深埋铁矿磁测数据三维反演分析与找矿靶区预测  

Three-dimensional inversion analysis of magnetic data from deep buried iron ore and prediction of prospecting target area

作　　者：朱裕振 强建科[2] 王林飞 张文艳 戴世坤[2] ZHU Yu-Zhen;QIANG Jian-Ke;WANG Lin-Fei;ZHANG Wen-Yan;DAI Shi-Kun(Shandong Coalfield Geological Planning and Investigation Institute,Jinan 250104,China;School of Earth Sciences and Information Physics,Cen?tral South University,Changsha 410083,China;China Aerospace Geophysical and Remote Sensing Center,Beijing 100083,China)

机构地区：[1]山东省煤田地质规划勘察研究院,山东济南250104 [2]中南大学地球科学与信息物理学院,湖南长沙410083 [3]中国自然资源航空物探遥感中心,北京100083

出　　处：《物探与化探》2019年第6期1182-1190,共9页Geophysical and Geochemical Exploration

基　　金：国家重点基础研究发展计划项目(2017YFC0602201、2017YFC0602204);山东省煤田地质局科研专项奖励基金“基于多元地球物理探测技术的深部富铁矿找矿预测研究”项目(鲁煤地科字(2017)1号)

摘　　要：寻找深埋铁矿床是一件非常复杂的探索性研究,目前面临的困难是铁磁异常较小,且淹没于大片含磁性的侵入浆岩体中,采用以往定性解释磁异常的方法可能会造成较大偏差,使勘探风险陡增。随着计算机技术的快速发展,大规模三维反演已经成为现实,笔者采用磁法三维反演软件对山东齐河—禹城地区面积性磁测数据进行了自动反演,获得了该地区地下空间磁化率分布,结合已有钻孔地质资料,分析了有铁矿存在时磁化率等值线在空间上有高值圈闭的特点,且圈闭中心比实际矿体位置偏浅约500m左右。比照这个特征,从勘探区反演的三维磁化率数据中搜索南北和东西方向具有高磁异常圈闭的区域,发现了两个较可靠的找矿靶区。The search for deep buried iron deposits is a very complicated exploratory study.The current difficulty is that the ferromag?netic anomalies are small and submerged in large magnetic intrusive rock masses.It may cause large deviations and increase the risk of exploration.With the rapid development of computer technology,large?scale three?dimensional inversion has become a reality.This pa?per uses GMES?3DI commercialization software to automatically invert the area magnetic data of Qihe?Yucheng area in Shandong Prov?ince,and obtains the magnetic susceptibility of underground space in this area.Based on the distribution and combined with the exist?ing geological data of boreholes,the authors revealed the characteristics of the magnetic susceptibility contours with high value traps in the presence of iron ore,with the trap center being about 500 m shallower than the actual orebody position.Based on this feature,the authors used the three?dimensional magnetic susceptibility data retrieved from the exploration area to search for areas with high magnetic anomaly traps in the north?south and east?west directions and,as a result,delineated two relatively reliable prospecting targets.

关 键 词：磁法勘探 深埋铁矿 磁测数据三维反演 找矿靶区预测 

分 类 号：P618[天文地球—矿床学]