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<p>This study examines permeability response to pore structure evolution under effective stress in six sandstone reservoirs of varying physical properties, using CTS, SEM, QEMSCAN, DP-NMR, fractal theory, and pore compression theory. The sandstones comprise quartz (82.56%), rock fragments (7.60%), clay minerals (5.66%), siliceous (0.1%–4.3%, avg. 2.21%), and carbonate (0.05%–6.95%, avg. 1.8%) cements, with intergranular pores, micropores, and minor intragranular dissolution pores. Stress sensitivity increases from Type I to III: large pores exhibit the highest sensitivity in Types I and III (compressibility: 0.011 and 0.005 MPa<sup>−1</sup>), while small pores dominate in Type II (0.008 MPa<sup>−1</sup>). Fractal dimensions of small/total pores (DS, DT) decrease in Types I/III, whereas in Type II, DT increases and DS first decreases then increases due to clay minerals; large pore fractal dimension (DL) increases modestly across all types. Permeability stress sensitivity is controlled by large pore volume changes, which correlate exponentially with effective stress. A predictive permeability model based on pore volume stress-strain theory provides theoretical guidance for hydrocarbon production.</p>

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Dynamic permeability response and stress sensitivity of tight sandstone reservoirs: insights from pore structure and predictive modeling

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Guanglei Ren

摘要

This study examines permeability response to pore structure evolution under effective stress in six sandstone reservoirs of varying physical properties, using CTS, SEM, QEMSCAN, DP-NMR, fractal theory, and pore compression theory. The sandstones comprise quartz (82.56%), rock fragments (7.60%), clay minerals (5.66%), siliceous (0.1%–4.3%, avg. 2.21%), and carbonate (0.05%–6.95%, avg. 1.8%) cements, with intergranular pores, micropores, and minor intragranular dissolution pores. Stress sensitivity increases from Type I to III: large pores exhibit the highest sensitivity in Types I and III (compressibility: 0.011 and 0.005 MPa−1), while small pores dominate in Type II (0.008 MPa−1). Fractal dimensions of small/total pores (DS, DT) decrease in Types I/III, whereas in Type II, DT increases and DS first decreases then increases due to clay minerals; large pore fractal dimension (DL) increases modestly across all types. Permeability stress sensitivity is controlled by large pore volume changes, which correlate exponentially with effective stress. A predictive permeability model based on pore volume stress-strain theory provides theoretical guidance for hydrocarbon production.