A finite-difference modeling analysis of mode-converted scattering from massive sulfidedeposits, Bathurst mining camp, Canada
2012 (English)Conference paper, Abstract (Refereed)
We present elastic finite-difference modeling results over ageologically realistic 2D representation of the HalfmileLake volcanic-hosted massive sulfide deposit, NewBrunswick, Canada. The model is constrained bygeological information from surface mapping andboreholes whereas petrophysical properties are provided bywireline logging data acquired in two boreholesintersecting different parts of the deposit. We analyzed theP-P, P-S, S-P, and S-S responses of the Lower and Deepmineralized zones and assessed some compositional effectsby substituting massive sulfides with gabbro properties inthe model. Finite-difference modeling results predictcomplex scattering including P-P, P-S, S-P, and S-S wavesgenerally having strongest amplitudes in the stratigraphydown-dip direction. The P-S, S-P, and S-S scattered waves,if properly recorded on multi-component data, representuseful signal that could help the targeting of deep sulfidemineralization. Finite-difference simulations further revealphase-reversals on P-P wavefields scattered at the massivesulfide zones. The phase reversals are not observed forgabbro inclusions, suggesting that this signature could beused to discriminate gabbro units from sulfidemineralization. The FD simulation successfully reproducesmany events of the VSP data, in particular P-S and S-Sevents on the radial component and P-P and S-P events onthe vertical component.
Place, publisher, year, edition, pages
IdentifiersURN: urn:nbn:se:uu:diva-286429DOI: 10.1190/segam2012-0069.1OAI: oai:DiVA.org:uu-286429DiVA: diva2:921527
SEG Las Vegas 2012 Annual Meeting