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Hard Rock VSP - The Case of the Missing P-wave
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 79th EAGE Conference and Exhibition 2017, Jun 2017, Volume 2017, p.1 - 5
Abstract
Summary
Previous published examples have mentioned the lack of usable P-to-P-wave reflection image (PP-up) compared to the usable P-to-S-wave reflection image (PS-up) for hard rock platinum mining 3D Vertical Seismic Profiles (VSPs) in the South African Bushveld complex. We investigate the lack of PP-up amplitude in a rig source VSP acquired in an area of the Bushveld complex where the economic zone occurs with significant dip. The VSP clearly illustrates the problem of missing PP reflections in all types of VSP surveys and surface seismic far gathers in such hard rock areas. It is also a reminder that what might seem like a simple VSP still requires careful planning, processing and interpretation of all three components.
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