Both compositional and textural maturities of the sandstone are low, whereas such reservoir features as porosity and permeability are generally high.

岩石的成分成熟度和结构成熟度普遍低，而储层物性通常却很好。

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In Kuche area, the sandstone reservoir is characterized by low porosity, low permeability and high pressure, and pore texture is complex, so, it is very difficult for reservoir log evaluation.

库车地区砂岩储层以高压低孔隙度低渗透率为显著特征，且储层结构复杂，给储层测井评价带来很大困难。

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Upper Paleozoic natural gas reservoir of Ordos Basin consists of low-permeability sandstone which bears typical secondary porosity.

鄂尔多斯盆地上古生界天然气储集体是一套以次生孔隙为主的低渗透砂岩。

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