高精度磁测与激电测深在航磁异常查证中的应用  

The application of high precision magnetic survey and IP sounding to the aeromagnetic anomaly verification

作　　者：王少帅[1] 邓国武[1] 汪冰[1] 牛海威 马密堂[1] WANG Shao-Shuai DENG Guo-Wu WANG Bing NIU Hai-Wei MA Mi-Tang(Airborne Survey and Remote Sensing Center of Nuclear Industry, Shijiazhuang 050002, Chin)

机构地区：[1]核工业航测遥感中心,河北石家庄050002

出　　处：《物探与化探》2016年第5期916-922,共7页Geophysical and Geochemical Exploration

基　　金：内蒙古自治区地勘基金项目(10-3-KC03)

摘　　要：宝音图地区的地层与岩体具有明显的磁性和电性差异,为了解该区航磁异常的地质与地球物理特征,通过1∶1万地面高精度磁法测量,圈定地面磁异常及复核航磁异常的位置,对磁测数据进行化极、延拓等处理,获得磁异常的形态、规模、埋深等特征;选取矿化好的磁异常区段进行激电测深工作,反演矿(化)体在深部的规模及延伸状况;而后通过钻探工程揭露,验证激电反演结果。最后结合地质、激电测深、钻探验证等资料,用Oasis Montaj软件对磁测剖面数据进行2.75D人机联合约束反演,拟合出矿体的形态特征,得出异常体的相对深度、宽度和厚度,为地质找矿提供有利的地球物理依据。The strata and rock masses in Baoyintu area show obvious magnetic and electrical differences. In order to understand geological and geophysical characteristics of the aeromagnetic anomaly,the authors delineated the areas of ground magnetic anomaly and composite aeromagnetic anomaly by 1∶ 10 000 precision ground magnetic survey. The aeromagnetic data processed with methods of reduction to the pole and upward continuation could obtain the magnetic anomaly features such as shape,size and buried depth. The IP sounding could be used to invert the size and extension of the deep orebody or mineralization in the area where there were obvious mineralization characteristics. Then drilling engineering could validate the result of the IP sounding. Finally,combined with the information of geology,IP sounding and drill verification,the authors used Oasis Montaj software to perform human-machine joint constrained inversion for 2.75 D magnetic profile data,fitted out the morphological characteristics,and drew relative depth,width and thickness of the anomaly body,thus providing reliable geophysical basis for ore prospecting.

关 键 词：高精度磁测 激电测深 航磁异常查证 反演 

分 类 号：P631[天文地球—地质矿产勘探]