Abstract: Oil/gas sequence stratigraphy is a new comprehensive borderline subject developed on the basis of seismic stratigraphy, sequence stratigraphy and petroleum geology.In fact, it is an origin unit analysis techniques of oil/gas sequences in isochronal formation framework.It includes methods of seismic, well log and outcrop sequence stratigraphies and can be applied to study stratigraphy sequences of petroliferous basin combined with computer and simulation techniques, make a stratigraphic correlation and analysis of the source-reservoir-cap assemblage and petroliferous system, and further point out favourable oil/gas exploration areas, specially non-structured petroliferous reservoirs.The basic principle and study method of oil/gas sequence stratigraphy in marine facies petroliferous basin are suitable for transitional and terrestrial facies petroliferous basins.

Key words: Oil/gas formation, Sequence stratigraphy, Seismic stratigraphy, Log interpretation, Outcrop, Sequence, Transit environment, Continental basins