王瑶琳,徐胜林,侯明才,陈安清,石坻石,张聪,覃英伦
WANG Yaolin,XU Shenglin,HOU Mingcai,CHEN Anqing,SHI Dishi,ZHANG Cong,QIN Yinglun

• 1:成都理工大学沉积地质研究院
• 2:油气藏地质及开发工程国家重点实验室
• 3:中国地质调查局油气资源调查中心
• 4:广西广投能源集团有限公司

摘要(Abstract)：

云南保山地区下志留统下仁和桥组富有机质页岩具有较好的页岩气勘探潜力，但对有机质富集因素的研究相对薄弱。选取5个剖面的30件样品进行了有机质丰度、有机质类型、有机质成熟度与无机地球化学特征分析，从古气候、古生产力、古氧化还原条件、陆源输入的角度剖析了保山地区下志留统下仁和桥组页岩有机质富集的影响因素，并建立了有机质富集模型。结果表明：保山地区下仁和桥组富有机质页岩的黏土矿物质量分数为15%～58%，脆性矿物质量分数为40%～85%,w(TOC）最高为2.59%，镜质体反射率为1.31%～2.69%；有机质类型主要是Ⅰ型—Ⅱ_1型；CIA和w(Sr）/w(Cu）指数表明下仁和桥组沉积期为温暖湿润气候，化学风化强烈，陆源输入增加，有利于有机质的形成和保存；w(V)/w(Cr)、U_(EF)和Mo_(EF)表明保山地区下仁和桥组页岩形成于缺氧—贫氧环境沉积，有利于有机质富集和保存；w (Al_2O_3）和w(SiO_2）与w(TOC）的相关性较好，指示陆源物质的输入对有机质富集有利。研究成果为保山地区下仁和桥组页岩气的勘探开发提供了依据。
Organic-rich shale of Lower Silurian Xiarenheqiao Formation in Baoshan area of Yunnan has much shale gas exploration potential,but lack of research on the factors of organic matter enrichment.In this study,30 samples are selected from 5 sections to analyze organic matter abundance,organic matter type,organic matter maturity,and inorganic geochemical characteristics.Influencing factors of organic matter enrichment in the shale of Lower Silurian Xiarenheqiao Formation in Baoshan area are analyzed from perspectives of paleoclimate,paleoproductivity,paleo-redox conditions and terrestrial input,and an organic matter enrichment model is established.The results show that the organic-rich shale of Xiarenheqiao Formation in Baoshan area has clay mineral mass fraction of 15%～58%,brittle mineral mass fraction of 40%～85%,maximum w(TOC)of 2.59%,and vitrinite reflectance of 1.31%～2.69%.Organic matter is mainly type Ⅰ-type Ⅱ_1.CIA and w(Sr）/w(Cu)indexes indicate that Xiarenheqiao Formation had warm and humid climate during deposition period,with strong chemical weathering and increased terrestrial input,which is conducive to enrichment and preservation of organic matter.w(V)/w(Cr),U_(EF)and Mo_(EF)indicate that the shale of Xiarenheqiao Formation in Baoshan area was formed in anoxic-dysoxic environment deposits,which is conducive to enrichment and preservation of organic matter.w(Al_2O_3)and w(SiO_2)have good correlation with w(TOC),indicating that input of terrestrial materials is beneficial to enrichment of organic matter.The research results provide basis for exploration and development of shale gas in Xiarenheqiao Formation in Baoshan area.

关键词(KeyWords)： 富有机质页岩;富集因素;下仁和桥组;下志留统;保山地区
organic-rich shale;enrichment factor;Xiarenheqiao Formation;Lower Silurian;Baoshan area

Abstract:

Keywords:

基金项目(Foundation): 中国地质调查局科研项目“云南宁蒗、保山地区古生界页岩气富集条件调查”（DD2016-0178）

作者(Author): 王瑶琳,徐胜林,侯明才,陈安清,石坻石,张聪,覃英伦
WANG Yaolin,XU Shenglin,HOU Mingcai,CHEN Anqing,SHI Dishi,ZHANG Cong,QIN Yinglun

DOI: 10.19597/j.issn.1000-3754.202108020

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