淮北矿区岩浆—热演化与页岩气富集的关系*

doi:10.7523/j.ucas.2025.044

摘要/Abstract

摘要： 华北陆块南部岩浆—热演化作用与煤系页岩气富集的关系长期存在争议,制约了该区域页岩气勘探的突破。本文以淮北矿区为例,通过盆地数值模拟、二氧化碳吸附和甲烷等温吸附实验,系统揭示岩浆热事件对页岩气生成—赋存—保存的全过程正向调控作用。研究表明：（1）晚古生代至中生代构造沉降与岩浆热事件（热流峰值130 mW/m²）显著加速了二叠系煤系页岩的有机质热演化,导致二叠系山西组与下石盒子组煤系页岩成熟度显著跃升（R_o值达1.63%与1.45%）,促使重质油热解转化为轻质油和湿气;（2）岩浆侵入产生的热量导致煤系孔隙结构显著改变,靠近岩浆岩体的页岩微孔体积和比表面积增大2倍以上,甲烷吸附量（V_L=2.18 cm³/g）较未受热区（V_L=0.99 cm³/g）提升1倍;（3）华北克拉通破坏对页岩气富集具双重控制：岩浆热事件通过加速生烃与孔隙优化促进富集,但后期构造抬升与断层活动导致气藏逸散。综合构造—热演化特征,弱构造变形区叠加早白垩世岩浆侵入的区域（如宿县—临涣区块）被识别为页岩气有利勘探靶区。本研究为克拉通破坏区页岩气勘探提供了地质演化动态耦合机制的理论依据。

关键词: 华北陆块南部, 淮北矿区, 岩浆—热演化, 煤系页岩气, 华北克拉通破坏

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 (R_ovalues 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 (V_L=2.18 cm³/g) doubling compared to that in the unheated area (V_L=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

中图分类号:

TE122

王鹏, 琚宜文, 肖蕾, 王巍, 陶丽茹, 高健, 陈韧哲, 管裴云. 淮北矿区岩浆—热演化与页岩气富集的关系^*[J]. 中国科学院大学学报, DOI: 10.7523/j.ucas.2025.044.

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, DOI: 10.7523/j.ucas.2025.044.

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淮北矿区岩浆—热演化与页岩气富集的关系^*

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

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