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Applications of Accommodation Concept to Sequence Study in a Continental Rift Basin in Case of Paleogene,Bohaiwan Basin

Chi Yingliu (Scientific Research Institute of Petroleum Exploration and Development,CNPC,Beijing,100083)  
The concept of depositional accommodation has been applied to sequence genesis analysis and sequence division for continental rift basins with examples from Paleogene,Bohaiwan basin.The developing process and its major characteristics of a sequence,a qarasquence set and a parasequence in a continental rift basin can be interpretted respectively according to the changing of new space added during the 2nd,the 3rd and the 4th order episodic tectonic subsidence in corresponding to the volume of sediments supplied.Conditions to form bounded surfaces of sequences and systems tracts can also be described and understood through an analysis of depositional accommodation changes.As a result of accommodation evolution analysis,a new concept,the turn-round surface of accommodation variation, has been introduced and applied to recognize boundaries of sequences and systems tracts.
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