Words to Describe petroleums

How petroleums often is described ("________ petroleums")

• light
• residual
• galician
• certain
• most
• representative
• various
• many
• asphaltic
• biodegraded
• viscous
• canadian
• heavy
• natural
• japanese
• conventional
• ordinary
• refined
• eastern
• liquid
• crude
• american
• heavier
• bearing
• russian
• lighter
• appalachian
• fractionated
• asphalt
• mexican
• typical
• different
• base
• blown
• caucasian