Formation Models of Northeast Group of Cretaceous Rift Basin and Their Petroleum Geological Significance

The Cretaceous fault basin group in northeast China is the group of early cretaceous wide range volcanic fault basin which developed on the basic of paleozoic fold orogenic belt.It goes through a complete tectonic cycle from extension to extrusion,with strong extensional regime and widely developed depression.It has characteristics of complex structural style,uplifted and depression units and fracture-overlap structure.The left-lateral strike slip motion took place in early cretaceous in northern section of the Tan-Lu in the Early Cretaceous that controls the bilateral basin development.The Mesozoic fault basin group was developed on the compared newer crust,and it has a strong intermediate-acid volcanic activity.There are two lithosphere thinner areas in the Songliao and Hailer basin.The fault basin group has similar characteristics and strong volcanic fault effect.In previous studies,based on the sum of six evidences,we confirmed the existence of uplift before cracking in Songliao basin.This study started from the model of rift into basin.And we think that the east fault basin group is the narrow rift into basin model,the western and central is the wide rift into basin mode,and the fault basin group in northeast China was formed during the mantle uplift.