MQZ region is situated in the western sag of the Liaohe Depression in the Bohai Bay Basin. The ramp zone controlled by slope break is favorable for underwater fans generation.

Organic reefs in the study region form a patch reef group on the carbonate platform margin ramp and they are interruptedly distributed along the platform margin.

The nappe structures in the region is once formed in Later Cretaceous and belongs to the large scale ramp structure which is stronger in south and weaker in the north.