法结合使用产生的矿化异常与地表槽探及深部钻探工程施工结果套合良好,异常反映的地质信息较为准确,对同德石墨矿的找矿勘查具有较大的意义。In order to study the abnormal response of natural electric field method and controlled-source audiomagnetotelluric method(AMT)in graphite ore exploration,Tongde graphite ore is selected as the research object,and physical property measurement,spontaneous potential gradient measurement,audio magnetotelluric sounding and deep drilling engineering are used by using the unique low resistivity and other characteristics of graphite combined with favorable sections.The spontaneous potential gradient measurement circles the surface anomalies,and audio magnetotelluric sounding profile is preferentially arranged within this anomaly range.It is found that the spontaneous potential gradient observed above the graphite ore is associated with positive and negative characteristics.The shape of the spontaneous potential gradient curve can well distinguish ore bodies.The AMT results reflect that the graphite ore(chemical)body is mainly characterized by low resistance.The inferred deep extension shape of the graphite ore body is basically consistent with the actual surface engineering and deep drilling engineering control.The mineralization anomaly produced by the combination of the above two methods fits well with the construction results of surface trenching and deep drilling engineering,and the geological anomaly information reflected by the anomaly is relatively accurate,which is of great significance to the prospecting and exploration of Tongde graphite mine.

关 键 词：同德 石墨矿 自然电位法 音频大地电磁测深 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置] P619.25[自动化与计算机技术—控制科学与工程]