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Correlation among Vitrinite Reflectance Ro%, Pyrolysis Parameters, and Atomic H/C Ratio: Implications for Evaluating Petroleum Potential of Coal and Carbonaceous Materials

Received: 21 November 2014     Accepted: 7 December 2014     Published: 18 December 2014
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Abstract

In this study, 26 samples from northwest Taiwan, 12 from Mainland China, 13 from Australia and 39 from literature were jointly examined to explore relationships among pyrolysis parameters, Vitrinite Reflectance Ro%, and Atomic H/C ratio. Samples of mixed high and low maturity coal were combined in proportions determined by the total quantity in the furnace prior to the Rock-Eval analysis and used to explore the correlation between the pyrolysis parameter, Tmax, and the vitrinite reflectance. These average values were then plotted against the corresponding Tmax results. The experimental results revealed that:(1) For low maturity coal samples that were mixed with different proportions of high maturity coal samples, the Tmax values fell within a range of low maturities. Alternativly, for samples containing the reworked sedimentary materials in the rock formation, the Tmax values were similar to the maturity of young material. (2) For sampling or Rock-Eval analysis of the high maturity materials, contamination with low maturity material should be avoided, even in very small amounts. (3) Afterproportional mixing, there was no evidence of a general linear relationship between the average of vitrinite reflectance, Ro%, and the corresponding Tmax value recorded. The atomic H/C ratio, as well as the BI, HI, QI, S1, and S2, generally decreases while the maturity (Tmax (oC); vitrinite reflectance Ro%) increases. The atomic H/C ratio decreases slightly from 1.1 to 0.7 while maturity increased from Ro 0.55% to 0.85%. Samples with atomic H/C ratio within this range show significant change in certain other geochemical parameters (eg. BI, HI, QI, PI, S1, S2, S1+S2, Tmax). Organic matter in the samples studied is of type II/III kerogen based on the relationship between HI and Tmax. The hydrocarbon potential per unit organic carbon (S1+S2/TOC) of the organic matter in this study to be approximately 100~380, similar to the potential of humic coal used in general gas and oil production. This shows that organic matter in an oil window of Ro%=0.55 and atomic H/C=1.1 have reached a certain maturity and hydrocarbon potential. Overall, when the atomic H/C ratio increases, the BI, HI, QI, S1, and S2 also show an increasing trend; therefore, these parameters and atomic H/C ratio show a certain correlation.

Published in Journal of Energy and Natural Resources (Volume 3, Issue 6)
DOI 10.11648/j.jenr.20140306.12
Page(s) 85-100
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2014. Published by Science Publishing Group

Keywords

Atomic H/C Ratio, Vitrinite Reflectance Ro%, Kerogen, Rock-Eval Pyrolysis Tmax, Maceral Analysis, Reworked

References
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    Hsien-Tsung Lee, Li-Chung Sun. (2014). Correlation among Vitrinite Reflectance Ro%, Pyrolysis Parameters, and Atomic H/C Ratio: Implications for Evaluating Petroleum Potential of Coal and Carbonaceous Materials. Journal of Energy and Natural Resources, 3(6), 85-100. https://doi.org/10.11648/j.jenr.20140306.12

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    Hsien-Tsung Lee; Li-Chung Sun. Correlation among Vitrinite Reflectance Ro%, Pyrolysis Parameters, and Atomic H/C Ratio: Implications for Evaluating Petroleum Potential of Coal and Carbonaceous Materials. J. Energy Nat. Resour. 2014, 3(6), 85-100. doi: 10.11648/j.jenr.20140306.12

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    AMA Style

    Hsien-Tsung Lee, Li-Chung Sun. Correlation among Vitrinite Reflectance Ro%, Pyrolysis Parameters, and Atomic H/C Ratio: Implications for Evaluating Petroleum Potential of Coal and Carbonaceous Materials. J Energy Nat Resour. 2014;3(6):85-100. doi: 10.11648/j.jenr.20140306.12

