The volcano lava, pyroclastic rock and volcanic sedimentary rock are the main lithology of the Carboniferous volcanic reservoir in the middle section of the northwestern margin of Junggar Basin.

• 准噶尔盆地西北缘中段石炭系火山岩油藏的储层岩性为火山熔岩、火山碎屑岩及火山沉积岩。