通过对遗留二维地震数据进行重点叠前深度迁移,对布什维尔德复合体西缘西南部的复杂地质结构进行地震成像

IF 1.8 3区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Mpofana Sihoyiya, Felix Hloušek, Musa S. D. Manzi, Moyagabo K. Rapetsoa, Stefan Buske, David Khoza
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引用次数: 0

摘要

我们对 1986 年获得的 50 公里长的遗留二维反射地震剖面进行了重新处理,该项目由国家地球物理计划资助,目的是改进对布什维尔德复合体西缘东南边缘含铂地层(称为 UG2 礁;铬铁矿地层)的复杂地质结构的划分,并调查厚覆盖层下铂礁的连续性。通过常规处理步骤提高了叠前地震数据的质量。我们采用了标准的基尔霍夫叠前深度迁移和先进的一致性迁移技术。这两种成像技术都获得了铂矿床、其悬壁和底壁岩石的良好结构图像。特别是,相干迁移技术在复杂的断层区域提供了更好的图像,使人们更好地了解了断层活动与铂金矿床分布之间的相互关系,以及构造事件的相对年代学。此外,横穿剖面的区域地质构造(鳄鱼河断层和陈坑构造)也得到了清晰的界定。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Seismic imaging of the complex geological structures in the southwestern edge of the Western limb, Bushveld Complex through focusing pre-stack depth migration of legacy 2D seismic data

Seismic imaging of the complex geological structures in the southwestern edge of the Western limb, Bushveld Complex through focusing pre-stack depth migration of legacy 2D seismic data

We reprocessed a 50-km long legacy 2D reflection seismic profile acquired in 1986, under a project funded by the National Geophysics Program to improve the delineation of complex geological structures that host the platinum-bearing horizons (known as the UG2 reef; a chromitite horizon) on the south-eastern edge of the Western limb of the Bushveld Complex and to investigate the continuity of the reef below the thick cover. The pre-stack seismic data quality was improved through conventional processing steps. We applied standard Kirchhoff pre-stack depth migration as well as advanced coherency migration techniques. Both imaging techniques yielded good structural images of the platinum deposits, their hanging wall and footwall rocks. In particular, the coherency migration technique has provided significantly better images in complex faulted regions, yielding a better understanding of the interrelationship between fault activity and platinum deposit distribution, and the relative chronology of tectonic events. Moreover, the regional geological structures (Crocodile River fault and Chaneng structure) that crosscut the profile are clearly defined.

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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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