<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Reservoir-geological characterization of a Fractured Limestone: Results obtained from the\r\nGeothermal Well St. Gallen GT-1 (Switzerland)"^^ . "St.Gallen is situated in the western Molasse Basin (MB), an orogenic foreland basin of the Alps. The aquifer is formed by Upper\r\nJurassic carbonates. In the eastern Molasse Basin (Germany), these carbonates are often dolomitized showing high hydraulic\r\nconductivities. For several years, geothermal plants such as Unterhaching have been producing electricity and heat.\r\nIn 2009, the St.Gallen geothermal project started with a feasibility study based on a small quantity of data. Accordingly, production\r\nflow rates of 50 l/s should be possible at temperatures from 145 to 150°C. 3D seismic investigations concretizing the well design in\r\npreparation of the geothermal well were carried out. From March to July 2013, the St.Gallen GT-1 well was drilled into the Middle\r\nJurassic down to a depth of 4450 mMD (4255 mTVD). According to plan, the NNE-SSW striking St. Gallen fault-zone could be\r\ndrilled through in the Upper Jurassic section.\r\nThe potential Upper Jurassic aquifer was developed from 3992 – 4404 mMD. Yellowish-brown micritic limestones containing\r\nresidues of siliceous sponges were developed here from 3992 – 4280 mMD, a dark-grey micrite with sponge needles (basinal\r\nlimestones) from 4280 - 4375 mMD, sandy calcisiltites down to 4404 mMD, and Dogger rocks down to 4450 mMD. In place of the\r\nexpected Quinter limestones (Helvetian facies), Swabian sponge mass facies were found. Dolomites causing the good\r\npermeabilities in the eastern Molasse Basin could be observed very subordinately. Indications of karstification, open porosities and\r\nfractures were only scarce. Increased quantities of transparent calcites could be observed only at 4070 mMD and from 4150 –\r\n4210 mMD; white calcites observed from 4315 – 4335 mMD indicate a fault zone with closed fractures. Temperature logs and\r\nother parameters show anomalies in three sections indicating inflow zones.\r\nThe well St.Gallen Gt-1 was acidized several times in July and October 2013 and investigated hydraulically by means of injection\r\nand production tests. The produced deep water contains dissolved salts (TDS approx. 25 g/l) and gas. The hydraulic parameters and\r\nthe structure of the reservoir could be determined by means of the tests. The pressure behavior curves indicated two closed\r\nboundaries correlating with faults in the St. Gallen fault zone. The hydraulic conductivity between the two peaks is increased here,\r\nbut with a limited reach. The inflows are tied strictly to the faults."^^ . "2015-04" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . "Marcus"^^ . "Wolfgramm"^^ . "Marcus Wolfgramm"^^ . . "Peter"^^ . "Kuhn"^^ . "Peter Kuhn"^^ . . "Michael"^^ . "Sonderegger"^^ . "Michael Sonderegger"^^ . . "Hans-Dieter"^^ . "Voigt"^^ . "Hans-Dieter Voigt"^^ . . "Henry"^^ . "Naef"^^ . "Henry Naef"^^ . . "Thomas"^^ . "Bloch"^^ . "Thomas Bloch"^^ . . "Jörn"^^ . "Bartels"^^ . "Jörn Bartels"^^ . . "Stephan"^^ . "Uhlig"^^ . "Stephan Uhlig"^^ . . "Torsten"^^ . "Steiger"^^ . "Torsten Steiger"^^ . . "Stefan"^^ . "Heuberger"^^ . "Stefan Heuberger"^^ . . "Peter"^^ . "Seibt"^^ . "Peter Seibt"^^ . . "Geothermie Neubrandenburg GmbH, Germany"^^ . . . "Sankt Galler Stadtwerke, Switzerland"^^ . . . "Geothermie Neubrandenburg GmbH, Germany"^^ . . . "Proseis AG, Switzerland,"^^ . . . "Proseis AG, Switzerland,"^^ . . . "Geosfer ag, Switzerland"^^ . . . "Geothermie Neubrandenburg GmbH, Germany"^^ . . . "Geothermie Neubrandenburg GmbH, Germany"^^ . . . "Sankt Galler Stadtwerke, Switzerland"^^ . . . "Geotec Consult, Germany"^^ . . . "Geotec Consult, Germany"^^ . . . . . "Proceedings World Geothermal Congress 2015"^^ . . . . . "Melbourne, Australia"^^ . . . . . "HTML Summary of #2267 \n\nReservoir-geological characterization of a Fractured Limestone: Results obtained from the \nGeothermal Well St. Gallen GT-1 (Switzerland)\n\n" . "text/html" . . . "Other-additional study" . . . "St. Gallen" . . . "Geothermal energy production" . .