A finite-difference modeling analysis of mode-converted scattering from massive sulfide deposits, Bathurst mining camp, Canada
2012 (English)Conference paper, Abstract (Refereed)
We present elastic finite-difference modeling results over a geologically realistic 2D representation of the Halfmile Lake volcanic-hosted massive sulfide deposit, New Brunswick, Canada. The model is constrained by geological information from surface mapping and boreholes whereas petrophysical properties are provided by wireline logging data acquired in two boreholes intersecting different parts of the deposit. We analyzed the P-P, P-S, S-P, and S-S responses of the Lower and Deep mineralized zones and assessed some compositional effects by substituting massive sulfides with gabbro properties in the model. Finite-difference modeling results predict complex scattering including P-P, P-S, S-P, and S-S waves generally having strongest amplitudes in the stratigraphy down-dip direction. The P-S, S-P, and S-S scattered waves if properly recorded on multi-component data, represent useful signal that could help the targeting of deep sulfide mineralization. Finite-difference simulations further reveal phase-reversals on P-P wavefields scattered at the massive sulfide zones. The phase reversals are not observed for gabbro inclusions, suggesting that this signature could be used to discriminate gabbro units from sulfide mineralization. The FD simulation successfully reproduces many events of the VSP data, in particular P-S and S-S events on the radial component and P-P and S-P events on the vertical component.
Place, publisher, year, edition, pages
2012. 1-5 p.
, SEG Technical Program Expanded Abstracts, ISSN 1949-4645
IdentifiersURN: urn:nbn:se:uu:diva-291348DOI: 10.1190/segam2012-0069.1OAI: oai:DiVA.org:uu-291348DiVA: diva2:925320
2012 SEG Annual Meeting, 4-9 November 2012, Las Vegas, Nevada, USA