均值归一总水平导数边界识别方法  

Edge Detection by Equalized and Normalized Amplitude of Total Horizontal Derivatives

作　　者：王赛昕[1] 刘林静[1] 

机构地区：[1]中国地质大学地球物理与空间信息学院,湖北武汉430074

出　　处：《工程地球物理学报》2011年第6期699-704,共6页Chinese Journal of Engineering Geophysics

基　　金：全国危机矿山接替资源找矿项目(编号:200799084);国土资源部公益性行业科研专项(编号:200911017-03);中国地质大学(武汉)第八届"挑战杯"大学生课外学术作品竞赛项目资助

摘　　要：分析了近年利用重磁异常进行边界识别的方法,指出Tilt-angle法、Theta Map法等一类方法是通过计算重磁异常的高阶导数及其比值来增强地质边界信息,由于高通滤波对数据误差放大,在一个计算点上两种导数的比值可能会有比较大的波动,导致实际资料计算结果无法利用。为了避免在一个点计算比值造成波动的影响,笔者采用总水平导数均值归一的方法,避免了实际资料处理结果的振荡;同时,对不同强度的总水平梯度异常采用不同的均值进行归一,突出了弱地质边界信息。将该方法应用于大杉树钒钛磁铁矿远景区对辉长岩的边界识别,得到较好的地质效果。In this paper,we analyze some methods for edge detection based on gravity and magnetic anomaly in recent years.We pointed out that the methods such as Tilt-angle and Theta Map enrich the source edge by calculating the high order derivatives of gravity or magnetic anomaly and the ratio of them.Because the high-pass filter increases data error,the ratio of the two derivatives may fluctuate strongly on a dot and the actual data cannot be used.To avoid the effect of the ratio fluctuation on a dot,we adopt the method named equalized and normalized amplitude of total horizontal derivatives,which avoid the fluctuation of the calculated result of the actual data.Moreover,it uses different average to normalize total horizontal derivatives towards different intensity.As a result,it enhances the information of faint source edge.Applying this method to detecting the gabbro edge in Dashanshu vanadium and titanium magnetite long-range region,a good geological effect is achieved.

关 键 词：重磁异常 边界识别 归一化 总水平导数 辉长岩 

分 类 号：P631[天文地球—地质矿产勘探]