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TitreTheoretical comparison of seafloor surface renders from multibeam sonar and 3D seismic exploration data
AuteurMosher, D C; LaPierre, A B; Hughes-Clarke, J E; Gilbert, G R
SourceProceedings - Offshore Technology Conference 2002, Paper 14272, 2002, 10 pages,
Séries alt.Commission géologique du Canada, Contributions aux publications extérieures 2001216
ÉditeurOffshore Technology Conference
Réunion2002 Offshore Technology Conference; Houston, TX; US; mai 6-9, 2002
Documentpublication en série
Mediapapier; en ligne; numérique
ProvinceRégion extracotière de l'est
Lat/Long OENS -64.0000 -58.0000 44.5000 42.0000
Sujetstopographie du fond océanique; bathymétrie; talus continental; activités d'exploration; exploration; méthodes d'exploration; prospection sismique; exploration pétrolière; levés au sonar; sonar latéral; géophysique; géologie marine
Illustrations3-D images; tables; seismic reflection profiles; seismic profiles; diagrams; formulae; graphs
Diffusé2013 04 08
Résumé(disponible en anglais seulement)
Detailed sea floor surface renders (i.e. bathymetric/morphologic maps) and amplitude backscatter maps are extremely valuable and indeed necessary for offshore oil exploration and production, for both geohazard and environmental site assessment and monitoring. The continental slope off Nova Scotia has been a region of active geophysical exploration over the past three decades, but in particular over the last three years. In the summer of 2000, in excess of 22,000 km2 of multibeam hydrographic (EM-300 and EM-1002) data were acquired. These data are part of a program to understand sedimentary processes, geohazards and environmental hazards in this slope environment. The program includes significant amounts of high-resolution subbottom reflection data and shallow piston cores. At the same time, large tracts of this same ground have been covered with 3D seismic exploration data.
In deep water environments (>500 m) surface renders generated by (1) multibeam sonar and (2) first-return picks of 3D seismic reflection data over the same ground are remarkably similar on visual inspection; yet the underlying physical principals of the two technologies are quite different. Although both are based on acoustic reflection principles, the systems operate at different frequencies and different angles of incidence. This paper addresses the theoretical comparison of the two technologies and their usefulness as tools for geohazard
and geo-environmental assessment. It forms part of a larger study of the physical, statistical, and empirical attributes of surface renders and backscatter amplitude data generated by the two technologies in deep water environments on the Scotian Slope.