- Home
- Conferences
- Conference Proceedings
- Conferences
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
81 - 100 of 198 results
-
-
Field Development Analysis Based on Analytical Approach in Order to Improve Simulation Reservoir Performance Prediction
Authors V. Kalinic and M. KamartdinovReservoir simulation represents powerful tool for future prediction of reservoir performance. However it is exposed to subjectivity of reservoir engineer. Therefore, analytical approach is used to reduce subjective influence of interpreter and improve future reservoir performance prediction accuracy. Material Balance is used in order to reduce uncertainties prior to simulation modeling. Initially connected hydrocarbon volumes (STOIIP) was determined. This was followed by determination of possible reservoir compartmentalization and determination of hydrocarbon contact. Since adequate Material Balance model was determined, estimation of reservoir drive mechanisms through analysis of reservoir pressure and fluid production was performed. Further, more efficient history matching procedure was conducted. Eventually, future performance prediction using analytical approach was performed. Finally, results obtained using Material Balance analysis were used for more accurate simulation and performance prediction. These results were compared and studied in order to provide recommendations for field development optimization.
-
-
-
Regularity of Filitration Properties Distribution in Oil Bearing Reservoir with Complex Geological Structure
Authors V.P. Merkulov, L.A. Krasnoshchekova, M.O. Korovin and D.A. CherdantsevaThe main theme of this article is determination and investigation of permeability heterogeneity in oil bearing reservoirs provided on a certain oil field. The complex of methods reflecting the filtration permeability in rocks included: palaeomagnetical, petrophysical, lithological, morphological and microtextural analysis. As a result, of such investigation the directions of improved quartz grains orientation (in sandstones) were determined. Maximum magnetic and acoustic fluctuations are connected with detected directions and confirm the presence of fractured zones and pore space spread in sandstones. Spatial orientation of clastic material is dependent on flow potential and filtration characteristics that control the sedimentary basins and predefine the porous matrix structure and filtration heterogeneity.
-
-
-
Modelling of the Achimov Fm Development in the Context of Exploration Immaturity
Authors A.I. Kirillov and A.K. MaltsevThe work presents the results of sector geological and hydrodynamic modelling in three different facies zones of the Achimov Fm (distal, proximal parts, and alluvial fan apex) with the purpose of predicting oil production levels in the conditions of low exploration maturity of the field.
-
-
-
Optimal Sequence of Gas Field Investigations from the Kovycta Gas-Condensate Field
Authors I.V. Buddo, N.V. Misurkeeva, Y.A. Agafonov and A.S. SmirnovThe abstract describes experience of various geophysical methods application for Kovykta Gas-condensate field exploration. The sequence of geophysical studies for field exploration is shown as well as general geologic results. Shown than the best effectiveness of gas field exploration can be achieved when comprehensive analysis of geological-geophysical data is applied.
-
-
-
Reservoir Monitoring Offshore Sakhalin
Authors M. van der Veen and I. CheremisinaSakhalin Energy Investment Company Ltd. is developing the Piltun-Astokhskoye oil field and the Lunskoye gas field off the north-eastern coast of Sakhalin. As part its reservoir management strategy, Sakhalin Energy has conducted 4D seismic surveys to monitor oil and gas extraction and water injection. The company's first 4D survey was recorded in 2010 across the Astokh area. The information distilled from that survey supported development of the Astokh area in the following years. In 2015, the company recorded further 4D seismic surveys, this time expanding subsurface coverage to all of its producing fields. The year 2015 was selected on the basis of forward modelling of representative reservoir models of the fields to be covered. The surveys were designed to maximise repeatability between baseline and monitor surveys. The Piltun-Astokhskoye 4D survey was conducted in an environmentally sensitive area, which placed constraints on the geophysical operations in terms of timing and the amount of noise emitted into the environment. The resulting seismic 4D data will support future field development.
-
-
-
Integration of Earth Models in Total Seismic Response for Reservoir Monitoring
Authors A. Aristarkhov, I. Kerusov and D. MiroshnichenkoThe processes occurring in reservoir during its development are complex and interdependent. Corresponding changes of elastic parameters within the investigated interval influence seismic wavefield. The origin of such changes can be various and integrated. In order to split the integrated effects, it is necessary to attract multidisciplinary geoinformation. Each of the studied processes must be represented in the corresponding Earth model. This study demonstrates the influence, caused by reservoir development processes, on 4D seismic response. 4D seismic modeling was performed using the set of Earth models built for one of the offshore oilfields. As the result of the modeling, the optimal 4D acquisition technique was designed to register such changes of seismic wavefield.
