David A Boutelier, University of Newcastle, Callaghan, Australia, Laura Quigley, Queensland University of Technology, Earth, Environmental and Biological Sciences, Geology & Geochemistry, Brisbane, Australia, Christoph Eckart Schrank, Queensland University of Technology, School of Earth, Environmental and Biological Sciences, Brisbane, Australia and Klaus Regenauer-Lieb, University of New South Wales, North Ryde, NSW 2052, School of UNSW petroleum engineering, Sydney, Australia