Abstract
Multi-offset, multi-azimuth downhole seismic data were acquired at
Halfmile Lake, New Brunswick, to image known massive sulfide lenses
and investigate the potential for a steeply-dipping mineralized zone
connecting them The. massive sulfide lenses, which have significantly
higher impedances than host rocks, produce strong scattering. The
downhole seismic data shows prominent scattered and mode-converted
waves (P-P, P-S, S-S, and S-P) originating from the deposit. Such
complex scattering from massive sulfide ore has not been observed
previously in VSP data. Migration of P-P and S-S scattered wave modes
from one offset VSP partly imaged the deepest lens. The scattered
S-waves and mode-converted waves provide additional imaging capabilities
which should be considered when applying downhole seismics to mining
exploration.
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