PRELIMINARY OBSERVATIONS OF A PALEO-SEDIMENTARY SYSTEM USING 3-D SEISMIC, OFFSHORE NEWFOUNDLAND, EASTERN CANADA
M.A. WILLIAMSON, J. SHTMELD, K. DICKIE, R.A. FENSOME, V. PASCUCCI, K. COFLIN, D.B. PRIOR, 1996. "PRELIMINARY OBSERVATIONS OF A PALEO-SEDIMENTARY SYSTEM USING 3-D SEISMIC, OFFSHORE NEWFOUNDLAND, EASTERN CANADA", Stratigraphic Analysis Utilizing Advanced Geophysical, Wireline and Borehole Technology for Petroleum Exploration and Production, Jory A. Pacht, Robert E. Sheriff, Bob F. Perkins
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Petroleum industry 3-D seismic data over the Hibernia Oil field, offshore eastern Canada, allows high resolution imaging of a shelf indenting submarine canyon system of Paleocene age. This canyon provided a point source of sediments for a lowstand wedge and basin floor fans preserved elsewhere in the basin and together form a well preserved Lowstand Systems Tract. Now buried by up to 2 kilometres of sediment, the quality and resolution of coverage allows mapping, visualization, and interpretation of canyon morphology and the palco-shelf sedimentary environments.
Morphological differences along the course of the canyon provide clues to the geological mechanisms that initiated and modified the feature. These include changes in hydrodynamic regimes, slumping, headward erosion, and fluvial incision. Although not drilled, the nature of the Canyon’s fill is indicated by significant positive seismic relief over a portion of its length. This is attributed to differential compaction implying relatively coarse sediment fill. Comparison with recent outer shelf and upper slope canyon systems such as studied in the Gulf of Mexico’s Mississippi, Lavaca, and Yoakum canyons reveal several similarities.