直罗油田北部延安组延9段储层特征

通过岩心观察、岩石薄片鉴定、扫描电镜、压汞试验等测试技术,对直罗油田延安组延9段储层特征及其非均质性进行了研究,结果表明,延9段岩石类型主要为灰色、灰绿色、灰褐色长石岩屑质石英砂岩,砂岩的分选中等~好,磨圆度多为次圆、次棱~次圆状;颗粒之间以线、点–线接触为主,局部可见点接触和凹凸接触,多为颗粒支撑;孔隙类型主要包括粒间溶孔、粒内溶孔、剩余粒间孔和铸模孔,孔喉结构为中孔中喉型和中小孔细喉型;延9段属于中孔隙度、中–低渗透率储层,储层物性较好。

Reservoir characteristics of Yan 9 member of the Yan'an formation in the north of Zhiluo oilfield

By using experimental testing techniques such as core observation,rock slices identification,scanning electron microscopy and pressure mercury test,the characteristics and heterogeneity in Yan'an reservoir was studied.The results indicate the rock types of the Yan 9 member are mainly gray,gray-green,gray-brown feldspar lithic quartz sandstone,the sorting of sandstone is medium-good,roundness is mostly round,secondary edge-sub-round.Particles are between the line,pointline contact,point contact and bump contact can be partially seen,mostly for particle support.From the capillary pressure curve,it can be seen:the pore type of Yan 9 is medium hole-throat type,medium and small hole type.The reservoir types in Yan'an formation include the following four types,namely intergranular dissolution,intergranular dissolution,residual intergranular pores and casting holes.Among them,79.23% of the intergranular pores are the largest,0.63% of the casting holes is the least.The reservoir of Yan 9 member belongs to medium porosity,medium-low permeability reservoirs,and the reservoirs have good physical properties.