缝洞型油藏离散数值试井与注水优化研究

塔河油田油藏属古岩溶缝洞型碳酸盐岩油藏，非均质性强，储集体空间分布具有不连续性。裂缝是主要的渗流通道，将溶 洞连通，而流体又主要储存在溶洞中，储层中流体流动复杂。传统试井解释方法难以正确描述储层特征和流体流动规律，针对缝 洞型油藏地质特征，把储层视为离散介质进行处理，建立了离散介质数值试井解释方法，解释结果更符合缝洞型储层的真实地 质特征，能更好地描述缝洞型油藏结构。根据离散数值试井分析与地质认识结合，划分出塔河油田碳酸盐岩5种典型油藏类型 和解释溶洞大小、溶洞距离等关键油藏参数，试井解释成果能有效指导注水井优选、注水参数优化及配套生产措施制定，对碳酸 盐岩缝洞型油藏提高采收率具有重要意义。

Discrete numerical well test and water injection optimization of fracture-cave type reservoirs

The carbonate oil reservoirs in the Tahe Oilfield belong to ancient karst fracture-cave type reservoirs. It has strongly heterogeneous characteristics and its space distribution is not continuous. The cracks which connect caves are the primary seepage channel and the fluid is mainly stored in the caves, so complex fluid flows lie in the reservoir. The traditional well test methods are hard to correctly describe fracture-cave type reservoir characteristics and fluid flow law. In view of the geologic features of fracture-cave type reservoirs, we regard reservoir as discrete media and set up a discrete numerical well test interpretation method. The results show that interpretations are more in line with the true fracture-cave reservoir geological features, and can better describe fracture-cave reservoir structure. According to the discrete numerical well test analysis combined with geological features, the paper divides carbonate oil reservoirs in the Tahe Oilfield into five typical reservoir types and explains cave sizes, distances and other key reservoir parameters. Well test interpretation results can effectively guide the injection wells optimization, injection parameter optimization and other supporting measures for production. It has an important significance for EOR of fracture-cave type reservoirs.