摘要
利用岩心物性分析、压汞曲线和镜下分析等资料,研究榆树林油田东16区块扶杨油层的宏、微观特征及二者关系.结果表明:研究区扶杨油层岩性为岩屑长石砂岩,普遍具有碎裂特征,主要孔隙成因类型包括微裂缝、粒间孔、粒内孔和晶间孔,微裂缝对孔隙度的贡献不大,但对渗透率的影响不容忽视.孔隙度主要受孔喉发育程度影响,孔喉半径越大,孔隙度越高.渗透率受反映连通程度的特征结构参数影响较大,二者呈正相关关系,且孔隙度越大,特征结构系数对渗透率的影响越大.退汞效率受特征结构参数影响较大,储层为中孔时,退汞效率随特征结构参数的增大而增大;储层为低孔或特低孔时,退汞效率随特征结构参数的增大而减小.该研究结果对改造低渗储层、提高采收率具有指导意义.
The influence of microscopic features on the macroscopic properties such as permeability,porous and oil displacement efficiency in low permeability reservoir is much more complex than in conventional reservoir.Understanding the microscopic features and its influence law to macroscopic properties in low permeability reservoir is key to reform low permeability reservoir.In this paper,the microscopic and macroscopic features and their relationship of reservoir in Dong16 Block of Yushulin Oilfield is studied with the data of scanning electron microscopy,thin section,intrusive mercury curve and materials of porosity and permeability.Studies suggest that the reservoir of Fu Yu and Yang is mainly lithic feldspathic.In general it possess the features of fragmentation,the main pore types including micro cracks,intergranular dissolution pore between the grain and in the grain,although the contribution of micro-cracks to porosity is not big,but its influence to permeability cannot be ignored.Porosity mainly effect by the development degree of pore throat,the bigger radius of pore throat are,the porosity is higher.The permeability is affect by significant parameters which reflect the characteristics of connectivity,it showed a positive correlation between them,and the greater the porosity,the influence of permeability to significant parameters is bigger.Mercury efficiency is also influenced by significant parameters,Mercury efficiency increased with the significant parameters in middle pores,but Mercury efficiency decreased with the significant parameters in low and extra-low pores.The study result has guiding significance for reconstructing low permeability and improves oil recovery.
出处
《东北石油大学学报》
CAS
北大核心
2012年第4期30-36,5-6,共7页
Journal of Northeast Petroleum University
基金
黑龙江省教育厅科学技术研究指导项目(11555024)
关键词
低渗透
孔隙结构
微裂缝
特征结构参数
榆树林油田
low permeability
pore structure characteristics
micro cracks
significant parameters
Yushulin oilfield
