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碳酸盐岩油藏非均质性强,孔隙大小变化可达好几个数量级,描述碳酸盐岩油藏多尺度孔隙特征具有重要意义。本文首先基于三维规则网络模型建立了不同物理尺寸的溶洞网络、大孔隙网络和微孔隙网络;然后提出一种耦合算法,以溶洞网络为基础,通过添加适当比例的大孔隙和微孔隙,构建出碳酸盐岩多尺度网络模型;最后对比分析了各网络模型的几何性质、拓扑性质和绝对渗透率。结果表明,碳酸盐岩多尺度网络模型能够同时描述不同尺度孔隙的几何和拓扑特征;且相比各单一尺度的孔隙网络模型,多尺度网络模型有着较高的绝对渗透率,这是由于各尺度孔隙之间的相互连通极大地提高了网络的整体连通性和流动能力,为碳酸盐岩油藏微观渗流模拟提供了重要的研究平台。
Carbonatite reservoirs are highly heterogeneous and can vary pore size by several orders of magnitude. It is of great significance to describe the multi-scale pore characteristics of carbonate reservoirs. In this paper, we first establish the cave-shaped network, the macroporous network and the microporous network with different physical sizes based on the three-dimensional regular network model. Then, we propose a coupling algorithm based on the cave network, by adding appropriate proportion of macropores and micropores, Carbonate multi-scale network model. Finally, the geometric properties, topological properties and absolute permeability of each network model are compared and analyzed. The results show that the multi-scale network model of carbonate rocks can simultaneously describe the geometrical and topological characteristics of pores at different scales. Compared with the single-scale pore network model, the multi-scale network model has a higher absolute permeability, because The interconnection of scale pores greatly improves the overall connectivity and fluidity of the network, providing an important research platform for micro-seepage simulation of carbonate reservoirs.