S-Oil operates the Onsan cracking refinery, which is located in Ulsan, South Korea. According to GlobalData, who tracks and profiles more than 1,400 refineries worldwide, it is an integrated cracking owned by Saudi Arabian Oil. The refinery started operations in 1980 and has a Nelson Complexity Index (NCI) of 9.8. Buy the profile here.

Key refinery processes

Crude Distillation Unit (mbd): 580
Condensate Splitter (mbd): 89
Vacuum Distillation (mbd): 135
Catalytic Cracker (mbd): 149
Hydrocracker (mbd): 125
Hydrotreater (mbd): 332
Alkylation (mbd): 9

The capacity of the Onsan refinery is expected to remain the same as 669mbd by 2030.

Maintenance activities at Onsan cracking refinery

The Onsan refinery cracking witnessed fifteen incidents during the period 2017-2022.

About S-Oil

S-Oil Corporation Inc (S-Oil), a subsidiary of Aramco Overseas Company BV, is an oil refining and marketing company. It manufactures and sells oil refined oil, petrochemical and lube products. The company also imports and exports crude oil and refined products. It owns and operates an integrated refining lubricants and aromatic-type petrochemicals complex in Ulsan. The company’s major products include diesel, gasoline, kerosene, engine oil, bunker-C oils, lubricants, naphtha, paraffin oil, asphalt, benzene, xylene and toluene. It markets products in the domestic market through a distribution and marketing network that includes product distribution terminals, and branded retail service stations. S-Oil is headquartered in Seoul, South Korea.

For more details on the Onsan cracking refinery, buy the profile here.


GlobalData, the leading provider of industry intelligence, provided the underlying research used to produce this article.

This information is drawn from GlobalData’s Oil & Gas Intelligence Center, which provides detailed profiles of 34,000+ oil and gas fields, 400,000+ exploration blocks, 1,100+ LNG terminals, 3,400+ gas processing plants, 5,000+ storage terminals, and 8,000+ pipelines, 1,400+ refineries and 13,000+ petrochemical plants worldwide.