-
-
-
Evaluation of Potential of Multi-Fractured Horizontal Wells in Comparison with S-Shape Wells on Field X
Authors K.D. Salavatullin and M.O. PisarevIn this work application of hydraulic fracturing in wells of different geometry (S-shape and horizontal) will be considered and selection of the most attractive geometry will be justified in conditions of the physical and economic constraints. Also we have to conduct fracturing optimization both in vertical and multistage fractured horizontal wells. Currently, there is no universal commercial software to provide optimization of fracturing, which take into account physical and economical constrains in real field condition. In the current project analytical model of fracture optimization design will be combined with simulation model to predict post-treatment production more accurate. It is worthwhile to mention that in case of horizontal wellbore geometry, optimization problem becomes more complex since issue of number of fractures selection arises. Whereas, the number of fracturing stages has influence on fracture parameters. Optimization will be conduct for the purpose of increasing of gas production and maximizing of economic efficiency.
-
-
-
Simulation of Reservoirs with Multiple Scale Fracturing
Authors S.P. Rodionov, V.P. Kosyakov, O.N. Pichugin and A.A. PyatkovThe share of the world's hydrocarbon reserves, related to fractured reservoirs is over 20%. Some studies have shown based on the Nelson criterion that reservoirs in Western Siberia with the terrigenous reservoir type are characterized by a significant influence of fractures on production. Tectonic disturbances have multiple scale features: there are non-conductive and conductive fractures as well as the decompression zone with small fractures. This raises the question of adequate reservoir modeling with multiple scale fracturing. The point is that a simulation of large fractures within the continuum mechanics framework is incorrect and a simulation of small fractures within the discrete fracture model is time consuming and impractical. It is also important to consider the relationship between fracture conductivity and pressure, and to be able to specify both conductive and nonconductive fractures. Therefore, it is important to develop an appropriate and productive software for this task. A new software was developed for simulating water flooding in reservoirs with multiple scale fracturing using novel numerical method. The relationship between fracture opening and water flooding performance was studied in fractured porous reservoirs accounting for the relationship between fracture permeability and pressure. The relationship between injection rate and production performance in fractured porous reservoirs was studied. Analytical and numerical study of the relationship between the well placement system and the oil recovery in fractured zonally heterogeneous reservoirs and porous reservoirs was performed.
-
-
-
Proppant Impact on Fractured Well Productivity in Gas Condensate Reservoir
By D. KrasnovGoal of current work is to estimate different proppant types and placements impact on well productivity in gas condensate reservoir which is developed by vertical wells with hydraulic fracturing. Theoretical review of processes in gas condensate reservoirs was conducted. Condensate distribution inside and around hydraulically fractured well was investigated. Equation for additional pressure drop due to presence of condensate bank was derived. Relative pemeabilities were obtained using modified Brooks and Corey model. Alternative description of non-Darcy flow in gas condensate reservoirs was considered. In order to provide sensitivity analysis for well and fracture parameters using different proppant types, mech sizes and various techniques of proppant placement original program was built based on MS Excel VBA. Approach for gas reservoir performance estimation was extended to gas condensate case. Main results of conducted sensitivity analysis for various proppants and placements are: 1. Condensate dropping leads to similarity in different proppant types and mech sizes use. Proppants become more similar in the production context with gas enrichment. 2. Consideration of alternative proppant pack placement such as creation of high permeable channels in current study may not give significant increasing of production in case of gas well.
-
-
-
Deep Structure of the Barents-Kara Region According to Geophysical Investigations Along 1-AR and 2-AR Geotravers
Authors A.S. Egorov, I.Y. Vinokurov, A.P. Kalenich, E.S. Belevskaya and A.S. AgeevPrincipal basis of the Earth’s crust deep structure investigations of Barents- Kara region and adjusent continental structures are DSS and CDP seismic sections. Additional features of the crust are estimated by results of inverse problems of gravimetry and magnetometry, magnetotelluric data and results of geothermic modelling. On the basis of these diverse data the radial-zoning model of the Earth’s crust was grounded. The principal objects of the model are: blocks (paleoplates) of continental type and interblock junction zones (structures of tension, compression or shear type). These objects are identified with confidence on geotransect sections and on maps as areas of geophysical parameters stationarity (blocks) or gradient zones (interblock junction zones). Comparison of coordinated map and deep sections of Barents- Kara region and adjusted continental structures provides imaging of regularities of spatial distribution of: cratons (East-European and Siberian); Grenvillian Barents fold area; Baikalian Timan-Pechora, Enisey an Taimyr fold areas; Hercynian Uralian and Central-West-Siberian fold areas; Cimmerian Paykhoi –Novozemelskiy fold area. Representation of sedimentary cover of Barents, Timan-Pechora, South- and North-Kara basins in the form of transparent layer of the map provides obtaining the principal new interpretation of deep structure of the Earth’s crust features, tectonics and geodynamics of the region.
