Predicted Subsurface Temperature Distribution Maps for Turkey

Abstract

Istanbul Technical University is conducting a study on assessment of the moderate and high temperature geothermal resources of Turkey. One of the phases in this study is to construct subsurface temperature distribution maps at various depths. The constructed maps will be a guide to show the favorable promising hot regions.

Computed temperature distributions based on gradient values are used to obtain the subsurface temperature maps for 500 m and 1000 m depths. The maps are built using Arc GIS software and geostatistical methods.

Two data sets were used to obtain the maps. Data Set 1: 420 data points obtained from the wells with at least a depth of 1 km and Data Set 2: 555 data points obtained from 100/150 m relatively shallow wells.

Variogram models by using computed subsurface temperature values are established, and then predictions are made using some geostatistical (IDW, kriging) methods.

Finally, the maps were illustrated both for regional base and whole country, and the maps were compared with each other by using different geostatistical techniques. All maps were made by using the Geostatistical Analyst extension to ESRI ArcGIS software.