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Tyumen 2009 - EAGE International Conference and Exhibition
- Conference date: 02 Mar 2009 - 05 Mar 2009
- Location: Tyumen, Russia
- ISBN: 978-94-6282-095-1
- Published: 02 March 2009
1 - 20 of 108 results
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Rock Physics And Seismic Characterisation Of Thin Clastic Reservoirs In Western Siberia
Seismic characterization was carried out to reduce uncertainties associated to the reservoir
distributions in the 1_2 and 2 oil sands. The main targets were to determine the parameters that control
reservoir quality and seismic, and update the existing geological models. Reservoir quality variations and
sand thickness estimation in the interval 1_2 were among the key questions to address. The results of the
seismic modelling show that the presence of carbonate (both cement and stringers) acts as one of the main
controls on porosity and also on the seismic signal. Our Rock physics analysis also shows that a strong
relationship exists between P impedance and total porosity in the well logs. We inverted the amplitude
seismic volume to generate P impedance and used rock physics based regressions to compute a total porosity
volume, the correlations obtained with log data were higher than 90%. Porosity based reservoir distribution
maps were extracted for the 1_2 and 2 reservoirs. We also used a Neural Network algorithm as to identify
sedimentological features from seismic, used as additional support to the geological modelling. Finally, the
seismic property estimations and seismic facies classification maps were incorporated into the reservoir
Geomodel.
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Estimating Depth And Shape Of Geological Bodies By 3D Nonlinear Inversion Of Magnetic Data
Authors Hormoz Jahandari, Behrooz Oskooi and Mohammad Ali KarimiIn this study we evaluate the use of nonlinear inversion of magnetic data for estimating depth and
shape of geological bodies with complicated distribution. Our FORTRAN 90 program discretizes the survey
region into a grid of vertical prismatic cells. Then choosing an initial depth for the top and bottom of all the
prisms, uses the Marquardt-Levenberg algorithm to determine the unknown parameters by an iterative
approach. The optimized prisms together form the body's distribution. In order to test the viability of this
method, we have tested the program by inversion of synthetic noise contaminated data and real field data
from Zanjan, Iran. We assume that there is no remanent magnetization and that the magnetic data are
produced by induced magnetization only, neglecting any demagnetization effects. To put constraints on the
inversion of real data, we determine the range of magnetization variation by performing rock magnetic tests
on core samples from the region.
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Rock Physics In Complex Reservoirs – The Key To Understanding Their Seismic Responses
Authors S. Klarner and O. ZabrodotskayaRock physics studies are performed to develop a better understanding of whether the properties
of the rocks encountered in a well allow for seismic delineation of target lithologies and pore fill fluid, and to
give an estimate of the uncertainty associated with amplitudes and corresponding elastic responses. In a
number of areas in Russia, like West Siberia or offshore Sakhalin, pure grain-supported quartz sandstones
following published trends, are not very common. In many cases, the reservoir is either a complex
mineralogical mix with an intricate diagenetic history, or represents a shaly sand subfacies in a continuous
transition between shales, siltstones and sandstones. In addition, many of these reservoirs are locally or
regionally overpressured, therefore, before starting to interpret any seismic amplitudes, the applied rock
physics models need to be calibrated using local well data. The work presented constitutes a step on the way
to integrating the results of recent rock physics analysis on reservoirs from hydrocarbon-bearing basins in
Russia into the framework of rock physics of complex reservoirs developed on worldwide examples over the
past years.
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Изучение упругих свойств сложных коллекторов – ключ к пониманию их отклика в сейсмических данных
Authors С. Кларнер and О. ЗабродотскаяRock physics studies are performed to develop a better understanding of whether the properties
of the rocks encountered in a well allow for seismic delineation of target lithologies and pore fill fluid, and to
give an estimate of the uncertainty associated with amplitudes and corresponding elastic responses. In a
number of areas in Russia, like West Siberia or offshore Sakhalin, pure grain-supported quartz sandstones
following published trends, are not very common. In many cases, the reservoir is either a complex
mineralogical mix with an intricate diagenetic history, or represents a shaly sand subfacies in a continuous
transition between shales, siltstones and sandstones. In addition, many of these reservoirs are locally or
regionally overpressured, therefore, before starting to interpret any seismic amplitudes, the applied rock
physics models need to be calibrated using local well data. The work presented constitutes a step on the way
to integrating the results of recent rock physics analysis on reservoirs from hydrocarbon-bearing basins in
Russia into the framework of rock physics of complex reservoirs developed on worldwide examples over the
past years.
