noun
shale oil
Technical term for oil extracted from oil shale; used in energy and geology contexts.
シェールオイルの採掘は環境への影響が懸念されている。
There are concerns about the environmental impact of shale oil extraction.
Variant with interpunct; less common but still seen.
Shale gas is natural gas trapped in shale formations, while shale oil is liquid oil extracted from oil shale.
Loanword from English 'shale oil'.