核磁共振T_(2)谱与孔喉半径定量关系——兼与高压压汞法获得值对比  

The Quantitative Relationship between Nuclear Magnetic Resonance T_(2) Spectrum and Pore-throat Radius Combined with High Pressure Mercury Injection Technique

作　　者：郑娟 蔡晟 蒋志煌 赖秀英 ZHENG Juan;CAI Sheng;JIANG Zhihuang;LAI Xiuying(School of Civil Engineering,Putian University,Putian Fujian 351100,China;Yiyao(Fujian)Construction Co.,Ltd,Putian Fujian 351100,China;Fujian Xinggang Construction Engineering Co.,Ltd,Putian Fujian 351100,China)

机构地区：[1]莆田学院土木工程学院,福建莆田351100 [2]亿耀(福建)建设有限公司,福建莆田351100 [3]福建兴港建工有限公司,福建莆田351100

出　　处：《莆田学院学报》2022年第5期22-29,共8页Journal of putian University

基　　金：福建省自然科学基金资助项目(2020J01910,2020J05208)。

摘　　要：基于核磁共振的原理,推导横向弛豫时间T_(2)与孔喉半径的关系,并结合高压压汞法获得的孔喉半径分布曲线,利用插值和最小二乘法,将100%饱和状态的核磁共振T_(2)谱转换为孔喉半径分布曲线。通过整合同类研究,主要获得了以下认识:1)高压压汞法与核磁共振法获取的孔喉半径分布不能直接进行对比分析,应去除高压压汞法无法分析的孔隙部分;2)核磁共振T_(2)谱与孔喉半径分布符合幂函数规律。核磁共振T_(2)谱转换后获得的孔喉半径分布曲线与高压压汞法获得的孔喉半径分布曲线的趋势一致,而两条曲线吻合程度的高低与试验样品孔喉半径、渗透性能有关,喉道半径越小,渗透率越低,两条曲线差异就越大。反之亦然。Based on the principle of NMR,the relationship between transverse relaxation time T_(2) and pore throat radius is derived.Combined with the pore throat radius distribution obtained by high pressure mercury injection,the NMR T_(2) spectrum in 100%saturated state is converted to pore throat radius distribution by interpolation and least squares.Through the integration of similar studies,the following understandings have been obtained:1)The pore throat radius distribution obtained by high-pressure mercury injection and NMR technology cannot be directly compared and analyzed,and the pore that cannot be analyzed by high-pressure mercury injection should be removed;2)The NMR T_(2) spectrum and the distribution of the pore throat radius accord with the law of power function.The trend of the distribution curve of the transformed NMR pore throat is consistent with that of the high-pressure mercury injection pore throat radius,and the degree of coincidence of the two curves is related to the pore throat radius and the permeability of the test sample.The smaller the pore throat radius,the lower the permeability,the greater the difference between the two curves,and vice versa.

关 键 词：核磁共振 横向弛豫时间T_(2) 微观结构特征 孔喉半径 高压压汞 

分 类 号：TU458.3[建筑科学—岩土工程]