Abstract: The Yi-Shu graben is one of major exploring areas, along with the major exploring targets of Paleogene system in Daqing oil field. Building up a stratigraphic framework accurately is the foundation of oil exploration.A kind of layering pattern is built up depending on a great deal of data and using mathematical statistics to analyse well log and trace elements. The method solves the problems of local interfering well log and of lacking layer samples efficiently.With the six factors considered comprehensively, the stratigraphic framework of the Yi-Shu graben is set up based on biosequence and tectonic sequence and a integral and comparative program of the Yi-Shu graben is put forward. T₅,T₃,T₁ seismic reflective layers represent tectonic cycles of different stages in the basin development and T₄,T₂ seismic reflective layers represent sedimentary and climatic sequence.

Key words: Yi-Shu graben, tectonic sequence, biostratigraphic sequence, log curve, fission-track age