Co-evolution mechanism of macromolecular structure and pore structure in deep coal-rock:a case study of the Carboniferous Benxi Formation in Ordos Basin

Xu Wanglin; Zhao Zhenyu; Hu Jianling; Shao Yan; Shi Yunhe; Zhang Yueqiao; Fang Xiang; Sun Yuanshi; Liu Yu

doi:10.7623/syxb202510005

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Co-evolution mechanism of macromolecular structure and pore structure in deep coal-rock:a case study of the Carboniferous Benxi Formation in Ordos Basin

更新时间：2025-11-08

- Co-evolution mechanism of macromolecular structure and pore structure in deep coal-rock:a case study of the Carboniferous Benxi Formation in Ordos Basin
- ACTA PETROLEI SINICA Vol. 46, Issue 10, Pages: 1892-1905(2025)
- 作者机构：
  
  1. 中国石油勘探开发研究院,北京,100083
  2. 中国石油长庆油田公司勘探开发研究院,陕西,西安,710018
  3. 中国矿业大学(北京)地球科学与测绘工程学院,北京,100083
- 作者简介：
- 基金信息：
- DOI：10.7623/syxb202510005
  CLC： TE122.2
- Published Online：04 November 2025，
  
  Published：04 November 2025
- 稿件说明：
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徐旺林, 赵振宇, 虎建玲, 邵燕, 史云鹤, 张月巧, 方向, 孙远实, 刘宇. 深部煤岩大分子结构与孔隙结构协同演化机制——以鄂尔多斯盆地石炭系本溪组为例[J]. 石油学报, 2025, 46(10): 1892-1905.

Xu Wanglin, Zhao Zhenyu, Hu Jianling, et al. Co-evolution mechanism of macromolecular structure and pore structure in deep coal-rock:a case study of the Carboniferous Benxi Formation in Ordos Basin[J]. Acta petrolei sinica, 2025, 46(10): 1892-1905.
徐旺林, 赵振宇, 虎建玲, 邵燕, 史云鹤, 张月巧, 方向, 孙远实, 刘宇. 深部煤岩大分子结构与孔隙结构协同演化机制——以鄂尔多斯盆地石炭系本溪组为例[J]. 石油学报, 2025, 46(10): 1892-1905. DOI： 10.7623/syxb202510005.

Xu Wanglin, Zhao Zhenyu, Hu Jianling, et al. Co-evolution mechanism of macromolecular structure and pore structure in deep coal-rock:a case study of the Carboniferous Benxi Formation in Ordos Basin[J]. Acta petrolei sinica, 2025, 46(10): 1892-1905. DOI： 10.7623/syxb202510005.

摘要

鄂尔多斯盆地深部煤岩气(部分学者称之为深部煤层气)勘探实现万亿立方米级储量规模突破

其资源的赋存主要受煤岩大分子结构-孔隙结构协同演化机制控制。为揭示这一机制

选取成熟度连续分布的煤样[镜质体反射率(R

)为1.03%~1.96%

]

综合运用

C核磁共振谱、傅里叶变换红外光谱(FTIR)、高压压汞和N

/CO

吸附实验开展了多尺度煤岩大分子结构和孔隙结构表征。研究结果表明:①随着R

从1.03%增至1.96%

芳香碳含量由61.56%上升至69.72%

脂肪碳含量则从28.96%降至16.77%

FTIR谱图显示芳香结构的特征峰增强而脂肪族结构的特征峰减弱;②微孔作为煤岩气的核心吸附空间

贡献了85.32%~96.50%的孔体积和99%以上的比表面积

由此成为甲烷的主要赋存场所;③煤岩大分子结构-孔隙结构协同演化表现为脂肪链断裂与含氧官能团脱落抑制了介孔的发育

而芳构化与环缩合作用则促使微孔在芳香层片边缘富集

导致微孔的孔体积与芳香碳含量呈现出显著的正相关关系

介孔的孔体积则与脂肪碳含量呈正相关。研究揭示了深部煤岩储层"脂肪族结构裂解—芳香环缩合—微孔发育"的定向演化机制

为深层煤岩气"甜点"预测提供了理论支撑。

Abstract

A breakthrough has been achieved in exploration of the trillion-cubic-meter-scale reserves of deep coal-rock gas(some scholars call it as deep coalbed methane) in Ordos Basin. The resource occurrence is primarily controlled by the co-evolution mechanism of macromolecular structure and pore structure in coal-rock. To elucidate this mechanism

coal samples with a co

ntinuous maturity [vitrinite reflectance (R

)ranging from 1.03 % to 1.96 %

]

were selected. A comprehensive multi-scale characterization of coal-rock macromolecular structure and pore structure was conducted using

C nuclear magnetic resonance spectroscopy

Fourier-transform infrared spectrometry (FTIR)

high-pressure mercury intrusion test

and N

/CO

adsorption experiments. The research results show as follows. (1)As R

increases from 1.03 % to 1.96 %

the aromatic carbon content rises from 61.56 % to 69.72 %

while the aliphatic carbon content decreases from 28.96 % to 16.77 % . FTIR spectra reveal enhanced characteristic peaks of the aromatic structure and weakened characteristic peaks of the aliphatic structure. (2)Micropores

as the core adsorption space for coal-rock gas

contribute 85.32 % to 96.50 % of the pore volume and more than 99 % of the specific surface area

thus becoming the main occurrence site of methane. (3)The co-evolution of macromolecular structure and pore structure in coal-rock is manifested in the suppression of mesopore development by the breaking of aliphatic chains and the removal of oxygen-containing functional groups

while both aromatization and cyclization promote the accumulation of micropores at the edges of aromatic layers. This results in a significant positive correlation between micropore volume and aromatic carbon content

while mesopore volume shows a positive correlation with aliphatic carbon content. The study discovers the directional evolution mechanism of deep coal-rock reservoirs

characterized by aliphatic structure cracking

aromatic ring cyclization

and micropore development

providing theoretical support for the prediction of deep coal-rock gas "sweet spots".

关键词

Keywords

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