Improved structural interpretation of legacy 3D seismic data from Karee platinum mine (South Africa) through the application of novel seismic attributes
Improved structural interpretation of legacy 3D seismic data from Karee platinum mine (South Africa) through the application of novel seismic attributes
复制标题
通过应用新的地震属性，改进了 Karee 铂矿（南非）遗留 3D 地震数据的结构解释
DOI：
10.1111/1365-2478.12900
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发表时间：
2019
影响因子：
2.6
通讯作者：
R. Durrheim
中科院分区：
文献类型：
--
作者：
M. Manzi;G. Cooper;A. Malehmir;R. Durrheim
对断层、岩脉、坑洞和富含铁的超镁铁伟晶岩体的地震探测对铂矿行业非常重要，因为这些结构影响安全和效率。常规地震属性(如瞬时振幅、相位和频率)在硬岩环境中的应用比在软岩环境中更具挑战性，因为地质往往复杂，反射中断，地震能量强烈分散。我们开发了新的地震属性，可以锐化地震反射，使更多的结构信息能够从坚硬的岩石地震数据中提取出来。对称性属性基于对象相对于诸如旋转和反射的变换的不变性；它独立于道反射幅度，因此更好地指示薄反射和弱反射的横向连续性。反射连续性检测器属性基于希尔伯特变换；它增强了地震道的波峰和波谷的可见性，从而增强了弱反射的连续性。我们通过将这些新的地震属性应用于来自南非布什维尔德复合体的遗留3D地震数据集来演示它们的有效性。这些地震属性显示了对深部薄(∼1.5m厚)铂矿体及其相关的复杂地质结构(断层、岩脉、坑洞和富铁超镁铁伟晶岩)的良好探测。它们提供了一种快速、经济、高效的解释工具，当与基于层位的地震属性相结合时，可以揭示常规解释中看不到的结构。
Seismic detection of faults, dykes, potholes and iron‐rich ultramafic pegmatitic bodies is of great importance to the platinum mining industry, as these structures affect safety and efficiency. The application of conventional seismic attributes (such as instantaneous amplitude, phase and frequency) in the hard‐rock environment is more challenging than in soft‐rock settings because the geology is often complex, reflections disrupted and the seismic energy strongly scattered. We have developed new seismic attributes that sharpen seismic reflections, enabling additional structural information to be extracted from hard‐rock seismic data. The symmetry attribute is based on the invariance of an object with respect to transformations such as rotation and reflection; it is independent of the trace reflection amplitude, and hence a better indicator of the lateral continuity of thin and weak reflections. The reflection‐continuity detector attribute is based on the Hilbert transform; it enhances the visibility of the peaks and troughs of the seismic traces, and hence the continuity of weak reflections. We demonstrate the effectiveness of these new seismic attributes by applying them to a legacy 3D seismic data set from the Bushveld Complex in South Africa. These seismic attributes show good detection of deep‐seated thin (∼1.5 m thick) platinum ore bodies and their associated complex geological structures (faults, dykes, potholes and iron‐rich ultramafic pegmatites). They provide a fast, cost‐effective and efficient interpretation tool that, when coupled with horizon‐based seismic attributes, can reveal structures not seen in conventional interpretations.