1. Institute of Geology & Geophysics, Chinese Academy of Sciences, Beijing 100029, People's Republic of China
2. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, People's Republic of China
3. Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education of China, China University of Geosciences, Beijing 100083, People's Republic of China