天然气地球科学

• 天然气地质学 • 上一篇    下一篇

页岩中固体沥青拉曼光谱参数作为成熟度指标的意义

王茂林,肖贤明,魏强,周秦   

  1. 1.中国科学院广州地球化学研究所,有机地球化学国家重点实验室,广东 广州510640;
    2.中国科学院大学,北京 100049
  • 收稿日期:2015-04-26 修回日期:2015-05-22 出版日期:2015-09-10 发布日期:2015-09-10
  • 通讯作者: 肖贤明(1962-),男,湖南汉寿人,研究员,博士,博士生导师,主要从事油气地质及地球化学研究. E-mail:xmxiao@gig.ac.cn.
  • 作者简介:王茂林(1988-),男,山东威海人,博士研究生,主要从事页岩油气方面的研究. E-mail:wangmaolinge@163.com.
  • 基金资助:

    国家科技重大专项(编号:2011ZX05008-002-40);国家重点基础研究发展计划("973”)(编号:2012CB214705);中国科学院战略性先导专项(编号:XDB10040300)联合资助.

Thermal Maturation of Solid Bitumen in Shale as Revealed by Raman Spectroscopy

WANG Mao-lin,XIAO Xian-ming,WEI Qiang,ZHOU Qin   

  1. 1.State Key Laboratory of Organic Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy
    of Sciences,Guangzhou 510640,China;2.University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2015-04-26 Revised:2015-05-22 Online:2015-09-10 Published:2015-09-10

摘要:

中国南方下古生界页岩成熟度很高、缺乏镜质组、固体沥青反射率变化大,成熟度的精确评价一直没有得到完善解决。通过对取自扬子地区古生界页岩样品中固体沥青(BRO=0.43%~5.51%)激光拉曼光谱特征的研究,发现固体沥青的激光拉曼光谱参数:峰位参数(WD与WG)、峰位差(RBS)、半高宽(FWHM-D与FWHM-G)及峰强度比(ID/IG)与沥青反射率均体现出一定的相关性,但相关程度差别明显,而且还明显受到成熟度水平的制约。对这些参数与沥青反射率进行了直线回归,筛选出了相关性比较好的指标是RBS(BRO值范围为1.5%~3.5%)与ID/IG(BRO >3.5%),两者相关系数高达0.95以上。研究认为,在建立标准方法的基础上,固体沥青激光拉曼光谱的这2个参数对早古生代及前寒武纪地层成熟度评价具有实际应用价值。

关键词: 下古生界页岩, 固体沥青, 反射率, 拉曼光谱参数, 成熟度

Abstract:

The Lower Paleozoic shale from the South China region has very high maturity and is lack of vitrinite.Although solid bitumen usually occurs in shale,its measuring reflectance value varies widely,thus there is a big challenge to determine the exact maturity of the shale,which puzzles the conventional and unconventional petroleum exploration conducted in this area for many years.In this study,the Raman spectroscopic characteristics of solid bitumen in shale samples taken from the Yangtze region with different maturities(BRO =0.43%-5.51%)were investigated.The results indicate that the Raman spectral parameters of the solid bitumen,including band position(WD and WG),band separation(RBS),full width at half maximum(FWHM-D and FWHM-G),and band intensity ratio (ID/IG) are all related to the bitumen reflectance,but with considerably different correlations,constrained apparently by maturity.Linear regressions were performed between these parameters and bitumen reflectance,and some parameters with higher correlation were selected.They are RBS(within 1.5%-3.5% of BROand ID/IG (with BRO>3.5%),showing a correlation coefficient as high as 0.95.It is believed that the two Raman spectral parameters of solid bitumen will be of significant practical use for the maturity assessment of the Lower Paleozoic shale when standard measurement and curve fitting procedures are utilized.

Key words: Lower Paleozoic shale, Solid bitumen, Reflectance, Raman spectral parameter, Maturity

中图分类号: 

  • TE122.2

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