A method for characterizing multi-scale pore throat of tight sandstone reservoir

By combining nuclear magnetic resonance and high-pressure mercury injection techniques, the problem of overlapping pore and throat size distribution in tight sandstone reservoirs was solved, enabling accurate characterization of the pore-throat system and providing a reliable method for revealing pore-throat structure.

CN118794852BActive Publication Date: 2026-03-24PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-04-12
Publication Date
2026-03-24

AI Technical Summary

Technical Problem

Existing technologies are unable to accurately distinguish and characterize small pores and throats in tight sandstone reservoirs, resulting in overlapping pore and throat size distributions and making it impossible to accurately characterize the size distribution of pores and throats.

Method used

Nuclear magnetic resonance (NMR) technology was used to obtain the pore throat radius and its distribution ratio, and high-pressure mercury intrusion porosimetry was used to obtain the throat distribution ratio. The size distribution of pores and throats was separated by linear fitting, and the synergistic characterization method of NMR and high-pressure mercury intrusion porosimetry was used.

Benefits of technology

It enables accurate separation of pore and throat size distribution in the pore-throat system of tight sandstone reservoirs, providing a reliable means to reveal the pore-throat structure of tight oil reservoirs.

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Abstract

The application discloses a method for characterizing multi-scale pore-throat of a tight sandstone reservoir, and the size and distribution proportion of pore-throat radius are obtained by processing a rock sample through nuclear magnetic resonance, and the size and distribution proportion of throat radius are obtained through high-pressure mercury injection, so that the distribution of pure pores of the rock sample is obtained. The size distribution of pores and throats in the multi-scale pore-throat system is separated, the size distribution of pores and the size distribution of throats are obtained, and the problem that small pores and throats are difficult to effectively distinguish and the distribution of small pores and throats is not accurately described due to the close radius size is solved.
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Citation Information

Patent Citations

  • Sandstone pore size distribution determination method and application thereof

    CN112284999A

  • Compact sandstone micro-pore structure characterization method

    CN112362553A