1. University of Bergen, Department of Earth Science, Allegaten 41, 5020 Bergen, Norway..
2. Southwest Jiaotong University, Faculty of Geosciences and Environmental Engineering, Chengdu 610031, China.(corresponding author).
3. Jilin University, College for Geo-exploration Science and Technology, 938 Ximinzhu Street, Changchun 130026, China..
4. Formerly Imperial College London, South Kensington Campus, Department of Earth Science and Engineering, London SW7 2AZ, UK, presently Total E&P UK, Tarland Road, Westhill, Aberdeen AB32 6JZ..