基于CT扫描法构建数字岩心的分辨率选取研究

Study on Resolution Selection for Digital Rock Construction with CT Scanning Method

针对同一块岩心样品,基于CT扫描技术,通过调整不同的扫描分辨率构建三维数字岩心,并提取相应的孔隙网络模型。以孔隙网络模型为研究平台,对比分析不同分辨率下孔隙的微观结构特征,并确定了合理的扫描分辨率。研究表明,分辨率过低不能有效捕获岩心的微观孔隙结构特征;分辨率过高会造成数据体过大从而加长了计算时间;而合理的中分辨率不仅能够有效表征岩心孔隙的微观结构和连通性特征,而且能够大大缩减渗流计算时间,便于微观模拟技术的研究。

Based on CT scanning technology, different scanning resolutions are selected to construct digital rocks of a same core, and the corresponding pore network models are extracted. Taken the pore network model as the research platform, the microscopic structures of pore network models With different resolutions are analyzed to determine the suitable scanning resolution. It shows that, pore network model with lowest resolution could not cap- ture the effective microscopic pore structures of real core, while the pore network model with highest resolution takes too long calculation time for flow simulation. The pore network model with medium resolution is selected as the suitable model, while it could not only effectively describe the microscopic structure and connectivity character- istics of the real core, but also shorten the calculation time for flow simulation, which supplies references to the study of microscopic simulation technology.