张洪山，被查

Group 1 - Zhang Hongshan, former Party Secretary and Executive Director of Sinopec Shengli Oil Engineering Co., is under investigation for serious violations of discipline and law [1] - The investigation is being conducted by the Central Commission for Discipline Inspection and the National Supervisory Commission [1] - Zhang Hongshan has held various positions, including Deputy General Manager of Shengli Oilfield Branch and Vice Mayor of Dongying City, before retiring in December 2020 [4] Group 2 - Sinopec Shengli Oil Engineering Co. was established in 2013 and is a wholly-owned subsidiary of Sinopec Petroleum Engineering Technology Services Co. [4] - The company was formed by integrating and restructuring several subordinate units of Shengli Oilfield, including drilling, logging, and special operations [4] - In March 2021, certain business segments were transferred to Sinopec Jingwei Co. as part of the group's reform initiatives [4]