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Nuclear magnetic resonance (NMR) microscopic simulation based on random-walk: Theory and parameters analysis简 总被引:1,自引:0,他引:1
The microscopic response characteristics of nuclear magnetic resonance (NMR) are widely used for characterizing complex pore structures of rocks. Due to the prohibitive NMR experiment cost, numerical simulation was employed as an alternative approach to verify some theoretical aspects of NMR responses. Firstly, the basic principles of pore-scale NMR simulation based on random-walk method (RWM) were introduced. The RWM-simulated results were benchmarked with the analytical results for an ideal spherical pore model. Then, the effects of two numerical parameters, namely diffusion radius and walk numbers, were studied on the simulation accuracy. The simulation method is then applied to various pore models with different pore sizes and pore shapes filled with different fluids to study the microscopic NMR response characteristics. The numerical experiments are useful for understanding and interpreting NMR measurements and the simulation code provides a numerical tool to perform pixel-based digital rock analysis. 相似文献
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致密砂岩等非常规储层孔隙空间复杂,常规驱替等实验手段不能满足其岩石物理研究精度和时效性要求,亟需大力发展测井数字岩石物理分析技术。在分析测井数字岩石物理研究技术发展历史的基础上介绍了近年来在配套设备、模拟方法等方面取得的进展。结合致密砂岩储层特征讨论了该技术现阶段面临的4个主要问题和挑战:①分辨率与储层非均质性之间存在矛盾严重影响模拟精度;②图像分割与构建数字孔隙格架过程的多解性强;③缺乏能够模拟黏土矿物影响的方法模型;④现有模拟方法的时效性亟需优化完善。指出了该技术近期需重点攻关的2个方向为多分辨率三维孔隙网络整合和趋势云分析技术。 相似文献
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