Sequence stratigraphic framework and model of the continental basins in China

The geological basements for sequence stratigraphy of continental and marine basins are different in structure,sediment,main controlling factors of sequence formation,hydrocarbon generation and migration,etc.New concepts and methods must be introduced into the study of sequence stratigraphy in continental basins to classify and compare sequences,and to buildup isochronous frameworks and models.The concept of condensed body,main controlling factors of lacustrine sedimentary sequence,classification of system tracts,and research methods of continental sequence stratigraphy are discussed.Based on the analysis of the sequence features in all kinds of continental basins,together with exploration situation in continental basins of recent years and the possibility to establish continental basin sequence stratigraphic models,the continental basins are divided into 2 or 3 system tracts according to the existence of slop breaks.And different sequence stratigraphic frameworks and models are set up for the 3 types of continental basins-rifted basins,depressed basins and intracontinental foreland basins,providing theoretical basis for oil exploration in continental basins.