基于图像的煤层气储层三维异质孔隙结构定量探测以及孔隙网络模型的渗透率估算

IF 6.9 1区 工程技术 Q2 ENERGY & FUELS
Peng Liu, Yulong Zhao, Zhengduo Zhao, Huiming Yang, Baisheng Nie, Hengyi He, Quangui Li, Guangjie Bao
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引用次数: 0

摘要

煤层气储量巨大,低碳燃烧对环境有益,因此煤层气回收备受全球关注。充分了解煤的复杂结构及其传输特性对于煤层气开发至关重要。本研究介绍了采用汞侵入和μ-CT技术对两种无烟煤的三维孔隙结构进行定量分析。结果表明,煤样 1 和煤样 2 的孔隙度分别为 7.04%-8.47% 和 10.88%-12.11%,孔隙连通性分别为 0.5422-0.6852 和 0.7948-0.9186。根据三维孔隙结构获得的数据计算了分形维数和孔隙几何迂回度。结果表明,煤样 2 的孔隙结构更复杂、更发达,孔隙几何扭曲度更低,这表明煤样 2 的孔隙系统具有更高的流体输送能力。三维方向的曲折度差异显著,表明所研究煤炭的孔隙结构具有明显的各向异性。提取了等效孔隙网络模型(PNM),并通过 PNM 气体流动模拟估算了各向异性渗透率。结果表明,渗透率的各向异性与三维孔隙结构中的切片表面孔隙度分布一致。水平方向的渗透率远大于垂直方向的渗透率,表明所研究煤炭的主要运输通道是沿水平方向的。该研究成果实现了煤炭三维复杂结构的可视化,在微米级分辨率下全面捕捉并量化了孔隙尺寸、连通性、曲率、渗透率及其各向异性特征。这为研究实际孔隙结构中的传质行为和相关传输机制提供了先决条件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Image-based quantitative probing of 3D heterogeneous pore structure in CBM reservoir and permeability estimation with pore network modeling

Image-based quantitative probing of 3D heterogeneous pore structure in CBM reservoir and permeability estimation with pore network modeling

Coalbed methane (CBM) recovery is attracting global attention due to its huge reserve and low carbon burning benefits for the environment. Fully understanding the complex structure of coal and its transport properties is crucial for CBM development. This study describes the implementation of mercury intrusion and μ-CT techniques for quantitative analysis of 3D pore structure in two anthracite coals. It shows that the porosity is 7.04%–8.47% and 10.88%–12.11%, and the pore connectivity is 0.5422–0.6852 and 0.7948–0.9186 for coal samples 1 and 2, respectively. The fractal dimension and pore geometric tortuosity were calculated based on the data obtained from 3D pore structure. The results show that the pore structure of sample 2 is more complex and developed, with lower tortuosity, indicating the higher fluid deliverability of pore system in sample 2. The tortuosity in three-direction is significantly different, indicating that the pore structure of the studied coals has significant anisotropy. The equivalent pore network model (PNM) was extracted, and the anisotropic permeability was estimated by PNM gas flow simulation. The results show that the anisotropy of permeability is consistent with the slice surface porosity distribution in 3D pore structure. The permeability in the horizontal direction is much greater than that in the vertical direction, indicating that the dominant transportation channel is along the horizontal direction of the studied coals. The research results achieve the visualization of the 3D complex structure of coal and fully capture and quantify pore size, connectivity, curvature, permeability, and its anisotropic characteristics at micron-scale resolution. This provides a prerequisite for the study of mass transfer behaviors and associated transport mechanisms in real pore structures.

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来源期刊
CiteScore
11.40
自引率
8.40%
发文量
678
审稿时长
12 weeks
期刊介绍: The International Journal of Coal Science & Technology is a peer-reviewed open access journal that focuses on key topics of coal scientific research and mining development. It serves as a forum for scientists to present research findings and discuss challenging issues in the field. The journal covers a range of topics including coal geology, geochemistry, geophysics, mineralogy, and petrology. It also covers coal mining theory, technology, and engineering, as well as coal processing, utilization, and conversion. Additionally, the journal explores coal mining environment and reclamation, along with related aspects. The International Journal of Coal Science & Technology is published with China Coal Society, who also cover the publication costs. This means that authors do not need to pay an article-processing charge.
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