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Geologically driven 3D modelling of physical rock properties in support of interpreting the seismic response of the Lalor volcanogenic massive sulphide deposit, Snow Lake, Manitoba, Canada

By
Ernst Schetselaar
Ernst Schetselaar
1
Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario, K1A0E9, Canada
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Gilles Bellefleur
Gilles Bellefleur
1
Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario, K1A0E9, Canada
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James Craven
James Craven
1
Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario, K1A0E9, Canada
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Eric Roots
Eric Roots
1
Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario, K1A0E9, Canada
2
Simon Fraser University, 8888 University Dr., Burnaby, British Columbia, V5A1S6, Canada
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Saeid Cheraghi
Saeid Cheraghi
1
Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario, K1A0E9, Canada
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Pejman Shamsipour
Pejman Shamsipour
3
Département des Génies civil, École Polytechnique de Montréal, géologique et des mines, Montréal, Québec, H3C3A7, Canada
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Antoine Caté
Antoine Caté
4
Institut national de la recherche scientifique – Centre Eau Terre et Environnement 490, rue de la Couronne Québec, Québec, G1K9A9, Canada
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Patrick Mercier-Langevin
Patrick Mercier-Langevin
5
Geological Survey of Canada, 490, rue de la Couronne, Québec, Quebec, G1K9A, Canada
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Najib El Goumi
Najib El Goumi
6
Geological Survey of Canada, 490, PO. Box 6000, Sidney, British Columbia, V8L4B2, Canada
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Randolph Enkin
Randolph Enkin
6
Geological Survey of Canada, 490, PO. Box 6000, Sidney, British Columbia, V8L4B2, Canada
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Matthew Salisbury
Matthew Salisbury
7
Geological Survey of Canada-Atlantic, Bedford Institute of Oceanography, PO Box 1006, Dartmouth, Nova Scotia, B2Y4A2, Canada
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Published:
January 01, 2018

Abstract

3D lithofacies and physical rock property models were generated to interpret 3D seismic data acquired over the Lalor volcanogenic massive sulphide deposit, Manitoba, Canada. The lithofacies model revealed that strong seismic reflectivity is associated with ore–host rock and mafic–felsic lithofacies contacts, including their hydrothermally altered equivalents. Different physical rock property models were subjected to 3D seismic forward modelling using the SOFI3D finite difference code. Seismic synthetics from discrete and interpolated models in which kriging of P-wave velocity and density was conditioned by curvilinear grids conformable to the 3D-modelled geological structure showed a much better match to the seismic data in comparison with those generated by kriging in Cartesian space. Synthetics from these curvilinear grid models corroborate the origin of seismic reflectors, as qualitatively inferred from the lithofacies model. Seismic synthetics generated from physical rock property models in which physical rock properties were augmented by densely sampled secondary variables, such as FeO percentage, enhanced lateral continuity of seismic reflectivity, although these co-kriged petrophysical models were not more accurate than their kriged equivalents. The physical rock property modelling methodology was also useful for testing the utility of passive interferometric seismic surveys, as this highlighted the limitations of the discrete physical rock property model.

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Contents

Geological Society, London, Special Publications

Characterization of Ore-Forming Systems from Geological, Geochemical and Geophysical Studies

K. Gessner
K. Gessner
Geological Survey of Western Australia, Australia
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T.G. Blenkinsop
T.G. Blenkinsop
Cardiff University, UK
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P. Sorjonen-Ward
P. Sorjonen-Ward
Geological Survey of Finland, Finland
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Geological Society of London
Volume
453
ISBN electronic:
9781786203342
Publication date:
January 01, 2018

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