Effect of Pore Structure Heterogeneity of Sandstone Reservoirs on Porosity–Permeability Variation by Using Single–Multi-Fractal Models
Peng Yao, Junjian Zhang, Zhenyuan Qin, Aiping Fan, Guangjun Feng, Veerle Vandeginste, Pengfei Zhang, Xiaoyang Zhang
TL;DR
This study examines how pore structure heterogeneity in sandstone affects porosity and permeability using fractal models.
Contribution
The study introduces the use of single- and multi-fractal models to quantify pore structure heterogeneity in sandstone reservoirs.
Findings
The Sierpinski model's fractal dimension correlates strongly with pore volume percentage, making it effective for characterizing fracture distribution.
Porosity and permeability decrease as a power function with increasing confining pressure, with significant changes at a critical pressure threshold.
Permeability variation is more sensitive to confining pressure than porosity, and pore structure parameters do not directly influence compressibility.
Abstract
Pore structure heterogeneity affects sandstone porosity and permeability and thus sandstone gas productivity. A total of 17 sandstone samples collected from the northwestern margin of the Junggar Basin in Xinjiang Province are investigated in this study. The pore-fracture system distribution of target sandstones is studied by high-pressure mercury injection tests. On this basis, single- and multi-fractal models are used to characterize pore structure heterogeneity, and the applicability of four models (Menger model, Sierpinski model, Thermodynamic model, multifractal model) to characterize pore and fracture distribution heterogeneity are discussed. Moreover, a correlation between fractal dimension, pore structure parameters, and variation coefficient of porosity–permeability is discussed based on overburden permeability test results. The results are as follows. (1) DS (fractal dimension…
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Taxonomy
TopicsHistorical and Environmental Studies · Diverse academic and cultural studies