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Chapter 4 Review of EGS and Related Technology – Status and Achievements 4.4 Rosemanowes 4.4.1 Project history 414 Figure 4.5 European EGS site locations (Google Earth). The Carnmenellis granite is roughly ellipsoidal in outline, and it forms part of a continuous granite batholith of early Permian age of more than 200 km in length. The base of the granite extends well below a depth of 9 km. At the Rosemanowes site, the granite is porphyritic near the surface, tending to become equigranular at about 2 km. Phase 1 of the project started in 1977, with the drilling of a number of 300 m test wells. The purpose of these wells was to test some possible fractureinitiation techniques. It was found, however, that the stress field at this depth was unrepresentative of that to be encountered at depths of real interest. As a result of experience during Phase I at Fenton Hill, in 1977, the Camborne School of Mines undertook an experimental hot dry rock (HDR) project at Rosemanowes Quarry (near Penryn in Cornwall, U.K.) in the Carnmenellis granite (see Figure 4.5). The project was funded by the U.K. Department of Energy and by the Commission of the European Communities, and was intended as a largescale rock mechanics experiment addressing some of the issues surrounding the stimulation of adequate fracture networks (Batchelor, 1982). Because the temperature was restricted deliberately to below 100°C, to minimize instrumentation problems, this project was never intended as an energy producer. The site was chosen because mine works in the area allowed rock characterization to a depth of more than 1,000 m, due to the clearly defined vertical jointing evident in the exposed granite – and because of the area’s heat flow and hightemperature gradients between 30 and 40°C per kilometer. The main tectonic regime of the area is strikeslip.PDF Image | Review of EGS and Related Technology
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