| Citation: | ZHANG Bing，BIE Shizhen，MI Honggang，et al. Impact of coal-forming environment of Shanxi Formation in Late Paleozoic of North China Platform on coal seam gas-bearing property[J]. Bulletin of Geological Science and Technology，2026，45（3）：1-12 doi: 10.19509/j.cnki.dzkq.tb20240769
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The coal-forming environment plays a pivotal role in coalbed methane enrichment, with previous studies primarily focusing on specific mining areas and coalbed methane blocks. These studies have typically examined the influence of the coal-forming environment on coal seam gas-bearing property from the perspectives of sedimentary environment and coal facies within limited geographic scopes. However, a comprehensive and systematic overview of the overall influence of the coal-forming environment on gas-bearing property, particularly in North China Craton, has been lacking. This research, centered on the North China Craton, aims to address this gap by systematically analyzing the coal-forming environment and gas characteristics of the Shanxi Formation coal seams.
Based on coal facies and gas content data from the Shanxi Formation coal seams, together with measured data, the study comprehensively summarized the Late Paleozoic coal-forming environment and gas-bearing characteristics of the Shanxi Formation on the North China Platform and explored the impact of the environment on gas-bearing property in coal seams.
The results indicated that the strata of the Shanxi Formation in North China were formed during marine regression, with the shoreline retreating toward the southeast. The coal-forming sequence was categorized into five sedimentary assemblages: Alluvial fan-braided river deposits → meandering river-lacustrine deposits → deltaic deposits → clastic shoreline deposits → coastal shallow-marine carbonate and clastic deposits. The gas-bearing-property in the Shanxi Formation exhibited distinct characteristics across different sedimentary assemblages, with higher gas content observed in coal seams formed under deltaic and clastic coastal depositional environments. The coal-forming environment significantly influences coal seam gas-bearing property by affecting coal seam thickness, coal quality, and the lithology and thickness of the roof and floor strata. Generally, higher coalbed methane content is associated with thicker coal seams, higher vitrinite content, lower ash content, denser lithology, and greater thickness of roof and floor strata, as well as a more favorable sealing capacity in the coal-bearing basin. Coal facies parameters, which reflect variations in environmental factors such as hydrodynamic conditions and oxygen levels, along with vertical heterogeneity in coal quality, contribute to differences in gas-bearing property. Peat swamps with high gelation index (
The research results can provide theoretical references for the exploration and deployment of coalbed methane resources in North China.
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