高成熟陆相页岩油气源——储特征及富集层段评价方法——以川东复兴地区侏罗系东岳庙段为例  

Source-reservoir features and favorable enrichment interval evaluation methods of high mature continental shale:A case study of the Jurassic Dongyuemiao Member in the Fuxing area,eastern Sichuan Basin

作　　者：刘忠宝 胡宗全[1,2] 刘光祥 李鹏[2] 李雄[3] 刘晧天[3] 周林[3] 王鹏威 路菁[2] LIU Zhongbao;HU Zongquan;LIU Guangxiang;LI Peng;LI Xiong;LIU Haotian;ZHOU Lin;WANG Pengwei;LU Jing(State Key Laboratory of Shale Oil&Gas Enrichment Mechanisms and Effective Development,Beijing 100083,China;Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 100083,China;Exploration and Production Research Institute of Jianghan Oilfield Company,SINOPEC,Wuhan,Hubei 430070,China)

机构地区：[1]页岩油气富集机理与有效开发国家重点实验室 [2]中国石化石油勘探开发研究院 [3]中国石化江汉油田分公司勘探开发研究院

出　　处：《天然气工业》2022年第10期11-24,共14页Natural Gas Industry

基　　金：国家科技重大专项“陆相层系页岩气勘探潜力评价”(编号:2017ZX05036004);中国石油化工股份有限公司技术开发项目“川东北地区自流井组页岩气富集主控因素与有利目标”(编号:P19017-2)。

摘　　要：评价优选陆相页岩油气富集有利层段、确定水平井最佳穿行靶窗是制约陆相页岩油气勘探开发的瓶颈。为此,以四川盆地东部复兴地区侏罗系自流井组东岳庙段页岩为研究对象,在岩心观察描述的基础上,采用岩石薄片、有机岩石学、干酪根碳同位素、氩离子抛光—扫描电镜及孔隙度测试等多种实验方法,以小层为单元开展了岩相、烃源及储集特征精细表征,探索性建立了陆相页岩油气有利层段评价方法。研究结果表明:(1)东岳庙段富有机质页岩主要发育在东一亚段,页岩黏土矿物含量高,富含毫米级—厘米级介壳纹层及薄层,以中碳—高碳黏土质页岩、中碳介壳纹层状黏土质页岩为主;(2)东一亚段页岩有机质类型纵向上发生了4次频繁变化,自下而上依次为腐殖型—偏腐殖混合型—偏腐泥混合型—偏腐殖混合型,不同层段生烃能力存在差异;(3)东一亚段上部第3小层、第4小层固体沥青较发育,有机质类型好,生烃能力强,有机质孔较发育,页岩油气有效储集能力好;(4)以总有机碳含量与孔隙度分析为基础,将有机岩石学与氩离子抛光—扫描电镜相结合,基于纵向微观源(有机显微组分)—储(有机质孔)匹配关系定性评价有利层段,结合有机质类型提出原始氢指数比评价参数,建立陆相页岩源—储耦合系数计算公式及评价标准,可实现陆相页岩油气有利层段定量评价。结论认为,建立的陆相页岩油气富集层段定性—定量评价方法,可满足陆相页岩油气钻井过程中水平井穿行层段优选的生产需求。Evaluating and optimizing favorable intervals and determining the optimum horizontal well targets are bottlenecks that restrict continental shale oil and gas exploration and development.For this purpose,by taking the shale in the Dongyuemiao Member of the Jurassic Ziliujing Formation in the Fuxing area of the Eastern Sichuan Basin as an object,the lithofacies,source rocks and reservoirs of different sections were finely characterized based on core observation and description,various experimental test techniques and methods such as rock thin section,organic petrology,kerogen carbon isotope,scanning electron microscope after argon ion polishing and porosity test.The following results were achieved.(1) Organic-rich shale in the Dongyuemiao Member is mainly developed in its first sub-member(Dong-1 for short),with high clay mineral content,rich millimeter-centimeter scale shell lamina.It is dominated by medium-high carbon argillaceous shale and medium-carbon shell lamina argillaceous shale.(2) The kerogen type in Dong-1 varies frequently for four times in the vertical direction,i.e.,humus type-humus-dominated mixed type-sapropel-dominated mixed type-humus-dominated mixed type from bottom to top,suggesting different hydrocarbon generation capacity.(3) Section No.3 and section No.4 in the upper part of Dong-1 have abundant bitumen,with a good organic matter type,high hydrocarbon generation capacity,more organic pores and effective storage capacity.(4) On the basis of TOC and porosity analysis,organic petrology and argon ion polishing scanning electron were used to qualitatively evaluate favorable intervals based on coupling between micro-scale source rocks(organic macerals)-reservoir(organic matter pores) in the vertical direction.Furthermore,the hydrogen index ratio based on organic matter types is introduced to establish calculation formula and evaluation standard of source-reservoir coupling coefficient for continental shale,which can quantitatively evaluate favorable continental shale oil and gas intervals.The estab

关 键 词：陆相页岩 下侏罗统 自流井组东岳庙段 有机显微组分 页岩储层 有机质孔 源—储匹配关系 评价方法 

分 类 号：P618.13[天文地球—矿床学]