Researches of CO2 sequestration in case of laboratory experiment and natural analogues

Speaker: Pei-Hua Hsu

 

Abstract

CO2 sequestration by carbonation can be estimated by two ways: laboratory experiments and natural analogues. The first case, it is an example for laboratory experiments of the Ketzin pilot site. Sandstone samples of the Stuttgart Formation have been experimentally treated with CO2 and synthetic reservoir brine in high-quality steel autoclaves at simulated in situ P–T conditions (5.5 MPa, 40 ℃). In order to observe mineralogical changes induced by CO2, untreated samples are compared to CO2-treated ones. During the experiments there are some major alteration in this study can be observed: dissolution of calcium-rich plagioclase, K-feldspar and anhydrite and stabilization or precipitation of albite. The second case, it is an example for natural analogue study of the Miocene basalt in the Kuanhsi-Chutung area, Northwestern Taiwan. This region has great potential in terms of geological and geochemical environments for CO2 sequestration. Outcropping Miocene basalt in the study area shows extensive serpentinization and carbonation. By the result of The carbon and oxygen stable isotopes show that product formation under low temperatures (~ 50–90 ℃). This translates to a depth of 1–2 km, which is a practical depth for a long–term CO2 sequestration reservoir, and CO2 can be trapped into minerals by carbonation.

Reference

Fischer, S., Liebscher A., Wandrey M., the CO2SINK Group (2010). CO2-brine-rock interaction : First results of long-term exposure experiments at in situ P-T conditions of the Ketzin CO2 reservoir. Chemie der Erde 70 S3, 155 – 164.

(Abstract) (Full text)

Lu, H. Y., Lin, C. K., Lin, W., Liou, T. S., Chen, W. F., Chang, P. Y. (2011). A natural analogue for CO2 mineral sequestration in Miocene basalt in the Kuanhsi-Chutung area, Northwestern Taiwan. International Journal of Greenhouse Gas Control 5, 1329 – 1338.

(Abstract) (Full text)