- Home
- Conferences
- Conference Proceedings
- Conferences
Saint Petersburg 2018
- Conference date: April 9-12, 2018
- Location: Saint Petersburg, Russia
- Published: 09 April 2018
81 - 100 of 230 results
-
-
The Impact of Well Selection on the Results of Petrophysical Modeling and Stochastic Seismic Inversion
Authors K. Kozlov, A. Radchenko, K. Filippova, I. Nizhegorodova and M. PodberezhnySummaryThis paper shows an example of the impact of the well selection on the reliability of the petrophysical model and further reservoir characterization at one of the fields in Western Siberia. The petrophysical model comprises a statistical description of modeled lithotypes in terms of elastic properties and is subsequently used for parameters selection for performing the pre-stack geostatistical seismic inversion. Hence, the errors and uncertainties in petrophysical model entail distortion and lead to an inaccurate result of seismic reservoir characterization.
The creation of a petrophysical model was done in two stages. At the first stage wells with a thick oil-saturated reservoir were used for modeling of elastic properties of rocks. Statistics on the water-saturated reservoir was obtained by fluid substitution of oil on water. Detailed analysis of well data showed that the reservoir properties of water-saturated formation differ from oil-saturated. In the second phase, in the petrophysical new wells were added, it significantly improved the results of the stochastic inversion. This fact emphasizes the need for a statistical description of all the lithotypes by well data when you create models for stochastic inversion.
-
-
-
Upper Cretaceous Siliceous Deposits - Potential Gas Resources Enlargement in Western Siberia
Authors S.E. Agalakov, A.I. Kudamanov, V.A. Marinov, N.V. Nassonova, O.V. Bakuev, O.A. Loznyuk and V.B. KhmelevskySummaryLithological features of non-traditional siliceous reservoirs of the Nizhneberezovskaja subsuite (Santonian, Campanian) are reviewed. Potential siliceous collector is represented by silicon deposits in varying degrees transformed (flasks, diatomite, tripoli radiolarites) and opoka clays. The best quality and capacity of the collectors are expected in the central and northwestern areas of the lowland, in the northeasterly direction crystallization of the flasks and deterioration of reservoir properties are observed. The most promising for the formation of hydrocarbon accumulations in siliceous reservoirs are regions with underlying gas deposits in the Cenomanian and Turonian as well as zones of anomalous heating and zones of expected generation of oil and gase in the pre-Quaternary time.
-
-
-
New Insights on the Crustal Structure of the Eastern Black Sea Basin From Long-offset Seismic Reflection Data
Authors V. Monteleone, T.A. Minshull and H. Marín MorenoSummaryEstimating the degree of lithospheric stretching, and identifying the distribution of crustal types, are important elements in oil and gas exploration activity, because this information is used for thermal modelling of hydrocarbon maturation. The Eastern Black Sea Basin (EBSB) is a frontier basin for hydrocarbon exploration, but the deep-water setting (∼2200 m) and the presence of a thick sedimentary sequence (∼10 km) limit conventional seismic imaging. The EBSB is considered to be partially underlain by oceanic crust, but the distribution of crustal types and the structures accommodating the stretching are still poorly known. We use long-offset reflection seismic data, acquired in 2011 by Geology Without Limits and ION GXT, to image key elements of rift-basin settings such as thinned continental crust, tilted fault-blocks, syn- and post-kinematic sequences, the top of the acoustic basement and Moho. We differentiate the basement by examining seismic reflectivity patterns as an indicator of crustal type. We interpret variations in basement morphology to indicate the presence of a continent-ocean transition of enigmatic nature. This information will be used to further investigate the nature and thickness of the crust and to provide insights into mechanisms of continental extension and rifting in back-arc settings.
