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Advances in European Geothermal Research: Proceedings of the by A. Strub (auth.), A. S. Strub, P. Ungemach (eds.)

By A. Strub (auth.), A. S. Strub, P. Ungemach (eds.)

The first main issue in strength costs used to be unquestionably a powerful stimulus for the involvement of the fee of the eu groups in learn and improvement on replacement strength assets. certainly, the necessity to conquer problems confronted via the neighborhood as a complete, relatively these as a result of its critically unbalanced strength provide, made a standard group process appear in particular apt. This reasoning additionally applies to strength R&D, considering that responses to the quandary might be not just political or fiscal, but in addition medical. 4 years have handed because the selection of the Council of Ministers to release the 1st neighborhood strength learn and improvement Programme, facing geothermal power, solar power, hydrogen construction and utili­ sation, power conservation and effort structures research. A seminar on geo­ thermal strength was once held years in the past to document on paintings in growth on the half-way degree of the four-year programme. the second one overseas seminar, stated during this quantity, was once arrang­ ed to be able to provide a chance to envision the ultimate final result of this neighborhood funding in examine in geothermal strength. This court cases quantity accordingly has major goals: - to offer an review of the result of the group geothermal programme, by way of eighty three formal reviews describing the person study programmes; - to teach how the group examine programme suits into the final context of nationwide and overseas examine on geothermal strength, by way of together with the shows of six visitor audio system who brought the periods and gave keynote addresses.

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Advances in European Geothermal Research: Proceedings of the Second International Seminar on the Results of EC Geothermal Energy Research, held in Strasbourg, 4–6 March 1980

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Additional info for Advances in European Geothermal Research: Proceedings of the Second International Seminar on the Results of EC Geothermal Energy Research, held in Strasbourg, 4–6 March 1980

Example text

Unfortunately, this success was not exploited for purely psychoLogicaL reasons (possibLy linked to pressure exerted by certain vested interests) : the authorities were not psychoLogically prepared to cope with something as new as geothermaL energy. By their very nature administrations tend to resist change, exhibit a certain degree of inertia, are conservative and rarely launch themselves into anything new without approval from higher up. And poLiticians wouLd scarceLy take this sort of gambLe such civic courage is not very common especiaLLy among those peopLe who shouLd, by virtue of their position, exhibit such courage ••• It was not until 1955 in New ZeaLand and then in the United States that high enthaLpy geothermaL energy moved into its second stage of development, a development which was then to embrace the whoLe worLd.

The latter's penetrating power, sensitivity to deep resistivity-contrasts coupled with its fLexibiLity are major advantages where high-enthalpy geothermal energy is concerned. However, the wide variation in signal strength, noise, the unreliability of the model, when there are pronounced lateraL discontinuities, and the channeling of telluric currents in certain sedimentary fillings can cause considerable problems of interpretation, notably at low and very low frequencies. The method known as differential magnetic soundingCwhich, incidentally, has made it possible to characterize the pseudo-continous telluric concentration in the Pyrenees and the Rhine Valley) has prospecting potential on a regional scale, since it enables very extensive conduction anomalies to be located.

The fieLd of constraints and controL the fracturing process. Among the secondary modes of stimuLating the rock which are appLied after hydrauLic fracturing, mention shouLd be made of Leaching and thermal fracturing. The first expLoits the particuLar texture of granite: seLective dissolution of the silicates resuLts in a seLf-propped fracture which obviates the need to circuLate a heat transfer fluid at high pressure. The second results from cooLing the rock and is a method whereby, theoreticaLLy, a fracturing network perpendicular to the hydraulic fracture -32- is deveLoped as a resuLt of the tensiLe stresses due to contraction of the rock voLume.

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