基于Tanimoto相似的重力异常相关成像方法研究  

Research on gravity anomaly correlation imaging method based on Tanimoto similarity

作　　者：王颖舜 李军[1] 简兴祥 WANG Ying-Shun;LI Jun;JIAN Xing-Xiang(College of Geophysics,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]成都理工大学地球物理学院

出　　处：《物探与化探》2019年第6期1350-1357,共8页Geophysical and Geochemical Exploration

基　　金：国家重点基础研究发展计划“深部矿产地球物理三维建模与预测”项目(2017YFC0601504)

摘　　要：相关成像方法主要用于求解异常源空间赋存位置,但其成像结果不理想,在深度方向上存在发散现象。由于正演对成像的验证性作用,笔者设计了简单模型、多个异常源叠加模型,对传统基于Pearson相似算法、余弦相似算法的相关成像方法进行研究,指出传统相关成像中利用Pearson相似计算重力异常时出现假异常的现象,同时提出了基于Tanimoto相似的相关成像,并针对该算法改进了核函数,对多源异常采取窗口化的异常分离方式。研究表明笔者提出的方法具有异常源纵、横向分辨率较传统相关成像方法有所提高,异常源形态勾勒准确的特点,为重力资料的解释提供了有力信息。The correlation imaging method is mainly used to solve the location of anomalous source space,but its imaging results are not ideal,and there is divergence in the longitudinal direction.Due to the confirmatory effect of forward modeling on imaging,this pa?per designs a simple model and multiple anomaly source overlay models.The traditional imaging methods based on Pearson similarity algorithm and cosine similarity algorithm are studied.It is pointed out that Pearson similarity is used to calculate gravity anomalies in traditional correlation imaging.The phenomenon of false anomalies occurs,the related imaging based on Tanimoto similarity is pro?posed,and the kernel function is improved for the algorithm.The research shows that the method proposed in this paper has an im?proved vertical and horizontal resolution of the source compared with the traditional correlation imaging method,and the abnormal source form outlines the accurate features,which provides powerful information for the interpretation of gravity data.

关 键 词：重力异常 Tanimoto相似 核函数 虚假异常源 窗口化 

分 类 号：P631[天文地球—地质矿产勘探]