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75th EAGE Conference & Exhibition incorporating SPE EUROPEC 2013
- Conference date: 10 Jun 2013 - 13 Jun 2013
- Location: London, UK
- ISBN: 978-90-73834-48-4
- Published: 10 June 2013
1101 - 1113 of 1113 results
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Geothermal Resources - Alternative Energy in Hydrocarbon Dominated Regions - An Assessment Study from the Alberta Basin
Authors S. Weides, I. Moeck, D. Schmitt, J. Majorowicz and E.P. ArdakaniForeland basins as the Alberta Basin in Canada host a variety of geoenergy resources. Often, the focus is on hydrocarbon resources but in times of discussions about climate change and environmental aspects, additional green energy resources are requested. This study explores Paleozoic formations in the north western Alberta Basin with regard to their usability as geothermal reservoirs. A 3D geological model is developed based on 177 km of 2D seismic data and stratigraphic picks of about 1000 wells from the Alberta general well data file. Seven siliciclastic and carbonate units form the major Paleozoic aquifer systems. Porosity and permeability of these Paleozoic formations is derived from data from about 10,000 core analyses and mapped with geostatistical methods. Formation temperature of Paleozoic strata is estimated by a newly calculated geothermal gradient and the reservoir depth range derived from the 3D model. The siliciclastic Granite Wash unit is presumable the most potential horizon suitable for geothermal development. Its temperature is above 70 °C, effective porosity is estimated with 10 % to 15 %. A possible application for the production of geothermal heat is the provision of warm water for in-situ oil sands extraction in this region reducing climate gas emissions.
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Fracture Trends and Disposition of Hydrocarbon Pools in India
By S. DandamudiFracture trends plays a major role in the disposition of the hydrocarbon pools in an hydrocarbon basin. Through this study we have analyzed the fracture trends of the different reservoirs in a basin with the help of the major structural features and with the help of the major oil pools present in it. Natural fractures which are formed as a result of the various tectonic and due to the stress variations in subsurface affects the hydrocarbon pools and the migration of hydrocarbons in one or the other way directly or indirectly. This study presents the relation between these hydrocarbon pools and their relation with the fracture trends. This study is mainly carried out with the help of the available data from the few major hydrocarbon basins of India. Many interesting results were found during the study and they were explained in the paper in detailed manner. These fracture trends are very much important for the identification of hydrocarbon pools in a basin in a reservoir of same age. And it was also found that the fracture trend varies with time and they are independent of age.
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Organic Matter Characteristics and Depositional Environments of Late Cretaceous Sediments in the Chad Basin, NE Nigeria.
Authors A.K. Adegoke and W.H. AbdullahOrganic and inorganic geochemical analyses and organic petrography of selected samples from various stratigraphic units penetrated by five exploratory wells (Kemar-1, Kinarsar-1, Kanadi-1, Ziye and Tuma-1) in Chad (Borno) Basin indicate that they are generally lean organically, and they are dominated by Type III and Type IV kerogen (Figure 1). Though, fair to good potential for gas generation exist in some parts of the basins, especially where the samples show high Total Organic Carbon (TOC), extractable organic matter (EOM) and hydrocarbon yield. The organic matter was deposited in marine environment, with substantial terrestrial input in anoxic-oxic depositional condition. This probably accounted for the poor preservation of the organic matter and the variable environment of deposition. Various maturity data (Vitrinite reflectance, Rock-Eval Tmax, Production Index, Bitumen/TOC ratio and biomarker distributions) suggested that the sediments, especially the lower part of the Fika Formation and the Gongila Formation, which composed majorly of shales and carbonates, have reached the early to peak stages of hydrocarbon generation. This study has further validated the previous studies on this basin, which reported that a potential for gas generation exists within the Chad (Borno) Basin.
