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3D diffraction and mode-converted scattering signatures of base metal deposits, Bathurst Mining Camp, Canada

机译：加拿大巴瑟斯特采矿营地的贱金属沉积物的3D衍射和模转换散射特征

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摘要

The localized and isolated nature of base-metal deposits can generate a complex scattered wavefield that may include P-P, P-S, S-P, and S-S events. Multi-component VSP data have previously confirmed the presence of several wave types scattered by a deep-seated base metal deposit at Halfmile Lake, Bathurst Mining Camp, Canada. However, mode-converted waves scattered from a massive sulphide deposit have not previously been recognized on surface seismic data. In this study, we used 3D surface seismic data acquired with an explosive source and vertical geophones to investigate the possible presence of P-P, PS, S-P, and S-S events scattered at a base metal, lens-shaped body at about 1.2 km depth. We show that this body produces a diagnostic P-P diffraction and use finite-difference modelling to show it could produce mode-converted scattered signals. Results from a target-oriented azimuthal scattering analysis based on 3D prestack migration reveal amplitude anomalies at the location of the base metal lens for S-P waves and possibly P-S waves. The identification of these events confirms that mode-converted waves scattered from the deep sulphide lens were recorded on the 3D data. However, the real potential of these complementary wave modes for mineral exploration will only be realistically evaluated using P- and S-wave sources and multi-component receivers.
机译：贱金属沉积物的局部和隔离性质可能会产生复杂的散射波场，其中可能包括P-P，P-S，S-P和S-S事件。多分量VSP数据先前已经证实了加拿大巴瑟斯特采矿营地Halfmile Lake的深部贱金属矿床所散布的几种波型的存在。但是，以前从未在地表地震数据中认识到从块状硫化物矿床散射的模转换波。在这项研究中，我们使用了通过爆炸源和垂直地震检波器获得的3D表面地震数据，研究了散布在约1.2 km深度的贱金属透镜状体中的P-P，PS，S-P和S-S事件的可能存在。我们表明，该物体产生诊断性P-P衍射，并使用有限差分建模来显示它可以产生模式转换的散射信号。基于3D叠前偏移的面向目标方位角散射分析的结果表明，对于S-P波和可能的P-S波，基本金属透镜的位置存在振幅异常。对这些事件的识别证实了从深部硫化物透镜散射的模式转换波已记录在3D数据上。但是，只有使用P波和S波源以及多分量接收器才能实际评估这些互补波模式在矿物勘探中的实际潜力。

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