Affiliations:
College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China
Evaluating the porosity of oil shale at high temperatures is essential for resource exploration and development. However, the organic matter in oil shale rock, which is naturally rich in hydrogen, complicates assessments made using nuclear magnetic resonance (NMR) technology. In this paper, the differential T 2 (DT 2) spectrum method is introduced to correct the effects of organic matter on porosity measurements using nuclear magnetic resonance (NMR). Firstly, the T 2 spectrum was obtained for both dry oil shale rock, which contains organic matter, and saturated oil shale rock, which contains both organic matter and pore water. Secondly, the DT 2 spectrum of pore water in oil shale rock was obtained to determine the porosity of the oil shale rock containing organic matter. Finally, the impact of organic matter on the variation in porosity of oil shale rock as temperature increases was discussed. The results indicate that the porosity of oil shale rock increases slightly when the temperature is below 400 °C and rises significantly between 400 °C and 800 °C. The rate of porosity changes in oil shale rock increases gradually between 100 °C and 400 °C. The rate of porosity change in oil shale rock increases significantly and then decreases between 400 °C and 800 °C. There is a specific temperature at which the porosity changes of oil shale transitions from rapid to gradual.
Oil shale, Organic matter, Nuclear magnetic resonance (NMR), High-temperature treatment, Microstructural changes
https://doi.org/10.21833/ijaas.2026.01.013
Ma, C., Qiu, B., & Fan, L. (2026). Effect of organic matter on porosity changes in thermally treated oil shale based on the differential T2 (DT2) spectrum. International Journal of Advanced and Applied Sciences, 13(1), 125–133. https://doi.org/10.21833/ijaas.2026.01.013