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EAGE Winter Symposium - Reservoir Geophysics, the Road Ahead
- Conference date: 27 Oct 1996 - 30 Oct 1996
- Location: Venice Lido, Italy
- ISBN: 978-94-6282-124-8
- Published: 27 October 1996
21 - 33 of 33 results
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Stochastic Inversion
Authors H. W. J. Debeye, E. Sabbah and P. M. van der MadeIn addition to traditional modeIs, geostatistics offers a variety of methods to build a stochastic model of the reservoir. Geostatistics offers interpolation techniques that account for the spatial relationship of variables. Some advantages of stochastic modelling are: • The impact of uncertainty on the models can be assessed. • Spatial heterogeneity as described by distributions, variograms and cross-variograms is modelled statistically correct. • Complex information can be incorporated. The basics of geostatistics are described by Journel et al (1978). Geostatistical algorithms are outlined by Deutsch et al (1992).
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Dealing with the Geoscientific Scaling Problem - an Object-Oriented Approach
Authors P. F. M. de Groot and A. H. BrilUp- and downsealing of geoscientific information represents one of the major challenges in characterising reservoirs. The sealing problem originates from the fact that various types of data and knowledge becomes available during the life cycle of a field. Information with widely varying scales and accuracies is gathered from 0 to 4 dimensions (e.g. core-plug, well log, 2D seismic line, 3D seismic volume, time-lapse seismic). All available information needs to he integrated in order to arrive at consistent resulls on which economic decisions can be made with confidence.
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Conditioning a Stochastic Model of Fluvial Channel Reservoirs Using Seismic and Well Data
Authors J. I. Berg, A. MacDonald, G. Johnsen and R. HaugeFluvial reservoirs are highly heterogeneous and comprise a complex network of channel-like bodies. To optimise the development of these reservoirs it is important to model the channel distribution between well observations in a realistic manner, and stochastic modelling techniques are becoming increasingly applied for this purpose. This paper presents a stochtastic method where seismic data are used to constrain the modelled spatial distribution of channels between wells.
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The Seismic Contribution to Reservoir Characterization
By S. J. PharezThere are many attributes now available to help characterise hydrocarbon reservoirs. Typically these attributes can be examined in three main groups - first those pertaining to the geometrical relationship of the reservoir; second the reservoir content, for example, lithology, fluid and petrophysics; and finally attributes which change with time over the life of the reservoir (figure 1). This paper will examine these groupings and the contribution that seismic data can offer in quantifying the attributes. The issues faced in integrating this wide variety of attributes will also be explored.
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3D Seismic Volume Interpretation for Reservoir Characterization - a Nigerian Field Case Study
More LessDetailed understanding of the reservoir properties and hydrocarbon distribution pattern within a Nigerian field complex has been one of the main uncertainties affecting the development. To help in this aspect, 3D visualisation and seismic attribute work was carried out as part of an integrated study.
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The Integrated Approach to Reservoir Evaluation - Myths and Realities
More LessThere is general consensus among oil and service companies that total integration of all available data by a multi-disciplinary team is a more cost effective and productive method of reservoir evaluation than the conventional isolated piecemeal approach. To this end, multi-disciplinary teams formed to work on specific fields are a common occurrence. These teams are composed of individuals that not only belong to different disciplines but also to different cultures.
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Enhanced Subsurface Geological Modelling Through Integration of Dipmeter Structural and Surface Seismic Data
Authors G. Maletti and P. BiffiThe integration between dipmeter structural data and seismics has proven to be a powerful tooI for enhancing the subsurface geological model in mature or partially explored areas. By using "stick plots" (projection of dips on avertical plane) the integration between these two types of data is made possible, and two objectives are achieved: improvement of the structural interpretation of dipmeter and seismics data, and the quality assessment of the processed seismic data. Two are the main steps for dipmeter to seismics integration: - dipmeter results filtering and reduction - projection of selected dips on the seismic line
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The Effects of Attenuation and Dispersion on Log Calibration and Wavelet Estimation
Authors J. P. Neep, M. H. Worthington and R. E. WhiteMany modern interpretation techniques in the general subject area known as seismic lithology are critically dependent on the quality of the tie between the surface seismic data and weIl data and the consequent estimation of the seismic wavelet.
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Reservoir Characterization by Using Permanent Downhole Geophones in 4D Seismic and Micro-Seismic Monitoring Applications
Authors J. -P. Deflandre, J. Laurent, S. Serbutoviez, F. Huguet and F. VerdierTwo types of Permanent Downhole Geophones (PDG) [1,2] have been developed for use in a permanent way (several years) in oil or gas wells. These geophones were designed to be installed between the casing and the tubing (Figure 1) or, if needed, behind the casing of new wells. They can be adapted to different well completions. PDGs are suitable for two types of applications: 4D seismic measurements and microseismic monitoring.
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Prestack Depth Migration by 3D Tomographic Inversion of Reflected and Refracted Arrivals
Authors A. Vesnaver, H. Biaolong, G. Böhm, G. Madrussani, S. Petersen and G. RossiReflection tomography produces reliable macro-models in depth for the velocity field of seismic waves and other geophysical properties, when complex 3-D structures are present. The well-known inversion ambiguities due to the null space can be avoided by fitting the grid to the distribution of the available ray paths.
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Reservoir Description Using Acoustic Impedance - Hallettsville 3D
More LessA seismic reservoir prediction methodology generated seismic porosity measurements after conversion of migrated seismic traces to acoustic impedance.
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