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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
121 - 140 of 189 results
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Modelling of the Alterations of Filtrational and Electrical Near-Wellbore Zone Properties to Evaluate of Damaging
Authors A. Makarova, D. Mikhailov and V. ShakoSummaryDuring drilling and completion operations, mud filtrate and different mud components do invade into the near-wellbore zone due to ‘over-balance’ pressure and create multizone structures. The electrical resistivity significantly changes due to different electrical conductivities of mud filtrate and reservoir fluids. It well known that it strongly impacts the resistivity log data.
The developed technique includes a mathematical model of transient behavior of near-wellbore multiphase phenomena which takes into account mud component invasion/removal. It simulates the log response of the resistivity and allows for diagnosis, prevention and control of alteration of near-wellbore properties. The mathematical modeling of the direct resistivity log is considered, taking into account transient alteration of reservoir properties and fluid saturations in the near-wellbore zone due to invasion/removal components of drilling mud. The distribution of electrical resistivity is simulated on basis of results of hydrodynamic modelling of mud invasion process with taking into account salt transport and exchange between filtrate and reservoir water.
The paper discusses modification of near-wellbore zone properties due to filtrate invasion, fines migration, wettability alteration, capillary imbibition and impact of it on characteristics of damaging, well cleanup, production and on resistivity log data. The investigation is carried out for synthetic and literature field cases.
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Multiscale Volume Microscopy of Terrigenous Reservoir Core
Authors V.Y. Shklover, N.A. Artemov, P.R. Kazansky, V.P. Zagvozdin and S.N. KhakhanovSummaryThe present study aims to determine applicability of multiscale volume microscopy and analysis techniques for reservoir rocks characterization and to provide more accurate raw dataset for fluid dynamics modeling.
To that end:
- Microstructure yielded by traditional “digital rock” microCT was complemented with data on mineral composition and porosity on submicron scale.
- Reservoir properties were evaluated on widely different scales accounting for various porosity types. Wettability was locally evaluated in correlation with mineral composition of terrigenous reservoir core sample.
The correlative analytical microscopy studies conducted on terrigenous reservoir core sample yielded multiscale 3D images of microstructure and pore space, as well as 3D images of elemental and mineral composition superimposed within the same region of interest.
The dedicated software was used to integrate data obtained on different scales into a single pore space model.
The suggested multiscale technique for evaluation and upscaling porosity data was tested on a sample collection featuring different fluid dynamics for correlation with physical experiments results.
The feasibility of multiscale evaluation approach to terrigenous porous reservoirs characterization was cogently shown. For mineral composition and porosity of the studied samples the more accurate data were yielded.
A novel technique for evaluation of inner pore surfaces’ wettability was suggested
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Drilling ERD Well with Eyes Open with Reservoir-Scale Mapping While Drilling Technology, First Application in the Caspian
SummaryIn the beginning of 2015 LUKOIL and Schlumberger have implemented the new Reservoir-schale mapping while drilling technology for the first time in the Caspian sea, well 108 Korchagina field. The new technology application allowed for accurate placement of ERD (extended reach drilling) well within the productive interval. That have led to achievement of 88.5 % NTG (net-to gross) which is the heights in the field. Valuable surveillance data on OWC position was acquired, which is very important at the current stage of field development. Significant radius of investigation (in excess of 30 m) of deep electromagnetic measurements enabled drilling “with the eyes open” by remote mapping of formation boundaries. Thus good understanding of structural behavior in real time and supplementary exploration was acquired. Identification of the faults and their displacement magnitude facilitated 3D sector model update in the area of well drilling.
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The Influence of Neotectonic Processes on the Format Oligocen-Miocene Sediments of the Indolo-Kuban Deflection
More LessSummaryAs a result of work performed role of neotectonic processes on the formation of the block structure and seismic facies differentiation properties of the Indolo - Kuban deflection, defined the nature of disclosure-panel Cenozoic section and variability of its petrophysical and geodynamic properties. Shown the possibility and the role of vertical migration of hydrocarbons from the intervals of the intermediate complex of the Paleozoic - Mesozoic section.
