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Geomodel 2015 - 17th science and applied research conference on oil and gas geological exploration and development
- Conference date: September 07-10, 2015
- Location: Gelendzhik, Russia
- Published: 07 September 2015
61 - 80 of 189 results
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Oil and Gas Potential of Frolovskaya Suite for Krasnoleninsk Arch
More LessSummaryA brief description of the geological structure of Frolovskaya suite and its analogues is given, as well as its position in the cross-section, lithological description, wave-based division, and depositional environments. Well materials and 3D seismic data interpretation were used to study the entire cross-section of Frolovskaya suite to identify the areas of potential net reservoirs. The learning is based on the upper part of the suite, AK1–3 reservoirs, with proved net reservoirs presence and their oil and gas potential. As a result of the work performed, it was identified that Frolovskaya suite can potentially contain other promising oil targets. Such targets may occur above horizon B in the zone of 60 - 40 ms (about 100 - 60 m) and under reservoirs AK1–3, 45 - 65m below the bottom. There is also a possibility of presence of lenticular oil bodies in the clinoform part of the suite
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Geological Structure of Pimskogo Seismostratigraphic Complex (the Case of Central - Gydan area)
Authors T.N. Toropova, V.M. Scherbanenko and T.I. ChernishovaSummaryAt the regional level, according to the seismic and drilling data, the pimsky seismostratigraphic complex represents a series of lithologic and stratigraphic clinoform complexes, which are sequentially pinch out in a northwesterly direction. The area of pimskogo seismostratigraphic complex was refined. The series of subcomplexes at zonal level have been identified in the complex, and traced by the area. Massive depocenter of the regional pimskogo seismostratigraphic complex was divided into regressive cycles of zonal level.
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Heuristic Method for Assessing the Resources and Oil Reserves of the West Siberian Oil and Gas Province (Frolovskaya structure, Nizhnevartovsk and Surgut)
Authors L.G. Gaysina and R.M. KuramshinSummaryThe thesis briefly described heuristic evaluation of resources and reserves of oil fields in Western Siberia. Given the geological characteristics of oil deposits of Jurassic deposits. The results of the research fields of Nizhnevartovsk and Surgut vaults and Frolovskaya structure statistical methods. It shows a comparative analysis of resources and reserves, obtained by statistical indicators - the average value, fashion and media
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The Geological Structure and Formation Conditions of Lower Cretaceous Deposits of the Festival Oilfield
Authors M. Solovev and A. KalininSummaryThe paper considers the geological structure features and formation conditions of petroleum reservoirs in Cretaceous sandstones in the south-east of the West Siberia. The Festival oilfield located in the Nurol oil-and-gas region is the object of the research. The tectonic processes influence on the formation of the Lower Cretaceous deposits was defined. It was concluded that within the Nurol megadepression and on the boards perspective reservoirs for the formation of hydrocarbon accumulations in Cretaceous sandstone are all local uplifts complicated by Cenozoic faults, are either in close proximity to these.
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The Magmatic Complexes and Geodynamic Evolution of the Pre-Yenisey Sedimentary Basin (South-East Of Western Siberia)
Authors Y.F. Filippov and S.V. SaraevSummaryBased on the analysis of the composition and distribution of magmatic complexes in the Vendian-Paleozoic Pre-Yenisey sedimentary basin and adjacent areas, absolute dating, the main stages of volcanism, which cover the period from Cambrian to Triassic, was determined. The conclusion is made about the distribution of magmatic foci to the south-west boundary of the basin, carried out the classification and correlation of the complexes, reconstruction of the conditions of formation. The geodynamic evolution of the Siberian craton in the Neoproterozoic is considered
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Tectonic Processes’ Influence on the Traps Formation of the Alexandrov Arch
Authors A. Kalinin and M. SolovevSummaryThe present research is devoted to assessing the influence of tectonic processes on the petroleum potential of the Upper Jurassic and Cretaceous deposits of the Alexandrov arch (West Siberia). The paper considers the evolution history of tectonic elements in which localized Upper Jurassic and Cretaceous reservoirs.
According to the research it is concluded that the most perspective for the formation of oil accumulations in Upper Jurassic deposits are anticlinal traps uncomplicated by Cenozoic faults.
The most perspective for the formation of hydrocarbon accumulations in Cretaceous sandstone reservoirs are anticlinal traps complicated by Cenozoic faults intersecting almost the entire Mesozoic-Cenozoic sedimentary cover.
