摘要
克拉玛依油田七西区三叠系下克拉玛依组(简称克下组)油藏开发面临单井产量衰减快、含水高,水驱开发效果差的难题,剩余油分布规律不明确,需要加强目的储层微观非均质性评价。利用岩心观察、薄片分析等研究手段,对储层岩石学及储集特征进行分析;以压汞实验分析为基础,利用“主要流动空间”和“分形维数”分别从“量”和“形”的角度关注目的储层孔隙结构非均质性程度,定量表征储层微观非均质性。结果表明:克下组储层岩性以砂砾岩为主,储集空间类型多样,以剩余粒间孔为主,储层以低孔特低渗为主。“主要流动空间”反映渗流能力贡献率为95%的主要流动空间仅占整体储集空间的不到33%;受微裂缝影响,“分形维数”分布于2.6~2.7的样品孔隙结构相对较好,整体反映出储层孔隙结构非均质性很强,利用上述两个参数对储层微观非均质性进行合理评价,为后续高效开发提供地质依据。
There are many problems exist in development stage of reservoir in Triassic Lower Karamay(Kexia Formation for short)in Qixi region of Karamay oilfield,such as reduction on single well production,higher water content and distribution of remaining oil is uncertainty,all of which need detailed evaluation on micro-heterogeneity.Lithology and reserve characters were searched through core observation and slice analysis.Based on mercury experiment,pore structure heterogeneity was searched by parameters of main flowing space and fractal dimension,which described heterogeneity on pore structure from the viewpoint of quantity and shape,and made quantitative evaluation on micro-heterogeneity of reservoir.The results show reservoir lithology of Kexia Formation is mainly conglomerate,and reserve space types are various,which is mainly residual intergranular pores,and reservoir is low porosity and extra-low permeability.The average of main flowing space percentage in reservoir of Kexia Formation is less than 33%.Fractal dimension of samples distributes from 2.6 to 2.7 have better pore structure.All of which reflect pore structure of reservoir has strong heterogeneity,and the two parameters make rational evaluation on micro-heterogeneity of reservoirs,which supply geological basis for effective development.
作者
冯利娟
钱川川
李勇
瞿利明
张磊
李澳
于景维
FENG Li-juan;QIAN Chuan-chuan;LI Yong;QU Li-ming;ZHANG Lei;LI Ao;YU Jing-wei(Development and Exploration Institute in Xinjiang Oilfield,Karamay 834000,China;Petroleum Institute in China University of Petroleum(Beijing)at Karamay,Karamay 834000,China)
出处
《科学技术与工程》
北大核心
2023年第16期6792-6801,共10页
Science Technology and Engineering
基金
新疆维吾尔自治区科技厅面上基金(2021D01A201)
克拉玛依市科技局人才创新项目(20212022hjcxrc0015)。
关键词
主要流动空间
分形维数
定量评价
储层非均质性
克下组
main flowing space
fractal dimension
quantity evaluation
reservoir heterogeneity
Kexia Formation
