磁异常三维反演在磁铁矿勘查中的应用  

Application of three-dimensional magnetic anomaly inversion in magnetite exploration

作　　者：赵柏儒 李厚朴[3] 张恒磊[1,2] ZHAO Bai-Ru;LI Hou-Pu;ZHANG Heng-Lei(School of Geophysics and Geomatics,China University of Geosciences(Wuhan),Wuhan 430074,China;Key Laboratory of Geological Survey and Evaluation of Ministry of Education,China University of Geosciences(Wuhan),Wuhan 430074,China;School of Electrical Engineering,Naval University of Engineering,Wuhan 430033,China)

机构地区：[1]中国地质大学(武汉)地球物理与空间信息学院,湖北武汉430074 [2]中国地质大学(武汉)地质探测与评估教育部重点实验室,湖北武汉430074 [3]海军工程大学电气工程学院,湖北武汉430033

出　　处：《物探与化探》2024年第6期1626-1632,共7页Geophysical and Geochemical Exploration

基　　金：国家优秀青年科学基金项目“海洋大地测量”(42122025);国家重点研发计划项目“磁探测系统及关键技术研究”(2022YFC3104000);地质探测与评估教育部重点实验室主任基金;中央高校基本科研业务费(GLAB2022ZR08)。

摘　　要：由于青海尕林格铁矿区上覆有超过150 m厚的沉积覆盖层,矿体埋深大,使得磁异常形态平缓,难以刻画矿体的空间分布特征。因此,本文采用磁异常三维反演方法获得研究区地下三维磁化强度分布特征。结合该区围岩无磁性的先验信息,三维磁化强度模型不仅能较清晰地显示矿体的空间分布特征,而且反映了现有500 m以浅的钻孔下方存在强磁性体的分布,推断区内500 m深度以下存在隐伏矿体。研究结果表明,磁异常三维反演可以有效地提升目标体的识别能力,能够较清晰地显示磁性矿体的水平位置、深度及规模等信息,可以为钻探设计、储量评估等提供有力依据,值得在固体矿产勘探详查中推广应用。The Galinge iron deposit in Qinghai is overlain by deposits measuring greater than 150 m in thickness.The great burial depths of ore bodies lead to gentle magnetic anomaly morphology,making it difficult to characterize the spatial distribution of ore bodies.Therefore,this study employed three-dimensional magnetic anomaly inversion to determine the three-dimensional distribution characteristics of subsurface magnetic intensity in the study area.Given the prior information of non-magnetic surrounding rocks,the three-dimensional magnetic intensity model clearly presented the spatial distribution of the ore bodies and reflected the presence of intense magnetic bodies at depths of less than 500 m in existing boreholes.Accordingly,it can be inferred that there exist concealed ore bodies at depths exceeding 500 m in the study area.The results of this study suggest that three-dimensional magnetic anomaly inversion can effectively improve target identification,providing clear information on the horizontal positions,depths,and scales of magnetic ore bodies.The proposed inversion method can offer strong support for drilling design and reserve estimation,warranting promotion in detailed exploration of solid minerals.

关 键 词：磁法勘探 三维反演 磁铁矿勘查 尕林格矿区 

分 类 号：P631[天文地球—地质矿产勘探]