基于微米焦点CT技术的煤岩数字岩石物理分析方法——以沁水盆地伯方3号煤为例

数字岩石物理技术既可实现煤体孔隙的三维空间表征及重构，又可模拟孔裂隙系统中流体的流动和绝对渗透率的计算。以伯方矿3号煤层为研究对象，基于微米焦点CT扫描与图像处理技术相结合，建立了真实的三维数字岩心模型；应用MATLAB编程及AVIZO软件内含的多种形态学算法，进行了数字岩心孔隙结构量化和表征，建立了等价孔隙网络模型；将AVIZO与COMSOL完美对接，实现了孔隙尺度的渗流模拟、绝对渗透率计算，并探讨了流体运移过程中的压力场及速度场的分布。研究方法丰富了现有数字岩石物理研究手段，为微观尺度上的煤体孔隙结构及流体运移研究提供了一种新的途径。

Study of digital petrophysical analysis method based on micro-focus X-ray tomography: A case study from No.3 coal seam of Bofang mining area in southern Qinshui basin

The successful application of digital rock-physical technology can not only realize the 3D spatial representation and reconstruction of pores, but also achieve the flow simulation of fluid and the comparative study of absolute permeability. Taking No.3 coal seam in Bofang mine area as the research object, in the study, a 3D digital core model was established based on micro-focus X-ray CT and image processing technology. The quantification and characterization study of the pore structure was carried out by using programming in MATLAB and various morphological algorithms contained in AVIZO, and the equivalent pore network model was established. With the perfect docking of AVIZO and COMSOL, the seepage simulation and the absolute permeability calculation in the micro-scale were realized, and the distribution of pressure field and velocity field in the process of fluid migration was discussed. The method of combining AVIZO with COMSOL enriches the research methods of rock-physical technology, which can provide a new way for studying the pore structure and fluid migration in the micro-scale.