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EAGE International Conference on Petroleum Geology and Hydrocarbon Potential of Caspian and Black Sea Regions
- Conference date: 06 Oct 2008 - 08 Oct 2008
- Location: Baku, Azerbaijan
- ISBN: 978-90-73781-58-0
- Published: 06 October 2008
1 - 20 of 75 results
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Results and Perspective Directions of Prospecting and Exploration Operations Conducted Within Onshore and Offshore Territories of the Azerbaijan Republic at the Beginning of the XXI Century
By A. NarimanovOil and gas-bearing suites are determined in large stratigraphical range of geological structure of the onshore and offshore territory of the Azerbaijan Republic starting from Aalenian subdivision of the Middle Jurassic epoch to the Absheron subdivision of the upper Pliocene. Moreover, middle Pliocene is the basic oil and gas-bearing suite (productive layer) and it prevails according to specific gravity of potential resources and oil and gas-bearing prospectivity. 239 prospecting and exploratory operations have been conducted within the sea water area and onshore territories and 122 oil and gas-bearing areas have been discovered and circa 2 billion ton oil and gas condensate have been produced so far. Recoverable reserves of hydrocarbons with remaining industrial importance is 400 mm t; potential reserves – 300 mm t and resources recoverable from the faults prepared for deep exploration drilling with complex geophysical methods comprise 1700 mm t. They show that there are great opportunities for the prospecting and exploration of the oil and gas fields within the onshore and offshore territories of the republic.
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Oil and Gas Exploration in Western Black Sea – History, Results and Prospects
More LessBetter explored part for hydrocarbons in Black Sea until now is the Western – Northwestern zone. The studied portion of Western Black Sea covers the area westwards of line Istanbul –Odessa. This region comprises entirely the offshore zones of Bulgaria and Romania, the most south-western part of Ukrainian offshore and the most western portion of Turkish offshore. The real hydrocarbon exploration in Western Black Sea offshore has started from beginning of 1970s. Totally thirteen (13) oil and gas discoveries have been made until now. On the base of exploration geophysical and borehole results have been analyzed the deep geological structure, sedimentary basins hydrocarbon features, hydrocarbon systems and prospective trends.
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First Commercial Oil in the Ukrainian Part of the Black Sea
As a result of drilling of the parametric well no 403 on the Subbotin structure on the Kerch shelf of the Black Sea first commercial oil has been revealed in the Ukrainian sector of the sea. Four pay horizons have been discovered in the Maykop (Oligocene) sandstones within a depth range of 2385 - 2646 m.
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Prospects of the Oil-and-gas Presence on Black and Azov Seas Onshore According to Geoelectric Investigation Data
The results of the geological and geophysical and reconnaissance geoelectrical investigations in the perspective for the oil and gas areas in the Odessa, Kherson regions and Kerch peninsula are given. The express-technology of "direct" searching and prospecting for hydrocarbon deposits by geoelectric methods are used during this investigation. The technology includes the method of formation of short-pulsed electromagnetic field (FSPEF), flux-meter survey and method of vertical electric-resonance sounding (VERS). Integrated application of these methods allow to find and map the "deposit" type anomalies (DTA), and to define the total thickness and bedding depths of anomalous polarized layer (APL) of the "oil", "gas", "water" type. The analysis of available geologic-geophysical data, as well as the geoelectric studies results on the known deposit and perspective area of Black Sea onshore territory confirms repeatedly voiced suggestions about Azov and Black Sea region perspectives in plan of the finding and openings of large and average hydrocarbon reservoirs. It is reasonable to raise the intensity of prospecting geological-geophysical investigation for oil and gas in this region.
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Petroleum Systems Dynamics of the South Caspian Basin
Authors A. Javadova, G.W. Riley, N.R. Abdullayev, T.J. Green, H. Doran, G.W. Riley, N.R. Abdullayev, T.J. Green and H. DoranThe South Caspian Basin represents an extremely young petroleum system in which over 8 kilometres of sediment have been deposited in the past 6-10 million years with up to 3 kilometres in the last 1-2 million years. The high deposition rates have pushed the sedimentary section into significant disequilibrium with respect to temperature and pore pressure evolution. The basin dynamics are expressed in: (1) rapid, vertical and lateral pressure changes that challenge the capacity of seals to build and preserve petroleum columns and (2) in low temperature gradients which delay petroleum generation and reservoir diagenetic processes. Basin Modelling has proven to be the key technology in understanding the South Caspian Basin dynamics and quantifying their impact on petroleum generation, migration and seal capacity evolution, as well as in assessing prospect drillability and field development options.
