What is CCUS

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Carbon dioxide is produced when fossil fuels including coal, oil and natural gas are burnt in power plants or factories. It is also released in the production process of oil and gas, ending up in the atmosphere. The purpose of CCUS is to “capture” the CO2 before it’s released to the atmosphere and permanently store it deep underground. Capture rates of around 90 percent of total CO2 emissions produced by power plants, heavy industries and refineries are technically achievable. Further research is underway to improve capture rates above 90%.



CO2CRC injected approximately 65,000 tonnes of CO2 -rich gas (Buttress gas) into the 25m thick Waarre Unit C sandstone within the depleted Naylor natural gas field at a depth of 2,000m in the Otway Basin, Victoria Australia.

Buttress gas, containing tracers to track dispersion and diffusion, was injected through injection well CRC-1 located at the flank of the reservoir at a rate of approximately 120 tonnes per day for 18 months. As modelled, the injected gas migrated up-dip to accumulate at the crest of the reservoir below the Flaxman formation (regional top seal). The Naylor-1 well, a legacy well on the structure (suspended gas producer) and located at the crest of the reservoir was used as the monitoring well. U-tubes were used to obtain downhole fluid samples during and after the injection and provided a direct measurement of storage efficiency.

Assurance monitoring included surveillance of the atmosphere, soil gas and shallow groundwater. To date, no tracer compounds have been detected above background levels in samples taken as part of the assurance monitoring program.