IN response to the claims by Professor Roy Thompson of Edinburgh University that onshore oil and gas exploitation is “barely economically feasible” in the UK (“Study warns North Sea oil and gas will end in 2027”, The Herald, September 20), I should like to make the following rejoinder.

An analysis of 25 shale gas systems in the United States isn’t a good basis for sweeping assertions about Scotland. Mr Thompson has suggested the total organic carbon (TOC), one of the determining factors in hydrocarbon viability, for Scottish shale is two per cent. If he had referred to the British Geological Survey 2014 report on Scottish shale gas he would have seen that Scottish deposits in the West Lothian Oil-Shale area have a significant number of deposits between seven and 30 per cent and that there are a significant net thicknesses of shale with TOC contents of more than two per cent TOC.

Where we as an industry and Mr Thompson agree is that the UK faces a future of growing gas imports. At present, 50 per cent of our gas comes from outside the UK – a significant turnaround from 17 years ago when we were a gas exporter. This is set to rise to 80 per cent in the next 17 years and has massive implications, both economically and environmentally.

Oil and gas history is littered with stories of “it’s not going to happen because … “ and we have often been surprised. The imperative to find out what is below our feet is what drives our industry.

Ken Cronin,

Chief Executive,

UK Onshore Oil and Gas,

40 Dukes Place, London.