基于构型级次的曲流河剩余油模式及挖潜措施
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摘要
孤东油田七区西主力油层Ng5~(2+3)段为典型的曲流河沉积,经历30多年的开发,已进入特高含水期产量递减采油阶段,剩余油呈现总体分散、局部集中的特点。在油层相对稳定的情况下,储层砂体内部结构以及注采关系对剩余油的形成与分布具有明显的控制作用,综合岩心、测井、地震沉积学以及生产测试等资料,从不同级次储层构型以及注采关系角度将研究区剩余油分布模式总结为顶部滞留型、注采受效低型、物性遮挡型、层内干扰型、注采失效型以及平面干扰型。并在单井分析基础上提出了加密水平井、整体提液、上返层位等调整措施,改善开发效果。
Major Oil Layer Ng5~(2 + 3) in West Block 7 of Gudong Oilfield is typical meandering river deposition. After 30 years of development,the area has entered into the stage of high water cut and production decline,which is characterized by the general dispersion and local concentration for the remained oil. In the case of relatively stable reservoirs,the internal structures of the reservoir sandbodies and the injection and production relationship have obvious control effects on the formation and distribution of the remained oil. Integrated with the core,well logging,seismic sedimentology,production test data and so forth,the remained oil distribution patterns in the study area were summarized as follows from the viewpoints of different-level reservoir architectures and the injection and production relationship: top retention type,low-efficiency injection type,physical property barrier type,inter-layer interference type,injection-production failure type and plane interference type. And on the basis of the individualwell analysis,the following adjusting measures were put forward: infilling horizontal wells,increasing the liquid in a whole,upward returning to the layer and so on,thus the developed effects have been improved.
Major Oil Layer Ng5~(2 + 3) in West Block 7 of Gudong Oilfield is typical meandering river deposition. After 30 years of development,the area has entered into the stage of high water cut and production decline,which is characterized by the general dispersion and local concentration for the remained oil. In the case of relatively stable reservoirs,the internal structures of the reservoir sandbodies and the injection and production relationship have obvious control effects on the formation and distribution of the remained oil. Integrated with the core,well logging,seismic sedimentology,production test data and so forth,the remained oil distribution patterns in the study area were summarized as follows from the viewpoints of different-level reservoir architectures and the injection and production relationship: top retention type,low-efficiency injection type,physical property barrier type,inter-layer interference type,injection-production failure type and plane interference type. And on the basis of the individualwell analysis,the following adjusting measures were put forward: infilling horizontal wells,increasing the liquid in a whole,upward returning to the layer and so on,thus the developed effects have been improved.
引文
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[3]于欢.辫状河储层内部构型精细描述及剩余油分布[J].大庆石油地质与开发,2015,34(4):73-77.
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[7]赵萍.特高含水期同步周期注采现场试验效果[J].大庆石油地质与开发,2010,29(4):98-101.
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