缝洞型油藏井间三维连通路径多目标搜索算法设计

Multi-Objective Search for Three-Dimensional Connectivity Paths between Wells in Fractured-Vuggy Reservoirs

深层海相碳酸盐岩油气藏储集体类型复杂多样,非均质性强,井间连通关系评价困难.针对传统静动态方法主观性强、多解等问题,基于三层结构设计,采用地震多属性数据刻画不同类型储集空间,提出改进A^(*)算法搜索符合地质构造的井间连通路径,根据优化目标研究自适应交叉变异概率改进NSGAⅢ算法自动获取井间三维沟通路径,细致刻画静态连通情况.以塔河油田S80单元典型井组为研究对象,实验结果表明改进优化算法能有效提升多目标算法的全局搜索能力,自动搜索路径与地震资料分析、示踪剂测试情况基本吻合,能较好反映井间不同尺度缝洞空间配置关系,为缝洞型油藏注水开发阶段指导工作制度调整、提高采收率提供技术支撑.

The deep marine carbonate reservoirs have complex reservoir types and strong heterogeneity,so it′s difficult to evaluate the well connectivity.This paper designs a three-layer structure to address the subjectivity and multiple solutions problems about traditional static and dynamic inter-well connected evaluation methods.The improved A* algorithm is proposed to search for the inter-well connected paths by geological formations.The improved NSGA Ⅲ algorithm with self-applicable cross-variance probability according to the optimization objective is proposed to obtain three-dimensional multi-connected paths automatically which can carefully characterize the static connectivity.The experiment takes the S80 unit typical well group as the object in the TAHE oilfield.The results show that the adaptive cross-variance probability can effectively improve the multi-objective algorithm global search capability.The automatic search paths match with the seismic multi-attribute data analysis and tracer testing.Therefore,the algorithm can better reflect the spatial configuration relationship of fractures and cavities at different scales between wells.Furthermore,it can also provide technical support for adjusting the work system and improving the recovery in the field development of fractured-vuggy reservoirs in the water-injecting development stage.