利用多源地球物理图像融合方法识别物性异常——以航空电磁和航磁数据为例  

Multi-source geophysical image fusion method to identify physical anomaly:A case study of airborne electromagnetic and magnetic data

作　　者：吕鹏飞 薛国强[1,2,3] 武欣 LÜPengFei;XUE GuoQiang;WU Xin(Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing100029,China;Institutions of Earth Science,Chinese Academy of Sciences,Beijing100029,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing100049,China)

机构地区：[1]中国科学院矿产资源研究重点实验室,中国科学院地质与地球物理研究所,北京100029 [2]中国科学院地球科学研究院,北京100029 [3]中国科学院大学地球与行星科学学院,北京100049

出　　处：《地球物理学报》2023年第6期2658-2669,共12页Chinese Journal of Geophysics

基　　金：国家自然科学基金项目(42010306,42074121,92262303);中国科学院科研仪器设备研制项目(YJKYYQ20190004)共同资助。

摘　　要：对于同一地质模型,将不同地球物理数据分别进行反演,通常得到多个不同的反演结果,研究多源地球物理数据综合解释,有助于实现复杂地形环境下目标体的精确识别和定位.本文采用一种基于非下采样轮廓波变换(Non-Subsampled Contourlet Transform,简称NSCT)的多源地球物理信息融合方法,以美国阿拉斯加库克湾西南部的Iliamna火山地区的实测数据(公开数据)为例,通过对多源地球物理图像数据进行综合分析,实现了磁化率和电阻率模型的融合.首先,利用NSCT将不同地层的多源图像分解为低频子带图像和高频子带图像;然后,设计了基于加权平均和新度量参数(New Metric Parameter,简称NMP)的融合规则,并分别对低频子带图像和高频子带图像进行融合;最后利用NSCT反变换得到包含磁化率和电阻率信息的融合图像.将融合结果与先验资料进行对比,结果显示两者具有较高的一致性,表明这一方法有效可靠,为目标体精确识别和快速定位提供了一种新的解决思路.For one geological model,multiple inversion results are usually obtained by inverted different geophysical data.Comprehensive interpretation of multi-source geophysical data is helpful to achieve accurate identification and location of the target in complex terrain environment.In order to realize the fusion of multi-source data,a method based on Non-Subsampled Contourlet Transform(NSCT)is proposed in this paper.An open source data set that contains airborne electromagnetic and magnetic data from the Iliamna volcanic region in southwest Cook Bay,Alaska,USA,are used.Firstly,multi-source images of different stratum are decomposed into low-frequency and high-frequency sub-band images by NSCT.Then,the fusion rules based on a weighted average and New Metric Parameter(NMP)are designed for the low frequency and high-frequency sub-band images,respectively.Finally,NSCT inverse transformation is used to obtain the fused image containing the information of magnetic susceptibility and resistivity.The fusion results are compared with the prior information from three aspects.The results show that the two have a high consistency,which indicates that this method is effective and reliable and provides a new solution for the target′s accurate recognition and fast location.

关 键 词：图像融合 非下采样轮廓波变换 Iliamna火山数据 磁化率 电阻率 

分 类 号：P631[天文地球—地质矿产勘探]