延拓转换滤波算法在航磁垂直梯度转换总场的特征分析研究  

Research on the characteristics of total-field data converted from aeromagnetic vertical gradient data based on a continuation conversion filtering algorithm

作　　者：郭华 徐曦[1,3] 韩松 郑强 刘浩军 Guo Hua;Xu Xi;Han Song;Zheng Qiang;Liu Haojun(China Aero Geophysical Survey and Remote Sensing Center for Natural Resources,Beijing 100083,China;Geo-exploration Science and Technology,Jilin University,Changchun 130026,China;School of Earth Sciences,Zhejiang University,Hangzhou 310058,China;School of Geophysics and Information Technology,China University of Geosciences(Beijing),Beijing 100083,China)

机构地区：[1]中国自然资源航空物探遥感中心,北京100083 [2]吉林大学地球探测科学与技术学院,长春130026 [3]浙江大学地球科学学院,杭州310058 [4]中国地质大学(北京)地球物理与信息技术学院,北京100083

出　　处：《Applied Geophysics》2024年第1期157-168,205,206,共14页应用地球物理（英文版）

基　　金：supported by National Key Research and Development Program (2017YFC0602000);China Postdoctoral Science Foundation (2019M652062)。

摘　　要：实测梯度场相比于总场来说包含的低频信息较少,也就是说实测航磁梯度数据转换得到的总场数据和实测总场数据相比,损失了部分低频信息,为此本文提出了一种延拓转换滤波算法,目的是将实测总场数据的低频信息滤除掉一部分,使得其与航磁梯度数据转换得到的总场数据更好地对比,以讨论在不方便架设日变站区域单独开展航磁梯度测量的可行性。本文设计了简单模型、有背景场以及加入随机噪声的复杂模型进行转换效果分析,模型分析表明该算法的应用效果是和向上延拓高度的选择有很大关系的,背景场的磁化强度的大小也影响着延拓高度的选择,在背景场的磁化强度较小时,延拓高度选择背景场所在埋藏深度即可;较大时,则延拓高度越高越能达到理想的效果。将模型分析结论应用于实测数据的分析,通过延拓转换滤波算法获得的总场数据与航磁垂直梯度转换获得的总场数据对比效果较好。Compared with aeromagnetic total-field data,aeromagnetic vertical gradient field data contain less low-frequency information.In this paper,a continuation conversion filtering algorithm is proposed to filter out part of the low-frequency information of the aeromagnetic total-field data so that these data can be better compared with the total-field data obtained from aeromagnetic gradient data conversion.We discuss the feasibility of single aeromagnetic vertical gradient measurement in areas where it is inconvenient to erect base stations.We design a simple model and a complex model with a background field and random noise to analyze the conversion effect.The model analysis shows that the effect of applying the algorithm depends heavily on the selection of upward continuation height.The magnetization intensity of the background field also affects the selection of continuation height.When the magnetization intensity of the background field is weak,the continuation height chosen is the same as the buried depth of the background field.If the magnetization intensity of the background field is strong,then the higher the continuation height,the better the effect will be.The conclusion of the model analysis is applied to the analysis of the measured aeromagnetic data.In addition,we can conclude that the effect on total-field data of conversion by the continuation conversion filtering algorithm is better than that of conversion from the aeromagnetic vertical gradient data.

关 键 词：航磁总场 梯度 转换 延拓转换滤波 

分 类 号：P631[天文地球—地质矿产勘探]