延长油田吴起地区富县组储层特征及敏感性研究  

Research on the characteristics and sensitivity of the Fuxian formation reservoir in the Wuqi area of Yanchang oilfield

作　　者：席萌 苏帆 宁涛 蔺广泉 白喜军 XI Meng;SU Fan;NING Tao;LIN Guangquan;BAI Xijun(Yanchang Oilfield Water Injection Project Area Management Command Post,Yan'anShaanxi 716000,China;Yanchang Oilfield Subsurface Operation Engineering Company,Yan'an Shaanxi 716000,China;Yanchang Oilfield Zhidan OilExtraction Plant,Yan'an Shaanxi 717500,China)

机构地区：[1]延长油田注水项目区管理指挥部,陕西延安716000 [2]延长油田井下作业工程公司,陕西延安716000 [3]延长油田志丹采油厂,陕西延安717500

出　　处：《石油化工应用》2024年第12期68-75,98,共9页Petrochemical Industry Application

摘　　要：近年来,在油田开发过程中陆续在西部地区发现一部分富县组低阻油藏,投产产量高,开发效果良好。为进一步提升吴起地区富县组油藏的开发效果,掌握储层的基本特征,填补储层敏感性研究的空白,强化储层保护工作,指导后续挖潜调整。本次利用岩心驱替、铸体薄片鉴定、高压压汞、XRD矿物定量分析及扫描电镜技术,从岩石学特征、物性特征、孔喉配套发育特征及孔隙结构特征等方面开展研究区储层特征表征及敏感性研究。结果表明,富县组储层主要岩石类型为中细粒岩屑长石砂岩;孔隙度为6.0%~18.0%,平均为12.9%,主要分布区间为10.0%~16.0%,占总数的近79.2%;储层渗透率为(0.01~62.80)×10^(-3)μm^(2),平均值为8.26×10^(-3)μm^(2),主要分布区间为(0.30~80.00)×10^(-3)μm^(2),占总数的近87.5%,属于低孔低渗透储层。储层敏感性分析认为具有强速敏、弱水敏、弱盐敏、强酸敏、中等偏弱-弱碱敏。研究结果为吴起地区富县组储层保护及制定科学合理的油藏开发政策提供了重要依据。In recent years,a number of low-resistance oil reservoirs within the Fuxian formation have been discovered successively in the western region during the development of oilfields.These reservoirs have demonstrated high initial production rates and favorable development outcomes.To further enhance the development of the Fuxian formation oil reservoirs in the Wuqi area,it is necessary to understand the basic characteristics of the reservoirs,fill the research gap in reservoir sensitivity,strengthen reservoir protection efforts,and guide subsequent potential adjustments.In this study,rock core displacement,cast thin section identification,high pressure mercury,XRD mineral quantitative analysis and scanning electron microscopy technology were used to characterize and study the reservoir characteristics of the research area from aspects such as lithological characteristics,physical properties,pore throat development characteristics and pore structure characteristics.The results indicate that the main rock types of the Fuxian formation reservoirs are medium-fine-grained lithic feldspathic sandstone.The porosity ranges from 6.0%~18.0%,with an average of 12.9%,and the main distribution interval is 10.0%~16.0%,accounting for nearly 79.2%of the total.The reservoir permeability ranges from(0.01~62.80)×10^(-3)μm^(2),with an average of 8.26×10^(-3)μm^(2),and the main distribution interval is(0.30~80.00)×10^(-3)μm^(2),accounting for nearly 87.5%of the total,which is classified as a low-porosity and low-permeability reservoir.The reservoir sensitivity analysis suggests strong velocity sensitivity,weak water sensitivity,weak salt sensitivity,strong acid sensitivity,and moderate to weak alkali sensitivity.The research findings provide an important basis for the protection of the Fuxian formation reservoirs in the Wuqi area and the formulation of scientific and reasonable oil reservoir development policies.

关 键 词：富县油层组 低渗储层 储层特征 储层敏感性 

分 类 号：TE122.23[石油与天然气工程—油气勘探]