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Impact of salinity on CO 2 containment security in highly heterogeneous reservoirs
Author(s) -
AlKhdheeawi Emad A.,
Vialle Stephanie,
Barifcani Ahmed,
Sarmadivaleh Mohammad,
Zhang Yihuai,
Iglauer Stefan
Publication year - 2018
Publication title -
greenhouse gases: science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.45
H-Index - 32
ISSN - 2152-3878
DOI - 10.1002/ghg.1723
Subject(s) - salinity , brine , environmental science , plume , context (archaeology) , containment (computer programming) , fluvial , hydrology (agriculture) , geology , chemistry , geotechnical engineering , oceanography , geography , geomorphology , meteorology , computer science , programming language , paleontology , organic chemistry , structural basin
It is well established that brine salinity can vary substantially in prospective CO 2 geo‐storage reservoirs. However, the impact of salinity on containment security has received only little attention. We thus used a compositional reservoir simulation to evaluate the effect of salinity on CO 2 plume migration and CO 2 trapping capacities in a 3D heterogeneous reservoir. The used heterogeneous reservoir consists of two formations: the bottom part of the reservoir is a fluvial reservoir, and the top part represents a near‐shore environment. Our results clearly indicate that salinity has a significant influence on CO 2 migration and the relative amount of mobile, residual, and dissolved CO 2 . Lower salinity decreases CO 2 mobility and migration distance, and enhances residual and solubility trapping significantly. We thus conclude that brine salinity is an important impact factor in the context of CO 2 geo‐storage, and that less saline reservoirs are preferable CO 2 sinks due to increased storage capacity and containment security. © 2017 Society of Chemical Industry and John Wiley & Sons, Ltd.