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Nuclear magnetic resonance simulations of nano-scale cores and microscopic mechanisms of oil shale

机译：油页岩纳米级核的核磁共振模拟及微观机理

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The mineral composition and pore structure of organic shale are complex, and studies of the porosity, seepage characteristics, and pore structure by using nuclear magnetic resonance (NMR) can be of great significance for the identification and quantitative evaluation of shale oil reservoirs. In particular, pore-scale NMR numerical simulations and core NMR experimental analyses of organic shale can provide a theoretical basis for NMR log interpretations. An ideal digital core and actual shale digital core were constructed by simulating the deposition process and using computerized tomography (CT) scanning, respectively. Then, one- and two-dimensional NMR numerical simulations were carried out by random-walk method to study the NMR responses of cores under different compaction and water saturation conditions. The microscopic NMR numerical simulations showed that as the degree of compaction increased, the porosity of the cores decreased, amplitudes of the T(2)( )distributions decreased significantly, and T-2 distributions moved toward the direction of short relaxation. As the echo spacing decreased, the T-2 distributions shifted to the left, smaller pores were measured, and NMR porosities of shale increased; these findings are consistent with those of the rock NMR experiments. In two-dimensional T-2-D maps, the signal of the wetting fluid deviated from its free diffusion coefficient line, which was indicative of restricted diffusion in tight rock. The restricted diffusion effect of water was larger than that of oil. These microscopic numerical simulations provide a physical basis for interpreting NMR macroscopic responses, and the simulated NMR responses should be helpful for fluid typing in oil shale.
机译：有机页岩的矿物组成和孔隙结构复杂，利用核磁共振（NMR）研究孔隙度，渗流特征和孔隙结构对页岩油藏的识别和定量评价具有重要意义。特别是，有机页岩的孔隙度NMR数值模拟和核心NMR实验分析可以为NMR测井解释提供理论基础。通过模拟沉积过程并使用计算机断层扫描（CT）扫描分别构建了理想的数字岩心和实际的页岩数字岩心。然后，通过随机游走法进行了一维和二维的NMR数值模拟，研究了在不同压实度和含水饱和度条件下岩心的NMR响应。显微NMR数值模拟表明，随着压实度的增加，岩心的孔隙率降低，T（2）（）分布的幅度明显降低，T-2分布向短弛豫方向移动。随着回波间隔的减小，T-2的分布向左移动，测得的孔变小，页岩的NMR孔隙率增加。这些发现与岩石NMR实验的结果一致。在二维T-2-D图中，润湿液的信号偏离其自由扩散系数线，这表明在致密岩石中扩散受到限制。水的受限扩散作用大于油。这些微观数值模拟为解释NMR宏观响应提供了物理基础，并且模拟NMR响应应有助于油页岩的流体分型。

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