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针对碳酸盐岩油藏孔隙大小的双峰分布特征,首先利用计算机模拟建立了描述不同孔隙特征的大孔隙网络模型和微孔隙网络模型,在此基础上提出一种耦合算法构建出的同时描述大孔隙和微孔隙特征的碳酸盐岩双孔隙网络模型;然后,基于侵入-逾渗理论,模拟双孔隙网络模型中油水两相流体的一次驱替和二次吸吮过程,并建立了毛细管压力和相对渗透率的求解模型;最后,通过调整双孔隙网络结构参数,模拟水湿油藏条件下碳酸盐岩储层参数对相对渗透率曲线的影响.结果表明,随着微孔隙比例因子和平均配位数的增加,油相相对渗透率曲线升高;随着双孔隙半径比的增加,油相和水相相对渗透率曲线下降,这对碳酸盐岩油藏渗流机理研究有着重要的指导意义.
Aiming at the bimodal distribution of pore size in carbonate reservoirs, a macropore network model and a micropore network model describing different pore characteristics were first established by computer simulation. Based on this, a simultaneous description Macropore and micropore characteristics of carbonates. Then, based on the theory of invasion-percolation, the primary displacement and secondary sucking of oil-water two-phase fluid in the two-porosity network model are simulated and the capillary pressure And the relative permeability model.Finally, by adjusting the parameters of the dual-porosity network, the influence of carbonate reservoir parameters on the relative permeability curve under simulated wet-water reservoir conditions was simulated.The results show that with the increase of the microporosity ratio and With the increase of average coordination number, the relative permeability curve of oil phase increased. With the increase of the ratio of the two pores, the relative permeability curve of oil phase and water phase decreased, which was of great importance for the study of seepage mechanism of carbonate reservoir Guiding significance.