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4th EAGE St.Petersburg International Conference and Exhibition on Geosciences - New Discoveries through Integration of Geosciences
- Conference date: 05 Apr 2010 - 08 Apr 2010
- Location: Saint Petersburg, Russia
- ISBN: 978-90-73781-79-5
- Published: 04 May 2010
1 - 50 of 210 results
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Experience of Regional Geological Modeling by the Example of Yamal–Kara Region
Authors Y.P. Ampilov, A.A. Akhapkin, Y.I. Stein, B.V. Monastirev and I.I. NesterovBy authors of this thesis were contemplated methodical and technological problems arising in the process of the analysis of the diverse geology-geophysical information which is used at construction of geological models of large regions, and possible ways of overcoming of these problems
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Assessment of Undiscovered Petroleum Resources of the Yenisey–katanga Basin
Authors T.R. Klett and J.K. PitmanThe petroleum resource assessment of the Yenisey-Khatanga Basin exemplifies the United States Geological Survey assessment process for basins in the Arctic. This assessment of crude oil, natural gas, and natural gas liquids (collectively referred to as petroleum) resources is one of several conducted by the U.S. Geological Survey Circum-Arctic Oil and Gas Resource Appraisal program. Using a geology-based methodology, the USGS estimates the mean undiscovered, conventional petroleum resources in the province to be approximately 24 billion barrels of oil equivalent of crude oil, natural gas, and natural gas liquids.
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Geology and Petroleum Potential of the Upper Proterozoic Basins of Northern Siberian Craton
Authors S.V. Frolov, K.A. Sitar, Y.I. Galushkin and G.G. AkhmanovIn spite of insufficient geological and geophysical knowledge of upper Proterozoic formations in the north of Siberian platform there were several large sedimentary paleobasins. Part of them (for example, Anabar-Kureika and Udza basins) were intracratonic, another part of basins (for example, Turukhansk) were formed on the ancient continental margin. The data analysis of seismic surveys allows to suppose that these basins were the part of similar basins of central platform areas. There are several Riphean source rocks at the different stratigraphic levels. Meanwhile the Lower-Middle source rocks have realized of their hydrocarbon potential in quite a number of cases at the end of Riphean. These hydrocarbon accumulations most probably were destroyed during Baikalian tectonic processes. Maximum of Upper Riphean source rocks hydrocarbon generation was in Palaeozoic. It is the rocks which contribute to formation of oil-and-gas accumulation well preserved up to the present moment. The most intensive Vendian sedimentation occurred in the central part of Kureika syneclise area. Discovery hydrocarbon potential first of all refers to sides of syneclise near the slopes of Anabar and Baikit anteclises. We assume that Lower Vendian deltaic and coastal marine sandy bodies are present within these areas
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Sequence Stratigraphy of the Lower Cretaceous Deposits of the Chekurovka Area (NE Siberia, Lena R.)–Preliminary Results
Authors V.B. Ershova, J.M. Holbrook, A.K. Khudoley and A.V. ProkopievThis study specifically targets on two sections of Lower Cretaceous rocks located on the Chekurovka Cape (key section) and Chucha Cape. We documented the fluvial section in terms of sequences, consisted of low-accommodation and high-accommodation system tracts, where low-accommodation system tract is characterized by amalgamated channel belts and high-accommodation system tract is characterized by channel belts dispersed within fine-grained floodplain deposits. We identified four sequences in the Chekurovka Cape the Lower Cretaceous deposits. Each of the four sequences identified within the Chekurovka section was also identified within the Chucha Cape section. Although thickness of the individual sequences varies, all sequences with high and lower accommodation systems tracts are recognized and correlated between the two sections. This implies that the four underlying sequence boundaries can be regionally correlated within this foreland basin and likely extend beyond the boundaries or our study area as well. Variability in the available fluvial accommodation space probably was connected with variation of basin’s subsidence rate.
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Lateral Structural Segmentation of the Uralian Foreland Thrust Belt
Authors K. Sobornov BV, N. Malyshev, N. Nikonov, V. Martirosyan and K. Alzhanov BVThe subsurface data from different parts of the foreland thrust belt reveal significant along-strike structural changes. The four principal structural segments of the Uralian thrust belt are, from north to south: the Novaya Zemlya, Pechora, Volga-Ural and Precaspian segments. They broadly correlate with the heterogeneous basement domains flanking the Uralian suture on the west and corresponding variations in stratigraphic composition of the foreland subbasins. Another important factor controlling the changes is the regional geodynamic setting, particularly the one taking place in the late Permian times during the main phase of the Uralian orogeny (Sobornov and Yakubchuk, 2006). The observed structural changes reflect geometries of collision boundaries and orientations of compressional and strike-slip movements.
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Unravelling Hydrocarbon Migration and Entrapment in the Western Siberia Basin using Advanced Petroleum System Modeling
Authors M. Saint-Germes, J. Laigle, I. Goncharov, N. Oblasov, V. Samoilenko and F. LorantThe problem of the maintenance of the production level, entailing the industrial development of new reservoir systems is vital in Western Siberia (Russia). Such targeted systems include the deep Neocomian deposits (Achimov Fm) and Late/Middle Jurassic reservoirs. Hydrocarbon fields occur in Neocomian sandstone lenses, disseminated within silt and marine shale deposits. These reservoirs, stratigraphically associated to a large and complex system of clinoforms, correspond to both deep-water sand facies of the Achimov Fm at the base of the slope, and deltaic and shoreface sandstones interbedded with shales at the top. They contain hydrocarbons originating from the Bazhenov Fm (20-70 meters), considered as the major source rock in this basin. Late Jurassic siliceous layers underneath the Bazhenov black shale constitute another reservoir system of interest. Accumulations were discovered in Late/Middle Jurassic sandy reservoirs, but their oil and gas habitats remain undervalued to date. These reservoirs, affected by fracturing and deformation, are characterized by a series of anticlines and synclines structures separated by sub-vertical faults.
