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71st EAGE Conference and Exhibition incorporating SPE EUROPEC 2009
- Conference date: 08 Jun 2009 - 11 Jun 2009
- Location: Amsterdam, Netherlands
- ISBN: 978-90-73781-67-2
- Published: 08 June 2009
151 - 200 of 585 results
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Joint Interpretation of Magnetotelluric and Seismic Models for Exploration of the Gross Schoenebeck Geothermal Site
More LessGeophysical exploration for geothermal resources is often challenging because information on the parameters of interest such as porosity, permeability, fluid content, etc., cannot be observed directly. Conventional (seismic) structure images are usually n
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Tectonic Heat Flow during the Permo-carboniferous Orogenic Collapse – Constraints by Tectonic and Maturity Trend Analysis
Authors D. D. P. Bonte, J. D. van Wees, S. Nelskamp, H. Verweij and M. Souto-CarneiroBasement heat flow is one of the most influential parameters on basin maturity. Although rapid progress has been made in the development of tectonic models capable of modeling the thermal consequences of basin formation, these models are used in basin mod
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A Regularization Workflow for the Processing of Cross-spread COV Data
Authors G. Poole, P. Herrmann, E. Angerer and S. PerrierData regularization is critical for the suppression of Kirchhoff migration noise and the production of a clean migration image. We introduce a workflow utilizing Fourier reconstruction in two spatial dimensions to fully regularize cross-spread COV data i
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Sampling Considerations for Band-limited Fourier Reconstruction of Aliased Seismic Data
Authors M. Naghizadeh and M. SacchiThe multidimensional discrete sampling theory is investigated from the interpolation point of view. We define a sampling operator and its associated wavenumber signature, the scaling function, and investigate sampling conditions for optimal band-limited F
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Method of Expansion of Seismic Fields with Use of Discrete Wavelet Decomposition
Authors O. M. Sagaidachnya and K. A. DunaevaMethodology of seismic data processing with use of wavelet filtration based on discrete wavelet decomposition is proposed. Seismic signal is decomposed with discrete wavelet transformation on detailed layers. Level n detailed layer is formed as a signal r
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Spectral Decomposition of Seismic Data with Pseudo Margenau-Hill Distribution
More LessSpectral decomposition of seismic data aims to characterize the time-dependent frequency response of subsurface rocks and reservoirs. The Wigner-Ville distribution, the short time Fourier transform spectrogram and the smoothed-pseudo Wigner-Ville distribu
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Residual Moveout Analysis and Velocity Determination for Finite Offset Measurements
More LessFor the case that a prestack depth migration has been performed with inaccurate velocities, an approach to predict the residual moveout after prestack depth migration is extended for larger offset measurements. With regard to the correction of the migrate
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Sensitivity of Velocity-less Imaging Using Horizontal Slownesses in 3D
More LessWe consider signal propagation in one layer with a constant velocity-gradient: layer in which the signal velocity increases linearly with depth. We use the traveltime and the four derivatives of the traveltime with respect to the locations of the source a
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Overburden Heterogeneity Effects in Migration Velocity Analysis – A Case Study in an Offshore Australian Field
Authors M. T. Takanashi, M. F. Fujimoto and D. ChagalovSeismic velocity has been used for reducing uncertainty of time-to-depth conversion. In the offshore Australian study field, there is a problem in the RMS velocity provided by Kirchhoff PSTM. The velocity pattern dominates NE-SW directed undulated pattern
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Non-grounded Surface Electroprospecting Technique
Authors O. I. Ingerov, L. Fox, A. Golyashov, I. Ingerov and A. ColinThe oldest MT technique (MVP) has been given new life with the fifth-generation of multifunctional equipment and precision tripods for magnetic sensor installation. The relatively recent many-3H technique brings new advantages to electroprospecting work i
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Technique and Application of the Time-frequency Electromagnetic Method
Authors W. B. Dong, Z. X. He, Z. Huang, J. C. Qin and W. F. LuoThis paper describes the time-frequency electromagnetic method (TFEM) and its application in western China. The TFEM method combines frequency-domain sounding with time-domain sounding to form a comprehensive system so that it is possible to select differ
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Power Line Noise Removal Techniques for Transient Electromagnetic Data
Authors V. A. Nockles, D. Wright and A. ZiolkowskiPower line noise falls within the bandwidth of multi-transient electromagnetic signals and dominates all other noise sources for land acquisition data. We present the results of applying three power line noise removal techniques: spectrum interpolation, h
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Nonlinear Seismic Technology – Complex of Various Nonlinear Seismic Properties of Medium for Reservoirs Investigation