-
-
-
Stochastic Geological Modeling Without Loss of Seismic Content
Authors Y. Agramakova, A. Glebov, A. Nikolaev, S. Iliin, M. Balagurov, A. Ostankov and V. VorobevSummaryThe report addresses the urgent problem of the use of seismic data for geological modeling. Very often, when constructing a geological model, all the contradictory elements of the seismogeological model are discarded due to their incomprehensibility without any analysis, which contradicts the main concept of seismic application - the interpolation of the properties of the medium in the inter-well space. A technique is proposed that can overcome the existing gap between the seismogeological model and the geological model. The main stages are 1) the construction of an a priori geological model based on the results of deterministic inversion, 2) the use of the obtained a priori model in calculating the multiple realizations of stochastic inversion with 3) the subsequent ranking according to a system of specially developed criteria. The application of this technology is illustrated by the example of one of the oil fields of Eastern Siberia.
-
-
-
Deep Structure and Tectonic Zonation of the Consolidated Crust of Russian Arctic
By A.S. EgorovSummaryDeep structure, tectonics and geodynamics of the Arctic are studied actively by geological surveys and scientific centers of Russia, Canada, USA, Norway, Denmark and other countries. Scientific conclusions on these problems are radically different due to the variety of the Earth’s crust and lithosphere structure models and geoteconics ideas applied. In the article the author has set the task to show the efficiency of the “zone-block model of the lithosphere deep structure” which provides the adequate description of the structural-substancional parameters and geodynamics of the consolidated crust of the Russian sector of the Eurasian and Amerasian basins of Arctic and adjusted regions.
-
-
-
Chemometrics as New Tools to Make Sense of Biomarker Data in Condensate Samples of Iranian Gas Field
Authors M.H. Saberi and Mr SeyydiSummaryThe 14 samples of gas condensate obtained from GC analysis to determine the conditions of source rock sedimentation environment, lithology of the source rock, the study of the thermal maturation Trend and the separation of the studied area from the viewpoint of the sedimentation environment were analyzed. Results of the hierarchical cluster analysis and principal component analysis on these parameters show the existence of three gas families (gas condensate) in the studied area, which are completely separated from each other in terms of location. Families with numbers I and III are located in the East and West of the Persian Gulf, respectively and Family II is between them. Organic matter source of These hydrocarbons are marine organic matter with some organic matter of continental source, with maturity at the end of the Oil window and early gas window.
Considering the biomarker’s interpretation of the diagrams and its adaptation to the results of HCA and PCA, the trend of changes is such that maturity increases from the Golshan Field to the Salman Field and the sedimentation environment in the southern Persian Gulf, Salman and Golshan (marine Carbonate) is different from its northern fields, Khayyam, Tabnak and Maddar (marine Shale).
-
-
-
Facial-Cyclostratigrapfic Model of the Berrias-Valangin Structure in Western Siberia (North-East of the Sredneobskaya Oil and Gas Province)
More LessSummaryIn this paper the structural features of berrias-valangin in the north-east of the Sredneobskaya oil and gas province of Western Siberia have been studied. These investigations are based on the detailed analysis of core from 59 wells with a total width of 1700 m involving 150 wells log data. As a result the facies-cyclostratigraphic model of the berrias-valangin structure has been developed. According to this model, 4 regional transgressive-regressive sedimentation cycles were appeared in the berrias-valanginian time. It should be noted, that the sea level rise at the beginning of the second cycle and corresponding drop by the end of I and IV cycles have an eustatic nature. The geological bodies - geoformations with a width of 60 to 220 m and hundreds kilometers long were formed as a result of four transgressive-regressive cycles of sea level fluctuations. Their distal part consist of deepwater shelf silty-pelites, in the middle part the psammites of sandbanks and deltas are dominating, and in the proximal part there are psammites of the bar and silty-pelites of lagoons. The obtained results allow us to justify the litological nature of the lower cretaceous clinoform complexes of Western Siberia. Their boundaries cross the isochronous level of the second cycle transgression maximum, which is have an eustatic nature. It is shown that the boundaries of the clinoform complexes are “sliding” along the edges of the differently aged sand lenses, creating in seismic sections a picture of the wedge-shaped bodies, inclined to the west.