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Priob Zone YNAO Prejurassic Basement Top Structure Predicted by Gravimetry and the Petroleum Potential Assessmen
More LessSummaryThis report describes the application area for structural imaging of different surfaces from potential field data. The method of predicting the preJurassic basement top structure is showed for understudied Priob zone and near-the-Urals Western Siberia territory. The predicted basement top structure identifies the hydrocarbon perspective areas for further detailed seismic survey
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Fluid-Dynamic Anomalies of Seismic Data in the Fields of Western and Eastern Siberia
More LessSummaryExploration experience in the fields of Western Siberia proves that the seismic data may contain information about genetically related phenomena of gas introduction and abnormally high pore pressure. In the salt-bearing interval of Siberian Craton, we have documented anomalies related to fluid migration.
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High Resistive Anomalies Beneath Permafrost Layer as New Hydrocarbon Prospecting Indicator
Authors D. Yakovlev, A.P. Afanasenkov and R.P. VolkovSummaryDetailed geophysical survey was carried out in 2014–2015 in Novotaymyr block located in Yenisey-Khayanga trough. One of main percularituy of the survey area is presence of sevral proven hydrocarbon deposits: Ozernote gas deposit, Payakhskoe oil deposit and baikalovskoe gas codensate deposit.
A specific patter was detected according to the electrical prospecting data interpretation: high resistive anomalies are presented above the hydrocarbon reservours at depth of about 300–800 m below permafrost layer.
Despite the lack of definitive conclusions about the nature of the revealed high resistive anomalies identified anomalies in the upper part of the section, the mere presence of these anomalies can be treated as hydrocarbon prospecting indicator that can be used in solving the following tasks:
- Prediction of oil and gas occurrence. Near-surface high resistive anomalies in the upper part of the section are directly linked with the industrial accumulation of hydrocarbons in the deep productive layers.
- Defining the boundaries of the deposits. In areas characterized by subhorizontal bedding and absence of non-permeable layers and/or subvertical permeable faults, the migration of hydrocarbons occurs mainly in the vertical direction. Therefore, based on the concept of nature, related to gas hydrates and free gas, it is possible to make an assumption about the similarity of dimensions and outlines of near-surface anomalies with hydrocarbon reservoirs at depth.
- Identification of zones of geological and drilling hazards. It is obvious that the accumulation of gas or/and gas hydrates beneath permafrost layer could cause destruction of engineering infrastructure structures and drilling sites on the surface.
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3D Scale-based Geostatistical Simulation of Porosity Heterogeneity in Sandstone Formation
Authors W.J.M. Al-Mudhafar and M. BondarenkoSummaryРазличные источники петрофизических свойств пласта приводят к разным моделям неоднородности пласта. Данных о пористости по результатам геофизических исследований больше, чем данных по результатам исследований керна. Распространенным способом пространственного моделирования является алгоритм кригинг, как наилучшая линейная несмещенная оценка пространственной неоднородности. В данной статье используется метод последовательного Гауссовского моделирования (SGSIM) для создания реализаций пространственного распределения пористости с учетом типа фаций по результатам геофизических исследований и исследований керна. Метод SGSIM основан на анализе вариограмм, что позволяет понять геометрию и непрерывность распределения коллекторских свойств. Модель распределения пористости по результатам геофизичексих исследований лучше, чем по результатам анализа керна.
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3D Pixel-Based Stochastic Lithofacies Modeling in a Tidal Sandstone Reservoir
Authors W.J.M. Al-Mudhafar and M. BondarenkoSummaryThe geological facies modeling is a crucial problem in the overall reservoir characterization as it affects the reservoir heterogeneities and fluid flow performance prediction. The main purpose of the research is to adopt the stochastic lithofacies modeling in a tidal sandstone reservoir (Main Pay) of South Rumaila Oil Field to build the geological structure of the reservoir. Based on the core measurements, the reservoir has three main lithofacies: Sand, Shaly Sand, and Shale as the literature indicates that it encompasses mainly of sandstone with some interbedded shale zones. In addition, the main pay formation was deposited in a tidal sand-rich environment that the sand channels are stacked and prevailed everywhere across the formation.