-
-
-
Petroleum Potential of Paleozoic and Mesozoic Strata of Barents – North Kara Region Based on The Arctic Island Outcrops’ Studies
Fieldtrips, outcrops’ studies and further rock sample analyses are the cheapest and more effective way to get additional geological information about stratigraphy, lithology, petroleum potential and tectonic features of rocks of the Arctic region. In a period of 2013-2015 VSEGEI provides three fieldtrips for Rosneft Oil Company on Severnaya Zemlya, Novaya Zemlya and Franz Joseph Land islands. The same geological structure and age model of the onshore and offshore areas allow us to forecast lithological model, source rocks and reservoirs units and their distribution within the Arctic shelf area. So based on analytical data of rock samples main petroleum systems’ elements (source rocks, reservoirs, seals, possible migration pathways) and their geochemical and petrophysical characteristics were identified for North Kara and North Barents provinces
-
-
-
Overview and Timing of Main Structural Elements in the Northcentral Barents Sea and Impact on the L. Cretaceous Deposits
Authors B. Kairanov, A. Kayukova and A. EscalonaTwo stages of inversion are documented in the northcentral Barents Sea: Late Jurassic (Callovian-Oxfordian) and the Early Cretaceous (early Valanginian-Barremian). This is characterized with formation of several paleohighs which were positive structures during the Early Cretaceous. These paleohighs acted as local sediment source for interpreted wedges and as bounding structures for the regional NE-SW progradation of the Lower Cretaceous deposition. The NW verging faults that produced NE-SW oriented structural highs are predominant in the northcentral Barents Sea. Also similar anticlines and structural highs with a dominant NE-SW orientation are observed along the west coast of Novaya Zemlya and the northern margins of the South Barents basin. All of these structural lineaments are related to a Late Jurassic – Early Cretaceous compression/inversion and may indicate deformation from the East that could be responsible for the structural evolution of the northcentral Barents Sea in the Early Cretaceous.
-
-
-
The Geological Aspects of Evolution the North Kara Basin and East Barents Megabasin
The new episodes of basins evolution are shown based on the new reprocessing data and results of the onshore field activities. Rifting in the Barents Sea took place in the Late Devonian time; for the North Kara basin rifting took place in the Early Ordovician time. The north part of the Kara Sea was uplifted from Carboniferous time based on the apatite fission track analysis. The North Kara basin and Taimyr Peninsula were sedimentary sources for the Carboniferous deposits on the Novaya Zemlya archipelago based on the results of detrital zircons ages. The Middle – Upper Carboniferous sediments of the north part of the Barents Sea are mostly clastic
-
-
-
Stages of Exploration and Petroleum Potential in the South-Eastern part of the Norwegian Sector of the Barents Sea
Authors E. Bykova, A. Rabey, L. Surguchev, V. Koloskov, D. Nadezhkin and O. PinousThe Norwegian Continental Shelf is part of LUKOIL’s strategy; the company has been performing exploration activities in the area since 2012. “Former disputed area“ is still unexplored territory, however the recent large discoveries in the adjacent areas allow us to see the presence of hydrocarbon and plays within this territory. Within the study area, it is possible to define traps, predominantly of structural type. Petroleum potential of this area is connected to the Upper Paleozoic, Triassic and Jurassic deposits. Basin modeling results indicate sufficient amount of hydrocarbons generated during the geological history of the region, the presence of migration pathways and accumulation of hydrocarbons. The results of geochemical analysis of the seabed coring also indicate the presence of oil and gas accumulations. Exploration drilling campaign planned for 2017 will allow evaluating the commercial attractiveness of the identified prospects.
-
-
-
Seismic-Stratigraphic Complexes and Hydrocarbon Prospects of the Lower Cretaceous in the Barents Sea
Authors A.V. Mordasova, A.V. Stoupakova and A.A. SuslovaCretaceous strata of the Barents Sea shelf are still poorly studied in the aspect of petroleum exploration.Barents sea is also confirmed by the presence of uncommercial fields in the Lower Cretaceous of Hammerfest basin and Loppa high, gas shows in the Cretaceous strata of the Ludlovskoe gas field and of gas-hydrates in the South Barents trough. The main stage in the hydrocarbon potential evaluation is development of seismic-stratigraphic framework. The major sedimentary complexes are distinguished based on the seismic-stratigraphic, sequence and cyclostratigraphic analysis. Analysis of sequence boundaries, thickness and distribution result to reconstruction of history of sedimentation and paleogeography. The study includes regional seismic profiles and offshore wells data purposely to generalize a lot of scattered data and make a regional seismic-stratigraphic framework for Cretaceous strata.
