oil refining; petroleum refining
Technical and industrial term for the process of refining crude oil into usable products.
Oil refining is the main industry in this region.
A new oil refining technology has been developed.
石油 means 'petroleum' or 'crude oil', while 石油精製 refers specifically to the refining process.
精製 means 'refining' or 'purification' in general; 石油精製 narrows it to oil refining.
Compound of 石油 (petroleum) and 精製 (refining).