Reflection seismic imaging of subsurface geological structures in the Bayan Obo mining area, China

IF 3 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Geophysics Pub Date : 2023-10-26 DOI:10.1190/geo2023-0232.1

Yikang Zheng, Yibo Wang, Jien Zhang, Ya Xu, Liang Zhao

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Abstract

A dense 2D seismic reflection survey was conducted at the Bayan Obo REE (rare-earth-elements)-Nb-Fe deposit in China to explore its geological features and mineral endowment. A composite processing workflow was established for prestack depth imaging of this dataset, which involved static correction to compensate for shifts caused by lateral inhomogeneities in near-surface layers and rugged topography. Standard methods were used to attenuate different types of noise and improve the signal-to-noise ratio of the data. A velocity model in the depth domain was obtained from refraction tomography and velocity analysis, and then used in migration. The preliminary interpretation of the final image revealed the mapping of mineralization at its true position in depth, indicating a relatively deep extension (∼1.5 km). The results demonstrate the potential of seismic imaging as a complementary exploration tool to gravity and electromagnetic methods for mineral exploration purposes in the Bayan Obo mining area, providing a high-resolution seismic image and allowing for depth characterization of the mineral deposits. Additionally, the images provide important information for guiding the selection of drilling borehole locations for deep exploration.

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白云鄂博矿区地下构造反射地震成像

对中国白云鄂博稀土铌铁矿进行了密集二维地震反射测量，探讨了该矿床的地质特征和矿产赋存状况。建立了该数据集叠前深度成像的复合处理流程，其中包括静校正，以补偿近地表横向不均匀性和崎岖地形造成的偏移。采用标准方法衰减不同类型的噪声，提高数据的信噪比。通过折射层析成像和速度分析得到了深度域的速度模型，并将其用于偏移。对最终图像的初步解释揭示了矿化在其真实深度位置的映射，表明相对较深的延伸(~ 1.5 km)。结果表明，在白云鄂博矿区，地震成像作为重力和电磁勘探方法的补充勘探工具，具有提供高分辨率地震图像和矿床深度表征的潜力。此外，这些图像还为指导深部勘探钻孔位置的选择提供了重要信息。

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来源期刊

Geophysics 地学-地球化学与地球物理

CiteScore

6.90

自引率

18.20%

发文量

354

审稿时长

3 months

期刊介绍： Geophysics, published by the Society of Exploration Geophysicists since 1936, is an archival journal encompassing all aspects of research, exploration, and education in applied geophysics. Geophysics articles, generally more than 275 per year in six issues, cover the entire spectrum of geophysical methods, including seismology, potential fields, electromagnetics, and borehole measurements. Geophysics, a bimonthly, provides theoretical and mathematical tools needed to reproduce depicted work, encouraging further development and research. Geophysics papers, drawn from industry and academia, undergo a rigorous peer-review process to validate the described methods and conclusions and ensure the highest editorial and production quality. Geophysics editors strongly encourage the use of real data, including actual case histories, to highlight current technology and tutorials to stimulate ideas. Some issues feature a section of solicited papers on a particular subject of current interest. Recent special sections focused on seismic anisotropy, subsalt exploration and development, and microseismic monitoring. The PDF format of each Geophysics paper is the official version of record.