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Seismic Attributes Application for Hydrocarbons Indicating, an Example from Black Sea
Authors O.V. Troshin and M.M. GestkovaSummarySeismic attributes and their applications in seismic interpretation. Multiattribute analysis for hydrocarbon indicating (amplitude, phase, frequency attributes). Review of Black sea Neogene hydrocarbon potential and its resources estimating.
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The Study of the Geodynamic Characteristics of the Rocks of the Tires on the Sakhalin Shelf
Authors G.Y. Shilov, A.V. Bondarev, V.Y. Kerimov, A.Y. Makarova and L.V. LyukshinaSummaryOn Sakhalin island and the adjacent shelf is divided into 3 Cenozoic basin, characterized by the specificity of sedimentary cover and petroleum potential of the North-Sakhalin, West of Sakhalin, Yuzhno-Sakhalinsk. To estimate pore pressures in the clay tires we used a method of equivalent depths, including its modification, when was established the presence of erosion of sediments.In sections of all wells confidently stands out cobicistat tire with pore pressure gradients to 0.18 MPa/m. In all likelihood it is a regional tire and securely retains hydrocarbon deposits in the horizon Dagi fields Kirinsky block. Verhnemutnovskaya tire that isolates hydrocarbon deposits in nizhnenutovsk the horizon of the Piltun-Astokhskoye field, the studied area appears to be less reliable than the lid in clay oxobicyclo the horizon. The pore pressure gradients here do not exceed 0.15 MPa/m. In all offshore oil and gas fields of Sakhalin basic petroleum potential associated with clastic porous reservoirs of the middle-upper Miocene-Pliocene and fractured-porous reservoirs of the Oligocene-Miocene of silicites
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Special Aspects of Uppernutovo-Pomir Complex Reservoirs Sedimentation and Formation in East Odoptinskii Area
Authors V.I. Shegay and Y.I. ShteinSummaryOn the basis of modern seismic data the construction of the sedimentation model of UpperNutovo-Pomir complex within the East Odoptinskii zone were carried out. The regularities of sediment accumulation and distribution were discovered in the area of the research. The influence of the East odoptinkoe lifting (sediment barrier) on the depositional environment of the Pliocene were estimated. Confirmed the presence of favorable conditions for generation of UpperNutovo-Pomir complex traps
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Problems of Using Modern Seismic Technology on the Russian Shelf
By Y.P. AmpilovSummaryThe paper addressed to issues related to the changes of the Russian oilfield services market in the fall of oil prices and sector of sanctions imposed by the US and the European Union on Russia. The factors that affect the foreseeable future on the oil quotations, marked the key trends in the global and Russian oilfield services market. Emphasis is placed on the need for a long-term individual domestic exploration and production technologies for the most key process steps
The abstract describes the main competing technologies to obtain a seismic record in a wide range of frequencies for shelf studies. These modifications of seismic exploration currently hold about half of the world market, while on the Russian shelf, they almost do not apply. The author analyzes the advantages and disadvantages of each method. It is concluded that the preference of using multisensor technology compared to other solutions. The report also analyzed the impact of sanctions on the use of new technologies Keywords: broadband seismic, offshore seismic, multicomponent registration, dual sensors, hydrophones, geophones
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Feasibility of Effective-Medium Anisotropic Models of Fractured Rocks in Seismic Characterization of Natural Fractures
Authors T.I. Chichinina, I.R. Obolentseva and G.A. DugarovSummaryWe deal with Effective-Medium Anisotropic (EMA) models of fractured rocks, which identify parallel fractures embedded in isotropic background rock. For example, there are Schoenberg’s linear-slip-fracture model and/or Hudson’s penny-shaped-crack model, which are widely used in seismic exploration. On the one hand, these models are considered to be of transversely isotropic (TI) symmetry and therefore such models can be identified by five independent components of stiffness tensor C. However on the other hand, the EMA models are identified by only four independent components, whereas their fifth component C13 is ought to be found as a function of other components. We analyze EMA model from the viewpoint of its constraint on C13. It has a certain physical sense related to elastic compliance tensor S. Following its interpretation in terms of the compliance tensor S, we found out that Poisson’s ratios are involved in the constraint. We inferred that the constraint on C13 rewritten in terms of the Poisson’s ratios appeared not to be feasible for real rocks. Therefore EMA models may not be applicable for prediction of the P- and SV-wave velocities at arbitrary incidence angle, because of the C13 required, which may be erroneously calculated in frames of the EMA model.
