低温灰化反演页岩纳米孔隙来源方法探究

宋党育; 杨春林; 李云波; 乔雨

doi:10.3969/j.issn.1006-6535.2025.04.003

特种油气藏 >

2025 , Vol. 32 >Issue 4: 25 - 32

DOI: https://doi.org/10.3969/j.issn.1006-6535.2025.04.003

地质勘探

低温灰化反演页岩纳米孔隙来源方法探究

宋党育 ,
杨春林 ,
李云波 ,
乔雨

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河南理工大学,河南焦作 454000

宋党育(1971—),男,教授,博士生导师,1994年毕业于中国矿业大学煤田地质专业,2003年毕业于该校地球探测与信息技术专业,获博士学位,现主要从事煤层气(瓦斯)地质、煤地球化学方面的研究工作。

收稿日期: 2024-09-15

修回日期: 2025-05-01

网络出版日期: 2025-09-03

基金资助

国家自然科学基金联合基金面上项目“吸附速率对煤层中CO₂注入效率的控制机理”(42272210)

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Investigation on inversion methods for tracing the sources of shale nanopores via low-temperature ashing

SONG Dangyu ,
YANG Chunlin ,
LI Yunbo ,
QIAO Yu

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Henan Polytechnic University, Jiaozuo, Henan 454000, China

Received date: 2024-09-15

Revised date: 2025-05-01

Online published: 2025-09-03

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摘要

针对传统方法在研究页岩纳米孔隙来源时存在局限性的问题,开展低温灰化实验,分析灰化过程中孔隙的变化与转化规律,建立了页岩微孔与介孔的有机、无机来源反演方法,并通过低温灰化反演方法对鄂尔多斯盆地东缘海陆过渡相页岩纳米孔隙的有机、无机来源进行分析。研究结果表明:有机质对微孔孔容和比表面积的平均贡献率分别为45.77%和44.62%,对介孔孔容与比表面积的平均贡献率分别为7.77%和12.85%,有机质微孔与介孔的孔容与比表面积约为无机质微孔与介孔的18.0倍和1.7倍;与传统的相关性分析方法相比,低温灰化反演法克服了有机质中孔隙非均质性对分析结果的影响,能够有效统计每个样品中有机质孔隙来源的真实量;页岩微孔与介孔的来源主要受控于有机质含量,且受控制程度在微孔中表现得更为明显。低温灰化反演方法的建立对深入了解页岩气的储集机制、游离态甲烷含量及释放效率具有重要意义。

关键词： 低温灰化实验; 孔隙来源; 反演法; 线性回归; 孔隙转化

本文引用格式

宋党育 , 杨春林 , 李云波 , 乔雨 . 低温灰化反演页岩纳米孔隙来源方法探究[J]. 特种油气藏, 2025 , 32(4) : 25 -32 . DOI: 10.3969/j.issn.1006-6535.2025.04.003

Abstract

To address the limitations of traditional methods in studying shale nanopore sources,low-temperature ashing experiments were conducted.This study analyzed pore changes and transformation during ashing,established an inversion method for tracing organic and inorganic sources of shale micropores and mesopores,and applied such method to analyze the organic and inorganic sources of nanopores in marine-continental transitional shales at the eastern margin of the Ordos Basin.The study results show that organic matter contributes on average 45.77% to micropore volume and 44.62% to specific surface area,and 7.77% to mesopore volume and 12.85% to specific surface area.Organic micropores and mesopores are approximately 18.0 and 1.7 times larger than inorganic ones.Compared with the traditional correlation analysis method,the low-temperature ashing inversion method overcomes the influence of pore heterogeneity in organic matter on the analysis results,and is able to effectively quantify the true pore source of organic matter in each sample;the source of the shale′s micropores and mesopores is mainly controlled by the content of organic matter,with a more pronounced effect on micropores.This method enhances our understanding of shale gas storage mechanisms,free methane content,and release efficiency.

Key words： low-temperature ashing experiment; pore source; inversion method; linear regression; pore transformation

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