Authors A. P. Zhukov, K. I. Loginov and M. B. ShneersonA new system of methods to identify and delineate hydrocarbon structures by analyzing different non-linear seismic effects has been developed. In contrast to traditional seismic methods this methods uses non-linear model of the media which takes into acco
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Physical Modelling of the Virtual Source Method
Authors B. M. Hartley, A. Palermo and B. J. EvansPhysical modelling of the virtual source method has been carried out to demonstrate its imaging capability below multi-scattering surface layer. The imaging has been compared with physical modelling of a conventional seismic experiment with source and re
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Feasibility of Borehole Radar Measurements to Monitor Water/Steam Fronts in EOR Applications
Authors M. Miorali, E. C. Slob and R. J. ArtsA technique capable of capturing the dynamic of the reservoir fluids in the proximity of production wells would provide enormous benefit to the reservoir management; in fact, monitoring can be used to develop a feedback loop between measurements and contr
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Simultaneous Joint Inversion of MMT and Seismic Data for Sub-basalt Exploration on the Atlantic Margin, Norway
Authors M. Virgilio, L. Masnaghetti, M. Clementi and M. D. WattsWesternGeco recently acquired marine magnetotelluric (MMT) data along a long (170 km) line where it had previously acquired 2D seismic data in 1993. In this presentation, we use simultaneous joint inversion (SJI) with seismic and MMT data to produce a su
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Trident – A New Satellite Gravity Model for the Oceans
Authors J. D. Fairhead, S. E. Williams, K. M. U. Fletcher, C. M. Green and K. VincentThis contribution has two aims – to discuss the resolution of currently available gravity solutions for the world’s oceans derived from satellite altimetry, and to present a new gravity solution that has superior resolution to these solutions. We use comp
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The Methodology of Oil and Gas Deposits Prognosis by Space and Geophysical Data
Authors B. S. Busygin, S. L. Nikulin and V. K. SvistunThe methodology allowing to carry out the preliminary evaluation of Earth space with the purpose of gas and oil deposits detection is described in this article. Small-scale observations of gravitational and magnetic fields as well as radar satellite image
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Study of Mahalat Fault Using Combined Sounding-profiling Apparent Resistivity Method
Authors M. Mirzaei, F. Ghadimi Arousmahlleh, F. Mina Araghi and M. Mina AraghiResistivity sounding is the most common technique used to investigate changes of resistivities in the vertical and horizontal direction we used resistivity profiling to study horizontal variations which can be sometimes interpreted as effect of fractures
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Geological Data Management in Murzuq and Kufra Basins, Onshore Libya – Cores Knowledge Management
Authors J. Dessay, J. M. Gonzalez Muñoz, A. Nassef and J. Suarez AlbaRepsol Exploration Murzuq S.A. (REMSA) is one of the largest foreign operators in Libya (GSPLAJ). At mid of 2005 REMSA started an ambitious exploratory program in Murzuq Basin and quite recently drilled several exploratory wells in Kufra Basin. Data ac
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3D Rapid Gravity Stripping Inversion and Its Application
Authors Y. X. Liu, H. L. Si, Y. X. Lu and W. J. ZhaoThis paper presents a rapid 3D gravity inversion based on a standard geometric frame and layer-separation technique of gravity anomaly. The inversion is constrained by anomaly grade and standard geometric frame is adopted in forward modeling of gravity an
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Applications of Scattered Interpolation with Multilevel B-splines to Magnetic Measuring Anomaly
More LessDue to terrain condition, plenty of observations are performed at anomalistic and scattered grid during geophysical exploration. To derive more rational and correct interpretation about geophysics anomaly, it is necessary to interpolate in the even and de
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Revealing Perspective Sites by Gravity and Magnetic Data
More LessThe original technique of mapping of HC lodes is developed on the basis of quantitative inter-pretation of gravitational and magnetic fields. It essentially differs from existing techniques: first, re-sult are a quantitative estimation of meanings of loca
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Fluid Filled Fractures Effect through Finite Difference Modeling in Kashagan Field
Authors M. Ferla, C. D‘Agosto and P. CibinThe objective of this study is to measure the seismic response in fractures filled with bitumen and oil. The main goal is to understand if the bitumen filled fractures act as open or close cracks through the S-wave splitting. We also investigate the possi
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Unsupervised Seismic Facies Analysis Using Continues Wavelet Transform and Self-organizing Maps
Authors M. R. Vasheghani Farrahani, S. Hadiloo, H. R. Siahkoohi and A. EdalatUnsupervised seismic facies analysis provides an effective way to estimate reservoir properties. Independent of the adopted methodology to perform the seismic facies analysis, the geological oriented spatial and temporal segmentation of the reservoir regi
