Geothermal Study Of Reunion Island- Audiomagnetotelluric Survey
From Open Energy Information
Journal Article: Geothermal Study Of Reunion Island- Audiomagnetotelluric Survey
AbstractIn 1979 and 1980, 535 magnetotelluric soundings using a frequency range of 1700 Hz-8 Hz were performed on the island of Reunion for geothermal exploration. Few direct hot-water discharges were observed. Consequently, geophysical methods, particularly the audiomagnetotelluric method, were used extensively. Favourable geological conditions for this method were encountered and the results, which were controlled using classical electrical methods on test areas, suggest an unusual distribution of resistivities for lava flows situated above suspected geothermal areas. These layers progressively decrease in resistivity down to a very conductive layer. In areas where these conductive layers were nearest the surface, detailed studies were carried out showing a close correlation between decreasing resistivity and increasing hydrothermal alteration. In addition, gradient wells reveal high geothermal gradients in such areas. The conductive layers revealed by audiomagnetotelluric soundings seem to correlate with thermal effects creating progressive hydrothermal alteration from an inferred hot-water reservoir up toward the surface.
- Y. Benderitter and A. Gerard
- Published Journal
- Journal of Volcanology and Geothermal Research, 1984
- Not Provided
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Y. Benderitter,A. Gerard. 1984. Geothermal Study Of Reunion Island- Audiomagnetotelluric Survey. Journal of Volcanology and Geothermal Research. (!) .