Gas–water two-phase displacement mechanism in fractal structure of tight sandstone gas reservoir based on nuclear magnetic resonance experiment

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Nuclear magnetic resonance determines gas-water two-phase behavior in tight sandstone, suggesting fractal dimensions affect permeability.

The increase in permeability of tight sandstone results in a decrease in bound water saturation, enhancing residual gas saturation.
Fractal dimensions of small pores were notably smaller than those of medium and large pores, influencing two-phase flow.
Nuclear magnetic resonance experiments reveal intricate gas-water flow behavior driven by pore structure complexity in tight sandstone.
Understanding these mechanisms supports efficient development strategies for tight sandstone gas reservoirs, which could optimize recovery.

Hao et al. (2025) studied this question.

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