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基于煤微孔与纳米孔结构演化的甲烷“固-液-气”转化机制研究

Study on the mechanism of methane "solid-liquid-gas" conversion controlled by the evolution of coal micro- and nanopore structure.

作者信息

Sui Hao, Li Xijian, Cai Junjie, Deng Sen, Xu Enyu, Xue Feng, Xie Honggao

机构信息

College of Resource and Environmental Engineering, Guizhou University, Guiyang, 550025, China.

Mining College, Guizhou University, Guiyang, 550025, China.

出版信息

Sci Rep. 2024 May 20;14(1):11473. doi: 10.1038/s41598-024-62193-x.

DOI:10.1038/s41598-024-62193-x
PMID:38769099
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11106246/
Abstract

Currently, the utilization of coalbed methane resources in the Guizhou region faces challenges such as complex reservoir structure, high gas content, and microporous development. Based on these, the pore structure and adsorption capacity of Guizhou tectonic deformed coals (TDCs) were evaluated using a suite of integrated diagnostic techniques including low-temperature nitrogen adsorption (LT-NA), mercury intrusion porosimetry (MIP), methane isothermal adsorption. Through the above methods, the pore structure and adsorption characteristics of the samples were characterized; The samples were divided into the range of joint pores by combining the results of MIP and LT-NA; Using the molecular simulation software, the 2 nm, 4 nm, 10 nm pores affecting the methane endowment state were investigated respectively, and from the perspective of the heat of adsorption and energy, the concept of the three-phase transition of methane was proposed, and explore the change of the pore spacing affecting the endowment state of methane from the solid state pore to the gas state pore. The results provide new ideas for the in-depth study of gas storage in tectonic coal reservoirs in Guizhou Province.

摘要

目前，贵州地区煤层气资源的开发利用面临着储层构造复杂、瓦斯含量高、微孔发育等难题。基于此，采用低温氮吸附（LT - NA）、压汞法（MIP）、甲烷等温吸附等一系列综合诊断技术，对贵州构造变形煤（TDC）的孔隙结构和吸附能力进行了评价。通过上述方法，对样品的孔隙结构和吸附特性进行了表征；结合MIP和LT - NA的结果，将样品划分为裂隙孔隙范围；利用分子模拟软件，分别研究了影响甲烷赋存状态的2nm、4nm、10nm孔隙，从吸附热和能量的角度，提出了甲烷三相转变的概念，并探讨了从固态孔隙到气态孔隙影响甲烷赋存状态的孔隙间距变化。研究结果为贵州省构造煤储层瓦斯赋存的深入研究提供了新思路。

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