1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, P. R. China
2. Petro Bio Oil Consulting, Tallahassee, Florida 32312, United States
3. Department of Chemical and Biomedical Engineering, Florida A&M University/Florida State University, Tallahassee, Florida 32310, United States
4. Institute of Environmental and Biogeochemistry (ebig), School of Earth Sciences, Zhejiang University, Hangzhou, Zhejiang 310027, P. R. China
5. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou 510640, P. R. China
6. Bureau of Economic Geology, University of Texas at Austin, 10100 Burnet Road, Austin, Texas 78758-4445, United States