四川盆地及周缘下古生界五峰组-龙马溪组页岩岩相分类  

Lithofacies classification of shales of the Lower Paleozoic Wufeng-Longmaxi Formations in the Sichuan Basin and its surrounding areas,China

作　　者：冉波[1,2] 刘树根[1] 孙玮[1,2] 叶玥豪[1] 邱嘉文 张健[1] 杨迪[1] 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,四川成都610059 [2]成都理工大学地球科学学院,四川成都610059

出　　处：《地学前缘》2016年第2期96-107,共12页Earth Science Frontiers

基　　金：四川省科技支撑计划项目(15ZC1390);国家自然科学基金项目(41102064)

摘　　要：基于涪陵焦石坝地区页岩气高产工业气流的推动,四川盆地及其周缘下古生界五峰组-龙马溪组页岩已经成为了中国页岩气研究的重点,至今已取得大量相关研究成果,这进一步推动了页岩气研究工作的深入。但作为页岩及页岩气研究的基础——页岩岩相分类这个问题却一直存在明显争议,为此本文全面梳理了国内外页岩岩相分类方案及相关研究,有机结合了国内五峰组-龙马溪组页岩的研究和勘探实例,确定了页岩岩相分类的两个核心指标(石英百分含量、纹层发育程度),构建了五峰组-龙马溪组页岩岩相的分类流程,建立了9种不同类型的页岩岩相:(1)贫硅不平行纹层页岩;(2)中硅不平行纹层页岩;(3)富硅不平行纹层页岩;(4)贫硅平行纹层页岩;(5)中硅平行纹层页岩;(6)富硅平行纹层页岩;(7)贫硅不明显纹层页岩;(8)中硅不明显纹层页岩;(9)富硅不明显纹层页岩。在系统的页岩岩相分类基础上进一步提出了四川盆地及周缘进行页岩气勘探最有利层段的页岩岩相的三高特征:高石英含量、高TOC含量及高压裂性。The Lower Paleozoic Wufeng-Longmaxi shale in the Sichuan Basin and its surrounding areas,China,is a key point of Chinese shale gas industry which has been promoted by more and more related achievements since the finding of high-yield industrial shale gas in the Jiaoshiba area.However,there has been significant controversy on the classification of lithofacies which is regarded as the basis of shale and shale gas.This study has proposed two core indexes for shale lithofacies classification,including the content of quartz and the lamination style,based on a comprehensive review of lithofacies classifications at home and abroad and combined with the research and exploration results for the Wufeng-Longmaxi shale.Then nine lithofacies of the Wufeng-Longmaxi shale have been recognized based on the complete lithofacies classification process：（1）siliceous-poor nonparallel laminated shale,（2） siliceous-moderate nonparallel laminated shale,（3） siliceous-rich nonparallel laminated shale,（4）siliceous-poor parallel laminated shale,（5）siliceous-moderate parallel laminated shale,（6）siliceous-rich parallel laminated shale,（7）siliceous-poor indistinctly laminated shale,（8）siliceousmoderate indistinctly laminated shale,（9）siliceous-rich indistinctly laminated shale.Three unique lithologic characteristics in the favorable exploration section include high quartz content,high TOC content and high friability in the Sichuan Basin and its surrounding areas.

关 键 词：四川盆地 页岩气 五峰组-龙马溪组 页岩岩相 

分 类 号：P534.43[天文地球—古生物学与地层学]