Experimental Studies of Rock-Water Interactions Occuring During the Circulation of a Geothermal Doublet in a Carbonate Environment

  • A. Desplan
  • M. Leleu
  • P. Massard
  • J. Rochon
Conference paper


We presented in the Brussels Seminar (1) (December 1977), the results of a theoritical study on chemical reactions occuring in the exploitation of a geothermal doublet.

The conclusions in the case of the MELUN geothermal exploitation (Paris Basin) were as follows:
  • At the production the water is a little supersaturated related to calcite.

  • After the thermals exchanges water become agressive, till the rein jection occurs in the reservoir.

  • The fresh reinjected water dissolves the reservoir up to the saturation with calcite.

  • The water goes through a thermal front (2) and the rewarming causes super saturation versus calcite.

The present study,essentialy experimental, concerns the relations between flow and chemistry, the evolution of the reservoir, and the consequence on the life time of the doublet.

First, the experimental results permit to reach the speed of calcite dissolution and to show in the case of MELUN doublet that dissolution take place in a very short time after the reinjection. The volume of the reservoir influenced, depends on the heterogeneity of this one. The precipitation, wich is only a function of temperature variation, take place at the thermal front, in all the reservoir, during the life of the doublet. Dissolution open heterogeneity, precipitation has not a great effet on reservoir permeability.

An simplificated simulation model, shows that this physicochemicals phenomena have no results on the life time of a doublet located in a calcareous reservoir.


Reservoir Permeability Calcite Dissolution Paris Basin Thermal Front Simplificated Simulation Model 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Desplan A. — Deschamps J. — M. Leleu The geochemical reactions occuring during the exploitation of a geothermal doublet Seminar on geothermal energy. 1977 — BRUSSELS, p. 529–547Google Scholar
  2. 2.
    Gringarten A. — Sauty J.P. Simulation des transferts de chaleur dans les aquiferes Bull. B.R.G.M. (II) section III, n° 1, 1975, p. 24–34Google Scholar
  3. 3.
    S.J. Sjoberg. A fundamental equation for Calcite dissolution kinetics Geochimica Cosmochimica Acta, 1976, V. 40 p. 441–447Google Scholar
  4. 4.
    Roques H. Etude expérimentale de la dissolution des calcaires par une eau chargée de CO2Annales spél’ologie, 1973, 28,4, p. 549–563Google Scholar
  5. 5.
    Berner R.A. — Morse J.W Dissolution kinetics of calcium carbonate IV — Theory of calcite dissolution. An. Jour, of Science. V. 274, 1974, p. 108–134Google Scholar
  6. 6.
    Plummer L.N. — Wigley T.M.L. — Parkurst P.L. The kinetics of calcite dissolution in CO2 — water systems at 5° to 60°C and O. 0 to 1.0 Atm CO2An; Jour, of S-ience V. 278, 1978, p. 179–216Google Scholar
  7. 7.
    Prigogine I. Introduction à la thermodynamique des processus irréversibles. ed. DUNOD 1968Google Scholar
  8. 8.
    Massard P. Approche thermodynamique des phénomènes de dissolutions: aspect cinétique en système ouvert Bull. Soc. Fr. Mineral. Cristallog., 1977, 100, p. 177–184Google Scholar
  9. 9.
    Bear J. Dynamics of fluids in poroux media New-York, American Elsevier, (1972).Google Scholar
  10. 10.
    Sauty J.P. Contribution à l’identification des paramètres de dispersion dans les aquifères par interprétations des expériences de traçage. Thèse Doct. Ing., Grenoble, (1977).Google Scholar

Copyright information

© ECSC, EEC, EAEC, Brussels and Luxembourg 1980

Authors and Affiliations

  • A. Desplan
    • 1
  • M. Leleu
    • 2
  • P. Massard
    • 3
  • J. Rochon
    • 1
  1. 1.Service Geologique NationalBureau De Recherches Geologiques Et MinieresOrleansFrance
  2. 2.Detache B.R.G.M.Centre National De La Recherche ScientifiqueFrance
  3. 3.Laboratoire De GeochimieUniversite De Paris XI OrsayOrsayFrance

Personalised recommendations