博茨瓦纳金伯利岩的磁性表面几何反演

IF 1.8 3区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Saeed Vatankhah, Peter G. Lelièvre, Kitso Matende, Kevin Mickus
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引用次数: 0

摘要

地球物理数据的地表几何反演是生成地表地质模型的一种有效方法。通过地表几何反演获得的模型可以清晰地划分出不同岩石单元之间的接触点,便于地质学家进行解释。地表几何反演在其他工作中已显示出良好的初步结果,但地表几何反演在实际地球物理数据中的实际应用尚未得到深入研究。为了更好地了解相关的实际情况,我们将表面几何反演应用于在博茨瓦纳中北部两个金伯利岩管道上获取的真实磁数据集。目的是评估地表几何反演方法在准确描述地下几何特征和识别金伯利岩管边界方面的有效性和局限性。我们首先采用异常分离法分离出与金伯利岩管相关的磁异常。使用各种初始模型和其他控制参数,对原始数据集和分离的数据集采用表面几何反演算法。为了研究数据处理、初始模型和其他参数选择对地表几何反演结果的影响,进行了多次测试。我们成功地恢复了两个金伯利岩管道的几何形状、延伸和倾角。我们讨论了各种测试结果,并为有兴趣在数据中应用表面几何反演方法的从业人员提供了建议。我们的工作表明,表面几何反演可作为体素反演的一种补充方法,我们提出了一种迭代表面几何反演算法,作为简单地质情况下体素反演的一种可能替代方法。这项工作为在实际地球物理数据集上适当应用表面几何反演提供了宝贵的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Magnetic surface geometry inversion of Kimberlites in Botswana

Surface geometry inversion of geophysical data has recently been introduced as an effective approach for generating surface-based geological models. The models obtained through surface geometry inversion clearly delineate the contacts between distinct rock units, making them easily interpretable by geologists. Surface geometry inversion has shown promising preliminary results in other works, but the practical application of surface geometry inversion on real geophysical data has not been thoroughly investigated. To move towards a better understanding of the practicalities involved, we applied surface geometry inversion to a real magnetic dataset acquired over two kimberlite pipes located in north-central Botswana. The objective was to assess the effectiveness and limitations of the surface geometry inversion approach in accurately characterizing the subsurface geometry and identifying the boundaries of the kimberlite pipes. We first perform an anomaly separation approach to isolate the magnetic anomalies associated with the kimberlite pipes. A surface geometry inversion algorithm was applied to the original and separated datasets using various initial models and other control parameters. Several tests were performed to investigate the effects that data processing, initial models, and other parameter choices have on the surface geometry inversion results. We successfully recover the geometry, extension and dip of the two kimberlite pipes. We discuss the results of our various tests and provide advice for practitioners interested in applying surface geometry inversion methods to their data. Our work indicates that surface geometry inversion can be used as a complementary approach to voxel inversion, and we propose an iterative surface geometry inversion algorithm as a possible alternative approach to voxel inversion for simple geological scenarios. This work provides valuable insights into the appropriate application of surface geometry inversion on real geophysical datasets.

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来源期刊
Geophysical Prospecting
Geophysical Prospecting 地学-地球化学与地球物理
CiteScore
4.90
自引率
11.50%
发文量
118
审稿时长
4.5 months
期刊介绍: Geophysical Prospecting publishes the best in primary research on the science of geophysics as it applies to the exploration, evaluation and extraction of earth resources. Drawing heavily on contributions from researchers in the oil and mineral exploration industries, the journal has a very practical slant. Although the journal provides a valuable forum for communication among workers in these fields, it is also ideally suited to researchers in academic geophysics.
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