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Evaluation of experimentally observed CO2-water-rock interactions by comparison to those in natural CO2-analogues.

Laboratory scale experiments in which rock samples are exposed to CO2-charged fluids at high pressure/temperature conditions are considered a viable tool for assessing the impact of CO2-water-rock interactions. Because most CO2-water-rock interactions are kinetically slow processes, such experiments are generally performed at temperature and flow conditions that favour faster reaction kinetics, to form detectable reaction products within the duration of the experiments (weeks to months).
The recently obtained sample material from the Green River natural CO2 accumulation offers a unique opportunity to evaluate the represantiveness of above mentioned laboratory experiments. A high-pressure/temperature experiment will be set up in a flow reactor specially designed for studying CO2-water-rock interactions. Experimentally induced water-rock interactions will be inferred from the evolution of the fluid chemistry during the experiment and a detailed characterisation of the selected rocks sample before and after the experiment. The obtained results will be compared to the alterations observed in the natural CO2 field. Geochemical modelling will be used as a tool to extrapolate the observed mineral alterations between experimental and natural p/T conditions.

Start of work: summer 2013
Supervision: Pieter Bertier, Helge Stanjek
Project partners: Bonn University, Cambridge University, Shell
Level: MSc