How to convert pdf to word without software duration. Avo principles, processing and inversion crewes research report volume 18 2006 5 r. An ava crossplot muting algorithm is used to highlight parts of an image corresponding to a class iii, low impedance, avo sand. Prestack seismic inversion and amplitude versus angle ava techniques were used in for direct hydrocarbon identification dhi and to understand better the risk during hydrocarbon prospecting. This tutorial shows step by step to do finite element analysis fea using proe mechanica.
Modeling a character in 3ds max pdf, ebook file software. Petrofacies characterization using best combination of. This paper presents practical aspects of avo modeling with the goal of better understanding and more effectively using avo modeling in both. Starting with the basics of importing log and seismic data, this short avo analysis demo covers the classic steps for creating useful avo type displays. Introduction and overview henrik sandberg kin cheong sou automatic control lab, kth access specialized course graduate level ht 2010, period 1. The work is carried out at integ, geopic, ongc, dehradun, india. To evaluate the applicability of the avo analysis, it was conducted on synthetic data that were generated with an anticline model, and field data from the hydrocarbonbearing colony sand bed in canada. Pro e analysis tutorial pdf mech410520 proe wf4 structure analysis tutorial. By assuming a rock physics model linking the elastic properties to porosity and mineralogy, we conducted seismic forward modeling and avo attributes computation on a threelayer earth model with varying porosity, clay content, and formation thickness. So the information from traditional fluid substitution just at the well is limited. Avo analysis was conducted on hydrocarbonbearing structures by applying the crossplot and offsetcoordinate amplitude polynomial techniques. Note that the model result is a fairly good match to the offset stack.
Dba person or group responsible for the effective use of database technology in an organization or enterprise. Linearization of zoeppritz equations and practical. Also be aware that an entity represents a many of the actual thing, e. Avo forward modeling is done to estimate and analyze various avo derived attributes for the discrimination of hydrocarbon from background sand. This module has the tools for conditioning prestack seismic data to produce optimum attribute volumes, crossplotting and interpretation functions for locating avo anomalies, and avo modeling tools for calibration. Analysis of synthetic data from the anticline model. Avo modelling allows you to use well log data to understand the seismic response when different fluids are present within your reservoir. Contribution of integrating seismic coherency and avo attributes in delineating sand bars reservoirs, offshore nile delta, egypt, a case study. Recipient of many us commercial patents, including those on elastic modeling, reservoir characterization and horizontal drilling introduced the elastic impedance concept and invented a novel modeling and avo analysis method that is commercially licensed and applied to over 100 fields and exploration projects with outstanding success.
By continuing to use our website, you are agreeing to our privacy policy. This is referred to as a class 3 avo anomaly rutherford and. Prestack seismic inversion and amplitude versus angle modeling reduces the risk in hydrocarbon prospect evaluation. Software tutorial, modeling a character in 3ds max pdf, 3d software type ebook file by paul steed, learn how to model with primitives. Avo is a program used to analyze prestack seismic data for the purpose of evaluating and modeling amplitude versus offset anomalies. Avo, inversion and attributes in seismic interpretation. Atlantic ocean gulf of mexico north atlantic welllogging geophysical methods. Views expressed in paper are those of authors only. Estimation of fracture parameters from reflection seismic datapart i.
Prestack seismic inversion and amplitude versus angle. With these model based understandings, improved multiattribute interpretation processes can commence with avo crossplotting of seismic volumes. Data modeling by example a tutorial elephants, crocodiles and data warehouses page 7 09062012 02. The milton dobrin lecture april, 2010 brian russell hampsonrussell. Some data modeling methodologies also include the names of attributes but we will not use that convention here. Relationships different entities can be related to one another. Acknowledgements authors are thankful to ongc for permitting to publish the work as paper. When we crossplot v p v s ratio against pimpedance, the zone of low values of each. Interactive modeling for pwave avo as a function of porosity and clay content in shaly sandstone.
