凝灰质砂岩属于火山碎屑岩的一种，（碎屑物粒径0.1-2mm），以正常沉积为主，含一定数量的火山碎屑（<50%）的岩石类型。
储层类型主要包括基岩风化壳、砂岩、凝灰质砂岩和砾岩。
The types of reservoirs main include base rock weathering crust, sandstone, tuffaceous sandstone and conglomerate.
通过岩矿检测，得知梅园石属于凝灰质砂岩，孔隙率较大。
It was found that Meiyuan stone is a tuffaceous sandstone of high porosity.
包古图组主要为一套深海—半深海相的灰、灰黑色薄层状凝灰质粉砂岩、凝灰质泥岩，与灰绿色、灰色薄层状沉凝灰岩不均匀互层。
Bao ancient group plans for a major deep-sea - a half deep in the ash, black ash-like TLC tuffaceous siltstone, shale tuffaceous, with gray green, with thin gray-tuff interbedded uneven.
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