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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
21 - 40 of 75 results
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Geochemistry of Maikopan Strata for the Reconstruction of Sedimentology Process on the South Caspian Basin
Authors M. Efendiyeva, S. Hudson, K. Vahabov, S. Hudson and K. VahabovNon-traditional geochemical methods, such as trace metal and stable isotope analysis, are complementary to organic geochemical characterization of this source rock interval, giving a more detailed insight into depositional conditions affecting preservation of organic material. Redox sen-sitive trace metals, 13Corg, %S, and field GR all generally show positive correlation to TOC, while 15N shows a good inverse correlation. Bottom water conditions were suboxic to anoxic throughout the majority of Maikopian deposition, with the basin becoming less anoxic through time according to trace metal abundances. Carbon isotopic ratios suggest that terrestrial input was greatest during the Chattian, and this is further verified by HI values. caused some level of basin isola-tion which was magnified at times of low global sea-level, allowing preservation of organic carbon and redox sensitive trace metals throughout much of this time period. Overall, the data suggest that total isolation of the South Caspian Basin from the Tethys Ocean did not occur until after deposition of Maikopian strata, possibly in the Middle to Late Miocene.
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On the Spontaneous Renewal of Oil and Gas Fields
Authors V.I. Sozansky, J.F. Kenney and J.F. KenneyOil and gas fields are dynamic systems undergoing constant depletion by diffusion, effusion, and chemical decomposition, and renewal by constant influx of new volumes of hydrocarbons. Many oil and gas fields are effectively inexhaustible, they are recharging, but at rates of recharging typically much smaller than the rate of oil and gas withdrawal by production.
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Some Aspects of Formation of Oil Fields in the Productive Series, the South Caspian Basin
Authors A.A. Feyzullayev, M.F. Tagiyev and M.F. TagiyevThere exist two opposite viewpoints regarding formation of hydrocarbon (HC) accumulations in the Lower Pliocene Productive Series (PS) in the South Caspian Basin (SCB). The first states that HCs are syngenetic to this stratigraphic unit, by the second they are of epigenetic origin. This presentation is concerned with results of study of the nature of HCs in the PS based on the modern isotopic-geochemical data and recent theoretical and experimental developments. Quantitative and qualitative parameters of organic matter (OM), geochemical and temperature conditions of its conversion, maturity estimates for oil and gas and revealed vertical zonality of their formation are shown to be against counting the PS as source strata for oil. Formation of HC accumulations in the PS has been associated with Oligocene and Miocene source deposits, contribution of which was subject to variation both in space and time. In this connection subvertical migration played a dominant role, having pulsed (injection) character.
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Degassing of the Northern Black Sea – Gas Seepage and Mud Volcanism
The paper presents the comprehensive review of geological-geophysical studies of gas venting features on the NW shelf and upper continental slope, in the Sorokin trough and on the Kerch-Taman offshore, evidence for the gas emission origin of carbonate associations related to gas emission, characteristics of mud volcanoes.
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Origin of Isotopically Heavy Bicarbonates in Waters of Mud Volcanoes, Azerbaijan
More LessWaters of mud volcanoes in Azerbaijan have been characterized chemically and isotopically. Anomalously heavy stable carbon isotope compositions in bicarbonate component (up to +19.8‰) are interpreted to have a secondary biogenic history. Correlation between CO2 of gases and water bicarbonate support that 13C-enrichment of the HCO3 ions is attributed to anaerobic degradation occur at shallower depths. High content of HCO3 component along with the presence of low-rate mineralized alkaline waters explained that formation occur in open hydrogeological conditions. Groundwater of mud volcanoes most probably interacts with hydrocarbon phases by processes such as gas dissolution, oil “water washing” bringing microorganisms caused intensive bacterial oxidation processes. Microbial degradation processes are more typical for highly fractured geological regions with high water permeability and presence of shallower oil-and-gas fields (in particular, Shamakha-Gobustan oil-and-gas bearing area).
