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Ankara, Turkey

Türkiye Petrolleri Anonim Ortaklığı was founded in 1954 by Law No. 6327 with the responsibility of being involved in hydrocarbon exploration, drilling, production, refinery and marketing activities as Turkey's national company.Being an important actor of the national economy, TPAO achieved many “firsts” of the Turkish oil industry in the past. The Company, its history reaching back over a half century, has given rise to seventeen major companies, including Petkim, Tüpraş and POAŞ to Turkey.Until 1983, as an integrated oil company, it was engaged in all the activity fields of oil industry from exploration to production, refinery, marketing and transportation. Today, TPAO is a national oil company involved in merely upstream sector. Wikipedia.

Ozkan R.,Turkish Petroleum Corporation | Vachard D.,CNRS Evolution, Ecology, and Paleonthology Laboratory
Revue de Micropaleontologie | Year: 2015

A complete Devonian sequence is well exposed in the eastern Taurides, forming more than 1000 m-thick succession of carbonate and siliciclastic sediments. The carbonate succession, stratigraphically ranging from Middle Devonian to early Late Devonian and mostly comprising limestones, dolomitic limestones and reefal limestones, contains abundant and diverse assemblages of foraminifers, corals, stromatoporoids, calcareous algae, bivalves, brachiopods, ostracods, and conodonts. The limestone samples collected from a more closely sampled stratigraphic section have been investigated for their foraminiferal content. The micropalaeontological analyses carried out on these samples have revealed the presence of an early Frasnian foraminiferal assemblage including predominantly unilocular parathuramminid species and multilocular forms of the genera Nanicella, Paratikhinella and Semitextularia? and further indicated the presence of a new genus and a new species Halevikia deveciae n. gen. n. sp. which appears as an important phylogenetic and stratigraphic transitional taxon between the families Baituganellidae n. fam. and Tournayellinidae, the phylogenetic potentiality of which during the Late Devonian is currently probably underestimated. © 2015 Elsevier Masson SAS. Source

Bati Z.,Turkish Petroleum Corporation
Review of Palaeobotany and Palynology | Year: 2015

The South Caspian Basin is a deep Cenozoic basin located in eastern Paratethys along the northern margin of the Arabia-Eurasia collision zone. The basin, with its proven oil and gas reserves, has been the subject of numerous biostratigraphic studies, but most of these studies have concentrated on the Pliocene reservoir rocks. Precise chronological correlations between Paratethyan sedimentary successions and Mediterranean stages have not yet been achieved, although detailed local foraminiferal and non-foraminiferal biostratigraphic studies allow chronostratigraphic division and accurate regional correlations. As a pioneering work, this paper provides a detailed dinoflagellate cyst biostratigraphy of the upper Eocene and lower Oligocene deposits in the South Caspian Basin. A total of 127 dinoflagellate cyst taxa have been studied for the first time from the Eocene Koun Formation and the Oligocene part of the Maykop Formation exposed in the Kirmizitepe Section, Azerbaijan. Three dinoflagellate cyst biozones known from classic areas in central Italy are recognizable in the South Caspian Basin. One (Aal zone) is uppermost Eocene and two (Gse and Adi zones) are lower Oligocene. Thus, although some dinoflagellate cyst species from the studied section have stratigraphic ranges different from those of mid and higher latitudes, others provide correlations with previously defined biozones and dinoflagellate cyst events in the Tethyan realm and northwestern Europe. Dinoflagellate cyst assemblages indicate shallow marine depositional conditions for the latest Eocene. Deeper conditions prevailed during the earliest part of the early Oligocene, succeeded by a pronounced shallowing later in the early Oligocene. © 2015 Elsevier B.V. Source

