# 초임계 CO2에 의한 셰일 및 사암의 물성변화 및 스웰링에 관한 연구

• Accepted : 2012.08.24
• Published : 2012.08.31
• 81 25

#### Abstract

In this study, a method is devised to implement a supercritical $CO_2$ ($scCO_2$) injection environment on a laboratory scale and to investigate the effects of $scCO_2$ on the properties of rock specimens. Specimens of shale and sandstone normally constituting the cap rock and reservoir rock, respectively, were kept in a laboratory reactor chamber with $scCO_2$ for two weeks. From this stage, a chemical reaction between rock surface and the $scCO_2$ was induced. The effect of saline water was also investigated by comparing three conditions ($scCO_2$-rock, $scCO_2-H_2O$-rock and $scCO_2$-brine(1M)-rock). Finally, we checked the changes in the properties before and after the reaction by destructive and nondestructive testing procedures. The swelling of shale was a main concern in this case. The experimental results suggested that $scCO_2$ has a greater effect on the swelling of the shale than pure water and brine. It was also observed that the largest swelling displacement of shale occurred after a reaction with the $H_2O-scCO_2$ solution. The results of a series of the destructive and nondestructive tests indicate that although each of the property changes of the rock differed depending on the reaction conditions, the $H_2O-scCO_2$ solution had the greatest effect. In this study, shale was highly sensitive to the reaction conditions. These results provide fundamental information pertaining to the stability of $CO_2$ storage sites due to physical and chemical reactions between the rocks in these sites and $scCO_2$.

#### Keywords

CCS(carbon capture & storage);Laboratory experiment;Supercritical $CO_2$;Rock properties;Swelling

#### References

1. Alemu, BinYam, L., Aagaard, P., Munz, I. A., Skurtveit, E., 2011, Caprock interaction with $CO_{2}$: A laboratory study of reactivity of shale with supercritical $CO_{2}$ and brine, Applied Geochemistry, Vol. 26, pp. 1975-1989. https://doi.org/10.1016/j.apgeochem.2011.06.028
2. Chang, S. H., Lee, C. I., 2005, An experimental study on the determination of damage threshold in rock at different stress levels, The journal of korean society of explosives and blasting engineering, Vol. 23, No. 4, pp. 31-44.
3. Guen, Y. L., Hellmann, R., Collombet, M., Gratier, J. P., 2007, Enhanced deformation of limestone and sandstone in the presence of high $PCO_{2}$ fluids, Journal of Geophysical Research B: Solid Earth, Vol. 112, B05421. https://doi.org/10.1029/2006JB004637
4. Hawlader, B.C., Lee, Y.N., Lo, K. Y., 2003, Threedimensional stress effects on time-dependent swelling behaviour of shaly rocks, Canadian Geotechnical Journal, Vol. 40, pp. 501-511. https://doi.org/10.1139/t03-006
5. Izgec, O., Demiral, B., Bertin, H., Akin, S., 2007, $CO_{2}$injection into saline carbonate aquifer formations I: Laboratory investigation, Transport in Porous Media, Vol. 72, No. 1, pp. 1-24.
6. Jang, B. A., Ji, H., Jang, H. S., 2010, The optimal method to determine damage threshold of rock using hwangdeung granite, The journal of engineering geology, Vol. 20, No. 1, pp. 89-100.
7. Kaszuba, J. P., Janecky, D. R., Snow, M. G., 2003, Carbon dioxide reaction processes in a model brine aquifer at 200$^{\circ}C$ and 200bars: implications for geologic sequestration of carbon, Applied Geochemistry, Vol. 18, No. 7, pp. 1065-1080. https://doi.org/10.1016/S0883-2927(02)00239-1
8. Ko, M. J., Kang, H. M., Wang, S. K., Lee, M. H., 2011, The weathering process of olivine and chlorite reacted with the supercritical $CO_{2}$ on the sequestration condition., Journal of the geological society of korea, V. 47, No. 6, pp. 635-645.
9. Okamoto, I., Li, X., Ohsumi, T., 2005, Effect of supercritical $CO_{2}$ as the organic solvent on cap rock sealing performance for underground storage, Energy, Vol. 30, pp. 2344-2351. https://doi.org/10.1016/j.energy.2003.10.025
10. Otheim, T. L., Adam, L., Wijk, K. V., 2011, $CO_{2}$sequestration in basalt: Carbonate mineralization and fluid substitution, The reading edge, Vol. 30, pp. 1354-1400. https://doi.org/10.1190/1.3672479
11. Rimmele, G., Barlet-Gouedard, V., Renard, F., 2009, Evolution of the petrophysical and mineralogical properties of two reservoir rocks under thermodynamic conditions relevant for $CO_{2}$ geological storage at 3 km depth, Oil & Gas Science and Technology, Vol. 65, No. 4, pp. 565-580.
12. Shao, H., Ray, J, R., Jun, Y. S., 2011a, Effects of organic ligands on supercritical $CO_{2}$-induced phlogopite dissolution and secondary mineral formation, Chemical Geology, Vol. 290, pp. 121-132. https://doi.org/10.1016/j.chemgeo.2011.09.006
13. Shao, H., Ray, J, R., Jun, Y. S., 2011b, Effects of salinity and the extent of water on supercritical $CO_{2}$-induced phologopite dissolution and secondary mineral formation, Environmental Science and Technology, Vol. 45, pp. 1737-1743. https://doi.org/10.1021/es1034975
14. Suto, Y., Liu, L., Yamasaki, N., Hashida, T., 2007, Initial behavior of granite in response to injection of $CO_{2}$- saturated fluid, Applied Geochemistry, Vol. 22, Issue 1, pp. 202-218. https://doi.org/10.1016/j.apgeochem.2006.09.005
15. Wong, R. C. K., 1998, Swelling and softening behavior of La Biche shale, Canadian Geotechnical Journal, Vol. 35, pp. 206-221. https://doi.org/10.1139/t97-087

#### Cited by

1. Reaction in High Pressure Condition vol.26, pp.4, 2016, https://doi.org/10.7474/TUS.2016.26.4.293

#### Acknowledgement

Grant : CO2 해양지중저장 기술개발

Supported by : 한국해양과학기술진흥원