Anticorruption investigators are zeroing in on oil deals in Angola by one of China’s biggest energy companies, part of President Xi Jinping ’s nearly three-year probe into graft in the industry. Investigators are probing whether a former Sinopec Group chairman led the company to overpay for rights to tap offshore oil fields in Angola during his 2007-2011 reign at the company, and whether this suggests possible bribes or kickbacks, according to people familiar with the matter. The former chairman, Su Shulin, was the governor of the wealthy coastal province of Fujian when the Communist Party’s antigraft agency announced his detention on unspecified graft allegations this month. Another businessman active in the Africa-China oil trade, Sam Pa, is also under scrutiny in the same investigation, these people say. Mr. Pa, who has previously been named on a sanctions list by the U.S. government for allegedly facilitating graft in Zimbabwe, was […]