OJG  Vol.4 No.10 , October 2014
Cyclostratigraphy Data as a Proxy for Geoelectrical Data Interpretation: Application to Phosphate Minerals Exploration in Matam (Senegal)
ABSTRACT
The vertical electrical soundings on the Matam region phosphates deposits are interpreted by inversion. To retrieve lithology from the obtained resistivities, mechanical drilling was performed to compare directly the lithologies and the geoelectrical resistivities. The obtained relation is not simple and is not sufficient to interpret all the VES. This situation motivated the collection of supplementary information from cyclostratigraphy. Geoelectrical and cyclostratigraphic information is combined using fuzzy logic techniques to build a fuzzy inference system. The obtained results seem to be consistent with the stratigraphy of the investigated region and allow retrieving lithological succession. Further investigations are necessary for more accurate thickness determination.

Cite this paper
Ndiaye, M. , Coulibaly, S. , Zouwinaba, W. and Ba, I. (2014) Cyclostratigraphy Data as a Proxy for Geoelectrical Data Interpretation: Application to Phosphate Minerals Exploration in Matam (Senegal). Open Journal of Geology, 4, 551-570. doi: 10.4236/ojg.2014.410041.
References
[1]   Chudeau, R. (1916) Le Golfe éocène du Sénégal, Bulleting SGF. Paris (4) t. 16, 303-308.

[2]   Baud, L. (1938) Rapport du 19 mai 1938 sur les calcaires phosphatés de la région de Matam et de Kanel. Rap. MAS, Arch. Dir Mines, Dakar.

[3]   Flicoteaux, R., Lappartient, J., Parron, C. and Popoff, M. (1979) Les formations tertiaires du fleuve Sénégal. Influence des phénomènes diagénétiques et d’altération sur les caractères lithostratigraphiques. Comm. X’ coll. géol. afr., Montpellier.

[4]   Ollier, G. and Mahtis, B. (1991) Lithologic Interpretation from Geophysical Logs in Holes 737B, 738C and 742A. Proceedings of the Ocean Drilling Program, Scientific Results, 1, 263-289.

[5]   Pascal, M. (1986) Les minéralisations phosphatées de la rive droite du fleuve Sénégal. Itinéraires géologiques dans le Sud-Ouest mauritanien. Lab. Géol. Univ. Nice et Ecole norm. sup. Nouakchott, 25-43.

[6]   Noel, J.B., Barusseau, J.P., Roger, J., Dabo, B., Diagne, E., Duvail, C., Sagna, R., Sarr, R. and Serrano, O. (2009) Carte géologique du Sénégal à 1/200 000, feuilles de Matam et Semme, Première édition mars 2009.

[7]   Harper, C.W.J. (1984) Improved Methods of Facies Sequence Analysis, Facies Models: Response to Sea Level Change. Geological Association of Canada, Reprint Series 1, 11-13.

[8]   Jang, J.S.R. (1997) Fuzzy Inference Systems. Neuro-Fuzzy and Soft Computing: A Computational Approach to Learning and Machine Intelligence. Prentice-Hall, Upper Saddle River, 73-91.

[9]   Ndiaye, M., Davaud, E. and Jorry, S. (2014) A Computer-Assisted Method for Depositional Model Determination. International Journal of Geosciences, 5, 178-183.
http://dx.doi.org/10.4236/ijg.2014.52019

[10]   Roberts, J.N. and Schwartz, L.M. (1985) Grain Consolidation and Electrical Conductivity in Porous Media. Physical Review B, 31, 5990. http://dx.doi.org/10.1103/PhysRevB.31.5990

[11]   Niwas, S. and Singhal, D.C. (1981) Estimation of Aquifer Transmissivity from Dar-Zarrouk Parameters in Porous Media. Journal of Hydrology, 50, 393-399. http://dx.doi.org/10.1016/0022-1694(81)90082-2

 
 
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