Work

Influence of Pore Structure and Basic Coal Properties on Gas Efficient Desorption Capacity in Coal

Year: 2025

Type: article

Abstract: The gas desorption capacity is beneficial for predicting and optimizing gas recovery from coalbed methane reserves. In this study, coal samples were collected from the southern Qinshui Basin. The isothermal adsorption experiment and mercury injection capillary pressure test were adopted to study the gas desorption capacity and pore structure. The efficient desorption capacity definition was proposed to evaluate the efficient desorption stage. The results show that the micropores and transition pores are well developed in all of the coal samples. There are two fractal dimensions in coal: the percolation fractal dimension (D1) and the diffusion fractal dimension (D2). A larger pore volume and well-connected pore network facilitate efficient desorption and transport of methane, leading to an enhanced methane yield. D1 is positively correlated with efficient desorption capacity, while D2 has a weaker effect. In addition, the basic properties of coal samples, such as coal rank, vitrinite content, and inertinite content, also have a certain effect on the efficient desorption capacity, but the relationship is not clear. These findings enhance our understanding of coalbed methane desorption capacity.

Source: ACS Omega

DOI: 10.1021/acsomega.4c10950

Authors: Zhenfeng Yu, Jianping Bai, Jindong Yang, Lei Han

Institutions: China University of Mining and Technology, Henan Polytechnic University

Language: English

Topic: Coal Properties and Utilization

Subfield: Ocean Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,935

Funders: Henan Polytechnic University, Foundation of Henan Educational Committee, Natural Science Foundation of Henan Province, Shanxi Provincial Key Research and Development Project