1. No. 1 Institute of Geology and Mineral Resources of Shandong Province, Shandong Provincial Bureau of Geology & Mineral Resources, Jinan 250014, China
2. School of Water Conservancy and Environment, University of Jinan, Jinan 250022, China
3. College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
4. Beijing Research Center, CNOOC (China) Co., Ltd., Beijing 100010, China