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岩体开采变形对流体渗流性质的影响是煤瓦斯共采、油气资源开发、CO2地质封存及地下水资源保护等关注的重要问题.本文基于砂岩孔隙结构CT图像,发展了一种孔隙岩石CH4微细观渗流的LBM模拟方法及适合于大尺度孔隙模型的并行算法,运用此方法模拟分析了孔隙砂岩CH4微细观渗流性质及孔隙结构特征的影响,并与实验结果进行对比,验证了LBM方法的可靠性.利用LBM+FEM方法分析了应力作用下孔隙结构变形对CH4渗流的影响机制.结果表明:该方法可以直观定量地描述岩石微细观孔隙结构特征、渗流速度场空间分布、渗透率以及应力作用下孔隙结构变形对渗流速度场、有效孔隙度和渗透率的影响.不同孔隙度砂岩渗透率的LBM计算结果与实验值具有较好的一致性.
The influence of deformation of rock mass on fluid seepage properties is an important issue concerned with the common mining of coal gas, development of oil and gas resources, geological storage of CO2 and protection of groundwater resources etc. Based on CT images of sandstone pore structure, a microcosm of CH4 The LBM simulation method of seepage flow and the parallel algorithm suitable for large-scale pore model are used to simulate and analyze the seepage properties of CH4 and the pore structure characteristics of porous sandstone. The reliability of the LBM method is verified by comparison with the experimental results The influence mechanism of pore structure deformation on CH4 seepage was analyzed by LBM + FEM method.The results show that the method can directly and quantitatively describe the microscopic pore structure characteristics, the spatial distribution of permeability velocity field, permeability and stress The effect of pore structure deformation on seepage velocity field, effective porosity and permeability is studied.The LBM results of permeability of different porosity sandstone have good agreement with experimental values.