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East Pre-Caspian Upper Permian and Lower Triassic Hydrocarbon Potential
Authors G. Akhmetzhanova and A.T. AltaiMore than 200 line km. of old and 450 line km. of new seismic data, well data of shallow core drill wells were analyzed. Described main groups of reflections on the seismic sections, corresponding to three main complexes of the geological succession of the East Pre-Caspian. Seismic and drilling data have demonstrated complex geological features of East Pre-Caspian in terms of lithology and facies variation, presence of sealing capacity, erosion surfaces and wide distribution of salt bodies. Structural and conceptual Geological model of Lower Triassic and Upper Permian succession made with the aim to describe geological settings of the area, preliminary HC reserves estimate and to assist in planning further field development.
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Sustainable Development and Petroleum Industry - The Part and Parcel
Authors R. Kumar, A. Chaudhary and A. Palh suitably balances the social, economic and environmental parameters. According to the World commission on environment and development Sustainable development is the “Development that meets the need of the present without compromising the ability of future generation to meet their own needs”. Economic and social are the important mainstays of sustainable development which requires the continuous supply of ample and economical energy.During switching our priorities from conventional to other sources of energy, the petroleum industry has played a critical role for managing its operation safely and in environmentally concerned ways.The development of oil and gas industry in the last century has resulted in maintaining environmental quality, social justice and economic prosperity. But this is not enough, Uninterrupted corporate commitment, enforcing proper government policies and public support is needed for overcoming the environmental challenges like Pollution control, biodiversity and global climate change in coming times.
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Integrated Analysis of Sub Basaltic Stratigraphy for Hydrocarbon Exploration
By S. DandamudiSub basalts are the flood basalts which were formed as a result of magma flooding. These sub basalts were initially treated as basement rocks in the hydrocarbon basins and there was no attempt made to look for hydrocarbons beyond them. With the exploration of oil and gas in the seaward dipping reflectors in sub basalts in some of the basins has made the geologists and geophysicists to look for these hydrocarbons. Through this work we have made an attempt to evaluate these sub basalts with the help of the integrated geophysical and geological techniques. This work would give and idea of all the available techniques in the geophysics and geology which can be applied economically for the evaluation of hydrocarbon potential and for exploration of these hydrocarbons. Seismic which helps in understanding the subsurface cannot be efficiently applied in sub basaltic study due to high impedance and velocity density contrasts . So integrated methods like EM and MT techniques are required for evaluating the hydrocarbon potential under these flood basalts.
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Integrated Geochemical Methodologies Conducted in Pre-evaluation Procedures of Hydrocarbon Lead Zones
Authors L.E. Tonita, L.M. Matei, F.A. Negru and I. MarisGeochemical procedures offer valuable insights about contouring the spatial distribution of a lead zone and prioritizing further depth investigations suitable to be applied. Data interpretation of Rock-Eval and preliminary X-Ray Diffraction results was done for dysodile shale samples collected from Oligocene outcrops of Getic Depression interest area. All samples have high potential for generating hydrocarbons according TOC values above 1%. HI, S2/S3 and kerogen type determinations indicate the rock formation is prone to generate oil and gas. Low Tmax values cannot be considered as accurate given the fact that the samples were collected from outcrops subject to environmental surface conditions.
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Integral Model of Vertical Velocities Distribution in the Central Part of Dnieper-Donets Basin
Authors I. Ustenko, I. Zvir, G. Lisnyi and V. PetruniakIn order to build reliable seismic images, so to say to obtain the main result of seismic exploration work it is crucially important to determine distribution of seismic velocities in geological media. Special feature of anisotropic media, which can approximate most of geological media, is the incorrectness of determining vertical semi axes of ray velocity indicatrix based on onshore (and offshore) acquired seismic data. This is the reason for difficulties in interpretation of the velocity analysis results using onshore seismic data both for isotropic and anisotropic media. In order to provide more detailed understanding for distribution of seismic velocities in central, most prospective for petroleum exploration, part of Dnieper-Donets Basin (DDB) a velocity model incorporating well VSP and onshore seismic data was built.
