摘要
边界识别是重力资料解释中的一项重要任务.随着重力梯度测量技术的迅速发展,重力梯度张量数据在边界识别中的应用越来越广泛.本文重点研究了随着深度的增加,边界识别能力下降,正负异常中出现假边缘的问题.另外,有些边缘检测方法对走向不同的地质体识别能力有所差异.本文对基于重力梯度张量的水平方向Theta法进行改进,通过选择合适的阈值来减少虚假异常,提出了一种改进的重力梯度全张量数据的边界识别方法(IED).通过模型试验的对比,证明该方法不再受地质构造走向的影响,对不同深度的地质体边缘检测清晰、连续,且正负异常之间无虚假边界.最后,将该方法应用于加拿大圣乔治湾的重力梯度张量资料,其结果显示了更多的地质细节.
Edge detection is an essential task in interpretations of gravity and magnetic data.With the rapid development of gravity gradient measurement technology,gravity gradient tensor data has been increasingly used in edge detection.This article focuses on the problem that with the depth increase,the ability to recognize the edge decreases and false edges occur in positive and negative anomalies when using some edge detection methods.In addition,some methods have different recognition abilities for geological bodies with different strikes.Here we propose a new edge detection method which is based on the improved horizontal Theta method of gravity gradient tensors and choosing an appropriate threshold to reduce false anomalies.Comparison of model tests demonstrates that the proposed method is no longer affected by the strike of geological structures.The edges of geological bodies at different depths detected are clear and continuous,and there are no false boundaries between positive and negative anomalies.Finally,this method is applied to the real gravity gradient tensor data in St.Georges Bay,Canada,revealing more geological details.
作者
杜威
吴贺宇
陈祥忠
刘俊成
张阳阳
惠梦琳
DU Wei;WU HeYu;CHEN XiangZhong;LIU JunCheng;ZHANG YangYang;HUI MengLin(State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China;College of Geo-exploration Science and Technology,Jilin University,Changchun 130026,China;Beijing Orangelamp Geophysical Exploration Company Limited,Beijing 102200,China;Geological Exploration Technology Institute of Anhui Province,Hefei 230031,China)
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2021年第9期3358-3367,共10页
Chinese Journal of Geophysics
基金
国家青年科学基金项目(41904129)资助.