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Связь структур и разломов осадочного чехла со структурами палеозойского фундамента по результатам интерпретации потенциальных полей различных масштабов
Authors Е. А. Пряхина, Т. В. Рискова and К. И. АбаеваOn the basis of surveys of potential fields (scale 1:200 000) the new scheme of a structure of the Paleozoic folded basis of the central part of Yamal-Nenets Autonomous region (Nadym-Pur interfluve) is received. The graben and shaft systems in the Paleozoic base is allocated and various connection with these systems structures of a sedimentary cover is established.
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Subsurface Structures And In-Situ Stress Orientation Of Ilam And Sarvak Formations Using Fmi: A Case Study Southwestern Iran
Identification and description of subsurface structures in petroleum reservoirs is a vital
importance. For this purpose there are many sources of data. One of these is borehole imaging technology. In
this study we have characterized geological features and structures such as fractures, cross bedding, paleocurrent
direction, borehole breakouts and in-situ stress orientation of Ilam and Sarvak Formations in
southwestern Iran using Fullbore Formation MicroImager (FMI). The results show that image logs have
many applications in integrated hydrocarbon exploration (geological, geophysical and geomechanical
studies) especially in wells without any core available.
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Влияние аргиллитов георгиевской свиты на формирование залежей нефти и газа в верхнеюрских отложениях юго-восточной части Западно-Сибирской плиты (Томская область)
Authors Т. В. Жилина and М. Е. МартыновThis paper describes the influence of Georgian suite argillites on the oil and gas deposits in Vasugan suite including Lyvovsk, Uzhno-Tabagansk, Boltn and Kulginsk areas. The following relationship was determined - in the well cross-section of the Georgian suite thickness, which is more than 7-10m, as a rule, there are no hydrocarbon deposits in the Upper Jurassic low-seated reservoir sandstone layers. It has been concluded that fractures and disjunctive destructions influence the deposit formation.
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Микросейсмический инфразвуковой мониторинг залежей углеводородов
The experience of applying microseismic infrasonic exploration method ANCHAR to the timelapse
monitoring the outlines of pay zones of oil and gas reservoirs under production accounts for more than
10 years. Presented are results of microseismic monitoring for a number of targets – Kaluga underground gas
storage facility, Orenburg oil-gas-condensate field and etc. In all these studies the position and displacement
of the outlines of pay zones were reliably fixed by microseismic and verified by independent methods. The
results demonstrate high prospects of applying the ANCHAR monitoring to post-exploration and operation
of HC reservoirs and underground gas storage facilities.
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Using Radon Transform For Efficient Acoustic Wave Separation By Velocities In Wireline And Lwd Acoustic Logging
Authors Rais D. Achmetsafin, Vladimir Dubinsky, Doug Patterson and Chen LiDifferent acoustic wave components in the borehole acoustic logging differ by frequencies,
amplitudes, travel times, and velocities. Depending on the application, some of these components are
considered to be informative, and others are detrimental. In some cases, wave propagation conditions and
certain tool design limitations do not allow distinct separation of these components without destructive
interference between them. Simple time-frequency filtering does not always solve these problems. For
example, in case of poor quality of casing cementing job the casing “rings”, and this ringing dominates the
informative signal of interest that propagates through the formation. The frequency separation is inefficient
in this case, due to the overlapping of the signal frequencies. We propose adding “time-velocity” signal
representation to the traditional “time-frequency” consideration. We demonstrate incremental improvement
in the data quality when progressing from the traditional Semblance method to the improved non-windowed
Hilbert Semblance, and finally to a special case of the Radon transform. We believe the proposed approach
can be adapted and efficiently used for different borehole acoustic or seismic applications.
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Использование преобразования радона для эффективного разделения волновых составляющих по скоростям при акустическом каротаже на кабеле и в процессе бурения
Authors Р. Д. Ахметсафин, В. Дубинский, Д. Паттерсон and Ч. ЛиDifferent acoustic wave components in the borehole acoustic logging differ by frequencies,
amplitudes, travel times, and velocities. Depending on the application, some of these components are
considered to be informative, and others are detrimental. In some cases, wave propagation conditions and
certain tool design limitations do not allow distinct separation of these components without destructive
interference between them. Simple time-frequency filtering does not always solve these problems. For
example, in case of poor quality of casing cementing job the casing “rings”, and this ringing dominates
the informative signal of interest that propagates through the formation. The frequency separation is
inefficient in this case, due to the overlapping of the signal frequencies.
We propose adding “time-velocity” signal representation to the traditional “time-frequency” consideration.
