四川盆地复兴地区侏罗系页岩源——储耦合特征及页岩油气甜点优选  

Source-reservoir coupling characteristics of Jurassic shale and sweet spot selection of shale oil/gas in Fuxing area of the Sichuan Basin

作　　者：魏志红[1,2] 石文斌 魏祥峰 刘苗苗[1,2] 陈超 王道军[1,2] 谢佳彤 WEI Zhihong;SHI Wenbin;WEI Xiangfeng;LIU Miaomiao;CHEN Chao;WANG Daojun;XIE Jiatong(Sinopec Exploration Company,Chengdu,Sichuan 610041,China;State Key Laboratory of Shale Oil&Gas Enrichment Mechanisms and Effective Development,Beijing 102206,China)

机构地区：[1]中国石化勘探分公司 [2]页岩油气富集机理与高效开发全国重点实验室

出　　处：《天然气工业》2025年第1期37-52,共16页Natural Gas Industry

基　　金：中国石化科技部“十条龙”项目“涪陵地区侏罗系陆相页岩油气勘探评价技术”(编号:P21078-1);中国石化油田部重大导向项目“四川盆地及周缘新区新层系页岩油气勘探潜力评价与目标评选”(编号:YTBZD-FCZY-2023-1)。

摘　　要：为了落实四川盆地复兴地区侏罗系页岩源—储关系,明确页岩油气甜点层段,基于岩矿场发射扫描电子显微镜观测、地球化学分析及不同纹层剥离测试、核磁共振分析等多种手段,系统分析了页岩的结构、纹层、矿物、有机质丰度、储集性能及含油气性,并划分了页岩源—储耦合类型,明确了其对页岩油气甜点分布的控制作用,最后落实了侏罗系页岩油气的甜点层段。研究结果表明:(1)侏罗系富有机质页岩主要发育于自流井组东岳庙段一亚段(以下简称东一亚段)、凉高山组二段下亚段(以下简称凉二下亚段),并可识别出10种岩相,其中灰黑色富碳粉砂纹层黏土页岩、灰黑色富碳介屑纹层黏土页岩为最有利岩相。(2)东一亚段(4)层、凉二下亚段(6)层—(8)层页岩具有中高总有机碳含量(TOC)、高孔隙度、高含油气性特征。(3)侏罗系页岩中发育黏土矿物纹层、长英质碎屑纹层、介屑/碳酸盐矿物纹层,其中黏土矿物纹层具有最高的生烃能力与含油气性;宏观上夹层起隔挡封闭作用,有利于页岩油气原位滞留。(4)侏罗系页岩中可识别出6种源—储耦合类型,其中,高TOC—高孔型、中高TOC—高孔型、高TOC—高孔/微裂缝型源—储耦合系数最高。结论认为:(1)东一亚段的(2)层、(4)层、凉二下亚段的(6)层、(8)层横向分布稳定,累计厚度大,耦合系数最高,为A类地质甜点,是目前最现实的页岩油气勘探开发对象;(2)东一亚段的(1)层、(3)层耦合系数较高,凉二下亚段的(4)层、(7)层脆性高,可改造性强,为B类地质甜点,是下一步页岩油气拓展勘探开发对象。In order to clarify the source-reservoir relationship of the Jurassic shale in the Fuxing area of the Sichuan Basin and determine the sweet spot intervals of shale oil/gas,this paper systematically analyzes the texture,laminae,minerals,organic matter abundance,reservoir properties and oil/gas bearing property of shale by means of FESEM,geochemical analysis,delamination test and NMR.Then,shale source-reservoir coupling is classified,and its controlling effect on the distribution of the sweet spots of shale oil/gas is understood.Finally,the sweet spot intervals of the Jurassic shale oil/gas are defined.The following results are obtained.First,the Jurassic organic-rich shale is mainly developed in the first submember of Dongyuemiao Member of Ziliujing Formation(Dong 1 submember)and the lower submember of the second member of Lianggaoshan Formation(Lower Liang 2 Member).Ten types of lithofacies are identified,among which,the grayish black carbon-rich silt-laminated clay shale and the grayish black carbon-rich medium debris-laminated clay shale are the most favorable lithofacies.Second,the layer④of Dong 1 submember and the layers⑥-⑧of Lower Liang 2 Member are characterized by moderate–high TOC,high porosity and high oil/gas content.Third,the Jurassic shale develops clay mineral laminae,felsic debris laminae and moderate debris/carbonate mineral laminae.The clay mineral laminae is the highest in hydrocarbon generation capacity and oil/gas content.Macroscopically,the interbeds act as barriers and seals,which is conducive to the in-situ retention of shale oil/gas.Fourth,six types of source-reservoir coupling can be identified in the Jurassic shale,among which,the high TOC and high porosity type,the moderate–high TOC and high porosity type,and the high TOC and high porosity/micro-fracture type have the highest source-reservoir coupling coefficients.In conclusion,the layers②and④of Dong 1 submember and the layers⑥and⑧of Lower Liang 2 Member are stably distributed laterally with large cumulative thickness a

关 键 词：四川盆地 复兴地区 侏罗系 页岩 纹层 源—储耦合 页岩油气 甜点层段 

分 类 号：TE122.2[石油与天然气工程—油气勘探]