基于归一化特征值的重磁数据边界识别方法及其在西藏古堆地热勘探中的应用  

Edge Detection Method of Gravity and Magnetic Data Based on Normalized Eigenvalue and Its Application of Geothermal Exploration in Gudui,Tibet

作　　者：赵强[1,2] 管彦武 卢鹏羽[1] 周帅 Zhao Qiang;Guan Yanwu;Lu Pengyu;Zhou Shuai(College of GeoExploration Science and Technology,Jilin University,Changchun 130026,China;519 Brigade of North China Geological Exploration Bureau,Baoding 071051,Hebei,China)

机构地区：[1]吉林大学地球探测科学与技术学院,长春130026 [2]华北地质勘查局五一九大队,河北保定071051

出　　处：《吉林大学学报（地球科学版）》2023年第2期578-588,共11页Journal of Jilin University：Earth Science Edition

基　　金：国家重点研发计划项目(2020YFE0201300);吉林省科技发展计划项目(20210508033RQ);中央高校基本科研业务费专项(415010300086)。

摘　　要：基于重磁数据的地质体边界识别是地球物理数据解释的重要内容。随着重磁梯度张量测量技术的不断发展,基于梯度张量数据圈定地质体构造边界位置的方法也在不断发展。本文定义一种基于梯度张量特征值的归一化边界识别滤波器,可同时进行不同深度目标体的边界位置圈定。为验证本文方法的有效性,将建立方法应用于合成的重磁数据中,相比于传统边界识别滤波器,本文滤波器具有更高的水平分辨率和精度,并且在正负叠加异常的试验中,可有效地避免虚假边界的产生。最后,将归一化特征值边界识别滤波器应用于西藏古堆地热田的地质构造解释,结果表明,基于特征值的边界圈定方法能够更准确地显示地质构造的边界位置,发现更多地质体构造细节特征。The geological sources edge detection based on gravity and magnetic data is an important content of geophysical data interpretation.With the development of gravity and magnetic gradient tensor measurement techniques,the method of delineating geological sources structural boundary location based on gradient tensor data is also developing.In this paper,a normalized edge detection filter based on gradient tensor eigenvalues is defined,which can simultaneously delineate the edges positions of sources at different depths.In order to verify the effectiveness,the proposed method is applied to the synthetic gravity and magnetic data.Compared with the traditional edge detection filter,the proposed method has higher horizontal resolution accuracy,and can effectively avoid the generation of false boundaries in the test of positive and negative superimposed anomalies.Finally,the normalized eigenvalue filter is applied to the geological structure interpretation of Gudui geothermal field in Tibet.The results show that the edge detection method based on eigenvalue can display the boundary position of sources more accurately,and discover more geological structure details.

关 键 词：重磁数据 边界识别 特征值 梯度张量 西藏古堆 地热 

分 类 号：P631[天文地球—地质矿产勘探]