Revenue rose 6.9 percent year-on-year to 59.15 billion yuan ($9.50 billion) in the first quarter as realised oil prices dipped 5.1 percent to $104.63 per barrel, the company said. CNOOC does not report quarterly profit figures.
CNOOC last month posted a worse-than-expected 11.4 percent slide in its 2013 net profit amid flagging production growth, rising costs and weakening crude prices.
CNOOC shares closed up 0.47 percent ahead of the results announcement. The stock was one of the worst performers among major exploration and production companies globally in 2013 due to worries about its output growth outlook and the premium it paid to acquire Nexen.