川东北地区侏罗系凉高山组页岩储层地质特征及页岩油气勘探潜力  

Geological characteristics of shale reservoirs and exploration potential of shale oil and gas in Jurassic Lianggaoshan Formation of northeastern Sichuan Basin

作　　者：张金旭 王有智[1,2] 陈绪强 祝斯淼 朱彦平 ZHANG Jinxu;WANG Youzhi;CHEN Xuqiang;ZHU Simiao;ZHU Yanping(Exploration and Development Research Institute of PetroChina Daqing Oilfield Co.,Ltd.,Daqing 163712,China;State Key Laboratory of Continental Shale Oil,Daqing 163712,China)

机构地区：[1]中国石油大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [2]多资源协同陆相页岩油绿色开采全国重点实验室,黑龙江大庆163712

出　　处：《大庆石油地质与开发》2025年第2期38-49,共12页Petroleum Geology & Oilfield Development in Daqing

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目“四川盆地大庆探区侏罗系陆相页岩油富集机理与关键评价技术研究”(2022DJ1809);黑龙江省“百千万”工程科技重大专项“松辽盆地北部古龙页岩油成藏条件及甜点分布规律研究”(SC2020ZX05A0023)。

摘　　要：川东北地区凉高山组页岩储层矿物组分复杂,明确页岩储集层有机地球化学、矿物组成等基础地质特征,有助于页岩油甜点评价及有利区优选。优选凉高山组页岩储集层样品,利用全岩X射线衍射(XRD)、场发射扫描电镜、低温氮气吸附、高压压汞、核磁共振和激光共聚焦等实验手段,揭示了页岩储集层的矿物组成、微观孔隙结构、含油性与可动性等基础地质特征并探讨了页岩油的勘探潜力。结果表明:川东北地区凉高山组页岩主要由石英和黏土矿物组成,烃源岩品质好,具备高产的地质基础;储集空间以粒间孔、粒内孔和有机质孔为主;页岩中见原油在长英质粒间孔内呈簇状富集,沿页理缝呈线性富集,在基质孔隙内呈零散状分布,轻重组分分离现象较为明显;利用核磁离心法计算得到凉高山组可动油量为0.80~3.26mg/g,可动油率为13%~24%;凉高山组页岩有机地球化学特征好,微观孔隙结构优,硅质矿物比例高,脆性指数高,利于改造。经估算,凉高山组页岩油资源量为26.75×10^(8) t,页岩气资源量为1.72×10^(12) m^(3),资源潜力巨大。研究成果可为四川盆地凉高山组的湖相页岩油勘探开发提供理论指导和技术支撑。Mineral composition of shale reservoirs in Lianggaoshan Formation of northeastern Sichuan Basin is com-plex.Clarifying basic geological characteristics of organic geochemistry and mineral composition is conductive to evaluate shale oil sweet spots and to optimize favorable areas.Shale reservoir samples from Lianggaoshan Formation are selected to reveal basic geological characteristics including mineral composition,microscopic pore structure,oil-bearing property and fluidity of shale reservoirs by experimental methods of whole rock XRD,FE-SEM,low-temperature nitrogen adsorption,high-pressure mercury injection,NMR and CLSM,and to analyze shale oil explo-ration potential.The results show that Lianggaoshan Formation shale in northeastern Sichuan Basin is mainly com-posed of quartz and clay minerals,with good source rock quality and geological basis for high production.Reservoir space is dominated by intergranular pores,intraranular pores and organic matter-hosted pores.Oil in shale is en-riched clusteredly in felsic-intergranular pores,linearly along lamellation fractures and scatteredly in matrix pores,with obvious separation between light components and heavy components.NMR centrifugation calculated movable oil content of Lianggaoshan Formation is 0.80~3.26 mg/g and movable oil rate is 13%~24%.Lianggaoshan Forma-tion shale has good organic geochemical property,excellent microscopic pore structure,high proportion of siliceous minerals and high brittleness index,which is conducive to stimulation.Estimated shale oil resource is 26.75×10^(8) t and shale gas resource is 1.72×10^(12) m^(3) in Lianggaoshan Formation,indicating enormous resource potential.The re-search provides theoretical guidance and technical support for exploration and development of lacustrine shale oil in Lianggaoshan Formation in Sichuan Basin.

关 键 词：页岩储层 页岩油 含油性 地质特征 四川盆地 凉高山组 

分 类 号：TE122[石油与天然气工程—油气勘探]