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孔隙介质中流体的核磁共振(NMR)驰豫受到固液界面效应的强烈影响.孔隙表面弛豫强度的定量观测对孔隙介质弛豫机制的研究和应用都具有十分重要的意义.利用弛豫和扩散测量,提出一种确定表面弛豫强度和分子层厚度的方法,同时得到表面流体分子的纵向与横向弛豫强度和表面相分子层厚度,并对孔隙介质双指数弛豫理论进行了讨论.
The NMR relaxation of the fluid in porous media is strongly influenced by the solid-liquid interface effect. The quantitative observation of pore surface relaxation strength is of great significance for the study and application of the relaxation mechanism of porous media. A new method to determine the surface relaxation strength and molecular layer thickness is proposed. The longitudinal and transverse relaxation strengths of the surface fluid molecules and the thickness of the surface phase molecular layer are also obtained. The double exponential relaxation theory of porous media is also discussed.