Fort Nelson Test Site - Preliminary Geochemical Observations
The Energy & Environmental Research Center conducted a screening-level geochemical laboratory test program (2009 through 2011) to investigate the potential effects of the injection of CO2 and sour CO2 (i.e., a mixture of CO2 and H2S ranging from 86.5% CO2 and 13.5% H2S to 95% CO2 and 5% H2S) on the cap rock, transition-zone rock, and reservoir rock from Spectra Energy Transmissions Fort Nelson Carbon Capture and Storage (CCS) Feasibility Project in northeastern British Columbia, Canada. Drill cutting samples from six different formations representing potential cap rock and storage reservoir rocks were used for characterization and laboratory testing. The primary goals of this program were as follows: 1) identify the predominant mineral phases of the potential sink and seal formations; 2) determine possible interactions and mineralogical changes within the cap rock, transition-zone rock, and reservoir rock when exposed to CO2 and sour CO2 at near- and far-from-wellbore reservoir conditions; 3) determine the mineral dissolution and precipitation potential resulting from the exposure of the cap rock, transition-zone rock, and reservoir rock to CO2 and sour CO2; and 4) determine potential changes in reservoir fluid properties as a result of CO2 and sour CO2 injection into the geologic storage reservoir(s).View/Download Document