1. School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK
2. Wintershall Dea GmbH, Friedrich-Ebert-Straße 160, 34119 Kassel, Germany
3. CSIRO Energy, 26 Dick Perry Avenue, Kensington, 6151 WA, Australia
4. Badley Geoscience Ltd, North Beck House, North Beck Lane, Hundleby, Spilsby, Lincolnshire PE23 5NB, UK