Abstract: Reservoir distribution and the heterogeneity within reservoir rocks are dominated by varying diagenesis,Up this knowledge allows studies on the quantltative distribution of the effective reservoir rocks with respect to their geologic process and clarification of the diagenetic facies with various porosities and permeabilities,Futhermore,the study is ex-tended from a point to an overall 3-D quantitative analysis by establishing discriminant correlation models between diagenesis and sedimentology,seismology and well-logging.Eventually the paper suggests a new approach to estimating reservoir capacity by diagenetic facies-pore volume.