优化小子域滤波方法研究及其应用  

An optimized small sub-domain filtering method

作　　者：马国庆[1] 杜晓娟[1] 李丽丽[1] 

机构地区：[1]吉林大学地球探测科学与技术学院,吉林长春130021

出　　处：《石油地球物理勘探》2013年第4期658-662,676+506,共5页Oil Geophysical Prospecting

基　　金：深部探测技术与实验研究专项SinoProbe-09-01(201011080);中国地质调查局地质矿产调查评价专项项目(GZH003-07-03)联合资助

摘　　要：低通滤波是重磁数据处理中必不可少的处理手段。利用小子域滤波法进行低通滤波处理时能够很好地保留异常之间的界限,因此此法在实际数据处理中得到广泛应用。但是,小子域滤波法存在子域剖分方式不合理导致异常曲线扭曲的缺陷。本文针对现有小子域滤波法的子域剖分方式和判别准则进行相应改进,使其更加合理,并通过理论模型试算,证明了优化小子域滤波方法的有效性,最后将该方法应用于四川实测航磁异常数据的处理中,结果表明能更好地保留异常之间的界限特征,滤波输出结果合理、稳定。Low-pass filtering is an indispensable tool for processing gravity and magnetic anomaly.The low-pass filtering with the small sub-domain filtering can well keep anomaly boundaries.Therefore this method is widely used in the processing of actual data.However,the method could make anomaly feature distorted due to unreasonable sub-domain division.This paper proposes an improved sub-domain division and identification criterion.We first test the optimized small sub-domain filtering method on synthetic data,and the test results prove that the method is effective.At last,we apply the optimized method to real aeromagnetic data acquired in Sichuan.The results show that the method can well keep the anomaly boundary feature,and that the filtering is reasonable and stable.

关 键 词：重磁数据 低通滤波 小子域滤波 区域场 界限 

分 类 号：P631[天文地球—地质矿产勘探]