Abstract: The fractal dimension calculated from mercury injection curves is used for quantitative characterization of heterogeneity in micro-porosity structure of reservoir. A method of the grid refinement of case dimension-based log calibration is presented. The fractal dimension given from single sand body logs is applied for quantitative characterization of macroscopic heterogeneity in inner- and inter-layer. These two fractal dimensions are combined to develop a reservoir fractal model by which the microscopic heterogeneity's quantitative characterization can be expanded into the macroscopic heterogeneity's quantitative characterization of single sand body. An example of fluvial facies sandstone reservoir in a water flood oilfield at stage of moderate-high water cuts is taken for this study, and perfect effectiveness for application is obtained.

Key words: reservoir, heterogeneity, fractal, fractal dimension, model