摘要：Laboratory experiments evaluated two shale caprock formations, the Gothic Shale and Marine Tuscaloosa Formation, at conditions relevant to carbon dioxide (CO2) sequestration. Both rocks were exposed to CO2-saturated brines at 160 degrees C and 15MPa for approximate to 45 days. Baseline experiments for both rocks were pressurized with argon to 15MPa for approximate to 35 days. Varying concentrations of iron, aqueous silica, sulfate, and initial pH decreases coincide with enhanced carbonate and silicate dissolution due to reaction between CO2-saturated brine and shale. Saturation indices were calculated and activity diagrams were constructed to gain insights into sulfate, silicate, and carbonate mineral stabilities. Upon exposure to CO2-saturated brines, the Marine Tuscaloosa Formation appeared to be more reactive than the Gothic Shale. Evolution of aqueous geochemistry in the experiments is consistent with mineral precipitation and dissolution reactions that affect porosity. This study highlights the importance of tracking fluid chemistry to clarify downhole physicochemical responses to CO2 injection and subsequent changes in sealing capacity in CO2 storage and utilization projects.

关键字：CO2 capture and storage geochemical reactions global-scale and regional-scale environmental impacts inorganic geochemistry thermodynamics and equilibrium

ISSN号：1092-8758

卷、期、页：卷: 33 期: 10 页: 736-744 特刊: SI

发表日期：2016-10-01

期刊分区（SCI为中科院分区）：四区

收录情况：SCI（科学引文索引印刷版）,ESI（基本科学指标数据库）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：ENVIRONMENTAL ENGINEERING SCIENCE

参与作者：Miller, Quin R. S.,Kaszuba, John P.,Mouzakis, Katherine M.,Navarre-Sitchler, Alexis K.,Alvarado, Vladimir,McCray, John E.,Rother, Gernot,Banuelos, Jose Leobardo,Heath, Jason E.

第一作者：王秀宇

论文类型：期刊论文

论文概要：Miller, Quin R. S.,王秀宇,Kaszuba, John P.,Mouzakis, Katherine M.,Navarre-Sitchler, Alexis K.,Alvarado, Vladimir,McCray, John E.,Rother, Gernot,Banuelos, Jose Leobardo,Heath, Jason E.，Experimental Study of Porosity Changes in Shale Caprocks Exposed to Carbon Dioxide-Saturated Brine II: Insights from Aqueous Geochemistry，ENVIRONMENTAL ENGINEERING SCIENCE，2016，卷: 33 期: 10 页: 736-744 特刊: SI

论文题目：Experimental Study of Porosity Changes in Shale Caprocks Exposed to Carbon Dioxide-Saturated Brine II: Insights from Aqueous Geochemistry