The Permian formation in Santanghu basin with complex lithology and mineral compsition consists of tuffite, tuffaceous shale,dolomicrite,micrite and mudstone.

• 三塘湖盆地二叠系岩性复杂,矿物成分多变,有沉凝灰岩、凝灰质泥岩、泥晶白云岩、泥晶灰岩、泥岩等。