-
-
-
Multi-scale, multi-modal digital rock imaging and analysis of tight rocks from the Bazhenov Formation
SummaryDescription of the complex structure and texture of Bazhenov formation rocks demands sophisticated analysis technologies. Three Bazhenov samples were investigated using a digital rock workflow for multi-scale, multi-modal, registered imaging and analysis. Use of selective X-ray attenuation contrast techniques enabled micro-CT imaging to separately highlight porosity and organic matter and also to distinguish mobile from immobile hydrocarbons in preserved samples. The correlations and textural relationships between pores, organic matter and mineral matter were further investigated using high resolution SEM imaging and SEM-EDS automated mineralogy. The rock samples comprised a large number of layers on all scales from macro to micro levels, each with a specific mineralogical composition and differing quantities of organic matter and porosity.
-
-
-
Shear waves, seismic attenuation and a more robust well calibration using zero-offset VSP. Examples from conventional and unconventionals reservoirs in Argentina
Authors T. Santana, E.L. Corti, D.L. Sanchez and F.G.E SpäthSummaryBorehole seismic is recorded by geophones or accelerometers placed on the borehole, then contain information about the reflection and transmission properties of the Earth, while surface seismic only include the recorded up going waves. Up going multiples in VSP do not outspread to the direct arrival curve. Consequently, corridor stacks can be described as a multiple free, zero phase, normal incidence response. Also, zero-offset P-wave VSP provides information about the seismic wave attenuation through Earth and shear components that may be generated by non-inelastic layers. Around 700 VSPs in Argentina were analysed, 15% of which have high potential to derive wave attenuation and shear data. The present study demonstrate the presence of shear waves in zero-offset P-wave VSP and proposes workflows to maximize the use of borehole seismic for a more robust seismic to well calibration to reduce uncertainties in seismic phase required for seismic interpretation, to estimate seismic wave attenuation and, extract shear components for processing and characterization projects. Shear waves from P-wave VSP can provide an actual low frequency Vs velocity model to 3D elastic inversion, and a Vp plus Vs model for microseismic surveys. Examples from conventional and unconventional reservoirs in Argentina are presented.
-
-
-
Assessment of Texture Descriptors for Seismic Image Retrieval and Salt Dome Detection
Authors E. Vital Brazil, R.S. Ferreira, A. Mattos, R.M. Gama e Silva, R. Cerqueira, M. Ferraz, J. Almeida and D.S. CersosimoSummaryMuch work has been done on the assessment of texture descriptors for image retrieval many domains. In the context of geoscience, the image retrieval has been applied to automatically identify important structures in a seismic cube, like salt domes and fault. In this work, we evaluate the accuracy and performance of four well-known texture descriptors – namely, Gabor Filters, Grey Level Co-occurrence Matrix (GLCM), Local Binary Patterns (LBP), and Histogram Features (HF) – for seismic image retrieval and salt dome detection. These subsurface images pose challenges yet not thoroughly investigated in previous works, which are addressed and evaluated in our experiments. We asked for domain experts to annotate two seismic cubes – Penobscot 3D and Netherlands F3 – and used them to evaluate texture descriptors, corresponding parameters, and similarity metrics with the potential to retrieve similar regions and detect salt domes in the considered datasets. While GLCM is used in the vast majority of works in geosciences, our findings indicate that LBP has the potential to produce satisfying results for seismic image retrieval with lower computational cost. By the same token, HF had a good impact in salt-dome detection.
-
-
-
Regional development study (North GOM, East Cameron-South)
Authors H.H. El-Husseiny, M.N. Abdelrahim and M.E. YamnySummaryDeveloping a certain field with long production history can be challenging, for you need to identify a huge number of the reservoir characteristics accurately. Analyzing the well logs and calculating the petrophysical parameters such as the shale volume and the effective porosity then using the distribution of the wells to create useful maps that can draw the best area for development with the help of well-placed seismic lines, always considered as a good tool. The purpose of our study is to create the best view on East Cameron concession, in order to reveal the development possibilities using the petrophysics and the pressure regime.
