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.
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.
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.
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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