To date, the modeling method of point bar internal architecture has still not been fully developed. Traditional methods for point bar architecture modeling usually require a finer mesh, which is more expensive computationally, and upscaling the model can possibly generate a misleading model. The above restricts the industrial application of the architecture model to just oilfield development. Therefore, this paper explores and develops a hierarchical modeling method based on multilevel architecture interface constraints. This method attempts to introduce the surface-based method into the lateral accretion layer modeling of the point bars, and encapsulates and combines the top and bottom surfaces of different architecture elements as their spatial stack sequence to provide convenience for the subsequent model upscaling. During the modeling process, by using the nonuniform grid technology, different grid densities were implemented for the lateral accretion layer and lateral accretion body respectively to achieve the upscaling and simplification of the grid; In order to smooth the simulation and improve the convergence of the model, two grid orthogonalization correction schemes have also been proposed. Finally, the composite point bar sand body model can be formed by splicing and assembling different single-point bar with the hierarchical modeling method. This method has been validated in the B layer of M oilfield, which deposits the meandering river environment. Compared with older models, the new one can represent the 3D shape and physical properties of the underground architecture with a smaller number of grids. Due to the reasonable number and approximate orthogonal type of the grid, this model has a faster calculation speed and better convergence in the numerical simulation process. The simulation results show that in the oilfield development process, injected water will not spread in the traditional way, but is more affected by the architecture of the interface. In the vertical direction, the injected water flows along the bottom of the channel, and the residual oil existed in the upper part of the reservoir; in the horizontal direction, the injected water flows along the extension direction of the lateral accretion layer, and residual oil exists in the area of imperfect injection-production pattern. The above research can help us evaluate the reservoir better, and provide a specific guidance for adjustment and tapping the potential of residual oil and water-flooding optimization in a fluvial reservoir.

迄今为止，点栏内部体系结构的建模方法仍未完全开发。传统的点杆架构建模方法通常需要更细的网格，这在计算上会更加昂贵，并且放大模型可能会产生误导性的模型。以上将架构模型的工业应用限制为仅油田开发。因此，本文探索并开发了一种基于多级体系结构接口约束的分层建模方法。该方法试图将基于表面的方法引入点杆的横向积聚层建模中，并将不同建筑元素的顶面和底面封装并组合为空间堆叠顺序，从而为后续的模型放大提供便利。在建模过程中，通过采用非均匀网格技术，分别在横向吸积层和横向吸积体上实现了不同的网格密度，以实现网格的放大和简化。为了平滑仿真并提高模型的收敛性，还提出了两种网格正交校正方案。最后，通过分层建模的方法，将不同的单点钢筋进行拼接和组装，可以形成复合点钢筋砂体模型。该方法已在M油田B层中得到验证，该B层沉积了蜿蜒的河流环境。与旧模型相比，新模型可以用较少的网格表示地下建筑的3D形状和物理属性。由于网格的数量合理且近似正交，该模型在数值模拟过程中具有更快的计算速度和更好的收敛性。仿真结果表明，在油田开发过程中，注入水不会以传统方式扩散，而受界面结构的影响更大。在垂直方向上，注入的水沿通道底部流动，剩余油存在于储层上部。在水平方向上，注入的水沿着横向吸积层的延伸方向流动，并且残留的油存在于注入生产模式不完善的区域。上述研究可以帮助我们更好地评估储层，并为调节和开发河流储层中剩余油和注水优化的潜力提供具体指导。