A method for determining critical adsorption pore size by combining isothermal adsorption experiment and nuclear magnetic resonance
By combining isothermal adsorption experiments with nuclear magnetic resonance technology, the problem of accurately determining the critical adsorption pore size in existing technologies has been solved, enabling precise pore size determination under real reservoir conditions and improving the efficiency of shale gas reservoir evaluation and development.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SOUTHWEST PETROLEUM UNIV
- Filing Date
- 2026-05-08
- Publication Date
- 2026-07-17
AI Technical Summary
Existing technologies cannot directly capture the critical pore size value of gas transitioning from a free state to an adsorbed state under real reservoir temperature and pressure conditions. Nuclear magnetic resonance technology lacks a clear theoretical basis and cannot accurately define the critical adsorption pore size of adsorbed gas, which affects the evaluation and development of shale gas reservoirs.
By combining isothermal adsorption experiments with nuclear magnetic resonance (NMR) technology, the critical relaxation time and pore throat radius were calculated by measuring the isothermal adsorption data, NMR signal area, and calibration coefficients of shale samples. The relationship between relaxation time and pore size was established, and the critical adsorption pore size was determined.
It enables precise determination of critical adsorption pore size under real reservoir conditions, improving the reliability and development efficiency of shale gas reservoir evaluation, and is applicable to the precise calculation of shale gas and coalbed methane resources.
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Figure CN122409461A_ABST