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3D Seismic Exploration for Oil and Gas Bearing Pinnacle Reefs inside Kamsko-kinel Throughs System–Volgo–Ural Province
Authors Y.I. Nikitin, S.V. Ostapenko and N.A. BachurinThe Upper Famenian – Lower Visean Kamsko-Kinel Troughs System control numerous oil fields within the Volga-Urals province.Due to high degree of exploration mature these throughs are considered to be of little promise for prospecting additional remarkable oil reserves. By modern 3D seismic surveys Upper Devonian pinnacle reefs were located along inner part of the Mukhanovo-Erokhov through southern margin. Reef small sizes (0.2-0.3 km2) and considerable depth occurence (more then 3.0 km) were the causesor their missing by seismic 2D before. Upper Devonian basinal isolated reefs are significant exploration play for oil and gas within Kamsko-Kinel Throughs System. 3D seismic is an exclusive technique for effective mapping of small-sized and deep-seated oil&gas bearing isolated reefs. Tectonic swells are foremost areas for prospect reefs groops
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Pre-caspian Paleozoic Deposits Modern Structure Formation Condition
Authors O.S. Obryadchikov and K.M. TaskinbayevAnnotation. Seismic works and deep boring materials analysis points out penecontemporaneous formation of Astrakhan-Aktubinsk uplift zones (AAUZ) and absence of cuttings at the culms of atoll like carbon-bearing solid masses as of Tengiz type. Soline thikness accumulation of Kungurian age tookplace at deep-water basin (the depth in the central areas of Pre-Caspian lacune exceeds 1,5 km). Seismic works materials interpretation within AAUZ limits assumes existing of trottoir s at docungur cuttings. Coincidence in plane of these “ reefs” is seen and salt-dome structure s that contradicts peculiarities of such formations
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Western Laptev Sea Region Framework–Structural Style and Timing of Deformation
Authors V.E. Verzhbitsky and A.K. KhudoleyThe Laptev Sea region is one of the remote and geologically complex areas of Russian Eastern Arctic. According to the existing seismic data, a number of large offshore sedimentary basins with significant proposed hydrocarbon potential, were revealed on its shelf. No offshore wells were drilled there so far, thus all the information on the regional geology, is based on the very limited amount of marine seismic profiles and our knowledge on adjoining near-coastal areas. This study is based on the series of field works 2008-2009, carried out as a part of TGS-NOPEC Geophysical Company / St Petersburg State University joint project on Geology and Hydrocarbon systems of Northern Siberia. The field observations were done in the Laptev Sea framework, including Taimyr, Verkhoyansk and Olenek fold belts, Siberian craton, Enisey-Khatanga and Anabar-Lena depressions. Here we present some results of structural investigations of the Paleozoic-Mesozoic sedimentary complexes, exposed on Southeastern Taimyr, Bolshoy Begichev Island and Paksa Peninsula/Anabar River mouth. It is shown, that the final stage of compressional deformation in the Western Laptev Sea Region corresponds to Late Kimmerian and so is roughly synchronous with those on the rest of Eastern Arctic area, including New Siberian Islands, Chukotka and Brooks Range.
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Geologic Interpretation of Basic Seismic-acoustic Attributes for Developing a Geodynamic Model of Chukot Earth’s Crust
Authors E.Y. Goshco, A.V. Migursky and A.S. SalnikovSeismic-acoustic inversion of the CDP section of the 2-DV-A reference profile running from the Pevek (Chaun Bay) to the Valunistoye (Central Chukot) has resulted in basic dynamic and geometrical characteristics such as an average reflector dip, and integral reflector energy. It is established that the behavior of a crust-mantle layer «Moho» is quite accurately observed on the seismic acoustic section. The integral energy section appears to be useful for identifying crustal blocks. The analysis of reflector dips on the 2-DV-A profile has shown that in its northwestern part (0–200 km) in the crystalline crust the inclination of reflections prevails obviously to the southeast. In the interval of 200-205 km in the crystalline crust and uppermost mantle, the vertical column of reflections with the northwestern inclination serving as a sharp boundary between large blocks of the Chukchi microcontinent has shown itself clearly. From 390 to 520 km the northwestern reflector inclinations are dominant in the crystalline crust, which corresponds to the movement of microblocks of the Koryak accretionary belt. The use of basic seismic-acoustic attributes for geologic interpretation has supported the validity of the developed deep geologic-tectonic model of the earth’s crust of the northern and central Chukchi microcontinent.
