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TitleAnalysis of wireline logs and vertical seismic profiling data acquired with fibre-optic cable at the copper-gold New Afton porphyry deposit, British Columbia
DownloadDownload (whole publication)
AuthorBellefleur, G; Schetselaar, E; Wade, D; White, D; Enkin, R; Schmitt, D R
SourceTargeted Geoscience Initiative: 2018 report of activities; by Rogers, N (ed.); Geological Survey of Canada, Open File 8549, 2019 p. 235-241, (Open Access)
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Rogers, N; (2019). Targeted Geoscience Initiative: 2018 report of activities, Geological Survey of Canada, Open File 8549
File formatpdf
ProvinceBritish Columbia
NTS92I/09NW; 92I/10NE
Lat/Long WENS-120.5500 -120.4833 50.6833 50.6333
Subjectseconomic geology; structural geology; geophysics; mineral deposits; mineral exploration; exploration methods; porphyry deposits; metals; copper; gold; ore mineral genesis; mineralization; alteration halos; alteration; geophysical logging; geophysical surveys; acoustic surveys; seismic surveys; seismic profiles; seismic waves; boreholes; bedrock geology; lithology; igneous rocks; intrusive rocks; diorites; monzonites; volcanic rocks; picrites; structural features; faults; densities; Canadian Cordillera; New Afton Deposit; ore systems approach; methodology; physical rock properties; caved-in zones; Phanerozoic; Cenozoic; Tertiary; Mesozoic; Jurassic; Triassic
Illustrationscross-sections; location maps; lithologic sections; profiles; geophysical logs; graphs; geophysical profiles; geoscientific sketch maps
ProgramTargeted Geoscience Initiative (TGI-5), Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5), Intrusion/Porphyry ore systems - arc-related porphyry systems - time and space
Released2019 03 01
AbstractWireline logs and vertical seismic profile (VSP) data were acquired in two boreholes intersecting the mineralized zone and alteration halo at the copper-gold New Afton porphyry deposit, Canada. Log data provide physical rock properties for the main lithologies and alteration zones. Calliper logs reveal many faults and caved-in zones indicating rocks with low integrity at the borehole wall. The preponderance of these zones as indicated by the logs suggests that their response may dominate the seismic reflection wavefield. Distributed acoustic sensing (DAS) was used to acquire VSP data in the boreholes surveyed with logs. Straight and helically wound fibre-optic cables used for the VSP survey housed standard fibres and a fibre engineered to increase the intensity of backscattering at the DAS interrogator. A new generation of DAS interrogator connected to the engineered fibres provided field data with lower noise level and higher signal-to-noise ratio. Data with higher signal-to-noise ratio from straight fibre-optic cable were processed and used for depth imaging. Depth images benefitted from new migration weights that account for the directional sensitivity of the straight fibre-optic cable and limit the extent of migration artefacts. Migration results show several reflectors with shallow dips to the northwest, some explained by faults intersecting the boreholes. The main sub-vertical lithological and alteration contacts at New Afton generated downgoing reflections that were not considered in the migration.