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Angry farmers are refusing surveyors access to their properties as they try to block moves to store carbon dioxide in an aquifer which sits under prime agricultural land.

The seismic survey is part of a feasibility study by the South West Hub project, a partnership between the State Government and a host of Australia's biggest companies.

The study is assessing the potential to store more than three million tonnes of CO{-2} a year in the Lesueur aquifer in the Shire of Harvey. A network of pipelines from Kwinana, Alcoa's Pinjarra and Wagerup refineries, and Collie would transfer CO{-2} to the aquifer.

Wagerup dairy farmer Tony Ferraro said more than 40 farmers were refusing access to their land because of concerns about the project's impact on the environment and their livelihoods.

Mr Ferraro said they were worried about water contamination and the Harvey region's reputation as a source of high-quality milk, beef and fruit.

The Department of Mines and Petroleum hosted a public forum in Harvey last night to discuss the seismic survey, which is estimated to involve about 120 landowners.

DMP carbon strategy co-ordinator Dominique Van Gent said about 70 per cent of landowners had granted preliminary access.

"The department will continue to negotiate with all landholders within the survey's target area in order to reach an agreement," Mr van Gent said.

The DMP is running the SWH project in partnership with Griffin Energy, Verve Energy, BHP Billiton, Worsley Alumina, Wesfarmers, Premier Coal, Perdaman Chemicals and Fertilisers, and Alcoa.

Mr van Gent said the industry partners were contributing to the cost which could reach $1 billion if the project goes ahead.

The Federal Government, which allocated $52 million to the project under the Carbon Capture and Storage National Flagships Program, is paying for the seismic survey.