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：该区火山划分为火山熔和火山碎屑两大类，其中石泡、球粒及熔结凝灰为有储层。

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.

摘要通过大比面地质续图、剖面测量和显微组构分析，九台营城煤矿区中石泡构造发育。