Cost-effective seismic exploration: 2D reflection imaging at the Kylylahti massive sulfide deposit, Finland

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http://hdl.handle.net/10138/301592

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Heinonen , S , Malinowski , M , Hlousek , F , Gislason , G , Buske , S , Koivisto , E A-L & Wojdyla , M 2019 , ' Cost-effective seismic exploration: 2D reflection imaging at the Kylylahti massive sulfide deposit, Finland ' , Minerals , vol. 9 , no. 5 , 263 , pp. 263-278 . https://doi.org/10.3390/min9050263

Title: Cost-effective seismic exploration: 2D reflection imaging at the Kylylahti massive sulfide deposit, Finland
Author: Heinonen, Suvi; Malinowski, Michal; Hlousek, Felix; Gislason, Gardar; Buske, Stefan; Koivisto, Emilia Anna-Liisa; Wojdyla, Marek
Contributor: University of Helsinki, Department of Geosciences and Geography
Date: 2019-05
Language: eng
Number of pages: 15
Belongs to series: Minerals
ISSN: 2075-163X
URI: http://hdl.handle.net/10138/301592
Abstract: We show that by using an advanced pre-stack depth imaging algorithm it is possible to retrieve meaningful and robust seismic images with sparse shot points, using only 3-4 source points per kilometer along a seismic profile. Our results encourage the use of 2D seismic reflection profiling as a reconnaissance tool for mineral exploration in areas with limited access for active seismic surveys. We used the seismic data acquired within the COGITO-MIN project comprising two approximately 6 km long seismic reflection profiles at the polymetallic Kylylahti massive sulfide mine site in eastern Finland. The 2D seismic data acquisition utilized both Vibroseis and dynamite sources with 20 m spacing and wireless receivers spaced every 10 m. For both source types, the recorded data show clear first breaks over all offsets and reflectors in the raw shot gathers. The Kylylahti area is characterized by folded and faulted, steeply dipping geological contacts and structures. We discuss post-stack and pre-stack data processing and compare time and depth imaging techniques in this geologically complex Precambrian hardrock area. The seismic reflection profiles show prominent reflectors at 4.5-8 km depth utilizing different migration routines. In the shallow subsurface, steep reflectors are imaged, and within and underneath the known Kylylahti ultramafic body reflectivity is prominent but discontinuous.
Subject: 1171 Geosciences
seismic reflection
massive sulfide
seismic imaging
mineral exploration
cost-effective seismics
pre-stack depth migration
Finland
Outokumpu
FRESNEL VOLUME MIGRATION
HOST ROCKS
OUTOKUMPU
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