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