The Late-Tertiary Kalkım Basin, located in the Biga Peninsula, NW part of Turkey, offers a remarkable potential for an exploitable geothermal reservoir. In conjunction with two E-W high angle active faults bounding the basin in the north and south, geothermal waters ascent to surface with temperature up to 84 °C. As a result of pull-apart tectonics and graben-like depressional basin, Neogene to Quaternary cover rock series present in the hanging wall, while Paleozoic-Triassic basement rocks expose in the foot wall. Drilled shallow wells provided a conductive geothermal gradient from 4 to 6 °C/100m within the hanging wall, which evidence to a regional thermal anomaly. As the many of subsidiary members of geothermal system meet in the Kalkım basin, we attempted to build up a preliminary conceptual model to reveal main elements of Kalkım geothermal system; (i) reservoir temperature, (ii) size of geothermal system, (iii) geological settings (iv)Hydrogeology and hydrogeochemistry and (v) heat source. This study involves preliminary interpretation of analytical data from a water sampling survey of 22 locations. The conceptual model is depicted on a N-S resistivity section of 3D magnetotellurics study, together with inferred faults from seismic survey and lithological associations

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