FRANKFURT, May 8 (Reuters) - Germany's state of Lower Saxony plans to launch a legal move in parliament next month that will seek to end a ban on new exploration for deep-lying gas using the "fracking" technology deployed in the country for over 30 years.
The state, which holds 95 percent of German gas reserves, has lost mining royalties from a two-year long suspension of new permits for hydraulic fracking, which it had quietly been using for decades to get at "tight" gas situated deep underground.
Tight sandstone reservoirs in Germany are typically 3,000 to 5,000 metres deep, while shale formations are between 1,000 and 2,500 metres deep. Opponents say the shallower shale gas deposits open up the potential for contamination of drinking water, which goes down to 1,000 metres.
German shale fracking was initially rejected in an emotional debate, which in the process blocked new tight gas projects because the authorities did not want to be associated with the unpopular process.
Fracking involves the pumping of water and chemicals at high pressure through drill holes to prop open rocks.
Lower Saxony's economics minister, Olaf Lies, said in a statement on Thursday he will present a draft law to the Bundesrat, made up of the governments of the 16 states, in mid-June, that will make environmental audits mandatory in order to free up the process.
"I am confident that we can create a new legal framework by the autumn," Lies said, making clear his initiative was not an attempt to open the way to fracking for shale gas.
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