China National Offshore Oil Corp, or CNOOC, the country's largest offshore oil and gas producer, said on Tuesday that it will offer 25 new offshore blocks for cooperation projects with foreign companies.

Seventeen of the blocks are located in the South China Sea, three in the East China Sea and five in the Yellow Sea and Bohai Sea.

CNOOC will invite foreign firms to bid for oil and gas projects in the blocks, according to a statement on its website.