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Carbonate Reservoir Porosity Estimation Using Multi-regression Method
Authors A. Almoqbel and Y. WangIdentifying the reservoir porous zones can be used as an indicator to reservoir fluids (Pennington, 2001). Porosity is crucial for determining the volumetrics of groundwater and hydrocarbon reservoirs. Moreover, porosity is usually related to permeability
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Zechstein Sparse Spike (Jason) Inversion for the Detection of Potential Drilling Hazards
Authors N. Yilo, J. Verbeek, A. Van Bruggen, R. Spaendonck, G. Lortzer, H. Ligtenberg and I. GolliferThe area of interest is a mature Rotliegend gas field located in the Southern North Sea, where additional infill and/or appraisal drilling is frequently required. The goal of this inversion project was to identify the main drilling hazards in the Zechstei
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Coherence-derived Volumetric Curvature Using the Windowed Fourier Transform
More LessVolumetric curvature analysis can provide insight into structure and fracture orientation and regional stresses. The Window Fourier Transform (WFT) is a very popular tool for time-frequency decomposition. In this paper, a new computation approach for volu
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A Practical Approach for Fluid Discrimination in Thin Soft Sand
More LessWe propose a practical approach to fluid discrimination using well-calibrated seismic data. The analysis uses seismic intercept and gradient data and is carried out in the EEI (Extended Elastic Impedance) domain. Well log data are used for calibrating the
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Direct Hydrocarbon Detection Using a HOS Based Wavelet Extraction Method
More LessDirect hydrocarbon detection has been a hot topic in exploration geophysics. And many methods have been proposed using seismic data, such as the bright spot analysis, AVO/AVA analysis, and P-wave/S-wave comparison. Recently, there are some noticeable dev
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Genetic Inversion for Reservoir Modeling in the Shtokman Field, Offshore Northern Russia
Authors A. Y. Barkov, Y. P. Ampilov, I. Yakovlev, I. I. Priezzhev, L. E. Shmaryan and P. C. H. VeekenA semi-automated 3D genetic inversion is used for reservoir property prediction in the Shtokman field. Basic input requirements for the workflow are a post-stack seismic cube and relevant logs at some control wells. A non-linear neural network operator is
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A Study of Seismic Velocities and Differential Pressure Dependence in a Middle East Carbonate Reservoir
More LessChanges in properties of carbonate reservoirs are not well understood from seismic signature due to the complex relations between reservoir properties and seismic velocities. Having a firm understanding of the relations between reservoir properties and ve
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Integrated Rock Physics Models for Improved 4D Seismic Monitoring of CO2 Sequestration in Otway Basin, Australia
Authors D. Makarynska, P. S. Wisman, M. Urosevic and T. DanceWe build a detailed rock physics model that links the rock and fluid properties with seismic properties and accounts for variations in reservoir quality, fluid saturations, and seismic resolution. This approach will increase the accuracy of the predicted
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Finite-difference Numerical Experiments and Laboratory Testing of Attenuation and Dispersion in Patchy-saturated Media
Authors V. Shulakova, M. Pervukhina, T. M. Müller, M. Lebedev and B. GurevichAccurate numerical modeling tools are of practical importance for understanding of seismic wave propagation in reservoir rocks. 2D finite-difference (FD) poroelastic code is used for simulation of acoustic wave propagation through water saturated medium w
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On Choice of Seismic Parameters to Use in Estimation of Porosity, Lithology and Pore Fluid
Authors E. H. Jensen and T. A. JohansenResults from estimation of porosity, lithology and pore fluid can depend on choice of seismic properties. We propose a method for evaluating combinations of seismic properties and find which one leads to the narrowest solution ranges and most stable solut
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Nonlinear Petrophysical Inversion with Mixture Density Neural Networks
Authors M. S. Shahraeeni and A. CurtisWe extend mixture density neural networks to estimate the a posteriori joint probability density function (PDF) of model parameters in a multi-dimensional inverse problem. We applied this neural network to estimate a posteriori joint PDF of clay content a
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Conceptual Modelling of Fluid-rock Interaction Effects on Elastic Properties in Carbonate Rocks
Authors R. Agersborg, T. A. Johansen and M. JakobsenThe elastic moduli of carbonate rocks are mainly affected by the fluid content in the rock, mineralogy, porosity and pore types i.e. shapes and sizes. Carbonate minerals can have a high chemical potential and may under fluid substitution react with the in
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Estimation of Stress Induced Azimuthal Anisotropy – AVO Modeling
Authors M. Brajanovski, B. Gurevich, T. Lokajicek, D. Nadri, A. Bona and G. DuncanThe analysis of rock anisotropy in terms of seismic velocities and within the context of rock-physics (Biot-Gassmann theory of poroelasticity) provides important information for the evaluation of the stress state (tensors) of rocks, detection of the direc
