1. School of Geosciences, University of Aberdeen, King's College, Aberdeen AB24 3UF, UK
2. Equinor Production UK Limited, Equinor House, Prime Four Crescent, Kingswells, Aberdeen AB15 8QG, UK
3. University of Manchester, Department of Earth and Environmental Sciences, Williamson Building, Oxford Road, Manchester, M13 9PL, UK
4. BP, ICBT Sunbury, Chertsey Road, Sunbury on Thames, TW16 7LN, UK