摘要
针对吉木萨尔凹陷芦草沟组页岩油储集层岩性岩相复杂且相应物性特征不明,对研究区多口钻井岩芯样品的岩石学、孔隙特征与储集物性进行了综合研究。结果表明,芦草沟组是典型的混积岩地层,以泥级碎屑与云质混积岩为主,矿物以白云石、石英与斜长石为主。甜点位层属于浅湖-半深湖亚相湖泥微相与滩坝微相,以及少量前三角洲亚相地层,在垂向剖面频繁出现不同生储组合。上甜点储层岩石孔隙主要为粒间孔与粒间溶孔,下甜点则是以粒间溶孔为主。孔隙发育受粒径及成岩作用影响,以微细孔喉为主,孔渗性主要由纳米级孔喉控制。页岩油的富集程度明显受到储集层物性的限制,建议开发时采取相应的储层改造方案。
In view of the complex lithology and lithofacies of the shale oil reservoir of Lucaogou Formation in Jimusar sag and the unknown corresponding physical properties,a comprehensive study on the petrology,pore characteristics and reservoir physical properties of multiple drilling core samples in the study area was carried out.The results show that the Lucaogou Formation is a typical migmatite formation,which is mainly composed of argillaceous clastic and cloud migmatite,and the minerals are mainly composed of dolomite,quartz and plagioclase.The sweet spot layer belongs to the shallow lake-semi-deep lake subfacies lacustrine microfacies and beach bar microfacies,as well as a small number of pre-delta subfacies,and different source-reservoir assemblages frequently appear in vertical sections.The pores of the reservoir rocks are mainly intergranular pores and intergranular dissolved pores in the upper sweet spot area and are mainly intergranular dissolved pores in the lower sweet spot area.The pore development is affected by particle size and diagenesis,mainly micro pore throat,and the porosity and permeability are mainly controlled by nano pore throat.The enrichment degree of shale oil is obviously limited by the physical properties of the reservoir.Thus,it is suggested that the corresponding reservoir reconstruction plan during the development is adoptd.
作者
李杰
邓孙华
坎尼扎提
张旭
孙江河
顾晶晶
贺文同
LI Jie;DENG Sunhua;KANNI Zhati;ZHANG Xu;SUN Jianghe;GU Jingjing;HE Wentong(Research Institute of Technology,Xinjiang Oilfield Company,Karamay 834000,Xinjiang,China;College of Construction Engineering,Jilin University,Changchun 130026,China;College of Earth Sciences,Jilin University,Changchun 130061,China)
出处
《世界地质》
CAS
2021年第4期881-888,914,共9页
World Geology
基金
新疆油田公司技术咨询项目(2120K003001202)。
