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。
he asked, because the entire area will smell like oil, and pin-pointing a particular source would be difficult.
因为整个区域都充满了石油味，要准确地找到一个特定的来源就显得十分困难。
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