Niğde Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

Yazarlar: Semiha İLHAN, Ali Furkan KABAK

Konular:Mühendislik

DOI:10.28948/ngumuh.502173

Anahtar Kelimeler:Hydrothermal alteration,Geothermal,Alasehir

Özet:    Alasehir (Manisa-TURKEY) geothermal field consists of Paleozoic aged schist, gneiss and crystallized limestone which is in the Gediz Graben. Alasehir Subbasin, which is located in the Gediz Graben at the Western Anatolia, is an area that consist of crosscutting grabens of NE aligned Early-Mid Miocene and E-W aligned Pliocene. With continental extension during Late Miocene and escape tectonics during Pliocene the crust became thinner and heat gradient increased and created today’s geothermal system. Brittle characterized marble, calcareous schist, and quartzite, within the Menderes Massive, when in relation with fault show reservoir rock characteristics. Also, schists and Neogene aged clastics and lacustrine sediments within the massive form seal rock. The purpose of this study is to determine the characteristics of the hydrothermal alterations of the rocks in the Alasehir Region and their relation with thermal water. Specifically, hydrothermal alteration zones which are commonly observed in the geothermal fields are highly important in exploration studies. Alterations, which are observed in the surface alterations and drilling samples, are the indicator of geothermal capacity and can also be used to interpret the reservoir temperatures preliminary. Considering the geology and tectonics of the study area surface alteration and hydrothermal alteration minerals from the wells are examined and it is found out that; chrolitization, sericitization, silicification, carbonification etc. alterations are common and these alteration zones are directly related to the faults.

---