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Hydrocarbon Potential of Oligocene-Miocene Sediments of the SE Greater Caucasus and Talysh – A Comparative Analysis
Authors A.A. Feyzullayev, S.V. Abbasova, M.F. Tagiyev, S.V. Abbasova and M.F. TagiyevThe presentation is devoted to comparative analysis of qualitative and quantitative characteristics and maturity of organic matter (OM) in Oligocene and Miocene rocks cropping out at SE termination of the Greater Caucasus and Talysh mountains, which bound the South Caspian Basin (SCB) on NW and SW, respectively. It was found that from north to south total organic carbon (TOC) and S1+S2 hydrocarbon yield of pyrolysis decrease and alteration from oil generative to predominantly gas generative properties takes place in OM. In the same direction increases OM maturity. The obtained results are consistent with the results of exploration carried out on the western flank of the SCB. An inference is made on the low prospects of oil presence in adjacent south part of Baku Archipelago.
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A Quick Way of Ranking Prospects in the South Caspian Basin, According to Their Hydrocarbon Charging Potential
Authors F. Chapelle, M. Sacleux, C. Cassaigneau, M. Sacleux and C. CassaigneauThe renewed exploration in the Azerbaijanese part of the South Caspian basin has resulted in only one commercial discovery out of the 14 structures that were drilled during the last 15 years. This presentation shows how a simple pseudo 3D Genex modelling demonstrates the sensitivity of the traps hydrocarbon charging to the relative timing of their formation (ie individual structure growth), and of the source rocks maturation and HC migration. Although this does not come as a surprise, the very rapid sedimentation rate and structural growth in the South Caspian Basin, make a critical requirement of a very accurate understanding of both their dynamics. The method has been applied on a basin scale for the two main source rocks: Maykop and Diatom, and the most prolific Pereryv/Fasila target; although it does not take into account all factors of success, it provides a ranking tool for the exploration risk associated with trap charging. Examples of application on a few structures are shown, which can explain respective exploration outcomes, both in terms of presence of Hydrocarbon, but also in terms of their gas versus oil nature.
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Geologic Setting, Depositional Environment and Hydrocarbon Potential, Absheron Peninsula, Hovsan Area,PS, KaS
Authors Y. Shikhaliev, H.Y. Gauzer, N.Y. Gauzer, R.K. Khayrulin, H.Y. Gauzer, N.Y. Gauzer and R.K. KhayrulinThe paper is focused on HC- charged KaS geologic setting and depositional environment within Hovsan area based on integrated seismic and log data. The study has been performed with applied proprietary REZAYR software package to process and interpret seismic lines and well data.
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Regional Geology of the Greater Caucasus - New Insight from Seismic Data
By K. SobornovOil industry seismic data acquired in the late 1980-1990s has contributed considerably to the understanding of the chronostratigraphy, depositional settings, structural architecture and evolution of this fold belt. The new subsurface data has shown diversity of structural styles in the Caucasus and documented much wider development of thrust faulting. A north-vergent foreland thrust belt has been identified in the Northeastern Caucasus. Pre-Alpine fold structures have also been imaged in the northern foreland. These data provide some further amendments to the geological model of the Greater Caucasus.
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The Subsidence Evolution of the South Caspian Basin
More LessThe basement surface of South Caspian Basin lies at a depth of 25-30km. The thickness of the crust beneath the western and central parts of the basin is as little as 8-10 km. Seismic and gravity data indicate that the basement subduction under the Eurasian plate in the Middle Caspian. The rapid subsidence phase is of compressional origin and subduction model provides comparable amplitudes of subsidence. Analysis of available geophysical data made it possible to conclude that onset subduction is the cause of rapid Pliocene-Quaternary subsidence of the crust.
