Injection of acid gas in northeastern British Columbia takes place at six sites into four different stratigraphic intervals. Acid gas mixed with water is injected into the Permo-Carboniferous aquifer at Ring. At Boundary Lake-South and West Stoddart, dry acid gas is injected into aquifers of the Permian Belloy Formation and the Triassic Halfway Formation, respectively. At Caribou, the only injection site within the deformed part of the Rocky Mountain Fold and Thrust Belt, acid gas is injected into the Triassic Halfway aquifer and the Carboniferous Debolt aquifer. Injection into depleted gas reservoirs takes place at Bubbles and Jedney, where the injection horizon is the Triassic Baldonnel Formation. The oldest acid-gas injection sites in the study area are Boundary Lake-South and Jedney, where injection commenced in 1996. By the end of 2004, more than 890 kt of acid gas had been injected into deep geological formations in the northeastern British Columbia region.
Theme Keywords: acid gas; aquifers; basin; carbon dioxide; climatic factors; cretaceous; depositional environment; flow system; fort st. john group; geology; hydraulic gradients; hydrogen sulphide; hydrostratigraphy