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7th EAGE Saint Petersburg International Conference and Exhibition
- Conference date: 11 Apr 2016 - 14 Apr 2016
- Location: Saint Petersburg, Russia
- ISBN: 978-94-6282-179-8
- Published: 11 April 2016
41 - 60 of 198 results
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Uncertainty from Grain Scale to Reservoir Scale
Authors B.T. Wells, O. Hinds, R.A. Duller and R. WordenThe usefulness of reservoir modelling, and Earth modelling in general, is being significantly enhanced through incorporation of uncertainty analysis. Indeed the acceptance of geostatistics in general within the oil and gas industry relies largely on the ability of geostatistics to combine modelling of uncertainty with traditional modelling: the best prediction of values. This combination is accomplished by treating variance as a primary variable which has implications for those responsible for data collection. We seek to identify useful data collection strategies and highlight the changes necessary if data are to be used to model uncertainty in reservoir models.
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The Criteria of Decision-Making with Account of Risk and Uncertainty in Petroleum Exploration
Authors V.I. Poroskun and N.M. EmelyanovaThere are following criteria which are usually used while decision-making in petroleum exploration
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Evaluation the Value-of-Information (VOI) and Look Back Analysis During Modelling of the Exploration Works
Authors D.N Peskova, A.V. Sizykh and V.S. RukavishnikovPaper deals with actual problem about making decisions while development of the field. The main aim was to apply method ''Value of information'' in order to estimate the necessity of exploration works for the field and show the effectiveness of this method. The object of analysis - field X, which is located in the Eastern Siberia. The reservoir is B13 formation of Vend age. Field has complex structure, and divided into blocks by faults. During evaluation of the project, main uncertainties and oil in place were obtained for three blocks of the field. According to uncertainty analysis, it was suggested to drill new exploration well, and value of information method was applied to estimate results from this exploration works. Economic evaluation the value of information was made on the base of choosing optimal development strategy. According to the obtained results, drilling of the exploration wells for blocks 1 and 3 of the field X is a good decision, while drilling of a well in the second block is risky and not recommended. Also using the value of information, optimal well locations were advised – well 1_1e for the first block, and well 3_3 for the third block.
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Probabilistic and Statistical Model for Evaluation of Geological Uncertainties Influence on Project Economics
Authors M.V. Naugolnov, A.A. Borodkin, N.F. Teplyakov and M.S. BolshakovThis paper is dedicated to determination of the value of geological uncertainties and risks influence on project’s economic efficiency. Particularly, the developed software that is able to provide the full cycle of probabilistic and statistical oil field development evaluation is considered. The cycle of evaluation includes STOIIP estimation, reservoir evaluation (on depletion) and project’s economic evaluation
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A Stochastic Analysis of Value-of-Information Derived From Petroleum Systems Modelling
Authors A. Beha, G. Martinelli, D.A. Surovtsev and S.S. HuseinThis paper proposes a methodology to assess the value added to a prospect assessment through information provided by basin and petroleum system modeling methodology. The effects of a more detailed petroleum system model on a prospect assessment are usually more difficult to evaluate than the effect of new 3D seismic surveys on exploration prospects since the information provided by a BPSM has primarily a basin- or a play-wide extent. In order to evaluate potential benefits of a BPSM consistently we start by studying and evaluating in detail the ability of BPSM to predict hydrocarbon accumulations in a known (benchmark) basin. Second, we evaluate and quantify the sensitivity and specificity of this information in order to have a probability measure that could be generalized. Third, we apply such measurements to the assessment of the studied prospect in an analogue basin in order to calculate the revised geological chance of success. Fourth, we evaluate the impact of this revision on NPV through a full cycle analysis using a hypothetical development plan of the prospect to come up with a Value of Information assessment.
