软土是指以水下沉积的软弱粘性土或淤泥为主的地层，有时也夹有少量的腐泥或泥炭层。

The soft soil refers to the soft clay deposited under water or mud-based formation, sometimes with a small amount of rot folder mud or peat layer.

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泌阳断陷沉积了巨厚的老第三系稳定的湖相水下沉积，深凹区是主要的生油区，地层极平缓。

The layers in the deep depression which was the main oil source area are almost horizontal.

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泌阳断陷沉积了巨厚的老第三系稳定的湖相水下沉积，深凹区是主要的生油区，地层极平缓。

There is great thickness of lake sediments of Eogene in Biyang rifted-basin. The layers in the deep depression which was the main oil source area are almost horizontal.

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