There was a terrestrial facies lake basin in study area and mainly developed clastic rock during the late Trias.
研究区晚三叠系为陆相湖盆沉积，以发育陆源碎屑岩系为主。
Subei basin is a terrestrial facies faulted basin which main body is the Tertiary. It has the typical dustpan like fault structure.
苏北盆地是以第三系为主体的陆相断坳型盆地，具有典型的箕状断陷结构。
In west Qaidm Basin, 17 oilfields with Tertiary source rocks have been found. The main source rocks are Lower Ganchaigou Formation of terrestrial facies of Eocene.
柴达木盆地西部已找到17个第三系油源的油田，其主要烃源岩层位是陆相始新统下干柴沟组。
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