UK Shale Resources Much Bigger Than Previously Thought
Estimates of Cuadrilla’s shale gas resource in the North West of England may have to be increased significantly upwards. A geologist with the company said there is 330 trillion cubic feet (tcf) of gas in place in its licence area, 50% more than previous estimates.
Cuadrilla is the only company in the UK to have used hydraulic fracturing (fracking) in its test wells.
But it could take two years to see if the gas is commercially viable.
Last summer the British Geological Survey (BGS) reported that there could be around 1,300 tcf of gas in the Bowland basin in North West England.
Based on data from two wells that it had fracked in 2011, Cuadrilla estimated that there was around 200 tcf in its licence areas.
“In terms of the resource in place, we originally came out with 200 tcf,” said Huw Clarke, a geologist with the company, told a conference in London.
“That was just off one well, that was ratified by the BGS, and we were very happy about that. Since then we’ve drilled two extra wells and we’ve shot 100sq km of 3D seismic information and I believe there’s closer to 330 tcf in place just within Cuadrilla’s licence area alone.”
Cuadrilla’s fracking at one of the locations, Preese Hall, was controversial as it was believed to have set off two small earthquakes in the area. This led to a temporary ban and new guidelines on safety and best practice.
The company has become a target for environmental protestors who believe that fracking poses a threat to groundwater supplies.
However, the potential impact of shale gas on UK energy supplies and the economy has won the support of government and investors.
Last year, Cuadrilla sold a 25% stake in its Bowland exploration licence to Centrica, the company that owns British Gas.
Cuadrilla is now in the process of expanding its operation in Lancashire, announcing recently that it was seeking planning permission for two new sites at Roseacre Wood and Preston New Road.
It plans to drill and hydraulically fracture four exploration wells at each site.
“If you can get one of those eight wells to show that it is commercially viable, I think that would be a strong push to take it to the next stage which would be a field development plan,” said Huw Clarke.
“But we’re a couple of years off that.”
Other speakers at the Shale UK conference were cautious about the potential boom in exploration, believing that recovering the gas would require extensive drilling.