Geologically, the rock mass of the Mogao Grottoes is semi-binder calcirudite of the quaternary sediment of very loose structure.
莫高窟岩体在地质学上属第四纪沙泥质、钙质半
岩，
十分
。
岩;钙质屑灰岩;钙质岩;屑灰岩Geologically, the rock mass of the Mogao Grottoes is semi-binder calcirudite of the quaternary sediment of very loose structure.
莫高窟岩体在地质学上属第四纪沙泥质、钙质半岩，十分。
Mainly developed are fan - delta, deep lake turbidite and calcirudite deposit, and also alluvial fan deposit in early period.
时期形成的砂岩和粒屑灰岩储集体,为油气储集提供了有利的场所。
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