Pdf interactive modeling for pwave avo as a function of. In the case of amplitudevariationwithoffset avo crossplotting, the seismic attributes are derived from cdp data. It thus enhances reservoir characterization and reduces the risk in hydrocarbon exploration. Geosyn geosyn is a cost effective 1d and 2d modeling tool designed to be used by geoscientists who want to bring geology into seismic interpretation. Without leaving the petrel platform, petrel quantitative interpretation provides seamless seismic data conditioning, rock physics, fluid substitution, avoava analysis, and pre and poststack deterministic and stochastic inversion to predict lithology, pore fluid content, and seismic pore pressure modeling. In order to understand and predict the seismic response for different fluid type and lithologies prestack seismic inversion and ava modeling based on existing well logs information were performed. How to make avo analysis and avo attribute to detect top and base gas using hampson russell software.
The ability to generate 1d synthetics, do avo analysis and create 2d models is enhanced by the ability to edit and model the original log data allowing a better tie. The convolutional model parameter reflectivity wavelet. Effective avo crossplot modeling free download as pdf file. Examining avo crossplots with visualization tools christopher p. The theory and practical utilization of simplification of the original general expressions for the reflection of compression and shear waves at a boundary as a function of the densities and velocities of layers in contact are presented in this paper. In avo analysis, we often we consider the verticalcomponent amplitude as a measure of reflection coefficient, use approximate formulas for reflection amplitudes, or ignore bending ray paths when. Sparlin hampsonrussell, houston, texas amplitudeversus offset avo crossplotting is a widely employed avo analysis technique that has gained acceptance in the geophysical community over the past decade. The input data for this process consists of the following elements. Gas reservoir identification by seismic avo attributes on.
Ross paper free download abstract the ability to crossplot attributes from a 3d seismic volume permits a geophysicist to identify and high grade subsets of the 3d volume that warrant detailed inspection. Quantitative petrophysical avo error analysis in a layered. As these models can be used to predict the likelihood of a specific reservoir fluid oil or gas they form an important part of exploration and development projects. The authors provide an integrated methodology and practical tools for quantitative interpretation, uncertainty assessment, and characterization of subsurface. Modeling was performed using a castagna mudrock line relationship castagna et al. The ability to crossplot attributes from a 3d seismic volume permits a geophysicist to identify and high grade subsets of the 3d volume that warrant detailed inspection. An overview of avo and inversion figure 4 shows a crossplot of intercept versus offset around the gas sand zone of figure 3, where the topofgas zone pink, baseofgas zone yellow and subgas carbonate stringers blue have all been highlighted. An application to vincent oil field data demonstrates the effectiveness of the proposed workflow. Database modeling and design university of michigan. Introduction to model order reduction royal institute of. The original general expressions are highly nonlinear and presumed to defy physical insight. This method of seismic reflection data is widely used to infer the presence of hydrocarbons. Pwave density swave poissons ratio synthetic offset stack 14. Contribution of integrating seismic coherency and avo.
We used the akirichards equations to perform both forward modeling and data analysis, extracting the intercept and gradient. Effective avo crossplot modeling porosity logarithm. After calculating the avo attributes, appropriate pairs of these attributes are crossplotted so that the hydrocarbon and nonhydrocarbon facies cluster together for quick identification and interpretation. Conducting avo modeling is, by nature, an exercise of multidiscipline integration. Modeling modeling discretization reduced number of odes. Quantitative seismic interpretation demonstrates how rock physics can be applied to predict reservoir parameters, such as lithologies and pore fluids, from seismically derived attributes. Abstract not available bibtex entry for this abstract preferred format for this abstract see preferences. Poissons ratio is a function of vpvs ratio and will be discussed in the next chapter.
Amplitude analysis in the angle domain douglas gratwick1 abstract this paper discusses amplitude vs. For comparison,figure 3b is an interpreted avo ab crossplot for a class 3 avo response in the gulf of mexico ross, 2000. An introduction to models and probability concepts j. Avo is a comprehensive hampsonrussell module for prestack data conditioning, attribute computation and analysis. Lastly, bayesian inference with multivariate probability density function pdf of petrofacies is performed to predict petrofacies probability volumes in the seismic area.