Abstract: Natural gas seeps known as Chimaera -Yanartas, found in the Antalya-Çıralı region, are one of the mostimportant hydrocarbon seeps known in the Eastern Mediterranean Region. Natural gas seeps in the region arelocated in the western part of the highly serpentinized Tekirova peridotite nappe, which is a component of the Antalyanappes. The Antalya nappes overlie the Beydağları limestones in the Kumluca region, as well as Tertiary marinesediments filling the Finike basin, with multiple thrust contacts. Tertiary sediments filling the Finike basin consist of clastic and carbonate sedimentary components ranging inage from Eocene to Early-Middle Miocene. The Aquitanian carbonate rocks located at the bottom of the Miocenesequence are mostly composed of thick-layered coral limestones with reef characteristics. Aquitanian reefallimestones in the Finike region, with a thickness of up to 300 meters, have excellent reservoir rock properties due totheir porous texture.Burdigalian sediments, which overlie the Aquitanian limestones with a concordant contact in the Finike basin,are predominantly composed of shale, carbonaceous shale, mudstone and accompanying turbiditic sediments. Theorganic matter-rich sedimentary content of the Burdigalian sequence and the accompanying turbiditic componentsare important as they indicate that this sequence may have very good source rock and cover rock properties.Considering the stratigraphic position, composition and texture of the sediments filling the Finike basin, it ispossible that the natural gas seeps in the Çıralı region are derived from the Early-Middle Miocene Tertiary sedimentslocated under the allochthonous units and may have biotic origin. The fact that all the natural gas deposits foundin the Eastern Mediterranean region up to the present day are located in the Miocene marine sedimentary sequencecan be considered as the most important data supporting this thesis.