The Sequential Indicator Simulation (SISIM) has been used to build the categorical image, pixel by pixel considering the nonparametric condition distribution. SISIM depends on the variogram to address and model the variation between any two spatial points from the available data. Therefore, 12 different variograms have been built given the three lithofacies in four different directions: 0°, 45°, 90°, and 135° The resulted lithofacies models given the three lithotypes have indicated good matching with the original formation depositional environment of tidal dominated and sand-rich environment
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Application of Frequency-Dependent Analysis for Prediction of the Relative Changes in the Rermeability of the Reservoir
Authors A.I. Rozhkova, G.M. Goloshubin and A.E. KorolevSummaryTraditional approach to predict reservoir properties involves map construction of the expected net thicknesses and porosity on the base of dynamic attribute analysis of the wave field and inversion results. The reservoir permeability is an important parameter for field development, its forecast on the base of seismic data is not widely spread, although there are publications that illustrate the possibility of such forecast. The article presents the results of applying the frequency-dependent seismic attribute MOBATR, which characterizes the relative changes in the permeability of the reservoir. This attribute aimed at detecting frequency anomalies in the spectrum of the wave group, reflected from porous fractured reservoir. In accordance with the analytical solution, on which based the calculation of the attribute, its values change indicates on the proportional change in permeability along the reflector
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Effective Use of Seismic Interpretation for the Tasks of Geological Modeling
Authors Y.A. Dyakonova, D.S. Machukaev and Y.V. BiryukovaSummaryConsistency of seismic, geological and well data is an important task in the reservoir modeling. Conducting seismic interpretation in view of error determination and application of obtained results in creation of ensemble of realizations of the structural model allows for a probabilistic assessment of initial OIP and risk determination in well placement decisions, research conduction, etc. This paper discusses the impact of uncertainties of seismic data on initial OIP for fields with complex tectonic structure when turning from drilled to undeveloped parts of the field. It is shown that structural factor determined by seismic data greatly influences the spread of initial OIP probability estimates P90-P50-P10. A methodology is described for uncertainty estimation on the stage of seismic interpretation and results utilization for reservoir model construction.
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Viscosified Oil-Displacing Composition NINKA-Z: From Lab to Field.
Authors I.V. Kuvshinov, L.A. Stasyeva and V.V. KozlovSummaryThis work presents results of laboratory studies and field tests of viscosified oil-displacing composition NINKA-Z with controlled viscosity and alkalinity, developed at Institute of Petroleum Chemistry SB RAS. This composition is both oil-displacing and flow-diverting, and can be used for enhancing oil recovery by increasing reservoir sweep and oil displacement efficiency. Not only injectors can be treated by NINKA-Z, but also producers, with reagent-cyclic technology, similar to cyclic steam stimulation, without heating. Field tests were held in 2014 on steam flood area of Permo-Carbon deposit of Usinskoye oilfield. Five steam injection wells were treated, and results were observed on 75 producing wells. The effect was more than 10 thou.tonne of extra oil, proving the effectiveness of the technology.
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The Forecast of Change Field and Operational Wells According to the History and Research of Field
More LessSummaryOperational control wells should be based on the analysis of data of production history and according to the results of research field. To build complex models of operational management wells in the field it is advisable to use the methods of fuzzy logic. The effectiveness of fuzzy control due to the complexity of the description of processes for analysis using conventional quantitative methods or when the available sources of information are interpreted qualitatively, unclear or uncertain.
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Geological Prospects for The Searching of Missed Productive Reservoir Intervals on Samotlorskoe Field
Authors P.S. Utkin, T.A. Abramova, S.V. Shipichkin and E.V. EfremovaSummaryIn this paper were used well-logging of vertical and sub-vertical wells on Samotlorskoe field. A comprehensive approach for identifying prospective layers was reviewed and validated. Well-log interpretation results, geological model and development parameters were used and analyzed. We used wells data from estimation of reserves report, which was made in 2005.
Summary:
- algorithms for finding prospective productive intervals were developed and tested;
- maps of total initial effective oil-saturated thickness of extra-selected and non-perforated intervals were created;
- the basis for the assessment of the prospects and selection of wells for geological and technical activities was prepared
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Physicochemical and Integrated Technologies for Enhanced Oil Recovery From Deposits With Difficult-to-Recover Reserves
Authors L.K. Altunina, V.A. Kuvshinov and I.V. KuvshinovSummaryPresented are the results of laboratory studies, field tests and commercial use of new physicochemical technologies for enhanced oil recovery from deposits with difficult-to-recover reserves, including deposits of high-viscosity oils. The technologies are based on the concept of using reservoir energy or that of the injected heat carrier to generate in situ chemical intelligent systems – gels, sols and oil-displacing surfactant systems preserving for a long time a complex of properties being optimal for oil displacement and regulation of filtration flows. Field tests of “cold” technologies carried out on high-viscosity oil pool in Usinskoye oilfield have showed their high efficiency.
