Biyang depression was a secondary depression in Nanxiang Basin.
泌阳凹陷是南襄盆地中的一个次级凹陷。
There are two kinds of deltas in the Northern Slope of Biyang Depression.
泌阳凹陷北部斜坡带发育有两种类型的三角洲。
Favorite conditions for oil enrichment exist in the Northern Slope zone of Biyang depression.
泌阳凹陷北部斜坡具有优越的油气富集条件。
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