1. University of Alabama, Department of Geological Science, Tuscaloosa, Alabama 35487, USA.(corresponding author); .
2. University of Alabama, Department of Geological Science, Tuscaloosa, Alabama 35487, USA; China University of Petroleum (East China), Qingdao 266580, China; and School of Geoscience, Dongying, China..
3. Tianjin Branch of CNOOC Ltd., Bohai Oilfield Research Institute, Tianjin, China.
4. China University of Petroleum (East China), School of Geoscience, Dongying, China..