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Seismic Geomorphology of a Tidal Channel System Cutting Through Upper Cretaceous Carbonates, SE Turkey

Sarikaya, Hasan¹; Akalin, A.Hamit³; Yilmaz, Erhan²
¹Exploration, Turkish Petroleum Corporation (TPAO), Ankara, Turkey.
²Research Center, Turkish Petroleum Corporation (TPAO), Ankara, Turkey.
³MF PTC VGV, Statoil ASA, Bergen, Norway.

Tens of million barrels of oil have been produced from the oilfields located in southeastern Turkey since late 1940s. Although surface structures and subsurface structural features were targeted in the early stages of exploration, appraisal and production wells drilled in the newly discovered field were completed with unexpected results that the geological models of the time were failed to explain. Developments in seismic technology enable to image subsurface and to delineate depositional elements in three-dimension. Integration of wellbore data such as cuttings, cores, logs, and production history with three-dimensional seismic data plays an important role for reservoir characterization efforts. The main reservoirs in the study area are the Upper Cretaceous shallow shelf carbonates, namely, the Beloka Formation, the Garzan Formation, and the Upper Sinan Formation. Rudist-build-ups and their talus deposits are productive facies in these reservoirs. A braided tidal channel system is interpreted in the top of the Garzan Formation through seismic attributes, core data and well log. These channels filled with shale and marn, which is also confirmed with well data, may explain lithologic distribution in the area and discontinuity of the reservoir intervals. Seismic geomorphology of these channels enables to shape current development and further exploration strategies by mitigating risks of drilling of non-reservoir formations.


AAPG Search and Discovery Article #90155©2012 AAPG International Conference & Exhibition, Singapore, 16-19 September 2012