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6th EAGE Saint Petersburg International Conference and Exhibition
- Conference date: April 7-10, 2014
- Location: Saint Petersburg, Russia
- Published: 07 April 2014
21 - 40 of 174 results
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Petrophysical Properties Evaluation of Heterogeneous Gas Sandstone Reservoirs with NMR Logging Data
By G.M. HamadaSummaryPetrophysical evaluation of heterogeneous gas sandstone reservoirs is one of the most difficult problems. These reservoirs usually produce from multiple layers with different permeability and complex formation, which is often enhanced by natural fracturing. Therefore, using new well logging techniques like NMR or a combination of NMR and conventional open hole logs, as well as developing new interpretation methodologies are essential for improved reservoir characterization. Nuclear magnetic resonance (NMR) logs differ from other conventional logs. Integration of NMR logs, other open hole logs and SCAL minimizes uncertainties in the determination of formation porosity, permeability and capillary pressure curve.
This paper concentrates on determination of three petrophysical parameters of heterogeneous gas sand reservoirs; 1) Determination of DMR porosity, ΦDMR, it is deduced from NMR porosity and density porosity, 2) NMR permeability, KBGMR, it is based on the dynamic concept of gas movement and bulk gas volume in the invaded zone and 3) Capillary pressure, it is derived from relaxation time T2 distribution.
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Multi-scale Uncertainty Assessment for Geostatistical Seismic Inversion
Authors L. Azevedo, V. Demyanov, S. Focaccia and A. SoaresSummaryDue to the intrinsic nature of seismic inverse problems there is always uncertainty related with the best-fit inverse model. Traditional geostatistical seismic inversion approaches are able to account the uncertainty related with the stochastic simulation algorithms that are used as part of the inverse methodology for the model perturbation. However, they assume stationarity and no uncertainty related with large scale geological parameters represented for example by the spatial continuity pattern and the prior probability distribution of the property to invert as estimated from well-log data. We propose a multi-scale uncertainty assessment for traditional iterative geostatistical seismic methodologies by integrating stochastic adaptive sampling and Bayesian inference to tune the variogram ranges and the prior probability distribution of the property to invert within the inverse workflow. The application of the proposed methodology to a challenging synthetic dataset showed a good convergence of the inverted seismic towards the recorded one while the local and global uncertainty were jointly assessed.
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Creation of Vch Geological Formation Model of Verhnechonskoe Field on the Basic of Stochastic Inversion
By M.V. OsipovaSummaryThe main object of exploitation of Verkhnechonskoye field is VCh1 productive object. It is characterized by complex geological structure, a high lateral heterogeneity of terrigenous reservoir. Besides pores is salted by halite that has a significant impact both on the reservoir properties, and on the process of reservoir development. Therefore, the forecast methods of reservoir salinization development areas are very important. This problem is solved using stochastic inversion in the present work. The results of this type of seismic data interpretation form the basis of the Vch geological formation model. As a results we received
- the maps of reservoir net pay by regression relations between 2D maps of elastic properties and average value of net pay by well log interpretation results;
- Maps of salted non-reservoir thickness by means of vertical stack of geological model cells for which “salted non-reservoir” lithotype is determined
- Contour of massive salt thickness distribution that coincides with the zone of sporadic reservoir distribution specifies the boundaries of deposits distribution
- For the first time various gas oil contacts of the deposits were justified in the central and eastern part of the polygon.
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Reservoir Heterogeneity Influence on Hard-torecover Reserves Development - A Case Study of Achimov Fm, Vingapur Field
Authors A. Kondratyev, V. Rukavishnikov and L.N. ShakirzyanovSummarySimulation model calculation is a base method that used for the efficiency of development strategy calculations it is necessary to design geological and simulation models within which are defined reservoir properties and heterogeneity.Estimation of influence on reservoir properties of various kinds of geological uncertainties will allow defining more effective development strategy.
