Geological and Hydrogeological Investigation of Kozluk-Taslidere (Batman) Geothermal Field

Abstract

Geological, hydrogeological and geochemical investigation of Kozluk-Tasl?dere (Batman) geothermal field was performed in April-May periods of year 2001.

The area in which the spa takes place located on the vicinity of Bitlis-Zagros Suture Zone. The geological units crop out in the study area from older to younger are: Bitlis Metamorphics, C¸ng¸? Formation, F?rat Formation, Lice Formation, Selmo Formation, Yaprakl? Formation and Alluvium.

Ta?l?dere thermal fluid is discharging from the well coded Selmo-32 A drilled by Shell Petroleum Company has depth of 2400m.The hot water is colorless, no smelling, scaling, and leavin down yellow-brown colored sediments, has flow rate at 16 l/s with 83 ?C temperature.
When the information related to the well Selmo-32A are investigated, it is observed that the well was cased down to the depth of 2172m. The hot water upflows from the below of this depth .But, the lithologies in the drillhole indicate that the reservoir seems to be between 1700-2400 m depths.

Hydrogeologically, the reservoir rocks in the region are; dolomites and limestones of the formations in Mardin Group (moderate-to good) and in Sinan Formation (moderate), limestones of Hoya and F?rat formations (moderate), conglomerate and sandstone levels of Selmo Formation (weak to moderate). Impermeable sedimentary rocks of Antak, Germik, Lice and Yaprakl? Formations act as cap rocks of the geothermal system.
Hydrochemical characterization of the thermal water show that it is Ca-Na-SO4-Cl type and has total dissolved solids (TDS) around 2090 mg/l.