CHEN, Yong, Department of Geology, School of Geosciences, China University of petroleum, No.66 West Changjiang Road, Economic and Technological Development Zone, Qingdao, Shandong, 266580, China, yongchenzy@upc.edu.cn, GE, Yunjin, Research Institute of Yanchang Petroleum (GROUP)Co. Ltd, Xi'an, 710075, China, FANG, Shihu, PetroChina Exploration and Development Institute, Beijing, 100083, China, ZHOU, Yaoqi, Department of Geology, School of Geosciences, China University of petroleum, No.66 West Changjiang Road, Economic and Technological Development Zone, Qingdao, 266580, China, and ZHOU, Zhenzhu, College of Geological Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, China