The study shows that Songliao basin was a deep-water lacustrine basin during the deposition stage of Cretaceous Qingshankou-Nenjiang period.

• 结果表明：白奎系青山口组到嫩江组沉积时期，松辽盆地为深水拗陷湖盆，沿长轴方向为缓坡，短轴方向为陡坡。