The Baiyinchagan sag is a half graben basin with a fault in the northern side and an overlap in the southern side, where the main oil source and reservoir is lower Cretaceous series.

• 白音查干凹陷是一个北断南超的箕状断陷湖盆 ,其主要生油、储油层系为下白垩统 ,主要发育冲积扇及扇三角洲沉积。