Fracking not viable in UK’S ‘deformed’ rocks

● Expert claims geological buckling and tilt make shale oil and gas unworkable

The UK’S new dash for unconventional oil and gas has come 55 million years too late, according to a leading Scottish academic.

Professor John Underhill, chief scientist at Heriot-watt University, says the country’s complex geology means fracking is not a viable option and is “overhyped” as a solution for keeping the lights on.

He says folds and faults in rock formations deep underground,causedbymovements of the earth’s tectonic plates millions of years ago, mean places identified as harbouring substantial shale oil and gas reserves may be unsuitable for commercial drilling.

“The inherent complexity of the sedimentary basins has not been fully appreciated or articulated and, as a result, the opportunity has been overhyped,” he said.

“For hydraulic fracturing to be successful, a number of geological criteria must be met. The source rock should have a high organic content, a good thickness, be sufficiently porous and have the right mineralogy. The organic matter must have been buried to a sufficient depth and heated to the degree that the source rock producessubstantialamounts of gas or oil.

“However, in locations where fulfilment of some of the criteria have led to large potential deposits, uplift and the faulted structure of the basins are detrimental to its ultimate recovery.”

The UK uses more than 65 billion cubic metres of gas to heat 80 per cent of its 25 million homes and generate around a quarter of its electricity every year. Despite an increasing shift towards renewableenergy,demandfor gas is likely to remain high for the foreseeable future.

Shale gas production has taken off in the US, sparking a rush to replicate the move as North Sea reserves run out.

Three areas of the UK, including Scotland’s Midland Valley, have been earmarked as potential hotspots and exploration licences have already been issued.

Petrochemical giant Ineos holds the majority stake in the only Scottish licence.

A moratorium on fracking, or hydraulic fracturing, has been in place in Scotland since 2015 in response to concerns over the environmental impacts. The Scottish Government is due to decide on a permanent ban soon.

In the meantime, Ineos is shipping US shale gas to its plant in Grangemouth.

But Prof Underhill says firms with plans to frack need to put the unique nature of the UK’S geology at the centre of their considerations, since the places with the biggest resources may actually be unworkable.

“There is a need to factor this considerable and fundamental geological uncertainty into the economic equation,” he said.

“The science shows that our country’s geology is simply unsuitable for shale oil and gas production. The implication that because fracking works in the US it must also work here is wrong.”

He added: “It would be extremely unwise to rely on shale gas to ride to the rescue of the UK’S gas needs only to discover that we’re 55 million years too late.”