LIU Xiao, WANG Fu-gang, YUE Gao-fan, JIN Guang-rong, XIN Xin

Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China

Abstract: The geological storage of CO2 is an effective way to reduce CO2 emissions into the atmosphere. Researches on mineral trapping are crucial for CO2 geological storage since mineral trapping has longer storage time and higher safety than others. This study used TOUGHREACT program to study dissolution and precipitation mechanisms of minerals in the shihezi strata, Ordos Basin, after CO2 injection. The sequestration capacity of CO2 and minerals with CO2 sequestration ability were confirmed. We also studied influences of primary minerals on the sequestration capacity of CO2, and the result shows that feldspar minerals, chlorite and kaolinite are the major of dissolved minerals while ankerite is the major mineral to sequestrate CO2 in the sandstone reservoirs composited mainly by quartz and feldspar. It also shows that contents of chlorite and feldspar group minerals in primary minerals have a great effect on mineral sequestration of CO2, the mineral sequestration of CO2 increases with the increase of the volume fraction of chlorite and feldspar group minerals.

Keywords: carbon dioxide geological storage mineral sequestration ability numerical simulation

*Corresponding Author, E-Mail: 28841891@qq.com

Bulletin of Mineralogy, Petrology and Geochemistry Vol. 34, No.2, 2015, page 395-400