We demonstrate incremental improvement in the data quality when progressing from the traditional
Semblance to the improved non-windowed Hilbert Semblance, and finally to a special case of Radon
transform. We believe the proposed approach can be adapted and efficiently used for different borehole
acoustic or seismic applications.
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Структурно-тектоническое районирование территории с целью выделения поисковых объектов
Authors Т. В. Бабаева and М. Б. ЛурьеIn this paper we present example of seismic data multidimensional classification for HC exploration planning in Western Siberia.
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Особенности геологического строения, влияющие на эффективность работы с простаивающим фондом скважин Усть-Харампурского месторождения
More LessAn ever-growing share of fields go into late stage of the exploitation with a high degree of water
cutting of well production and dominating fraction of standing idle fund of wells. The similar tendency accounts
for excess of costs for utilization of great amount of extracted water over profit on realization of oil that compels to
reduce rates of drainage and to abandon drowned wells. In spite of considerable residual reserves loss of the control
above water encroachment can lead to end of process of development with total water encroachment of bed which
can make more than 60% from initial recovered reserves. Accumulation, analysis and systematization of a
geological material and information from oil-fields on the present problem will allow to choose strategy of the
further development effectively.
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Новые крупнейшие структурно - тектонические элементы на севере Сибири и перспективы их нефтегазоносности
By В. А. БалдинThe regional seismic explorations using extended depth of investigation CDP-2D method were
performed for the first time in the beginning of XXI century on Taimyr. Along with the other geological and
geophysical sets of data it made it possible to change fundamentally the structure model of Enisey-Hatanga
regional trough and adjacent territories of Gorny Taimyr, Siberian Plate, Western-Siberian Plate. The new
largest (of superorders and I-II orders) structural and tectonic units were defined on the north of Siberia.
From the new points of view were evaluated petroleum potentials of Western Siberia north-east, Siberian
Plate north-west and the western part of the Taimyr fold system. High levels of petroleum potential are
connected with the prospecting of large and unique oil and gas fields in Mesozoic deposits of Obsko-
Laptevskaya ridge and Ust-Eniseyskiy trench (Ust-Eniseyskaya NGO of Western-Siberian NGP), and in
riphean-paleozoic deposits of two petroleum potential areas: Igarsko-Norilskaya on the north-western part of
Siberian Plate and South-Taimyrskaya of the Taimyr fold system. Large hydrocarbon potential zones are
represented by frontier superorder ridges of large extent (more than 1000-1800 km).
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Анизотропная глубинная миграция с использованием томографии для оптимизации скоростной модели
Authors Г. А. Банников, П. Беннион and Л. ГейгерModern technologies of seismic processing allow more accurate consideration of all the various aspects of Velocity Model Building of investigated geological objects. The anisotropic character of various geophysical properties, including velocity characteristics is a very important feature of the majority of geological objects. It is very important to consider correctly the anisotropy of velocities at the performance of procedures of the accountability of Migration. The more difficult the geological section is, the more effective can prove this approach at construction of Depth Velocity Models. Some contemporary options of anisotropic Depth Migration in conditions of salt dome tectonics are shown on the example of the implementation of three algorithms of Depth Migration: (a) Kirchhoff, (b) Wave Equation and (c) Reverse Time. It is recommended that the process of construction of Velocity Model and specification of velocities on various structural floors of an investigated section should be carried out with the use of the tomographic approach. There are some examples of comparison of isotropic and anisotropic approaches on various algorithms of Depth Migration, and also the detailed illustration of the efficiency of tomography in conditions of gradient velocity environment with the presence of high-velocity carbonate object.
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Влияние вибрации на процесс прямоточной капиллярной пропитки горных пород
More LessThe laboratory experiments were carried out to investigate the influence of vibration on the
process of capillary imbibition of rocks (core of oil reservoirs). The cores of sand oil-filled reservoir were
studied. The capillary imbibition of cylindrical cores have direction from lower end of core which contacted
with water. The curves of capillary imbibbition were determined by the method of continuous weighing. The
curves of imbibition were approximated by power functions f (t) ! t a but the index a was equal to 0.35-
0.42 rather then 0.5 (theoretical value). The average value of capillary conductivity – 1-2⋅10-8 m2/s. Vibration
with frequency of 10-40 Hz and magnitude of 0.1-0.5 mm leads to increase of the capillary conductivity by
15-25 %. We suppose that the influence of vibration is connected with changes of wettability of rocks.
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Опыт практического применения рентгеновской томографии полноразмерного керна
Authors Д. А. Беженцев and И. В. ФедорцовFull size core ctscan advantages are summarized in this paper. Case study of core cubic density determination, fracture intervals separation and fractures orientation estimation, cavity and/or infilling ore minerals separation, content quantitative assessment and rock features texture separation, with parameters quantitative assessment capability in 3D visualization program Avizo have been performed.
