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Natural Gas Geoscience doi: 10.11764/j.issn.1672-1926.2017.06.004

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Comparativeresearch on the yields and chemical compositions of light hydrocarbonsderived from pyrolysis of organic matters with different types

Qi Shuai1,2,3,4，Li Xian-qing1,2，He Kun3,4，Zhang Guang-wu5，Chen Jin-ming1,2,3,4，Gao Wen-jie1,2，Liang Wan-le1,2   

  1. 1.State Key Laboratory of Coal Resources and Safe Mining，China University of Mining and Technology(Beijing)，
    Beijing 100083，China;2.College of Geoscience and Surveying Engineering，China University of Mining and
    Technology(Beijing),Beijing 100083,China;3.Research Institute of Petroleum Exploration and Development,
    PetroChina,Beijing 100083,China;4.Key Laboratory of Petroleum Geochemistry,CNPC,Beijing 100083,China;
    5.Langfang Branch,Research Intitute of Petroleum Exploration & Development,PetroChina,Langfang 065007,China
  • Received:2017-04-12 Revised:2017-05-18 Online:2017-06-10 Published:2017-06-10

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Abstract:

Based on gold-tube pyrolysis experiments and quantitative determination of light hydrocarbon(C6-14) products,the yields and composition characteristics of light hydrocarbons derived from different types of organic matters were studied in the paper.The quantification of light hydrocarbon products by PY-GC-MS,shows that C6-14 yieldsfrom lacustrine Type-Ⅰ and marine Type-Ⅱ1 organic matters with high IH areapparently higher than that from marine Type-Ⅱ2 organic matter.The maximum light hydrocarbon yields of Cretaceous lacustrine type I organic matter,Xiamaling type Ⅱ1 organic matter and Permian typeⅡ2 organic matter are 33.56,39.58 and 10.08mg/gTOC,respectively.Relatively,the content of aromatic hydrocarbons in light hydrocarbon products is obviously higher than that of saturated hydrocarbons.Meanwhile,the corresponding pyrolysis temperature or maturity reaching the maximum C6-14 yield for Type-Ⅰ kerogen is lower than that forType- Ⅱ kerogen.The evolution of the yields of normal alkanes(n-alkanes) with different carbon number during gold-tube pyrolysis,indicates that the equivalent vitrinite reflectance(Easy% RO) with the maximum yield forn-alkanes with lower carbon number is much higher than that with higher carbon number.This is attributed to the higher generation and cracking activation energy of lower carbon alkanes.By analysis of the light hydrocarbon compositions,we think that several parameters including the content of naphthalene,benzene/hexane and toluene/heptane are well relevant with maturity,and can be used to indicate the degree of thermal evolution of organic matters.

Key words: Different types of organic matters, Compositions of light hydrocarbons, Gold-tube pyrolysis, PY-GC-MS, Thermal evolution

CLC Number: 

  • TE122.1+13

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