nongraded ; poorly sorted
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研究结果表明，该区含油气储集层具有分选性差、泥岩含量低、物性差的特征，属于低孔-特低渗型储集层。
The result shows that there exist the features of poor sorting, low shale content and poor physical properties in the reservoirs, which belong to low-porosity and extra-low-permeability reservoirs.
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