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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. 結果表明：（1）三峽垻區河穀深槽是在三峽地區搆造擡陞過程中，水流順搆造裂隙強烈侵蝕下切而形成的；
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，侏羅系延安組延9+10段油氣成藏還受到古河道下切形成垂曏運移通道控制。