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Geologies Items of Detection Perspective Squares of Indolo–Kuban Basin and there Relation with Oil and Gas Saturation
Authors A.A. Bolshakov and A.A. NikitinThe basic geological criteria of the regional forecast of hydrocarbon saturation of Indolo-Kuban sedimentary basis were considered. These geological criteria allow to allocate oil-and-gas perspective areas the Indolo-Kuban sedimentary basin. Oil-and-gas field, which were opened in the last decade, confirm hydrocarbon saturation this region
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Our Knowledge of France’s Sedimentary Basins Benefits from an Exceptional Update due to a Proliferation of Deep Basin de
Authors A. Bialkowski, S. Gabalda, E. Lasseur, C. Rigollet, O. Serrano and C. TruffertThe principal sedimentary basins of France result from a succession and/or combination of extensional or compressive and thermal mechanical evolution controls during the Alpine Cycle. The sediments filling these basins can be subdivided into second-order sequences recording the major geodynamic events that have marked the Mesozoic and Cenozoic geological history of Western Europe. The Mesozoic and Cenozoic sedimentary basins have been worked since antiquity for their multiple resources and have been the subject of outstanding geological syntheses since the 18th century. At the beginning of the 20th century, the geological information extracted the first deep water wells, combined with the cartographic data, gave us a three-dimensional picture of the basins. Thereafter, the proliferation of oil-exploration, gas-storage and geothermal-energy projects provided, in particular, 350,000 km of seismic lines and 6000 deep boreholes. France’s sedimentary basins are today basins for which we have a large amount of diversified data. They thus provide excellent playing fields for developing modern methodologies for 3D reconstruction of the deep geology by virtue of major societal projects and extensive scientific debate on the sedimentary recording of geodynamic events.
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Deep Geologo-geophysical Criteria of the Regional and Local Hydrocarbon Prognosis
Authors A. A. Nikitin and D.P. ZemtsovaThere are considered deep geological and geophysical criteria for hydrocarbon prognosis on the base of new oil and gas generation concepts (polygenic genesis, geosoliton emission, hidritic Earth, mantle structures) and are defined integrated geophysical tehnologies for their determination.
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Irregularity of Energy Resources Distribution
Authors Y.K. Burlin and A.V. StoupakovaGlobal resources of hydrocarbons and other (coal, woods, water, etc.) energy sources are distributed irregularly. This depends upon geotectonic position of the region, historical and today’s climatic conditions, and upon some other reasons. Main resources are located in the large troughs of the Earth crust (sedimentary basins) with thick layer of deposits. Today most famous of them are Persian Gulf with vast adjacent territories, Near-Caspian Depression with the northern part of the Caspian Sea, Barents Sea, Western Siberia (central and northern regions) and adjacent offshore area of the Kara Sea. Mexican Gulf with its not yet fully explored resources is also included into this largest category. Further investigations will lead to discoveries of similar large basins in the Arctic too
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Recognition of Late Aptian Relative Sea Level Drop in West Siberia Basin
Authors A.L. Medvedev, C.R. Handford, A.Y. Lopatin, Y.V. Masalkin and M.N. NikolaevLate Aptian relative sea level 100-120m drop and associated regional unconformity (sequence boundary 1) identified in Western Siberia. Incised Valley System of Krasnoleninskiy Arch is an indicator of this drop.
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Relative Sea–level Changes in Cratonic Basins–Tectonics or Eustasy
More LessLarge changes of the depth of water of a third order in cratonic basins, up to 100-200 m during 1-3 Ma, are commonly supposed to be of a eustatic origin. Continuous deposition took place at a depth of ≤ 10-20 m in East Siberia in the Ordovician and Silurian, East Baltic in the Cambrian and Ordovician, and in the East European Platform in the Pennsylvanian and Early Permian. Modelling of changes in the depth of water in these regions under sea-level fluctuations of a third order has shown that over the predominant part of the above epochs such fluctuations did not exceed 20-30 m. Under such circumstances, large-scale regressions and transgressions, 1-3 Ma long, in cratonic basins should be attributed to rapid vertical crustal movements. For example, the crustal uplift of ~ 200 m followed by the subsidence to the initial level occurred on the shelf in the western part of the East European Platform in the earliest Pennsylvanian. Numerous stratigraphic traps were formed due to regressions and transgressions of a third order. In each hydrocarbon basin, their prospecting requires the studies of time and space distribution of rapid vertical crustal movements in the basin and in the adjacent areas.
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Sequence-stratigraphy in Studying the Structure and Petroleum Potential of a Sedimentary Cover
More LessThe report is prepared on the example of the sedimentary basins of the Pacific margin Russian sector; the most part of them is located in the offshore (Tatar strait, the Sea of Okhotsk, the Bering Sea). Factual material is represented by seismic survey and drilling data and also the data of observations by the sections of a sedimentary cover in outcrops. The basins are filled in Cenozoic deposits; they are characterized by the high velocity of sedimentation and a dislocated sedimentary cover. It determined the specificity of a sequence analysis. Sedimentary covers are divided by unconformity surfaces into structural-stratigraphic complexes. The last correspond to transgressive-regressive cycles of duration of 5-25 million years; by a volume they are close to supercycles (cycles of 2-nd order) of a sequence-stratigraphical scale. Sequences (cycles of 3-rd order) are determined only in the separate parts of the section; but their mapping is decisive for paleogeographical reconstructions, reconstituting the sedimentation structure of a sedimentary cover and the arrangement of hydrocarbon systems.
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Paleozoic Carbonate Platform in the Barents Sea East
Authors M.I. Leonchik and B.V. SeninWave field anomalies detected in seismic lines in Upper Devonian – Lower Permian terrigenous – carbonate deposits of the Barents Sea are typical of marginal reefs and carbonate scarps. Seismic data analysis allowed us to outline possible areas of carbonate scarps development. There are mainly confined to steps and terraces of the ancient continental shelf and fringe deepwater non-compensated basins of the East Barents Trough and adjacent depressions. Elaborated regional paleo-environmental map for Late Devonian – Early Carboniferous of the Barents Sea Area was constructed on the base of seismic interpretation data and the results of the Sea bottom and onshore area geological and geophysical surveys. The geologic – geophysical data comparison revealed a noticeable resemblance of structural – geological and sedimentary characteristics of Upper Devonian – Lower Permian basins in the East Barents Trough and PriCaspian Depression. Thus there could be condition in the East Barents Sea Trough and its borders favorable for development of both carbonate – clayey oil source rocks and oil promising sedimentary traps in the form of reefs, confined to marginal scarps of carbonate platform and to the inner carbonate shelf.
