3D diffraction signature of VHMS deposits

• Re-processing of 3D seismic reflection data from the Halfmile Lake area, New Brunswick, Canada has been carried out over a grid of 3 by 6 km with the aim of improving the seismic signatures of a 12 million ton volcanic-hosted massive sulfide (VHMS) deposit located at depth of about 1200 m, known as the Deep zone. We chose a sequence of prestack DMO and poststack migration processing algorithm in order to preserve the possible diffraction signature of the Deep zone. The DMO-stack is characterized by a large and high-amplitude asymmetric diffraction signature originating from the Deep zone. The asymmetry of the diffraction hyperbola relative to the location of the Deep zone is interpreted as a shape effect from the Deep zone, with the strongest amplitudes along the diffraction hyperbola found north-northwest of the apex, indicating that the Deep VHMS zone dips in a similar direction. This diagnostic diffraction signature could not be preserved with the prestack migration approach previously implemented for the processing of the Halfmile Lake data.

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)

Nyckelord

3D diffraction

3D seismic

Deep zone

Lake areas

Post-stack migration

Pre-stack migration

Prestack

Processing algorithms

Seismic signatures

Shape effect

Volcanic-hosted massive sulfides

Deposits

Engineering exhibitions

Petroleum industry

Seismology

Three dimensional

Diffraction

Publikations- och innehållstyp

ref (ämneskategori)

kon (ämneskategori)