The reservoir quality is strongly influenced by the depositional facies and diagenesis of the Chang 2 sandstones of braided river facies in Qinghuabian oil field.

Novel appearance design, superior quality raw materials and functional design, environmental comfort and durability of its products is widely accepted by the public of the Green unobservant.

Acted by Gansu-Qinghai rotating block at the NW Liupanshan range, the Erdos block takes anti-clockwise rotation;