Abstract: The study was made on the farm of Ercüment Özbaş, who hadnotified the presence of oil indications on his farm, located in Söke.The area is covered by the following secies: gneiss-micaschist ,and metamorphosed limestone of Menderes group, at the bottom; this group is overlain by thesandstones, limestones, conglomerates, ,and fossiliferous sands of the Miocene age ,and, overlying these sediments, are found some fossiliferous sands ,and alluvium.The Menderes group represents the main rock of the area, which had solidifiedat the beginning of the Primary; probably orogenic actions took place during theCaledonian ,and Antecambrian. From the end of Paleozoic until the beginning ofMiocene, the area was above the sea level. At the beginning of Miocene the area wascovered by a sea.As a result of Alpine movements, a vertical subsidence of thick sediments tookplace during Miocene. These tectonic actions continued also during the Pliocene.Because of this tectonic activity, the area is fractured and faulted. In this area themagmatic activity has also taken place.The area does not contain any important geological structure / reservoir rocks.Therefore, it is impossible to expect here any economically important oil deposits.The natural gas-which was found during the drilling for water in the Özbaşfarm- has the following characteristics: it is colorless ,and odorless ,and has a lowpressure. This kind of gas is usually produced by the decomposition of the organicmaterial within the layers of Quaternary sediments ,and is accumulated in the pockets, which are usually found in these sediments. The gascontaining pockets are generally surrounded by impervious argillaceous sediments, which do not permit thegas. to escape. This gas is found under thick recent sediments, which compress thegas in the pockets. When these pockets are drilled, the gas-relieved from the highpressure-escapes the hole.The gas found in Söke, being of the similar origin, is an unimportant, burningswamp gas.