在各类砂岩中，水道砂岩是很特殊的。

The channel type is very unusual, of all the types of sandstone.

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砂问题是疏松砂岩油气层开发过程中永恒的主题。

Sand production and sand control are main problems during development of loose sand.

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砂问题是疏松砂岩油气层开发过程中永恒的主题。

Sand production and sand control are main problems during development of loose sand.

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