-
-
-
Artificial Intelligence as the Problem Solving Method of Unconventional Reservoir Simulation
Authors S.O. Ursegov, A.Z. Zakharian and E.N. TaraskinSummaryThe main challenge of unconventional reservoirs is to find out their high production zones (so-called “sweet spots”). For “sweet spots” mapping, there is information from wells, which are drilled only in a few points of a reservoir, and from seismic survey covering the entire reservoir area. During upscaling the well data for the whole reservoir, there is a problem how having a limited amount of information from a finite number of points (wells), turn it into an infinite number of polygon points (a reservoir). In this work, the new adaptive modeling approach for seeking “sweet spots” is proposed. The main difference of the adaptive approach from the deterministic one is that it does not connect the well and seismic data by rigid functions. The adaptive approach gives real forecasting of future performance not its calculation, because it is based on artificial intelligence in a form of fuzzy logic algorithms, which are able to form relatively free correlation between the well and seismic data. This work demonstrates the capabilities of the adaptive approach for a real unconventional reservoir in a carbonate formation with heavy oil to predict the location of the reservoir “sweet spots” for new drilling.
-
-
-
Application of Methods of Attribute and Seismic Facies Analysis in the Study of Carbonate Fractured Reservoirs of the Paleozoic Basement of Western Siberia
Authors A. Iskhakova and V. MerkulovSummaryIn this paper, methods for the complex interpretation of seismic data on the basis of attribute and seismic facies analyzes are considered that have shown their effectiveness in predicting the localization of zones with improved reservoir properties in fractured Paleozoic sediments
-
-
-
A Two Dimensional Basin and Petroleum System Modeling in Coastal Fars Area of South Zagros, Iran
Authors M.H. Saberi and T. AshrafiSummaryThis modelling study attempted to quantify the processes of hydrocarbon (HC) generation, expulsion and migration along a regional section (NW-SE) in the South Zagros Basin of Southern Iran. The studied area called “Coastal Fars” is one of the most prominent hydrocarbon areas in Iran but bears high exploration uncertainties caused by the complex structures, presence of multiple possible source layers and manifold migration pathways. Since 1970 increasing number of gas accumulations have been discovered in Permo-Triassic siliciclastic and carbonates in the Faraghan, Dalan, and Kangan formations in Iran coastal areas. Data gathered from five production wells were used for this study. Sarchahan Formation as a part of a widespread Paleozoic shelf system extending across northern Gondowana, is the main generating source rock in studied area which has been generated large amounts of oil and gas for various Paleozoic and Triassic stratigraphic units. Sarchahan reached maximum burial depth in Pleistocene which maximum burial depth is greater in eastern wells. Latest uplift in western portion of studied area started earlier than other parts. Greater burial depth caused greater volumes of hydrocarbon generation in eastern wells. Expulsion of Hydrocarbons happens almost simultaneously in all wells.
-
-
-
Geological Structure and Hydrocarbon Potential of Khatyr and Aleut Basins. Bering Sea
Authors E.V. Gretskaya, N.A. Petrovskaya and A.V. SavitskiySummaryThis paper considers the structure of sedimentary cover of the basins and identifies structural elements of different order. Three petroleum systems are described for Khatyr basin, which differ in their stratigraphic extension, structure and development. In Aleut basin, two potential oil and gas bearing systems confined to Koryak-Aleut and Navarin-Aleut troughs are identified. Presence of prospective features is predicted in Paleogene and Miocene deposits of the basins.
Wide spread of gas hydrates in Aleut basin confirmed by seismic data allows speaking of a potential gas hydrate bearing system here. The thickness of gas hydrate stability zone varies from 150 to 600 m.
