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High-resolution 3D-seismic data indicate focussed fluid migration pathways above polygonal fault systems of the mid-Norwegian margin ArchiMer
Hustoft, S; Mienert, Jurgen; Bunz, S; Nouze, Herve.
Seismic attribute analysis and interpretation of high-resolution 3D- and 2D-seismic data reveal focussed fluid flow processes through the gas hydrate stability zone (GHSZ) at the northern flank of the giant Storegga Slide. Diffusive fluid migration predominantly starts from a widespread polygonal fault system in fine-grained sediments of the Miocene Kai Formation. The overlying 600-700 m thick Plio-Pleistocene Naust Formation shows spatially related soft-sediment deformation and overlying fluid conduits. A low relief antiform structure connects to an overlying 250 m high, 300 m wide and 3 km elongated columnar zone, where seismic signatures suggest self-enhanced permeability, i.e. natural hydraulic fracturing. "Push-down" effects create an elongated...
Tipo: Text Palavras-chave: Acoustic pipes and pockmarks; Feeding of methane to hydrate deposits; Hydraulic fracturing; Polygonal faulting; Norwegian margin.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-4077.pdf
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