[1
]Statoil ASA, Exploration; NO-1364 Oslo Norway
[2
]Research Centre Rotvoll; Statoil ASA; NO-7005 Trondheim Norway
[3
]Research Centre Bergen; Statoil ASA; NO-5020 Bergen Norway
[4
]Faculty of Geosciences; Utrecht University; PO Box 80021 3508TA Utrecht The Netherlands
[5
]School of Earth and Environment; University of Leeds; Leeds LS2 9JT UK