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  • @article{10.11648/j.jenr.20140306.12,
      author = {Hsien-Tsung Lee and Li-Chung Sun},
      title = {Correlation among Vitrinite Reflectance Ro%, Pyrolysis Parameters, and Atomic H/C Ratio: Implications for Evaluating Petroleum Potential of Coal and Carbonaceous Materials},
      journal = {Journal of Energy and Natural Resources},
      volume = {3},
      number = {6},
      pages = {85-100},
      doi = {10.11648/j.jenr.20140306.12},
      url = {https://doi.org/10.11648/j.jenr.20140306.12},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.jenr.20140306.12},
      abstract = {In this study, 26 samples from northwest Taiwan, 12 from Mainland China, 13 from Australia and 39 from literature were jointly examined to explore relationships among pyrolysis parameters, Vitrinite Reflectance Ro%, and Atomic H/C ratio. Samples of mixed high and low maturity coal were combined in proportions determined by the total quantity in the furnace prior to the Rock-Eval analysis and used to explore the correlation between the pyrolysis parameter, Tmax, and the vitrinite reflectance. These average values were then plotted against the corresponding Tmax results. The experimental results revealed that:(1) For low maturity coal samples that were mixed with different proportions of high maturity coal samples, the Tmax values fell within a range of low maturities. Alternativly, for samples containing the reworked sedimentary materials in the rock formation, the Tmax values were similar to the maturity of young material. (2) For sampling or Rock-Eval analysis of the high maturity materials, contamination with low maturity material should be avoided, even in very small amounts. (3) Afterproportional mixing, there was no evidence of a general linear relationship between the average of vitrinite reflectance, Ro%, and the corresponding Tmax value recorded. The atomic H/C ratio, as well as the BI, HI, QI, S1, and S2, generally decreases while the maturity (Tmax (oC); vitrinite reflectance Ro%) increases. The atomic H/C ratio decreases slightly from 1.1 to 0.7 while maturity increased from Ro 0.55% to 0.85%. Samples with atomic H/C ratio within this range show significant change in certain other geochemical parameters (eg. BI, HI, QI, PI, S1, S2, S1+S2, Tmax). Organic matter in the samples studied is of type II/III kerogen based on the relationship between HI and Tmax. The hydrocarbon potential per unit organic carbon (S1+S2/TOC) of the organic matter in this study to be approximately 100~380, similar to the potential of humic coal used in general gas and oil production. This shows that organic matter in an oil window of Ro%=0.55 and atomic H/C=1.1 have reached a certain maturity and hydrocarbon potential. Overall, when the atomic H/C ratio increases, the BI, HI, QI, S1, and S2 also show an increasing trend; therefore, these parameters and atomic H/C ratio show a certain correlation.},
     year = {2014}
    }
    

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  • TY  - JOUR
    T1  - Correlation among Vitrinite Reflectance Ro%, Pyrolysis Parameters, and Atomic H/C Ratio: Implications for Evaluating Petroleum Potential of Coal and Carbonaceous Materials
    AU  - Hsien-Tsung Lee
    AU  - Li-Chung Sun
    Y1  - 2014/12/18
    PY  - 2014
    N1  - https://doi.org/10.11648/j.jenr.20140306.12
    DO  - 10.11648/j.jenr.20140306.12
    T2  - Journal of Energy and Natural Resources
    JF  - Journal of Energy and Natural Resources
    JO  - Journal of Energy and Natural Resources
    SP  - 85
    EP  - 100
    PB  - Science Publishing Group
    SN  - 2330-7404
    UR  - https://doi.org/10.11648/j.jenr.20140306.12
    AB  - In this study, 26 samples from northwest Taiwan, 12 from Mainland China, 13 from Australia and 39 from literature were jointly examined to explore relationships among pyrolysis parameters, Vitrinite Reflectance Ro%, and Atomic H/C ratio. Samples of mixed high and low maturity coal were combined in proportions determined by the total quantity in the furnace prior to the Rock-Eval analysis and used to explore the correlation between the pyrolysis parameter, Tmax, and the vitrinite reflectance. These average values were then plotted against the corresponding Tmax results. The experimental results revealed that:(1) For low maturity coal samples that were mixed with different proportions of high maturity coal samples, the Tmax values fell within a range of low maturities. Alternativly, for samples containing the reworked sedimentary materials in the rock formation, the Tmax values were similar to the maturity of young material. (2) For sampling or Rock-Eval analysis of the high maturity materials, contamination with low maturity material should be avoided, even in very small amounts. (3) Afterproportional mixing, there was no evidence of a general linear relationship between the average of vitrinite reflectance, Ro%, and the corresponding Tmax value recorded. The atomic H/C ratio, as well as the BI, HI, QI, S1, and S2, generally decreases while the maturity (Tmax (oC); vitrinite reflectance Ro%) increases. The atomic H/C ratio decreases slightly from 1.1 to 0.7 while maturity increased from Ro 0.55% to 0.85%. Samples with atomic H/C ratio within this range show significant change in certain other geochemical parameters (eg. BI, HI, QI, PI, S1, S2, S1+S2, Tmax). Organic matter in the samples studied is of type II/III kerogen based on the relationship between HI and Tmax. The hydrocarbon potential per unit organic carbon (S1+S2/TOC) of the organic matter in this study to be approximately 100~380, similar to the potential of humic coal used in general gas and oil production. This shows that organic matter in an oil window of Ro%=0.55 and atomic H/C=1.1 have reached a certain maturity and hydrocarbon potential. Overall, when the atomic H/C ratio increases, the BI, HI, QI, S1, and S2 also show an increasing trend; therefore, these parameters and atomic H/C ratio show a certain correlation.
    VL  - 3
    IS  - 6
    ER  - 

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Author Information
  • Department of Electrical and Information Technology, Nan Kai University of Technology, Nan Tou County, Taiwan

  • Department of Electrical and Information Technology, Nan Kai University of Technology, Nan Tou County, Taiwan

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