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Benefits of Depth Imaging in 3D Seismic Mineral Exploration: Case Study from the Kylylahti Mine, Finland
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 81st EAGE Conference and Exhibition 2019, Jun 2019, Volume 2019, p.1 - 5
Abstract
3D seismic reflection data were acquired in the Kylylahti polymetallic mine in the Outokumpu mining district of Eastern Finland within the framework of ERA-MIN COGITO-MIN project. A mix of dynamite and Vibroseis sources was used forming a sparse and irregular pattern. Data were processed by a conventional workflow up to post-stack/pre-stack time migration, which provided a suboptimal image of the steeply-dipping Kylylahti formation. Depth imaging followed with a standard Kirchhoff pre-stack depth migration (PreSDM) and coherency-based Fresnel Volume Migration (CBFVM) using smooth velocity model obtained from the first-arrival tomography. With this approach, we were able to image the base of the Kylylahti formation as verified by a match with a borehole-constrained geological model, as well as its internal reflectivity structure with shallow, steeply-dipping reflectors.