Abstract: There is strong vertical heterogeneity in sandy conglomerate reservoir. In this paper, based on typical layered sandy conglomerate image, representative core slices of different layers are chosen and the corresponding digital rocks are reconstructed respectively. Then, mergence method is developed to construct the sandy conglomerate digital rock core and the corresponding pore network model is extracted. Meanwhile, traditional method is used to construct the corresponding pore network model. At last, the structures and permeability characteristics of sandy conglomerate pore network models obtained from above two methods are compared and analyzed. The results show that the sandy conglomerate pore network model with mergence method could effectively describe the pore structure characteristics; and it also can describe the horizontal and vertical permeability differences effectively, so as to provide an effective way for the rock core characterization and flow mechanism analysis in sandy conglomerate reservoir.

Key words: sandy conglomerate media, digital rock core, core mergence, pore network model, rock core properties