Comprehensive approaches to 3D inversion of magnetic data affected by remanent magnetization
Comprehensive approaches to 3D inversion of magnetic data affected by remanent magnetization
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DOI：
10.1190/1.3294766
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发表时间：
2010-01-01
期刊：
影响因子：
3.3
通讯作者：
Dannemiller, Neal
中科院分区：
文献类型：
--
作者：
Li, Yaoguo;Shearer, Sarah E.;Dannemiller, Neal
在过去十年中，通过磁数据三维 (3D) 反演来恢复磁化率分布已成功用于矿物勘探。然而，当存在显着剩磁时，未知的磁化方向限制了该技术的使用。通过研究两类方法，我们开发了解决该问题的综合方法，并制定了一套实用的方法。第一类侧重于估计总磁化方向，然后将所得方向合并到假设已知方向的反演算法中。第二类侧重于磁异常矢量幅度的直接反演。振幅数据对磁化方向的依赖程度较弱，并且适合直接反演 3D 地下磁化矢量的大小。使用在加拿大北极地区进行钻石勘探时获取的两组高分辨率航磁数据来说明这些方法的有用性。
Three-dimensional (3D) inversion of magnetic data to recover a distribution of magnetic susceptibility has been successfully used for mineral exploration during the last decade. However, the unknown direction of magnetization has limited the use of this technique when significant remanence is present. We have developed a comprehensive methodology for solving this problem by examining two classes of approaches and have formulated a suite of methods of practical utility. The first class focuses on estimating total magnetization direction and then incorporating the resultant direction into an inversion algorithm that assumes a known direction. The second class focuses on direct inversion of the amplitude of the magnetic anomaly vector. Amplitude data depend weakly upon magnetization direction and are amenable to direct inversion for the magnitude of magnetization vector in 3D subsurface. Two sets of high-resolution aeromagnetic data acquired for diamond exploration in the Canadian Arctic are used to illustrate the methods' usefulness.