模型空间细分对三维磁异常反演的影响

IF 1.9 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Bairu Zhao, Houpu Li, Henglei Zhang
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引用次数: 0

摘要

三维磁反演可以提供异常体的空间位置、几何形状和物理参数分布等信息,在磁探测中起着至关重要的作用。模型空间细分的大小决定了反演分辨率,目前对于模型空间细分精度的选择尚无共识,阻碍了模型空间细分精度的实际应用。通过探讨细分精度与三维反演有效性之间的关系,为模型空间细分规模的选择提供依据。采用多组理论磁模型进行三维反演,模型空间细分大小不同,利用反演磁化模型与理论磁化模型的相关系数评价反演精度。结果表明,随着模型细分间距减小到观测数据间距的0.5倍,反演精度不断提高,细分精度的进一步提高对反演精度影响较小。因此,建议反演的模型细分间距为观测数据间距的一半。模型试验和某矿区磁场数据的应用表明,采用0.5倍观测数据间距的模型空间细分得到的反磁化强度明显优于一般1倍观测数据间距得到的反磁化强度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Influence of Model Space Subdivision on Three-Dimensional Magnetic Anomaly Inversion

Three-dimensional (3D) magnetic inversion plays a critical role in magnetic exploration by providing information about the spatial location, geometric shape, and distribution of physical parameters of anomalous bodies. The size of the model space subdivision determines the inversion resolution, while there is currently no consensus regarding the selection of subdivision accuracy for model space, which hampers its practical application. By discussing the relationship between subdivision accuracy and the effectiveness of 3D inversion, this study aims to provide a basis for the selection of the size of the model space subdivision. Multiple sets of theoretical magnetic models are used for 3D inversion with different size of the model space subdivisions, and the correlation coefficient between the inverted magnetization model and the theoretical magnetization model is used to evaluate the inversion accuracy. The results showed that the inversion accuracy continuously increases as the model subdivision spacing decreases to 0.5 times of the observed data spacing, and further improvement in the subdivision accuracy affect slightly the inversion accuracy. Therefore, it is suggested that the model subdivision spacing for inversion could be half of the observed data spacing. The applications of the model tests and field magnetic data from a mining area demonstrated that the inverted magnetization obtained using the size of the model space subdivision of 0.5 times the observed data spacing are significantly better than those obtained using the general 1 time the observed data spacing.

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来源期刊
pure and applied geophysics
pure and applied geophysics 地学-地球化学与地球物理
CiteScore
4.20
自引率
5.00%
发文量
240
审稿时长
9.8 months
期刊介绍: pure and applied geophysics (pageoph), a continuation of the journal "Geofisica pura e applicata", publishes original scientific contributions in the fields of solid Earth, atmospheric and oceanic sciences. Regular and special issues feature thought-provoking reports on active areas of current research and state-of-the-art surveys. Long running journal, founded in 1939 as Geofisica pura e applicata Publishes peer-reviewed original scientific contributions and state-of-the-art surveys in solid earth and atmospheric sciences Features thought-provoking reports on active areas of current research and is a major source for publications on tsunami research Coverage extends to research topics in oceanic sciences See Instructions for Authors on the right hand side.
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