Multi-fractal Fractal Characteristics of the Heterogeneous Pore Distribution of Cores

Based on the capillary pressure curves measured at lab, the pore structures distribution features were analyzed for cores with several permeability. The comparison between methods of the single-line and two-line fitting indicated the multi-fractal characteristics of the heterogeneous pore distribution. The study shows that the fractal dimension could be used to describe such characteristics. The greater the pore structure heterogeneity of a core, the bigger the fractal dimension calculated by single-line fitting, and the larger difference between the two fractal dimensions calculated by the two-line fitting method.