Signification de la présence de radon 222 dans les fluides géothermiques |
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Authors: | F D’Amore J C Sabroux |
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Institution: | 1. CNR - Istituto Internazionale per le Ricerche Geotermiche, Lungarno Pacinotti 55, 56100, Pisa, Italie 2. Départment de Protection, Service Technique d’Etude de la Pollution dans l’Atmosphère et dans les Mines, Commissariat à l’Energie Atomique, B.P. no. 6, 92260, Fontenay aux Roses, France
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Abstract: | The222Rn content of a subterranean fluid depends on the physico-chemical nature of the media through which the fluid passes and on the time spent by the fluid in the various geological formations encountered. Consequently,222Rn measurement in a geofluid gives a clue to the subsurface transport conditions of this geofluid. Simple models are proposed for various types of buried structures connected with the surface by a geothermal well; they all lead to the222Rn concentration expressed as a function of the flow-rate of the carrier fluid. In real systems, the variations of this concentration with flow-rate would allow the type of structure feading the well to be determined, and, in propitious circumstances, the volume of the possible reservoir to be estimated. |
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