ignimbrite

, volcanic lava and pyroclastic rocks, of which the lithophysa rhyolite, pellets rhyolite and ignimbrite are favorable reservoirs.Lithofacies can be divided into 5 facies and 16 subfacies.

研究表明：该区火山岩划分为火山熔岩和火山碎屑岩两大类，其中石流纹岩、球粒流纹岩及熔结凝灰岩为有利储层。