利用计算机断层扫描评估孔隙-断裂结构对构造煤渗透敏感性的影响

IF 1.8 3区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Guangui Zou, Meijiao Wang, Tailang Zhao, Jiasheng She
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引用次数: 0

摘要

煤储层渗透率的异质性主要归因于微观孔隙裂缝在复杂地质过程中形成的形态和结构的巨大变化。本研究强调有必要了解不同类型煤体中孔隙裂缝的形态和结构变化对其渗透性的影响和治理。利用计算机层析成像扫描和三维成像技术,我们对山西省沁水盆地东南部大同煤田的煤样进行了研究,根据层析成像数据描述了不同煤体类型的孔隙裂隙形态和结构特征。本文介绍了一种评估孔隙率、比表面积、曲折度和分形维度等微观孔隙-断裂参数对渗透率敏感性影响的方法。这是通过应用修正的 Kozeny-Carman 方程和分形渗透率模型来实现的。研究结果表明,原煤中以板状裂缝为主,而在弱脆性变形条件下的碎煤则表现出直径和体积极小、连通性差的孤立小孔隙裂缝。与此相反,受强脆性变形作用的粒状煤则具有直径和体积较大的大孔隙裂缝群,增强了连通性。此外,通过将修正的 Kozeny-Carman 方程与层析成像数据相结合,对渗透性预测进行了改进,从而更精确地了解了不同煤体的渗透性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Assessing the impact of pore-fracture structures on permeability sensitivity in tectonic coal using computerized tomography scanning

The heterogeneity in permeability of coal reservoirs is primarily attributed to the considerable variation in the morphologies and structures of microscopic pore-fractures, shaped by complex geological processes. This study emphasizes the necessity of understanding the impact and governance of these morphological and structural variations in pore-fractures across different types of coal bodies on their permeability. Utilizing computerized tomography scanning and three-dimensional imaging, we examined coal samples from the Datong coalfield in the southeastern Qinshui Basin, Shanxi Province, to characterize the pore-fracture morphologies and structures distinct to various coal-body types based on tomographic data. This introduces a methodology for assessing the influence of microscopic pore-fracture parameters, such as porosity, specific surface area, tortuosity and fractal dimension, on permeability sensitivity. This is achieved through the application of the modified Kozeny–Carman equation and a fractal permeability model. Findings indicate a predominance of slab fractures in raw coal, whereas fragmented coal under weak brittle deformation exhibits small, isolated pore-fractures with minimal diameter and volume and poor connectivity. In contrast, granular coal subjected to strong brittle deformation features extensive clusters of large pore-fractures with significant diameter and volume, enhancing connectivity. Moreover, permeability predictions are refined by integrating the modified Kozeny–Carman equation with tomographic data, offering a more precise understanding of the permeability across different coal bodies.

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来源期刊
Geophysical Prospecting
Geophysical Prospecting 地学-地球化学与地球物理
CiteScore
4.90
自引率
11.50%
发文量
118
审稿时长
4.5 months
期刊介绍: Geophysical Prospecting publishes the best in primary research on the science of geophysics as it applies to the exploration, evaluation and extraction of earth resources. Drawing heavily on contributions from researchers in the oil and mineral exploration industries, the journal has a very practical slant. Although the journal provides a valuable forum for communication among workers in these fields, it is also ideally suited to researchers in academic geophysics.
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