(1) Time: the morning of December 19, 2011

(2) Location: About 13 nautical miles away from the terminal, pipeline damage is suspected to be caused by external causes, which has caused a natural gas leakage accident.

(3) Basic situation of the accident:On the morning of December 19, 2011, fishermen working in the relevant waters discovered the accident. The relevant person in charge of the CNOOC Shenzhen branch in charge of the CNOOC Zhuhai Hengqin natural gas processing terminal revealed at noon on the 20th that a pipeline damage on the seabed about 13 nautical miles away from the terminal has caused a natural gas leakage accident. The leaked natural gas pushes seawater into a water column. CNOOC subsequently carried out pressure relief work on the pipeline and repaired the pipeline and resumed production after 40 days. During the accident, Zhongshan City lost its main origin, its production and life were greatly affected, and its economic loss was hundreds of millions of yuan.