Weathering study of TOR II and evaluation of oil weathering properties on Eldfisk S and Ekofisk J - In relation to oil spill response and evaluation of the predicted behaviour relative to previous studies of Ekofisk oils - OC2022 A-050

Abstract

SINTEF Ocean has performed a standardized small-scale weathering study, including dispersibility testing, on TOR II. Limited laboratory studies were conducted for Ekofisk J and Eldfisk S to compare the weathering properties with previous tested Ekofisk oils with focus on the Ekofisk Blend 2000 (model oil) for environmental risk assessment and oil spill contingency for the Ekofisk area. A dispersibility study was also performed on Eldfisk S, but this was not included for Ekofisk J containing production chemicals that likely reduce the emulsification ability of the oil. The obtained laboratory data have been used to predict the weathering properties of TOR II and the Ekofisk oils by use of the SINTEF Oil Weathering Model (OWM). In addition, historical data (density) of oils from the Ekofisk area have been evaluated to assess trends and variations in the time series.