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Paleo-environment and Regional Oil Prospectivity of Triassic Deposits in the Barents Sea
Authors B.V. Senin and M.I. Leonchikarly, Middle and Late Triassic depositions are reconstructed and the areas of the possible Triassic source rock development are mapped. It is marked that these areas had been forming during the entire Triassic in the deepest parts of the East Barents Trough where its sections is most complete. New zones of litological and structure - litological traps development within south-western and central part of the South Barents basin are outlined. The research results indicate rather high probability of new oil discoveries in Triassic deposits of the Barents Sea, particularly within board and uplifted zones of deep trough. Oil pool may be confined to sandy, siltstone – sandy or sandy – pebble reservoirs in litological and structure - litological traps.
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Geology and Total Petroleum System of the East Barents Basin Province
Authors J.K. Pitman and T.R. KlettThe petroleum resource assessment of the East Barents Basin Province, recently completed by the U.S. Geological Survey, is based on the Total Petroleum System concept, which includes knowledge of source, reservoir, and seal rocks, and timing of petroleum generation, migration, and accumulation. Using this approach, the mean undiscovered, conventional, petroleum resource in the province is estimated to be approximately 62 billion barrels of oil equivalent of crude oil, natural gas, and natural gas liquids.
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Deep Structure of the North Kara Terrane Based on Integrated Interpretation of Data along Regional Lines 3–AR and 4–AR
Authors N.M Ivanova, I.V. Belyaev, T.S. Sakulina and Y.V. RoslovThe considered territory covers the northern part of the Kara Shelf and an adjacent onshore of the Severnaya Zemlya Archipelago and Taimyr Peninsula. Geophysical investigations (seismic wide-angle reflection/refraction profiling - WARRP, multichannel seismic – MCS, and gravity/magnetic measurements) along regional lines 3-AR and 4-AR allow to connect geological data of the Island Pioneer (Severnaya Zemlya Archipelago) and northern part of the Taimyr Peninsula, and to provide new data concerning the deep structure of the North-Kara Terrane (plate). The purpose of this article is to illustrate new results about the deep geological structures of the North Kara Terrane. The full section of the Earth’s crust with basic crust boundaries and intra-sedimentary horizons was first studied in the North-Kara Terrane. The sedimentary cover is composed of the thick Vendian, and Cambrian terrigenous sediments, mainly carbonate rocks of the Lower and Middle Paleozoic, terrigenous-carbonate deposits of the Upper Paleozoic, and thin terrigenous Mesozoic-Cenozoic sediments. The total thickness of the Paleozoic sediments exceeds the thickness of the overlying Mesozoic sediments to a great extent. New information about deep Paleozoic complexes of sedimentary cover is important for evaluation of the hydrocarbon potential of this northern region.
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The Geological Structure and Formation of Hydrocarbon Systems in Sedimentary Basins of Russia's Shelf of the Chukchi Sea
More LessFollowing from the integrated analysis of geological and geophysical, mainly, seismic data, the paper presents a new conception on sedimentary cover stratification in the southern and northern parts of the Chukchi Sea offshore Russia, tectonics of the North- and South-Chukchi basins and the overview of potential hydrocarbon accumulations. Both similarities and differences with the American part were demonstrated in the sedimentary cover in the Northern Russian sector of the Chukchi Sea. In the Russian part, foredeep buildups are degraded due to more extended erosion and development of the series of ledges before the Wrangel-Herald front. Also, the sub-latitudinal marginal uplift is less expressed there (analog of Barrow swell, Alaska). In the South-Chukchi basin in the basal part of the sedimentary cover, transtension structures are widely developed along with rift-related structures. The strike-slip movements are displayed in the Oligocene - Early Miocene section, being well-correlated with the same in other sedimentary basins of the Eastern Arctic. The highest prospective of hydrocarbon discoveries is referred to the North-Chukchi basin.
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Comparative Analysis of North–Chukchi Basin Oil Systems
Authors E.V. Gretskaya, I.E. Rybak-Franko and A.V. SavitskiyThere are three speculative petroleum systems in the structure of North-Chukchi sedimentary basin: Ellsmerian, Rift and Brookian, which are confined to regional seismic-stratigraphic complexes. The rock elements of the petroleum systems are predicted on basis of seismic facies analysis. The study of North-Chukchi basin petroleum systems allowed us to define position of the different-aged pods of active source rock and calculate the amount of generated hydrocarbon. So, in the southern slope of the basin the main HC generation is provided by Ellsmerian system pod of active source rock (260-0 million years). In the central part of the basin there is the pod of active source rock of Brookian system (65-0 million years) with 3,5 km oil generation zone. Partial combination of two these systems pods of active source rock significantly increases perspectives of oil-and-gas content of the southern basin slope. HC potential of the North-Chukchi basin approach to 160,3 billion tons, where the contribution of Ellsmerian system is 43,0%, Brookian system is 34,0%, Rift system is 23,0%.
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Methanogenic biodegradation of petroleum in the Western Siberia basin and its significance for formation of giant gas pools
By A.V. MilkovThis presentation demonstrates geological and geochemical evidence suggesting that a significant portion of dry gases in giant gas pools in Western Siberia originated during methanogenic biodegradation of petroleum. Most important geological evidence include common association of dry gases with biodegraded oil legs or underlying biodegraded oil and condensate accumulations. Most important geochemical evidence include 13C-enriched CO2 in pools with biodegraded oil and distinctive hydrocarbon molecular and isotopic compositions of most gases in Cenomanian pools suggesting that they represent mixtures of biodegraded thermogenic gases and secondary microbial methane. This Western Siberia study and other recently recognized worldwide occurrences of methane from biodegraded petroleum suggest that secondary methanogenesis is a highly important pathway of natural gas generation.