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Selection of the Optimal Regular Development Scheme under Conditions of Considerable Geological Uncertainties
Authors A.F. Nazmutdinov, A.P. Roshchektaev and V.N. SibilevThe objective of this project is to choose optimal development scheme of block Z Field Y that is stable for uncertainty in geology. “Optimal” here means “optimal in the mean” that brings the highest EMV. Absolute permeability field and relative permeabilities curves were chosen as uncertainties to investigate. Three relative permeability curves and three fields of absolute permeability were chosen, i.e. totally 9 geologies were involved in selection of the optimal development scheme process. Many calculations of various development schemes for each geologies (absolute and relative permeabilities) were made. Optimal completion type and well pattern were determined. Then there was an attempt to create NPV proxy model by means of spline approximation and artificial neural network. Both methods, based on 27 points for training showed poor results, that is number of training data points (simulation runs) should be increased to obtain satisfactory results. Obtained proxy models helps to assess influence of the Corey relative permeabilities’ parameters to production and therefore to the NPV.
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Integrated Sedimentological Analysis: a Key Approach for Volumetric Evaluation and Risk Assessment of Achimov Plays
Authors V.K. Piskunov, J. Rubino, S. Vitoux, T.S. Rychkova and O. SiccardiWidely spread in Western Siberia Achimov deposits are represented by fan complexes in slope and basin parts of Neocomian clinoform formation. Stratigraphic trapping plays a key role especially in areas outside of structural highs. Sequence stratigraphy analysis together with defining fan relationship with slope allows predicting main and intermediate seals effectiveness as well as reservoir position inside the clinoforms. Prediction of reservoir facies distribution combined with regional and worldwide analogs analysis also a key element for volumetric reserves evaluation. Defining of architectural elements such as lobes, slumps and channels helps to estimate reservoir geometry and range of key parameters (Gross&Net thickness, NTG, Porosity and Permeability). Thus complex sedimentological model based on logs, seismic, core and analogs analysis allows evaluating uncertainty range of parameters and probability of success especially in poorly well constrained areas. Such detailed approach resulted in identification of areas with reserves density above economic threshold. As a consequence exploration well drilling is now considered to prove the presence of developable reservoirs within the considered license.
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Studies of Mid-Jurassic Thin Beds in Conditions of Presence of the Anomalous Bazhen Suite (Shirotnoe Priobje Case)
Authors M.V. Skaryatin, A.V. Shubin, D.V. Klyazhnikov and V.I. RyzhkovAuthors propose guidelines for investigation of thin reservoirs in conditions of overlaying amplitude anomalies noise. The Mid-Jurassic rocks were deposited in different sedimentary environments. The lower part represents fluvial bodies deposited inland and in delta plain, and the upper part is transgressive shoreface sand. Small thicknesses of the sand bodies do not allow to be resolved in seismic due to the vertical resolution limitation. However, these bodies can be laterally resolved and mapped. The presence of coal beds and overlaying anomalous section of the Bazhen Suite complicates the interpretation. The proposed solutions include creation of the mask of the Bazhen Suite amplitude anomalies, combination of attribute analysis, inversion, Bayes probability classification and well data. The overlapped Bazhen mask with maps can filter the influence of the anomalous Bazhen Suite. As a result of the Bayes classification, the effective thickness map was formed. Shapes of the various attribute anomalies underline the lateral distribution of sand bodies and help in tracing of those. Well data provided facies control of the identified sand bodies. The applications of the proposed methods cover Shirotnoe Priobje region and other fluvial systems around the world, which are prospective in terms of discoveries of hydrocarbon accumulations.
