胜利油区碎屑岩纳米尺度孔隙结构特征

选取胜利油区的3个不同油田取样分析资料,在储层微观孔隙结构研究的基础上通过扫描电镜、透射电镜以及原子力显微镜对储层中纳米尺度的孔隙结构和孔喉配置关系进行研究。结果表明:碎屑岩储层中存在纳米级的孔隙和喉道,且孔隙类型多样,同样可分为原生孔隙和次生孔隙两大类;纳米级原生孔隙包括单晶片层间缝、矿物解理缝、晶内孔、粒间孔和晶间缝5种类型,纳米级次生孔隙包括粒内溶孔、溶蚀缝、构造缝;研究区纳米尺度下的孔喉配置关系归结为孔喉一致型、弯曲沙漏型、"X"形孔喉交叉型、"丰"字形孔隙交叉型和杯形交叉缝型5种类型。

Nanoscale pore structure characteristics of clastic rock in Shengli Oilfield

The analysis samples were taken from three different oilfields in Shengli Oilfield.By using high magnification scanning electron microscopy(SEM),transmission electron microscopy(TEM)and atomic force microscopy(AFM),the research of nanoscale observation and analysis of reservoir pore structure and pore-throat configuration relationships were conducted based on the investigation of reservoir micro-structures.The results show that the nanoscale pore and throat really exist in clastic reservoir and there are various pore types,and they can also be divided into primary pores and secondary pores.The nanoscale primary pores include five types,that is,single crystal layer seams,mineral cleavage joints,intracrystalline pores,intergranular pores and intercrystalline joints.The nanoscale secondary pores include intragranular dissolved pores,dissolution joints and construction joints.In research area,five types of nanoscale pore-throat configuration relationships are established,that is,pore-throat consistent type,curved hourglass type,"X"-shaped pore cross type,"丰"-shaped pore cross type and goblet-shaped cross joint type.