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Interpritation of Light HC Distribution in the Bottom Sediment of Black Sea Regarding to Oil and Gas Prospects
Authors M.V. Kruglyakova, E.A. Lavrenova and R.P. KruglyakovaFor the first time result of long term (1990 – 2008 yy) geochemical surveys have been analyzed. Background levels and anomalies are estimated. Regional spatial HC distribution maps have been prepared. Showing great promise of HC areas prospecting have been determined
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Kujumbinsko–Jurubcheno–Tokhomskiy Hydrocarbon Accumulation Area of the East Siberia
Authors V.V. Kharakhinov, S.I. Shlenkin, V.A. Zereninov and O.N. KulishkinaThe results of the Kujumbinsko-Jurubcheno-Tokhomsky hydrocarbon accumulative area have been reported. This area is represented, mainly, by the Riphean huge fractured massif within the largest hydrocarbon accumulation of the East Siberia. The structural and hydrocarbon accumulative features are identified by the fluidal – dinamic process into the Earths crust and the upper mantle. The main principles of the abyssal – filtration model on the hydrocarbon generation and accumulation in the old and ancient strata of the Siberian platform have been identified. The results of the petroleum geologic researches of the East Siberia based on this model are indicated
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Lithofacies Model of Riphean Formation of Yurubcheno–Tochomskoe Field
More LessCarbonate oil reservoirs have complex structure and vertical and lateral variations of properties. Carbonate rocks are highly transformed by secondary processes, which may entirely change the structure of rocks and the cavity geometry. A geological model of carbonate oil reservoir must take into consideration all of the following factors: the detailed lithologic analysis, rock characteristics, cavities structure and reservoir distribution in section and by area. This article reveals how the complex studying of material (core samples, thin sections analysis) may help to predict the productivity of carbonate reservoir, for example Yurubcheno-Takhomskoe oil field, esp. when geophysical measurements, e.g. seismic or logging, are non-informative for oil content estimation. Different type of dolomite were defined. Intraclast dolomite is the main type of dolomite rocks with additional volume. Well tests confirm that assumption. Intraclast dolomite embeds in the top of sedimentology cycle. As the result of the investigation the productive zones were delineated
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New Directions of Prospecting for Oil and Gas in the Predpatom Regional Trough–The Siberian Platform
More LessThe analogy in a texture of fold-thrust structures of the Predpatom regional trough (the Siberian Platform) with Asmara oil traps in Persian Gulf is marked. The high-priority zone of prospecting works around the undercurrent of the Peleduy River is allocated
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New Approach for Constructing 3D Structural Models in the Complicated Tectonic Settings of Pre Caucasian Trough Belts
More LessThe article offers a new approach of complex 3D structural models constructing, which allows decrease structural risks and uncertainties during both exploration and prospecting. Basic principle of given technical approach is iterative workflow of structural validating geological hypotheses as regional conceptual tectonic and geodynamic models as local hydrocarbon reservoirs and individual structural blocks. Methodology has been successfully tested on complicated tectonic settings of the West Kubanian and Tuapsian trough fold belts.
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Quantitative Analysis of Ultrasonic Wave Radiation on Reversibility and Kinetics of Asphaltene Flocculation
Authors S. M. R. Mousavi, I. Najafi, M.H. Ghazanfari, R. Kharrat and C. GhotbiRecently, it was found that ultrasonic wave technology can be used as a method for asphaltene deposits removal from the near wellbore region. However, ultrasounds can affect asphaltene resolution.In this work, asphaltene resolution in several crude oil samples exposed to ultrasonic waves for different time intervals is studied by confocal microscopy. The colloidal structure of flocks is described by analysis of asphaltene particle size distribution to investigate ultrasonic application in solving asphaltene deposition problems.. The results show that for the first 90 minutes of flocculation time, the size of aggregates increases rapidly, and reaction limited aggregation model matches well with the experimental data for all samples. But, after 90 minutes, a reduction in aggregate size of sonicated samples is observed, meanwhile the aggregates size of non-sonicated oil sample increases in close agreement with the diffusion limited aggregation model. It has been found that asphaltene flocculation of sonicated samples can not obey classic DLVO theory of colloidal dispersions due to partial reversibility of flocculation. An optimum value for ultrasonic radiation time, at which the viscosity and flocculation rate of asphaltenic crude oils reduces to its minimum, is found to be close to 10 minute for Sarvak crude oil.
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Reservoir Characterization of Upper Kangan Formation in South Pars Field (Southern Persian Gulf)
More Lesswe studied the reservoir parameters of Upper Kangan formation in two wells using core data (including petrography and capillary pressure test). We used 271 and 161 plug samples for permeability, porosity and density measurement in well 1 and 2, respectively. Also we utilized HRLA (High-Resolution Laterlogy Array Tool) and DSI (Dipole Shear Sonic Imager) tools and other conventional wire lines for petrophysical evaluation. For evaluation of pore throats and their distributions and their effect on reservoir characteristics in limestone and dolomitic samples, mercury injection test was performed by Auto Pore mercury injection apparatus. Petrographic studies include definition of porosity types, microfacies, digenetic and dolomitization processes in samples. Acquired results of this study have shown that the upper Kangan indicates poor to fair reservoir quality.
