Multifractal characteristics of shale and tight sandstone pore structures with nitrogen adsorption and nuclear magnetic resonance

Based on the experiments of nitrogen gas adsorption (N 2 GA) and nuclear magnetic resonance (NMR), the multifractal characteristics of pore structures in shale and tight sandstone from the Chang 7 member of Triassic Yanchang Formation in Ordos Basin, NW China, are investigated. The multifractal spec...

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Bibliographic Details
Published in:Petroleum science 2020-10, Vol.17 (5), p.1209-1220
Main Authors: Wang, Fu-Yong, Yang, Kun, Zai, Yun
Format: Article
Language:English
Subjects:
Adsorption
Cores
Earth and Environmental Science
Earth Sciences
Economics and Management
Energy Policy
Industrial and Production Engineering
Industrial Chemistry/Chemical Engineering
Mineral Resources
Nitrogen
NMR
Nuclear magnetic resonance
Original Paper
Parameters
Pore size
Pore size distribution
Porosity
Sandstone
Sedimentary rocks
Shale
Shales
Size distribution
Specific surface
Spectra
Structures
Surface chemistry
Triassic
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Summary:Based on the experiments of nitrogen gas adsorption (N 2 GA) and nuclear magnetic resonance (NMR), the multifractal characteristics of pore structures in shale and tight sandstone from the Chang 7 member of Triassic Yanchang Formation in Ordos Basin, NW China, are investigated. The multifractal spectra obtained from N 2 GA and NMR are analyzed with pore throat structure parameters. The results show that the pore size distributions obtained from N 2 GA and NMR are different, and the obtained multifractal characteristics vary from each other. The specific surface and total pore volume obtained by N 2 GA experiment have correlations with multifractal characteristics. For the core samples with the similar specific surface, the value of the deviation of multifractal spectra R d increases with the increase in the proportion of large pores. When the proportion of macropores is small, the R d value will increase with the increase in specific surface. The multifractal characteristics of pore structures are influenced by specific surface area, average pore size and adsorption volume measured from N 2 GA experiment. The multifractal characteristic parameters of tight sandstone measured from NMR spectra are larger than those of shale, which may be caused by the differences in pore size distribution and porosity of shale and tight sandstone.
ISSN:1672-5107
1995-8226
DOI:10.1007/s12182-020-00494-2