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Characterisation of a Campanian deep-sea fan system in the Norwegian Sea by means of ichnofabrics
Authors:Dirk Knaust
Institution:StatoilHydro ASA, Grenseveien 21, 4035 Stavanger, Norway
Abstract:Ichnofabrics are applied in concert with sedimentological data to discriminate sub-environments within a Campanian deep-sea fan system in the Norwegian Sea. Seven ichnofabric types are recognised in the studied cores, which correspond to specific architectural elements of the fan system, including amalgamated channels, lobate sand sheets, proximal and distal overbank, fan fringe, and hemipelagic basin plain environments. A unique observation is an ultra-deep Chondrites ichnofabric, interpreted to result from the activity of a chemosymbiotic tracemaker, possibly utilising hydrothermal vents or hydrocarbon seeps in the near vicinity of an active rift system. Mapping and inter-well correlation of ichnofabrics allow a better control of lateral and vertical facies changes, which are important to exploration and production strategies. This study demonstrates that ichnofabric analysis is proving to be a valuable tool for the characterisation and prediction of reservoir quality, the recognition of potential flow barriers and prediction of lateral depositional trends in deep-sea fan deposits.
Keywords:Reservoir characterisation  Ichnology  Ichnofabrics  Deep-sea fan  Upper Cretaceous  Campanian  Norwegian Sea    ring Basin
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