Achimov Formation of Vingapur Oil Field was considered in current study the Northern part field nowadays is quite attractive for the development of this formation. The aim of work was complex investigation of petrophysical properties for the purpose of it prognosis across the field and the effect of geologic uncertainties on production assessment. On the first step was studied the western part of the field where core data are available, next was developed algorithm for the properties prognosis and eventually was constructed geologic and reservoir simulation models for the investigation of the effect of geologic uncertainties in Northern part. Petrophysical model of the reservoir where for the evaluations was applied method of Rock Types identification, in addition to this, Hydraulic Flow unit approach was also employed, that makes possible reservoir properties estimation in less explored areas of the field where core has not been retrieved.
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Cyclicity, Geological Modeling and Reservoirs Characterization in NE Offshore Nile Delta (Ha’py Field - Case Study)
Authors N. Moustafa Amer, M. Darwish, A. El Barkooky and E. SharfSummaryA detailed study of the Ha’py Field area is preformed to build up a reservoir geological model based on lithofacies analyses of core and ditch cutting samples supported by wireline logs interpretation. The studied interval subdivided into five main lithological cycles(A, B, C, D and E), with different thicknesses. Based on defined Gamma Ray cut offs, six electrofacies are distinguished in the Ha’py wells. The reservoir units are represented by repetitive sedimentary cycles (A2, B1, B2 and C) of one facies. These units are seen as three retrograding sand bar systems, the oldest one is represented by the A2 subcycle followed by the B1 subcycle and finally the B2 subcycle as the youngest dominant bar. These are followed by the lowermost part of the C cycle. These sand bars are possible to be mouth sand bars (Suter, 2006) that are activated by syndepositional tectonics and controlled by global eustatic sea level changes. The depositional environment of the studied area was supposed to be turbidite deep water or slump (Bailey et al., 1998), where the present study proved by detailed palentological studies that it is shallow marine water.
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Approach to the Differentiated Assessment of Prospects of Oil-and-Gas Content of Basement Formations of the Base of West Siberia
Authors V.L. Shuster, S.A. Punanova and A.V. SamoilovaSummaryMethodical approach to the differentiated assessment of prospects of oil-and-gas content of local structures by basement formations is based on the system analysis, allowing to carry out a multicriteria assessment of a choice of rational sequence of drilling of the prospecting areas. The Choice program is used. Each geological parameter was given a probabilistic assessment.
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Sedimentological Analysis of TP1-TP5 Layers in the South Tambey Field Study Area, West Siberian Basin
Authors A.A. Astakhova, E.A. Birkle and E.B. BondarevSummaryThe South Tambey field is a natural gas field located at the northern part of West Siberian Basin, on Yamal peninsula.
The main objective of this paper is to reconstruct depositional environment, and the main aim is creating integrated geological model of the field and showing sand bodies’- distribution within productive intervals.
TP1-TP5 are essentially composed of paralic sediments.
During the process of core description we managed to recognize 13 facies. This facies have formed 8 facies association, which have been defined from Open Marine, Paralic and Delta plain Facies associations. Sometimes different facies associations have a similar facial composition, the main difference between which is sediments’ regime.
This data has been analyzed in Techlog software with well logs’ and petrophysical data. Afterwards we recognized 8 electrofacies.
For generating facies’ map we used the following succession:
- Core data analysis, especially facies association, as a most important criterion.
- Well logs’ analysis, more specifically electrofacies data and correlation pattern with sand bodies’ distribution and sequence stratigraphy content.
Electrofacies helped us to reconstruct paleoenvironment in the intervals, where core material wasn’t presented. - Seismic attribute analysis.
Paleogeographic environments of TP1-TP5 have been confirmed.
Maps with the most potential reservoirs have been created.
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Comparison of Spectral Decomposition Result of High Density Seismic Data and Conventional Data Spectral Inversion
Authors Y.V. Protkova, M. Stollenwerk, A.A. Dorofeev and A.P. ZhukovSummaryRecently the expectation of geologists regarding the detail of geophysical data has resulted in more stringent standards of seismic data resolution. However when using conventional 3D seismic acquisition we have a low fold for shallow intervals at the target level and deterioration of the lateral seismic resolution respectively. In this case the solution to the problem is to apply high density seismic acquisition which lets us to increase the fold. In cases when oil companies have already completed the conventional seismic acquisition they try to save their money by applying broadband spectral inversion for this conventional data in order to increase the seismic resolution. In this paper the analysis of spectral decomposition results of the high density seismic data vs. the spectral ThinMAN inversion of conventional data have shown that for shallow intervals the sole application of spectral seismic inversion (ThinMAN) doesn’t let us to achieve the lateral resolution level like for high density seismic data. The spectral ThinMAN inversion in some cases allows us to enhance the seismic high frequencies but with a decrease of signal-to-noise ratio. That makes it difficult to interpret the seismic data in detail.
