自相关滤波法提取重磁场中弱异常  

Extracting weak anomaly in gravity and magnetic field with self-correlation filtering method

作　　者：韩兆红[1,2] 吴燕冈[1] 张成海[1] 孙鹏飞[1] 

机构地区：[1]吉林大学地球探测科学与技术学院,长春130026 [2]吉林工程技术师范学院应用理学院,长春130052

出　　处：《世界地质》2010年第1期124-129,共6页World Geology

基　　金：国家高技术研究发展计划(863计划)(2006AA06Z107);"十一五"国家科技支撑计划项目(2006BAB01A02)联合资助

摘　　要：在每条测线内自动寻找剩余局部异常最大点处的观测值,将其作为参考模型,并沿整条测线进行滑动自相关处理,对重磁异常处理中的自相关滤波因子进行了改造。理论模型研究表明,改造后的滤波结果中零等值线能较好的划分异常边界,对横向叠加异常的分辨能力很强,能够提取常规方法很难识别的弱异常。对滤波窗口的研究表明,自相关半径选择3~6个网格节点距为佳。利用改造后的自相关滤波因子进行实际资料处理,发现了新的找矿远景区。The authors reform the conventional self-correlation filtering factor in the process of gravity and magnetic anomalies in search for the observed value in remaining local anomaly largest point automatically in each measuring line and taking it as the reference model,then making the sliding self-correlation treatment along the whole measuring lines.The study of theoretical model shows that the zero-contour of reformed filtering results can define the abnormal border preferably is strong in resolving power of horizontal anomaly superimposition,and can extract weak anomaly which is indiscernible in normal method.The study of filtering window shows that it is the best for self-correlation radius in 3～6 grid node distances.The authors find new prospecting area by treating the actual data using reformed self-correlation filtering factor.

关 键 词：自相关滤波 弱异常 随机干扰 

分 类 号：P631[天文地球—地质矿产勘探]