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Wednesday 25 April 2012

Controversial “fracking” for shale gas should only take place at least 600 metres down from aquifers used for water supplies, scientists said on Wednesday.

A new study revealed the process, which uses high-pressure liquid pumped deep underground to split shale rock and release gas, caused fractures running upwards and downwards through the ground of up to 588 metres from their source.

The research, published in the journal Marine and Petroleum Geology, found the chance of a fracture extending more than 600 metres upwards was exceptionally low, and the probability of fractures of more than 350 metres was 1%.

Researchers said the study showed it was “incredibly unlikely” that fracking at depths of 2km to 3km below the surface would lead to the contamination of shallow aquifers which lie above the gas resources.

Shale gas extraction has been controversial in the US because of claims that cancer-causing compounds used in the process have polluted water supplies, and that the flammable methane gas itself can pollute drinking water.

 

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Restrict shale gas fracking to 600m from water supplies, says study – The Guardian

 

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