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Problems of Creation of Petrophysical Models When Integrating 3D Seismic Data
Authors G.V. Takkand and S.V. LyagushovSummaryThe problems of creation of petrophysical models when integrated interpreting 3D seismic and log data on a group of oil fields are considered. A novel approach based on deterministic and stochastic models is proposed. The approach provides an appropriate level of data reliability and enables us to perform integrated interpretation of 3D seismic and log data on a group of oil fields.
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Perspectives of Application 3D Seismic for Kimberlite Exploration
Authors L.V. Maksimkina, E.M. Goncharov and V.M. BoyarovSummaryProposed to use 3D seismic survey to search for kimberlites. In article presented the results of three-dimensional seismic survey on the local pipe-shaped object.
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Mapping Reservoir Fluid Using AVO Inversion, Spectral Decomposition and Facies Classification
Authors A.A. Babasafari and H. KhoshdelSummarySeismic reservoir characterization helps to find more information about rock physics in oil and gas explorations. One of the important properties in reservoirs is hydrocarbon saturation. Fluid content discrimination on seismic data is possible if it is feasible in well data and seismic data has adequate quality. In this study a gas carbonate reservoir is evaluated to map fluid distribution using integration of AVO inversion and seismic attributes. Feasibility study of fluid content discrimination was certified in well data by cross-plotting Acoustic Impedance vs. Vp/Vs logs. AVO modeling represents fluid effect as well. Results of simultaneous pre-stack inversion were used to predict water saturation cube which completely discriminate gas from water around GWC on surface attribute map. By subtracting of far stack from near stack data and applying iso-frequency component attribute over the volume the pay zone was discriminated from non-pay zone around GWC. This was confirmed again by unsupervised facies classification. This field has been already interpreted structurally and depth map of reservoir has been built. The contour level of GWC on depth map somewhere was not coincided in comparison with the observed gas content as demonstrated above. It illustrates that calculated reserve will be increased.(Close to 0.2 STCF)
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Clay Minerals in Pore Spaces, Improving or Reducing Reservoir Quality - A Siliciclastics Reservoir of Northeast Iran
More LessSummarySandstones, due to their interagranular pore space are important reservoir rocks in petroleum industry. Clay minerals are often one of the common substances in sandstone rocks, and in their presence they affect porosity and permeability effectively. Identification of the types of clay minerals in sandstones is therefore a key to understanding their reservoir quality. This study is focused on the origin, formation, diagenetic processes and eventually influence of clay minerals on reservoir quality in one of the clastic reservoirs in northeast of Iran by XRD, XRF and SEM analysis, together with more than 2000 petrographical thin sections examination. The results indicated that altered feldspars and albeit with low amount of hematite are the main sources for clay minerals. Clay minerals can destroy permeability in sandstones rocks but chlorites grain-coating in this quartz-rich sandstones can help to preserve porosity and permeability, they also impede quartz overgrowths on quartz grains in this sandstone reservoir. Time and temperature of chloride coating formation were deduced from chloride rim thickness around the quartz grains. On the other hand occurrence of illite in this reservoirs is mainly related to the reaction of K+ from feldspar with kaolinite, which has reduced the reservoir quality.
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Forecasting Permeability from Other Physical Properties Obtained by Laboratory Core Analysis of Several Western Siberian Fields
By B.N. EnikeevSummaryAuthors compare different relations to calculate logarithms permeability on a representative sample of core measurements of West Siberia reservoir rocks (1000 specimens).Equation involving logarithm of the saturation parameter prove to be the most accurate.
