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NMR Relaxation of a Liquid in Unsaturated and Dual-Porous Systems: Combined Visualized Micromodel and NMR Measurement
Jinhao Sun1,2, Peixue Jiang1,2, Ruina Xu1,2
1Key Laboratory for CO2 Utilization and Reduction Technology of Beijing, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, People's Republic of China.
Abstract:
NMR relaxometry is widely applied in natural and industrial fields for fluid characterization in porous materials. However, NMR relaxation time T2 in complex porous systems is effected by liquid-gas interfaces and interpore interactions significantly, introducing ambiguity into the interpretation of NMR measurements. Here, we extend NMR relaxometry applications to unsaturated and dual-porous systems with micro- and nanoscale pores by quantitatively clarifying the influence of liquid saturation and dual-porous features on T2 spectra through theoretical analysis, experiments, and simulations. A novel experimental method integrating visualized micromodels with NMR measurement is proposed to directly link the pore-scale fluid morphology with T2 spectra, establishing a quantitative relationship between T2 and liquid saturation in pores. We reveal that the increasing microscale pore size leads to a change from unimodal to bimodal T2 spectrum for liquid in dual-porous system, and the overall dual-porous liquid saturation can be predicted well from the established relationship. Our findings provide a basis for accurately analyzing liquid behavior in complex porous systems using NMR measurements, which is crucial for advancing the understanding of multiphase phenomena in porous materials.
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