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Application of C7 hydrocarbons technique to oil and condensate from type III organic matter in Northwestern Taiwan

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Title: Application of C7 hydrocarbons technique to oil and condensate from type III organic matter in Northwestern Taiwan
Authors: Chang, Ching-Tse1,2 049476@cpc.com.tw, Lee, Maw-Rong2, Lin, Li-Hua1, Kuo, Cheng-Lung1
Source: International Journal of Coal Geology. Jun2007, Vol. 71 Issue 1, p103-114. 12p.
Subjects: Organic compounds, Natural gas, Biodegradation of petroleum, Hydrocarbons
Abstract: Abstract: The purpose of this study was to examine the potential of C7 light hydrocarbons as biomarkers for petroleum exploration. The oil and condensate reservoirs of the sedimentary basins in northwestern Taiwan generally are in the deltaic–littoral–neritic sandstones of Upper Oligocene to Upper Miocene strata. Oils and condensates produced from these basins are terrigenous, with a variable δ 13C‰ ratio −30.07 to −27.50‰/PDB, and Pristane/Phytane ratio from 4.79 to 9.22. A large set of condensate and oil samples were collected from major gas fields across the Hsinchu–Miaola basin, and the Kovat Index was used to identify C7 light hydrocarbons in the samples. The isomeric parameters of C7 included single-branched and multiple-branched heptanes and isomeric pairs, such as nC7/Methylcyclohexane ratio vs. Toluene/nC7 ratio, 2-MH+2, 3-DMP vs. 3-MH+2, 4-DMP, n-Heptane ratio vs. iso-Heptane ratio. The ratios for parent (P1), mono-branch (P2) and poly branch (P3) heptane isomers ranged from 37 to 64%, 29 to 45% and 6 to 19%, respectively. The ratios for nC7/Methylcyclohexane and Toluene/nC7 ranged from 0.16 to 0.60 and 1.52 to 10.58, respectively. The n-Heptane value and iso-Heptane value ranged from 10 to 26 and 0.8 to 1.8 respectively and the iso-alkanes (3RP), cyclopentanes (5RP), cyclohexanes (6RP) ratios ranged from 6 to 29%, 5 to 13% and 53 to 90%, respectively with the 2-MH+2,3-DMP vs. 3-MH+2,4-DMP found to be constant for the linear equation Y =1.1458X −0.0755. The use of this technique as a qualitative tool shows that all the oils from the northwestern Taiwan were mature, free of biodegradation, affected by evaporative fractionation and derived from the same petroleum system. The source rock of the oils should be terrigenous. [Copyright &y& Elsevier]
Copyright of International Journal of Coal Geology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
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  Data: Application of C<subscript>7</subscript> hydrocarbons technique to oil and condensate from type III organic matter in Northwestern Taiwan
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  Data: <searchLink fieldCode="AR" term="%22Chang%2C+Ching-Tse%22">Chang, Ching-Tse</searchLink><relatesTo>1,2</relatesTo><i> 049476@cpc.com.tw</i><br /><searchLink fieldCode="AR" term="%22Lee%2C+Maw-Rong%22">Lee, Maw-Rong</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Lin%2C+Li-Hua%22">Lin, Li-Hua</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kuo%2C+Cheng-Lung%22">Kuo, Cheng-Lung</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Coal+Geology%22">International Journal of Coal Geology</searchLink>. Jun2007, Vol. 71 Issue 1, p103-114. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Organic+compounds%22">Organic compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Natural+gas%22">Natural gas</searchLink><br /><searchLink fieldCode="DE" term="%22Biodegradation+of+petroleum%22">Biodegradation of petroleum</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrocarbons%22">Hydrocarbons</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Abstract: The purpose of this study was to examine the potential of C7 light hydrocarbons as biomarkers for petroleum exploration. The oil and condensate reservoirs of the sedimentary basins in northwestern Taiwan generally are in the deltaic–littoral–neritic sandstones of Upper Oligocene to Upper Miocene strata. Oils and condensates produced from these basins are terrigenous, with a variable δ 13C‰ ratio −30.07 to −27.50‰/PDB, and Pristane/Phytane ratio from 4.79 to 9.22. A large set of condensate and oil samples were collected from major gas fields across the Hsinchu–Miaola basin, and the Kovat Index was used to identify C7 light hydrocarbons in the samples. The isomeric parameters of C7 included single-branched and multiple-branched heptanes and isomeric pairs, such as nC7/Methylcyclohexane ratio vs. Toluene/nC7 ratio, 2-MH+2, 3-DMP vs. 3-MH+2, 4-DMP, n-Heptane ratio vs. iso-Heptane ratio. The ratios for parent (P1), mono-branch (P2) and poly branch (P3) heptane isomers ranged from 37 to 64%, 29 to 45% and 6 to 19%, respectively. The ratios for nC7/Methylcyclohexane and Toluene/nC7 ranged from 0.16 to 0.60 and 1.52 to 10.58, respectively. The n-Heptane value and iso-Heptane value ranged from 10 to 26 and 0.8 to 1.8 respectively and the iso-alkanes (3RP), cyclopentanes (5RP), cyclohexanes (6RP) ratios ranged from 6 to 29%, 5 to 13% and 53 to 90%, respectively with the 2-MH+2,3-DMP vs. 3-MH+2,4-DMP found to be constant for the linear equation Y =1.1458X −0.0755. The use of this technique as a qualitative tool shows that all the oils from the northwestern Taiwan were mature, free of biodegradation, affected by evaporative fractionation and derived from the same petroleum system. The source rock of the oils should be terrigenous. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of International Journal of Coal Geology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.coal.2006.06.011
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      – Code: eng
        Text: English
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        PageCount: 12
        StartPage: 103
    Subjects:
      – SubjectFull: Organic compounds
        Type: general
      – SubjectFull: Natural gas
        Type: general
      – SubjectFull: Biodegradation of petroleum
        Type: general
      – SubjectFull: Hydrocarbons
        Type: general
    Titles:
      – TitleFull: Application of C7 hydrocarbons technique to oil and condensate from type III organic matter in Northwestern Taiwan
        Type: main
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          Name:
            NameFull: Chang, Ching-Tse
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            NameFull: Lee, Maw-Rong
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            NameFull: Lin, Li-Hua
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            NameFull: Kuo, Cheng-Lung
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            – D: 01
              M: 06
              Text: Jun2007
              Type: published
              Y: 2007
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            – TitleFull: International Journal of Coal Geology
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