Paleocene Volcano-Clastic Sequences in the Tuz Gölü Basin, Central Anatolia, Turkey: An Evolution of Petroleum Reservoir Rock Properties Using Logs

The Paleocene unit of the Karapınar-1/1A and-2/2A wells was studied by subsurface data in the Tuz Gölü Basin. The Karapınar-1/1A well mainly consists of acidic, andesite, and dasite tuff levels, which was determined according to an M-N plot chart. In the Karapınar-2/2A well, dasite tuff is characteristic and some levels have rhyolite, glassy rhyolite tuff, and zeolite tuff properties. In the Karapınar field, formation water salinity is very high (150,000–200,000 ppm), causing low resistivity and porosity values. Petrophysical properties show that tuff sequence total porosity is between 9 and 20%, and the fracture structure indicates that tuff level should be a prospect for hydrocarbon exploration in the Tuz Gölü Basin.