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Miocene Exploration Plays in the Mersin Basin, Turkish Mediterranean Sea

Songul Yildiz-Ciftci and Yasemin Geze Kalanyuva

Located in the eastern part of the Turkish Mediterranean Sea, Mersin Basin is situated in a geologically complex area. The northeastern part of the Mediterranean is subdivided by northeast to southwest trending major structural features like Missis High, Ecemis and Eastern Anatolian Fault Zone and related fault systems. This complexity is the result of the convergence of the African, Arabian and Lawrasian Plates from Triasic to Recent, during closure of the Neotethys Ocean.

2D seismic surveys with 2 offshore wells in Mersin Basin, 2D seismic surveys with 76 onshore wells in Adana Basin and outcrop analogy from both Adana and Mut Basins have been used to understand Miocene depositional system. Integration of both onshore and offshore geological/geophysical data, different play and prospects were identified for Miocene interval which had been fed in different direction through space and time. Sediment entry points and depositional geometries were controlled by the morphologies created by basin-forming tectonics during Early and Middle Miocene and also the transpressional closure and uplift of the Missis Basin during Tortonian. The presence of different sediment dispersal systems in different time periods show the change in interplay between several principle controls on the depositional framework of the basin fill, the most importantly tectonism, location of basement highs, sedimentation rate/provenance and relative sea-level through time.

Early-Middle Miocene reefal buildups were growing on different basement blocks. Seismic signature is reflecting isolated carbonate geometries where the masking effect of the salt is less or absent. Middle Miocene turbiditic sandstone is one of the clastic reservoirs in the Mersin Basin. These sandstone reservoirs formed between different basement blocks which show distinct channel features trending northwest to southeast. Upper Miocene deltaic sandstone is the other clastic reservoir in the Mersin Basin. The tectonically created depression was filled by rapid deposition of deltaic succesion and the seismic signatures of these Tortonian sediments is characterized by downlaps. As a result, carbonate, turbiditic and deltaic sandstone reservoirs are the prominent targets for Miocene Exploration Plays at Turkish Mediterranean Sea.

AAPG Search and Discovery Article #90161©2013 AAPG European Regional Conference, Barcelona, Spain, 8-10 April 2013