缝洞型油藏剩余油分布模式及挖潜对策

Remaining Oil Distribution Patterns and Recovery Measures in Fracture-Cave Oil Reservoir

为研究塔河2区缝洞型碳酸盐岩油藏剩余油分布情况,依据实际开发状况,结合静态地质资料和动态开发资料,在储集体类型的基础上对剩余油进行分类,提出了塔河2区缝洞型碳酸盐岩油藏3个大类9个亚类剩余油分布模式:岩溶管道型剩余油包括支流管道型、管道末端型、管道局部高部位型、管道侧壁型、管道附近孔缝型以及致密层遮挡型6个亚类;残丘型剩余油包括阁楼型和低幅残丘型2个亚类;断控岩溶型剩余油包括断裂附近孔缝型1个亚类。针对不同类型的剩余油分布模式,分别提出了新井加密、酸化压裂、钻塞下返、排水采油、提液、注水、单井注气及单元注气等挖潜措施,为塔河2区开发方案的调整提供了一定依据。

In order to identify the remaining oil distribution of fracture-cave carbonate oil reservoir in Zone-2 of Tahe Oilfield,the remaining oil distribution is classified by considering field development performance,static geology,production performance and reservoir types. 3-category remaining oil distribution patterns with 9 subcategories are proposed for fracture-cave carbonate oil reservoir in Zone-2 of Tahe Oilfield. Karst pipeline distribution pattern includes 6 subcategories,namely branch-pipeline,pipeline end,local high parts of pipeline,pipeline sidewall,pore-fracture near pipeline and tight layer shielding. Monadnock distribution pattern include 2 subcategories,namely loft-type and low-amplitude monadnock. Fault-controlled karst distribution pattern includes 1 subcategory,namely pore-fracture near rupture. New well infilling,acid fracturing,drilling plug return,oil recovery by water drainage,liquid extraction,water injection,single-well gas injection,unit gas injection and other remaining oil recovery measures are respectively proposed for different remaining oil distribution patterns,which could provide certain references for the development program adjustment of Zone-2 in Tahe Oilfield.