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Tectonic Development of the Precaspian Basin
Authors A.M. Nikishin, K.O. Sobornov and K.O. SobornovWe can recognize the following stages of the Precaspian basin development: (1) Ordovician – rift phase; (2) Silurian to early Devonian – postrift subsidence; (3) Middle Devonian to Frasnian – main rift phase; (4) late Frasnian to Tournasian – postrift subsidence; (5) Carboniferous to Permian – postrift subsidence complicated by foreland basin origination for the Uralian and Scythian orogens; (6) Triassic – regional synrift subsidence; (7) late Triassic to Hettangian – synorogenic sedimentation and regional erosion; (8) Jurassic to Eocene - regional platformal sedimentation; (9) Oligocene to Quaternary – synorogenic sedimentation and erosion. Ordovician and Devonian rifting took place in a back-arc tectonic environments. Since the Late Devonian the basin was a deep-water trough. The Carboniferous to Permian history of the basin was a combination of postrift subsidence and foreland basin development. We discuss main possible reservoirs and hydrocarbon system of the Precaspian basin.
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Structural-geodynamic Map of the Black and Caspian Seas Region
Authors V.V. Yudin, A. Kitchka and V.V. YudinIt has been compiled a new structural-geodynamical map of the Black Sea-Caspian Seas region of 1:2500000 scale, paleotectonic sections along the Anatolia-Crimea-Donbas meridian, and maps of divergent stages of the tectonic evolution using palinspastic restorations. On the basis of principles and tectonic relationships of the actualistic geodynamics it has been described 6 main stages of the region evolution from Precambrian to Neogene one. Also It has been recognized and traced 9 collision sutures of various ages that control the spatial location of the paleo-oceanic subduction and the collision foredeeps and backdeeps, convergent magmatism and fold-overthrust structures governing the hydrocarbon traps. This new model allowed delineation of some new petroleum-prone zones and structures within the South of Ukraine.
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Global Positioning System Measurements of Crustal Deformation in Azerbaijan
Authors F.A. Kadirov, R.E. Reilinger, S.C. McClusky, A.H. Gadirov, R.E. Reilinger, S.C. McClusky and A.H. GadirovGPS observations in Azerbaijan and surrounding areas are providing quantitative constraints of the geometry of active fault systems, and rates of present-day deformation. West of 48° E longitude, the Main Caucasus Trust Fault (MCT) follows the sharp change in slope along the south side of the Greater Caucasus as is well known from prior geophysical and geologic studies. However, east of this longitude the MCT turns sharply to the south, crossing the Kura Depression and extending along the western side of the Caspian Sea (West Caspian Fault; WCF). While the MCT is predominantly a thrust fault west of 48°E longitude, the WCF is a pure right-lateral, strike slip fault with a slip rate of 11 ± 1 mm/yr south of the Absheron Peninsula. The rate of convergence on the MCT decreases from east to west from 10 ± 1 mm/yr at 48° E longitude to 4 ± 1 mm/yr. The present-day pattern of horizontal motions in aggregate suggests that the Lesser Caucasus and Kura Depression are rotating coherently in a counterclockwise sense about a pole located near the NE corner of the Black Sea, resulting in the observed W to E increase in the rate of convergence along the MCT.
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Geodynamic Processes Role at Diapiric Fold Formation of Absheron Oil and Gas Bearing Structures
Authors B.S. Aslanov, E.N. Khalilov and E.N. KhalilovArticle is devoted to a role of geodynamic transformations in formation and evolution diapiric folds of Absheron oil-and-gas-bearing region area. In particular, it is a question about Tyurkan block of structures Gala-Tyurkan-Govsan. Numerous materials about this structure on the basis of which among scientists and experts the certain opinion on a tectonic structure was formed are published. More than century on Gala block of this structure high-quality oil is extracted, and for today a perspective reserves isn't exhausted in this.
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Seismic Mapping, Stratigraphy and Subsidence in the South Caspian Basin, Azerbaijan
Authors T.J. Green, N.R. Abdullayev, J. Hossack, G.W. Riley, A.M. Roberts, T.J. Green, J. Hossack, G.W. Riley and A.M. RobertsThe South Caspian Basin is believed to contain more than 20 km of Mesozoic and Tertiary sediments deposited on oceanic or thinned continental crust. The Pliocene to Recent sequence has been mapped on a regionally extensive grid of 2D seismic data and penetrated by recently drilled exploration wells and is over 7 km thick. Most of this sequence (6 km) is formed of fluvial-lacustrine deltaic sediments of the Pliocene Productive Series that are deposited unconformably above a marine Miocene shale sequence and form the principal hydrocarbon reservoirs in the basin. The thickness of the Pliocene sedimentary sequence implies that relatively rapid, late Tertiary subsidence occurred in the South Caspian Basin. Modelling presented in this paper suggests that it is possible to account for the observed pattern of subsidence and sedimentation in the South Caspian Basin by a process of sediment loading and compaction on a thermally-subsiding, late Mesozoic crust. The Pliocene Productive Series is interpreted to have been deposited in a topographic depression, isolated from the global oceanic system, in which base-level was controlled by local factors rather than by global sea-level.
