lithophysa

, 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，其中流纹岩、球粒流纹岩及熔结凝灰岩为有储层。

Large scale planar geological mapping, profiling survey and microfabric analyses proved that lithophysa structure was developed in rhyolite in Yingcheng coal mine area, Jiutai City.

摘要通过大比例尺平面地质续图、剖面测量和显微组构分析，九台营城煤矿区流纹岩中构造发育。