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Résumé

The report explains in detail the concept of the Transiel method. The method is an electrical prospecting method, that has proven its validity for hydrocarbon and mineral exploration. It is based on the polarization that may occur in a formation that is not very conductive but may polarize if a potential is applied. In practice a current is fed into the soil through electrodes that are 1-3 km apart. The potential over a pair of electrodes 200-300 apart aligned parallel to the first set is measured. Square positive and negative pulses are injected separated by a rest period of 4 seconds. The evolution of the potential during these 4 seconds are the transient signals that give information about polarization. The signals are treated qualitatively and this results in a map with positive and negative anomalies. In this study it was attempted to correlate these anomalies with productive and non productive wells. It seems that there is a correlation between productive wells from the top of the carbonate reservoir and a positive anomaly. It is explained by the possible presence of polarizable formations set in place by hydrothermal activity like sulfides, pyrites. The Transiel method can be a valid tool in geothermal exploration if it is a part of an integrated study employing other geophysical methods (electrical, magnetotelluric, seismic reflection etc.).

Informations supplémentaires

Auteurs: DUPRAT A COMPAGNIE GENERALE DE GEOPHYSIQUE, MASSY (FRANCE), COMPAGNIE GENERALE DE GEOPHYSIQUE, MASSY (FRANCE)
Références bibliographiques: EUR 9072 FR (1984) MF, 28 P., 10 PLANS, BFR 1320, EUROFFICE, LUXEMBOURG, POB 1907
Disponibilité: Can be ordered online
Numéro d'enregistrement: 1989122011000 / Dernière mise à jour le: 1987-01-01
Catégorie: publication
Langues disponibles: fr