Sancay R.H.,Turkish Petroleum Corporation
Palynology | Year: 2014

Fossil fungal spores, endemic Paratethyan dinoflagellate cysts, organic-walled algal cysts, spores and pollen are very common in the onshore and offshore Neogene sediments of the Black Sea, Turkey. Amongst these assemblages, the fungal spore form-genus Mediaverrunites Nandi and Sinha 2007, emend. nov., described from Neogene strata from tropical to temperate paleoclimates, commonly occurs in Upper Miocene sediments. The presence of stratigraphically important dinoflagellate cyst and pollen taxa confirms the stratigraphic importance of this genus in the Upper Miocene of the Black Sea. Two new fungal spore species, Mediaverrunites batii sp. nov. and Mediaverrunites pontidiensis sp. nov., are described from Upper Miocene sediments of the Black Sea. © 2013 © 2013 AASP - The Palynological Society. Source

Kaypak B.,Ankara University | Gokkaya G.,Turkish Petroleum Corporation
Journal of Volcanology and Geothermal Research | Year: 2012

The Denizli basin and its surroundings are one of the regions that have high seismic activity and rich geothermal fields in western Anatolia. In the first half of year 2000, an increasing seismic activity was observed around the Denizli basin without a large mainshock occurrence. A temporary seismic network consisting of 28 stations were deployed to observe the seismic activity in the region by The Scientific and Technological Research Council of Turkey-Marmara Research Center-Earth and Marine Science Institute (TÜBİTAK-MAM-EMSI). In this study, one- and three-dimensional V P and V P/V S structure of the Denizli basin have been determined by using the travel times of the 635 recorded earthquake data. Firstly one-dimensional inversion schema was performed to stabilize initial velocity model and to have more reliable hypocentral locations. Then an iterative and simultaneous three-dimensional inversion procedure was carried out to obtain 3-D high-resolution seismic velocity models. Furthermore to assess the solution quality of our inversion, we conducted a series of resolution tests. We concluded high-resolution 3-D V P and V P/V S seismic velocity models for the upper 20km of the crust beneath the Denizli basin and surroundings and interpreted the results in the context of known geologic and tectonic units. The resulting 3-D V P models define the geometry of the basin, sediment thickness, and intrusive magmatic bodies as well as regions of anomalous velocity. The V P/V S models help to constrain the location and geometry of the faults, zones of weakness, and gas or fluid saturated formations with high pore pressure zones. All tomographic results show that there is a strong correlation between local seismicity and the high V P and V P/V S anomalies. Consequently, this relationship indicates that the reason of the high seismicity in the Denizli basin depends on activity of hydrothermal system as well as tectonic regime. © 2011 Elsevier B.V. Source

Ciftci N.B.,Turkish Petroleum Corporation | Bozkurt E.,Middle East Technical University
Basin Research | Year: 2010

The structural evolution of the Miocene to Recent Gediz Graben is intimately related to the evolution of its southern margin. This margin is shaped by a time-transgressive, composite structure that possesses flat-ramp geometry with three separate dip domains: a low-angle shallow segment; a steeper middle segment; and a low-angle deeper segment. This geometry was probably produced by one of two mechanisms, which operated perpendicular to the general trend of the graben, resulting in gradual back-rotation followed by abandonment of the shallow segment as it was dissected by the high-angle normal fault(s). The geometry of the southern margin structure is not simple along-strike. It includes broad undulations and discrete fault segments, developed by large-scale fault growth processes through segment linkage. The along-strike growth of the southern margin-bounding structure is responsible for the composite character of the Gediz Graben and controls the observed stratigraphic variability. Two sub-basins aligned with the major segments of the southern graben margin structure have been investigated. The Salihli and Alaşehir sub-basins comprising 3000 m sedimentary thickness are separated by an intervening basement high, that is covered by a thin veneer of post-Miocene sediments. The two sub-basins, which evolved as isolated basins during most of the graben history, amalgamated during post-Miocene time to form the composite configuration of the graben. There is a general east to west trend of growth for the Gediz Graben. © 2009 The Authors. Basin Research © 2009 Blackwell Publishing Ltd, European Association of Geoscientists & Engineers and International Association of Sedimentologists. Source

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