1. Chinese Academy of Sciences, Institute of Geology and Geophysics, Key Laboratory of Petroleum Resources Research, Beijing, China; University of Chinese Academy of Sciences, College of Earth and Planetary Sciences, Beijing, China; and Chinese Academy of Sciences, Innovation Academy for Earth Science, Beijing, China.
2. Chinese Academy of Sciences, Institute of Geology and Geophysics, Key Laboratory of Petroleum Resources Research, Beijing, China and Chinese Academy of Sciences, Institutions of Earth Science, Beijing, China.
3. Chinese Academy of Sciences, Institute of Geology and Geophysics, Key Laboratory of Petroleum Resources Research, Beijing, China and Chinese Academy of Sciences, Institutions of Earth Science, Beijing, China. (corresponding author)