The decrease of the elastic modulus of oil shale during pyrolysis was mainly caused by pyrolysis of kerogen and the deterioration of the oil shale skeleton at high temperature. Combining the thermal curve of oil shale and the change mechanism of the elastic modulus of oil shale, a quantitative model of the elastic modulus of oil shale during pyrolysis was established. The simulation results were in good agreement with the experimental data and showed that with increasing temperature, the rate and extent of decay of the elastic modulus of oil shale were gradually increased. The attenuation ratios of elastic modulus at 500 °C, 400 °C and 300 °C were approximately 68.04%, 56.42% and 48.66%, respectively.
1. Chong, K. P., Smith, J. W., Chang, B., Roine, S. Oil shale properties by split cylinder method. J. Geotech. Eng. Div., 1979, 105(5), 595–611.
2. Zeuch, D. H. The mechanical behavior of Anvil Points oil shale at elevated temperatures and confining pressures. Can. Geotech. J., 1983, 20(2), 344–352.
3. Eseme, E., Urai, J. L., Krooss, B. M., Littke, R. Review of mechanical properties of oil shales: implications for exploitation and basin modelling. Oil Shale, 2007, 24(2), 159–174.
4. Sun, K., Zhao, Y., Young, D. Thermoelastoplastic damage model of heterogeneous medium and its application to thermal cracking analysis of oil shale in underground mining. Chin. J. Rock Mech. Eng., 2008, 27(1), 42–52 (in Chinese with English abstract).
5. Jiang, X., Chu, T. M., Liang, X. J., Xiao, C. L., Yan, B. Z., Wang, Y. N. Impact of mining oil shale in different methods on the environment. In: Environment, Energy and Sustainable Development (Sung, K. & Chen, eds.). Taylor & Francis Group, London, 2014, 359–363.
6. Zhao, J. Experimental Study on the Microscopic Characteristics and Mechanical Property of Oil Shale under High Temperature & Three-Dimensional Stress. PhD Thesis, Taiyuan University of Technology, 2014 (in Chinese with English abstract).
7. Zhao, G. Study on Thermal Damage Evolution Properties and Damage Model of Oil Shale. PhD Thesis, Jilin University, 2015 (in Chinese with English abstract).
8. Kumar, A., Rao, K. S. Engineering behavior of oil shale at elevated temperature and confining pressure. In: 5th Young Indian Geotechnical Engineers Conference. Vadodara, India, 2015, 102–109.
9. Dong, F. Review of oil shale thermal physical property research. Petrochem. Ind. App., 2016, 35(2), 1–4 (in Chinese with English abstract).
10. Glatz, G., Lapene, A., Castanier, L. M., Kovscek, A. R. An experimental platform for triaxial high-pressure/high-temperature testing of rocks using computed tomography. Rev. Sci. Instrum., 2018, 89(4), 045101, doi: 10.1063/1.5030204.
11. Kang, Z. The Pyrolysis Characteristics and In-situ Hot Drive Simulation Research That Exploit Oil-Gas of Oil Shale. PhD Thesis, Taiyuan University of Technology, 2008 (in Chinese with English abstract).
12. Guo, S., Geng, L. Study on pyrolysis kinetics of oil shales by thermogravimetry. J. Fuel. Chem. & Tech., 1986, 14(3), 21–27 (in Chinese with English abstract).
13. Geng, L., Guo, S. The kinetics of the thermal decomposition of Huadian oil shale by thermogravimetry. J. Dalian Univ. Tech., 1984, 23(4), 39–44 (in Chinese with English abstract).
14. Yang, J. Thermogravimetric investigation of Maoming oil shale pyrolysis kinetics. J. China Univ. Petrol (Edition of Natural Science), 1982, 3, 85–93 (in Chinese with English abstract).
15. Coats, A. W., Redfern, J. P. Kinetic parameters from thermogravimetric data. Nature, 1964, 201, 68–69.
16. Weitkamp, A. W., Gutberlet, L. C. Application of a micro retort to problems in shale pyrolysis. Ind. Eng. Chem. Proc. Des. Dev., 1970, 9(3), 386–395.