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Analysis of Special Investigations Weakly Core at Different Species Composition of Cement
Authors N.Y. Moskalenko and N.V. GilmanovaSummaryВ настоящий момент в рамках изучения слабоконсолидированного керна особое внимание уделяется лабораторным экспериментам по фильтрации флюидов, определению остаточной нефтенасыщенности и начальной водонасыщенности, петрофизическому и литологическому анализу. Целью данной работы является определения основных фильтрационных характеристик пласта при наличии в составе цемента рыхлых пород как каолинита, так и монтмориллонита
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Non-conventional Reservoirs Detection and Evaluation of Saturation Behavior by Neutron Methods Suite
Authors A.I. Lysenkov, V.A. Lysenkov, E.V. Sudnichnikova and L.K. BorisovaSummaryThe report describes the best practice of experimental, research and pilot-plant works, regarding the application of neutron methods suite SNGK+2NNKt to determine the saturation behaviour of complex reservoirs in open and cased holes. When drilling wells for polymer drilling fluids with low filtrate invasion, due to man-induced impacts a non-associated gas is evolved from oil into wellbore, it creates favorable conditions for determination of oil-and-gas-bearing formations.
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Development of LWD High-frequency Resistivity Tool
Authors M.N. Nikitenko, M.I. Epov, V.N. Glinskikh, K.V. Suhorukova and V.N. EreminSummaryPaper is devoted to the development of the new high-frequency electromagnetic while drilling tool. The complex of basic algorithms and programs for numerical modeling of logging data for geosteering and formation evaluation purpose is developed. Numerical modeling of electromagnetic signals in the horizontal oil and gas wells is performed. It is shown that the signals are sensitive to the resistivity of the oil-saturated part of the reservoir, and also to its roof and bottom. Results of test borehole measurements are given.
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High-frequency EM Log Data Interpretation in Realistic Reservoir Models
Authors M.I. Epov, K.V. Suhorukova, V.N. Glinskikh and M.N. NikitenkoSummarySome aspects of the numerical interpretation of VEMKZ (High-frequency electromagnetic logging) data are considered in paper. Algorithms have been created for the solution of forward and inverse problems in numerical interpretation of electromagnetic logs in realistic models of terrigenous reservoirs penetrated by vertical, inclined or horizontal wells. The signals modified by dielectrical permittivity were investigated. There also have been developed algorithms for numerical correction of borehole rugosities and probe eccentricity effects. Effective algorithms for fast two-dimensional modeling and inversion were developed. Joint two-dimensional inversion for relative amplitude and phase characteristics measured in electromagnetic logging allows to estimate electrical conductivity and dielectric permittivity. Algorithms for modeling in inclined and horizontal wells allow to investigate signal features when approaching and crossing boundaries. High-performance calculations on GPU allow to carry out numerical interpretation of data in real time.
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Casing Integrity Monitoring by the Combined Defects detector EMDS-3 in Oil-and-Gas Wells of Oman
SummaryThe combined tool EMDS-3 has been developed, comprising an electromagnetic defects detector of increased transmission distance, temperature gauge, gamma-ray unit, crystal quartz gauge and software, allowing to determine a wall thickness of the first, second and third strings from the borehole axis. There are results of the third string studies, which are of current concern in oil-and-gas fields of Oman. Using such data as temperature, pressure and rock gamma-activity in a well makes the data interpretation of defectoscopy more accurate and complete.
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Magnetic Pulse Defectoscopy-Wall Thickness Measuring of Wells
Authors G.I. Golovatskaya, A.P. Potapov, V.N. Danilenko and L.E. KnellerSummaryThe report describes a method of magnetic pulse detection to solve the problems of well integrity studies, points out characteristic properties of different modifications of MID-K, MID-K-GK, MID-K-GK-S, MIDS-K-100 systems, gives an interpretation method in view of corrections for different affecting factors.
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Electromagnetic Defectoscopy Application with Neutron Methods Suite to Evaluate Safety of Gas Wells
Authors A.I. Lysenkov, V.N. Danilenko, L.K. Borisova, E.V. Sudnichnikova and A.O. GabbasovaSummaryThe report gives an analysis of electromagnetic defectoscopy application together with neutron methods 2SNGK+2NNKt+SGK to cope with evaluation challenges of casing strings integrity and borehole annulus fillup and provide industrial safety expert review of operating gas wells.
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