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Late-Stage Hydrocarbon Generation in Overmature Coal-Measure Source Rocks of the Southern Ordos Basin.

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Title: Late-Stage Hydrocarbon Generation in Overmature Coal-Measure Source Rocks of the Southern Ordos Basin.
Authors: Zhang, Yuehui1 (AUTHOR), Ye, Jiaren1,2 (AUTHOR), Qi, Rong2,3 (AUTHOR), Zhang, Wei1,2 (AUTHOR), Cao, Qiang1,2 (AUTHOR) qcao@cug.edu.cn, Xiao, Qian3 (AUTHOR)
Source: Energies (19961073). Jun2026, Vol. 19 Issue 12, p2946. 21p.
Subject Terms: *Natural gas, *Geological modeling, *Geological formations, *Geochemical modeling
Abstract: The Permian Taiyuan and Shanxi Formations of the Upper Paleozoic in the Ordos Basin are the primary source rock sequences for tight sandstone gas. The core problem lies in the uncertainty surrounding the gas generation process at the overmature stage. To clarify hydrocarbon generation processes and the potential of coal, carbonaceous mudstone and dark mudstone, we integrate basin modeling and hydrocarbon generation pyrolysis thermal simulation experiments. Using PetroMod software and measured well data on vitrinite reflectance (Ro), total organic carbon (TOC), Tmax and hydrocarbon generation potential (S1 + S2), we quantitatively reconstruct the burial, thermal, maturity and hydrocarbon evolution histories of the southern Ordos Basin. The results indicate that the main oil generation window is concentrated at 400 °C, and gas yield increases continuously from 350 °C to 700 °C without a peak, showing that coal and carbonaceous mudstone still have considerable hydrocarbon generation potential under extreme high-temperature conditions. Combining the hydrocarbon generation ratio, rock density and TOC data, coal is identified as the predominant source rock in the southern Ordos Basin. This study provides a scientific basis for tight gas exploration in cratonic basins, enhances the understanding of gas generation in coal-bearing source rocks, and offers a new perspective for oil and gas resource evaluation. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 194909395
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Late-Stage Hydrocarbon Generation in Overmature Coal-Measure Source Rocks of the Southern Ordos Basin.
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  Data: <searchLink fieldCode="AR" term="%22Zhang%2C+Yuehui%22">Zhang, Yuehui</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ye%2C+Jiaren%22">Ye, Jiaren</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Qi%2C+Rong%22">Qi, Rong</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Wei%22">Zhang, Wei</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Cao%2C+Qiang%22">Cao, Qiang</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> qcao@cug.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Xiao%2C+Qian%22">Xiao, Qian</searchLink><relatesTo>3</relatesTo> (AUTHOR)
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  Label: Source
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  Data: <searchLink fieldCode="JN" term="%22Energies+%2819961073%29%22">Energies (19961073)</searchLink>. Jun2026, Vol. 19 Issue 12, p2946. 21p.
– Name: Subject
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  Data: *<searchLink fieldCode="DE" term="%22Natural+gas%22">Natural gas</searchLink><br />*<searchLink fieldCode="DE" term="%22Geological+modeling%22">Geological modeling</searchLink><br />*<searchLink fieldCode="DE" term="%22Geological+formations%22">Geological formations</searchLink><br />*<searchLink fieldCode="DE" term="%22Geochemical+modeling%22">Geochemical modeling</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The Permian Taiyuan and Shanxi Formations of the Upper Paleozoic in the Ordos Basin are the primary source rock sequences for tight sandstone gas. The core problem lies in the uncertainty surrounding the gas generation process at the overmature stage. To clarify hydrocarbon generation processes and the potential of coal, carbonaceous mudstone and dark mudstone, we integrate basin modeling and hydrocarbon generation pyrolysis thermal simulation experiments. Using PetroMod software and measured well data on vitrinite reflectance (Ro), total organic carbon (TOC), Tmax and hydrocarbon generation potential (S1 + S2), we quantitatively reconstruct the burial, thermal, maturity and hydrocarbon evolution histories of the southern Ordos Basin. The results indicate that the main oil generation window is concentrated at 400 °C, and gas yield increases continuously from 350 °C to 700 °C without a peak, showing that coal and carbonaceous mudstone still have considerable hydrocarbon generation potential under extreme high-temperature conditions. Combining the hydrocarbon generation ratio, rock density and TOC data, coal is identified as the predominant source rock in the southern Ordos Basin. This study provides a scientific basis for tight gas exploration in cratonic basins, enhances the understanding of gas generation in coal-bearing source rocks, and offers a new perspective for oil and gas resource evaluation. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.3390/en19122946
    Languages:
      – Code: eng
        Text: English
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        PageCount: 21
        StartPage: 2946
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        Type: general
      – SubjectFull: Geological modeling
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      – SubjectFull: Geological formations
        Type: general
      – SubjectFull: Geochemical modeling
        Type: general
    Titles:
      – TitleFull: Late-Stage Hydrocarbon Generation in Overmature Coal-Measure Source Rocks of the Southern Ordos Basin.
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            NameFull: Zhang, Yuehui
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            NameFull: Ye, Jiaren
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            NameFull: Qi, Rong
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            NameFull: Zhang, Wei
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            NameFull: Cao, Qiang
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            NameFull: Xiao, Qian
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            – D: 15
              M: 06
              Text: Jun2026
              Type: published
              Y: 2026
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              Value: 19
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              Value: 12
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            – TitleFull: Energies (19961073)
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