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首页> 外文期刊>International Journal of Oil, Gas and Coal Engineering >Application of Low Pressure Nsub2sub Adsorption on Shale Nanoscale Pore Structure: Examples from the Permian Shanxi Formation of Transitional Facies Shale
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Application of Low Pressure Nsub2sub Adsorption on Shale Nanoscale Pore Structure: Examples from the Permian Shanxi Formation of Transitional Facies Shale

机译：低压N 2 吸附在页岩纳米级孔隙结构中的应用：以过渡相页岩二叠系山西组为例

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摘要

Shale gas resources in transitional facies are important unconventional energy sources. In order to understand the seepage characteristics of shale reservoir, low pressure nitrogen adsorption experiment were applied to investigate the nanoscale pore structure and adsorption fractal characteristics of shale in Shanxi Formation. FHH fractal model was adopted to calculate the absorption pore fractal dimension values D and quantitatively confirm the relationship between fractal dimension values and pore parameters. Results show that distribution curve obtained by the desorption branch present pore size distribution ranges from 1.14 nm to 173.39 nm, micropores and macropores developed and concentrated, no obvious dominant peak in the mesopores (2-25 nm) with relatively uniform distribution. Fractal dimension values range from 2.42 to 2.81, indicating shale pore structure is complex and heterogeneous. Fractal dimension is positively correlated with specific surface area and total pore volume, and highly negatively correlated with the average pore diameter. Fractal dimension is also a characterization of buried depth, and there is a weak positive correlation between them. With the increase of buried depth, fractal dimension has an increasing trend. The study provides a new method to further understand the shale nanometer pore structural heterogeneity.
机译：过渡相的页岩气资源是重要的非常规能源。为了了解页岩储层的渗流特征，采用低压氮吸附实验研究了山西组页岩的纳米级孔隙结构和吸附分形特征。采用FHH分形模型计算吸收孔分形维数D，定量确定分形维数与孔隙参数之间的关系。结果表明，由解吸支链得到的分布曲线的孔径分布范围为1.14 nm至173.39 nm，微孔和大孔发达并富集，在中孔（2-25 nm）中没有明显的主峰，分布相对均匀。分形维数范围为2.42至2.81，表明页岩孔隙结构复杂且异质。分形维数与比表面积和总孔体积呈正相关，与平均孔径高度呈负相关。分形维数也是埋藏深度的特征，它们之间存在弱的正相关。随着埋深的增加，分形维数有增加的趋势。该研究为进一步了解页岩纳米孔结构异质性提供了一种新方法。

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