• 责任者：Liu Kan (School of Water Resources and Environment ; China University of Geosciences ; Beijing 100083 ; China) ; Sun Ying
• 刊名：Journal of Earth Sciences and Environment
• 出版年：2013
• 卷期：35(3)
• 关键词：二氧化碳 ; carbon dioxide ; 地下储存 ; underground storage ; 塔里木盆地 ; Tarim Basin
• 页码：p.106-112
• 图表：7 illus., 4 tables, 32 refs.
• 分类号：1800
• issnNo：ISSN1672-6561
• isbnNo：CN61-1423/P

     CO2 geological storage is effective to reduce CO2 in atmosphere, but the reef limestone dissolves because of the supercritical CO2 environment, and affects the reserves of CO2. Ordovician reef limestone in Bachu area of Tarim Basin was taken as an example, COs geological storage applied to the reef limestone reservoir was simulated in the condition of temperature with 40 ℃-120 ℃ and partial pressure of CO2 with 8-20 MPa, the macroscopic and microscopic appearance changes of sample before and after the experiment were observed, and the variation trends of solubility and porosity were analyzed. The results show that the solubility of reef limestone decreases with the temperature increasing, and increases with the partial pressure of CO2 increasing, and the temperature is the main factor; the dissolution of supercritical CO2 on reef limestone is strong, and the increment of porosity is large in the condition of the same partialpressure of CO2, lower temperature and larger original porosity, but the change of porosity of reef limestone is negligible in whole because of the double action of temperature and partial pressure of CO2 ; the dissolution of reef limestone reservoir is partially different with the flow of groundwater in the process of supercritical CO2 injection; when supercritical CO2 fluid of unit volume pore water with one thousand times transits at the entrance of unit volume reservoir, the porosity of reef limestone can enlarge twice approximately.