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Experience of Effective Application of Transient Electromagnetic Method–TDEM–in the South Part of the Siberian Platform
Authors Y.A. Agafonov, I.V. Buddo, S.V. Kompaniets and V.V. GomulskiyNowadays transient methods of electromagnetic sounding are an integral part of the complex of land geophysical methods when studying the sedimentary cover in the south of the Siberian platform. Geological and physical prerequisites of successful application of electroprospecting methods consist of a favorable combination of section’s rocks petrophysical properties - virtually everywhere the value of geological horizons resistance depends on their reservoir properties. In this case it is possible to study reservoirs distribution zones when exploring for minerals contained in them (hydrocarbons, hydromineral materials) and forecasting of difficult conditions of deep well drilling. Electromagnetic exploration is particular important in difficult geological conditions when seismic methods do not result in reliable geological results. Modern sounding technologies, advanced processing and interpretation programs enable one to obtain the geophysical material of high quality aimed to effectively solve geological problems. In the paper examples of TEM prospecting and a technique of the prediction of abnormal reservoirs presence are provided that were performed on an area not examined by drilling
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Gas Recourses in Gas Hydrate Stability Zone on West Siberia North
Authors S.E. Agalakov and A.R. KurchikovThis work concerns studying the geologic structure of prospective interval and the thermal mode of section shallow part. Both the thermometry in wells with long idle time and measurements of temperatures obtained during testing the productive objects in the deep exploratory wells were used as the part of work for determining the section thermal mode. More than 7000 wells were used. The work resulted in the series of maps including ones on base permafrost characterizing the section shallow part, the thermal map at the depth 500 m, at the slices -1000 m and -1500 m. The derived data were used for determining temperature in the prospective reservoirs and mapping the regions with conditions favorable for gas hydrate deposit existence. The resource estimation is executed for five main prospective reservoirs: - Cenomanian deposits; - ipatovski reservoir joining ipatovskaya suite and gazsalinskaya unit of kuznetsovskaya suite which earlier considered as isolated; - russko-rechenskaya unit determined as the new prospective reservoir; - tanamski reservoir; - tibeysalinski reservoir. For each reservoir, the structure maps on their top and base and effective thickness maps were derived, the seal occurrence regions were contoured and resources were estimated.
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Oil and Gas Potential a te North o West Siberia–New Discoveries in the Messoyackha Project
Authors A.V. Zhagrin, S.I. Shlenkin, V.V. Kharakhinov, N.M. Kulishkin, O.I. Popova and D.N. KonyaevBased on seismic and drilling exploration we investigated unique oil and gas fields in the region of Central Messoyackha arch. The exploitation can start in a few years. The potential of the arch should be further increased by the exploration of the slope parts of Neocomian, Jurassic and Triassic depositions. The developed model of hydrocarbon generation and deposition is the base for further exploration
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Spectral Decomposition–A Tool for Mapping of Improved Reservoir Properties in Carbonates
Authors A. Jangirov and H. NaimSpectral Decomposition is an innovative reservoir imaging and interpretation technology originally developed and commercialized by BP. This tool enhances subtle sedimentary and tectonic features, and also helps to reduce distortions caused by tuning effect or filtration during seismic data processing. The core of this technology is conversion from time domain to frequency-phase domain. Amplitude analysis in frequency domain allows delineation of marginal variations in bed thickness, while the phase spectra indicate lateral geologic discontinuities. The main aim of this work is to find features of the internal structure of a carbonate reservoir which would help to explain the low flow rates (compared to analogue fields) from wells, which were drilled in optimal structural conditions. Using of amplitude screening and other windowed attributes couldn’t delineate clear faults pattern and its direction, showing just ambiguous zones. Spectral decomposition assisted the clarification of the faults pattern and its direction.
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Use of CSEM in Exploration in Open Acreage–A Case Study from the 20th Licensing Round–Norway
Authors S. Sperrevik, R. Davies, A. Vereshagin and B. AlaeimajolanIn the preparation for the 20th concession Round on the Norwegian Shelf, Rocksource ASA made extensive use of a fully integrated dataset including CSEM data. After conventional mapping of c. 300 leads CSEM data were collected over the 40 most promising. Advanced processing and evaluation of the CSEM data were undertaken using the proprietary software and algorithims. The leads that were interpreted to be associated with a hydrocarbon related CSEM anomaly were worked up to prospects and special G&G studies were undertaken. The results of the CSEM evaluation together with the G&G evaluation were used to de-risk and also delineate the prospectivity. Using this approach Rocksource ASA managed to identify prospects with a high commercial value and low risk and was finally awarded three licenses with several CSEM positive prospects of high commercial value. One of these licenses (PL 528) is located on the Nyk High in the Vøring Basin in the Norwegian Sea near the Luva, Haklang and Snefrid discoveries. Within this license several prospects have proven to be CSEM positive.