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Principal Stages and Specific Features of Geotectonics in the Northern Part of the Middle Caspian
Authors S.V. Delia, I.N. Kerusov, S.S. Kosova, S. Shilkin, S.V. Delia, I.N. Kerusov and S.S. KosovaAs concerns the tectonic structure of the north of the Middle Caspian there are still some debatable issues related to a complex structure of the territory near the interface of different-age large elements of the Earth’s crust – Russian and Scythian plates. The geotectonics of this water area was analyzed on the basis of structural maps prepared by PetroAlliance Services Company for LUKOIL oil company. At the first stage that began in 1996 the investigations were based on the results of 2D seismic surveys as well as previous integrating works. From 2002 the 3D surveys had been carried out in the region. Therefore, the results of 2D and 3D seismic surveys enabled for the first time in the Middle Caspian area to identify the constituent elements of the basement, to reconstruct the history of development of large Rakushechno - Shirotnay ridge and their elements. The 3D data helped to justify a complex system of strike-slip faults in the sedimentary mantle, their nature, origin, formation stages and their controlling effect during formation of multi-layer deposits.
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Caspian Block Structure - Origin and History of Geological Development
Authors K. Taskinbayev, O. Obryadchikov and O. Obryadchikov1.The Near Caspian hollow is developed as the uncompensated depression by deposits on Paleozoic top. Here there were large atoll like carbon bearing solid mass in height almost 1,5 km. Absence at their tops the top Paleozic adjourements are explained none sediment of deposits in connection with immersing of territory in the middle Bashkir, in low level of shallow carbon bearing sedimentation. 2. At the end of Sakmarian century right-hand displacement of Scythian-Turan plate in the western has blocked connection of Near-Caspian with Paleo-ocean Tethys, that in Kungurian century has led to accumulation of powerful salts. Therefore Average and Northern Caspian sea are as a part of Scythian-Turan plate. 3. In the end of Paleozoic Scythian-Turan plate has broken up and its Turan part on sinistral shift was displaced in a southeast. At this time there emerged a Caspian plate. 4. Orogen Caucasus has emerged lodged between plates - Caspian and Black Sea. The specified geodynamic events in the Caspian region were reflected in its oil and gas content features.
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Geological Structure, Geodynamic Evolution and Hydrocarbon Potential of NE Black Sea Region
Authors V. Verzhbitsky, E. Frantzen, L. Lobkovsky, E. Frantzen and L. LobkovskyHere we present the synthesis of available geological and geophysical data in order to discuss the present-day structure, geological history and hydrocarbon potential of northeastern Black Sea region, including Shatsky Ridge, Tuapse Basin, Western and Eastern Black Sea basins. Regional geology and Mesozoic - Cenozoic geodynamic evolution are considered.
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Deep Structure and Geodynamics of the South Caspian Basin
By M.V. RodkinThe geological and geophysical data available on the structure of the South Caspian Basin suggest that the upper mantle of this region includes a thick low velocity presumably fluid-saturated layer descending from the Apsheron Threshold under the Alborz Ridge. This zone may correspond to the upper sedimentary layer of the subduction zone connected with subduction of the South Caspian basin beneath the Alborz Ridge. The fluid-saturated layer appears to be the main source of deep aqueous and hydrocarbon fluids connected with the formation of marine seeps, mud volcanoes, and oil-gas reservoirs numerous in this region. The active discharge of the deep fluids in connection with the strong dependence of intensity of the deep fluid flows from the permeability of the corresponding deep fault zones can explain such phenomena as a power-law distribution of the gas and oil field stocks in different deposits and a process of recent refilling of oil and gas reservoirs.
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Identification of Multiple Onshore and Offshore Petroleum Systems in the Central Caspian Region
Authors G.W. van Graas, M.A. Abrams and M.A. AbramsDetailed geochemical analysis of oils, condensates and source rocks from the Central Caspian area allows for the identification of multiple petroleum systems, some of which extend from the onshore Dagestan to onshore Mangyshlak. Most of the petroleum systems are of Mesozoic age, but they are flanked by a Tertiary PS to the south and a Paleozoic PS to the north.
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