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Enhanced Oil Recovery on the Basis of Invert-Emulsion Solution with Simultaneous Use of Acid Composition
By V.V. SergeevSummaryScope:
Oil fields in the late stage of development are basically characterized by high rate water flooding of the formed products. The reason is the breakthrough of water from the reservoir pressure maintenance system by highly permeable interlayers of the layer. Our experiments showed that the usage of certain amount of invert emulsion solution (IES) decreases the water cut significantly and increases the oil recovery almost twice.
Processes:
Considerable advantage of IES in comparison with solutions which are carrying out the same functions is its ability to disolve at interaction with a hydrocarbonic phase, therefore, application of IES as the blocking solution will allow to decrease a colmatation of oil zones and selectively will isolate only water-bearing interlayer.
Special type of acid dissolves the carbonate component of the reservoir, increases the permeability of oil saturated interlayers and expand the drainage process significantly that results twice higher volume of oil extraction from the same bed.
Results
- Special IES solves the problem that exists in case of water flooding using polymers;
- Special acid composition contains a number of surfactants, water repellents and corrosion inhibitors.
- the effectiveness of technology of intensification of oil is confirmed within the field trial on Pashninsky oilfield in 2014
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New Perspectives of High Productive Wells Drilling in Low Permeable Reservoirs in West Siberia
Authors O. Boldina, E. Tsyganova, E. Samakova and Y. IonnikoffSummaryОсновным объектом разработки на территории Поттымско-Ингинского месторождения Красноленинского свода являются континентальные отложения верхней части тюменской свиты. Относящиеся к категории трудноизвлекаемых запасов пласты тюменской свиты имеют сложное геологическое строение: они характеризуются резкой литологической изменчивостью, как по разрезу, так и по латерали, коллектора имеют низкие фильтрационно-емкостные свойства. В данном докладе будет рассмотрен пример того, как тщательное планирование скважины: ее местоположения, конструкции, способа заканчивания – позволило пробурить высокодебитную скважину в неоднородных низкопроницаемых тюменских пластах.
Результаты атрибутного анализа сейсмического 3D куба, а также интерпретация сейсмических 2D профилей в зоне отсутствия 3D сейсмики, были использованы для выделения области развития меандрирующего речного пояса, относящегося к пластам ЮК2–3. Анализ результатов геофизических исследований скважин показал, что в пределах обнаруженной аллювиальной системы доля коллекторов составляет около 60%, мощность отдельных песчаных тел составляет метры, ширина - сотни метров. Для увеличения степени вскрытия коллектора было решено бурить в пределах найденного речного пояса скважину горизонтального типа с последующим проведением многостадийного ГРП. Конструкция скважины и параметры ГРП были оптимизированы с целью достижения максимального дебита и минимизации технологических рисков.
В итоге, пробуренная горизонтальная скважина запущена в фонтанном режиме с дебитом нефти, двадцатикратно превышающим дебиты соседних вертикальных скважин с большеобъемным ГРП. Полученные результаты показывают высокий потенциал разработки трудноизвлекаемых запасов при правильном геолого-инженерном подходе.
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Intensification of Oil Production Under Vibration Impact on the Producing Formation
Authors E.A. Marfin, Y.I. Kravtsov, A.A. Abdrashitov and I.S. MetelevSummaryImproving the efficiency of oil field development is possible due to the intensification of oil production by a vibrating impact on producing formation. Numerous laboratory and field research confirm this. Intensification of oil production is due to the many phenomena occurring in the productive strata at imposing elastic vibrations. Selecting the desired frequency of formation stimulation in this case is one of the important issues. The essence of the proposed idea is that the frequency of vibrating influence should be chosen close to the natural frequencies of noise filtration of producing formation. This paper investigates the spectra of noise filtration of samples of artificial and natural porous media. We present some results of the impact of elastic vibrations on the producing formation. It is shown that a greater effect in the oil production achieved at frequencies close to the frequency of noise filtration.
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