A uncompensated oil generation sag formed when foredeep basin rapidly subsided,and back-bulge basin developed into a semi-restricted oil generation sag under the blockage of foreland uplift.

• 前渊盆地快速沉降过程中发育欠补偿生油凹陷，在前陆隆起阻挡作用下隆后盆地形成半局限环境生油凹陷。