The deep troughs on the Three Gorges valley bottom are formed by river downcutting along the structurally zones on the background of regional tectonic uplift.

结果表明：（1）三峡坝区河谷深槽是在三峡地区构造抬升过程中，水流顺构造裂隙强烈侵蚀下切而形成的；

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Besides the above, oil reservoirs in member 9 + 10 of Yanan formation in Jurassic are controlled by vertical migration pathway generated by riverway downcutting.

另外，侏罗系延安组延9 + 10段油气成藏还受到古河道下切形成垂向运移通道控制。

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