Application of Low Pressure N2 Adsorption on Shale Nanoscale Pore Structure: Examples from the Permian Shanxi Formation of Transitional Facies Shale
International Journal of Oil, Gas and Coal Engineering
Volume 6, Issue 6, November 2018, Pages: 134-141
Received: Aug. 15, 2018; Accepted: Aug. 29, 2018; Published: Oct. 12, 2018
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Delu Xie, School of Earth Sciences and Engineering, Nanjing University, Nanjing, China; National Engineering Research Center of Coal Mine Water Hazard Controlling, Suzhou, China
Suping Yao, School of Earth Sciences and Engineering, Nanjing University, Nanjing, China
Rongjie Hu, National Engineering Research Center of Coal Mine Water Hazard Controlling, Suzhou, China
Biao Liu, School of Earth Sciences and Engineering, Nanjing University, Nanjing, China
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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.
Low Pressure N2 Adsorption Isotherms, Nanoscale Pore, Adsorption Characteristics, FHH Fractal Model, Shanxi Formation Shale
To cite this article
Delu Xie, Suping Yao, Rongjie Hu, Biao Liu, Application of Low Pressure N2 Adsorption on Shale Nanoscale Pore Structure: Examples from the Permian Shanxi Formation of Transitional Facies Shale, International Journal of Oil, Gas and Coal Engineering. Vol. 6, No. 6, 2018, pp. 134-141. doi: 10.11648/j.ogce.20180606.12
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