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Efficiency of Paleoprocessing Procedure on the Pattern of the Lugovoe Oil Field Discovery in the Low Volga Region
Authors G.N. Andreev, V.V. Prudaeva, S.V. Naumov and I.P. SlovogorodskyThe article compares results of conventional 2D seismic works interpretation procedure versus the so-called paleoprocessing on the pattern of the Lugovoe oil field at the level of the Upper Devonian and Lower Carboniferous deposits. Geological efficiency of the above-mentioned method of paleoprocessing was earlier confirmed by a number of reef traps discovered under the same seismic geological setting
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Substantiation of Oil-water Contact in Facies Changeable Upper Jurassic Deposits of the Shirotnoye Priobie Region
Authors G.R. Vasilevskaya, T.F. Sokolova and E.A. IzumovaThe Upper Jurassic deposits are oil-bearing in the study area. The issue of locating the OWC has been revealed in the process of production drilling. The current study approaches the issue of locating the OWC in the scope of the 3D integrated seismic interpretation project. Different types of geological sections for each reservoir have been determined from the well logs and detailed core descriptions. Based on the results of genetic interpretation from the paleodepths analysis, the study of geological-geophysical vertical and lateral heterogeneity of the section, the maps of seismic attributes and acoustic impedance, depositional environments have been identified. The study of reservoir characteristics from the core data enabled discrimination of various reservoir classes. Distribution of these reservoir classes is directly related to geological sections from well logs and depositional environments. The transition zone thickness for different reservoir classes and geological sections from the well log data has been estimated using phase permeability and capillary pressure curves. The oil pool, which had been regarded as one pool according to the previous model, was now divided into several pools characterized by different levels of the oil reservoir. These oil pools are associated with different types of geological sections and depositional environments.
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A Study of Upper Devonian Reefs of Timano–Pechora Province Based on a Joint Interpretation of 2D and 3D Seismic Data Ac
Authors I.V. Petrova, I.N. Kerusov and A.A. AlabushinThis presentation will review the latest results of seismic studies targeting oil and gas reservoirs in Upper Devonian reefs of Timano-Pechora Province. The results are based on a joint interpretation of 2D and 3D data in conjunction with well data. The studies were performed by PetroAliance Service Company Ltd for LUKOIL-Komi. The main goal of the studies was localization of “organogenic” objects, their structure-tectonial and lithology-facial characteristics, investigation of their litho-physical and collector properties, forecast of distribution of the aforementioned properties between wells and optimal well placement. The presentation will touch on a few particularly important problems common for such studies and will highlight methodologies of joint interpretation of 2D/3D seismic data and well data based on two individual territories. It will also highlight the importance of attribute analysis of seismic data and their inverse transform with calculation of an acoustic impedance cube. The resulting forecast is based on facial schemes constructed based on interpretation of both 2D and 3D data. 3D seismic data was used to forecast reservoir models and optimal well placement.
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Pinch–out Prediction using Seismic Facies Analysis
Authors T.S. Zhuzhel and A.A. NateganovDetermination of the most reliable formation pinch-out position is extremely important since it has influence on calculated STOIIP and development efficiency. Western-Siberian Oilfield X is under development stage at the moment. Territory is covered by 3D seismic, more then 100 wells was drilled. Productive interval overlies the basement pinching out on its highs. Furthermore, formation is affected by secondary carbonatiozation. These geological features negatively influence on determination of the pinch-out contour. Choice of techniques was done based on knowledge about formation acoustic model. Tested standard approach concerned with amplitude analysis didn’t show any positive results. Based on generation of synthetic wedge model, main seismic characteristics of pinch-out zones were identified. Then waveshape as attribute including all defined wavefield features was chosen. To provide generation of a seismic facies map it was decided to use supervised classification based on neural network technology. Seismic traces at locations of real wells were used as input data. The pinch out boundary was created by contouring of the seismic class corresponding to a well in formation absence zones. As a result, the most probable case of the formation pinch-out contour was identified. It is more optimistic related to another one created using standard amplitude methods
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Optimization of Exploration on Central Uvat Territory
Authors E.A. Marchenko and O.S. MalyginaLast 15 years the territory of Central Uvat in the south of West Siberian region is an area of exploration. 16 oilfields with 100 BBE were discovered for this period. Characterized sediments are related to Tyumen formation of Middle Jurassic. Major prospects are associated to Upper part of Tyumen Fm (units U2, U3, U4). Sedimentation processes of these sediments are of estuary-deltaic type. Key limiting feature for reserves volume is quality of reservoirs, its vertical and lateral variability in lithology, porosity, permeability and difficulties in prediction of distribution. It caused of searching of non-typical decisions for exploration process. This article demonstrates one of them. The base of it is complexation of all information about the fields, more exactly seismic, sedimentological and mineralogical core analysis, well logs. This method has become the base of successful exploration. Investigation of the territory allows to define following geological properties: abrupt facies variability which caused lenticular structure of reservoirs, lithology-tectono-structural type of traps, absence of coincidence of zone of high porosity with zones of high permeability. Moreover, investigation makes possible to explain changes in oil water contact between the blocks of fields, estimate prospects of the territory and to define the orientation of future exploration
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Geological Structure Refinement of the Veni Group of Traps Based on Integrated Interpretation of Seismic and Well Data
Authors G.G. Voykov, O.S. Zhukova, A.I. Arapova, A.M. Gritsenko, E.S. Kaptelova, D.E. Kashcheev JSC and D.G. KirnosThis work describes refinement of geological structure of the group of traps on the shelf of the Sakhalin island. The integrated interpretation of seismic and well logging data technology presented includes: detail analysis of tectonic faults system, rock physics analysis, up-to-date AVA seismic inversion software implementation, technology of reservoir properties, reservoirs presence and pore saturation prediction. Subsequent well logging data is well correlated with the predicted values.
