Aiming at solving the problems such as difficulty in stratigraphic division

subjectivity and ambiguity of stratigraphic correlation

this paper studied the superimposition sequence and cycle structures of strata and established corresponding geological models based on the analysis of the sedimentary sequences on outcrops and cores.We converted the structures of sedimentary cycles into signals of numerical simulation via the geological model.According to the features of the signals

we proposed the comprehensive prediction error filter method and presented its principle

steps and functions.Frequency trend lines that can reflect the stratigraphic superimposition and structures of sedimentary cycles were extracted through processing of the simulation signals

and were linked indirectly with the changes of the sedimentary environment and base level.Therefore

we can find the inflection points and trends that reflect the same isochronous stratigraphic surfaces.According to the inflection points and trends

we can perform isochronous stratigraphic comparison

providing a solid basis for precise stratigraphic division and isochronous comparison.Processing of real logging data shows that this method is valid.