Determination of pores properties in rocks by means of helium-3 NMR: A case study of oil-bearing arkosic conglomerate from North belt of crude oil, Republic of Cuba

The developments of helium-3 nuclear magnetic resonance (NMR) technique to assess porous media properties such as porosity and pore size distribution (PSD) are reported. The method is suitable for use to characterize unconventional extra-heavy oil reservoirs, has a potential in application to tight...

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Bibliographic Details
Published in:Journal of petroleum science & engineering 2022-03, Vol.210, p.110010, Article 110010
Main Authors: Safiullin, Kajum, Kuzmin, Vyacheslav, Bogaychuk, Alexander, Alakshin, Egor, González, Lisset Miquel, Kondratyeva, Ekaterina, Dolgorukov, Gleb, Gafurov, Marat, Klochkov, Alexander, Tagirov, Murat
Format: Article
Language:English
Subjects:
Carbonizate
Helium-3
Nuclear magnetic resonance
Pore size distribution
Porosimetry
Sandstone
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Summary:The developments of helium-3 nuclear magnetic resonance (NMR) technique to assess porous media properties such as porosity and pore size distribution (PSD) are reported. The method is suitable for use to characterize unconventional extra-heavy oil reservoirs, has a potential in application to tight shales and other unconventional formations, and has several advantages over conventional water NMR. It is based on 3He nuclear magnetic relaxation measurements for different pore loadings and inverse Laplace transform of the data. The relation between different pore types as well as their mean radii are found within the models of spherical, cylindrical and planar pores. The method was applied to study porosity and PSD of rock samples acquired at the North belt of crude oil, Republic of Cuba, the unconventional formation known for its complexity. The obtained pore sizes and porosities are in a good agreement with conventional methods which validates the proposed 3He NMR approach for porous media studies. Advantages of the 3He liquid and gas as probes are discussed. •Characterization of pore structure with the smallest probing atoms — helium-3.•Advantages over conventional water nuclear magnetic resonance technique.•No need to separate the signal from sample and probe molecules.•Access to hidden pores and pores with weak connectivity.•Porosity and pore size distributions of unconventional and clay-rich oil formations.
ISSN:0920-4105
1873-4715
DOI:10.1016/j.petrol.2021.110010