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New Approaches to Interpretation of Geophysical and Well Data in Forecasting Hydrocarbon Accumulations in Oil–Gas Basins
Authors A.I. Kushmar, V.I. Mitasov and V.A. Kondrat’evCommercial hydrocarbon accumulations in carbonate deposits are not usually controlled by a structural factor. Forming reservoir rocks here is often associated with the secondary processes (solution, leaching, compaction) that is responsible for the reasonably complicated structure of interstitial space of carbonate rocks (particularly in saline environment) and the insignificant change of capacity properties in transferring from non-reservoir to reservoir (sometimes percent fractions). For recognizing such fine effects, it is necessary to pass gradually from petrophysical parameters determined on well logging data, core, testing to the attributes of a seismic signal (amplitudes, energy and others). Such a procedure is carried out by the way of successive constructing the petrophysical, geoacoustic and seismic-geological models. In the case of absence of density measuring in wells, necessary for geoacoustic modeling, it is calculated on the parameters of a petrophysical model. Practical examples for concrete fields of Eastern Siberia are given
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Forecast of Section Reservoir Properties Based on Seismic and Logging Data with the use of Genetic Inversion in Petrel Software Complex
Authors P.F. Popova and N.V. BuleevaTechnique and results of geological section forecasting using genetic inversion, performed in Petrel software complex (Shlumberger) is proposed. This technology helps to perform seismic inversion with minimum prior information. The first stage consists of nonlinear multitrace operator creation using genetic algorithms. This process employs seismic and logging data. Reservoir modeling with the use of seismic inversion results as a trend constitutes the second stage. Radioactivity logging is used for terrigenous section forecasting. It allows for the most complete section petrophysical properties differentiation with shale volume and NTG ratio assessment. Density log data was used in prediction of carbonate deposits section decompaction zones. Studies on this technology, performed in LUKOIL-VolgogradNIPImorneft Ltd. onshore within Volgograd Povolzhie and in the aquatic area of the North Caspian are represented. Here submitted are the results of genetic inversion integral accuracy test results for the field, mostly explored with drilling
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Chimney Detection as a Tool in Hydrocarbon Exploration and Prospect Evaluation–A Case Study from Persian Gulf
By S. sepahvandChimney detection is a technique which can be used as an exploration tool that provides important information for prospect evaluation and charged or non-charged prospects identification.The method applies multi trace seismic attributes, neural network modeling and the interpreter's insight.The approach shows how a fault can separate a reservoir in two parts with different hydrocarbon bearing behaviors.The results indicate in effect of fault sealing characteristic, The whole of reservoir horizons are not gas bearing and fault has divided it in two parts and acted as a seal and barrier between them
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3D Fault Detection Based on Statistical Approach
Authors A.G. Averbukh, E.R. Akhmetova, N.L. Ivanova and S.Y. GrafThis paper describes 3D fault detection methodology. As the destruction zone indicator we suggest some new attributes based on eigen-value analysis of seismic data. Multidimensional classifications are applied to separate faulted zone volumes. In particular, statistical cluster analysis allows to enter, formalize and consider in process similarity level of fault indicators. Thereafter we use advanced image processing algorithm to highlight faulted zones skeletons (surfaces). This method was approved on real seismic data
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Joint Automated Technology of Well to Well Log Correlation
The problem considered is necessity and possibility of automatic well-to-well correlation, for oil fields having a big number of wells. The conclusion is made that successful strategy is to find a compromise between formal automatic and informal interactive tools. Two different automatic procedures are analyzed, first one implemented in AutoCorr program and the second in DV-Geo modeling system. The analysis shows that the compromise existing in one system is complimentary to the compromise existing in the another. Thanks to this feature, joint correlation processing in AutoCorr and in DV-Geo becomes very efficient. New automated technology is realized by each system updating in part of share data processing tools. Examples of the technology application are shown as well.
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Modular Neural Networks Reservoir Properties Prediction
Authors D.V. Loginov JSC and A.S. Lavrik JSC JSCIn this article we represent new technology which can improve performance of the reservoir properties prediction based on the seismic and well data, while using neural networks as prediction mechanism. This technology contains three main steps . 1-st step - Statistical or neural model based attributes selection and transformation. 2-nd step - Formal (algorithmic) or informal (geological) clustering of the source area. 3-rd step - Special (modular) learning of the set of neural networks and construction of the cooperative network to predict reservoir properties. Especially this work represent the use of modular, cooperative neural networks to improve generalization accuracy of quantitative interwell reservoir properties approximation using seismic attributes, well data and formal and informal data clustering techniques. There is also the real sample to show modular neural networks improved performance.
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Effect of Porous Fluid Properties on Stoneley Wave Parameters
Authors V. Dorovsky, V. Dubinsky, M. Podberezhnyy and Y. NefedkinThe following primary effects are described and analyzed in our paper based on the performed thorough theoretical study, mathematical modeling and actual lab measurements: - Dependence on the Stoneley Wave Attenuation Length on the rock permeability. - Corrections to calculated permeability values introduced due to salinity of the saturation fluid. - Effects of specific chemical content of the porous fluid on derived permeability value.
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About Permeability Evaluation by Acoustic-magnetic Logging
Authors B.D. Plyushchenkov and A.A. NikitinNew way for permeability evaluation of fluid-filled rock surrounding an uncased borehole based on electrokinetic effect is suggested. This approach is based on Pride’s model describing the coupled propagation of acoustic and electromagnetic disturbances in porous elastic media saturated by an electrolyte. Arising acoustic and electromagnetic waves excited by an acoustic emitter. On the basis of numerical modeling it is established, that the ratio of complex-valued amplitude of Stoneley wave of azimuth component of magnetic field to complex-valued amplitude of Stoneley wave of pressure is very sensitive to variation of formation permeability and mudcake stiffness. These amplitudes are determined from expansions of registered wave trains of pressure and azimuthal component of magnetic field in terms of plain waves. For open and sealed pores on borehole wall the approximate analytical expressions for this ratio are presented. For these cases by fit of appropriate parameters of these expressions it’s possible to evaluate rock permeability.
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