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Comparative Organic Geochemical Characterization of Paleogene-Neogene Sediments in the South Caspian Basin
By M.F. TagiyevIn the South Caspian basin source rock studies based on Rock-Eval pyrolysis were carried out using three different types of rock material: cores from wells, outcrop samples and mud volcanic ejectas. Three stratigraphic intervals were considered: Oligocene-Lower Miocene Maykop Series, Middle-Upper Miocene and Lower Pliocene Productive Series. For Oligocene-Lower Miocene interval most numerous are outcrop analyses, with their geochemical characteristic being altered by weathering. For two other intervals the bulk of samples is core material. Core samples and ejectas are shown to be less effected by hypergene factors. Estimates of sediments organic content and their hydrocarbon generative potential depends upon sample size and display appreciable variation between wells, outcrops and mud volcanoes. In the Lower Pliocene samples epigenetic hydrocarbons have been found to make up significant proportion of total organic content of sediments, thus pointing to subvertical migration from depths of oil generation.
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Mixing and Diffusion of Biogenic Gas in the South Caspian Basin
More LessUsing the projections and suggested "pure" biogenic isotope value estimates of biogenic gas contributions were made for all samples which lacked a clear indication of microbial alteration.
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A New AMS 14C-dated Holocene Caspian Sea-level Curve
New data on Holocene Caspian sea level change are presented from the Volga delta in Russia, the Kura in Azerbaijan and the Turali barrier coast in Dagestan. The oldest AMS 14C data from several drillings in the Volga delta suggest a lowstand around 8000 BP, in harmony with earlier data obtained by conventional methods. Volga delta data suggest a continuously rising sea level between 5000 and 3000 BP until a highstand is reached at -25 m around 2600 BP, as documented in the Dagestan barrier coast corresponding with the well-known cool and humid period at the start of the Subatlanticum. The historically well-known mediaeval Derbent regression down to -34 m, and possibly even -45 m, is recorded in the deeper parts of the offshore Kura delta in Azerbaijan, coinciding with the Warm Mediaeval Period, and a second highstand in the Little Ice Age is documented in the outermost barrier in Dagestan. Our data corroborate a correlation of Caspian Sea Level with changes in solar activity.
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Regional Controls on Lacustrine Sandstone Reservoirs – The Pliocene of the South Caspian Basin
Authors N. Abdullayev, G. Riley, A. Bowman, G. Riley and A. BowmanThe Pliocene Productive Series (PS) of the South Caspian Basin (SCB) records a major lowstand relative to pre-existing Miocene and subsequent Pleistocene and Holocene shelf margins. The PS records greater than 2 million years of relatively continuous deposition of lacustrine sediments in the Caspian.
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Results of a Palynological Study of Shallow Boreholes from the Holocene of the Volga Delta, Russia
Authors K. Richards, N. Bolikhovskaya and N. BolikhovskayaThis study describes the results of palynological analysis from shallow cores collected from the Volga Delta. The sediments studied are of Holocene to Late Pleistocene age. The results can be compared to the Pliocene "paleo"-Volga, the Productive Series of Azerbaijan. Late Pleistocene to Early Holocene deposits consist of reddish-brown clays. Channel deposits contain frequent Mesozoic reworking. The pollen and spores give an indication of vegetation change on land, particularly in relation to climate. Caspian dinocysts are restricted to low salinity waters, (within the range of 5 to 12 ‰). Salix (willow)pollen gives a proxy of channel migration over time. Tilia (lime) pollen is locally frequent and represents a climatic optimum. Aquatic pollen indicates the relative extent of reedbeds and open water habitats. The first phase of delta deposition occurred after c.7000 BP and is marked by a “flood” of brackish dinocysts, overlain by an interval with increased freshwater components. The second occurs after c.3000 BP and consists of several transgressive episodes, coinciding with increased Pinus (pine) pollen from the hinterland, and also by increased Mesozoic reworking. This suggests that the outflow of freshwater from the Volga River contributes to Caspian Sea level rise.
