The IOOC operations in the Persian Gulf are divided into two zones: the northern zone which includes oilfields around Kharg Island and ones near Iranian port of Bahregan. The Southern zone of the company's operations includes areas near islands Sirri, Lavan, Kish, Qeshm.
The IOOC has the production capacity of over 640,000 b/d.
In 2012, IOOC signed a contract worth $6.6 billion, with Iran's power projects management company (MAPNA) for developing the Forouz B gas field in the Persian Gulf and generating electricity from the produced natural gas.
In early 2015, IOOC acquired the "world's largest oil tanker" with a capacity of 2.2 million barrels of crude oil. It is named "Persian Gulf". South Korea's Samsung started building this floating storage unit (FSU) in 2008 and finished it at a cost of about $300 million.