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在纳米和微孔岩石中建模有效扩散以进行准确的NMR孔径分析

Michał Fajt¹, Grzegorz Machowski², Bartosz Puzio²

¹Faculty of Geology, Geophysics and Environmental Protection, AGH University of Krakow, al. Adama Mickiewicza 30, Kraków, 30-059, Poland. mfajt@agh.edu.pl.

Scientific reports

|October 21, 2025

概括

新的有效扩散立方体 (EDC) 模型通过考虑扩散效应来改善狭窄岩石中低场NMR孔径分布分析. 这提高了石化物理特征的准确性.

科学领域:

地质物理学地质物理学
石化物理学石化物理学
核磁共振光谱学核磁共振光谱学

背景情况:

低场NMR (LF-NMR) 对于孔径大小分布 (PSD) 分析在多孔性材料中至关重要.
由于扩散假设,传统的LF-NMR方法在纳米和微孔系统中经常产生系统性错误.
准确的孔隙特征对于了解流体流动和在紧密岩石中的储存至关重要.

研究的目的:

引入有效扩散立方体 (EDC) 模型,用于基于LF-NMR的PSD估计.
解决和纠正LF-NMR测量中的扩散引起的扭曲.
为了提高在紧密形成的石质物理特征的准确性和物理一致性.

主要方法:

开发有效扩散立方体 (EDC) 模型框架.
纳入依赖孔径大小的有效扩散系数和内部磁场梯度.
使用后勤函数对有效扩散系数进行参数化,以近似T2放松分析的Pade形式.

主要成果:

在LF-NMR PSD估计中,EDC模型成功地纠正了扩散引起的扭曲.
应用于状核样本的PSD与参考数据更接近,而不是传统模型.
该模型证明了对T2放松的扩散效应的改进量化.

结论:

EDC方法提供了一种物理一致且更准确的方法,用于在紧密岩石中量化PSD.
这一进步提高了基于NMR的石质物理表征的可靠性.
EDC模型是分析地质构成中复杂孔隙系统的宝贵工具.

关键词:

扩散扩散是一种扩散.内部梯度是指内部的梯度.低场NMR (LF-NMR) 是一种低场NMR.毛孔大小分布 (PSD) 是指毛孔的大小分布.表面的宽松性表面的宽松性

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Pore Size Distribution

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