Reflection image beyond the known extent of the prospective zone provided by 3D virtualsource methodology

M. Chamarczuk, D. Draganov, M. Malinowski, E. Koivisto, S. Heinonen, S. Rötsä

Tutkimustuotos: Artikkeli kirjassa/raportissa/konferenssijulkaisussaKonferenssiartikkeliTieteellinenvertaisarvioitu

Abstrakti

We apply a full-scale 3D seismic virtual-source survey (VSS) for the purpose of near-mine mineral exploration in the Kylylahti sulfide deposit, Finland. Based on the ambient-noise (AN) characterization including beamforming results, we created a 10-days subset of AN recordings that were dominated by multi-azimuth high-velocity arrivals. We use an illumination-diagnosis and location procedure to show that the AN recordings associated with the high apparent velocities are related to body-wave events. Next, we produce 994 virtual-source gathers by applying seismic-interferometry processing by crosscorrelating AN at all receivers resulting in a full 3D VSS. We apply standard 3D time-domain reflectiondata processing and imaging using the subset and the full AN data, and validate both results against a pre-existing detailed geological information and 3D active-source data processed in the same way as the passive data. The resulting post-stack migrated sections show agreement of reflections between the passive and active data and indicate that VSS provides images where the active-source data are not available. In particular, the previously unknown extent of the ore-bearing complex was captured exclusively by passive data, which added a new geological insight into the Kylylahti formation. The methodological approach developed can be used in other areas in mineral exploration context.

Alkuperäiskielienglanti
Otsikko83rd EAGE Conference and Exhibition 2022
Sivumäärä5
KustantajaEuropean Association of Geoscientists and Engineers, EAGE
Julkaisupäivä6 kesäk. 2022
Sivut572-576
ISBN (elektroninen)9781713859314
DOI - pysyväislinkit
TilaJulkaistu - 6 kesäk. 2022
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisuussa
Tapahtuma83rd EAGE Conference and Exhibition 2022 - Madrid, Virtual, Espanja
Kesto: 6 kesäk. 20229 kesäk. 2022

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Nimi83rd EAGE Conference and Exhibition 2022
Vuosikerta1

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Copyright © 2022 by the European Association of Geoscientists & Engineers (EAGE). All rights reserved.

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