基于演化博弈优化算法的油藏层段划分方法

Reservoir Segment Division Method Based on Evolutionary Game Optimization Algorithm

  • 摘要: 复杂油藏层间非均质性强、多目标冲突突出,导致传统层段划分方案难以实现注采均衡和高效开发。首先,本文以某实际油藏为研究对象,在多维工艺准则的严格约束下,以最小化层内非均质性指标为优化目标,构建了多约束多目标油藏层段划分模型;其次,针对层段划分模型可行域极窄以及传统算法静态资源分配效率低下的问题,提出一种演化博弈驱动的约束多目标优化算法。该算法通过引入可行成熟度与复制动态方程,实现了探索、开发与多样性保持策略间的收益驱动与资源自适应分配,显著增强了算法在复杂约束条件下的优化能力、收敛性能与多样性维持能力;最后,将所提算法对模型进行求解,实验结果表明所提算法生成的优化方案使渗透率变异系数平均下降约54%,含水率差异降低超过85%,渗流阻力变异系数下降约52%。优化方案使层内非均质性指标显著降低,层间协调性与注采对应关系得到明显改善。为复杂油藏精细开发和剩余油高效挖潜提供了很好的技术支撑。

     

    Abstract: Due to the strong heterogeneity between layers and the prominent multi-objective conflict in complex reservoirs, it is difficult to achieve balanced injection and production and efficient development with the traditional division scheme of layers. Firstly, taking an actual reservoir as the research object, a multi-constraint multi-objective reservoir segment partition model was constructed with the objective of minimizing the heterogeneity index within the layer under the strict constraints of multi-dimensional process criteria. Secondly, aiming at the problem that the feasible region of the layer division model is extremely narrow and the traditional algorithm has low efficiency of static resource allocation, an evolutionary game-driven constrained multi-objective optimization algorithm is proposed. By introducing feasible maturity and replication dynamic equation, the algorithm realized the revenue driving and adaptive resource allocation among exploration, exploitation and diversity maintenance strategies, which significantly enhanced the optimization ability, convergence performance and diversity maintenance ability of the algorithm under complex constraints. Finally, the proposed algorithm was used to solve the model. The experimental results show that the optimization scheme generated by the proposed algorithm reduces the coefficient of variation of permeability by about 54%, the difference of moisture content by more than 85%, and the coefficient of variation of seepage resistance by about 52%. The optimization scheme significantly reduces the heterogeneity index in the layer, and improves the relationship between the coordination and layers and the injection and production. It provides a good technical support for the fine development of complex reservoir and the efficient exploitation of remaining oil potential.

     

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