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。