Study of Groundwater in the Kelvanaq Region (Heris- East Azerbaijan) by Geophysical Method

Necessity of the human to the safe and permanent water sources is one of the important problems today, especially in Iran that is a buried region. One of the permanent water sources is groundwater. In the last decades, soft rock aquifers of country mainly are used; therefore, this causes to exploration the groundwater in the hard rocks. Tectonics and faults one of the important factors to crush the rocks and formations and make and develop the faulted aquifers. Therefore in this study the role of the structures is researched in development of the water sources in Kelvanaq city area. This city is in the South of Heris city that located in the North of the Ajichai River and its main subdivisions are middle part sources of this river that itself sourced from Ghare-Dagh Mountains. In this study, first field studies, geological maps and search in remote sensing and photo maps help to select area have active tectonics in relation by active faults. Study the hydrologic specifications of the basin, in connection by high potential regions of groundwater are guided. After, geophysical methods helps exploration, and geoelectrical sections and pseudo-sections are shown the fault related aquifers and their developments. Research and compare the resistivity maps and sections in this study, shown the extent of aquifers and shown that in the eastern and north-eastern part of the study area, resistivity are mainly very low and are in 10-15 Ὡm range, that are in relation by impermeable clay and marl stones of Red-Formation. Geophysical exploration results have shown that the northern part of the study area mainly formed by impermeable or low-permeable hard rocks, and faults of the study area mainly are impermeable or low-permeable fault zones. But study and compare the results have shown that high potential regions are in the southern parts of the region. Finally in relation by the explored aquifers, location of the number 26 and 30 geoelectric wells, respectively proposed for drilling. Large thickness of the explored faulted aquifer and its specifications, promising good Q for the proposed wells.