軽けい質しつ油ゆけいしつゆMeanings1nounlight crude oilTechnical term used in petroleum refining and energy industries. Contrasts with 重質油 (heavy crude oil).See also: 重質油軽けい質しつ油ゆはガソリンやナフサの原げん料りょうとして重じゅう要ようです。Light crude oil is important as a raw material for gasoline and naphtha.