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Jurassic and Cretaceous Tectonic Evolution of the Demerara Plateau – Implications for South Atlantic Opening
Authors K.C. Casey, A.K. Krueger and I. NortonThe Demerara Plateau is located on the northeast South America continental margin between 5° and 10° North, marking the northwest corner of the equatorial segment of the Atlantic Ocean. It is conjugate to the Guinea Plateau on the African margin which rifted from the Demerara during the Early Cretaceous opening of the Central Atlantic. Published studies of the Demerara Plateau are focused on its Cretaceous history, when the northern edge of the platform was formed by trans-tensional deformation along Atlantic transform faults, and its eastern edge by extensional deformation during rifting. The platform itself is commonly interpreted as a continental block left behind following South Atlantic rifting. Seismic data across the plateau reveal significant compressional deformation beneath an Albian unconformity. We suggest that this deformation is the result of early opening of the South Atlantic, with a rotation pole located close to the present-day Amazon delta. Allowing for this compression in plate reconstructions of the South Atlantic results in restorations which do not require large amounts of intra-continental deformation in South America, and consequently in a relatively simple plate model for the South Atlantic
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Prediction the Relative Changes of the Reservoir Permeability
Authors E.A. Korolev, A.I. Rozhkova, A.A. Shevchenko, K.A. Smirnov and G.M. GoloshubinTraditional approach to predict reservoir properties involves map construction of the expected net thicknesses and porosity on the base of attribute analysis of the wave field and inversion results. The reservoir permeability is an important parameter for field development and its forecast on the base of seismic data analysis 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, which can be characterized as an indicator of fluid mobility and may represent the relative changes in the reservoir permeability. This attribute aimed at detecting of frequency anomalies in the spectrum of the wave group, reflected from porous fractured reservoir. In accordance with analytical solution the changing of the attribute values along the reflector indicates the proportional variation of the reservoir permeability.
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Sedimentary Control as a key to Predict Natural Reservoirs Structure (Case Study of Pokur Formation, Western Siberia)
Authors V.A. Zhemchugova and M.O. BerbenevMost of hydrocarbon resources of Russko-Chaselskiy ridge is associated with reservoirs of Pokur Formation. It is composed generally of alluvial sandstones and shales. Due to genesis Pokur reservoirs have complex structure and localized spread within ancient alluvial plains. Performed integrated interpretation of well and 3D seismic data allowed to estimate new perspective fields and to geometrize oil and gas pulls.
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Givetian Sedimentation in the Southern Part of Buzuluk Depression
More LessStudy area is the southern plunge of Buzuluk Depression, which belongs to Middle Volga petroleum region (south of the Volga-Urals petroleum basin). Main hydrocarbon productivity is related to terrigenous and carbonate deposits of Eifelian and Givetian. They are represented by Klintsy, Mosolovo, Vorobyevka and Ardatov horizons within study area. These deposits contain oil and condensate pools in the Zaykinsko-Zorinskoe, Sakharovskoe, Garshinskoe, Rostashinskoe, Konnovskoe and other fields. Givetian productive sandstones and overlying clayey seals have various reservoir properties and complicated distribution of the reservoirs in the section. It is first caused by depositional environments. Complex analysis of results of macroscopic and microscopic core examination, well logs and seismic data interpretation allowed developing sedimentary models of Middle Devonian deposits. It became a reason for prediction of petroleum reservoirs distribution within the section. Givetian sandstone reservoirs within areas with increased thickness of overlying seals are the most perspective from the viewpoint of hydrocarbon productivity. Consideration of these sedimentological and tectonic factors may help to discover new oil and gas fields within the southern plunge of Buzuluk Depression. Application of received conclusions in oil and gas exploration may raise the level of its effectiveness.
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Technique of Paleochannels Identification Within Tyumen Suite Using Spectral Decomposition Method
Authors O.Y. Kirzeleva, T.N. Kiryanova, R.Y. Kopenkin, E.I. Bronskova and D.V. KlyazhnikovThis work uses real examples to consider the method of mapping the objects of riverbed genesis, which have been associated with Tyumen units in accordance with the results of Spectral Decomposition of 3D seismic data.
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Methodology of Detection of Oil-Saturated Zones in the Middle Jurassic Sedimentary Rocks in Western Siberia
Authors I.V. Privalova, G.M. Goloshubin, Y.A. Tcimbaluk and P.S. RusakovThe technique of detection of oil-saturated zones within Middle Jurassic reservoirs in cross-well space was shown. The methodology is based on the low-frequency amplitude analysis of the seismic data using the results of well logging. The technique involves accounting for reservoir's thickness variations, and allows to separate oil-saturated zones from water-saturated.
