Impact potential of hypersaline brines released into the marine environment for CCS reservoir pressure management

Dewar, M; Blackford, JC; Espie, T; Wilford, S; Bouffin, N. 2022 Impact potential of hypersaline brines released into the marine environment for CCS reservoir pressure management. International Journal of Greenhouse Gas Control, 114. 103559. https://doi.org/10.1016/j.ijggc.2021.103559

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Official URL: http://dx.doi.org/10.1016/j.ijggc.2021.103559

Abstract/Summary

The environmental impact potential arising from the possible disposal of hypersaline brines into the ocean as part of reservoir pressure management for Carbon Capture and Storage is assessed using sophisticated high-resolution hydrodynamic models for the first time, investigating several industry guided scenarios. Although the characteristics of some brines in their undiluted form would have a high environmental impact potential, we find that dispersion in a hydrodynamically active region like the North Sea acts to dilute disposed brine rapidly, even in a worst case approach, such that the potential impact footprint (area exposed to environmentally damaging salinity or temperature) is small, measured in 10’s of meters depending on the release scenario and site specific data such as the hypersaline water contaminants along with in-situ conditions such as currents and mixing. The method of brine disposal has a significant influence on dispersal, such that brines released nearer the sea surface disperse more rapidly, compared with release at the seabed. Hence consideration of brine release height is recommended to further limit impact potential

Item Type: Publication - Article
Additional Keywords: Storage Saline aquifers Pressure management Environmental Impact
Divisions: Plymouth Marine Laboratory > National Capability categories > Modelling
Plymouth Marine Laboratory > Science Areas > Marine Ecosystem Models and Predictions
Depositing User: S Hawkins
Date made live: 04 Jan 2022 15:01
Last Modified: 04 Jan 2022 15:01
URI: http://plymsea.ac.uk/id/eprint/9509

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