- 责任者：Liu Shuang (Institute of Geophysics and Geomatics ; China University of Geosciences ; Wuhan 430074 ; China) ; Feng Jie
- 刊名：Chinese Journal of Geophysics
- 出版年：2013
- 卷期：56(12)
- 关键词：磁法勘探 ; magnetic prospecting ; 井中物探 ; well geophysical exploration
- 页码：p.4297-4309
- 图表：9 illus., 1 table, 27 refs.
- 分类号：1600
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
Significant remanence and demagnetization alter the intensity and orientation of total magnetization, which complicates interpretation of magnetic data. To deal with the problem, we propose a method of inverting 2D magnetization vector distributions using the 2D borehole magnetic data. We firstly invert the magnetization intensity distributions based on magnetic anomaly amplitudes of borehole magnetic data. With the known magnetization intensity distributions, subsequently, we invert the magnetization orientation distributions by fitting the magnetic component anomalies. Both magnetization intensity and orientation are solved by conjugate gradients. And a preconditioned matrix is utilized to improve the inverse quality of magnetization intensity. All synthetic examples involving significant remanence and high susceptibility demonstrate that this method is capable of accurately recovering the magnetization vector distributions. The magnetization vector distributions comprehensively include the influences of induced magnetization, remanent magnetization and sel~demagnetization. Therefore, it provides an effective approach to study the ore deposits when high susceptibility and significant remanent magnetization are present.