The Penglai 19-3 oilfield is being mined by ConocoPhillips China (COPC), a subsidiary company under the U.S. energy giant ConocoPhillips, under a joint development agreement with the China National Offshore Oil Corporation, the country's largest offshore oil producer.
While COPC said last week that the oil spill had been contained and the clean-up was nearly finished, a statement issued by the SOA on Monday said investigators found that "a small amount" of oil was still leaking from platform-C of the oilfield.