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Workflows for Seismic Reservoir Characterization

GeoLogica Limited
Course summary
32 hours
2,750 USD
English
Full time
Online courses
Next available date: 04/10/2021 - Online courses
Professional Training

Course description

Workflows for Seismic Reservoir Characterization

This course will provide participants with the skills needed to design and implement workflows for seismic reservoir characterization using established best-practice and emerging technology. The course covers seismic conditioning, colored inversion, AVO theory including elastic and extended elastic impedance, DHIs, seismic net pay, well ties, rock physics, and deterministic and probabilistic inversion including the application ODiSI.

Suitability - Who should attend?

Intended for practicing seismic interpreters. Participants should have a basic knowledge of the seismic method, including acquisition and processing, with a minimum of three years working with seismic data. However, the subject matter of this course, AVO and inversion, is covered from basic principles.

Outcome / Qualification etc.

  • Appreciate the benefits of colored inversion how and why it works and how to get the best results from a colored inversion application.
  • Understand the relationships between reflectivity and impedance, and between time and frequency.
  • Understand the model for AVO measurements and the difficulties in making accurate AVO measurements.
  • Understand the concepts behind AVO analysis, including intercept-gradient crossplots and the theoretical relationship between elastic and AVO properties.
  • Optimize AVO products for subsequent characterization work and create seismic products that correlate with specific reservoir properties.
  • Appreciate the risks of using attributes with no physical relationship with desired objective.
  • Appreciate the limitations of the seismic net pay method and to know when it is, and is not, applicable.
  • Understand the principles and pros and cons of deterministic and probabilistic inversion and how to select the appropriate inversion strategy for any given problem.

Training Course Content

Sessions 1 and 2 Introduction and colored inversion

  • Technical and learning objectives
  • Bed thickness distributions
  • Impedance and reflectivity spectra
  • Band-limited impedance and band-limited reflectivity
  • Colored inversion and blueing
  • Wavelet optimization, amplitude and phase spectra
  • Well ties and wavelet estimation
  • Frequency slice filtering and structurally conformable filtering
  • Stratigraphic filtering (O’Doherty-Anstey)
  • Q and ghosts

Exercises

  • 1-D geological modeling with different bed-thickness distributions
  • Fourier transforms
  • Wavelet modeling

Sessions 3 and 4 AVO measurement;

  • Zoeppritz equations and linearisations Aki and Richards, Wiggins and Shuey
  • Intercept, gradient and curvature
  • Background AVO trends
  • Angle stacks and angle estimation
  • Sources of measurement errors
  • Seismic conditioning scaling, spectral balancing etc.
  • 2-term and 3-term measurements
  • Maximum angle and truncation error
  • Anisotropy the Rüger equation
  • Fatti equation and 𝜆𝜌 𝜇𝜌

Exercises

  • Half-space modeling with the Wiggins equation
  • Modeling gradient measurement errors
  • 3-term curve fitting
  • Modeling the effects of VTI anisotropy

Sessions 5 AVO crossplots

  • Background trends on intercept-gradient crossplots
  • AVO classes
  • The effect of moveout errors on the AVO classes
  • Fluid substitution the Dong equation
  • Fluid changes on intercept-gradient crossplots
  • Intercept-gradient coordinate rotations
  • AVO properties and elastic properties
  • Elastic property reflectivity vectors
  • Theoretical chi relationships

Exercises

  • Modeling the structure of intercept-gradient crossplots
  • Modeling the effect of moveout errors on AVO measurements
  • Modeling the effects on AVO of fluid substitution and anisotropy

Session 6 - AVO analysis

  • Transforming AVO from reflectivity to impedance
  • Elastic impedance and extended elastic impedance (EEI)
  • AIGI crossplots
  • Empirical EEI correlations with reservoir properties
  • Non-zero offset and deviated well ties
  • AVO facies analysis
  • Optimized χ-angles from well log analysis
  • The effect of gradient errors and noise on χ-angles
  • Optimum χ-angles from seismic data
  • Rock physics modeling and rock physics templates
  • DHIs, Bayes theorem and exploration risking

Exercises

  • Modeling EEI correlations
  • Optimizing chi-angle stacks for different scenarios
  • Modeling a seismic optimization workflow
  • The effect of rock physics parameters on optimal χ-angle
  • Exploration risking using Bayes theorem

Session 7 Attribute maps

  • Importance of net-rock volume estimation
  • Spectral decomposition
  • Multi-attributes and the risks of spurious correlation
  • Binary systems and EEI
  • Band-limited impedance and reflectivity tuning
  • Detuning and calibration
  • The seismic net pay method
  • Application to unconventional shale plays
  • Lateral resolution and map calibration uncertainties

Exercises

  • Demonstration of spurious correlation from multi-attributes
  • Modeling how bandwidth affects tuning
  • Manual estimation of net pay from synthetic attributes

Session 8 Seismic inversion

  • Sources of inversion uncertainty
  • Facies probability curves
  • Bayes theorem for continuous random variables
  • Uncertainty quantification
  • Deterministic and probabilistic inversion
  • Inversion algorithms
  • Lateral correlation geostatistical inversion
  • The inversion landscape categorization
  • Comparison of inversion methods and algorithms

Exercises

  • Manual inversion
  • Deterministic gradient descent inversion
  • Estimating values with uncertainty

Course delivery details

  • 7am-11am CDT
  • Eight 4-hour interactive online sessions presented over 8 days (mornings in North America and afternoons in Europe). A digital manual and exercise materials will be distributed to participants before the course. Some reading and several exercises are to be completed by participants off-line.

About provider

Providing world-class training for the energy industry, GeoLogica is an experienced team with an extensive network of tutors and instructors on their books. Their expertise spans both subsurface training for the oil and gas industry, as well as training aimed...


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GeoLogica Limited

Oxford Point, 19 Oxford Road
BH8 8GS Bournemouth Dorset

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