Abstract:

The tectonic evolution and basin development of the Mesozoic in North China are characterized by stages.Accordingly,the Mesozoic Erathem can be divided into six sedi-mentary entities:1.P₂²-T₁ or T₁₊₂;2.T₂₊₃ or T₃;3.J₁₊₂;4.J₃-K₁;5.K₂;6.K₃-E₁.Most of the Meso-Cenozoic basins in North China have vertically multilayer texture;different sedimentary entities are separated by uncomformities,disconformities or para-conformities.This kind of multilayer textures,named as superimposed basins,were result-ed by the superimposition of sedimentary formations formed in different basin-forming stages.The superimposition of the basins could be divided into three types,that is intra-overlapping,lateral overlapping and drape and five styles such as composite,mosaic-like,cross,single-basin and multi-basin drapes.Hydrocarbons usually occur in complecated su-perimposed basins.Through the comparison of hydrocarbon occurrences,it is suggested that the Paleozoic-generated Mesozoic reservoirs will be the main type within three marjor basins in Xinjiang,and Erlian and Jiuxi types will be the main types in Songliao-North China,Hailar-Erlian-Badan Jaran and the Hexi corridor region for hydrocarbon exploration.