Temperature profiles in geothermal systems L. Guillou-Frottier, BRGM, France Engine Launching Conference, February 14 th, 2006.

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Presentation transcript:

Temperature profiles in geothermal systems L. Guillou-Frottier, BRGM, France Engine Launching Conference, February 14 th, 2006

> 2 Temperature profiles in geothermal systems > Examples > Heat conduction processes > Heat convection processes > Conclusion

> 3 Examples of temperature profiles Several distinct processes can create shallow thermal anomalies... After Muraoka et al., 2000

> 4 At least 4 possible causes - high heat producing granite - insulating cover - magma reservoir - hot fluids at shallow depths In these cases, the shallow thermal anomaly is not related to shallow convective processes.

> 5 > Role of an insulating (sedimentary) cover Case of Soultz-sous-Forêts (France) Pech. Dol. K + Mush Mush+Bund. Bund. Granite z Thermal conductivity } T° profile in the upper part can be explained by thermal conductivity contrasts Schellschmidt & Clauser, 1996 Schellschmidt et al., 1997

> 6 > Role of a high heat production granite Grecksch et al., 2003 SOULTZ High heat production can also account for one part of the excess temperature

> 7 > Hypothesis of a cooling reservoir Case of Bouillante (Guadeloupe, French West Indies) Negative T° gradient ! BO-4 (1996)

> 8 > Hypothesis of a hot upwelling in a porous media T(z) = f(u, k, r, Cp, z)

> 9 Temperature profiles in a convective system Labioratory experiments by Guillou & Jaupart, 1995

> 10 Measurements of temperature profiles (lab. experiments) Profiles at different locations (above and near one upwelling) 3 zones can be defined : (1) the purely conductive zone = thermal boundary layer : high temperature gradient (2) zone of a decreasing T° gradient (3) zone of a small / null / negative T° gradient note the existence of negative T° gradients...

> 11 Local temperature profiles in geothermal systems Same observations as in convective systems : - 3 zones - local differences are constant over a large thickness Schellschmidt & Clauser, 1996

> 12 Up- and down-wellings can be inferred from local temperature profiles......however, drawing of isotherms is not sufficient to delineate the reservoir geometry...

> 13 Reservoir geometry and physical conditions could thus be better constrained by careful analyses of temperature profiles.

> 14 Conclusions parts > Simple 1D conductive models show that parts of vertical temperature profiles can be explained > Curved temperature profiles at shallow depths may result from combination of several processes > Scaling laws of thermal convection applied to temperature profiles may help in the characterization of geothermal systems