1. China University of Petroleum-Beijing, School of Geophysics, State Key Laboratory of Petroleum Resources and Prospecting, Changping 102249, Beijing, China and CNPC, Key Laboratory of Geophysical Exploration, Changping 102249, Beijing, China.(corresponding author); .
2. Research Institute of Petroleum Exploration and Development, Petrochina, Geophysics Institute, Northwest Branch, Lanzhou 730020, China..