1. State Key Laboratory of Petroleum Resources and Prospecting, Beijing Key Laboratory of Petroleum Pollution and Control, College of Geosciences, China University of Petroleum, Beijing, China;
2. State Key Laboratory of Biogeology and Environmental Geology, Institute of Earth Sciences, China University of Geosciences, Beijing, China;
3. Department of Geology and Environmental Earth Science, Miami University, Oxford, OH, USA;
4. Department of Biological Sciences, University of Alaska Anchorage, Anchorage, AK, USA