Pingchuan Zhang, China University Of Geosciences,Beijing, School of Geophysics and Information Technology, Beijing, China; Oil and Gas Survey, China Geological Survey, Beijing, China, Wencai Yang, Zhejiang University, School of Earth Sciences, Hangzhou, China, Changqing Yu, Chinese Academy Geological Sciences, Beijing, China and Yanhui Mei, China University Of Geosciences,Wuhan, Wuhan, China