Acid-gas injection at West Stoddart, British Columbia: An analogue for the detailed hydrogeological characterization of a CO2 sequestration site |
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| Authors: | Karsten Michael BE Buschkuehle |
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| Institution: | Alberta Energy and Utilities Board, Alberta Geological Survey, Edmonton, AB, Canada |
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| Abstract: | Geological sequestration of CO2 is an option for significantly reducing emissions into the atmosphere. Various hydrocarbon companies in western Canada are currently injecting acid-gas (CO2 and H2S) into deep subsurface formations. At West Stoddart, in northeast British Columbia, acid-gas has been injected since 1998 at 1600 m depth into sandstones of the Triassic Halfway Formation, which forms a regional aquifer. A comprehensive subsurface characterization was conducted of the regional and local-scale geology, reservoir characteristics, mineralogy, in situ fluid properties, and hydrogeology. Preliminary results from geochemical and numerical multi-phase flow modelling suggest that the majority of the injected acid-gas will dissolve in the formation water and remain within a radius of a few kilometres of the injection well. The experience with the acid-gas injection at West Stoddart and other operations in the Alberta Basin has shown that the process of large-scale CO2-injection into deep aquifers is technically feasible. |
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| Keywords: | Alberta Basin CO2 sequestration Acid-gas injection Multi-phase flow |
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