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天然气地球科学

• 天然气地球化学 • 上一篇    下一篇

含铁矿物对褐煤生烃演化的催化作用

  

  1. 1.中国科学院地质与地球物理研究所油气资源研究重点实验室,甘肃 兰州 730000; 2.中国科学院大学,北京 100049
  • 收稿日期:2013-07-17 修回日期:2013-11-27 出版日期:2014-07-10 发布日期:2014-07-10
  • 作者简介:马向贤 (1987-)，男，宁夏固原人，助理研究员，博士，主要从事油气地质与构造地球化学研究.
  • 基金资助:

    中国科学院知识创新工程青年人才领域前沿项目(编号：Y207KF1-MXX)；中国科学院西部行动计划项目(编号：KZCX2-XB3-12)联合资助.

Catalysis of Iron-bearing Minerals on Hydrocarbon Generation and Evolution of Brown Coal

  1. 1.Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China;2.University of the Chinese Academy of Sciences,Beijing 100049,China
  • Received:2013-07-17 Revised:2013-11-27 Online:2014-07-10 Published:2014-07-10

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摘要：

作为煤系烃源岩中重要的无机组分，含铁矿物对有机—无机相互作用和油气生成具有重要意义。对褐煤样品添加不同含铁矿物的加热模拟实验结果显示，菱铁矿对气态烃和液态烃（氯仿沥青“A”）均有催化作用，其中甲烷、气态C+4、液态饱和烃和非烃产率增加较显著。与菱铁矿一样，赤铁矿也能促进气态烃产率的增加，但却使褐煤液态烃的生成高峰推迟（350℃推迟至375℃），且在450℃及其之后对液态烃的生成表现为抑制作用。应用穆斯堡尔谱对实验前后样品中铁元素化学种检测发现，从375℃开始，赤铁矿在褐煤生烃的过程中被还原为磁铁矿（Fe3O4）。菱铁矿在450℃的加热模拟实验后变成磁铁矿（Fe3O4）。其本质说明含铁矿物在中低温阶段对褐煤生烃具有吸附—催化作用，而在中高温阶段与有机质发生复杂的有机—无机反应。

关键词: 含铁矿物, 褐煤, 催化机制, 穆斯堡尔谱

Abstract:

As an important inorganic mineral in the coal measures,the catalysis of iron-bearing minerals plays an important role in organic-inorganic interactions and hydrocarbon generation. With the addition of different iron-bearing minerals into brown coal samples for the thermal simulation experiment,the results show that siderite has catalytic effects on the generation of gaseous and liquid hydrocarbon (chloroform asphalt “A”). Among them,methane,C+4,liquid saturated hydrocarbon and non-hydrocarbon increased remarkably. Hematite could increase the production of gaseous hydrocarbon as well as siderite,but it delayed the liquid hydrocarbon generation from 350℃ to 375℃,and played inhibiting effect on liquid hydrocarbon generation at and after 450℃. The iron speciation before and after the thermal simulation experiment were examined by a mssbauer spectroscopy. It suggested that hematite was progressively reduced to magnetite (Fe3O4) during the process of hydrocarbon generation from 375℃ as well as siderite from 450℃. It is essentially illustrated that iron-bearing minerals played as catalyzator during hydrocarbon generation at low temperature stage,and participated in the complicated organic-inorganic reaction at the high temperature stage.

Key words: Iron-bearing minerals, Brown coal;Catalytic mechanism, Mssbauer spectroscopy

中图分类号: 

  • TE122.1+13

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