San Leon Energy has started drilling the Siciny-2 well, which is located in the south-west Carboniferous Basin, Poland.
The well will be drilled to a total depth of 3,500m, and includes 400m of core and an advanced geological and geophysical evaluation programme.
San Leon will test the unconventional gas potential of the Carboniferous sediment, which is expected to be the source rock for the gas production in the overlying Permian Rotligendes and Zechstein formations.
The firm will plan further evaluation and drilling in the region in 2012, based on the results of the Siciny-2 well.
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