高精度磁测找矿效果:以青海尕林格矿区为例  

Application of High-Precision Magnetic Survey to Prospecting: A Case Study in the Galinge Deposit of Qinghai Province

作　　者：朱朝吉 周肇武 刘天佑[2] 张恒磊[2] 

机构地区：[1]青海省有色矿产勘查院,青海西宁810007 [2]中国地质大学(武汉),湖北武汉430074

出　　处：《地质与勘探》2011年第2期277-283,共7页Geology and Exploration

基　　金：青海省科技厅资助科研项目(2009-G-118-02);全国危机矿山接替资源找矿项目(200799084)

摘　　要：青海尕林格铁矿区由于地表有近200m覆盖层,磁法勘探是直接而有效的方法。但是由于覆盖层厚,矿体埋深大,造成磁异常形态简单,难以进一步分析深部是否存在盲矿体。笔者在前人工作的基础上,运用小波多尺度方法分析了该区的平面磁异常,发现小波5阶细节(场源似深度600m)为矿异常特征,推断了该区深度500m以下可能存在磁铁矿体。在此基础上利用二度半任意截面水平柱体人机交互反演进一步解释证实了深部有隐伏铁矿体存在。小波分析与人机交互反演方法等方法技术为扩大尕林格矿区远景储量提供了新思路。Although magnetic survey is a direct and efficient method for ore search,its effect is limited in the Galinge iron deposit of Qinghai Province.The reason is that thick cover and big depth of buried ore bodies characterize this deposit,thus the magnetic anomalies are of simple form that makes detection of deep concealed ore bodies difficult.Based on previous work,we used the wavelet multiple-scale method to analyze magnetic anomalies on the plane of this area.We discovered that five-order wavelet details are ore anomalies,and inferred that there may be magnetite bodies 500 meters below the surface.Meanwhile human-computer interactive inversion confirmed the existence of concealed ore bodies.This case shows that wavelet analysis and human-computer interactive inversion methods provide a new approach to enlarge prospective reserves of the Galinge iron deposit.

关 键 词：小波多尺度分解 二度半人机交互反演 磁异常 青海 尕林格 

分 类 号：P318.6[天文地球—固体地球物理学]