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扬子板块下寒武统页岩有机质与矿物质的成因关系
Genetic relationship between organic matters and minerals in the Lower Cambrian shale in Yangze Plate
张 慧1 焦淑静2 林伯伟1 郝临山1 袁立颖1
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DOI:10.12055/gaskk.issn.1673-3177.2017.04.004
作者单位:1. SGS 集团瑞华通正非常规油气技术检测(北京)有限公司 2. 中国石油大学(北京)能源材料微结构实验室
中文关键字:扬子板块 早寒武世 页岩 扫描电镜 显微组分 有机质 矿物质 赋存状态 成因关系
英文关键字:Yangzi Plate; Lower Cambrian; Shale; Scanning electron microscope; Maceral; Organic matter; Mineral; Occurrence
中文摘要:扬子板块下寒武统富含有机质,是我国页岩气勘探开发的重要层系,关于其页岩孔隙特征与生烃组分的研究成果很
多,但对其有机质与矿物质成因关系的研究则较少。以下寒武统海相页岩为研究对象,对其制备氩离子抛光面和自然断面样品借
助场发射扫描电镜观察研究页岩矿物的显微组分、成因、有机质赋存状态、有机质与矿物质的成因关系。观察与研究结果表明:
①下寒武统海相页岩主要矿物成分为石英和伊利石;有机质显微组分主要为沥青质体,赋存状态具多样性:抛光面样品有机质赋
存状态为条带状、散块状、填隙状、封裹状;自然断面样品有机质赋存状态为条带状、交互状、薄膜状。②矿物质成因不同,与
有机质的关系各异,陆源碎屑与有机质体现了碎屑岩的特征,即条带状、散块状有机质与矿物质为同生或准同生关系,形成于沉
积阶段,填隙状有机质与矿物质为胶结关系;封裹状、交互状有机质表征了自生矿物与有机质为结晶分异关系。这些现象的揭示
与认识为页岩气生成机理研究与勘探开发实践提供了微米级—纳米级的直观依据。
英文摘要:The Lower Cambrian in Yangzi Plate is organic rich, and it is the important series of strata for shale gas exploration and
development in China. There are many research results on the pore characteristics and hydrocarbon generating macerals of shale, but
the genetic relationship between the organic matters and the minerals was less researched. In this paper, the marine shale of Lower
Cambrian was taken as the study object. Its samples with argon ion polished surface and natural fractured surface were prepared, and
then their macerals, genesis, occurrence mode of organic matters and the genetic relationship between organic matters and minerals
were observed and analyzed by means of field emission scanning electron microscope. The following observation and research results
were obtained. First, the minerals in the marine shale of Lower Cambrian are mainly quartz and illite; and the organic macerals are
mainly amorphous bitumen and their modes of occurrence are diverse. For example, the organic matters in the samples with polished
surface are occurred in the shape of strip, scattered block, interstitial and envelope, and those in the samples with natural fractured
surface are occurred in the shape of strip, alterative and thin film. Second, the genesis of minerals is different and their relationships
with organic matters are different. The terrigenous debris and the organic matter embody the characteristics of clastic rocks. That is to
say it is in contemporaneous or penecontemporaneous relationship between the stripped and scattered blocky organic matters and the
minerals and they are formed in the stage of sedimentation; it is in cementation relationship between the interstitial organic matters
and the minerals; and the organic matters in the shape of envelope and alterative indicate the crystallization differentiation relationship
between the authigenic minerals and the organic matters. The identification and understanding of these phenomena provides the microand
nano-scale intuitive basis for the formation mechanism study and exploration and development practice of shale gas.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
主管单位:中国石油西南油气田公司  主办单位:中国石油西南油气田公司勘探开发研究院
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