青平川油田长2储层特征及综合评价

在收集统计研究区大量资料的基础上,通过薄片鉴定、扫描电镜、压汞、物性测试的分析结果以及测井解释成果对研究区长2储层特征做了微观细致地研究,并结合多个影响储层好坏的因素对储层进行定量分类评价。研究结果表明:长2储层的岩石类型以长石砂岩为主,其次为岩屑质长石砂岩,孔隙空间主要被原生粒间孔(约占总空间的92%)所占据,长石溶孔和岩屑溶孔所占的孔隙空间体积较少;孔隙大小的分布较为均匀,中孔的数量所占比例最大,大孔和小孔所占的比例较小;长2储层连通孔隙的喉道非常细微,所需的排驱压力较高,且喉道大小的分布极为不均;研究区储层成岩作用强烈,成岩作用强度对储层储渗性能的好坏具有至关重要的影响,研究区主要为中等储层,发育少量好储层。

Characteristics and Comprehensive Evaluation of Chang 2 Reservoir in Qingpingchuan Oilfield

On the basis of collecting a large amount of data in the statistical research area,the microscopic study of the characteristics of the reservoir area 2 was carried out through thin section identification,scanning electron microscopy,mercury intrusion,physical property test analysis results and log interpretation results.The factors affecting the quality of the reservoir were quantitatively classified and evaluated.The results showed that the rock types of the Chang 2 reservoir are dominated by feldspar sandstone,followed by the lithic feldspar sandstone,and the pore space is mainly occupied by the primary intergranular pores (about 92% of the total space).The volume of pores occupied by pores and lithic pores is small;the distribution of pore size is relatively uniform,the proportion of mesopores is the largest,the proportion of macropores and pores is small;the length of long reservoirs is connected to pores.The throat is very fine,the required discharge pressure is high,and the distribution of throat size is extremely uneven;the diagenesis of the reservoir in the study area is strong,and the diagenesis intensity has a vital impact on the reservoir permeability.The study area is mainly medium reservoirs with a small number of good reservoirs.