Petrophysical characteristics and fluid flow in the Derdere formation around Beşikli - Tokaris fields, SE Turkey

Tandırcıoğlu, Ahmet
The study area is located in southeast Turkey, mainly in the Petroleum Districts XI and XII. Major oil fields in the area produce oil from the Upper Cretaceous Derdere Formation, one of the most extensive and well-developed reservoir formations in southeast Turkey. In this study, petrophysical characteristics and the formation water flow in the Derdere Formation are determined using the data from well logs, core analyses, well tests and chemical analyses of the formation water. In addition, an attempt is made to explain the reasons of unexpected absence of oil in the exploration wells drilled to the north and northeast of the producing oil fields Tokaris, İkizce, Beşikli, and Doğu Beşikli. Three major lithofacies in the Derdere Formation are recognized from well log data. The best distinction of the lithofacies is observed on the density- neutron crossplot. Lithofacies- 1, found at the lower part of the Derdere Formation, shows the characteristics of a good source and seal rock. Petrophysical characteristics indicate that Lithofacies-2, composed of indolomites, is the best reservoir rock and can be considered as a continuous flow unit. Lithofacies-3 consists of bioclastic limestones with high porosities; however, permeabilities in this lithofacies are low due to the vuggy/moldic nature of the porosity type. The flow direction of the Derdere formation waters is mainly from east towards west and southwest. Total dissolved solid, sodium chloride, chloride, sodium and calcium concentrations of the Derdere Formation waters increase along the flow path towards west. On the other hand, bicarbonate concentrations show a general decrease towards west. Moreover, HC03-Na type water with negative index of base exchange values is found in the eastern part, indicating active hydrodynamic conditions and effects of meteoric water, whereas Cl-Ca type water indicating isolation from the effects of the meteoric water and hydrostatic conditions, is found in the Derdere formation waters of the oil fields located in the west. Consequently, the absence of oil in the eastern part of the study area can be a result of the active hydrodynamic groundwater percolation within the Derdere Formation towards west and southwest, where the oil fields are present.


Major and rare earth element contents in sedimentary rocks of the Haymana formation, Ankara, Turkey
KOÇ, ŞÜKRÜ; SARI, ALİ; Cimen, Okay (2016-01-01)
The study area is located 4 km east of Haymana, Ankara, Turkey. Major and rare earth element (REE) contents in samples collected from siltstone, carbonaceous claystone, and marl of the Haymana formation in the studied region and their distribution with respect to lithology and correlation relations yield important data on the evaluation of forming conditions of basin. Regarding the abundance of elements in various lithologies, the first and second group elements (SiO2, Al2O3, Na2O, TiO2, P2O5 and Fe2O3, K2O...
Integrated Watershed Management for Lake Mogan with the focus of Agricultural Diffuse Pollution
Özcan, Zeynep; Başkan, O; Düzgün, Hafize Şebnem; Kentel, Elçin; Alp, Emre (2015-09-25)
Lake Mogan located 20 km south of Ankara, Turkey has a watershed area of 970 km2, and it is dominated by areas with dry agricultural practices (50%) and graze lands (31%). Intense agricultural activities and fast urbanization rates are the most important factors affecting the water quality in Lake Mogan. There has been several management alternatives suggested to improve the water quality in Lake Mogan. In 2008, the municipality implemented lake augmentation strategy to increase the water level since it dro...
Sustainable management of Mogan and Eymir Lakes in Central Turkey
Yagbasan, Ozlem; Yazıcıgil, Hasan (2009-01-01)
Mogan and Eymir Lakes, located 20 km south of Ankara in Central Turkey, are important aesthetic, recreational, and ecological resources. Dikilitas and Ikizce reservoirs, constructed on upstream surface waters, are two man-made structures in the basin encompassing an area of 985 km(2). The purpose of this study is to quantify groundwater components in lakes' budgets and to assess the potential impacts of upstream reservoirs on lake levels for sustainable management of the system. Available data have been use...
Tectonic evolution of the Cretaceous Ankara Ophiolitic Melange during the Late Cretaceous to pre-Miocene interval in Central Anatolia, Turkey
Rojay, Fuat Bora (2013-04-01)
The chaotic tectonic belt, which is distinguished in northern Anatolia, is called the - Ankara Accretionary Complex - in the Ankara region, central Anatolia. The belt is differentiated into three imbricated tectonic subbelts, namely, pre-Triassic metamorphics, Melange with calcareous blocks and Cretaceous melange with ophiolitic blocks (Ankara Ophiolitic Melange).
ERLER, A (Elsevier BV, 1989-04-01)
The Madenkoy-Siir region lies in southeastern Anatolia, Turkey to the northeast of Siirt. The study area is in the southeastern Anatolian Thrust Belt, which forms the boundary between the Border Folds on the northern edge of the Arabian plate and the Taurids. In the region, limestones of the Midyat Group of Eocene-Miocene age and alternating marls and sandstones of the Lice Formation of Early-Middle Miocene age are the autochthonous units. Three thrust slices were emplaced over the autochthonous units durin...
Citation Formats
A. Tandırcıoğlu, “Petrophysical characteristics and fluid flow in the Derdere formation around Beşikli - Tokaris fields, SE Turkey,” Ph.D. - Doctoral Program, Middle East Technical University, 2002.