1. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
2. CAS Center for Excellence in Deep Earth Science, Guangzhou 510640, China
3. University of Chinese Academy of Sciences, Beijing 100049, China
4. Research Institute of Exploration and Development, PetroChina Changqing Oilfield, Xi’an 710018, China