Model and Recovery of Primary Basin of the Mesozoic Basin in Dagang Explortation Area

The primary basin of Jurassic and Cretaceous period in Dagang exploration area is recoveried basised on previous data. The evolution of Mesozoic basin in Dagang exploration area includes three stages: early middle Jurassic, late Jurassic early Cretaceous and late Cretaceous period. The basin in Dagang exploration area is depression type which trending is NNE NE. Late Jurassic early Cretaceous basin is extension, which trending is NNE NE and WE NWW. The late Cretaceous basin is sag after extension. It is divided into two parts by Qikou Yanshan Yingang Fault Zone. The formation of basin is the result of the combining action of two tectonic dynamic systems which is subduction of the Izanaqi Plate toward European Asia Plate during Jurassic and Cretaceous Period in oblique direction and collision of North China Plate and Yangtze Plate in the late Triassic Period under the dominantly compressive stress field.