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Late Eocene - Early Oligocene Litho-biostratigraphy of the Caspian and Black Sea Regions
Authors S.A. Shikhlinsky, Z. Bati and Z. BatiUpper Cretaceous and Lower Oligocene deposits around the Caspian and Black Sea regions contain hydrocarbon resources. Therefore, the study of the litho-biostratigraphy of the marine and terrestrial terrigenous to carbonaceous Eocene-Oligocene deposits of the area has a great interest. These deposits contain abundant fossil organic remains of various provenance and climate zones which allows to understand the evolution of faunal and floral assemblages of Upper Eocene-Oligocene on the background of global climate and environmental changes. Most widespread faunal and floral taxa belong to planktic and benthic foraminifera, nannoplankton, ostracoda, fish as well as palynomorph (spore, pollen and dinoflagellate) associations. Whereas radiolaria are encountered rarely and chara are met recurrently. Among these planktic and benthic foraminifera, ostracoda and palynomorph associations are very crucial for delineation and correlation of Upper Eocene deposits in which planktic foraminifera and dinoflagellate zones were defined properly. Overlying Oligocene deposits is known as Maykop Suite where there is poor benthic foraminiferal association, very rare plankton species and lack of some species was coursed by hostile paleo-environment. Vertical distribution of benthic foraminifera made it possible to define only local foraminiferal biozones. As far as the palynological data is considered, Lower Oligocene deposits are characterized by abundant and diverse dinoflagellate taxa. Whereas, Upper Oligocene deposits are is rich in terrestrial palynomorphs.
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Environmental Control on Source Rocks and Reservoirs Accumulation in the Jurassic Series of the MCB South-western Flank
Complex geological-geophysical investigations in onshore and offshore parts of the Middle Caspian basin allow to reconstruct depositional setting of Jurassic complex as well as evaluate its HC generation potential and reservoir properties, which are strongly dependant on depositional environment.
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Multi-component Analysis of Radio Wave Background of the Earth Reveals Hydrocarbon Accumulations in the Black Sea Basin
Authors Yu.A. Bogdanov, I.B. Burkinsky, V.P. Kobolev, O.M. Rusakov, I.B. Burkinsky, V.P. Kobolev and O.M. RusakovA source for hydrocarbon generation includes different phase changes whose effects result in radiating natural electromagnetic impulses of wide range frequencies (Sokolov, 1996; Bogdanov et al., 2001; Ablya et al., 2006). In contrast to a convenient technique, the multi-compositional analysis of radio wave background of the Earth (MARBE), for the first time, deals with signals from non-linear processes of this radiating which are registered with the innovative equipment “TEZEY” (Alyoshin and Bogdanov, 2004). A mathematical processing incorporates wavelet transformation, wavelet image of an electromagnetic signal, singular spectral analysis and pattern recognition method. The MARBE method has been successfully tested during searching for oil - and gas - bearing features at sea and land in Ukraine, Kazakhstan, Azerbaijan, Turkmenistan and Peru in 1993-2007. Its efficiency is for once illustrated by a case study of hydrocarbon accumulations on the NW shelf of the Black Sea.
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Estimation the Influence of the Strength State of the Real Medium on the Elastic Parameters of the Sedimentary Rocks
Authors K.B. Aghaev, H.H. Guliyev and H.H. GuliyevAccording to the materials of the field geophysical surveys there are given the results of evaluation, the influence of the variation of the strength state of the real medium on the values of the elastic parameters of the rocks within the limits of nonclassic linearized theory of deformations.
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An Integral Geological and Geophysical Modeling Gives an Impetus to Expand Exploration Activity Offshore Ukraine
Authors O.P. Petrovskyy, N.S. Ganzhenko, T.O. Fedchenko, B.B. Gablevskyy, G.O. Zhuchenko, V.V. Gladun, P.M. Chepil, P.M. Melnichuk, O.A. Kitchka, O.G. Tsiokha, S.V. Koltsov, N.S. Ganzhenko, T.O. Fedchenko, B.B. Gablevskyy, G.O. Zhuchenko, V.V. Gladun, P.M. Chepil, P.M. Melnichuk, O.A. Kitchka, O.G. Tsiokha and S.V. KoltsovThis approach of integral geological and geophysical modeling has been applied to study exploration zones and local prospects in the western (Carpathians) and eastern (Dnieper-Donets basin) petroleum-prone provinces. As known oil-and-gas prospective areas are not confined only to onshore Ukraine and spread out to shelfal and deepwater parts of the Black Sea mega-basin where several gas and gas condensate fields are found to this date. Recently this list was successfully updated with proving of commercial oil productivity for Subbotin field.