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About Surface Waves in Borehole and Procedure of Their Extraction
Authors A. Nikitin, D.R. Mulyukov and M. ChararaSummaryIn acoustic logging, as in laboratory research, the surface waves arise in borehole. Analytical search of surface waves is reduced to the solution of the dispersion equation, depends on the choice of branchcuts and is a complex task. However, there is TKO procedure for quickly decomposition of wavetrains on plane waves. Based on laboratory scale simulation, it is shows that the results of TKO procedure well agree with the solution of the dispersion equation, if you choose the vertical branchcuts. Classification of surface waves is suggested which can also be used in acoustic logging.
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Model-building Example of Effective-medium Anisotropic Model of Fractured Rock for Oil/Gas Shale Plays
Authors T.I. Chichinina, I.R. Obolentseva and G.A. DugarovSummaryShales exhibit poor hydraulic permeability and low porosity, and therefore stimulation by hydraulic fracturing is the primary mechanism commonly used to increase rates of oil and gas production in shales. Prediction of the azimuth of hydraulic-fracture growth and minimum horizontal stress requires a study of azimuthal anisotropy of rocks due to uneven distribution of horizontal tectonic stresses in the earth’s crust. In a general way anisotropic models of gas-oil shale deposits combine two constituents: external, namely azimuthal anisotropy (HTI model), and inner, namely anisotropy of shales (VTI model). The simplest azimuthally anisotropic model presents an isotropic medium with vertical parallel fractures. This is HTI model, i.e. the transversely isotropic (TI) with horizontal (H) symmetry axis. However the inner VTI shale anisotropy cannot be neglected. A superposition of these two symmetry types gives the model of orthorhombic symmetry (ORT). We present algorithm and concrete example of construction of the effective ORT model of fractured medium for shales in the form of the Linear Slip model with the two mutually orthogonal fracture systems. In the Linear Slip model for shale rocks, the horizontal micro-cracks between clay micro-particles are treated as planes of weaknesses and therefore can be perceived as horizontal fractures.
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About a Choice of Technical Solutions when Developing the Equipment for VSP
Authors A.V. Bagmut and V.A. BagmutSummaryThe report is devoted to the analysis of quality of information when performing modern borehole researches VSP, depending on technical realization of probes and some other parameters
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The Obtaining Seismic Images of Borehole Environment
Authors V.I. Bondarev and S.M. KrylatkovSummaryOne of the main tasks of the method offset vertical seismic profiling (VSP) is the building seismic image of the geological environment near the borehole. The process of obtaining the time (deep) section of the geological environment is called the offset VSP data migration. Two approaches are considered to perform this migration, based on different concepts about the nature of the detected secondary wave fields. The first approach assumes that the recorded wave field is a field of mirror-reflected waves. It is based on methods that use the principles of bringing well log data to the virtual observations at the earth’s surface. To this group belong and approaches emanating from the assumption that the recorded wave field offset VSP is a record only of the reflected waves from the combination of horizontally bedded borders. The second approach stems from the position that the recorded wave field is the field diffracted waves. It includes a large group of different migration options. On the basis of both approaches offer original ways of obtaining seismic images of the geological environment. Received proposed methods seismic image of the geological environment has the properties of migrated images. By controlling the parameters (shape, size, the number of calculation points, etc.) you can get the final seismic image different dynamic expressiveness.
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Hydrocarbon Microtremors: A Method of Microseismic Analysis with Conventional Seismic Data 2D/3D
Authors E.A. Hogoev, T.I. Chichinina and G.V. VedernikovSummaryWe study natural low-frequency acoustic emission from oil and gas reservoirs, also called hydrocarbons microtremors (microseisms). The method consists in analysis of frequency spectra of microseisms in conventional 2D/3D seismic data, for example prestack CDP gathers. In the contrast to the original version of the method (classical method of Vedernikov), our modified method deals with the use of the later arrival times, after all the arrivals of reflected waves. Whilst the classical method uses only the earliest arrival times, which are before the first arrivals of reflected waves. For distinguishing and separation of the microtremors, the best fit is the end parts of seismic traces, which contain weakened, totally attenuated signal from an artificial source (e.g. vibrator or explosion). That is the difference between the new method and the classical method, which uses only the initial parts of seismic traces. After numerous experiments on data processing to detect micro-seismic emission of hydrocarbons, we inferred the following criteria: that the offsets should be longer than 1 km and the time delays should be more than 3.5 seconds. Finally as a result of the method application, the microseismic spectrum anomaly of oil and gas reservoirs was found, which was confirmed by drilling.
