Print Email Facebook Twitter Improved target illumination at Ludvika mines of Sweden through seismic-interferometric surface-wave suppression Title Improved target illumination at Ludvika mines of Sweden through seismic-interferometric surface-wave suppression Author Balestrini, F.I. (TU Delft Applied Geophysics and Petrophysics) Draganov, D.S. (TU Delft Applied Geophysics and Petrophysics) Malehmir, Alireza (Uppsala University) Marsden, Paul (NIO (Nordic Iron Ore AB)) Ghose, R. (TU Delft Applied Geophysics and Petrophysics) Date 2020 Abstract In mineral exploration, new methods to improve the delineation of ore deposits at depth are in demand. For this purpose, increasing the signal-to-noise ratio through suitable data processing is an important requirement. Seismic reflection methods have proven to be useful to image mineral deposits. However, in most hard rock environments, surface waves constitute the most undesirable source-generated or ambient noise in the data that, especially given their typical broadband nature, often mask the events of interest like body-wave reflections and diffractions. In this study, we show the efficacy of a two-step procedure to suppress surface waves in an active-source reflection seismic dataset acquired in the Ludvika mining area of Sweden. First, we use seismic interferometry to estimate the surface-wave energy between receivers, given that they are the most energetic arrivals in the dataset. Second, we adaptively subtract the retrieved surface waves from the original shot gathers, checking the quality of the unveiled reflections. We see that several reflections, judged to be from the mineralization zone, are enhanced and better visualized after this two-step procedure. Our comparison with results from frequency-wavenumber filtering verifies the effectiveness of our scheme, since the presence of linear artefacts is reduced. The results are encouraging, as they open up new possibilities for denoising hard rock seismic data and, in particular, for imaging of deep mineral deposits using seismic reflections. This approach is purely data driven and does not require significant judgment on the dip and frequency content of present surface waves, which often vary from place to place. Subject Data processingLudvika minesSeismic InterferometrySeismicsSurface waves To reference this document use: http://resolver.tudelft.nl/uuid:018fa4b8-9f9f-4c82-ba05-8d2d9059723c DOI https://doi.org/10.1111/1365-2478.12890 ISSN 0016-8025 Source Geophysical Prospecting, 68 (1), 200-213 Part of collection Institutional Repository Document type journal article Rights © 2020 F.I. Balestrini, D.S. Draganov, Alireza Malehmir, Paul Marsden, R. Ghose Files PDF Balestrini_et_al_2019_Geo ... ecting.pdf 30.03 MB Close viewer /islandora/object/uuid:018fa4b8-9f9f-4c82-ba05-8d2d9059723c/datastream/OBJ/view