Reservoir spaces in tight sandstones: Classification, fractal characters, and heterogeneity

Because of differences in reservoir space types and heterogeneity, the enrichment and distribution of tight gas and oil changes with the distance between the reservoir layers and the source rocks. The tight reservoirs dominated by nano-scale spaces are also incorporated into the exploration and development goals in areas adjacent to source rocks. However, in areas located far from source rocks, the tight reservoirs dominated by micro-scale spaces should be the preferred targets for tight gas and oil.