沾化凹陷罗家地区沙三段下亚段页岩岩石学特征  

Lithologic characteristics of Lower Es3 shale in Luojia area,Zhanhua sag

作　　者：刘惠民[1] 张守鹏[1] 王朴[1] 王伟庆[1] 朱日房[1] 刘洪营[1] 

机构地区：[1]中国石化股份胜利油田分公司地质科学研究院,山东东营257015

出　　处：《油气地质与采收率》2012年第6期11-15,111-112,共5页Petroleum Geology and Recovery Efficiency

基　　金：中国石化科研攻关项目"济阳坳陷页岩油富集条件与有利区预测"(P12062)

摘　　要：沾化凹陷罗家地区沙三段下亚段页岩油气资源丰富,针对这类结构细、孔隙小的页岩类非常规储层,首次采用岩心观察—薄片鉴定—电镜分析—荧光观察综合分析方法,对该区沙三段下亚段页岩岩石学特征进行了系统研究,进而划分岩相类型、明确储集空间并结合物性测试资料落实储集性能。结果表明:罗家地区沙三段下亚段富含方解石,随着层位变老,方解石含量呈增加趋势,粘土矿物和陆源碎屑含量呈降低趋势;岩石类型以泥质灰岩为主,其次为灰质泥岩、含泥质灰岩;岩相类型以层状泥质灰岩相、纹层状泥质灰岩相为主,其次为层状灰质泥岩相、层状含泥质灰岩相,其中纹层状泥质灰岩为有利岩相;储集空间主要为各类微裂缝及方解石、粘土矿物晶间微孔;孔隙度主要为2%～8%,渗透率变化很大,主要为1×10-3～10×10-3μm2,其次为0.1×10-3～1×10-3μm2。The Lower Es3 shale of Zhanhua sag is considered as good source rock and storing hydrocarbon,and its lithologic charac teristics is entirely studied in this paper.On the comprehensive analysis of the core observation,thin section identification,SEM analysis and fluorescence reaction features,the lithologic type is classified and reservoir space is identified.The reservoir property is studied with reservoir space identification and core measurement of porosity & permeability.The research shows that:①the shale is rich in calcite,with the depth getting deeper,the calcite content is increasing,clay minerals and quartz contents are decreasing;② the laminated argillaceous limestone is the dominant lithologic type,and the first-rate type is composed of recrystalized calcite and clayey lamina;③the reservoir space is consisted mostly by micro-fracture,intercrystal micropore of calcite and clay minerals;④ the porosity is predominantly ranged in 2%-8% and permeability 0.1×10-3-10×10-3μm2 。

关 键 词：页岩油气岩石学特征沙三段下亚段罗家地区沾化凹陷 

分 类 号：TE111.3[石油与天然气工程—油气勘探]