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Effects of Fluid Viscosity on P- and PS-waves in Fractured Rock
Authors Z. Qian, M. Chapman and X. LiWe studied the effects of fluid viscosity, seismic frequency, angle of incidence and fracture density on the seismic anisotropy from a fluid saturated HTI medium by numerical modelling. It demonstrated the relevance of Thomsen anisotropy parameters, seism
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Optimizing 3-D Modelling Strategies of Shoreface Reservoirs Using Outcrop Data
Authors A. Moscariello, P. Davies, H. Williams and S. A. J. PattisonThe study was aimed at defining the best modelling strategy for the creation of realistic reservoir architecture in sub-surface models of wave-dominated shoreface deposits. To achieve this goal, a fully-deterministic 3-D model was first created which ex
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Integrating Seismic with Borehole Imaging – Understanding the Depositional Setting in Krishna-Godavari Basin, India
Authors R. K. Mallick, C. Shrivastva, S. Ganguly and S. DubeyDeciphering the architectural elements of a clastic reservoir system becomes very important since the geological facies models and petrophysical models need to honour the subsurface geology for static modeling. An attempt has been made to understand the s
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Borehole Image Logs for Turbiditics Facies Identification
More LessIn deep offshore exploration, the need for reservoir improved knowledge is enhanced by various considerations: the general fast-track discoveries evaluation processes, the lack of nearby outcrops calibration and the relatively higher heterogeneity/complex
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Petrophysical Fracture Identification for Rock Physics Studies
More LessFractured carbonate reservoirs contain an important proportion of the world’s hydrocarbon reserves and a qualitative and/or quantitative description of the fracture system is fundamental to petrophysical evaluations. Formation Micro Imager (FMI) or Format
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Characteristic of Gas Hydrates Reservoir from Seismic Analysis of Multichannel Seismic Profiles Offshore South Chile
Authors I. Vargas Cordero, U. Tinivella, F. Accaino, M. F. Loreto, F. Fanucci and C. J. ReichertWe used a procedure already tested in order to characterize the gas hydrate and free gas reservoir along South Chile. We used the multichannel seismic data to obtain an accurate velocity model by using the Pre stack Depth Migration. The velocity model can
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A 3D Marine Seismic Data Reprocessing Brings Sharper Image to a Reservoir
Authors I. V. Yakovlev, A. Y. Barkov, Y. I. Stein, T. A. Grechishnikova and B. WebbIn this paper we present the results of the reprocessing and re-interpretation of 3D seismic data on a gas field in the Russian Arctic offshore. This data was acquired and processed in 2004 for the first time. Recently a decision has been made to reproces
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Application of Spectral Decomposition Seismic Attribute for Identification Geological Characteristics
Authors H. Hassani, M. R. Saadati Nejad, M. M. Khorasani, A. Javaherian and M. R. SokootiSeismic interpretation in principal tries to find any small changes, as subtle stratigraphic plays and areas of low-relief faulting. Looking at the amplitude of reflections at particular frequencies may be helpful to see more clearly features which may no
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Use of 3D Seismic to Predict Mining and Geological Conditions for Extracting Coal Beds in the Donets Coal Basin
Authors M. G. Tirkel, V. A. Antsiferov and A. I. KompanetsA case study of integrated geologic and geophysical interpretation of 3D seismic data at coal mine is given. Experience of investigation of thin coal beds by surface-reflected waves is considered. A more reliable, in comparison with previous investigation
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4D Amplitude Significance – A Technique for Suppressing Noise in 4D Seismic Surveys
Authors N. Philip, M. Dyce and D. WhitcombeWhen analysing 4D seismic data, a key objective is to separate true 4D signal from noise in order to better understand which parts of the 4D response can be used to map regions of production-related change. We introduce a new technique called "4D Amplitu
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Processing of Land 4D Seismic Data in Case of Limited Area of Repeated Survey – A Case Study from Otway Basin, Australia
Authors V. Shulakova, R. Pevzner and M. UrosevicTime lapse 3D seismic is an important part of monitoring and verification program of the Otway Project – an Australian first demonstration of the deep geological storage of CO2 located on-shore in Victoria. From March, 2008 CO2-rich gas is being injected
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Repeatability of Land Time-lapse Seismic Surveys – Otway Project 2D Test Line Case Study
Authors R. Pevzner, V. Shulakova, A. Kepic, Y. Y. M. Al-Jabri and M. UrosevicFull range of 2D and 3D borehole and surface seismic methods are utilised for time-lapse surveys for monitoring of CO2 sequestration at Otway Basin pilot project site. Conducting land time-lapse surveys is challenging task because of typical variability o
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