岩性油气藏 ›› 2016, Vol. 28 ›› Issue (5): 59–66.doi: 10.3969/j.issn.1673-8926.2016.05.007

• 油气地质 • 上一篇    下一篇

川东地区下古生界五峰组—龙马溪组页岩岩相划分及其与储层关系

朱逸青1,2,王兴志1,2,冯明友1,2,李 可1,2   

  1. (1.油气藏地质及开发工程国家重点实验室·西南石油大学,成都 610500;2.西南石油大学 天然气地质四川省高校重点实验室, 成都 610500)
  • 出版日期:2016-09-29 发布日期:2016-09-29
  • 通讯作者: 王兴志(1964-),男,博士,教授,博士生导师,主要从事沉积学和储层地质学等方面的教学与科研工作。E-mail:wxzswpi@163.com。
  • 作者简介:朱逸青(1987-),男,西南石油大学在读博士研究生,研究方向为沉积学与储层地质学。地址:(610500)四川省成都市新都区新都大道 8号西南石油大学。E-mail:gk_420@163.com
  • 基金资助:

    国家自然科学基金项目“页岩气低成本高效钻完井技术基础研究”(编号:U1262209)资助

Lithofacies classification and its relationship with reservoir of the Lower Paleozoic Wufeng-Longmaxi Formation in the eastern Sichuan Basin

Zhu Yiqing  1,2, Wang Xingzhi  1,2, Feng Mingyou 1,2, Li Ke 1,2   

  1. (1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University,Chengdu 610500, China; 2. Sichuan Provincial University Key Laboratory of Natural Gas Geology,Southwest Petroleum University, Chengdu 610500, China)
  • Online:2016-09-29 Published:2016-09-29

摘要:

随着“重庆涪陵”等国家级页岩气示范区的建立,四川盆地东部下古生界五峰组—龙马溪组富有机质页岩已成为目前中国页岩气研究的重点目标之一,至今已取得了大量相关研究成果,但关于页岩气研究的基础——页岩岩相分类的方案一直存在很大的分歧。以川东地区下古生界五峰组—龙马溪组页岩为研究对象,通过野外剖面与钻井岩心的观察,结合岩石结构组分分析,利用石英含量、石英成因及纹层类型 3 种判别依据,对页岩岩相进行了划分,并根据川东地区 WQ2 井的含气量、有机碳含量及石英含量,对岩相与储层的关系进行了评价。研究区页岩岩相可划分为 7 种类型:贫硅纹层页岩岩相、中硅纹层页岩岩相、富硅纹层页岩岩相、贫硅无纹层页岩岩相、中硅无纹层页岩岩相、富硅无纹层页岩岩相及生物硅质成因页岩岩相,其中,中硅无纹层页岩岩相是川东地区最有利于页岩气富集的岩相。

关键词: 储层类型, 储层特征, 表生岩溶作用, 控制因素, 雷口坡组, 四川盆地

Abstract:

With the establishment of the “Chongqing Fuling” national demonstration zone of shale gas, organic?rich shale of the Lower Paleozoic Wufeng?Longmaxi Formation has become a key research objective in the eastern Sichuan Basin, and a larger number of relevant research results have been obtained. However, there has been a great divergence in the scheme of the shale lithofacies classification. The quartz content, quartz genesis and shale lamina type were applied to divide the shale lithofacies based on field geological profile, core observation and shale structure component. According to the gas content, total organic carbon content and quartz content of the Well WQ2 in the eastern Sichuan Basin, the relationships between shale lithofacies and reservoir properties were evaluated. The shale lithofacies was divided into seven types: silicon?poor laminar shale facies, silicon laminar shale facies, silicon?rich laminar shale facies, silicon?poor non?laminar shale facies, silicon non?laminar shale facies, silicon?rich non?laminar shale facies and biological siliceous shale facies. It is considered that the silicon non?layer shale facies is favorable for shale gas accumulation in the eastern Sichuan Basin.

Key words: reservoir type, reservoir characteristics, epigenic karstification, controlling factors, Leikoupo Formation, Sichuan Basin

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