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双重孔隙介质是具有双重孔隙度、双重渗透率,形成两个平行水动力学场,流体相互之间按一定规律和方式窜流交换等特性的孔隙介质系统。哥伦比亚Capella油田Cong层储层以砾岩为主,岩性致密,属低孔低渗储层,具有双重介质的特征。在Cong层地质建模过程中,在构造模型基础上,采用井震结合的方法约束油藏属性模型;在裂缝建模过程中,应用面密度计算裂缝密度曲线并得到裂缝密度体模型,并采用基于目标算法模拟裂缝三维模型。在模拟裂缝模型过程中将小尺度缝进行分组,减少了倾向、倾角、长度的统计方差,提高了模拟精度。以达西定律和物质平衡方程为基础,按照模拟单元把复杂的裂缝实际模型转化为由三组相互正交的裂缝组组成的裂缝块模型,得到Cong裂缝渗透率模型,模型渗透率与试井解释的油藏动态渗透率相一致。该模型可应用于油藏数值模拟并指导油藏开发调整。
The dual-porosity media is a porous media system with dual porosity, dual permeability, two parallel hydrodynamic fields, fluid-to-fluid exchange and other characteristics. The Cong layer of Capella oilfield in Colombia is mainly conglomerate with dense lithology. It belongs to low-porosity and low-permeability reservoirs and has dual media characteristics. In the process of ge layer geological modeling, based on the structural model, the reservoir property model is constrained by the combination of well and seismic; in the process of fracture modeling, the crack density curve is calculated by using areal density and the fracture density model is obtained, Simulation of crack 3D model based on target algorithm. In the process of simulating the fracture model, small-scale slits are grouped to reduce the statistical variance of inclination, inclination and length, and improve the simulation accuracy. Based on the Darcy’s law and the material balance equation, the actual fracture model is transformed into a fracture block model composed of three groups of fracture groups that are orthogonal to each other according to the simulation unit to obtain the permeability model of the Cong fracture. The model permeability and well test Interpretation of the reservoir dynamic permeability consistent. The model can be applied to reservoir numerical simulation and guide the reservoir development and adjustment.