Delineation of the Aquifer in the Curin Basin, South of Zahedan City, Iran

摘要

Resistivity method using 596 Schlumberger vertical electrical soundings along 26 profiles are conducted in theCurin basin, Iran to investigate the sub-surface layering and aquifer characteristics. The results of quantitative and qualitativeinterpretation of data reveal four layers. The true resistivity of the top soil varies from 3 to 800 ohm-m while the thicknessvaries from 0.5-15 m. The second layer (dry alluvium) is thicker than the surface layer with resistivity values less than 100ohm-m. The third layer, which constitutes an aquifer, has resistivity values of less than 10 ohm-m and depth values of lessthan 30 m in most locations. The maximum depth of aquifer is 60 meters in the northwest and southeast portion of the studyarea. The fourth layer (bedrock) is characterized by two electric resistivity values ranges. In most parts of the area, it is morethan 60 ohm-m, corresponding probably to slate, while in other areas, it is less than 60 ohm-m, corresponding probably toshale. Finally from the quantitative interpretation of VES curves, the limits of the aquifer were determined.