Prediction Method for Sandstone Permeability Based on Fractal Theory

Permeability is an important parameter that controls the seepage capacity of sandstone layers. The complexity of the pore structure and the strength of heterogeneity in sandstone affect the accuracy of permeability prediction. Fractal dimension can analyze the pore space structure of real rock samples from multiple dimensions and different perspectives and describe the characteristics of the pore structure. This study takes six groups of sandstones as the research objects and comprehensively uses thin section identification, HPMI (high-pressure mercury injection) experiments, and fractal theory to conduct analysis from both qualitative and quantitative dimensions. Based on the fractal theory, a permeability prediction model is constructed, and the model is optimized and corrected to establish a mathematical model suitable for predicting the permeability of sandstone.