-
-
-
Risk Factors Evaluation for Monitoring of Well Drilling
Authors A.S. Grigoriev, D.V. Konoshonkin, N.V. Bukhanov, O.T. Osmonalieva and B.V. BelozerovSummaryThe purpose of this work is to create a learning algorithm that, based on historical data about previously drilled wells, will classify drilling problem. Such decision support system will help the engineer to intervene in the drilling process and prevent high expenses due to unproductive time and equipment repair due to a problem.
In order to solve this task, the wells were found in which problems were encountered. Calculations have been made on various machine learning algorithms to identify an algorithm that yields a minimum error rate. As a result of the project, a model based on gradient boosting was developed to classify the problems in the drilling process.
-
-
-
About Prospects of Development of Small Deposits with Oil Rims on an Example of Deposit N in Perm Krai
Authors E.S. Klykova and S.V. MigunovaSummaryNowadays resours-saving is one of priority tasks of Russia’s economy.Oil leg reservoirs (oil rims) are important part of recourses, which can save of recourses base potential of the country. Attraction of assets of these recourses is actual for majority small and big oil companies for now. However, oil rims development has faced with some difficulties. It is necessary to understand features of these reservoirs development and choose rational system of development. Generalization of gained experience allows to find optimal decisions that aimed to achieve maximum recovery factor of oil from oil leg reservoirs.
-
-
-
Geochemistry of Ogranic Matter in Sedimentary Cover of Northern Part of West Siberia Basin
More LessSummaryResearch area covers the territory of Gydan and Yamal Peninsulas.
Recent geochemical studies on the research territory shows complex pattern of OM accumulation, as well as generation of hydrocarbons by it. Produced hydrocarbons subsequently filled the traps of the Yamal and Gydan. There are several source rock intervals in Jurassic sediments. It is thought that liquid hydrocarbons are mainly produced by bazhenov formation, while gaseous hydrocarbons could be produced both by thermogenic sources and by the bacterial activities.
-
-
-
Numerical Computation of Effective Elastic Parameters of Rock Samples by 2d and 3d Numerical Images
Authors G. Reshetova and T. HachkovaSummaryA parallel algorithm for evaluating the elastic properties of rock samples from 2D and 3D images of computed tomography is presented. The method is based on the principle of the equivalence of the strain energy, in which the static boundary conditions simulating a physical experiment are chosen as homogeneous ones and the components of the compliance tensor are determined. A special feature of the algorithm is a new scheme for solving problems of static loading of a sample by establishing the problem of dynamic elasticity theory and a parallel implementation scheme based on MPI + OpenMP. The results of numerical calculations are presented. The accuracy of determining the effective parameters was verified on homogeneous samples with known properties, and layered ones, for which the effective parameters were calculated using the Schoenberg method.
-
-
-
Noise Suppression in Reduction to Pole of Magnetic Data
Authors A. Kiss, M. Dobróka, D.O.B. Nuamah and J. Somogyi MolnárSummaryIn geophysical data processing, the noise suppression capability of the applied algorithm is a key characteristic. The often used Discrete Fourier Transformation has the disadvantage, that the noise registered in the time domain is directly transformed into the frequency domain. On the other hand there are robust methods to solve the overdetermined inverse problem with excellent noise rejection capabilities. In this paper, the Fourier transformation is solved as an inverse problem. The continuous frequency spectrum is discretized by series expansion. With the use of Hermit functions as basis function system, the algorithm will be faster. Due to the special feature of the Hermit functions - namely, that they are the eigenfunctions of the FT - the determination of Jacobian matrix does not require the calculation of complex integrals. The applicability of the method was proved on synthetic magnetic data set, where the Fourier transformation is used during the reduction to pole. The application of Iteratively Reweighted Least Squares (IRLS) algorithm using the so-called Cauchy-Steiner weights provides a robust and resistant method.
-