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How to Launch a Seismic 3D Land-marine Transition Survey - An Example from the Nile Delta, Egypt
By F. SteinhoffSeismic imaging is a key to understand the geological structure of the earth. Transition zone seismic is always a difficult task, since data quality is not easy to keep up with. This talk deals with the difficulties of planning and execution of a 3D transition survey with two unequal contractors in a dense populated area and heavily used fishing grounds to peak out seismic quality and enable for a new geological concept of the reservoir. It can be shown that careful planning and execution of a 3D transition survey will eliminate many of the pitfalls during interpretation and analysis of the seismic properties such as AVA analysis and inversion.
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On the Use of Geothermal Data to Study Paleoclimate in Azerbaijan
More LessThe geothermal data used for this study consist of high quality borehole temperature-depth profiles at Kura depression in Azerbaijan. Three boreholes located near Sheki (Gamigaya 14), Mingecevir (Garaja 16) and Dalimammadli (Dalimammadli 201) were logged in 1979 /1980. Borehole temperatures were measured more than one year after drilling by thermistor probes of 0.001 degree Celsius sensitivity that were calibrated against a high accuracy (0.01 degree) mercury thermometer. The general calibration curve fitted to the data suggests the temperature accuracy of 0.03 degree. The time constant for the probe is 1 min in water. Measurements were done by lowering the probe slowly to the desired depth and registering temperature after 2-5 minute waiting time. The principal meteorological data used to infer climate change on land are mean annual surface air temperatures (SAT). These measurements are taken approximately 1.5 m above the ground surface. A ground surface temperature history is selected that best explains the observed subsurface perturbation. Alternatively, the surface temperature history can be inferred directly by borehole temperature data inversion. Inversions of temperature data for Garaja-16 and Gamigaya 14 boreholes show the climate warming on 1-2 degree in the past two centuries.
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Application of Methods PNNL and NML for Learning Benches-reservoirs in Oil and Gas Fields of Azerbaijan
Authors A. Ibadov, T.D. Hasanov, D.M. Sadigov, A.K. Alasgarov, F.I. Ibadov, A. Ibadov, T.D. Hasanov, D.M. Sadigov and F.I. IbadovPulsed neutron method of investigations in section of cased wells and a method of nuclear magnetic logging on a method of a free precession in the open trunk of wells are perspective methods at problem solving emanating benches of oil and gas, qualitative and their quantitative determination of reservoir properties. For last years with wide application of the new method of application of PNNL on various fields of Azerbaijan have been investigated more than 100 wells at mineralizing local waters from 10 up to 70 g/l and porosity of benches 10-25 % with performance up to 85 %.Studies of NML with application of device designed in Geophysics ETI and stations KEDR are held to last years on a line of Apsheron fields and adjoining water area.Joint interpretation of NML data and complex GRW allows to partition potentially productive and barren benches, to determine FFİ/Кpor as a measure of fluid potentially recovered from a bench and also permeability of bench Kper under approved formula Coates. Results of NML and other methods GRW are entered into a computer database in which one they are exposed to statistical treating and analysis.
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Major Trends of Environmental Policy of SOCAR
Authors A. Salmanov, F.A. Jafarov and F.A. JafarovAzerbaijan’s oil industry has more than a century of development history.It is commonly known that while production, collection and transportation of oil, the surrounding environment are penetrated by the stratal water (as well as oil), bypass gas and by most chemical agents which are used while drilling and intensification of hydrocarbons recovery.
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Practical Capabilities of Nuclear Physics Spectrometry for Solving Problems in Exploration and Production Geophysics
The most widely used problem solved by NPM is complex reservoir rocks’ current saturation evaluation with separate evaluation of oil, gas, gas condensate and different salinity waters in the fluid. Nowadays this problem is solved on a large scale (dozens of fields) in the real production mode with a satisfactory reliability. For example, more than 2000 wells were studied only in Samotlor field from 2000. NPM are conducted in practically each well in the course of planned repair. Our experience in NPM application (since 1997) demonstrated its high information value on geologic structures in Russian and other former Soviet Union hydrocarbon fields, in various (often very complicated) geologic and technical conditions. The capabilities of the set of methods substantially strengthen well logging positions and spread the range of the produc-tion and exploration geophysics problems solved. These capabilities are provided with corre-sponding methodology and practically tested in the course of solving the problems listed be-low.
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