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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
21 - 40 of 210 results
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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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