Effects of rate law formulation on predicting CO2 sequestration in sandstone formations

摘要: Summary Injection of CO2 into confined geological formations, given their massive carbon storage capacity and widespread geographic distribution, represents one the most promising options for sequestration. Reactive transport models have been constructed to understand process predict fate injected CO2. Model results, however, differ dramatically because large uncertainties attributed reaction kinetics. The root this problem is partly related biggest challenges in modern geochemistry: persistent two five orders magnitude discrepancy between laboratory-measured field-derived feldspar dissolution rates. Recently, advances kinetics research suggest that slow precipitation secondary minerals produces negative feedback dissolution–precipitation loop, which reduces overall rates by magnitude. In study, we focused on how coupling mineral precipitation, as well carbonation, affected rate law uncertainties. with four different scenarios were used sequestration a sandstone formation resembling Mt. Simon saline reservoir Midwest, USA. results indicate (1) long-term trapping more sensitive laws than carbonate (2) negligence sigmoidal shape – ∆Gr relationships mitigating effects can overestimate both extent during injection turn trapping. Copyright © 2015 John Wiley & Sons, Ltd.