Offshore Gippsland is widely recognised as one of the most promising CCS sites in Australia, with its proximity to large point sources and promising storage offshore.
Storage offshore at Sleipner and SnØvit has been successful, but the monitoring techniques there focused on marine seismic, and did not fully investigate effects at the seabed or in the water column.
The project provides an assessment of some proposed techniques for this type of “shallow focused” monitoring that may be used in offshore Gippsland. The methods considered may be useful for defining baselines and checking for some aspects of possible environmental impact. The study will inform the first phase of purchasing of marine monitoring assets, funded under the Commonwealth educational infrastructure funds (EIF), leading to more detailed investigation of their capabilities.
Existing expertise and databases in CSIRO Oceans and Atmosphere Flagship (O&A) have been used to assess the ability to measure the ingress of stored CO2 into the water column, and to quantify the size and type of loss of containment at the seabed that could be detected. O&A has baseline data and experience, relevant to the likely storage areas, covering tide and current patterns, seasonal and spatial variations in seawater composition, instrumentation, and modelling. This report investigates some elements of a model monitoring programme, namely measurement of water chemistry, and acoustic mapping.