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Теоретические аспекты и опыт использования низкочастотных микросейсмических исследований при разведке залежей нефти
Authors Е. В. Биряльцев, A. A. Вильданов, Е. В. Еронина and В. А. РыжовKnown effects of abnormally high microseismic noise on low-frequency range (1-10 Hz)over the
oil and gas deposits. The report examines the validity of the practical application of this effect in prospecting
for oil. Shown a comparison of the numerical modeling of microseisms in the environment with
hydrocarbons deposits vs. the experimental data in similar geological conditions, as well as the results of the
identification of correlation between reservoir parameters and the parameters of observed anomalies in the
spectrum of microseisms. We show the usefulness of this spectral anomalies as an indicator of the
availability of oil and gas deposits in the research area, including in the case of small and complex
hydrocarbon traps.
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Application Of Advanced Filtering Techniques In The Analysis Of Cbl Data
Authors A. O. Bolshakov, J. Zhao, E. J. Domangue and V. S. DubinskyRapid technology development and the introduction of new technologies for borehole acoustic
measurements over the last several years prompted scientists and engineers for new data acquisition and
signal-processing techniques to support these technologies. Recent advancements in compact low-noise
high-resolution electronics also stimulated this process. To address new challenges in this area we developed
some new methods aimed at the improvement of signal-to-noise ratio (SNR) that can be applied to various
acoustic logging scenarios. The methods and techniques suggested are confirmed based on the results of
experiments with shear horizontal waves applied for cement bond logging (CBL).
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Практический опыт реализации многопрофильного проекта по моделированию пластов Ю2-Ю3 тюменской свиты
Authors Д. Борисенок, О. Пинус and Т. ГречишниковаВ последние годы значительно возрос интерес к детальным геологическим изучениям нижних
горизонтов чехла Западно-Сибирского бассейна. Это объясняется в первую очередь активным вводом
в разработку продуктивных пластов с этих интервалов на многих месторождениях, а также
открытием здесь новых залежей и месторождений в результате геологоразведочной деятельности.
Из продуктивных нефтеносных объектов нижних горизонтов чехла особый интерес
представляют среднеюрские песчаные пласты тюменской свиты, поскольку они часто содержат
коллектора хорошего качества и значительные запасы на многих месторождениях практически по
всей территории Западной Сибири. Вместе с тем, сложность их геологического строения обусловила
второстепенный интерес в плане введения их в разработку по сравнению с относительно более
простыми верхнеюрскими и неокомскими пластами. Сложность строения пластов тюменской свиты
вызвана прежде всего их пространственной невыдержанностью, частыми литологическими и
фациальными перехоодами, вариациями уровней ВНК, и т.д. Все эти факты объясняются прежде
всего преимущественно континентальными условиями осадконакопления при формировании
пластов, а также их большей тектонической дислоцированность по сравнению с вышележащими
объектами. Таким образом, глубокое понимание процессов осадконакопления и тектоники
обусловивших внутреннюю неоднородность объектов тюменской свиты представляется
принципиально важным для построения высококачественных моделей залежей и оптимизации
процессов их разработки.
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Капиллярный эффект при разработке нефтяных залежей - как новый взгляд на механизмы вытеснения нефти на четвертой стадии разработки
Authors А. Г. Борисов and Р. И. МедведскийCapillary forces and interfacial tension plays a sufficient role in the oil-field generation. A lot of
facts are conformation of it, such us water-to-oil area existence, difference in oil recovery factors for oil-wet
and water-wet rocks et al. Last one confirms existence of influence of capillary forces at production activity
of the oil-field. Despite obviousness of capillary forces work, heretofore practically no one attempt was made
to estimate contribution of it in oil production and take into account them in reservoir simulation. Authors
suppose that conventional laboratory researches are unsuitable for this process researching, therefore at this
work production-decline curves in oil and gas fields at third and forth stages were researched. It was taken
into account also double phase existence that is corroborated at major portion of West Siberia fields and
objects of research. After mathematically description it is proved by authors’ research, that rate of production
value can be decomposed into exponential quantity and a constant magnitude. Authors suppose that
exponential quantity reflects reservoir washing process and constant magnitude – capillary forces influence.
During the work the equations were picked out to estimate oil production and predict it more carefully.
Quantitative assessment of oil that is produced by water injection and by capillary forces was made. As a
result of researches, conclusions were made that additional attention to capillary forces primary must be
made than water injection at forth stage of development.
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