The development and stimulation of oil and gas fields are inseparable from the experimental analysis of reservoir rocks. Large number of experiments, poor reservoir properties and thin reservoir thickness will lead to insufficient number of cores, which restricts the experimental evaluation effect of cores. Digital rock physics (DRP) can solve these problems well. This paper presents a rapid, simple, and practical method to establish the pore structure and lithology of DRP based on laboratory experiments. First, a core is scanned by computed tomography (CT) scanning technology, and filtering back-projection reconstruction method is used to test the core visualization. Subsequently, three-dimensional median filtering technology is used to eliminate noise signals after scanning, and the maximum interclass variance method is used to segment the rock skeleton and pore. Based on X-ray diffraction technology, the distribution of minerals in the rock core is studied by combining the processed CT scan data. The core pore size distribution is analyzed by the mercury intrusion method, and the core pore size distribution with spatial correlation is constructed by the kriging interpolation method. Based on the analysis of the core particle-size distribution by the screening method, the shape of the rock particle is assumed to be a more practical irregular polyhedron; considering this shape and the mineral distribution, the DRP pore structure and lithology are finally established. The DRP porosity calculated by MATLAB software is 32.4%, and the core porosity measured in a nuclear magnetic resonance experiment is 29.9%; thus, the accuracy of the model is validated. Further, the method of simulating the process of physical and chemical changes by using the digital core is proposed for further study.

油气田的开发与增产与储层岩石的实验分析是分不开的。大量的实验，较差的储层特性和较薄的储层厚度将导致岩心数量不足，从而限制了岩心的实验评价效果。数字岩石物理学（DRP）可以很好地解决这些问题。本文基于实验室实验，提出了一种快速，简单，实用的方法来建立DRP的孔隙结构和岩性。首先，使用计算机断层扫描（CT）扫描技术扫描核心，然后使用滤波反投影重建方法测试核心的可视化效果。随后，使用三维中值滤波技术消除扫描后的噪声信号，用最大类间方差法分割岩石骨架和孔隙。基于X射线衍射技术，结合处理后的CT扫描数据，研究了岩心中矿物的分布。通过压汞法分析了岩心的孔径分布，利用克里格插值法构造了具有空间相关性的岩心的孔径分布。在通过筛选方法分析岩心粒径分布的基础上，假定岩石颗粒的形状为更实用的不规则多面体。考虑到这种形状和矿物分布，最终确定了DRP的孔隙结构和岩性。用MATLAB软件计算出的DRP孔隙率为32.4％，在核磁共振实验中测得的岩心孔隙率为29.9％；因此，模型的准确性得到验证。此外，提出了使用数字核模拟物理和化学变化过程的方法，以供进一步研究。