Three-dimensional reflection seismic imaging of the iron oxide deposits in the Ludvika mining area, Sweden, using Fresnel volume migration
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Published:2022-05-17
Issue:5
Volume:13
Page:917-934
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ISSN:1869-9529
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Container-title:Solid Earth
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language:en
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Short-container-title:Solid Earth
Author:
Hloušek Felix, Malinowski MichalORCID, Bräunig Lena, Buske StefanORCID, Malehmir AlirezaORCID, Markovic Magdalena, Sito Lukasz, Marsden PaulORCID, Bäckström EmmaORCID
Abstract
Abstract. We present pre-stack depth-imaging results for a case study of 3D reflection
seismic exploration at the Blötberget iron oxide mining site belonging
to the Bergslagen mineral district in central Sweden. The goal of the study
is to directly image the ore-bearing horizons and to delineate their
possible depth extension below depths known from existing boreholes. For
this purpose, we applied a tailored pre-processing workflow and two
different seismic imaging approaches, Kirchhoff pre-stack depth migration
(KPSDM) and Fresnel volume migration (FVM). Both imaging techniques deliver
a well-resolved 3D image of the deposit and its host rock, where the FVM
image yields a significantly better image quality compared to the KPSDM
image. We were able to unravel distinct horizons, which are linked to known
mineralization and provide insights on their possible lateral and depth
extent. Comparison of the known mineralization with the final FVM reflection
volume suggests a good agreement of the position and the shape of the imaged
reflectors caused by the mineralization. Furthermore, the images show
additional reflectors below the mineralization and reflectors with opposite
dips. One of these reflectors is interpreted to be a fault intersecting the
mineralization, which can be traced to the surface and linked to a fault
trace in the geological map. The depth-imaging results can serve as the
basis for further investigations, drilling, and follow-up mine planning at
the Blötberget mining site..
Publisher
Copernicus GmbH
Subject
Paleontology,Stratigraphy,Earth-Surface Processes,Geochemistry and Petrology,Geology,Geophysics,Soil Science
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