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RESEARCH ARTICLE Calcareous Interlayer Causes and Logging Identification for the Shawan Formation of the Chunfeng Oilfield Qingjie Hou, Qiang Jin, Weizhong Li, Lamei Lin, Wenmin Jiang and Wenjie Han 1 School of Geosciences, China University of Petroleum, No.66 Changjiang West Road, Huangdao District, Qingdao, Shandong 266580, P.R. China 2 Research Institute of Geological Science, Sinopec Shengli Oilfield Company, Dongying, Shandong 257017, P.R. China Guangzhou Institute of Geochemistry,Chinese Academy of Sciences, Guangzhou, Guangdong 510000, P.R. China