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Geological Modeling of Complex Traps of Oil and Evaluation of Prospects for Tight Reservoirs Bobrikovian
Currently, oil and gas industry is increasingly focusing on the development of unconventional hydrocarbon accumulations. Today there are questions to involve the development of a significant number of accumulations of oil and gas reserves that were previously considered uneconomic. So, the development of oil deposits, confined to bb-rd age sandstone reservoirs in one of the fields of the Samara region, showed excess amounts of cumulative production compared with the calculated reserves. Refinement of geological model based on the analysis and comparison of the data of drilling, seismic surveys , studies and testing core collectors suggesting that the source of unaccounted oil reserves may be part of the roof bb sand in the dome of raising with lower (below conditional values) data collector properties according to GIS.
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Retrospective Evaluation of the Structural Mapping Accuracy on the Oil Fields of the Company "Gazprom Neft
More LessStructural mapping is important part of seismic interpretation. In this study was analyzed the seismic data in several fields. Given the accuracy levels of mapping for different oil fields and differen geological intervals. Shows the change of mapping accuracy over time (drilling new wells).
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I3D Attribute Enhances Fault Recognition in Seismic Data
Authors Y. Yu and I. MardanovaUnderstanding the complexity of the fault system is critical for well path planning and production analysis. Currently there are few well known seismic attributes that are routinely used by geoscientists to reveal and display fault patterns in a formation. These attributes are based on the algorithms that are inferring geometrical properties from spatial variations in seismic Amplitude data. Although proved to be helpful for the fault identification, these attributes frequently exhibit low vertical resolution and presence of noise overall. In this paper we describe how new fault attributes (named I3D) can help to clean up the geometry-based seismic attributes and improve the fault identification.
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Evaluation Criteria of Model Stationarity, Based on Seismic Wavefield, in Terms of Seismic Inversion
More LessThe main methods of interpolation and extrapolation used in the interpretation of seismic, including seismic inversion, are based on the representation geological media, as a model that can be described by stationary functions. Synthetic model described the laws as measured from wells depends on the geometry of the irregular sampling of drilling data and on the position of geologic facies and existing wells. Using the seismic field, can allow more effectively assess the stationarity of model of the medium under study. This work is devoted to the study of the seismic wave field capacity to assess the stationarity of model of the geological environment and the analytical description of the model parameters, in addition the evaluation criteria of stationarity, based on seismic considered.
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Inflow Performance Relationship for Horizontal Oil Wells in Fractured Reservoirs
Authors A. Jahanbani Ghahfarokhi, O. Torsæter and M. MoradiInvestigation of the rate-pressure behavior of oil wells is of great importance in well performance evaluation and optimization. Several authors reported that for horizontal wells, the shape of the inflow performance relationship curves is similar to those predicted by the Vogel or Fetkovich methods or a combination of them. However, the complex flow regime existing around a horizontal well precludes using simple empirical methods that are limited in applications. This paper presents an analytical approach for determination of inflow performance for horizontal wells in fractured reservoirs producing during the boundary dominated flow regime using the results of well test analysis. The proposed method, which is an extension of a general approach previously presented by the authors, is then applied to an example horizontal well in a naturally fractured reservoir. The generated IPR curve is then compared with selected methods of horizontal well performance analysis. Results of comparison show that this study is in very good agreement with Joshi method which is a widely accepted method.
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Consideration of Possible Signs of Promising Oil and Gas Facilities in Western Siberia from the Position of Seismic
Authors S. Kiselev and I. GorbachevToday works are carried out related to the quantitative assessment of the parameters of the stress-strain state of rocks in areas with projected increased tectonic fractures that according to researchers, can provide greater confidence in the exploration and exploitation of new oil and gas deposits. Obviously there are problems associated with the exploration and exploitation of new deposits of hydrocarbons in reservoirs with predominantly fractured porosity occurred under the influence of tectonic forces. Anomalies of the elastic parameters of sedimentary rocks, obtained by modern tools, can be a valuable indicator of possible new sites search.
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