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<p>The Late Mesozoic coal-bearing strata on the eastern margin of the Shuangyashan Basin are significant potential sources of coal-derived gas resources; however, their complex structural evolution’s influence on the gas accumulation process is not yet fully understood. This study aims to investigate both the generation and evolution processes of coal-derived gas in the region and the key factors that control them by employing a combination of organic geochemical analysis, PetroMod basin modeling, and methane isothermal adsorption experiments, allowing us to systematically examine the factors that influence coal-derived gas generation and evolution. Geochemical data indicate that the coal-bearing strata are characterized by a high abundance of organic matter, are mature to highly mature, and are primarily composed of gas-prone Type III kerogen, providing a high-quality source for efficient coal-derived gas generation. Basin modeling clearly illustrates two critical structural–thermal events: Early Cretaceous rapid subsidence caused the coal-bearing strata to reach the hydrocarbon generation threshold and attain moderate maturity, while intense magmatic thermal events during the Late Cretaceous Yanshan period (with the peak geothermal heat flow reaching 91.5 mW/m<sup>2</sup>) resulted in a rapid increase in organic matter maturity, quickly approaching peak gas generation—with both of these events serving as the core triggers for efficient coal-derived gas generation. Methane isothermal adsorption experiments further demonstrate that the coal seams in the study area exhibit both high methane adsorption capacity and low critical desorption pressure, indicating good extractability. This study quantitatively reconstructs the key role of structural–thermal evolution in coal-derived gas generation, emphasizing the dominant influence of Late Cretaceous magmatic thermal events in enhancing resource potential and exploration prospects, as well as providing a scientific foundation for selecting and developing coal-derived gas exploration target areas in the eastern Shuangyashan Basin.</p>

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Geological Processes of Late Mesozoic Coal-Derived Gas Formation on the Eastern Shuangyashan Basin: Geochemical and Modeling Insights

  • 期刊论文

  • 发表日期：

    2026年3月16日

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  • Hanyu Zhang,
  • Yanming Zhu,
  • Yang Wang,
  • Yiming Zhao,
  • Zhixuan Wang,
  • Yao Ge,
  • Haoran Chen

摘要

The Late Mesozoic coal-bearing strata on the eastern margin of the Shuangyashan Basin are significant potential sources of coal-derived gas resources; however, their complex structural evolution’s influence on the gas accumulation process is not yet fully understood. This study aims to investigate both the generation and evolution processes of coal-derived gas in the region and the key factors that control them by employing a combination of organic geochemical analysis, PetroMod basin modeling, and methane isothermal adsorption experiments, allowing us to systematically examine the factors that influence coal-derived gas generation and evolution. Geochemical data indicate that the coal-bearing strata are characterized by a high abundance of organic matter, are mature to highly mature, and are primarily composed of gas-prone Type III kerogen, providing a high-quality source for efficient coal-derived gas generation. Basin modeling clearly illustrates two critical structural–thermal events: Early Cretaceous rapid subsidence caused the coal-bearing strata to reach the hydrocarbon generation threshold and attain moderate maturity, while intense magmatic thermal events during the Late Cretaceous Yanshan period (with the peak geothermal heat flow reaching 91.5 mW/m2) resulted in a rapid increase in organic matter maturity, quickly approaching peak gas generation—with both of these events serving as the core triggers for efficient coal-derived gas generation. Methane isothermal adsorption experiments further demonstrate that the coal seams in the study area exhibit both high methane adsorption capacity and low critical desorption pressure, indicating good extractability. This study quantitatively reconstructs the key role of structural–thermal evolution in coal-derived gas generation, emphasizing the dominant influence of Late Cretaceous magmatic thermal events in enhancing resource potential and exploration prospects, as well as providing a scientific foundation for selecting and developing coal-derived gas exploration target areas in the eastern Shuangyashan Basin.