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New Aspects of 3D Seismic Data Interpretation at the Southern Border of Dnieper-Donets Basin
Authors V. Petruniak, I. Ustenko and S. VyzhvaReinterpretation of 3D seismic data and formation properties at the Southern border of Dnieper-Donets Basin allowed to reveal new aspect of geological structure of the area, determine areas of petroleum leads and re-estimate formation properties of key productive horizons.
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Forward Modelling of Poststack and Prestack Seismic Data of Fluid- and Solid-filled Buntsandstein Reservoirs
More LessThe aim of this study is to calibrate synthetic seismic data to the real reservoir for a proposed seismic modelling and inversion studies. For this purpose, well tie was done by generating reflectivity series from log data in TWT, convolving it with Ricker wavelet. Optimal match was then explored by adapting the phase of the wavelet and correlating the resulting synthetic trace with neighbouring traces of the real data. Thus, synthetic post-stack seismic data was simulated using a convolution model in an iterative approach, extracting a wavelet from the seismic data. After a satisfactory calibration, forward prestack seismic modelling was applied to investigate the AVO response of different interfaces. Both the simulated post-stack and prestack models were then verified against real seismic data. Results show a perfect fit of synthetic-to-seismic calibration at WTR well. Good match between the petrophysical and the seismic attributes then implies that well data has been tied to the seismic data (lithologic units can be assigned to logs and seismic parameters at these wells). Therefore, further seismic modelling and inversion can be performed to study the acoustic response of the reservoir in-fills and extract the seismic attributes in this reservoir using these data sets.
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Interpretation of Seismic Data from Permian – Mesozoic Polish Basin in the Time and Frequency Domain
By A KwietniakThe aim of the project was to analyse the application of chosen seismic attributes and spectral decomposition for interpretation of under - Zechstein reflections on the seismic sections from the Golce region. The main objective of the work was thickness estimation of the thin, sandstone layer which lays within the Rotliegend formation. Mainly instantaneous and geometrical attributes which are available in OpendTect were used. Two approaches of spectral decomposition were applied: based on Fast Fourier Transform (FFT) and Contonous Wavelet Transform (CWT). FFT is the best choice for thickness estimation, but it is very sensitive to the length of the time window. CWT is independent of the time window and has good resolution for high and low frequencies, because the length of the window varies with time. The results of thickness estimation based on FFT were verified with the data from the well Golce-1. The estimated thickness matches nicely with the data from the well. Additionally, results of instantaneous frequency show some similarities with the results of spectral decomposition.
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Geological Model of Reservoir Based on Seismic Attributes and Ant Tracking Case Study - F3 Block, Offshore Netherlands
Authors L.S. Septian and A.I. MaulanaSeismic Attribute is one of the best quantitative tools for seismic characteristic of interest. Analysis of attributes has been integral to reflection seismic integration since around 1930 when geophysics started to pick traveltimes to coherent reflections on seismic field records. There are more than 50 distinct seimisc attributes calculated from seismic data and applied to the interpretation of geological structure, stratigraphy, and rock/pore fluid properties. Seismic attributes are a powerful aid to to seismic interpretation. They allow the geoscientist to visualise some of geological information such as faults and channels, recognize the depositional environment and etc. For extracting accurate information from seismic attributes, the input seismic data needs to be optimally processed. The main objectives of this paper is to showing some of seismic attributes for detecting geological event from a data set in Netherland offshore.
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Development of Initial Geological Model Verification Technique
Authors V. Tsybulskyi and P.M. KuzmenkoThe technique, which allows to consider the effect of the geological structure on the seismic wave field was developed. It was tested at Subbotina field within the Kerch shelf of the Black Sea. Computation methodic of common shot point synthetic seismograms in sequential complicated model of the geological media was used. The results of synthetic modeling showed high convergence with real data.
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