I always heard of "Xiyou Seven Sisters". Which oil companies do you mean?

The traditional oil "Seven Sisters" is the pet name of seven international oil companies. Also known as the international oil cartel. These seven kilometers are Exxon, Anglo-Dutch Shell Oil Company, Mobile Company, Texaco Company, BP, California Mobile Oil Company and Gulf Oil Company.

Source: China Petroleum News Center.

The new "Petroleum Seven Sisters" are Saudi Aramco, Gazprom, China Petroleum and Natural Gas Group (CNPC), Iranian National Oil Company (NIOC), Venezuelan Petroleum Company (PDVSA), Petrobras and Petronas Malaysia. These companies control nearly one-third of the world's oil and gas production and more than one-third of oil and gas reserves.

Source: China Economic Net