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DOI: https://doi.org/10.7523/j.ucas.2025.044

Relationship between magmatic—thermal evolution and shale gas enrichment in huaibei mining area

  • Wang Peng ,
  • Ju Yiwen ,
  • Xiao Lei ,
  • Wang Wei ,
  • Tao Liru ,
  • Gao Jian ,
  • Chen Renzhe ,
  • Guan Peiyun
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  • Key Laboratory of Earth System Numerical Modeling and Application, College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China

Received date: 2025-04-24

  Revised date: 2025-07-03

  Online published: 2025-07-17

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Abstract

The relationship between magmatic—thermal evolutionary action and coal measures shale gas enrichment in the southern part of the North China block has long been controversial, constraining breakthroughs in deep energy exploration in the region. Taking huaibei mining area as an example, this paper systematically reveals the role of magmatic thermal events in positively regulating the whole process of shale gas generation—endowment—preservation through numerical simulation of the basin, carbon dioxide adsorption and methane isothermal adsorption experiments. The study shows that: (1) Late paleozoic to mesozoic tectonic subsidence and magmatic thermal events (peak heat flow of 130 mW/m²) significantly accelerated the thermal evolution of organic matter in permian coal shales, which led to a jump in the maturity of shales in the shanxi formation and the lower shihezi formation (Ro values up to 1.63% and 1.45%), and drove the pyrolysis of heavy oils into lighter oils and wet gases; (2) The heat generated by the magma intrusion led to significant changes in the pore structure of the coal system, with the microporous volume and specific surface area of the shale close to the magma body more than tripling, and the methane adsorption (VL=2.18 cm³/g) doubling compared to that in the unheated area (VL=0.99 cm³/g); (3) The disruption of the North China craton has a dual control on shale gas enrichment: the magmatic—thermal event promotes enrichment by accelerating hydrocarbon production and pore optimisation, but later tectonic uplift and faulting activities lead to the escape of the gas reservoir. Combining the tectonic—thermal evolution characteristics, areas of weak tectonic deformation superimposed on early cretaceous magmatic intrusion (e.g., Suxian—Linluan block) are identified as favourable shale gas exploration target areas. This study provides a theoretical basis for the dynamic coupling mechanism of geological evolution for shale gas exploration in the craton destruction zone.

Key words： southern part of the North China block; huaibei mining area; magmatic—thermal evolution; coal measures shale gas; destruction of the North China craton

Cite this article

Wang Peng , Ju Yiwen , Xiao Lei , Wang Wei , Tao Liru , Gao Jian , Chen Renzhe , Guan Peiyun . Relationship between magmatic—thermal evolution and shale gas enrichment in huaibei mining area[J]. Journal of University of Chinese Academy of Sciences, 0 : 44 . DOI: 10.7523/j.ucas.2025.044

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