Offshore storage of CO 2 in the UK North Sea may lead to the production of reservoir fluids which have the potential to contain significant concentrations of contaminant metals, which could be of harm to the environment. Laboratory batch leaching experiments with CO 2 at elevated temperatures, and sequential extraction analysis of reservoir materials have determined that metal concentrations in a selection of North Sea reservoir sandstones are low (parts per billion -parts per million), and

more »

... their mobility under weak acid leaching is also low. For the metals investigated, concentrations in waters produced as a consequence of CO 2 storage are unlikely to exceed concentrations from current UK offshore oil and gas activities.