Comparison of predicted properties of Ekofisk oils based on Crude Assay data - Evaluation of the predicted behaviour of satellites relative to previous studies.

The weathering properties of three oil blends, Ekofisk J, Eldfisk B and Eldfisk Kompleks, were compared with the existing model oil, Ekofisk Blend 2000, using the Crude Assay module in the SINTEF Oil Weathering Model, supplemented with a limited laboratory study (on the 250 °C+ residues). The observed variations between the tree oil blends and Ekofisk Blend 2000 were small. The continued use of Ekofisk Blend 2000 as model oil for environmental risk assessment and contingency analysis was assessed, and deemed valid.