*Onema Christopher Adojoh¹, Marret-Davies Fabienne², Tetsuji Muto³ (1.Missouri Univetrsity of Science and Technology, Rolla, USA, Dept of Geoscience, Geological and Petroleum Engineering, 1400 North Bishop, Post Code 65401, 2.School of Environmental Sciences, University of Liverpool, L69 7ZT, UK, 3.Nagasaki University, Japan, Dept of Environmental Science and Fisheries, 1-14 Bunkyomachi, Nagasaki, 8528521)

*Junhui Wang^1,2,3, Tetsuji Muto³ (1.China University of Petroleum (Beijing), 2.State Key Laboratory of Petroleum Resources and Prospecting, China, 3.Nagasaki University)

*Junhui Wang^1,2,3, Tetsuji Muto³ (1.China University of Petroleum (Beijing), 2.State Key Laboratory of Petroleum Resources and Prospecting, China, 3.Nagasaki University)