N385 Workflows for Seismic Reservoir Characterisation

Course Facts

Course Code:
N385
Duration:
5 days
Type:
Classroom
CEU:
4.0 Continuing Education Units
PDH:
40 Professional Development Hours
Certificate:
Certificate Issued Upon Completion

Summary

This course provides participants with the skills to design and execute workflows to achieve optimum seismic reservoir characterisation results. The course covers seismic conditioning to enhance the seismic data and seismic inversion to make quantitive estimates of reservoir properties. Coloured inversion and a comprehensive review of AVO methods including extended elastic impedance are covered together with a review of seismic inversion methods including both conventional deterministic methods and the latest Bayesian probabilistic approaches. A working knowledge of the seismic method is assumed but the main topics, AVO and inversion, are covered from basics.

Duration and Training Method

This is a five-day classroom course using examples, computer exercises, and case studies and discussion.  Participants are required to bring along a PC laptop running Excel 2007 or higher with Solver and Data Analysis add-ons.

Participants will learn to:

  1. Construct coherent workflows to estimate reservoir properties and associated uncertainties by integrating seismic data with other data types.
  2. Apply seismic conditioning methods to maximise bandwidth and optimise correlation with reservoir properties.
  3. Analyse relationships between reservoir and elastic properties to determine what may be estimated from seismic data.
  4. Select the appropriate inversion algorithm for any given situation.
  5. Appreciate the importance of uncertainty quantification in seismic reservoir characterisation.
  6. Select appropriate methods to achieve the objectives based on an assessment of data quality and an analysis of rock properties and reservoir geometry.

1. Introduction

  • Overview and objectives

2. Coloured Inversion

  • Geological studies on bed thickness distributions
  • Frequency domain implications
  • Coloured inversion and blueing
  • Optimising wavelets
  • Frequency slice filtering
  • Well ties and wavelet estimation
  • Stratigraphic filtering
  • Other forms of attenuation - Q & ghosts

3. AVO - Reflectivity

  • AVO in the reflectivity domain; Zoeppritz equations and linearisations
  • Measuring AVO - limitations and uncertainties
  • Seismic conditioning for AVO
  • Intercept-gradient crossplots
  • AVO, moduli and anisotropy
  • Intercept-gradient coordinate rotations

4. AVO - Impedance

  • AVO in the impedance domain
  • Elastic and extended elastic impedance (EI & EEI)
  • AIGI crossplots
  • Choosing chi angles and the effect of gradient measurement errors
  • Rock-physics
  • Bayes theorem & exploration risking

5. Attributes maps

  • Spectral decomposition
  • Multi-attribute methods
  • Reflectivity and impedance tuning
  • Seismic net pay
  • Uncertainties & Limitations
  • Map calibration

6. Inversion

  • The objectives and limitations of seismic inversion
  • Integration and Uncertainty
  • Bayes theorem
  • Deterministic and probabilistic inversion
  • Sources of uncertainty
  • The inversion landscape

7. ODiSI

  • Principles and application of One Dimensional Stochastic Inversion

8. Example Workflow

  • Coloured inversion
  • Chi angle selection
  • Seismic net pay
  • ODiSI

Who should attend

This course is designed for geoscientists who have been working with seismic data for at least five years and who wish to create coherent workflows to achieve specific quantitative objectives.

Prerequisites and linking courses

Participants need a working knowledge of seismic data processing and interpretation, wire-line logging and reservoir geology. Courses N085 (Introduction to Seismic Interpretation) and N004 (Rock Physics and Seismic Amplitude Interpretation) cover some of the required background.

Click on a name to learn more about the instructor

Patrick Connolly

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