【引用本文】 谢小敏, 李利, 袁秋云, 等. 应用TIMA分析技术研究Alum页岩有机质和黄铁矿粒度分布及沉积环境特征[J]. 岩矿测试, 2021, 40(1): 50-60. doi: 10.15898/j.cnki.11-2131/td.202007120103
XIE Xiao-min , LI Li , YUAN Qiu-yun , et al. Grain Size Distribution of Organic Matter and Pyrite in Alum Shales Characterized by TIMA and Its Paleo-environmental Significance[J]. Rock and Mineral Analysis, 2021, 40(1): 50-60. doi: 10.15898/j.cnki.11-2131/td.202007120103

应用TIMA分析技术研究Alum页岩有机质和黄铁矿粒度分布及沉积环境特征

1. 油气资源与勘探技术教育部重点实验室, 长江大学资源与环境学院, 湖北 武汉 430100;

2. 南京宏创地质勘查技术服务有限公司, 江苏 南京 210000

收稿日期: 2020-07-12  修回日期: 2020-08-03 

基金项目: 国家自然科学基金面上基金项目(41972163)

作者简介: 谢小敏,博士,教授,主要研究方向为有机岩石学、地球化学与石油地质学。E-mail:xiaominxie2019@sina.com。。

Grain Size Distribution of Organic Matter and Pyrite in Alum Shales Characterized by TIMA and Its Paleo-environmental Significance

1. Key Laboratory of Oil and Gas Resources and Exploration Technology, Ministry of Education, College of Resources and Environment, Yangtze University, Wuhan 430100, China;

2. Nanjing Hongchuang Exploration Technology Service Co. LTD, Nanjing 211111, China

Received Date: 2020-07-12
Revised Date: 2020-08-03

摘要:Alum页岩(中寒武-早奥陶世)是北欧一套重要的海相烃源岩,其成熟度跨度从未成熟-过成熟度阶段。由于我国下古生界海相烃源岩均已过成熟,未成熟-低成熟度的Alum页岩是研究下古海相的烃源岩生烃潜力特征的重要参照样品。因此,对这套成熟度较低的Alum页岩的生物组成特征、矿物组成及其沉积环境的分析,可为后续国内外下古生界海相烃源岩的对比研究奠定基础。本文以欧洲上寒武统富含有机质Alum页岩为主要研究对象,在有机碳含量(TOC)和有机岩石学观察的基础上,应用综合矿物分析技术(TIMA)进行扫描,通过细化样品扫描参数,获得了页岩矿物组成、含量及粒度分布。Alum页岩有机质成熟度较低(固体沥青反射率为0.30),TOC含量在11.16%~12.24%之间。有机质主要为浮游藻类降解形成的层状藻类体、底栖藻类来源的海相镜状体和裂缝中充填的固体沥青。TIMA扫描获得的有机质相对质量百分含量为9.79%~10.64%,略低于碳硫分析仪测定的TOC含量;黄铁矿含量为4.17%~4.49%。TIMA扫描获得的有机质与黄铁矿比值与化学法的C/S比值相近,均分布在2.18~2.55范围。粒径分布特征上,有机质粒径主要分布在0.9~27.0μm之间(80%以上颗粒分布在1.2~5.5μm);草莓状黄铁矿粒径分布在0.9~17.0μm之间(小于0.5μm的颗粒占78%以上),反映缺氧甚至硫化的环境。综合C/S比、有机岩石学与TIMA黄铁矿粒度分布特征,认为该页岩形成于闭塞封闭甚至硫化的沉积水体体系。该研究为油气地质领域的烃源岩(包括页岩)的研究提供了一种新的技术支持。

关键词: TIMA分析技术, Alum页岩, 矿物组成, 有机质, 黄铁矿, 粒度统计, 沉积环境

Grain Size Distribution of Organic Matter and Pyrite in Alum Shales Characterized by TIMA and Its Paleo-environmental Significance

KEY WORDS: TIMA technique, Alum shale, mineral composition, organic matter, pyrite, grain size distribution, sedimentary environment

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Figures And Tables

应用TIMA分析技术研究Alum页岩有机质和黄铁矿粒度分布及沉积环境特征

谢小敏, 李利, 袁秋云, 吴芬婷, 林静文, 豆浩然