Inverse slope method for interpreting vertical electrical soundings in sedimentary phosphatic environments in the Al-Sharquieh mine, Syria

CIM Journal, Vol. 7, No. 2, 2016

J. Asfahani
Geology Department, Atomic Energy Commission, Damascus, Syria

http://dx.doi.org/10.15834/cimj.2016.12
Abstract The inverse slope method (ISM) was applied to reinterpret vertical electrical soundings (VES) data from pits at the Al-Sharquieh phosphate mine, in order to demonstrate applicability and suitability of the ISM for interpreting VES data from sedimentary phosphatic environments. The ISM overcomes limitations of the curve matching method and the complexity of lithological sections. The ISM geo-electrical interpretation results correlated well with lithologies of the pits. This method characterized resistivity and thickness of the phosphatic layer, and identified favourable phosphate-prospecting areas using the newly developed thickness/depth parameter. The ISM is recommended for interpreting VES measurements in similar sedimentary phosphatic regions.
Keywords: Al-Sharquieh mine, Syria; Inverse slope method (ISM); Phosphate; Vertical electrical soundings (VES)
Résumé La méthode d’inversion de la pente (ISM) a été utilisée pour réinterpréter les données de sondages électriques verticaux (VES) effectués dans des puits de la mine de phosphate Al-Sharquieh, afin de démontrer l’applicabilité et la pertinence de cette méthode pour interpréter les données VES dans des environnements de sédimentation de phosphates. Cette méthode (ISM) surmonte les limitations de la méthode de comparaison de courbes et la complexité des sections lithologiques. Les résultats de l’interprétation géoélectrique ISM correspondaient bien aux lithologies des puits. Elle a permis de caractériser la résistivité et l’épaisseur de la couche phosphatique et d’identifier les secteurs favorables à la prospection pour le phosphate en utilisant le paramètre nouvellement développé épaisseur/profondeur. ISM est recommandée pour l’interprétation des mesures VES dans des régions semblables où se trouve du phosphate sédimentaire.
Mots-Clé Méthode d’inversion de la pente (ISM); Mine Al-Sharquieh, Syrie; phosphate; sondages électriques verticaux (VES)
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