-
-
-
The Outlook for the Search for Oil and Gas on the East Siberian Arctic Shelf
Authors G.A. Zavarzina, D.S. Shapabaeva, R.R. Murzin and O.A. ZakharovaThe North Wrangel block (eastern part of the East Siberian Sea) was licensed by LLC «Gazpromneft-Sakhalin» in 2014. Near-term outlook for the company is to accomplish regional geological and geophysical studies within the block. Hence the main target is to identify main tectonic elements, their evolution history and stratigraphic sedimentary fill. Subsequently based on this survey results HC generation, migration and accumulation conditions prediction, prospects identification, resources and risk assessment will be made
-
-
-
Integration of Seismic Data, Regional Geotechnical Studies in the Laptev Sea
Authors A.A. Kolyubakin, E. Bulgakova, A. Fridenberg, A. Nosov, Y. Petrichenko and S. SavishkinThe report discusses the results of integration of seismic data and regional geotechnical survey studies on the shelf of the Laptev Sea. The features of the geological structure of the study area, the structure of the near seabed section, and the necessity of joint interpretation of data in order to complement each other and linking the data of deep faults and seabed anomalies associated presumably with gassy sediments. The method and principles of choice geochemical survey in the study area described in the report, as well as the structural features of the upper part of the section related to relict permafrost and its degradation in a shallow East-Arctic shelf
-
-
-
Using Phenomenology, Holistic Models and New Technologies to Optimise the Development of Oil and Gas Reservoirs
Authors A.V. Petukhov, S.I. Egorov, A.N. Karyakov, R. Oppermann and A.A. PetukhovReport reviews the application of modern phenomenological and holistic models as well as innovative horizontal drilling technologies and interpretation 3D seismic to improve oil recovery of tight oil carbonate reservoirs. The new scientific model and an integrated approach in the development of unconventional carbonate reservoirs with low porosity. The systems was first implemented during the drilling of two horizontal wells in USA with the close cooperation of Russian, American and Australian experts. The concept of the model is aimed to identify high permeability fracture zones before drilling of the wells, their optimal crossing by the open horizontal hole and preservation in the process of drilling the primary of permeability of fractures, created by the nature itself, which can be considered as an alternative to multistage fracturing and other technologies which are commonly use in the development of hydrocarbons in tight oil and gas reservoirs. Received in the process of joint work results have been planning to be used not only to drill new wells to tight carbonate reservoirs and shales in South Texas, but also in similar fields in tight reservoirs in Western and Eastern Siberia, Timan-Pechora and Volga-Urals oil and gas basins in Russia as well as abroad.
-
-
-
CSP as a Complex Approach to Exploration and Exploitation of Hard-to-Extract Hydrocarbon Deposits
Authors G.N. Erokhin, A.N. Kremlev, E.V. Anokhina, D.N. Gapeev and A.V. KirichekFractured reservoirs are prospecting targets for oil deposit exploration. The research is based on ingenious method of prestack migration called FractureCSP. The work presents multifunctional surface small-aperture technology of microseismic monitoring that is designed for hydrofracturing, fluid injection and other geologic technical procedures control, as well for the revelation of reservoir fault block structures in interwell space during long-term passive microseismic observation. Presented are the integrated interpretation results predicting open fracturing zones in prospecting and exploration well locations.
-
-
-
Mathematical Models of Fluid Flow in Fractured-Porous Media
Authors Y.M. Laevsky, M.V. Vasilieva, A.V. Grigoriev and A.A. KalinkinThe problem of mathematical modeling of multiphase flow is closely linked with the problems of the development of oil and gas reservoirs. Big part of the world's oil reserves is located in fields with fracture-porous type collectors. Our presentation deals with mathematical modelling of the processes such reservoirs. This work presents some of the results obtained recently in the framework of the project, funded by the Russian Science Foundation. This is a whole complex computing tasks include, as a direct implementation of the model multiphase fluid flow in heterogeneous fractured porous media. in the presence of injection and production wells with access to the permafrost zone, and a number of auxiliary tasks: modeling of filtration gas combustion, the problem of constructing the new generation of efficient numerical algorithms. Here we present some results on incompressible fluid flow in heterogeneous fractured porous media. We deal with two approaches: direct description of cracks using detail meshes and double porosity models, based on G.I. Barenblatt’s approach (see, for example, G.I. Barenblatt, V.M. Entov, V.M. Ryzhik, 1984). In the last case we consider single phase and two-phase fluids separately. For two-phase fluid some new model of mass transfer between cracks and porous blocks is proposed.
-