Abstract: The productivity of the same sedimentary microfacies have significant difference in the south section of Gaoyou
fault low permeability reservoir. Therefore，the study of diageneticfacies is important to low permeability reservoir，in current
development phases. Based on data of cast-slice，cathodeluminescence and SEM analyses data，the present paper comprehensively
investigats types and characteristics of reservoir diagenesis of the formation in the south section of Gaoyou fault，
distinguishs types of diageneticfacies combining practical production. The reservoir of the first segment formation could be
divided into five types of diagenticfacies including slight compacted facies，middle compacted-cemented facies，middle compacted-
corroded facies，intensively compacted-cemented facies，intensively compacted-corroded facies. We discuss logging
curve features of different diagenetic facies，establish the quantitative recognition criteria and using the recognition criteria，
we recogniz the diageneticfacies of the first segment Funing formation diageneticfacies. Combining the productivity，we also
determine beneficial diageneticfacies.

Key words: low permeability, diageneticfacies, logging curve features, quantitative evaluation, Gaoyou Depression