What is it about?
The heterogeneity and anisotropy of the pore structure of coal reservoirs are the key geological factors that restrict the efficient exploitation of natural gas. To solve this problem, an innovative characterization method of coal pore connectivity anisotropy is proposed in this study, and the implementation steps and verification results of this method are introduced.
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Why is it important?
The proposed method can not only characterize the pore connectivity of the same macrolithotype of coal in different directions but also ensure the accurate characterization of nanopores in coal, thereby enabling a deeper understanding of the anisotropic characteristics of pore connectivity. The pore types in the bedding-parallel direction are diverse, with porosity and permeability more than several times those in the bedding-normal direction. However, there are also more dead-end pores with larger pore sizes in the bedding-parallel direction, which exhibits strong anisotropy in the different directions of bedding-parallel.
Perspectives
I hope this article can stimulate readers' strong interest in coal geology and unconventional oil and gas development geology. Given that coalbed methane is an indispensable source of natural gas supply, it plays a crucial role in our daily lives and brings us many conveniences. However, the complex structure of coal poses numerous challenges to resource development. By deeply analyzing the structural characteristics of coal reservoirs, theoretical support can be provided for optimizing mining processes. I hope everyone can enhance their understanding of coal resources and the challenges faced in the development process, and contribute to the progress and development of this field together.
Qingmin Shi
Xi'an University of Science and Technology
Read the Original
This page is a summary of: Anisotropy of coal pore connectivity: Experiments based on low-field nuclear magnetic resonance and low-temperature nitrogen adsorption, Geophysics, March 2025, Society of Exploration Geophysicists,
DOI: 10.1190/geo2023-0379.1.
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