Geochemistry of Formation Waters from Upper Cretaceous Calcareous Rocks of Southeast Turkey
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Based on TDS classification, FG, KS and, Atatiirk Dam Lake (ADL) samples are of fresh water (0-1000 ppm), Adiyaman (A44) and Cemberlita? (C14) formation water samples are of brackish water (1000-10000 ppm), and other formation waters are of connate water (10000-30000 ppm). Adiyaman formation waters (A32 and A44) have a sequence of rCl>rHCO3>rSO4 and are undersaturated with respect to CaSO4. Formation waters of other oil fields have a sequence of rCl>rSO4>rHCO3 and are oversaturated with respect to CaSO4. Conservative ions in formation waters, such as Cl and Br, were used together with total dissolved solids in determining the evolution of waters and in the evaluation of mixing. In this respect, there is a transition between fresh and connate waters. It is concluded that Adiyaman and Cemberlitas formation waters show greater mixing with fresh groundwaters than other formation waters of the Adiyaman region.
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