关键词: 层序地层, 经典理论, 基准面旋回, 沉积转换面, 洪泛面, 层序界面

Abstract: Because different sequence stratigraphy theories often render divergent results during the process of oil exploration and development,a multi-theory amalgamation about the sequence stratigraphy is necessary to be developed.The difference between the classical theory and the high-resolution sequence stratigraphy is resulted by the difference between the water level and the base level.The water level is a measurable and physical surface able to be characterized,while the base level is an immeasurable and nonobjective surface,which can be described only.The feature of the base level leads to the uncertainty of the time scale for the base level cycle and then results in the subjectivity of the sequence subdivision.The base level cycle theory must be modified properly to get the syncretism of the other sequence stratigraphy theory according to the production situation of oilfields and the subject development.It is suggested that the definition of base level cycle should be modified as a set of formation deposited from the descending to ascending stage of the base level instead of that from its ascending to descending stage.The definition was applied to sequence stratigraphy division of E_s3²⁺³ formation in Gaoshangpu Oilfield,the result shows that can deal with the petroleum development problem to a great extent.

Key words: sequence stratigraphy, classical theory, base level cycle, deposition transition surface, flooding surface, sequence boundary