Results from the First Monitor VSP Survey at the Quest CCS Operation

The Quest Carbon Capture and Storage (CCS) Operation is a fully integrated CCS project, designed to safely capture, transport and store more than a million tonnes of CO2 annually. Time-lapse seismic is a key technology deployed by the Quest MMV Plan to ensure both the current and long term security of CO2 storage in the injection zone, the BCS saline aquifer. In the first few years of operation, VSPs are a practical and economical alternative to 3D surface seismic, and as of 2016 a baseline and one monitor 2D DAS VSP survey have been acquired. A summary of the first monitor VSP is presented in this paper, along with a discussion of the acquisition geometry, processing and imaging results. The first monitor VSP was able to conclusively demonstrate the presence of CO2 in the injection zone. An interpretation of the time-lapse results is compared to the dynamic reservoir modelling prediction for the extent of CO2 in the injection zone.