川东北地区侏罗系页岩油储层地质特征及资源潜力  

Geologic characteristics and resource potential of Jurassic shale oil reservoirs in northeastern Sichuan

作　　者：王显东[1,2] 王志国 成德安[1,2] 马威奇 安测[1,2] 曾宏斌 徐亮 WANG Xiandong;WANG Zhiguo;CHENG De’an;MA Weiqi;AN Ce;ZENG Hongbin;XU Liang(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1-10,共10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)。

摘　　要：针对川东北地区侏罗系凉高山组页岩油储层特征非均质性强、资源潜力尚不清楚等问题,通过岩心实验数据分析,明确岩性和物性等“四性”特征,再利用体积法进一步落实川东北地区侏罗系页岩油储层资源潜力。结果表明:凉高山组页岩呈现石英含量高的特征,岩相多为纹层状长英质页岩,硅质纹层发育;自留井组大安寨段和东岳庙段页岩层系岩性组合较为相似,以灰岩、页岩互层为主,岩相多为纹层状混合质页岩,钙质纹层发育;3套页岩储层的平均孔隙度为4%~9%,储集空间类型主要为硅质颗粒晶间孔、黏土晶间孔、黄铁矿晶间孔、有机质孔和页理缝;通过“七性”关系评价,明确凉高山组上段1亚段底部、凉高山组上段2亚段底部和凉高山组上段3亚段顶部为凉高山组最优甜点层;大安寨段中部和东岳庙段顶部为自流井组最优甜点层;通过体积法对3个页岩层系进行资源潜力评价,明确仪陇—大竹地区是四川盆地侏罗系陆相页岩油气下一步勘探的有利区带。研究成果为凉高山组页岩油的增储上产奠定了基础。Regarding the issues of reservoir heterogeneity and unclear potential of resources in Jurassic Liang-gaoshan Formation shale oil in northeastern Sichuan,“4 properties”characteristics such as lithology and properties are clarified based on core experiments data analysis,and resource potential of Jurassic shale oil in northeastern Sichuan is determined via volumetric method.The results show that the shale of Lianggaoshan Formation exhibits high quartz content characteristics,and the lithology is mostly laminated felsic shale with siliceous laminae devel-oped.Lithological assemblage of shale strata series in Da’anzhai and Dongyuemiao members of Ziliujing Formation is similar,dominated by limestone-shale interbedding,and the lithology is mostly laminated mixed shale with cal-careous laminae developed.Average porosity of the 3 sets of shale reservoirs is 4%~9%,and reservoir space types mainly include siliceous intergranular pores,clay intercrystaline pores,pyrite intercrystaline pores,organic matter-hosted pores and lamellation fractures.Evaluation of“seven properties”relationship determines that the bottom of 1st sub-member in upper member of Lianggaoshan Formation,the bottom of 2nd sub-member in upper member of Lianggaoshan Formation and the top of 3rd sub-member in upper member of Lianggaoshan Formation are optimal sweet spots of Lianggaoshan Formation,while the middle part of Da’anzhai Member and the top of Dongyuemiao Member are optimal sweet spots of Ziliujing Formation.Finally,the resource potential evaluation of the 3 shale stra-ta series via volumetric method determines that Yilong-Dazhu area is a favorable play for further exploration of conti-nental shale oil and gas of Jurassic in Sichuan Basin.The research provides foundation for increasing reserves and production of shale oil in Lianggaoshan Formation.

关 键 词：川东北地区 侏罗系 页岩油 富集特征 资源潜力 

分 类 号：TE122[石油与天然气工程—油气勘探]