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Passive Surface Microseismic Monitoring of Hydraulic Fractur-ing in Injection Wells of OJSC «Tatneft»: Results and Reliability
SummaryThe work highlights the results of assessing the validity of passive microseismic hydraulic fracture monitoring in injection wells in OJSC “Tatneft”. There is described the evaluation of hydraulic fracture monitoring results before and after hydraulic fracturing by using hydrodynamic (fall off) and tracer studies. The results of assessment are represented in the paper.
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Event Location and Determining its Seismic Moment in Heavy Surface Coherent Noise Using Maximum Likelihood Method
Authors E.V. Biryaltsev, V.A. Ryzhov, M.R. Kamilov and D.E. DemidovSummaryThe report presents our solution to the problem of detecting the position and definition of seismic moment tensor for single microseismic event in a strongly correlated noise. This problem is typical for surface microseismic monitoring of a developed field as well as for surface hydraulic fracture monitoring. We offer a solution to this problem based on the maximum likelihood method. There is shown an example of a synthetic event location in the real noise. We compare two variants of simplification of maximum likelihood method: Variance and Covariance. It has been shown that account correlations between real noise (covariance method) significantly reduces locations artifacts and in 10 times increases the signal/noise ratio.
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Features of Aerogeophysical Surveys in Polar Latitudes
Authors V.E. Mogilevsky, S.A. Pavlov, O.R. Kontarovich and G.I. BrovkinSummaryThe results of the aerogeophysical surveys, executed “GNPP Aerogeophysics” above the aquatorium of the Arctic Ocean are considered. The features of surveys in high latitudes are marked, which should to be taken into account at planning and production of works for their successful performance
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Capabilities and Newest Results of 3D TEM Studies in Eastern Siberia
Authors O.V. Tokareva, S.V. Kompaniets and Y.A. AgafonovSummaryThe paper describes capabilities of 3D TEM studies for the hydrocarbon exploration. Based on relations between reservoir properties and its geoelectric parameters derived from well-logs, as well as petrophysical properties, the most prospective zones are predicted. Also the methodical features of 3D TEM application for fault zones investigations are proposed.
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Integration and Integrated Analysis of the Methods of Exploration Geophysics for Searching Oil and Gas Deposits
Authors I.I. Khaliulin and N.N. YaitskiySummaryThe essence of the work lies in the complexing of exploration geophysics methods with the purpose to search for oil and gas. At the first stage of work the rapid forecast of hydrocarbon deposits (HC) was completed in the Cenomanian deposits on potential fields. In the interpretation system (IS) PANGEA the integrated analysis of the gravitational and magnetic fields was conducted.
The territory of the Yamal Peninsula is covered with a regular network of regional seismic profiles. When comparing the abnormal area with the crossing of its regional profiles on time section anomaly seismic record in the form of an area with absolutely horizontal axis in the phase of a reflector was detected. Thus the gas-water contact (GWC) displays on the time section in the geological interpretation.
After reprocessing and reinterpretation of seismic areal works, on which the abnormal region from the map perspectives gets, the GWC is clearly began to beat from the alleged Cenomanian deposit on time sections.
Thus, the first works on the integration of different methods of field geophysics gave a good result. The further forecasting of the deposits by this technology will continue.
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Physical Modelling in Exploration Seismology: Reasonability, Limitations and Perspectives of the Method
Authors V.V. Polovkov, D.A. Popov, M.V. Musin and E.G. ZhemchuzhnikovSummaryReasonability of physical modelling method for registration of seismic wave fields and its advantages and limitations in comparison with numerical modelling are shown. It is presented software-hardware complex for physical modelling, developed in “Seismo-Shelf” LLC, and examples of its use.
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