1. Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China.
2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, 102249, China.
3. Corresponding author.
4. CGGVeritas Services (Singapore) Pte Ltd, 9 Serangoon North Avenue 5, 554531, Singapore.